Summary
Active buffer transport, e.g. H+-secretion by stomach and kidney and HCO −3 -secretion by pancreas and salivary glands, is linked with the presence of a HCO −3 stimulated ATP-Phosphohydrolase. In contrast to (Na+-K−)-ATPase which is considered to be equivalent to the Na+ pump, the HCO −3 -ATPase requires onlyone ion for activation and is insensitive to ouabain. The HCO −3 -ATPase is found in the plasma membrane of the epithelia, but in contrast to the (Na+-K+)-ATPase it is located in the luminal cell border. The activity of the HCO −3 -ATPase changes in parallel along with the rate of active buffer transport, a finding which underlines its importance as a transport enzyme. Several disorders of buffer transport are described which are possibly associated with a defect of the HCO −3 -ATPase system.
Zusammenfassung
Dem aktiven Puffertransport, der an Magen und Niere zur H+-Sekretion, am Pankreas und Speicheldrüse zur HCO −3 -Sekretion führt, ist eine ATP-Phosphohydrolase zugeordnet, die typischerweise durch HCO −3 -Ionen stimuliert wird. Im Gegensatz zur (Na+-K+)-ATPase, dem Transportenzym des Na+-Transportes, benötigt dieses Enzym nurein Ion und ist Ouabain unempfindlich. Die HCO −3 -ATPase ist an die Plasmamembran der einzelnen Epithelien gebunden, jedoch im Gegensatz zur (Na+-K+)-ATPase luminal lokalisiert. Das Enzym ändert seine Aktivität proportional zur Rate des aktiven Puffertransportes, was seine Bedeutung als Transportenzym unterstreicht. Es werden Krankheitsbilder des gestörten Puffertransportes aufgeziegt, bei denen möglicherweise der Defekt im HCO −3 -ATPase-System zu suchen ist.
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Simon, B., Knauf, H. Die Bedeutung der HCO −3 -ATPase in der H+/HCO −3 -Sekretion. Klin Wochenschr 54, 97–104 (1976). https://doi.org/10.1007/BF01468786
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DOI: https://doi.org/10.1007/BF01468786
Key words
- H+-secretion, stomach, kidney
- HCO −3 -secretion, pancreas, salivary glands
- membrane-bound HCO −3 -ATPase
- pathology of buffer transport