ArticleCellular and molecular life sciences : CMLS2026
TMEM16E-mediated macropinocytosis promotes cell survival under acidic stress.
Article in Cellular and molecular life sciences : CMLS, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
TMEM16E is a transmembrane protein that functions both as a phospholipid scramblase and a non-selective ion channel, playing a critical role in cellular ion transport and membrane dynamics. Recent studies have shown that the TMEM16E scramblase also facilitates membrane internalization through macropinocytosis. This study investigates the effects of extracellular protons on TMEM16E's scrambling activity and subsequent macropinocytosis under acidic conditions, which are particularly relevant in pathophysiological contexts such as muscular dystrophies and cancers. Our results indicate that TMEM16E-induced macropinocytosis, as evidenced by the internalization of annexin V, is significantly enhanced in acidic environments (pH 5.5). However, the overall number of macropinosomes, assessed using 70 kDa dextran, remained unchanged despite variations in extracellular pH. This suggests that TMEM16E-mediated macropinocytosis operates independently of extracellular proton concentrations. Upon extracellular acidification, both TMEM16E scrambling activity and macropinocytosis were rapidly inhibited, leading to a swift decrease in intracellular Ca
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