Hyperinsulinemia Increases Placenta Endothelin-Converting Enzyme-1 Expression in Trophoblasts

BACKGROUND Exogenous hyperisulinemia causes pregnancy, induced hypertension and intrauterine growth restriction (IUGR) in pregnant rats. Hyperinsulinemia may increase production of endothelin-1 (ET-1), produced by sequential proteolysis of the big endothelin by the endothelin-converting enzyme (ECE)-1, the expression of which is examined here in the placenta, kidney, heart, and liver. METHODS Rats were rendered hyperinsulinemic by subcutaneous insulin pellet, mated and followed to the twenty-first day of pregnancy. They were then killed, and their fetuses and placentas were examined. RESULTS Hyperinsulinemic dams (HD) had higher blood pressure (BP) (130 +/- 17 mm Hg in HD vs. 115 +/- 16 mm Hg in normal pregnant dams (NPD), P < 0.05), lower placenta weight (0.44 +/- 0.08 g in HD vs. 0.47 +/- 0.08 NPD, P < 0.05) and lower fetus weight: males 4.9 +/- 0.4 g in HD vs. 5.5 +/- 0.4g in NPD, P < 0.0001; females 4.7 +/- 0.49 in HD vs. 5.2 +/- 0.4g in NPD (P < 0.0001). ECE-1 expression as determined by western blot was significantly increased in the placenta and its implantation site, i.e., the mesometrial triangle (MT) of HD by 46 and 48%, respectively. In the kidney and heart of HD ECE-1, protein expression was increased by 230 and 220%, respectively, but its level in the liver was similar in both groups. Immunohistochemical staining revealed ECE-1 expression in endothelial cells and trophoblastic cells of the placenta and MT. Endothelin receptor A (ET-A), a mediator of vasoconstriction by ET-1, was also expressed in the endothelium and in trophoblasts of the placenta and MT. The expression of both ECE-1 and ET-A, as measured by automated image analysis, was generally stronger in placentas of HD. CONCLUSIONS ECE-1 and ET-A are expressed in the trophoblastic cells of the placenta and MT. This may affect local endothelin levels, BP and IUGR.