| Registro completo |
| Provedor de dados: |
Neotropical Ichthyology
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| País: |
Brazil
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| Título: |
NTPDase and acetylcholinesterase activities in silver catfish, Rhamdia quelen (Quoy & Gaimard, 1824) (Heptapteridae) exposed to interaction of oxygen and ammonia levels
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| Autores: |
Kaizer,Rosilene Rodrigues
Loro,Vania Lúcia
Schetinger,Maria Rosa Chitolina
Morsch,Vera Maria
Tabaldi,Luciane Almeri
Rosa,Cíntia Saydelles da
Garcia,Luciano de Oliveira
Becker,Alexssandro G.
Baldisserotto,Bernardo
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| Data: |
2009-01-01
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| Ano: |
2009
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| Palavras-chave: |
Fish
ATP
ADP
AChE
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| Resumo: |
The effects of various levels of oxygen saturation and ammonia concentration on NTPDase (ecto-nucleoside triphosphate diphosphohydrolase, E.C. 3.6.1.5) and acetylcholinesterase (AChE, E.C. 3.1.1.7) activities in whole brain of teleost fish (Rhamdia quelen) were investigated. The fish were exposed to one of two different dissolved oxygen levels, including high oxygen (6.5 mg.L-1) or low oxygen (3.5 mg.L-1), and one of two different ammonia levels, including high ammonia (0.1 mg.L-1) or low ammonia (0.03 mg.L-1) levels. The four experimental groups included the following (A) control, or high dissolved oxygen plus low NH3; (B) low dissolved oxygen plus low NH3; (C) high dissolved oxygen plus high NH3; (D) low dissolved oxygen plus high NH3. We found that enzyme activities were altered after 24 h exposure in groups C and D. ATP and ADP hydrolysis in whole brain of fish was enhanced in group D after 24 h exposure by 100% and 119%, respectively, compared to the control group. After 24 h exposure, AChE activity presented an increase of 34% and 39% in groups C and D, respectively, when compared to the control group. These results are consistent with the hypothesis that low oxygen levels increase ammonia toxicity. Moreover, the hypoxic events may increase blood flow by hypoxia increasing NTPDase activity, thus producing adenosine, a potent vasodilator.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400012
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| Editor: |
Sociedade Brasileira de Ictiologia
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| Relação: |
10.1590/S1679-62252009000400012
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| Formato: |
text/html
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| Fonte: |
Neotropical Ichthyology v.7 n.4 2009
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| Direitos: |
info:eu-repo/semantics/openAccess
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