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Human Reproduction, Vol. 9, No. 4, pp. 591-596, 1994
© 1994 European Society of Human Reproduction and Embryology

other

Morpho-functional study of human luteal cell subpopulations

I. Retamales1, I. Carrasco2, J.L. Troncoso2, J. Las Heras1, L. Devoto2 and M. Vega2,3,4

1Department of Pathology, San Borja-Arriarán Hospital, National Health Service Santiago 7, Chile 2Research Institute for the Mother and Child Santiago 7, Chile 3Department of Cell Biology and Genetics, Faculty of Medicine, University of Chile, P.O. Box 70061 Santiago 7, Chile

Correspondence: 4To whom correspondence should be addressed

It has been reported that the mammalian corpus luteum is composed mainly of two subpopulations of luteal cells (large and small) of different morphology and function. The aims of this study were first to characterize cytologically the human corpus luteum throughout the luteal phase, and second to establish the in-vitro steroidogenic capacity of a well-defined human mid-luteal cell system. The results show that the most predominant (>70%) cell shape, is polyhedric, and the number of cells per unit area is significantly different in the early, mid- and late corpus luteum (P< 0.005). Moreover, small cells (<22 µm) were most common (56.8%) in all tissues analysed. On the other hand, both subpopulations synthesized progesterone, oestradiol and testosterone, although a significantly greater production of basal steroids was observed in large luteal cells (P< 0.05). Nevertheless, the response of small cells to human chorionic gonadotrophin (HCG) was significantly greater (P< 0.05) than that of large cells, in agreement with the preferential specific binding obtained for (125I)HCG to the small cell subpopulation. In summary, these results indicate that the human corpus luteum possesses distinct cell types, which may be related to endocrine function and its control.

Key words: cell size/human chorionic gonadotrophin/human luteal cell subpopulations/steroidogenesis


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