| Hypoxia-inducible carbonic anhydrase IX expression is insufficient to alleviate intracellular metabolic acidosis in the muscle of zebrafish, Danio rerio. | |
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MedLine Citation:
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PMID: 18945954 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Recent evidence suggests that carbonic anhydrase (CA) IX in humans is under the regulatory control of hypoxia-inducible factor and is overexpressed in certain cancers. However, little is known of its presence in nonmammalian vertebrates or its physiological function in any vertebrate. The objective of this study was to examine and characterize the presence, distribution, induction by hypoxia, and physiological function of CA IX in the zebrafish. Zebrafish CA IX was highly expressed in the eye, brain, and gastrointestinal tract and showed increased expression in the eye, brain, and muscle in response to hypoxia (water Po(2) = 24 mmHg). The hypothesis that increased CA IX expression during hypoxia would act to attenuate intracellular acidosis was then examined. Muscle intracellular pH (pH(i)) decreased after 4 h of hypoxic exposure (from 7.15 +/- 0.02 to 7.06 +/- 0.01 pH units) and did not recover by 24 h. Manipulation of extracellular CA activity via intraperitoneal injection of either bovine CA or the selective extracellular CA inhibitor F3500 revealed that although increased CA activity could fully restore pH(i), removal of extracellular activity did not result in further acidosis. An exercise-induced acidosis was also attenuated in fish treated with bovine CA; however, the increased extracellular CA expression resulting from hypoxia had no affect. These data suggest that although extracellular CA can potentially minimize the impact of hypoxia on muscle pH(i), the actual level of extracellular CA activity is likely insufficient to achieve this goal, even when enhanced by hypoxia-induced increases in CA IX expression. |
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Authors:
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Andrew J Esbaugh; S F Perry; K M Gilmour |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-10-22 |
Journal Detail:
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Title: American journal of physiology. Regulatory, integrative and comparative physiology Volume: 296 ISSN: 0363-6119 ISO Abbreviation: Am. J. Physiol. Regul. Integr. Comp. Physiol. Publication Date: 2009 Jan |
Date Detail:
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Created Date: 2008-12-30 Completed Date: 2009-02-06 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100901230 Medline TA: Am J Physiol Regul Integr Comp Physiol Country: United States |
Other Details:
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Languages: eng Pagination: R150-60 Citation Subset: IM |
Affiliation:
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Dept. of Biology and Centre for Advanced Research in Environmental Genomics, Univ. of Ottawa, Ottawa, Ontario, Canada K1N 6N5. aesbaugh@uottawa.ca |
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| MeSH Terms | |
Descriptor/Qualifier:
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Acid-Base Equilibrium*
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drug effects Acidosis / enzymology* Animals Anoxia / enzymology* Brain / enzymology Carbonic Anhydrase Inhibitors / administration & dosage Carbonic Anhydrases / administration & dosage, biosynthesis*, chemistry, genetics Cattle Enzyme Induction Eye / enzymology Fish Proteins / biosynthesis*, chemistry, genetics Gastrointestinal Tract / enzymology Hydrogen-Ion Concentration Injections, Intraperitoneal Muscle, Skeletal / drug effects, enzymology* Phylogeny Polyethylene Glycols / administration & dosage RNA, Messenger / biosynthesis Response Elements Thiadiazoles / administration & dosage Time Factors Zebrafish / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Carbonic Anhydrase Inhibitors; 0/F 3500; 0/Fish Proteins; 0/Polyethylene Glycols; 0/RNA, Messenger; 0/Thiadiazoles; EC 4.2.1.1/Carbonic Anhydrases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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