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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1988 May;85(9):2949–2953. doi: 10.1073/pnas.85.9.2949

Expression of the differentiation-induced gene for fatty acid-binding protein is activated by glucocorticoid and cAMP.

J S Cook 1, J J Lucas 1, E Sibley 1, M A Bolanowski 1, R J Christy 1, T J Kelly 1, M D Lane 1
PMCID: PMC280120  PMID: 2452440

Abstract

We have isolated and characterized a fragment of the gene encoding adipose fatty acid-binding protein (gene 422) from a 3T3-L1 adipocyte genomic library. The 5'-flanking sequence of the 422 gene contains potential regulatory regions for adipose-specific expression. At position -120 there is a fat-specific element that occurs in several genes expressed as preadipocytes differentiate, and at position -393 there is a glucocorticoid regulatory element core sequence. Chimeric constructs were prepared by ligating 858 base pairs or 248 base pairs of 5'-flanking sequence and 22 nucleotides of 5'-untranslated sequence of the 422 gene to the bacterial gene encoding chloramphenicol acetyltransferase (CAT); these constructs (delta 858.CAT and delta 248.CAT) were transfected into 3T3-L1 preadipocytes. When differentiation was initiated by the adipogenic agents methylisobutylxanthine (a cAMP phosphodiesterase inhibitor), dexamethasone, and insulin, expression of both constructs increased, reaching maximal levels within 24 hr. Both constructs were maximally induced 48 hr before appreciable accumulation of the endogenous 422 mRNA. Expression of delta 858.CAT, but not of delta 248.CAT, was induced by dexamethasone, which correlates with deletion of the potential glucocorticoid regulatory element. Expression of both constructs was induced by 8-bromoadenosine 3',5'-cyclic monophosphate, thus implicating the first 248 base pairs of 5'-flanking sequence of the 422 gene in the response to cAMP. Indirect effects by the adipogenic factors on CAT protein or mRNA synthesis and turnover were ruled out, since replacing the 5'-flanking region of the 422 gene constructs with viral promoters abolished the effects of dexamethasone and 8-bromoadenosine 3',5'-cyclic monophosphate on CAT expression. We conclude that the first 858 base pairs of 5'-flanking sequence of the 422 gene contains elements that mediate activation by dexamethasone and cAMP.

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Selected References

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