The N-terminal domain of the mineralocorticoid receptor modulates both mineralocorticoid receptor- and glucocorticoid receptor-mediated transactivation from Na/K ATPase beta1 target gene promoter.

Abstract:

:Mineralocorticoid and glucocorticoid hormones activate the expression of the Na/K ATPase beta1 through direct binding of the mineralocorticoid receptor (MR) and glucocorticoid receptors (GR) to a mineralocorticoid- and glucocorticoid-responsive element in the beta1 promoter region, but activation of the beta1 promoter is inhibited by coexpression of both receptors. Here, using a series of mutated and chimeric receptors, we show that the N-terminal region of MR mediates an inhibitory effect on MR and GR activation from the beta1 promoter, in CV-1 cells. Deletion of the N-terminal region of MR (1-603) enhanced MR activation four-fold. Activation by chimeric MR, in which the N-terminus of GR replaces the N-terminal region of MR, was threefold that of wild-type MR. In addition, whereas coexpression of wild-type MR and GR was inhibitory, coexpression of chimeric MR and wild-type GR was nearly equal to that of MR. By contrast, mutated GR lacking its N-terminal region (1-420) was less efficient than the wild type in activating this promoter. These results demonstrate that the N-terminal domains of MR and GR have opposite transactivation properties and that MR region 1-603 is indeed inhibitory for both MR- and GR-mediated regulation of the Na/K ATPase beta1 gene promoter.

journal_name

Endocrine

journal_title

Endocrine

authors

Derfoul A,Robertson NM,Hall DJ,Litwack G

doi

10.1385/ENDO:13:3:287

subject

Has Abstract

pub_date

2000-12-01 00:00:00

pages

287-95

issue

3

eissn

1355-008X

issn

1559-0100

pii

ENDO:13:3:287

journal_volume

13

pub_type

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