p66Shc mediates SUMO2-induced endothelial dysfunction

  1. Jitendra Kumar
  2. Shravan K Uppulapu
  3. Sujata Kumari
  4. Kanika Sharma
  5. William J Paradee
  6. Ravi Prakash Yadav
  7. Vikas Kumar
  8. Santosh Kumar  Is a corresponding author
  1. Department of Internal Medicine, Division of Cardiovascular Medicine, University of Iowa, United States
  2. Department of Genetics, Cell Biology and Anatomy, University of Nebraska Medical Center, United States
  3. Genome Editing Core Facility, University of Iowa, United States
  4. Regional Institute of Education-NCERT, India
  5. Department of Biochemistry and Molecular Biotechnology, Mass Spectrometry Facility, University of Massachusetts Chan Medical School, United States
9 figures, 1 table and 2 additional files

Figures

p66Shc mediates small ubiquitin-like modifier 2 (SUMO2)-induced reactive oxygen species (ROS) production and inflammation in endothelial cells.

(A) Immunoblot for Shc and SUMO2 expression in HUVECs following p66Shc knockdown (si-p66Shc) and SUMO2 overexpression (Ad-HA-SUMO2). (B, C) Quantification of ROS (MitoSOX fluorescence) in HUVECs from A. *p<0.05; n=24–32; Student’s t-test. (D) Quantification of ROS in HUVECs following p66Shc knockdown (si-p66Shc) and SUMO2 overexpression (Ad-HA-SUMO2). ***p<0.001, p<0.05; n=10–15; One-way ANOVA. Data represents mean ± SEM. Immunoblots are representative of at least three independent experiments. GC, scrambled siRNA used as control; HUVECs, human umbilical vein endothelial cells.

Figure 2 with 2 supplements
Small ubiquitin-like modifier 2 (SUMO2) directly modifies p66Shc.

(A) Immunoblot for sumoylated p66Shc in HEK-293 cells overexpressing SUMO2 (HA-SUMO2) and p66Shc (Flag-p66Shc). (B) Immunoblot for p66Shc sumoylation in HEK-293 cells overexpressing SUMO2 (HA-SUMO2) and p66Shc (Flag-p66Shc) with or without overexpression of Ubc9 (HA-Ubc9) and SENP1 (Flag-SENP1). (C) Immunoblot for sumoylation of p66Shc in human umbilical vein endothelial cells (HUVECs) overexpressing SUMO2 (Ad-HA-SUMO2) or p66Shc (Ad-Flag-p66Shc). (D) Immunoblot for p66Shc sumoylation in HUVEC cells overexpressing SUMO2 (Ad-HA-SUMO2) or p66Shc (Ad-Flag-p66Shc) in the presence or absence of anacardic acid. Quantification of SUMO2-p66Shc from immunoblot of D. One-way ANOVA, followed by Tukey’s post-hoc analysis, n=4 *p<0.05, **p<0.01. (F) Immunoblot for sumoylated recombinant p66Shc in the presence of absence of Ubc9. Immunoblots are representative of at least three independent experiments. Data represents mean ± SEM. Ad-Lac Z was used as an adenoviral control to compensate for the difference in MOI among the groups.

Figure 2—figure supplement 1
Small ubiquitin-like modifier 2 (SUMO2) promotes p66Shc SUMO2ylation in a dose-dependent manner.

Immunoblot of human umbilical vein endothelial cells (HUVECs) transduced with wild-type p66Shc (Ad-Flag-p66ShcWT) and SUMO2 (Ad-HA-SUMO2) at the indicated concentrations. Immunoblots are representative of at least three independent experiments.

Figure 2—figure supplement 2
Immunoblot showing the relative overexpression level of p66Shc in human umbilical vein endothelial cells (HUVECs) used for (A) experiment 2 C and (B) experiment 2D.
Figure 3 with 1 supplement
Small ubiquitin-like modifier 2 (SUMO2) modifies p66Shc at lysine-81.

(A) Modular structure of p66Shc showing conserved lysine-81 in the CH2 domain. (B) Tandem mass spectrometry of in vitro SUMO2ylated recombinant p66Shc. (C) Immunoblot showing sumoylation of p66Shc in HEK-293 cells overexpressing p66ShcWT (Flag-p66ShcWT) or p66ShcK81R (Flag-p66ShcK81R) with and without SUMO2 (HA-SUMO2). (D) Immunoblot showing sumoylation of p66Shc in human umbilical vein endothelial cells (HUVECs) overexpressing p66ShcWT (Ad-Flag-p66ShcWT) or p66ShcK81R (Ad-p66ShcK81R) with and without SUMO2 (Ad-HA-SUMO2). (E) Immunoblot for sumoylation of recombinant p66ShcWT or p66ShcK81R. (F) Immunoprecipitation of SUMO2-p66Shc using SUMO2-p66ShcK81 antibody or the matching IgG control in HUVECs followed by immunoblotting with SUMO2-p66ShcK81 antibody showing endogenous SUMO2ylation of p66Shc (left-side panel, the high-intensity IgG signal was masked with a tape which appears as a white strip). Immunoblotting with Shc antibody in whole-cell lysate (right-side panel). Immunoblots are representative of at least three independent experiments. CH2, collagen homology 2; PTB, phosphotyrosine binding; CH1, collagen homology 1; SH2, Src homology 2.

Figure 3—source data 1

PDF file containing original western blots for Figure 3C.

https://cdn.elifesciences.org/articles/106344/elife-106344-fig3-data1-v1.zip
Figure 3—source data 2

Original files for western blot analysis displayed in Figure 3C.

https://cdn.elifesciences.org/articles/106344/elife-106344-fig3-data2-v1.zip
Figure 3—source data 3

PDF file containing original western blots for Figure 3D.

https://cdn.elifesciences.org/articles/106344/elife-106344-fig3-data3-v1.zip
Figure 3—source data 4

Original files for western blot analysis displayed in Figure 3D.

https://cdn.elifesciences.org/articles/106344/elife-106344-fig3-data4-v1.zip
Figure 3—source data 5

PDF file containing original western blots for Figure 3E.

https://cdn.elifesciences.org/articles/106344/elife-106344-fig3-data5-v1.zip
Figure 3—source data 6

Original files for western blot analysis displayed in Figure 3E.

https://cdn.elifesciences.org/articles/106344/elife-106344-fig3-data6-v1.zip
Figure 3—source data 7

PDF file containing original western blots for Figure 3F.

https://cdn.elifesciences.org/articles/106344/elife-106344-fig3-data7-v1.zip
Figure 3—source data 8

Original files for western blot analysis displayed in Figure 3F.

https://cdn.elifesciences.org/articles/106344/elife-106344-fig3-data8-v1.zip
Figure 3—figure supplement 1
Sumoylation of recombinant p66ShcWT for mass spectrometry.

(A) Coomassie stain of SDS-PAGE of recombinant p66ShcWT in its original form (not processed for SUMO2ylation), and after being SUMO2ylated and non-SUMO2ylated. (B) Silver stain of non-SUMO2ylated and SUMO2ylated recombinant p66ShcWT used for mass spectrometry.

Small ubiquitin-like modifier 2 (SUMO2) promotes p66ShcS36 phosphorylation by sumoylation of K81.

(A) Immunoblot for p66ShcS36 phosphorylation in HEK-293 cells overexpressing SUMO2 (HA-SUMO2) and p66ShcWT (Flag-p66ShcWT). (B) Quantification of p66ShcS36 phosphorylation from A. *p<0.05; n=6; one-way ANOVA. (C) Immunoblot for p66ShcS36 phosphorylation in human umbilical vein endothelial cells (HUVECs) overexpressing SUMO2 (Ad-HA-SUMO2) or p66ShcWT (Ad-Flag-p66ShcWT). (D) Quantification of p66ShcS36 phosphorylation from C. *p<0.05; n=8; one-way ANOVA. (E) Immunoblot for p66ShcS36 phosphorylation in HUVECs expressing SUMO2 (Ad-HA-SUMO2) and p66ShcWT (Ad-Flag-p66ShcWT) or p66ShcK81R (Ad-Flag-p66ShcK81R). (F) Quantification of p66ShcS36 phosphorylation from E. *p<0.05, **p<0.01; n=11; two-way ANOVA. Immunoblots were quantified with iBright image analysis software. Data represents mean ± SEM. Immunoblots are representative of at least three independent experiments.

p66ShcK81 SUMO2ylation of K81 in p66Shc promotes its translocation to the mitochondria.

(A) Immunoblot for p66ShcWT in whole-cell lysates or the mitochondrial fraction of human umbilical vein endothelial cells (HUVECs) ectopically expressing SUMO2 (Ad-HA-SUMO2) and p66ShcWT (Ad-Flag-p66ShcWT). (B) Quantification of the relative abundance of p66Shc in the mitochondria from A. **p<0.01, ****p<0.0001; n=5; one-way ANOVA. (C) Immunoblot for p66Shc in whole-cell lysates or the mitochondrial fraction of HUVECs ectopically expressing SUMO2 (Ad-HA-SUMO2) and p66ShcWT Ad-Flag-p66ShcWT or p66ShcK81R (Ad-Flag-p66ShcK81R). (D) Quantification of relative abundance of p66Shc in the mitochondria from C. *p<0.05, **p<0.01; n=7; two-way ANOVA. Data represents mean ± SEM. Immunoblots are representative of at least three independent experiments.

Figure 6 with 1 supplement
Shc1K81R are resistant to small ubiquitin-like modifier 2 (SUMO2)-induced endothelial dysfunction.

(A) DNA sequencing data from a Shc1K81R mouse showing a point mutation (A>G) resulting in an amino acid change (K→R), and insertion of silent mutation to create a digestion site for ApaI endonuclease for genotyping. (B) DNA gel electrophoresis of a PCR-amplified and ApaI-digested amplicon identifying the Shc1K81R allele. (C, D) Representative immunoblots showing SUMO2 expression in aortic rings from wild-type and Shc1K81R mice (1.67×108 pfu/ring). (E, F) Graphs showing % contraction following induction of endothelium-dependent relaxation in aortic rings from (E) wild-type mice, n=14–16 from 4 mice and (F) Shc1K81R mice (n=15–16 rings from 4 mice) expressing a control vector (Ad-Lac Z) or overexpressing SUMO2 (Ad-HA-SUMO2). (G, H) Graphs showing % contraction following induction of endothelium-independent relaxation in aortic rings from (G) wild-type (n=14–16 from 4 mice) and (H) Shc1K81R mice (n=14–15 from 4 mice) expressing a control vector (Ad-Lac Z) or overexpressing SUMO2 (Ad-HA-SUMO2). Curves were compared for nonlinear fit. ****p<0.0001. Ach, acetylcholine; SNP, sodium nitroprusside; PE, Phenylephrine; Homo, homozygous; Het, heterozygous; and NTC, No template control. Data represents mean ± SEM.

Figure 6—figure supplement 1
Physiological characterization of Shc1K81R mice.

(A) Immunoblot for p66Shc isoforms in aortic lysates from wild-type and Shc1K81R mice. (B) Body weight of Shc1K81R and wild-type mice (n=7/group). (C) Heart weight of Shc1K81R and wild-type mice (n=6/group). (D) Litter-size of Shc1K81R (n=7) and wild-type mice (n=8). Graphs showing % contraction following induction of (E) endothelium-dependent and (F) endothelium-independent relaxation in aortic rings from wild-type mice, (n=15 rings from 4 mice) and Shc1K81R mice (n=15 rings from 6 mice). Curves were compared for nonlinear fit. ***p<0.001. ns = not significant. Ach, acetylcholine; SNP, sodium nitroprusside; PE, Phenylephrine. Data represents mean ± SEM.

p66ShcK81R knock-in (KI) prevents hyperlipidemia-induced endothelial dysfunction and oxidative stress.

(A) Immunoblot showing oxidized-LDL (o-LDL)-induced changes in small ubiquitin-like modifier 2/3 (SUMO2/3)-conjugated proteins in human umbilical vein endothelial cells (HUVECs) with and without SUMO2. (B) Graph showing serum cholesterol-level in wild-type, Ldlr-/- mice on a high fat diet, and Shc1K81R mice on a high fat diet (n=4/group). One-way ANOVA, ****p<0.0001. Graphs showing % contraction following induction of endothelium-dependent relaxation (C) and endothelium-independent relaxation (D) in aortic rings from male wild-type mice, (n=14 rings from 5 mice), Ldlr-/- mice on a high fat diet (n=18 rings from 6 mice) and Ldlr-/-:: Shc1K81R mice on a high fat diet (n=12 rings from 6 mice). Two-way ANOVA. ***p<0.001. (E) Representative images showing the level of 8-OHdG in aortic section of Ldlr-/- mice on a high fat diet (n=6 mice) and Ldlr-/-:: Shc1K81R mice on a high fat diet (n=6 mice) and their (F) quantification. One-way ANOVA. *p<0.05. HFD, high fat diet; Ach, acetylcholine; SNP, sodium nitroprusside; PE, Phenylephrine; 8-OHdG, 8 hydroxy deoxyguanosine. Data represents mean ± SEM.

Figure 8 with 1 supplement
p66ShcK81 sumoylation affects multiple key regulatory pathways in endothelial cells.

(A, B) Principal component analysis (PCA) of proteins expressed in endothelial cells expressing SUMO2+p66ShcWT and SUMO2+p66ShcK81R. (C, D) Bar chart presentation of key regulatory pathways differentially affected by small ubiquitin-like modifier 2 (SUMO2)-p66ShcWT (C) and SUMO2-p66ShcK81R (D) in endothelial cells. The protein expression data (fold change) were obtained from human umbilical vein endothelial cells (HUVECs) expressing SUMO2 with p66ShcWT or p66ShcK81R compared to those expressing Ad-Lac Z. Pathway enrichment analysis (B) was performed using R-based bioinformatics tools, including PROGENy/decoupleR pathway activity inference and visualization packages. Differentially regulated pathways associated with senescence, mitochondrial dysfunction, apoptosis signaling, and angiogenesis are shown. Data were derived from a sample size of n=6.

Figure 8—figure supplement 1
P66Shck81-SUMO2ylation induced changes in signaling pathways in human umbilical vein endothelial cells (HUVECs).

(A) Representative immunoblots of endothelial cell lysate expressing Flag-p66ShcWT, Flag-p66ShcK81R, and HA-SUMO2 (n=3 shown, n=6 performed). (B) Bubble chart representation of all the regulatory pathways impacted by SUMO2-p66Shc in endothelial cells, rescued by p66ShcK81R. Pathway enrichment analysis was performed using R-based Reactome pathway analysis and visualization packages on differential protein expression data obtained from HUVECs expressing SUMO2-p66ShcWT or SUMO2-p66ShcK81R compared with Ad-LacZ controls (n=6).

Author response image 1
Amplex Red assay performed in HUVECs with and without knockdown of p66Shc expressing SUMO2 (Ad-SUMO2) or a control virus (Ad-LacZ).

Tables

Key resources table
Reagent type (species) or resourceDesignationSource or referenceIdentifiersAdditional information
Genetic reagent (Mus musculus)Shc1K81R miceThis paperShc1K81RWhole-body knock-in of Shc1K81R
Genetic reagent (M. musculus)LDLr-/- miceJaxB6.129S7-Ldlrtm1Her/JLDL receptor knockout mice
Cell line (Homo sapiens)HEK-293TATCCCat# CRL11268Shared by Dr. Dale E. Abel
Cell line (H. sapiens)HUVECpromocellCat# C1220Ordered through Fisher Scientific
Cell line (H. sapiens)HUVECLonzaCatalog #: C2519AHUVEC - Human Umbilical Vein Endothelial Cells, Pooled
Antibodyanti-SUMO2/3 (Rabbit polyclonal)Sigma-MilliporeCat# 633306WB (1:1000)
Antibodyanti-SUMO2/3 (Rabbit polyclonal)CSTCat# 4971WB (1:1000)
AntibodyAnti-GAPDHCSTCat# 2118 SWB (1:1000)
AntibodyAnti-HA (Mouse monoclonal)CSTCat# 3724 sWB (1:1000)
AntibodyAnti-His (Mouse monoclonal)CSTCat# 2366 SWB (1:1000)
AntibodyAnti-Ubc9 (Rabbit Monoclonal Antibody)CSTCat# XP 4786 sWB (1:1000)
AntibodyAnti-ShcBDCat # 610879WB (1:2000)
Antibodyanti-human phopsho-p66ShcS36 (Mouse monoclonal)AbcamCat# Ab267413WB (1:1000) (This product is discontinued from abcam)
Antibodyanti-human SUMO2-p66ShcK81 (Rabbit polyclonal)This paperYenZym, CADetects p66Shc-sumoylation on non K81 motif as well
Antibodyanti-Flag (Mouse-monoclonal)Sigma-MilliporeCat# F1804WB (1:1000)
Antibodyanti-COXIV (Rabbit monoclonal)CSTCat# 4850 SWB (1:1000)
Recombinant DNA reagentHA-SUMO2 (plasmid)This paperKumar Lab
Recombinant DNA reagentFlag-p66Shc (plasmid)This paperKumar Lab
Recombinant DNA reagentFNpCDNA3Dr. Robert OshimaAddgene plasmid # 45346
Recombinant DNA reagentFlag-p66ShcK81RThis paperKumar Lab
Recombinant DNA reagentFlag-SENP1Dr. Edward YehAddgene plasmid # 17357
Recombinant DNA reagentUbc9Dr. Edward YehAddgene plasmid # 20082
Recombinant DNA reagentAd-Flag-p66ShcWTThis paperKumar Lab
Recombinant DNA reagentAd-Flag-p66ShcK81RThis paperKumar Lab
Recombinant DNA reagentAd-HA-SUMO2This paperKumar Lab
Recombinant proteinRecombinant His-p66ShcWTThis paperKumar Lab
Recombinant proteinRecombinant His-p66ShcK81RThis paperKumar Lab
Commercial assay or kitSUMO conjugation kitEnzoBML-UW8955-0001
Commercial assay or kitTotal cholesterol assay kitCell BiolabSTA-390
OtherSpecial diet a high fat dietEnvigoTD.88317High fat diet
OtherGenotyping p66ShcK81R KI mice genotyping primer ForwardsThis paperPCR primersCTT CGG AAT GAG TCT CTG TCA TC
OtherGenotyping p66ShcK81R KI mice genotyping primer ForwardsThis paperPCR primersACC CGA ACC AAG TAG GAA ACG
Sequence-based reagentShc1Thermo FisherCatalog #: 4390815 siRNA ID: s73683Silencer Select Pre-Designed siRNA
Sequence-based reagentSUMO2Thermo FisherCatalog #: 4392421 siRNA ID: s13180Silencer Select Pre-Designed siRNA
Sequence-based reagentsiRNA: nontargeting controlThermo Fisher4390844Silencer Select
OtherMitoSOXThermo FisherM36008Mitochondrial Superoxide Indicator. Final working concentration: 2 µM
OtherH2DCFDAThermo FisherD399Indicator for reactive oxygen species Final working concentration: 25 µM

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  1. Jitendra Kumar
  2. Shravan K Uppulapu
  3. Sujata Kumari
  4. Kanika Sharma
  5. William J Paradee
  6. Ravi Prakash Yadav
  7. Vikas Kumar
  8. Santosh Kumar
(2026)
p66Shc mediates SUMO2-induced endothelial dysfunction
eLife 14:RP106344.
https://doi.org/10.7554/eLife.106344.3