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The Korean Journal of Pathology 2000;34(11): 927-933.
Telomerase Activity and Expression of MIB-1 and bcl-2 in Human Chorionic Villi from Early and Term Normal Pregnancy.
Jung Sook Cho, Young Soon Kang, In Gul Moon, Bum Chae Choi, Jong Pyo Lee, Hoon Taek Lee, Sung Ran Hong
1Department of Pathology, Samsung Cheil Hospital, Sungkyunkwan University School of Medicine, Seoul 100-380, Korea.
2Department of Endocrinology Lab., Samsung Cheil Hospital, Sungkyunkwan University School of Medicine, Seoul 100-380, Korea.
3Department of OB & GY, Samsung Cheil Hospital, Sungkyunkwan University School of Medicine, Seoul 100-380, Korea.
4Department of OB & GY, Ilsan Cheil Hospital.
5Department of Biotechnology, KunKuk University Agriculture and Animal Science.
ABSTRACT
Telomerase is an enzyme that maintains telomeres and prevents telomere shortening, and may be linked with cellular proliferation or the aging process. The purpose was to examine telomerase activity in human chorionic villi from early and term normal pregnancies, and to analyze the correlation of telomerase activity (TA) with MIB-1 & bcl-2. A total of 37 placentae were obtained from 16 early and 21 term pregnancies. TA was assayed by telomeric repeat amplification protocol, and immunohistochemical staining was performed for MIB-1 & bcl-2 expression. TA & MIB-1 expression were strong in early placenta, but bcl-2 was highly expressed in term placentae. Thirteen (81.25%) of 16 early placentae showed TA, but only 2 (9.52%) of 21 term placentae expressed TA (p<0.01). MIB-1 was observed in nuclei of cytotrophoblast, and the expression rate was 16.09% in early placentae and 2.87% in term placentae (p<0.01). bcl-2 was observed only in the cytoplasm of syncytiotrophoblast. Term placenta demonstrated stronger expression of bcl-2 compared to early placentae (p<0.05). These findings suggest that TA, MIB-1 & bcl-2 expression are critically regulated over the course of gestation: cytotrophoblast, main cells of early chorionic villi, may be a common source of telomerase and proliferative activity. The TA showed good correlation with cellular proliferative activity. Syncytiotrophoblast, may be a main source of bcl-2 expression which is stronger in the term placentae.
Key Words: Telomerase activity; MIB-1; bcl-2; Placenta