Hypoxia-induced regulation of placental REDD1 and mTOR was impaired in a rat model of estrogen-induced cholestasis.

Abstract:

PURPOSE:Hypoxia inducible factor-1α (HIF-1α), regulated in development and DNA damage response-1 (REDD1), and mammalian target of rapamycin (mTOR) play distinct roles in response to hypoxia. The aim of this study was to evaluate whether the HIF-1α-REDD1-mTOR-mediated hypoxic stress response also operates normally in estrogen-induced cholestasis. METHODS:Pregnant rats were administered with ethinylestradiol (EE) to induce cholestasis and then were subjected to feto-placental ischemia reperfusion (IR); as controls, one group received neither EE nor IR, and another two groups received only EE or IR. RESULTS:Giving rats either EE alone or IR alone increased placental levels of HIF-1α, REDD1, glucose transporter-1 (GLUT1), and phosphoglycerate kinase-1 (PGK1), and decreased placental mTOR and lactic dehydrogenase A (LDHA) expression compared with the control rats. Subjecting EE-treated rats to IR did not further alter placental levels of REDD1 or mTOR, while it did elevate placental HIF-1α, GLUT1, and PGK1 expression, and decline LDHA expression. By contrast, mRNA levels did not differ significantly among the four groups for any of the proteins analyzed. CONCLUSIONS:This study manifested that placental HIF-1α and its downstream glucose metabolism effectors can effectively react to hypoxia in EE-induced cholestasis rats. However, hypoxia-induced REDD1 and mTOR alternation, which responds efficiently in normal placentas, was impaired in EE-induced cholestasis placentas.

journal_name

Arch Gynecol Obstet

authors

Zhou F,Chen H,Wang X,Yu P,Hu Y

doi

10.1007/s00404-016-4186-7

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

1219-1226

issue

6

eissn

0932-0067

issn

1432-0711

pii

10.1007/s00404-016-4186-7

journal_volume

294

pub_type

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