Binding of Antibodies Against High and Low Molecular Weight Cytokeratin Proteins in the Human Placenta with Special Reference to Infarcts, Proliferation and Differentiation Processes

Overview

Journal Histochem J

Specialty Biochemistry

Date 1997 May 1

PMID 9184857

Citations 8

Authors

H Neudeck

S L Oei

B Stiemer

H Hopp

R Graf

Affiliations

Soon will be listed here.

Abstract

Recent immunocytochemical studies have shown that placental villous trophoblasts contain the high molecular weight cytokeratin (CK) proteins 5/6 and 17. In the case of CK 17, trophoblastic immunostaining was positive in villi covered by fibrinoid. CKs 5/6 and 17 are expressed by hyperproliferative cells. The aim of this investigation was to examine the location of these CKs in placental infarcts, known to be demarcated by fibrinoid and hyperproliferative trophoblasts. The results were compared with those obtained by immunostaining against Ki-67, tenascin and alpha 1-, alpha 6- and beta 1-integrins, which are involved in cell proliferation, differentiation and regenerative processes. Furthermore, the expression of the single CKs 7, 8, 10, 13, 14, 18 and 19 was investigated by immunocytochemistry and immunoblotting. While low and high molecular weight CKs were present in villous and extravillous trophoblasts, only low molecular weight CKs were detected in vascular and extravascular placental smooth muscle cells. Placental infarcts revealed different immunoreactivities in the infarct margin and centre: high molecular CKs, tenascin, Ki-67 and oncofoetal fibronectin predominated in the infarct margin, low molecular CKs, fibrin and integrins in the centre. The expression of tenascin and a defined change in the expression of CK 17 indicates villous repair and hyperproliferative mechanisms in placental infarcts.

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