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Binding of antibodies against high and low molecular weight cytokeratin proteins in the human placenta with special reference to infarcts, proliferation and differentiation processes

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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 α1-, α6- and β1- 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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Authors and Affiliations

  1. Institut fur Anatomie, UniversitLtsklinikum Benjamin Franklin, Freie Universitat Berlin, Konigin-Luise-Str. 15, D-, 14195, Berlin, Germany

    Hermann Neudeck & Renat E Graf

  2. Institut fur Biochemie, Fachbereich Chemie, Freie Universitat Berlin, Thielallee 63, D- 14195, Berlin, Germany

    Shiao Li Oei

  3. Frauenklinik und Poliklinik, UniversitLtsklinikum Benjamin Franklin, Freie Universitat Berlin, Hindenburgdamm 30, D-12200, Berlin, Germany

    Beate Stiemer & Hartmut Hopp

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  1. Hermann Neudeck
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  2. Shiao Li Oei
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  3. Beate Stiemer
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  4. Hartmut Hopp
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  5. Renat E Graf
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Neudeck, H., Oei, S.L., Stiemer, B. et al. Binding of antibodies against high and low molecular weight cytokeratin proteins in the human placenta with special reference to infarcts, proliferation and differentiation processes. J Mol Hist 29, 419–430 (1997). https://doi.org/10.1023/A:1026499203743

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