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Inhibition and labeling of the rat renal Na+/H+-exchanger by an antagonist of muscarinic acetylcholine receptors

MPG-Autoren
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Burckhardt,  Gerhard
Department of Physiology, Max Planck Institute of Biophysics, Max Planck Society;

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Zitation

Friedrich, T., & Burckhardt, G. (1988). Inhibition and labeling of the rat renal Na+/H+-exchanger by an antagonist of muscarinic acetylcholine receptors. Biochemical and Biophysical Research Communications, 157(3), 921-929. doi:10.1016/S0006-291X(88)80962-8.


Zitierlink: https://hdl.handle.net/21.11116/0000-0007-4B4A-3
Zusammenfassung
A covalently binding label for muscarinic acetylcholine receptors, propylbenzilylcholine mustard (PrBCM), irreversibly inhibits the Na+/H+ exchanger in rat renal brush-border membrane vesicles. Substrates of the antiporter, Na+ and Li+, as well as inhibitors, amiloride, 5-(N-ethyl-N-isopropyl)amiloride (EIPA) and propranolol, protect the antiporter from inactivation by PrBCM. With [3H]PrBCM a band with an app. Mr of 65 kDa is predominantly labeled. Amiloride protects this band from labeling with [3H]PrBCM and [14C]-N,N′-dicyclohexylcarbodiimide (DCCD) proving its identity with the renal Na+/H+ exchanger. Our data reveal a specific interaction of PrBCM with the Na+/H+ exchanger and suggest structural relations between antiporter and receptors.