Preeclampsia Serum-induced Collagen I Expression and Intracellular Calcium Levels in Arterial Smooth Muscle Cells Are Mediated by the PLC-γ1 Pathway

Overview

Journal Exp Mol Med

Specialties Biochemistry
Molecular Biology

Date 2014 Sep 27

PMID 25257609

Citations 4

Authors

Rongzhen Jiang

Yincheng Teng

Yajuan Huang

Jinghong Gu

Li Ma

Ming Li

Yuedi Zhou

Affiliations

Soon will be listed here.

Abstract

In women with preeclampsia (PE), endothelial cell (EC) dysfunction can lead to altered secretion of paracrine factors that induce peripheral vasoconstriction and proteinuria. This study examined the hypothesis that PE sera may directly or indirectly, through human umbilical vein ECs (HUVECs), stimulate phospholipase C-γ1-1,4,5-trisphosphate (PLC-γ1-IP3) signaling, thereby increasing protein kinase C-α (PKC-α) activity, collagen I expression and intracellular Ca(2+) concentrations ([Ca(2+)]i) in human umbilical artery smooth muscle cells (HUASMCs). HUASMCs and HUVECs were cocultured with normal or PE sera before PLC-γ1 silencing. Increased PLC-γ1 and IP3 receptor (IP3R) phosphorylation was observed in cocultured HUASMCs stimulated with PE sera (P<0.05). In addition, PE serum significantly increased HUASMC viability and reduced their apoptosis (P<0.05); these effects were abrogated with PLC-γ1 silencing. Compared with normal sera, PE sera increased [Ca(2+)]i in cocultured HUASMCs (P<0.05), which was inhibited by PLC-γ1 and IP3R silencing. Finally, PE sera-induced PKC-α activity and collagen I expression was inhibited by PLC-γ1 small interfering RNA (siRNA) (P<0.05). These results suggest that vasoactive substances in the PE serum may induce deposition in the extracellular matrix through the activation of PLC-γ1, which may in turn result in thickening and hardening of the placental vascular wall, placental blood supply shortage, fetal hypoxia-ischemia and intrauterine growth retardation or intrauterine fetal death. PE sera increased [Ca(2+)]i and induced PKC-α activation and collagen I expression in cocultured HUASMCs via the PLC-γ1 pathway.

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