Single transcript level atlas of oxytocin and the oxytocin receptor in the mouse brain

  1. Vitaly Ryu  Is a corresponding author
  2. Anisa Azatovna Gumerova
  3. Georgii Pevnev
  4. Funda Korkmaz
  5. Hasni Kannangara
  6. Liam Cullen
  7. Farhath Sultana
  8. Ronit Witztum
  9. Steven Lee Sims
  10. Tal Frolinger
  11. Ofer Moldavski
  12. Orly Barak
  13. Emily Weiss
  14. Jay J Cao
  15. Daria Lizneva
  16. Ki A Goosens
  17. Tony Yuen
  18. Mone Zaidi  Is a corresponding author
  1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, United States
  2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, United States
  3. United States Department of Agriculture, Grand Forks Human Nutrition Research Center, Grand Forks, ND 58203, United States

Abstract

Oxytocin (OXT), a primitive nonapeptide known to regulate reproduction and social behaviors, is synthesized primarily in the hypothalamus and is secreted via the hypophyseal-portal system of the posterior pituitary gland. In line with the premise that pituitary hormones, traditionally thought of as regulators of single targets, display an array of central and peripheral actions, we found that OXT directly affects bone and body composition. The effect of OXT on bone remodeling is physiologically relevant, as elevated OXT levels during pregnancy and lactation cause calcium mobilization from the maternal skeleton for intergenerational calcium transfer towards fetal bone mineralization. There is an equally large body of evidence that has established the presence of OXT receptors (OXTRs) in the brain through which central functions, such as social bonding, and peripheral functions, such as the regulation of body composition, are exerted. To purposefully address effects of OXT on the brain, we used RNAscope to map OXT and OXTR expression, at the single transcript level, in the whole female and male mouse brains. Identification of brain nuclei with the highest OXT and OXTR transcript density sheds further light on functional OXT nodes that could be further interrogated experimentally to define new physiologic circuitry.

Editor's evaluation

This study provides a valuable, transcript-level map of OXT neurons and OXTR expression across the mammalian brain using advanced single-molecule RNAscope. The authors present compelling evidence supporting their conclusions, combining chromogenic assays with high-quality, state-of-the-art microscopy. By clearly delineating oxt and oxtr expression across multiple nuclei and brain regions relevant to behavior and physiology, the work substantially advances understanding of central oxytocin signaling and will be of broad interest to neuroscientists and endocrinologists.

https://doi.org/10.7554/eLife.95215.sa0

Introduction

Oxytocin (OXT), a neuropeptide synthesized primarily by magnocellular neurons within the paraventricular (PVH) and supraoptic nuclei (SON) of the hypothalamus (Sofroniew, 1983; Swanson and Sawchenko, 1983; Landgraf and Neumann, 2004), has been broadly implicated in the control of parturition, lactation, appetite, emotions, stress responses, and social behavior. The distribution of OXT receptors (OXTRs) across the brain in different species provides a proxy for the distribution of OXT binding, thus providing evidence for OXT nodes in the brain of physiologic relevance. It has been reported that OXTRs are expressed in many brain sites, including the central nucleus of the amygdala and the ventromedial hypothalamic nucleus (VMH) (Bale and Dorsa, 1995b; Bale and Dorsa, 1995a). Furthermore, Oxtr mRNA has been detected in the hypothalamus, olfactory bulb, ventral pallidum, and the dorsal vagal nucleus (Yoshimura et al., 1993; Adan et al., 1995).

OXT mediates a variety of peripheral and central functions. While the peripheral actions comprise milk ejections, uterine contractions, and prolactin production, the central actions of OXT are mostly related to female reproduction, including sexual receptivity (Caldwell et al., 1986), pair bonding (Insel, 1992), and maternal behavior (Fahrbach et al., 1984; Pedersen et al., 1982; Insel, 1990). Central functions of OXT also include modulation of cardiac vagal input (Bohus et al., 1996), memory consolidation (Dyball and Paterson, 1983), and social/affiliative behavior (Insel, 1992; van Wimersma Greidanus and Maigret, 1996). Axons and dendrites of OXT neurons are localized in close proximity to the third ventricle and even in between tanycytes and ependymal cells facing the cerebrospinal fluid (Landgraf and Neumann, 2004). Notably, magnocellular OXT neurons send extended dendritic trees, forming the basis for the somato-dendritic release of OXT within the PVH and SON (Ludwig and Leng, 2006; Neumann et al., 1993; Neumann, 2007; Pow and Morris, 1989). Such release is likely to facilitate autocrine and/or paracrine regulation of OXT neurons towards physiologic demands, such as lactation (Moos and Richard, 1989; Neumann et al., 1994) and child birth (Neumann et al., 1996). To exert neuronal effects, locally released OXT binds to local OXTRs, which are expressed within or are juxtaposed to the target region, for example, on synapses, as well as on axons and glial processes (Mitre et al., 2016). Alternatively, OXT could putatively diffuse over longer distances to bind to adjacent OXTRs (Landgraf and Neumann, 2004; Ludwig and Leng, 2006; Mitre et al., 2016). Given that OXT exerts its multiple behavioral effects through its action on several regions of the forebrain and mesolimbic brain, the question of whether other extrahypothalamic projections of OXT neurons may also have a role garners significant importance.

It is also becoming increasingly clear that both anterior and posterior pituitary hormones, traditionally thought of as regulators of single physiological processes, affect multiple bodily systems, either directly or via actions on brain receptors (Zaidi et al., 2018; Abe et al., 2003). Nontraditional actions of OXT include its ability to affect the skeleton, wherein it stimulates bone formation by osteoblasts and modulates the function of bone-resorbing osteoclasts (Sun et al., 2019).

Despite a corpus of evidence for the expression of OXT and OXTRs in various brain regions, and their function in regulating central and peripheral actions, such as social behavior and satiety (Sun et al., 2019; Bale et al., 2001), there remains the need for a detailed, sex-specific mapping of the anatomical geography of the OXT and OXTR systems in the brain. Here, we use RNAscope—a cutting-edge technology that detects single RNA transcripts—to create a comprehensive sex-specific atlas of the OXT and OXTR in the mouse brain. We believe that this compendium of OXT and its receptor in concrete brain sites should provide a resource for investigators to study both peripheral and central effects of interrogating OXTRs site—specifically in health and disease. Our identification of brain nuclei with the highest OXT and OXTR transcript density will thus deepen our future understanding of the functional engagement of the central OXT-containing neuronal nodes within a large-scale functional network.

Results

Mapping autoradiographic studies suggest that the distribution of OXTRs in the brain varies greatly among different rodent species (Dubois-Dauphin et al., 1992; Elands et al., 1988; Insel et al., 1997; Tribollet et al., 1992). Besides mapping the full anatomical distribution of Oxt and Oxtr by RNAscope, the present study also assessed sex differences in Oxt and Oxtr distribution. Allowing the detection of single transcripts, RNAscope uses ~20 pairs of transcript-specific double Z-probes to hybridize 10-µm-thick whole-brain sections. Preamplifiers first hybridize to the ~28-bp binding site formed by each double Z-probe; amplifiers then bind to the multiple binding sites on each preamplifier; and finally, labeled probes containing a fluorescent molecule bind to multiple sites of each amplifier.

RNAscope data were quantified on sections from coded three female and three male mice. Each section was viewed and analyzed using CaseViewer 2.4 (3DHISTECH, Budapest, Hungary) and QuPath v.0.2.3 (University of Edinburgh, UK). The Atlas for the Mouse Brain in Stereotaxic Coordinates (Paxinos and Franklin, 2007) was used to identify every nucleus, sub-nucleus, or region, which was followed by manual counting of Oxt and Oxtr transcripts by two independent observers (VR and AG) in every tenth section using a tag feature. Receptor density was calculated by dividing the transcript number by the area (µm2, ImageJ) in every nucleus, sub-nucleus, or region. Photomicrographs were prepared using Photoshop CS5 (Adobe Systems) only to adjust brightness, contrast, and sharpness, and to remove artifacts (i.e., obscuring bubbles).

In males, we report the expression of the Oxtr in 359 mouse brain nuclei, sub-nuclei, and regions. Probe specificity was established by a positive signal in the epididymis with an absent signal in the liver (negative control) (Figure 1A). Notably, Oxtr transcripts were detected bilaterally, with no apparent ipsilateral domination. Transcript density was highest in ventricular regions, followed, in descending order, by the hypothalamus, olfactory bulb, hippocampus, cerebral cortex, medulla, midbrain and pons, forebrain, thalamus, and cerebellum (Figure 1B). Using the RNAscope dataset, we further calculated Oxtr density in various brain nuclei, sub-nuclei, and regions. High Oxtr transcript densities and counts, respectively, were also noted in several nuclei, sub-nuclei, and regions as follows (Figure 1C): ventricular regions—ependyma of the OV and 3V; hypothalamus—AHiPM for both; olfactory bulb—vn and GrO; hippocampus—Py for both; cerebral cortex—Cl and Pir; medulla—10N and Sp5I; midbrain and pons—IPF and DpMe; forebrain—aci and CPu; thalamus—PV and PVA and cerebellum—Sim for both (see Appendix 1 for nomenclature and Figure 1—figure supplement 1 for transcript count and representative photomicrographs).

Figure 1 with 1 supplement see all
Oxtr expression in the male brain.

(A) RNAscope revealed Oxtr-positive transcripts in the epididymis, but not in the liver (positive and negative controls, respectively). Also shown are representative micrographs of the posteromedial part of the amygdalohippocampal area (AHiPM) of the hypothalamus, pyramidal cell layer (Py) of the hippocampus, and the third ventricle (3V) of the ventricular regions. Scale bar: 50 µm. (B) Oxtr transcript density in the brain regions detected by RNAscope. (C) Oxtr transcript density in nuclei, sub-nuclei, and regions of the ventricular system, hypothalamus, olfactory bulb, hippocampus, cerebral cortex, medulla, midbrain and pons, forebrain, thalamus, and cerebellum.

Figure 1—source data 1

Oxtr densities in brain nuclei, subnuclei and regions.

https://cdn.elifesciences.org/articles/95215/elife-95215-fig1-data1-v2.xlsx

In females, we report the expression of the Oxtr in 301 mouse brain nuclei, sub-nuclei, and regions. Probe specificity was again established by a positive signal in the ovary with no signal in the liver (Figure 2A). Transcript density was highest in the hippocampus, followed, in descending order, by the olfactory bulb, hypothalamus, cerebral cortex, ventricular regions, forebrain, medulla, thalamus, midbrain and pons, and cerebellum (Figure 2B). High Oxtr transcript densities and counts, respectively, were also noted in several nuclei, sub-nuclei, and regions as follows (Figure 2B): hippocampus—Py for both; olfactory bulb—AOD and GrO; hypothalamus—SO and PMCo; cerebral cortex—AIP and Pir; ventricular regions—ependyma of the OV and SVZ; forebrain—SFO and aci; medulla—10N for both; thalamus—PV for both; midbrain and pons—EW and PAG and cerebellum—6Cb for both (see Appendix 1 for nomenclature and Figure 2—figure supplement 1 for transcript count and representative photomicrographs).

Figure 2 with 1 supplement see all
Oxtr expression in the female brain.

(A) Representative micrographs of the supraoptic nucleus (SO) of the hypothalamus, the pyramidal cell layer (Py) of the hippocampus, and anterior olfactory nucleus, dorsal part (AOD) of the olfactory bulb are shown. Ovary and liver served as positive and negative controls, respectively. Scale bar: 50 µm. (B) Oxtr transcript density in the brain regions detected by RNAscope. (C) Oxtr transcript density in nuclei, sub-nuclei, and regions of the hippocampus, olfactory bulb, hypothalamus, cerebral cortex, ventricular system, forebrain, medulla, thalamus, midbrain and pons, and cerebellum.

Figure 2—source data 1

Oxtr densities in brain nuclei, subnuclei and regions.

https://cdn.elifesciences.org/articles/95215/elife-95215-fig2-data1-v2.xlsx

RNAscope also revealed Oxt expression in the hypothalamus and forebrain of both male and female mice (Figure 3A and B). High Oxt counts were detected in several nuclei, sub-nuclei, and regions of females and males, respectively, as follows (Figure 3C): hypothalamus—PaMP and PaMM and forebrain—MPA and LPO. Overall, the numbers of Oxt-expressing cells were markedly greater in female compared to the male mice. That is, we found 22 hypothalamic and forebrain regions with 486 Oxt-positive cells in the female mouse. In contrast, there were 15 hypothalamic and forebrain regions containing 308 Oxt-positive cells in the male brain. Breaking this down, in the hypothalamus, the number of Oxt-positive cells was 372 in the female compared with 228 Oxt-positive cells in the male. The number of Oxt-positive cells was 114 in the female forebrain compared with 80 Oxt-positive cells in the male forebrain.

Sex differences in Oxt expression in the mouse brain.

(A) The neurohypophysial hormone OXT is synthesized by magnocellular neurons primarily located in the PVH and SON hypothalamic nuclei. The magnocellular neurons send extended axonal projections into the neurohypophysis where OXT is released into the circulation in response to physiological demands. Therefore, PVH and SON served as positive controls for OXT expression in the brain. MPA: medial preoptic area; LPO: lateral preoptic area of the forebrain. Scale bar: 50 µm. (B) Sex differences in the numbers of Oxt-expressing neurons in nuclei, sub-nuclei, and regions of the hypothalamus and forebrain detected by RNAscope. (C) Total numbers of Oxt-expressing neurons in nuclei, sub-nuclei, and regions of the hypothalamus and forebrain of male and female mice. (D) Oxt transcript density in nuclei, sub-nuclei, and regions of the hypothalamus and forebrain of male and female mice. N = 3, values are shown as means ± SE. Student’s t-test.

Figure 3—source data 1

Numbers of OXT-positive cells in the hypothalamus and forebrain.

https://cdn.elifesciences.org/articles/95215/elife-95215-fig3-data1-v2.xlsx

Oxtr expression was also mapped in regions and sub-regions within the hypothalamus (Figure 1 and Figure 1—figure supplement 1). Certain of these hypothalamic sub-regions, such as the lateral hypothalamus (LH) and dorsomedial hypothalamus (DM), send sympathetic nervous system (SNS) outflow to both bone and fat tissue (Ryu et al., 2015; Ryu et al., 2017). Additionally, RNAscope also showed Oxtr expression in both anterior and posterior pituitary lobes (Figure 4A), with Oxtr transcript density that was markedly higher in the female compared with male mice (Figure 4B).

Sex differences in Oxtr expression in the pituitary gland.

(A) Representative photomicrographs showing sex differences in Oxtr expression in anterior (AP) and posterior (PP) lobes of the pituitary gland detected by RNAscope. Scale bar: 25 µm. (B) Quantification of Oxtr transcript density in the pituitary gland of female and male mice (n=3).

Figure 4—source data 1

Sex-specific Oxtr densities in the pituitary gland.

https://cdn.elifesciences.org/articles/95215/elife-95215-fig4-data1-v2.xlsx

We also found that six hypothalamic nuclei, sub-nuclei, and regions in male mice displayed overlapping Oxt and Oxtr transcripts. Oxtr/Oxt ratios within the same brain site were as follows: 0.70 in the medial parvicellular part of the paraventricular hypothalamic nucleus (PaMP); 1.51 in the medial magnocellular part of the paraventricular hypothalamic nucleus (PaMM); 6.39 in the lateral magnocellular part of the paraventricular hypothalamic nucleus (PaLM); 26.8 in the arcuate nucleus (Arc); 109.50 in the medial amygdaloid nucleus (MeA); 151.13 in the tuber cinereum area (TC), and 222.00 in the lateroanterior hypothalamic nucleus (LA). In contrast, we found three forebrain nuclei, sub-nuclei, and regions in female mice with overlapping Oxt and Oxtr transcripts. Oxtr/Oxt ratios within the same brain site were as follows: 1.35 in the anterior commissural nucleus (AC); 3.50 in the medial preoptic nucleus, medial part (MPOM), and 13.0 in the bed nucleus of the stria terminalis, medial division, and posterolateral part (BSTMPL). As with the hypothalamus, Oxtr/Oxt ratios in ten nuclei, sub-nuclei, and regions were 0.05 in the PaLM; 0.18 in the PaMM; 0.82 in the paraventricular hypothalamic nucleus, anterior parvicellular part (PaAP); 1.74 in the LA; 5.83 in the anterior hypothalamic area, posterior part (AHP); 8.00 in the anterior hypothalamic area, anterior part (AHA); 9.33 in the supraoptic nucleus (SO); 39.0 in the ventromedial hypothalamic nucleus, dorsomedial part (VMHDM); 40.7 in the TC and 75.3 in the lateral hypothalamic area (LH).

Discussion

Here, we supplement and integrate previous information on OXT and OXTR expression in the murine brain and report, for the first time, abundant OXTR expression in 301 and 359 brain nuclei, sub-nuclei, and regions in females and males, respectively, as well as, importantly, sex-specific Oxt and Oxtr expression. This report is thus the most comprehensive atlas of brain Oxt and Oxtr expression at the single transcript level. Expression of both Oxt and Oxtr, particularly in overlapping hypothalamic sub-nuclei, nuclei, and regions, points to functionally active neuronal nodes within a large-scale OXT-OXTR network in the brain.

It has been reported that cell bodies and dendrites of OXT-producing neurons within the PVH and SON release OXT and AVP within the magnocellular nuclei, where we find the highest Oxtr/Oxt colocalization—this suggests an additional, possibly paracrine action of OXT (Ludwig and Leng, 2006; Neumann et al., 1993; Neumann, 2007; Pow and Morris, 1989). Indeed, locally released OXT is involved in pre- and post-synaptic modulation of the electrical activity (Bourque et al., 1993; Shibuya et al., 2000; Kombian et al., 1997). Similar to magnocellular neurons of the PVH, we find that several Oxt-producing neuronal populations also overlap with Oxtr expression in other hypothalamic sites—hereby termed ‘Oxtr/Oxt nodes’—these include Arc, MeA, TC, and LA.

It is now well known that central OXT decreases ingestive behavior while OXTR antagonism has the opposing effect in rodents (Liu et al., 2021; Arletti et al., 1990; Blevins et al., 2016; Klockars et al., 2018; Liu et al., 2020; Noble et al., 2014; Ong et al., 2015). Of note is that, in addition to the nucleus of the solitary tract (NTS) (Ong et al., 2015), the Oxtr/Oxt node in the Arc (and, possibly, Arc-bordering LA) rapidly induces satiety (Fenselau et al., 2017) and suppresses excessive food intake to control ingestive behavior (Inada et al., 2022). In terms of sex-specific ability of OXT to inhibit ingestive behavior, it has been reported that the capacity of OXT to decrease food intake is attenuated in females compared with males, whereas lower OXT doses are effective at reducing food intake in males, and doses that are effective in both sexes reduce consumption for a longer duration in males (Liu et al., 2020). The Oxtr/Oxt node in the MeA likely explains the paracrine regulation by OXT of male preference for females and their scents (Yao et al., 2017). Thus, the ablation of Oxtr in aromatase-expressing neurons of the MeA fully recapitulates the elimination of female preference in males, suggesting that this node is both necessary and sufficient for social recognition (Ferguson et al., 2001). Lastly, the TC is a sheet of gray matter that forms a median eminence (ME) around the base of the pituitary stalk or infundibulum; therefore, the Oxtr/Oxt node in the TC (and tanycyte) could be important for mediating bidirectional brain–periphery crosstalk by modulating the blood–hypothalamus brain barrier.

Although we detected clear sex differences and similarities in Oxtr transcript expression in multiple brain areas, here we will focus on those associated with stress, energy homeostasis, emotional, and affective behaviors. Surprisingly, the highest Oxtr transcript density was noted in the ependymal layers of the OV and 3V in both sexes with greater expression density in males and, not surprisingly, in the hypothalamus (Sofroniew, 1983; Swanson and Sawchenko, 1983; Landgraf and Neumann, 2004). In the hypothalamus, the highest density was found in the posteriomedial part of the amygdalohippocampal area (AHiPM) of males compared to that in females. It has been reported that in male mice, ~40% of Oxtr-positive neurons of the amygdalohippocampal area (AHi) project to the medial preoptic area (MPOA) (Sato et al., 2020). Activation of these neurons, comprising excitatory projections to the MPOA, enhances exclusively an aggressive, but not parental behavior, towards pups (Sato et al., 2020). Of interest, females display the highest Oxtr density in the arcuate nucleus (Arc) compared to that of males. ArcVglut2 neurons have been reported to express the gene encoding Oxtr (Fenselau et al., 2017). Given that intra-Arc OXT acutely suppresses food intake and OXT exerts a direct stimulatory effect on Arc-OXTR neurons, it is plausible that the Arc-OXTR-satiety circuit, at least, responding to diet-induced hyperphagia (Maric et al., 2022), is pronounced in female rather than male mice. Indeed, it was demonstrated that female rats and mice display a lower than male level of diet-induced overeating (Maric et al., 2022).

The male olfactory bulb and hippocampus also displayed abundant Oxtr transcripts, with the highest density in the vomeronasal nerve (vn) and the pyramidal cell layer of the hippocampus (Py), respectively, in comparison to the female anterior olfactory nucleus, dorsal part (AOD) as well as the same (Py) hippocampal subregion. It has been reported that Oxtrs are expressed in the vomeronasal organ, an olfactory sensory structure involved in the detection of non-volatile chemosignals. OXT injection in mice has been shown to reduce pup-induced vomeronasal activity and aggressive behavior (Nakahara et al., 2020). Given vomeronasal activity declines as males grow up from a pup-aggressive state to a non-aggressive parental state, high Oxtr expression in the vn might indicate a functional switch from pup-aggressive behavior towards strengthening social and sexual behaviors during adolescence and adulthood. The highest Oxtr transcript densities in the AOD, AOM, and AOV of females are consistent with OXT function in the anterior olfactory region, particularly in relation to social cue processing and social recognition (Oettl et al., 2016). As with the hippocampal Py, Oxtrs are found in both excitatory and inhibitory pyramidal neurons within the CA2 and CA3 subregions of the hippocampus, suggesting that OXTRs in the Py may have a role in local circuits relating to stress, emotional, and affective behaviors.

In the cortex, we found that agranular insular cortex, posterior part (AIP) of females and claustrum (Cl) of males displayed the highest Oxtr transcript density. PVH- and SON-OXT neurons project to a wide range of cortical and limbic structures including AIP, Cl, hippocampus, medial amygdala, and the lateral septum, all of which comprise the social recognition memory circuit (Mitre et al., 2016; Ferguson et al., 2001; Son et al., 2022; Tanimizu et al., 2017; Wang and Zhan, 2022). SON neurons, upon activation by the OXTR, release OXT—a putative paracrine loop. Moreover, OXTRs mediate cardiac sympathetic stimulation through direct PVH projections to the intermediolateral column of the spinal cord (Japundžić-Žigon, 2013). Such reciprocal communications are supported by the studies inferring that affiliative social interactions increase OXT activity, which is followed by an anti-stress response, thus promoting bonding, relaxation, and growth, while reducing cardiovascular and neuroendocrine stress (Grippo et al., 2009; Krause et al., 2011; Lee et al., 2005; Windle et al., 1997; Wsol et al., 2008).

Both males and females had the highest Oxtr transcript density in the medullary dorsal motor nucleus of vagus (10N), as has been shown previously in the rat (Raggenbass et al., 1988; Dreifuss et al., 1988; Raggenbass et al., 1987). The OXT-sensitive vagal neurons are mostly preganglionic motor neurons, projecting to the cervical, thoracic, and abdominal visceral areas (Raggenbass et al., 1987). It has also been shown that the microinjection of an OXT antagonist into the 10N blocks the increase in gastric acid secretion and bradycardia induced by electrical stimulation of the PVH—this suggests a role for central OXT in autonomic efferent activity (Rogers and Hermann, 1986).

Finally, we have recently published an atlas of pituitary glycoprotein hormone receptors, namely Tshr, Fshr, and Lhcgr, in more than 400 brain sites (Ryu et al., 2022). Surprisingly, we find a striking overlap in receptor distribution among the four receptors, including the Oxtr—with highest transcript levels in the ependymal layer of the third ventricle and olfactory bulb. While the role of olfactory OXTRs in social recognition is well established (Oettl et al., 2016; Sun et al., 2021; Oettl and Kelsch, 2018), the functional significance of OXTRs in the ependymal layer is yet unknown. However, in light of ubiquitous and newly emerging OXTR expression in the brain and peripheral organs, ependymal OXTRs seem to have an important role in gating the bidirectional brain–periphery crosstalk.

Despite higher plasma OXT levels in women than in men (Marazziti et al., 2019), prior, largely immunohistochemistry-based studies failed to identify a sex difference in Oxt expression in the brain. Similar numbers of OXT-positive immunoreactive (-IR) neurons were found in the PVH, SON, MPOA, and bed nucleus of stria terminalis (BNST) of prairie, pine, meadow, and montane voles (Wang et al., 1996), PVH and SON of naked mole rats (Rosen et al., 2008), and PVH, MPOA, LH, and anterior hypothalamus (AH) of long-tailed hamsters (Xu et al., 2010). Furthermore, no sex differences were detected in OXT-IR neurons in the PVH, SON, BNST, MeA in several species of non-human primates (Caffé et al., 1989; Wang et al., 1997a; Wang et al., 1997b). There were also no sex differences in Oxt mRNA expression in the PVH and SON of the rat (for review, see Dumais and Veenema, 2016). Lastly, there were no sex differences in the number or size of OXT neurons in the PVH and SON in humans (Wierda et al., 1991; Fliers et al., 1985; Ishunina and Swaab, 1999). By contrast, here we establish sex differences in Oxt expression in the mouse brain. Both the hypothalamus and forebrain of the females contained visibly more Oxt-positive cells compared with males. Whereas as expected, hypothalamic PVH of both sexes had high Oxt expression, the medial preoptic area (MPA) of the female forebrain and the lateral preoptic area (LPO) of the male forebrain contained the highest number of Oxt-expressing cells.

The neuroanatomical reality of the brain–bone–fat SNS feedback loops suggests coordinated and/or multiple redundant control of bone and fat remodeling (Ryu et al., 2024). We have noted that regions, such as the LH, DM, tuber cenereum area (TC), basolateral amygdaloid nucleus, and others, known to send SNS outflow to both bone and adipose tissues, express the Oxtr (Ryu et al., 2015; Ryu et al., 2017). Surprisingly, female mice had visibly fewer Oxtr counts in aforementioned sites compared to males, perhaps due to the organizational and activational effects of sex hormones (Kammel and Correa, 2020). This raises the possibility that certain actions of OXT on peripheral tissues, such as on body composition and bone, may also be mediated centrally. Indeed, non-classical actions of OXT include its ability to affect bone remodeling, wherein it stimulates bone formation by osteoblasts and modulates the function of bone-resorbing osteoclasts (Sun et al., 2019). We have also shown that OXT and vasopressin have opposing skeletal actions—effects that may relate to the pathogenesis of bone loss in pregnancy and lactation, and in chronic hyponatremia, respectively (Sun et al., 2019; Sun et al., 2016; Tamma et al., 2009; Tamma et al., 2013). As with fat remodeling, it has been demonstrated that mice deficient in either OXT or OXTRs develop late-onset obesity despite normal ingestive behavior (Takayanagi et al., 2008). Moreover, the increased body weight in OXT knockout mice is accompanied by a 40% increase in abdominal adiposity (Camerino, 2009).

In all, studies on central OXT signaling and its control of reproductive, metabolic, and ingestive functions, and social behaviors occupy the vast majority of the literature. It is our hope that this comprehensive compendium of sex-specific Oxt and Oxtr expression in the brain will stimulate further investigations by others. In more general terms, the direct mapping of receptor expression in the brain and periphery provides the framework for determining new functions of ancient pituitary hormones and helps refocus at least some in the field towards paradigm-shifting discoveries of non-traditional, multifaceted roles of OXT.

Methods

Mice

Adult C57BL/6J mice (~3–4-month-old) were housed in a 12 h:12 h light:dark cycle at 22 ± 2°C with ad libitum access to water and regular chow. All procedures were approved by the Mount Sinai Institutional Animal Care and Use Committee and are in accordance with Public Health Service and United States Department of Agriculture guidelines. Ethical approval for all experimental procedures wasobtained from the appropriate Institutional Review Board under protocol number PROTO202100038.

RNAscope

Brains and pituitary glands were collected from male and female mice (n=3) for RNAscope. Briefly, mice were anesthetized with isoflurane (2–3% in oxygen; Baxter Healthcare, Deerfield, IL) and transcardiacally perfused with 0.9% heparinized saline followed by 10% neutral buffered formalin (NBF). Brains were extracted, sectioned into 0.5 cm (whole pituitary and adrenal glands) thick slices, and post-fixed in 10% NBF for 24 h, dehydrated, and embedded into paraffin. Coronal sections were cut at 5 μm with every tenth section mounted onto ~60 slides with three sections on each slide. This method allowed us to cover the entire brain and eliminate the likelihood of counting the same transcript twice. Sections were air-dried overnight at room temperature and stored at 4°C until required.

Detection of mouse Oxt and Oxtr was performed separately on paraffin sections using Advanced Cell Diagnostics (ACD) RNAscope 2.5 LS Multiplex Reagent Kit (#322100) and two RNAscope 2.5 LS probes, namely Mm-OXT (#493178) and Mm-OXTR (#412178). Epididymis/ovary and liver served as positive and negative controls for Oxtr, respectively. As with OXT, magnocellular cells of the PVH and SON served as positive controls while the brain from Oxt knockout mouse served as a negative control.

Slides were baked at 60°C for 1 h, deparaffinized, incubated with hydrogen peroxide for 10 min at room temperature, pretreated with Target Retrieval Reagent (#322001) for 20 min at 100°C and with Protease III for 30 min at 40°C. Probe hybridization and signal amplification were performed as per the manufacturer’s instructions for chromogenic assays.

Following the RNAscope assay, the slides were scanned at ×20 magnification, and the digital image analysis was successfully validated using the CaseViewer 2.4 (3DHISTECH, Budapest, Hungary) software. The same software was employed to capture and prepare images for the figures in the article. Images of control tissues were taken using a Leica DM 1000 microscope. Detection of Oxtr- and Oxt-positive cells was also performed using the QuPath-0.2.3 (University of Edinburgh, UK) software based on receptor intensity thresholds, size, and shape.

Statistical analysis

Data were analyzed by two-tailed Student’s t-test and one-way repeated measures analysis of variance followed by Holm–Sidak’s or Bonferroni’s least significant difference post hoc tests using GraphPad Prism 10 (Boston, MA). Significance was set at p<0.05. For simplicity and clarity, exact test results and exact p values are not presented.

Appendix 1

Appendix 1—table 1
Glossary of the brain nuclei, sub-nuclei, and regions.
Olfactory bulb
AOBaccessory olfactory bulb
AODanterior olfactory nucleus, dorsal part
AOEanterior olfactory nucleus, external part
AOLanterior olfactory nucleus, lateral part
AOManterior olfactory nucleus, medial part
AOVanterior olfactory nucleus, ventral part
EPIexternal plexiform layer of the olfactory bulb
EPIAexternal plexiform layer of the accessory olfactory bulb
GIAglomerular layer of the accessory olfactory bulb
GrAgranule cell layer of the accessory olfactory bulb
GrOgranular cell layer of the olfactory bulb
lolateral olfactory tract
LOTnucleus of the lateral olfactory tract
Mimitral cell layer of the olfactory bulb
MiAmitral cell layer of the accessory olfactory bulb
ONolfactory nerve layer
vnvomeronasal nerve
Cerebral cortex
AIPagranular insular cortex, posterior part
Au1primary auditory cortex
AuDsecondary auditory cortex, dorsal area
AuVsecondary auditory cortex, ventral area
Clclaustrum
Cg/RScingular/retrosplenial cortex
DEndorsal endopiriform nucleus
DIdysgranular insular cortex
DLOdorsolateral orbital cortex
Ectectorhinal cortex
FrAfrontal association cortex
GIgranular insular cortex
LEntlateral entorhinal cortex
LOlateral orbital cortex
LPtAlateral parietal association cortex
M1primary motor cortex
M2secondary motor cortex
MEntmedial entorhinal cortex
MOmedial orbital cortex
MPtAmedial parietal association cortex
Pirpiriform cortex
PRhperirhinal cortex
PrLprelimbic cortex
RSAretrosplenial agranular cortex
RSGretrosplenial granular cortex
S1primary somatosensory cortex
S1BFprimary somatosensory cortex, barrel field
S1DZprimary somatosensory cortex, dysgranular region
S1FLprimary somatosensory cortex, forelimb region
S1HLprimary somatosensory cortex, hindlimb region
S1ShNcprimary somatosensory cortex, shoulder/neck region
S1Trprimary somatosensory cortex, trunk region
S2secondary somatosensory cortex
TeAtemporal association cortex
V1primary visual cortex
V2Lsecondary visual cortex, lateral area
V2MLsecondary visual cortex, mediolateral area
V2MMsecondary visual cortex, mediomedial area
VEnventral endopiriform nucleus
VOventral orbital cortex
Forebrain
ACanterior commissural nucleus
acianterior commissure, intrabulbar part
BSTIAbed nucleus of the stria terminalis, intraamygdaloid division
BSTMPLbed nucleus of the stria terminalis, medial division, posterolateral part
BSTMVbed nucleus of the stria terminalis, medial division, ventral part
BSTSbed nucleus of stria terminalis, supracapsular part
IPACinterstitial nucleus of the posterior limb of the anterior commissure
LPOlateral preoptic area
LSVlateral septal nucleus, ventral part
MCPOmagnocellular preoptic nucleus
MPAmedial preoptic area
MPOCmedial preoptic nucleus, central part
MPOMmedial preoptic nucleus, medial part
SFOsubfornical organ
ststria terminalis
VLPOventrolateral preoptic nucleus
Hippocampus
CA1field ca1 of hippocampus
CA2field ca2 of hippocampus
CA3field CA3 of hippocampus
DGdentate gyrus
ffornix
fifimbria of the hippocampus
GrDGgranular layer of the dentate gyrus
LMollacunosum moleculare layer of the hippocampus
Molmolecular layer of the dentate gyrus
Ororiens layer of the hippocampus
PoDGpolymorph layer of the dentate gyrus
Pypyramidal tract
Ssubiculum
SLustratum lucidum, hippocampus
vhcventral hippocampal commissure
Thalamus
ADanterodorsal thalamic nucleus
AManteromedial thalamic nucleus
AMVanteromedial thalamic nucleus, ventral part
Angangular thalamic nucleus
APTDanterior pretectal nucleus, dorsal part
APTVanterior pretectal nucleus, ventral part
AVDManteroventral thalamic nucleus, dorsomedial part
AVVLanteroventral thalamic nucleus, ventrolateral part
CLcentrolateral thalamic nucleus
CMcentral medial thalamic nucleus
DLGdorsal lateral geniculate nucleus
emlexternal medullary lamina
Ethethmoid thalamic nucleus
Fnucleus of the fields of Forel
frfasciculus retroflexus
IADinteranterodorsal thalamic nucleus
IAMinteranteromedial thalamic nucleus
icinternal capsule
IGLintergeniculate leaf
IMAintramedullary thalamic area
IMDintermediodorsal thalamic nucleus
LDDMlaterodorsal thalamic nucleus, dorsomedial part
LDVLlaterodorsal thalamic nucleus, ventrolateral part
LGPlateral globus pallidus
LHblateral habenular nucleus
LPLRlateral posterior thalamic nucleus, laterorostral part
LPMClateral posterior thalamic nucleus, mediocaudal part
LPMRlateral posterior thalamic nucleus, mediorostral part
MDmediodorsal thalamic nucleus
MDCmediodorsal thalamic nucleus, central part
MDLmediodorsal thalamic nucleus, lateral part
MDMmediodorsal thalamic nucleus, medial part
MGPmedial globus pallidus (entopeduncular nucleus)
MHbmedial habenular nucleus
MPTmedial pretectal nucleus
OPTolivary pretectal nucleus
PCparacentral thalamic nucleus
PFparafascicular thalamic nucleus
Poposterior thalamic nuclear group
PPTposterior pretectal nucleus
PRprerubral field
PrCprecommissural nucleus
PTparatenial thalamic nucleus
pvperiventricular fiber system
PVparaventricular thalamic nucleus
PVAparaventricular thalamic nucleus, anterior part
PVPparaventricular thalamic nucleus, posterior part
Rereuniens thalamic nucleus
REthretroethmoid nucleus
Rhrhomboid thalamic nucleus
RIrostral interstitial nucleus of medial longitudinal fasciculus
Rtreticular thalamic nucleus
Scscaphoid thalamic nucleus
smstria medullaris of the thalamus
SPFsubparafascicular thalamic nucleus
SPFPCsubparafascicular thalamic nucleus, parvicellular part
SThsubthalamic nucleus
strsuperior thalamic radiation
Subsubmedius thalamic nucleus
SubGsubgeniculate nucleus
VAventral anterior thalamic nucleus
VLventrolateral thalamic nucleus
VLGventral lateral geniculate nucleus
VLGMCventral lateral geniculate nucleus, magnocellular part
VLGPCventral lateral geniculate nucleus, parvicellular part
VMventromedial thalamic nucleus
VPLventral posterolateral thalamic nucleus
VPMventral posteromedial thalamic nucleus
VReventral reuniens thalamic nucleus
Xixiphoid thalamic nucleus
Hypothalamus
AADanterior amygdaloid area, dorsal part
ACoanterior cortical amygdaloid nucleus
AHAanterior hypothalamic area, anterior part
AHCanterior hypothalamic area, central part
AHiALamygdalohippocampal area, anterolateral part
AHiPMamygdalohippocampal area, posteromedial part
AHPanterior hypothalamic area, posterior part
APiramygdalopiriform transition area
Arcarcuate hypothalamic nucleus
ArcMParcuate hypothalamic nucleus, medial posterior part
AStramygdalostriatal transition area
BLAbasolateral amygdaloid nucleus, anterior part
BLPbasolateral amygdaloid nucleus, posterior part
BLVbasolateral amygdaloid nucleus, ventral part
BMAbasolateral amygdaloid nucleus, anterior part
BMPbasomedial amygdaloid nucleus, posterior part
CeCcentral amygdaloid nucleus, capsular part
CeLcentral amygdaloid nucleus, lateral division
CeMcentral amygdaloid nucleus, medial division
CeMPVcentral amygdaloid nucleus, medial posteroventral part
cpcerebral peduncle, basal part
CxAcortex-amygdala transition zone
DMdorsomedial hypothalamic nucleus
FFfields of Forel
Iintercalated nuclei of the amygdala
IMintercalated amygdaloid nucleus, main part
LAlateroanterior hypothalamic nucleus
Lalateral amygdaloid nucleus
LaDLlateral amygdaloid nucleus, dorsolateral part
LaVLlateral amygdaloid nucleus, ventrolateral part
LaVMlateral amygdaloid nucleus, ventromedial part
LHlateral hypothalamic area
LMlateral mammillary nucleus
MCLHmagnocellular nucleus of the lateral hypothalamus
MEmedian eminence
MeAmedial amygdaloid nucleus, anterior part
MeADmedial amygdaloid nucleus, anteriodorsal part
MePDmedial amygdaloid nucleus, posterodorsal part
MePVmedial amygdaloid nucleus, posteroventral part
MLmedial mammillary nucleus, lateral part
MMmedial mammillary nucleus, medial part
MMnmedial mammillary nucleus, median part
mtmammillothalamic tract
mtgmammillotegmental tract
nsnigrostriatal bundle
optoptic tract
PaAPparaventricular hypothalamic nucleus, anterior parvicellular part
PaDCparaventricular hypothalamic nucleus, dorsal cap
PaLMparaventricular hypothalamic nucleus, lateral magnocellular part
PaMMparaventricular hypothalamic nucleus, medial magnocellular part
PaMPparaventricular hypothalamic nucleus, medial parvicellular part
PaPoparaventricular hypothalamic nucleus, posterior part
PHposterior hypothalamic area
PLCoposterolateral cortical amygdaloid nucleus
pmprincipal mammillary tract
PMCoposteromedial cortical amygdaloid nucleus (C3)
PMDpremammillary nucleus, dorsal part
PRprerubral field
PSThparasubthalamic nucleus
SChsuprachiasmatic nucleus
SLEACsublenticular extended amygdala, central part
SLEAMsublenticular extended amygdala, medial part
SOsupraoptic nucleus
SORsupraoptic nucleus, retrochiasmatic part
SPasubparaventricular zone of the hypothalamus
Sublsubincertal nucleus
SuMLsupramammillary nucleus, lateral part
SuMMsupramammillary nucleus, medial part
sumxsupramammillary decussation
TCtuber cinereum area
VMHCventromedial hypothalamic nucleus, central part
VMHDMventromedial hypothalamic nucleus, dorsomedial part
VMHVLventromedial hypothalamic nucleus, ventrolateral part
VTMventral tuberomammillary nucleus
ZIzona incerta
ZIDzona incerta, dorsal part
ZIVzona incerta, ventral part
Midbrain and pons
Acs5accessory trigeminal nucleus
CICcentral nucleus of the inferior colliculus
CnFcuneiform nucleus
DCICdorsal cortex of the inferior colliculus
DMPAGdorsomedial periaqueductal gray
DMTgdorsomedial tegmental area
DpMedeep mesencephalic nucleus
DRCdorsal raphe nucleus, caudal part
DRDdorsal raphe nucleus, dorsal part
DRIdorsal raphe nucleus, interfascicular part
DRVdorsal raphe nucleus, ventral part
DTgCdorsal tegmental nucleus, central part
DTgPdorsal tegmental nucleus, pericentral part
ECICexternal cortex of the inferior colliculus
EMiepimicrocellular nucleus
I5intertrigeminal nucleus
InCointercollicular nucleus
IPFinterpeduncular fossa
IPIinterpeduncular nucleus, intermediate subnucleus
KFKo¨lliker-Fuse nucleus
LDTglaterodorsal tegmental nucleus
LDTgVlaterodorsal tegmental nucleus, ventral part
LPAGlateral periaqueductal gray
LPBClateral parabrachial nucleus, central part
LPBDlateral parabrachial nucleus, dorsal part
LPBElateral parabrachial nucleus, external part
LPBSlateral parabrachial nucleus, superior part
LPBVlateral parabrachial nucleus, ventral part
MCPCmagnocellular nucleus of the posterior commissure
Me5mesencephalic trigeminal nucleus
MGVmedial geniculate nucleus, ventral part
MiTgmicrocellular tegmental nucleus
mlmedial lemniscus
mlfmedial longitudinal fasciculus
MnRmedian raphe nucleus
Mo5motor trigeminal nucleus
MPBmedial parabrachial nucleus
P5peritrigeminal zone
PAGperiaqueductal gray
PC5parvicellular motor trigeminal nucleus
pcposterior commissure
PComnucleus of the posterior commissure
PMnRparamedian raphe nucleus
PnCpontine reticular nucleus, caudal part
PnOpontine reticular nucleus, oral part
PnRpontine raphe nucleus
PnVpontine reticular nucleus, ventral part
PPTgpedunculopontine tegmental nucleus
RCraphe cap
RPFretroparafascicular nucleus
RtTgreticulotegmental nucleus of the pons
RtTgPreticulotegmental nucleus of the pons, pericentral part
Sagsagulum nucleus
scpsuperior cerebellar peduncle (brachium conjunctivum)
SNCsubstantia nigra, compact part
SNRsubstantia nigra, reticular part
SPTgsubpedencular tegmental nucleus
Su5supratrigeminal nucleus
SubCDsubcoeruleus nucleus, dorsal part
SubCVsubcoeruleus nucleus, ventral part
tstectospinal tract
Tznucleus of the trapezoid body
VLPAGventrolateral periaqueductal gray
VTAventral tegmental area
VTgventral tegmental nucleus
xscpdecussation of the superior cerebellar peduncle
Medulla
7Nfacial nucleus
10Ndorsal motor nucleus of vagus
12Nhypoglossal nucleus
Ambambiguus nucleus
AParea postrema
Cucuneate nucleus
DLLdorsal nucleus of the lateral lemniscus
DMSp5dorsomedial spinal trigeminal nucleus
DPOdorsal periolivary region
ECuexternal cuneate nucleus
Gigigantocellular reticular nucleus
icpinferior cerebellar peduncle (restiform body)
ILLintermediate nucleus of the lateral lemniscus
Inintercalated nucleus of the medulla
IOBeinferior olive, subnucleus B of medial nucleus
IOCinferior olive, subnucleus C of medial nucleus
IODinferior olive, dorsal nucleus
IOKinferior olive, cap of Kooy of the medial nucleus
IRtintermediate reticular nucleus
lfplongitudinal fasciculus of the pons
LPGilateral paragigantocellular nucleus
LRtlateral reticular nucleus
LSOlateral superior olive
LVPOlateroventral periolivary nucleus
MdDmedullary reticular nucleus, dorsal part
MdVmedullary reticular nucleus, ventral part
mlmedial lemniscus
MVemedial vestibular nucleus
MVPOmedioventral periolivary nucleus
PCRtparvicellular reticular nucleus
PLparalemniscal nucleus
PMnparamedian reticular nucleus
Prprepositus nucleus
Pr5principal sensory trigeminal nucleus
Pr5DMprincipal sensory trigeminal nucleus, dorsomedial part
Pr5VLprincipal sensory trigeminal nucleus, ventrolateral part
PSolparasolitary nucleus
pypyramidal tract
RMgraphe magnus nucleus
RParaphe pallidus nucleus
RPOrostral periolivary region
RVLrostroventrolateral reticular nucleus
s5sensory root of the trigeminal nerve
SolCnucleus of the solitary tract, commissural part
SolCenucleus of the solitary tract, central part
SolDLsolitary nucleus, dorsolateral part
SolDMnucleus of the solitary tract, dorsomedial part
SolGnucleus of the solitary tract, gelatinous part
SolInucleus of the solitary tract, interstitial part
SolIMnucleus of the solitary tract, intermediate part
SolMnucleus of the solitary tract, medial part
SolVsolitary nucleus, ventral part
SolVLnucleus of the solitary tract, ventrolateral part
sp5spinal trigeminal tract
Sp5Ispinal trigeminal nucleus, interpolar part
SPOsuperior paraolivary nucleus
SpVespinal vestibular nucleus
VCAventral cochlear nucleus, anterior part
vscventral spinocerebellar tract
Cerebellum
6Cb6th Cerebellar lobule
7Cb7th Cerebellar lobule
9Cb9th Cerebellar lobule
Antanterior lobe cerebellum
Crus1crus 1 of the ansiform lobule
Crus2crus 2 of the ansiform lobule
FIflocculus
mcpmiddle cerebellar peduncle
PFIparaflocculus
PMparamedian lobule
Simsimple lobule
Ventricular zones
3V3rd ventricle
OVolfactory ventricle (olfactory part of lateral ventricle)

Data availability

All data generated or analyzed during this study are included in the manuscript and supporting files; source data files have been provided for Figures 14, Figure 1—figure supplement 1 and Figure 2—figure supplement 1.

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Article and author information

Author details

  1. Vitaly Ryu

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Formal analysis, Investigation, Methodology, Writing – original draft
    For correspondence
    vitaly.ryu@mssm.edu
    Competing interests
    Reviewing editor, eLife
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0001-8068-4577
  2. Anisa Azatovna Gumerova

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Investigation, Visualization, Methodology
    Competing interests
    No competing interests declared
  3. Georgii Pevnev

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Investigation
    Competing interests
    No competing interests declared
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0003-2015-9310
  4. Funda Korkmaz

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Validation, Investigation
    Competing interests
    No competing interests declared
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0002-9174-8369
  5. Hasni Kannangara

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Formal analysis, Validation
    Competing interests
    No competing interests declared
  6. Liam Cullen

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Investigation
    Competing interests
    No competing interests declared
  7. Farhath Sultana

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Formal analysis, Investigation
    Competing interests
    No competing interests declared
  8. Ronit Witztum

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Investigation
    Competing interests
    No competing interests declared
  9. Steven Lee Sims

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Investigation
    Competing interests
    No competing interests declared
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0002-1636-084X
  10. Tal Frolinger

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Investigation
    Competing interests
    No competing interests declared
  11. Ofer Moldavski

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Investigation
    Competing interests
    No competing interests declared
  12. Orly Barak

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Investigation, Project administration
    Competing interests
    No competing interests declared
  13. Emily Weiss

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Formal analysis, Investigation
    Competing interests
    No competing interests declared
  14. Jay J Cao

    United States Department of Agriculture, Grand Forks Human Nutrition Research Center, Grand Forks, ND 58203, Grand Forks, United States
    Contribution
    Resources, Investigation
    Competing interests
    Reviewing editor, eLife
  15. Daria Lizneva

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Investigation, Project administration
    Competing interests
    Reviewing editor, eLife
  16. Ki A Goosens

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Data curation, Supervision
    Competing interests
    Reviewing editor, eLife
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0002-5246-2261
  17. Tony Yuen

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Conceptualization, Supervision, Funding acquisition, Project administration, Writing – review and editing
    Competing interests
    Senior editor, eLife
  18. Mone Zaidi

    1. Institute for Translational Medicine and Pharmacology (ITMaP), Icahn School of Medicine at Mount Sinai, New York, United States
    2. Departments of Medicine and of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, United States
    Contribution
    Conceptualization, Funding acquisition, Writing – original draft, Project administration, Writing – review and editing
    For correspondence
    mone.zaidi@mountsinai.org
    Competing interests
    consults for Gershon Lehmann, Guidepoint and Coleman groups
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0001-5911-9522

Funding

National Institute on Aging (R01 AG071870)

  • Tony Yuen
  • Mone Zaidi

National Institute on Aging (R01 AG074092)

  • Tony Yuen
  • Mone Zaidi

National Institute on Aging (U01 AG073148)

  • Tony Yuen
  • Mone Zaidi

National Institute on Aging (U19 AG060917)

  • Mone Zaidi

National Institute of Diabetes and Digestive and Kidney Diseases (R01 DK113627)

  • Mone Zaidi

Agricultural Research Service of the United States Department of Agriculture (#3062-51000-053-00D)

  • Jay J Cao

The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.

Acknowledgements

Work at the Icahn School of Medicine at Mount Sinai carried out at the Institute for Translational Medicine and Pharmacology was supported by R01 AG071870, R01 AG074092, and U01 AG073148 to TY and MZ; and U19 AG060917 and R01 DK113627 to MZ. JJC contributed to the concept and discussion of the study and was supported by the Agricultural Research Service of the United States Department of Agriculture, #3062-51000-053-00D. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the US Department of Agriculture. The findings and conclusions in this manuscript are those of the authors and should not be construed to represent any official USDA or US Government determination or policy.

Ethics

All procedures were approved by the Mount Sinai Institutional Animal Care and Use Committee and are in accordance with Public Health Service and United States Department of Agriculture guidelines.

Copyright

This is an open-access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication.

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  1. Vitaly Ryu
  2. Anisa Azatovna Gumerova
  3. Georgii Pevnev
  4. Funda Korkmaz
  5. Hasni Kannangara
  6. Liam Cullen
  7. Farhath Sultana
  8. Ronit Witztum
  9. Steven Lee Sims
  10. Tal Frolinger
  11. Ofer Moldavski
  12. Orly Barak
  13. Emily Weiss
  14. Jay J Cao
  15. Daria Lizneva
  16. Ki A Goosens
  17. Tony Yuen
  18. Mone Zaidi
(2026)
Single transcript level atlas of oxytocin and the oxytocin receptor in the mouse brain
eLife 15:e95215.
https://doi.org/10.7554/eLife.95215

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https://doi.org/10.7554/eLife.95215