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Genetic regulation of testosterone 15 alpha-hydroxylase (cytochrome P-450(15)alpha) in renal microsomes of female mice.

Abstract：

:P-450(15)alpha is a form of cytochrome P-450 purified from liver microsomes of female 129/J mice that is specific for oxidation of testosterone to its 15 alpha-hydroxylated product. Testosterone 15 alpha-hydroxylase activity that was inhibited by anti-P-450(15)alpha antibody was approximately 50 times higher in renal microsomes from 129/J than in BALB/cJ females. Western blots of renal microsomes using anti-P-450(15)alpha antibody showed the presence of immunoreactive protein with a molecular weight identical with that of hepatic P-450(15)alpha in 129/J but not in BALB/cJ female mice. To investigate the genetic basis for the strain differences in this activity, the distribution of P-450(15)alpha-dependent testosterone 15 alpha-hydroxylase activity in renal microsomes from individual females of 129/J and BALB/cJ, of F1 offspring of these strains, and of F1 back-crosses to the progenitor strains were determined. The results were consistent with a sex-related autosomal dominant regulation of the higher activity in 129/J females by a single locus, designated Rsh (regulation of steroid hydroxylase). The amounts of immunochemically cross-reactive P-450(15)alpha protein were linearly correlated with testosterone 15 alpha-hydroxylase activities in renal microsomes from Rsh heterozygotes and homozygotes. At least twice as much mRNA, which hybridized with the cDNA clone for hepatic P-450(15)alpha, was detected in 129/J and 129CF1/J compared to BALB/cJ female kidneys. The evidence suggests a pretranslational regulation of the P-450(15)alpha isozyme in the female mouse kidney by the Rsh locus.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Biochemistry

journal_title

Biochemistry

authors

Squires EJ,Negishi M

doi

10.1021/bi00365a028

subject

Has Abstract

pub_date

1986-08-26 00:00:00

pages

4913-8

issue

17

eissn

0006-2960

issn

1520-4995

journal_volume

25

pub_type

杂志文章

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