Sodium and chloride transport across the molluscan gut.
1. Na+ absorption across Aplysia gut was mediated by a Na+/K+-ATPase located in the enterocyte basolateral membrane. 2. In the absence of Na+ in the bathing medium, net Cl- absorption across Aplysia gut wall was identical to the SCC. 3. Intracellular Cl- was at a lower electrochemical potential in Aplysia enterocytes than in either the mucosal or serosal medium. 4. Cl--stimulated ATPase activity was localized in the basolateral membrane of Aplysia enterocytes. 5. ATP-dependent Cl- transport was localized in the basolateral membrane of Aplysia enterocytes. 6. In Aplysia gut primary active transport systems for both Na+ and Cl- are postulated based on the evidence presented.
D000818:Animals; D001048:Aplysia / Q000502:physiology*; D001692:Biological Transport; D002712:Chlorides / Q000378:metabolism*; D004068:Digestive System Physiological Phenomena; D012964:Sodium / Q000378:metabolism*
D002712:Chlorides; D012964:Sodium