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Levels of Hepatocyte Growth Factor and Its Messenger Ribonucleic Acid in Uncomplicated Pregnancies and Those Complicated by Preeclampsia¹

Department of Obstetrics and Gynecology (K.F., O.K., A.I., S.M., Y.T.), Faculty of Medicine, University of Nagoya, Showa-ku, Nagoya 466; Research Institute of Environmental Medicine (Y.K., Y.M., H.S.), University of Nagoya, Chikusa-ku, Nagoya 464; Division of Biochemistry (T.N.), Biomedical Research Center, Osaka University Medical School, Suita, Osaka 565, Japan

Address all correspondence and requests for reprints to: Osamu Kurauchi M.D., Department of Obstetrics and Gynecology, Faculty of Medicine, University of Nagoya, 65 Tsurumai-cho, Showa-ku, Nagoya 466, Japan.

The purpose of this study was to elucidate the possible relationship between hepatocyte growth factor (HGF) expression and the pathogenesis of preeclampsia. The concentration of immunoreactive HGF was measured and the expression of HGF messenger ribonucleic acid (mRNA) assessed in human placentas obtained from two groups: uncomplicated and preeclamptic pregnancies at various gestational weeks. In addition, the localization of HGF mRNA and c-met protein was analyzed using in situ hybridization and immunohistochemical staining, respectively. The expression of HGF mRNA and the concentration of immunoreactive HGF were highest in second trimester and were significantly decreased in preeclamptic placentas compared with the uncomplicated cases in third trimester. HGF mRNA was localized to placental mesenchymal cells, whereas c-met protein was demonstrated on cytotrophoblast. These results provide evidence of an abnormality of HGF expression in the preeclamptic placentas. Such placentas exhibit the abnormally shallow trophoblast invasion of the uterus, and reduced expression of HGF could well account for this morphometric change.