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Journal of Experimental Biology 150,95-109 (1990)
Published by Company of Biologists 1990

The Regulation of Intracellular pH Estimated by ³¹P-NMR Spectroscopy in the Anterior Byssus Retractor Muscle of Mytilus Edulis L

J. ZANGE ¹, M. K. GRIESHABER ², and A. W. JANS ¹

¹ Max-Planck-Institut für Systemphysiologie, Rheinlanddamm 201, 4600 Dortmund, FRG
² Zoologisches Institut, Lehrstuhl für Tierphysiologie, Heinrich-Heine-Universität Universitätsstrasse 1, 4000 Dsseldorf, FRG

The regulation of the intracellular 6 (pHi) in the anterior byssus retractor muscle (ABRM) of Mytilus edulis L. during an acidic and alkaline load was studied by ³¹P-NMR spectroscopy. Under aerobic conditions, a total intracellular buffer capacity of 26.5±0.7mmoll^-1 pH unit^-1 (N=3) was estimated. In the absence of serotonin, active acid extrusion was by a Na⁺-independent, primary active transport mechanism coupled to anion transport. Base equivalents appear to be extruded by a Cl^-/HCO₃^- exchanger. Serotonin (10^-5 moll^-1) induced an increase in pHi through additional activation of a Na⁺/H⁺ exchanger.

Key words: ABRM, intracellular pH, serotonin, sodium/proton exchange, chloride/icarbonate exchange.

Accepted on December 13, 1989