Increased H+ efflux is sufficient to induce dysplasia and necessary for viability with oncogene expression

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Abstract

Intracellular pH (pHi) dynamics is increasingly recognized as an important regulator of a range of normal and pathological cell behaviors. Notably, increased pHi is now acknowledged as a conserved characteristic of cancers and in cell models is confirmed to increases proliferation and migration as well as limits apoptosis. However, the significance of increased pHi for cancer in vivo remains unresolved. Using Drosophila melanogaster, we show that increased pHi is sufficient to induce dysplasia in the absence of other transforming cues and potentiates growth and invasion with oncogenic Ras. Using a genetically encoded biosensor we also confirm increased pHi in situ. Moreover, in Drosophila models and clonal human mammary cells we show that limiting H⁺ efflux with oncogenic Raf or Ras induces acidosis and synthetic lethality. Further, we show lethality in invasive, primary tumor cell lines with inhibiting H⁺ efflux. Synthetic lethality with reduced H⁺ efflux and activated oncogene expression could be exploited therapeutically to restrain cancer progression while limiting off-target effects.

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Bree K Grillo-Hill

Department of Cell and Tissue Biology, University of California, San Francisco, San Francisco, United States

Competing interests
The authors declare that no competing interests exist.
Changhoon Choi

Department of Cell and Tissue Biology, University of California, San Francisco, San Francisco, United States

Competing interests
The authors declare that no competing interests exist.
Maite Jimenez-Vidal

Department of Cell and Tissue Biology, University of California, San Francisco, San Francisco, United States

Competing interests
The authors declare that no competing interests exist.
Diane L Barber

Department of Cell and Tissue Biology, University of California, San Francisco, San Francisco, United States

For correspondence
diane.barber@ucsf.edu

Competing interests
The authors declare that no competing interests exist.

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