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Differentiation and proliferation patterns in human trophoblast revealed by c-erbB-2 oncogene product and EGF-R
J Muhlhauser, C Crescimanno, P Kaufmann, H Hofler, D Zaccheo and M Castellucci
Department of Anatomy, RWTH Aachen, Germany.
It is well known that growth factors and proto-oncogenes play a pivotal role in organogenesis as well as in tumor development. The human placenta is a rapidly growing organ which shares some aspects with malignant tumors. We have studied the expression of epidermal growth factor receptor (EGF-R) and the receptor encoded by the c-erbB-2 proto- oncogene in first- and third-trimester human placentas. We compared these expression patterns with that of the proliferation marker Ki-67. By immunohistochemistry, EGF-R was intensively expressed in the villous cytotrophoblast in the first trimester. The apical plasma membrane of the syncytium was weakly stained. In placental villi from the third trimester the reaction product for EGF-R was most intense in single villous cytotrophoblastic cells and along the apical plasma membrane of the syncytium, whereas the basal plasma membrane was much less stained. C-erbB-2 protein product was expressed in the first and third trimesters along the apical membrane of the syncytiotrophoblast. Concerning the extravillous trophoblast in cell islands and cell columns, EGF-R was expressed in the cells proximal to the villous stroma whereas the distal cells were c-erbB-2 positive. The Ki-67 antibody revealed the proliferative character of the villous cytotrophoblast and of the EGF-R-positive extravillous trophoblast. In contrast, most of the c-erbB-2-positive cells were Ki-67 negative. By in situ hybridization, c-erbB-2 transcripts were found in all types of villous and extravillous trophoblast, including those that did not express c-erbB-2 protein product. Our data indicate that EGF-R expression is strongly related to the proliferative trophoblast and, with advancing pregnancy, to the differentiated villous trophoblast.off contrast, expression of c-erB-2 protein product occurs only in more advanced stages of trophoblast differentiation, although transcripts of c-erbB-2 are found in both proliferative and differentiated trophoblast. In addition, the coexpression of EGF-R and c-erbB-2 protein product in the syncytiotrophoblast suggests their involvement in complex regulation of hormones and growth factors.
Volume 41,
Issue 2,
pp. 165-173,
02/01/1993
Copyright © 1993 by The Histochemical Society
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