Abstract：
:An excess of lipids may accumulate in the kidney in conditions such as diabetes and hypertension, and can potentially cause renal injury. We previously reported that an infusion of angiotensin II into a rat induced deposition of lipids in the renal tubular epithelial cells. Here we have examined the effect of pioglitazone, an agonist of the peroxisome proliferator-activated receptor-γ (PPAR-γ), on renal lipid accumulation and renal injury induced by angiotensin II infusion. Pioglitazone treatment (2.5mg/kg/day) reduced the amount of triglycerides in the kidney of the angiotensin II-induced hypertensive rat without significantly altering either blood pressure levels or mRNA expression of lipogenic genes in the kidney. In addition, pioglitazone, either alone or in conjunction with angiotensin II, increased the expression of phosphorylated, but not total, AMP-activated protein kinase (AMPK). Proteinuria and kidney weight in the angiotensin II-infused rat were significantly decreased by pioglitazone treatment. In addition, pioglitazone suppressed iron deposition and ferritin protein induction, but did not alter upregulated expression of the antioxidative molecule, heme oxygenase-1, in the kidney of the angiotensin II-infused rat. These findings suggested that pioglitazone suppressed the angiotensin II-induced increase in renal lipid content by inhibiting its proteinuric action, but not by direct alteration of the expression or activity of lipid metabolism-related genes. Reduction of lipotoxic renal damage may represent one of the renoprotective effects provided by pioglitazone in hypertension with activation of the renin-angiotensin system.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Sakamoto A,Hongo M,Saito K,Nagai R,Ishizaka Ndoi
10.1016/j.ejphar.2012.02.027subject
Has Abstractpub_date
2012-05-05 00:00:00pages
131-6issue
1-3eissn
0014-2999issn
1879-0712pii
S0014-2999(12)00163-Xjournal_volume
682pub_type
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