Forkhead transcription factor FOXO1A is critical for induction of human decidualization

The Journal of Endocrinology
L GriniusStuart Handwerger

Abstract

Experiments utilizing RNA interference technology were performed to determine whether the forkhead transcription factor FOXO1A, a member of the FOXO family of proteins, plays a critical role in the induction of human uterine decidualization. Human decidual fibroblast cells were decidualized in vitro for 6 days with medroxyprogester-one, estradiol, and dibutyryl cAMP in the presence or absence of a highly specific FOXO1A small interfering RNA (siRNA) that inhibits FOXO1A mRNA and protein expression by more than 80%. RNA and proteins were extracted from the cells at 0, 2, 4, and 6 days. FOXO1A and IGFBP-1 proteins were determined by immunoblotting; and intracellular mRNA levels for several decidualization marker genes were determined by real-time PCR. Exposure of the cells to FOXO1A siRNA in five separate experiments resulted in a 40-75% inhibition of prolactin, IGFBP-1, tissue inhibitor of metalloproteinase 3 (TIMP3), somatostatin and endometrial bleeding-associated factor (EBAF) mRNAs, all of which are markedly induced during the decidualization process. In contrast, actin and GAPDH mRNA levels did not change during decidualization. The inhibition of mRNA levels was first noted at day 2 and persisted for the remainder of each e...Continue Reading

Citations

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