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- W1994345707 abstract "Estrone sulfate 16 alpha-hydroxylase activity is undetectable in liver microsomes from fetal guinea-pigs of the English Shorthair variety. Within 2 days of birth, considerable activity is present in both sexes of pigmented and albino animals. In the pigmented group, maximum activity occurs during the second week of life, with the mean values for each of the first 4 weeks, in both sexes, significantly higher than for the corresponding mature (greater than 12-week-old) animals. Immature levels in the albino group are also significantly higher than those of mature albinos. Pigmented females of all ages possess significantly higher activities than do their male counterparts. There are no such sex-related differences in albinos. Pigmented animals of all ages exhibit higher activities than do their albino counterparts. Castration of either sex, pigmented or albino, results in increased enzyme activities as compared with intact or sham-operated controls. Gestation leads to maternal enzyme values which are significantly above those of non-pregnant females, whether pigmented or albino. Beyond the first few days of life, total liver microsomal cytochrome P450 shows no significant change with age, gestation or pigmentation. These data support the conclusion that estrone sulfate 16 alpha-hydroxylase activity in the guinea-pig is markedly diminished, following sexual maturity, by presently unknown factors. This holds for both pigmented and albino animals but the decrease is greater in the latter. This decrease can be reversed by castration in either sex, or by pregnancy and could possibly relate to gonadal-pituitary relationships as demonstrated by others for rat liver hydroxylases." @default.
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- W1994345707 date "1983-08-01" @default.
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- W1994345707 title "Development and control of guinea-pig liver estrone sulfate 16α-hydroxylase" @default.
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- W1994345707 doi "https://doi.org/10.1016/0022-4731(83)90414-4" @default.
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