Objective: To compare the differential expression of 15-lipoxygenase (15-LO) isoenzymes, 15-LO-1 and 15-LO-2 in preeclampsia (PE), and normal pregnancy and its metabolite 15-hydroxyeicosatetraenoic acid (15-HETE) on the vasoconstriction of human umbilical artery (HUA) rings.
Study Design: We performed western blotting and isometric tension studies and t-test analysis on data from 6 women with normal pregnancy and 8 women with PE.
Results: Expressions of 15-LO-1 and 15-LO-2 in placentas and HUA rings in PE increased more than that in normal groups (P<0.01). 15-HETE increased HUA rings tension in a dose-dependence manner, which were significantly greater in PE than in normal pregnant controls (P<0.01). However, the constriction of HUA rings was completely eliminated by 2-aminoethoxydiphenyl borate (2-APB) in both normal pregnancy and PE (P<0.01) and attenuated partly by nifedipine in dose-dependence in normal pregnancy (10(-8)mol/L P>0.05; 10(-7), 10(-6)mol/L P<0.05) and in PE (P<0.01).
Conclusion: PE upregulates 15-LO pathway via 15-HETE, which increased intercellular calcium level to cause constriction of HUA rings.
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