Placental NFE2L2 is discordantly activated in monochorionic twins with selective intrauterine growth restriction and possibly regulated by hypoxia.

Abstract:

INTRODUCTION:Nuclear factor, erythroid 2 like 2 (NFE2L2) is an important transcription factor that protects cells from oxidative stress (OS). NFE2L2 deficiency in placentas is associated with pregnancy complications. We have demonstrated that elevated OS existed in placental shares of the smaller fetus in selective intrauterine growth restriction (sIUGR); however, the role of NFE2L2 in the development of sIUGR remains unknown. In this study, we examined the levels of NFE2L2 and heme oxygenase 1 (HMOX1), a major antioxidant regulated by NFE2L2, in sIUGR placentas. We also investigated the relationship between hypoxia and NFE2L2 activation, which may be involved in the pathogenesis of sIUGR. METHODS:Real-time PCR, Western blot, and immunohistochemistry were used to detect the levels of NFE2L2 and HMOX1 in placentas from 30 monochorionic diamniotic (MCDA) twin pregnancies. The trophoblast cell line HTR-8/SVneo was cultured under severe (3%) or mild (10%) hypoxia. RESULTS:NFE2L2 and HMOX1 were both up-regulated in placental shares of the smaller fetus in the sIUGR group. No significant inter-twin differences in NFE2L2 and HMOX1 were detected in the normal group. In vitro, NFE2L2 was suppressed under severe hypoxia (3% O2) but was clearly up-regulated under mild hypoxia (10% O2). DISCUSSION:Compared with the suppression of NFE2L2 in placentas of fetal growth restriction (FGR) in singleton pregnancies, NFE2L2 was up-regulated in placental shares of the smaller fetus in sIUGR pregnancies. The asymmetrical activation of NFE2L2 in placental shares of sIUGR twins may be a compensation for hypoxia that protects the smaller fetus from OS damage.

journal_name

Free Radic Res

journal_title

Free radical research

authors

Wu J,He Z,Gao Y,Zhang G,Huang X,Fang Q

doi

10.1080/10715762.2017.1315113

subject

Has Abstract

pub_date

2017-04-01 00:00:00

pages

351-359

issue

4

eissn

1071-5762

issn

1029-2470

journal_volume

51

pub_type

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