Hormonal regulation of MicroRNA expression in periovulatory mouse mural granulosa cells.

Biology of Reproduction
Stephanie D FiedlerLane K Christenson

Abstract

MicroRNAs (miRNAs) mediate posttranscriptional gene regulation by binding to the 3' untranslated region of messenger RNAs to either inhibit or enhance translation. The extent and hormonal regulation of miRNA expression by ovarian granulosa cells and their role in ovulation and luteinization is unknown. In the present study, miRNA array analysis was used to identify 212 mature miRNAs as expressed and 13 as differentially expressed in periovulatory granulosa cells collected before and after an ovulatory dose of hCG. Two miRNAs, Mirn132 and Mirn212 (also known as miR-132 and miR-212), were found to be highly upregulated following LH/hCG induction and were further analyzed. In vivo and in vitro temporal expression analysis by quantitative RT-PCR confirmed that LH/hCG and cAMP, respectively, increased transcription of the precursor transcript as well as the mature miRNAs. Locked nucleic acid oligonucleotides complementary to Mirn132 and Mirn212 were shown to block cAMP-mediated mature miRNA expression and function. Computational analyses indicated that 77 putative mRNA targets of Mirn132 and Mirn212 were expressed in ovarian granulosa cells. Furthermore, upon knockdown of Mirn132 and Mirn212, a known target of Mirn132, C-terminal bi...Continue Reading

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Methods Mentioned

BETA
chip
chips
transfection
Protein Assay

Software Mentioned

miRanda
GraphPad Prism
Affymetrix
PicTar
Primer Express
miRBase

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