Effect of calcium deficiency on acyl-CoA synthetase activity in microsomes from various rat tissues
Acta physiol. pharmacol. ther. latinoam
; 49(3): 134-40, 1999. tab, graf
Article
em En
| LILACS
| ID: lil-246051
Biblioteca responsável:
BR1.1
RESUMO
The specific activity of long-chain acyl-CoA synthetase in microsomes from various tissues of control and calcium-deficient rats was determined. It was found that the saturated acids, palmitic and stearic, were preferential substrates compared to the non-saturated linoleic, alpha-linolenic and eicosa-8,11,14-trienoic acids. All of them showed similar Vm values with different affinity constants. After 60-day treatment on a calcium-deficient diet (0.5 g Ca/kg diet), a significant increase in the acyl-CoA synthetase activity was observed for all the tested fatty acids in liver and kidney microsomes. These changes were e voked without any modification in the substrate selectivities shown for the control microsomes, and they were well-correlated with calcium level in both tissues. Under the calcium deficient state an increase in Vm values was observed for palmitic and eicosatrienoic acids with no changes in the corresponding Km, suggesting an increment in the number of active enzyme molecules within the microsomal membrane.
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Índice:
LILACS
Assunto principal:
Cálcio
/
Coenzima A Ligases
/
Rim
/
Fígado
/
Microssomos
Limite:
Animals
Idioma:
En
Revista:
Acta physiol. pharmacol. ther. latinoam
Assunto da revista:
FARMACOLOGIA
/
FISIOLOGIA
/
TERAPEUTICA
Ano de publicação:
1999
Tipo de documento:
Article