Abstract
Differential promoter use and alternative splicing generate a variety of glucocorticoid receptor (GR) mRNA transcripts, potentially altering the cortisol responsiveness of gestational tissues during pregnancy and labor. We examined GR mRNA transcript expression in term placentae before and after labor, in association with fetal sex and after glucocorticoid treatment. RNA from 34 placentae and from eight placental explants incubated with glucocorticoids were analyzed for the GR mRNA variants GR-alpha, GR-beta, GR-P, and GR-gamma and the untranslated exon one variants 1A1, 1A2, 1A3, 1B, and 1C by quantitative RT-PCR. mRNA expression was assessed. All GR mRNA variants examined were detected in the human placenta, with GR-alpha and GR-1C mRNA having the highest expression of GR splice variants and exon 1 variants, respectively. GR-P mRNA abundance decreased with spontaneous labor (P < 0.01). GR-1A3 mRNA abundance changed with fetal sex, with a higher level in placentae of male fetuses (P < 0.05). GR-1C was the preferential promoter for GR-alpha, GR-gamma, and GR-P mRNA. GR-beta mRNA was preferentially associated with GR-1A1. GR-P mRNA transcription switched to the GR-1A1 promoter after labor and to the GR-1A3 promoter in placentae ...Continue Reading
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