Endosomal pH

Endosomal pH refers to the acidic pH environment within endosomes, which is dynamically regulated during endosome maturation and is essential for functions such as cargo degradation, receptor recycling, vesicle trafficking, and cellular signaling[3][4]. Acidification is driven mainly by the vacuolar-type H^+-ATPase (V-ATPase), with additional regulation by Na^+/H^+ exchangers (such as NHE6, NHE9), Na^+/K^+-ATPase, and chloride channels[1][2][4][5][6]. Disruption of endosomal pH homeostasis can result in impaired protein and membrane trafficking, altered cell signaling, and pathophysiological states including neurodegeneration, infection susceptibility, and cancer[6][10]. While pH itself is not a protein or gene, its regulation represents a potential therapeutic strategy by targeting the responsible molecular machinery such as V-ATPase or endosomal Na^+/H^+ exchangers[4][6][10].

Other names

Endosomal acidificationEndosomal luminal pHEndosomal hydrogen ion concentration

Inhibition or alteration of vesicular acidification (e.g. by V-ATPase or Na^+/K^+-ATPase inhibition)[1][4]; Alkalinization of acidic organelles (e.g. by weak bases such as chloroquine)[2][6]