Turkish Journal of Pathology

Türk Patoloji Dergisi

Turkish Journal of Pathology

Turkish Journal of Pathology

2010, Vol 26, Num, 1     (Pages: 031-037)

Expression of Ki-67, Bcl-2 and Bax in the First Trimester Abortion Materials

Canan KELTEN 1, Osman ZEKİOĞLU 2, Coşan TEREK 3, Necmettin ÖZDEMİR 2, Ender DÜZCAN 1

1 Department of Pathology, Pamukkale University, Faculty of Medicine, DENIZLI, TURKEY
2 Ege University, Faculty of Medicine, IZMIR TURKEY
3 Department of Gynecology and Obstetrics, Ege University, Faculty of Medicine, IZMIR, TURKEY

DOI: 10.5146/tjpath.2010.00992
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Objective: The aim of this study was to investigate possible similar or different mechanisms in recurrent and spontaneous abortion by evaluating immunohistochemical correlation between proliferation marker Ki-67, and apoptosis markers Bcl-2 and Bax in the fetal trophoblasts and maternal deciduas from abortion material.

Material and Method: Eighty samples of curettage materials from 65 abortion patients histopathologically diagnosed “decidua showing Arias-Stella reaction and chorionic villi” or only “decidua showing Arias-Stella reaction” were included in the study. Hematoxylin&Eosin stained sections from all cases were re-evaluated and further stained immunohistochemically using antibodies against Ki-67, Bcl-2 and Bax.

Results: Proliferation rate evaluated by Ki-67 expression both in the cytotrophoblastic cells and decidua was found to be significantly lower in spontaneous and recurrent abortions compared to evacuation abortion. The extent of Bcl-2 expression in syncytiotrophoblastic cells covering villous stroma was also decreased in spontaneous abortion. There were no significant differences between spontaneous and recurrent abortions in terms of Bcl-2 expression in syncytiotrophoblasts and Ki-67 proliferation index in cytotrophoblastic cells or decidua. Bax staining showed minimal decidual expression in a few spontaneous and recurrent abortions.

Conclusion: We concluded that proliferation rate was decreased in fetal villous cytotrophoblasts and maternal deciduas in spontaneous and recurrent abortions. We also proposed that loss of Bcl-2 expression in syncytiotrophoblasts may cause abortion in a subset of cases. However, the data from spontaneous and recurrent abortions did not not support the presence of different mechanisms in both groups.

Keywords : Abortion, Cell proliferation, Apoptosis, Ki-67, Bcl-2, Bax