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Journal of Clinical Endocrinology & Metabolism, Vol 80, 2815-2821, Copyright © 1995 by Endocrine Society
ARTICLES |
K Takayama, H Sasano, T Fukaya, K Morohashi, T Suzuki, M Tamura, MJ Costa and A Yajima
Department of Obstetrics and Gynecology, Tohoku University School of Medicine, Sendai.
Ad4-binding protein (Ad4BP) has been demonstrated recently as a transcription factor that serves as a general regulator of all steroidogenic P450 genes. We examined the expression of Ad4BP in 32 normal cycling human ovaries and 22 human ovarian sex cord stromal tumors by immunoblotting and immunohistochemistry. Immunoblotting of normal cycling human ovaries revealed a single band of 53 kilodaltons, corresponding to the mol wt of Ad4BP. We also correlated Ad4BP expression with the immunolocalization of the steroidogenic enzymes (side-chain cleavage cytochrome P450, cytochrome P450 17 alpha- hydroxylase, and cytochrome P450 aromatase). Ad4BP immunoreactivity, which was present only in the nuclei, was observed sporadically in the granulosa cells and adjacent stromal cells in the preantral follicles. In the dominant antral follicles, Ad4BP was detected in both granulosa and theca interna cells. However, in the nondominant antral follicles, Ad4BP was observed only in theca interna cells. In the corpus luteum, Ad4BP was present in both luteinized granulosa and thecal cells. Ad4BP was also expressed in some atretic follicles and degenerating corpora lutea. The spatial and temporal localization of Ad4BP in the normal cycling human ovary generally correlated well with that of steroidogenic enzymes. However, expression of the steroidogenic enzymes followed that of Ad4BP during the developing stages of the preantral follicle and vice versa during the process of follicular atresia. In ovarian sex cord stromal tumors, Ad4BP expression was observed in tumor cells that were positive for steroidogenic enzymes, but not in nonsteroidogenic tumor cells. These results, especially the in situ colocalization of Ad4BP and the steroidogenic enzymes, suggest that Ad4BP has the potential to control steroidogenic P450 expression in both normal and pathological human ovaries.
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