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Angiotensin II modulates ion transport in rat proximal tubules through CYP metabolites.

Abstract：

:To assess the effect of angiotensin II on ion transport in rat isolated proximal tubules and establish the arachidonic acid cytochrome P450 metabolites' role mediating angiotensin II effect and to analyze whether corticosteroids play a role modulating this effect, we studied the effect of low (10 and 100 pM) and high (0.1-1 microM) angiotensin II concentrations on proximal tubule ion transport, measured as (86)Rb uptake. Low angiotensin II produced a stimulation on the (86)Rb uptake (195.79 +/- 35, 377.9 +/- 81, and 300 +/- 49 pg (86)Rb/microg protein/2 min, for control and 10 and 100 pM angiotensin II, respectively). High angiotensin II concentration inhibited ion transport (0.1 microM, 57.9 +/- 5 and 1 microM, 47.3 +/- 4 pg (86)Rb/microg protein/2 min), this effect was prevented by 17-ODYA and by losartan, while indomethacin had no effect. Dexamethasone treatment increased angiotensin II-induced (86)Rb uptake inhibition and arachidonic acid metabolism (19-, 20-HETE and 12-HETE), while adrenalectomy partly prevented angiotensin II-induced inhibition and decreased cytochrome P450-dependent arachidonic acid metabolism. In conclusion, high doses of angiotensin II produce inhibition of ion transport in rat isolated proximal tubules; this effect is mediated by AT(1) receptors, involves cytochrome P450-dependent arachidonic acid metabolites, and is upregulated by corticosteroids.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Sánchez-Mendoza A,López-Sánchez P,Vázquez-Cruz B,Rios A,Martínez-Ayala S,Escalante B

doi

10.1006/bbrc.2000.2807

subject

Has Abstract

pub_date

2000-06-07 00:00:00

pages

423-30

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006291X00928079

journal_volume

272

pub_type

杂志文章

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