Respiration rates, ATP content and ionic regulation in hepatocytes of starving lamprey during the pre-spawning period of their life cycle

During the winter pre-spawning migration, lampreys Lampetra fluviatilis stop feeding, and their liver metabolism is reduced substantially. Aerobic ATP production in hepatocytes decreased to one third and ATP content decreased by 50% as compared with the values in autumn. In spite of the decrease of...

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Bibliographic Details
Published in:Journal of fish biology 2001, Vol.58 (1), p.230-239
Main Authors: GAMPER, N. L, SAVINA, M. V, BRAILOVSKAYA, I. V, VERENINOV, A. A
Format: Article
Language:English
Subjects:
Lampetra fluviatilis
Marine
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Summary:During the winter pre-spawning migration, lampreys Lampetra fluviatilis stop feeding, and their liver metabolism is reduced substantially. Aerobic ATP production in hepatocytes decreased to one third and ATP content decreased by 50% as compared with the values in autumn. In spite of the decrease of endogenous and phosphorylating (oligomycin-sensitive) respiration in winter, the oxygen consumption used to drive sodium and potassium pumping through Na,K-ATPase activity (ouabain-sensitive respiration) remained virtually constant. Consequently its share in phosphorylating respiration increased from 16.3% in November to 54.2% in February. Potassium influx was similar within the range of ATP content between 2.5 and 1 nmol 10 super(-6)cells and decreases only in hepatocytes which contained
ISSN:0022-1112
1095-8649
DOI:10.1006/jfbi.2000.1442