Title : The alternative Epac/cAMP pathway and the MAPK pathway mediate hCG induction of leptin in placental cells.

Pub. Date : 2012

PMID : 23056265






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1 We also found that hCG increased cAMP intracellular levels in BeWo cells in a dose-dependent manner, stimulated cAMP response element (CRE) activity and the cotransfection with an expression plasmid of a dominant negative mutant of CREB caused a significant inhibition of hCG stimulation of leptin promoter activity. Cyclic AMP hypertrichosis 2 (generalised, congenital) Homo sapiens
2 We also found that hCG increased cAMP intracellular levels in BeWo cells in a dose-dependent manner, stimulated cAMP response element (CRE) activity and the cotransfection with an expression plasmid of a dominant negative mutant of CREB caused a significant inhibition of hCG stimulation of leptin promoter activity. Cyclic AMP hypertrichosis 2 (generalised, congenital) Homo sapiens
3 These results demonstrate that hCG indeed activates cAMP/PKA pathway, and that this pathway is involved in leptin expression. Cyclic AMP hypertrichosis 2 (generalised, congenital) Homo sapiens
4 Nevertheless, we found leptin induction by hCG is dependent on cAMP levels. Cyclic AMP hypertrichosis 2 (generalised, congenital) Homo sapiens
5 We found that specific PKA inhibition by H89 caused a significant increase of hCG leptin induction, suggesting that probably high cAMP levels might inhibit hCG effect. Cyclic AMP hypertrichosis 2 (generalised, congenital) Homo sapiens
6 We found that specific PKA inhibition by H89 caused a significant increase of hCG leptin induction, suggesting that probably high cAMP levels might inhibit hCG effect. Cyclic AMP hypertrichosis 2 (generalised, congenital) Homo sapiens
7 We observed that a cAMP analogue that specifically activates Epac (CPT-OMe) stimulated leptin expression by hCG. Cyclic AMP hypertrichosis 2 (generalised, congenital) Homo sapiens
8 In conclusion, we provide evidence suggesting that hCG induction of leptin gene expression in placenta is mediated not only by activation of the MAPK signaling pathway but also by the alternative cAMP/Epac signaling pathway. Cyclic AMP hypertrichosis 2 (generalised, congenital) Homo sapiens