Reduced placental prolyl hydroxylase 3 mRNA expression in pregnancies affected by fetal growth restriction

Abstract

Objective To investigate the role of the hypoxia-inducible factor (HIF) pathway in fetal growth restriction (FGR). Design A case-control study. Setting Research laboratory and gynaecology clinic. Sample Twenty placentas from normal pregnancies and 20 from FGR pregnancies. Methods RNA extraction, cDNA synthesis, quantitative real-time polymerase chain reaction (qRT-PCR) assay, statistical analysis. Main outcome measures mRNA expression of HIF-1α, HIF-2α and HIF-β (ARNT), along with prolyl hydroxylase domain 3 (PHD3), which leads to proteasomal degradation of HIF-α subunits. Results No statistically significant differences in the transcription levels of ARNT and HIF-2α were found between FGR and normal placentas. By contrast, PHD3 and HIF-1α mRNA were downregulated in FGR placentas. PHD3 mRNA expression was associated with gestational age at delivery (P=0.008), birthweight centile (P=0.029) and abnormal umbilical artery (UA) Doppler measurements (P=0.034). Conclusions As PHD3 regulates the HIF-mediated hypoxic response in FGR, we deduce that fetal adaptation to hypoxia ranges from impaired to adequate, as observed by the gradient of PHD3 downregulation in relation to the severity of FGR. © RCOG 2010 BJOG An International Journal of Obstetrics and Gynaecology.