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Titolo:
METABOLISM AND ENERGETICS IN SQUID (ILLEX-ILLECEBROSUS, LOLIGO-PEALEI) DURING MUSCULAR FATIGUE AND RECOVERY
Autore:
PORTNER HO; WEBBER DM; ODOR RK; BOUTILIER RG;
Indirizzi:
ALFRED WEGENER INST POLAR & MARINE RES,COLUMBUSSTR POSTFACH 12-01-61 W-2850 BREMERHAVEN GERMANY DALHOUSIE UNIV,DEPT BIOL HALIFAX B3H 4J1 NS CANADA UNIV CAMBRIDGE,DEPT ZOOL CAMBRIDGE CB2 3EJ ENGLAND
Titolo Testata:
The American journal of physiology
fascicolo: 1, volume: 265, anno: 1993,
parte:, 2
pagine: 180000157 - 180000165
SICI:
0002-9513(1993)265:1<180000157:MAEIS(>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-ENERGY PHOSPHATE; ACID-BASE REGULATION; ANAEROBIC METABOLISM; ENVIRONMENTAL HYPOXIA; NITRILOTRIACETIC ACID; MARINE-INVERTEBRATES; NITROGEN-EXCRETION; BIOLOGICAL ROLE; MANTLE MUSCLE; PH REGULATION;
Keywords:
AEROBIC AND ANAEROBIC ENERGY PRODUCTION; ALANINE; AMMONIUM; CEPHALOPOD MUSCLE; FREE ADENOSINE 5'-DIPHOSPHATE; FREE ADENOSINE 5'-MONOPHOSPHATE; FREE ENERGY CHANGE OF ADENOSINE 5'-TRIPHOSPHATE HYDROLYSIS; ALPHA-GLYCEROPHOSPHATE; INORGANIC PHOSPHATE; INTRACELLULAR PH; OCTOPINE; PROLINE; PHOSPHO-L-ARGININE; SUCCINATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
H.O. Portner et al., "METABOLISM AND ENERGETICS IN SQUID (ILLEX-ILLECEBROSUS, LOLIGO-PEALEI) DURING MUSCULAR FATIGUE AND RECOVERY", The American journal of physiology, 265(1), 1993, pp. 180000157-180000165

Abstract

The concentrations of intermediate and end products of anaerobic energy metabolism and of free amino acids were determined in mantle musculature and blood sampled from cannulated, unrestrained squid (Loligo pealei, Illex illecebrosus) under control conditions, after fatigue fromincreasing levels of exercise, and during postexercise recovery. Phosphagen depletion, accumulation of octopine (more so in Illex than in Loligo), and accumulation of succinate indicate that anaerobic metabolism contributes to energy production before fatigue. Proline was a substrate of metabolism in Loligo, as indicated by its depletion in the mantle. In both species, there was no evidence of catabolism of ATP beyond AMP. A comparison of the changes in the free and total levels of adenylates and the phosphagen indicates an earlier detrimental effect offatigue on the energy status in Loligo. The acidosis provoked by octopine formation in Illex was demonstrated to promote the use of the phosphagen and to protect the free energy change of ATP such that the anaerobic scope of metabolism during swimming is extended and expressed more in Illex than in Loligo. In both species, there was no decrease inthe sum of phospho-L-arginine, octopine, and L-arginine, and thus no release of octopine from the mantle, thereby supporting our earlier claim that octopine and associated protons are recycled in the mantle tissue. Overall, the metabolic strategy of Loligo is much less disturbing for the acid-base status. This strategy and the alternative strategyof Illex to keep acidifying protons in the tissue may be important for the protection of hemocyanin function in the two species.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 05:42:39