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Aldosterone promotes fibronectin production through a Smad2-dependent TGF-beta1 pathway in mesangial cells.

Abstract：

:Accumulating evidence demonstrates that aldosterone can cause extra-cellular matrix (ECM) accumulation, in addition to regulating sodium and potassium homeostasis. Increased extra-cellular matrix production by renal glomerular mesangial cells has been suggested to be involved in pathogenesis of glomerular sclerosis. The present studies examine whether aldosterone is also produced in renal mesangial cells, and the effect of aldosterone on ECM accumulation in these cells. In cultured renal mesangial cells, aldosterone synthase (CYP11B2), mineralocorticoid receptor (MR), and 11beta-HSD2 mRNA expressions were detected by RT-PCR. The ability of renal mesangial cells to produce aldosterone was confirmed by directly detecting aldosterone in culture medium via radioimmunoassay. Real-time RT-PCR showed that the expression of CYP11B2 mRNA in mesangial cells was significantly enhanced by AngII (P<0.001) and by potassium (P<0.05). Exposure of the cultured mesangial cells to aldosterone significantly increased fibronectin production from 12.4+/-1.9 to 74.6+/-16.8ng/ml (P<0.05). The aldosterone induced fibronectin production was abolished by aldosterone receptor antagonist spironolactone. Aldosterone also increased the TGF-beta1 reporter luciferase activity from 0.8+/-0.1 to 1.7+/-0.1 (P<0.05). Immunoblot showed TGF-beta1 protein expression was increased following aldosterone treatment. Blocking TGF-beta1 signaling pathway by knocking down Smad2 significantly blunted the aldosterone induced fibronectin production. The present studies indicate that renal mesangial cell is a target of local aldosterone action, which promotes ECM protein fibronectin production via TGF-beta1/Smad2 signaling pathway.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Lai L,Chen J,Hao CM,Lin S,Gu Y

doi

10.1016/j.bbrc.2006.07.057

subject

Has Abstract

pub_date

2006-09-15 00:00:00

pages

70-5

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(06)01525-7

journal_volume

348

pub_type

杂志文章

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