Angiotensin II-induced mitogen-activated protein kinase phosphatase-1 expression in bovine adrenal glomerulosa cells: implications in mineralocorticoid biosynthesis.

Abstract:

:Angiotensin II (AngII) stimulates aldosterone biosynthesis in the zona glomerulosa of the adrenal cortex. AngII also triggers the MAPK pathways (ERK1/2 and p38). Because ERK1/2 phosphorylation is a transient process, phosphatases could play a crucial role in the acute steroidogenic response. Here we show that the dual specificity (threonine/tyrosine) MAPK phosphatase-1 (MKP-1) is present in bovine adrenal glomerulosa cells in primary culture and that AngII markedly increases its expression in a time- and concentration-dependent manner (IC(50) = 1 nm), a maximum of 548 +/- 10% of controls being reached with 10 nm AngII after 3 h (n = 3, P < 0.01). This effect is completely abolished by losartan, a blocker of the AT(1) receptor subtype. Moreover, this AngII-induced MKP-1 expression is reduced to 250 +/- 35% of controls (n = 3, P < 0.01) in the presence of U0126, an inhibitor of ERK1/2 phosphorylation, suggesting an involvement of the ERK1/2 MAPK pathway in MKP-1 induction. Indeed, shortly after AngII-induced phosphorylation of ERK1/2 (220% of controls at 30 min), MKP-1 protein expression starts to increase. This increase is associated with a reduction in ERK1/2 phosphorylation, which returns to control values after 3 h of AngII challenge. Enhanced MKP-1 expression is essentially due to a stabilization of MKP-1 mRNA. AngII treatment leads to a 53-fold increase in phosphorylated MKP-1 levels and a doubling of MKP-1 phosphatase activity. Overexpression of MKP-1 results in decreased phosphorylation of ERK1/2 and aldosterone production in response to AngII stimulation. These results strongly suggest that MKP-1 is the specific phosphatase induced by AngII and involved in the negative feedback mechanism ensuring adequate ERK1/2-mediated aldosterone production in response to the hormone.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Casal AJ,Ryser S,Capponi AM,Wang-Buholzer CF

doi

10.1210/en.2007-0241

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

5573-81

issue

11

eissn

0013-7227

issn

1945-7170

pii

en.2007-0241

journal_volume

148

pub_type

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