Phospholipase D1 as a key enzyme for decidualization in human endometrial stromal cells

Mee-Sup Yoon, Mee‐Sup Yoon, Jun Bon Koo, Yong Geon Jeong, Yong Seok Kim, Jung Han Lee, Hyae Jin Yun, Ki Sung Lee, Joong‐Soo Han, Joong-Soo Han
Biology of reproduction · 2006 · vol. 76(2) , pp. 250–258 · doi:10.1095/biolreprod.106.056226 · PMID:17065600 · W2161734538
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Phospholipase D1 upregulation is essential for human endometrial stromal cell decidualization induced by 8-Br-cAMP, mediated through PLA2G1B and phosphatidic acid production.

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Abstract

Using primary cell cultures of human endometrial stromal cells (ES cells), we investigated the role of phospholipase D (PLD) in 8-Br-cAMP-induced decidualization, which involves morphological and biological differentiation processes. When treated with 0.5 mM 8-Br-cAMP for 12 days, ES cells were transformed into a decidualized morphology and produced significant amounts of prolactin (PRL) and insulin-like growth factor-binding protein 1 (IGFBP1). Simultaneously, the activity and expression levels of PLD1 increased. In addition, removal of 8-Br-cAMP from decidualized ES cells restored the undifferentiated state, and this was accompanied by decreases in PLD1 promoter activity and PLD1 expression. Overexpression of dominant negative (DN)-PLD1 inhibited the morphological changes induced by 0.5 mM 8-Br-cAMP, whereas PLD1 overexpression induced morphological changes in the absence of 0.5 mM 8-Br-cAMP treatment. Moreover, knockdown of PLD1 by siRNA and blockage of PLD by treatment with 0.3% 1-butanol decreased PRL/IGFBP1 mRNA expression, whereas PLD1 overexpression increased PRL/IGFBP1 mRNA expression. Treatment of ES cells with phosphatidic acid (PA) for 3 days induced PRL mRNA expression and morphological changes, which implies that PA is an end-product of PLD activation-induced decidualization. In addition, pretreatment of ES cells with mepacrine decreased PRL/IGFBP1 expression and inhibited morphological change, whereas pretreatment with propranolol caused no changes, as compared to cAMP-treated cells, which suggests that PA induces decidualization through phospholipase A2 (PLA2G1B). Taken together, these results suggest that PLD1 regulates 8-Br-cAMP-induced decidualization through PLA2G1B, and that PLD1 upregulation is essential for the decidualization of ES cells.

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MeSH descriptors

8-Bromo Cyclic Adenosine Monophosphate Decidua Decidua Endometrium Phospholipase D Stromal Cells 1-Butanol 1-Butanol 8-Bromo Cyclic Adenosine Monophosphate Cells, Cultured Decidua Endometrium Endometrium Endometrium Enzyme Inhibitors Enzyme Inhibitors Female Genes, Dominant Group IB Phospholipases A2 Group IB Phospholipases A2

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