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Titolo:
PLASTICITY OF FISH MUSCLE MITOCHONDRIA WITH THERMAL-ACCLIMATION
Autore:
GUDERLEY H; JOHNSTON IA;
Indirizzi:
UNIV LAVAL,DEPT BIOL QUEBEC CITY PQ G1K 7P4 CANADA UNIV ST ANDREWS,GATTY MARINE LAB ST ANDREWS FIFE SCOTLAND
Titolo Testata:
Journal of Experimental Biology
fascicolo: 6, volume: 199, anno: 1996,
pagine: 1311 - 1317
SICI:
0022-0949(1996)199:6<1311:POFMMW>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
STATE-III RESPIRATION; CYPRINUS-CARPIO L; TEMPERATURE-ACCLIMATION; BIOLOGICAL-MEMBRANES; DIFFUSION DISTANCES; LIPID-COMPOSITION; FIBER TYPES; ADAPTATION; GOLDFISH; METABOLISM;
Keywords:
ACCLIMATION; SKELETAL MUSCLE; MITOCHONDRIA; SHORT-HORNED SCULPIN; MYOXOCEPHALUS SCORPIUS; TEMPERATURE; MAXIMAL CAPACITIES; ADP AFFINITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
H. Guderley e I.A. Johnston, "PLASTICITY OF FISH MUSCLE MITOCHONDRIA WITH THERMAL-ACCLIMATION", Journal of Experimental Biology, 199(6), 1996, pp. 1311-1317

Abstract

Short-horned sculpin Myoxocephalus scorpius were acclimated to 5 and 15 degrees C to evaluate the impact of thermal acclimation upon maximal rates of substrate oxidation by mitochondria and upon the thermal sensitivity of their ADP affinity, Cold acclimation virtually doubled maximal rates of pyruvate oxidation at all experimental temperatures (2.5, 7.5, 12.5 and 20 degrees C). Rates of palmitoyl carnitine oxidationwere also enhanced by cold acclimation, but to a lesser degree. At their respective acclimation temperatures, the mitochondria attained similar rates of pyruvate oxidation. For warm-acclimated sculpin, the Q(10) values for mitochondrial pyruvate and palmitoyl carnitine oxidationwere higher between 2.5 and 7.5 degrees C than between 7.5 and 12.5 degrees C or between 12.5 and 20 degrees C. In contrast, for cold-acclimated fish, the Q(10) values did not differ over these thermal ranges. The Arrhenius activation energy for pyruvate oxidation was reduced bycold acclimation (from 70 to 55 kJ mol(-1)), whereas that for palmitoyl carnitine oxidation was unchanged (approximately 75 kJ mol(-1)). Cold acclimation did not alter the ADP affinity of mitochondria at low temperatures but markedly increased the apparent K-m for ADP (K-m,K-app) at 12.5 and 20 degrees C. At the acclimation temperatures, mitochondrial ADP K-m,K-app values did not differ. The loss of ADP affinity at higher temperatures may represent a cost of the enhanced maximal oxidative capacity achieved during cold acclimation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 15:19:31