Apical recycling of the gastric parietal cell H,K-ATPase.
The gastric parietal cell was the first system where a regulated membrane recycling hypothesis was proposed as the principal means for moving molecular transporters between cellular compartments. Upon stimulation, massive membrane flow from an endosomal compartment of tubulovesicle membranes to the apical secretory surface places the ATP-driven pumps in position to secrete a solution of strong acid in collaboration with several other membrane transporters. This review focuses on the membrane recycling pathway and proteins that support the recruitment and redistribution of H,K-ATPase-rich membranes, including those involved in signal transduction, membrane targeting, docking, and fusing, in addition to the integral role of the actin cytoskeleton and its associated proteins in the process of membrane recycling. Although much of the evidence discussed here comes from parietal cell studies, other physiological transport systems, as well as less complex cellular and in vitro models, are examined and cited for generality of principle.
Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA. jforte@berkeley.edu
John G
JG
Forte
Lixin
L
Zhu
D000818:Animals; D002462:Cell Membrane / Q000378:metabolism / Q000502:physiology; D004705:Endocytosis / Q000502:physiology; D005744:Gastric Acid / Q000378:metabolism; D015971:Gene Expression Regulation, Enzymologic / Q000502:physiology; D017506:H(+)-K(+)-Exchanging ATPase / Q000378:metabolism*; D006801:Humans; D010295:Parietal Cells, Gastric / Q000201:enzymology*; D050600:SNARE Proteins / Q000378:metabolism / Q000502:physiology; D015398:Signal Transduction / Q000502:physiology; D020691:rab GTP-Binding Proteins / Q000502:physiology
D050600:SNARE Proteins; D017506:H(+)-K(+)-Exchanging ATPase; D020691:rab GTP-Binding Proteins