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Effects of ACTH administration on zonation of the guinea pig adrenal cortex.

Abstract：

:Experiments were done to determine the actions of ACTH on the morphologic and functional characteristics of the zona fasciculata (ZF) and zona reticularis (ZR) in the guinea pig adrenal cortex. In control guinea pigs, a number of morphologic differences distinguished the ZF from the ZR, including the presence of far more lipid in the ZF than in the ZR. Treatment with ACTH decreased the lipid droplet content of the ZF cells, equalizing the amount of lipid in the two zones. Other morphologic differences between the ZF and ZR were also diminished by ACTH treatment. Immunohistochemical analyses indicated that CYP17 protein was found in both the ZF and ZR in control animals, but with greater immunostaining intensity in the ZF. The enzyme protein distribution corresponded with higher 17alpha-hydroxylase activity in the ZF than in the ZR. After ACTH treatment, the intensity of staining and enzyme activities in the two zones were similar, attributable largely to increases in the ZR. In situ hybridization-and immunohistochemistry showed that in control animals CYPD216 was highly expressed in the ZR but not in the ZF. ACTH treatment dramatically reduced the intensity of CYP2D16 mRNA and protein staining in the ZR. Bufuralol 1'-hydroxylase activity, a marker for CYP2D subfamily members, was also decreased significantly in the ZR by ACTH treatment. The data indicate that administration of ACTH to guinea pigs has opposite effects on the expression of CYP17 and CYP2D16 in the ZR, and diminishes or eliminates some of the structural and functional differences between the ZF and ZR. The results suggest a role for ACTH in establishing and maintaining adrenocortical zonation.

journal_name

Mol Cell Endocrinol

journal_title

Molecular and cellular endocrinology

authors

Yuan BB,Tchao R,Funae Y,Voigt JM,Colby HD

doi

10.1016/s0303-7207(98)00189-0

keywords:

subject

Has Abstract

pub_date

1998-11-25 00:00:00

pages

129-36

issue

1-2

eissn

0303-7207

issn

1872-8057

journal_volume

146

pub_type

杂志文章

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