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Article: The sleeper Bostrichthys sinensis (Family eleotridae) stores glutamine and reduces ammonia production during aerial exposure

TitleThe sleeper Bostrichthys sinensis (Family eleotridae) stores glutamine and reduces ammonia production during aerial exposure
Authors
KeywordsAerial exposure
Ammonia production
Bostrichthys sinensis
Glutamine
Issue Date2001
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00360/index.htm
Citation
Journal Of Comparative Physiology - B Biochemical, Systemic, And Environmental Physiology, 2001, v. 171 n. 5, p. 357-367 How to Cite?
AbstractBostrichthys sinensis inhabits brackish water, living in the crevices of the river mouths of Shang Xi and Guangdong, China. In its natural habitat, it may encounter aerial exposure frequently during low tides, and it usually remains quiescent in the absence of water. Upon aerial exposure in the laboratory, the ammonia excretion rate decreased to one-fourth that of the submerged control. Although all the enzymes of the ornithine-urea cycle were detected in the liver of this fish, the activity of hepatic carbamoyl phosphate synthetase was too low for the cycle to be functioning. Indeed, ammonia accumulated in the tissues and was not converted to urea. Results indicate that ammonia produced through amino acid catabolism was detoxified to glutamine during the first 24 h of aerial exposure. The excess amount of glutamine stored in the muscle during this period couldaccount approximately for the reduction in ammonia equivalent excreted. There was indeed a significant increase in the activity of glutamine synthetase from the liver of specimens exposed to terrestrial conditions. In contrast to the production of alanine, formation of glutamine is energetically expensive. Since B. sinensis remained relatively inactive on land, the reduction in energy demand for muscular activity might provide it with the opportunity to exploit glutamine formation as a means to detoxify ammonia. After 72 h of aerial exposure, B. sinensis reduced internal ammonia production, possibly through reductions in proteolysis and amino acid catabolism, to avoid excessive accumulation of ammonia.
Persistent Identifierhttp://hdl.handle.net/10722/92761
ISSN
2015 Impact Factor: 1.884
2015 SCImago Journal Rankings: 1.126
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorIp, YKen_HK
dc.contributor.authorChew, SFen_HK
dc.contributor.authorLeong, IAWen_HK
dc.contributor.authorJin, Yen_HK
dc.contributor.authorLim, CBen_HK
dc.contributor.authorWu, RSSen_HK
dc.date.accessioned2010-09-17T10:56:23Z-
dc.date.available2010-09-17T10:56:23Z-
dc.date.issued2001en_HK
dc.identifier.citationJournal Of Comparative Physiology - B Biochemical, Systemic, And Environmental Physiology, 2001, v. 171 n. 5, p. 357-367en_HK
dc.identifier.issn0174-1578en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92761-
dc.description.abstractBostrichthys sinensis inhabits brackish water, living in the crevices of the river mouths of Shang Xi and Guangdong, China. In its natural habitat, it may encounter aerial exposure frequently during low tides, and it usually remains quiescent in the absence of water. Upon aerial exposure in the laboratory, the ammonia excretion rate decreased to one-fourth that of the submerged control. Although all the enzymes of the ornithine-urea cycle were detected in the liver of this fish, the activity of hepatic carbamoyl phosphate synthetase was too low for the cycle to be functioning. Indeed, ammonia accumulated in the tissues and was not converted to urea. Results indicate that ammonia produced through amino acid catabolism was detoxified to glutamine during the first 24 h of aerial exposure. The excess amount of glutamine stored in the muscle during this period couldaccount approximately for the reduction in ammonia equivalent excreted. There was indeed a significant increase in the activity of glutamine synthetase from the liver of specimens exposed to terrestrial conditions. In contrast to the production of alanine, formation of glutamine is energetically expensive. Since B. sinensis remained relatively inactive on land, the reduction in energy demand for muscular activity might provide it with the opportunity to exploit glutamine formation as a means to detoxify ammonia. After 72 h of aerial exposure, B. sinensis reduced internal ammonia production, possibly through reductions in proteolysis and amino acid catabolism, to avoid excessive accumulation of ammonia.en_HK
dc.languageengen_HK
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00360/index.htmen_HK
dc.relation.ispartofJournal of Comparative Physiology - B Biochemical, Systemic, and Environmental Physiologyen_HK
dc.subjectAerial exposureen_HK
dc.subjectAmmonia productionen_HK
dc.subjectBostrichthys sinensisen_HK
dc.subjectGlutamineen_HK
dc.titleThe sleeper Bostrichthys sinensis (Family eleotridae) stores glutamine and reduces ammonia production during aerial exposureen_HK
dc.typeArticleen_HK
dc.identifier.emailWu, RSS: rudolfwu@hku.hken_HK
dc.identifier.authorityWu, RSS=rp01398en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s003600100184en_HK
dc.identifier.pmid11497123-
dc.identifier.scopuseid_2-s2.0-0034933299en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034933299&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume171en_HK
dc.identifier.issue5en_HK
dc.identifier.spage357en_HK
dc.identifier.epage367en_HK
dc.identifier.isiWOS:000169654800002-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridIp, YK=7006740134en_HK
dc.identifier.scopusauthoridChew, SF=7202524632en_HK
dc.identifier.scopusauthoridLeong, IAW=6603775034en_HK
dc.identifier.scopusauthoridJin, Y=7404458136en_HK
dc.identifier.scopusauthoridLim, CB=7403654147en_HK
dc.identifier.scopusauthoridWu, RSS=7402945079en_HK

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