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- W2012048218 abstract "To understand changes associated with the menstrual cycle in the human ovary, it is very important to examine chronological changes in P450 aromatase (P450arom) enzymatic activity in the normal cycling ovary. Therefore, we initially examined the correlation between intensity of P450arom immunoreactivity and its biochemical enzymatic activity in five estrogen-producing human cancer cell lines (HHUA, Ishikawa, HEC-59, OMC-2, and MCF-7). P450arom immunointensity per cell was evaluated by the CAS 200 computed image analysis system, and its catalytic activity per 10(6) culture cells was analyzed by the tritiated water method. A significant correlation (r = 0.959) was demonstrated between P450arom immunoreactivity and enzymatic activity under optimal conditions of tissue fixation and immunohistochemical procedures. We then investigated P450arom immunointensity in 31 specimens of normal cycling human ovaries to examine chronological changes in P450arom activity per cell throughout the menstrual cycle. In the follicular phase, P450arom was observed in the granulosa cells of one selected antral follicle per case during the mid- to late proliferative period, and its immunointensity per granulosa cell in the follicle was not significantly different between mid- and late proliferative periods, although serum estradiol level was markedly elevated in the late proliferative period. In the luteal phase, both P450arom immunointensity per luteinized granulosa cell in a corpus luteum and serum estradiol level reached a peak in the mid-secretory period. These findings indicate that different factors may influence ovarian P450arom activity during the follicular and luteal phases, i.e., an increased number of granulosa cells in the selected follicle during the follicular phase but changes in P450arom activity per luteinized granulosa cell in the corpus luteum during the luteal phase." @default.
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- W2012048218 date "1994-12-01" @default.
- W2012048218 modified "2023-09-25" @default.
- W2012048218 title "Quantitation of P450 aromatase immunoreactivity in human ovary during the menstrual cycle: relationship between the enzyme activity and immunointensity." @default.
- W2012048218 doi "https://doi.org/10.1177/42.12.7983357" @default.
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