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Hormonal regulation of malic enzyme and glucose-6-phosphate-dehydrogenaes expression in fetal brown-adipocyte primary cultures under non-proliferative conditions

AuthorsValverde, Ángela M.; Benito, Manuel; Lorenzo, Margarita
Issue Date1992
PublisherJohn Wiley & Sons
CitationEuropean Journal of Biochemistry 203(1-2): 313-319 (1992)
AbstractThe expression of malic enzyme and glucose-6-phosphate (Glc6P) dehydrogenase was investigated in primary cultures of fetal brown adipocytes after the prolonged presence (6 d or 10 d) of various hormones under non-proliferative conditions. The presence of triiodothyronine for 6 d and 10 d resulted in maturation of the triiodothyronine regulatory mechanism of malic-enzyme expression at the mRNA level. However, triiodothyronine had no effect on Glc6P dehydrogenase expression. Insulin increased malic-enzyme and Glc6P dehydrogenase expression at the mRNA and protein level after 6 d and 10 d of culture. The joint presence of triiodothyronine and insulin produced an additive effect on malic-enzyme expression at the mRNA and protein level after 6 d and 10 d of culture, by two independent mechanisms. Noradrenaline prevented the effect at the protein level after 6 d, but not after 10 d, probably due to loss of the β-adrenergic response of brown adipocytes after prolonged culture. Triiodothyronine overexpressed the Glc6P dehydrogenase mRNA induced by the presence of insulin at 6 d and 10 d of culture. There was no adrenergic regulation of Glc6P dehydrogenase expression in cultured fetal brown adipocytes, regardless of the time of culture.
Identifiersdoi: 10.1111/j.1432-1033.1992.tb19861.x
issn: 0014-2956
e-issn: 1432-1033
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