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Titolo:
The loach Misgurnus anguillicaudatus reduces amino acid catabolism and accumulates alanine and glutamine during aerial exposure
Autore:
Chew, SF; Jin, Y; Ip, YK;
Indirizzi:
Nanyang Technol Univ, Natl Inst Educ, Nat Sci Acad Grp, Singapore 637616, Singapore Nanyang Technol Univ Singapore Singapore 637616 gapore 637616, Singapore Natl Univ Singapore, Dept Biol Sci, Singapore 117543, Singapore Natl Univ Singapore Singapore Singapore 117543 ngapore 117543, Singapore
Titolo Testata:
PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY
fascicolo: 2, volume: 74, anno: 2001,
pagine: 226 - 237
SICI:
1522-2152(200103/04)74:2<226:TLMARA>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
ONCORHYNCHUS-CLARKI-HENSHAWI; LAKE MAGADI TILAPIA; UREA EXCRETION; SQUALUS-ACANTHIAS; SUBCELLULAR-LOCALIZATION; ALKALINE ENVIRONMENT; CARBAMOYL-PHOSPHATE; NITROGEN-METABOLISM; OPSANUS-BETA; FRESH-WATER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Chew, SF Nanyang Technol Univ, Natl Inst Educ, Nat Sci Acad Grp, 1 NanyangWalk, Singapore 637616, Singapore Nanyang Technol Univ 1 Nanyang Walk Singapore Singapore 637616 e
Citazione:
S.F. Chew et al., "The loach Misgurnus anguillicaudatus reduces amino acid catabolism and accumulates alanine and glutamine during aerial exposure", PHYSIOL B Z, 74(2), 2001, pp. 226-237

Abstract

The loach Misgurnus anguillicaudatus inhabits rice fields in Southern China. It encounters drought during summer and ammonia loading during agricultural fertilization. In the laboratory, aerial exposure led to decreases in its ammonia and urea excretion. Ammonia accumulated to very high levels in the muscle and liver. Urea synthesis through the ornithine-urea cycle was not involved in ammonia detoxification in M. anguillicaudatus. However, M. anguillicaudatus was capable of partial amino acid catabolism leading to the accumulation of alanine in the first 24 h of aerial exposure. This was apparently coupled to a possible decrease in protein/amino acid catabolism. These are not detoxification mechanisms but mechanisms that avoid internal fouling by ammonia. Misgurnus anguillicaudatus was also capable of detoxifyinginternally produced ammonia in part to glutamine, which appears to be an important adaptation after 24 h of aerial exposure. However, unlike the caseof the marble goby (Oxyeleotris marmoratus), there was no alteration to the kinetic properties of the hepatic glutamine synthetase. During dry seasons, M. anguillicaudatus moves actively on land until it encounters soft mud in which it can bury itself through several strong wriggling actions of thebody. Hence, it is possible that M. anguillicaudatus uses partial amino acid catabolism to fuel its short period of activities on land and switches to the formation of glutamine to detoxify internally produced ammonia when it remains relatively inactive in the mud.

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Documento generato il 02/04/20 alle ore 21:02:41