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Titolo:
Seasonal cycles of mitochondrial ADP sensitivity and oxidative capacities in trout oxidative muscle
Autore:
Guderley, H; St Pierre, J;
Indirizzi:
Univ Laval, Dept Biol, Quebec City, PQ G1K 7P4, Canada Univ Laval Quebec City PQ Canada G1K 7P4 Quebec City, PQ G1K 7P4, Canada
Titolo Testata:
JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTALPHYSIOLOGY
fascicolo: 7, volume: 169, anno: 1999,
pagine: 474 - 480
SICI:
0174-1578(199910)169:7<474:SCOMAS>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
STATE-III RESPIRATION; ATP TURNOVER RATES; CYPRINUS-CARPIO L; RAINBOW-TROUT; ACCLIMATION TEMPERATURE; THERMAL-ACCLIMATION; BIOLOGICAL-MEMBRANES; ONCORHYNCHUS-MYKISS; FISH MUSCLE; RED MUSCLE;
Keywords:
mitochondria; temperature; muscle; seasonal acclimatisation; trout;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Guderley, H Univ Laval, Dept Biol, Quebec City, PQ G1K 7P4, Canada Univ Laval Quebec City PQ Canada G1K 7P4 , PQ G1K 7P4, Canada
Citazione:
H. Guderley e J. St Pierre, "Seasonal cycles of mitochondrial ADP sensitivity and oxidative capacities in trout oxidative muscle", J COMP PH B, 169(7), 1999, pp. 474-480

Abstract

Mitochondria from red myotomal muscle of rainbow trout, Oncorhynchus mykiss, showed seasonal cycles of their maximal rates of substrate oxidation (nmol.min(-1).mg(-1) mitochondrial protein) and their apparent ADP affinity (Km(app)), as well as in the thermal sensitivity of these properties. Increases in the maximal capacity of pyruvate oxidation were sufficient to compensate for seasonal changes in temperature, except during the winter months when rates at habitat temperature were depressed relative to other periods. The ADP affinity of isolated mitochondria was highest during cold months. Thus, the Km(app) for ADP at habitat temperature showed less seasonal variation than the ADP Km(app) at a given temperature. A loss in ADP affinity withdecreasing temperature occurred through much of the year, and only was definitively suppressed in December and July. Both the ADP affinity and the maximal oxidative capacities of muscle mitochondria seem to be regulated parameters.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 00:50:59