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Reduced L-arginine level and decreased placental eNOS activity in preeclampsia

Title
Reduced L-arginine level and decreased placental eNOS activity in preeclampsia
Authors
Kim Y.J.Park H.S.Lee H.Y.Ha E.H.Suh S.H.Oh S.K.Yoo H.-S.
Ewha Authors
하은희김영주서석효오세관박혜숙이화영
SCOPUS Author ID
하은희scopus; 김영주scopus; 서석효scopus; 오세관scopus; 박혜숙scopus; 이화영scopus
Issue Date
2006
Journal Title
Placenta
ISSN
0143-4004JCR Link
Citation
vol. 27, no. 4-5, pp. 438 - 444
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Nitric oxide is produced enzymatically by the nitric oxide synthase (NOS), which converts L-arginine in the presence of oxygen to L-citrulline and NO. Moreover, it has been reported that asymmetric dimethylarginine (ADMA) acts as is an endogenous inhibitor of endothelial NOS (eNOS) by competing with the enzyme for L-arginine. In this study, we measured L-arginine and ADMA in normal and preeclamptic women, and also investigated the association between the Glu298Asp eNOS gene polymorphism and preeclampsia. Finally, we assessed eNOS expression levels in the placentas of both normal and preeclamptic patients, using Western blot and immunohistochemistry. L-arginine levels were found to be significantly lower in the preeclamptic women than in the normal pregnant women (p = 0.02) but there were no significant differences in ADMA levels between the normal and preeclamptic women. We also determined there to be no association between the Glu298Asp eNOS gene and preeclampsia. With regard to placental eNOS expression, we detected a lower degree of eNOS expression in the preeclamptic syncytiotrophoblasts than in the normal syncytiotrophoblasts. We suggest that reduced L-arginine levels, rather than increased ADMA levels, contribute to the development of preeclampsia, and also that decreased placental eNOS expression constitutes a characteristic finding in preeclamptic placentas. © 2005 Elsevier Ltd. All rights reserved.
DOI
10.1016/j.placenta.2005.04.011
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의학전문대학원 > 의학과 > Journal papers
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