[Cytofluorometric nuclear DNA analysis and immunohistochemical study on the proliferative activity of the trophoblasts in human early gestation].
Changes in proliferative activity in trophoblastic cells were evaluated in various different sites of implantation. DNA content analysis by cytofluorometry and immunohistochemical study using a monoclonal antibody Ki-67 was performed in 5 cases with a gestation period of 8-9 weeks. The measurement of proliferative activity of trophoblastic cells was analysed in four different sites of implantation: (1) the top of the anchoring villi, (2) the cell column, (3) the intermediate trophoblasts in the decidua basalis and myometrium, and (4) the free villi. A large number of Langhans cells on the top of the anchoring villi (L-cells) were mononuclear and tetraploid. It was demonstrated that the L-cell group had 2C, 4C and 8C peaks and also had a 4C mode. S-phase fraction was also found in the L-cell group. The so-called intermediate trophoblasts (IMT) in the cell column, decidua basalis and myometrium had 2C and 4C peaks and no S-phase fraction. Ki-67 positive cells existed only in the L-cell group. The findings are as follows: 1. The L-cell group had a higher proliferative activity than the other trophoblasts. It was found to have a mononuclear tetraploidy pattern. 2. It is suspected that the cells having 4C DNA content in the IMT originated in the L-cell group. 3. In conclusion, L-cells may differentiate to syncytial trophoblasts and IMT.
Wakuda
K
K
Department of Obstetrics and Gynecology, Shiga University of Medical Science.
Yoshida
Y
Y
D000328:Adult; D000911:Antibodies, Monoclonal; D000954:Antigens, Surface / Q000276:immunology; D002454:Cell Differentiation; D002455:Cell Division; D002467:Cell Nucleus / Q000378:metabolism; D002478:Cells, Cultured; D004247:DNA / Q000378:metabolism*; D010064:Embryo Implantation; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen; D011247:Pregnancy / Q000378:metabolism*; D011261:Pregnancy Trimester, First; D014327:Trophoblasts / Q000166:cytology* / Q000378:metabolism
D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D019394:Ki-67 Antigen; D004247:DNA