Abstract
Both cellular proliferation and apoptosis (programmed cell death) have been claimed to be modulated, perhaps even triggered by, changes in intracellular pH. In this review, we summarize the evidence that gave rise to these hypotheses. To facilitate a critical appraisal of the existing data, we briefly review the main pathways involved in cytosolic pH homeostasis and their regulation by mitogens and by apoptosis-inducing agents. The information available at present suggests that cytosolic pH plays a permissive role in cellular growth and proliferation, but is neither a trigger nor an essential step in the mitogenic signal transduction cascade. Concerning apoptosis, it is clear that lowering the pH in vitro can activate DNase II. However, the evidence linking cytosolic acidification with DNA degradation in vivois presently not convincing. We conclude that the cytosolic pH, an essential physiological parameter that is tightly controlled by multiple, complementary, or redundant systems, is unlikely to play a role in signalling either cell growth or death.
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Shrode, L.D., Tapper, H. & Grinstein, S. Role of Intracellular pH in Proliferation, Transformation, and Apoptosis. J Bioenerg Biomembr 29, 393–399 (1997). https://doi.org/10.1023/A:1022407116339
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DOI: https://doi.org/10.1023/A:1022407116339