Angiotensin-converting enzyme (ACE) inhibitors modulate cellular retinol-binding protein 1 and adiponectin expression in adipocytes via the ACE-dependent signaling cascade

Molecular Pharmacology
Karin KohlstedtIngrid Fleming

Abstract

Inhibitors of the angiotensin-converting enzyme (ACE) decrease angiotensin II production and activate an intracellular signaling cascade that affects gene expression in endothelial cells. Because ACE inhibitors have been reported to delay the onset of type 2 diabetes, we determined ACE signaling-modulated gene expression in endothelial cells and adipocytes. Using differential gene expression analysis, several genes were identified that were 3-fold up- or down-regulated by ramiprilat in cells expressing wild-type ACE versus cells expressing a signaling-dead ACE mutant. One up-regulated gene was the cellular retinol-binding protein 1 (CRBP1). In adipocytes, the overexpression of CRBP1 enhanced (4- to 5-fold) the activity of promoters containing response elements for retinol-dependent nuclear receptors [retinoic acid receptor (RAR) and retinoid X receptor (RXR)] or peroxisome proliferator-activated receptors (PPAR). CRBP1 overexpression also enhanced the promoter activity (by 470 +/- 40%) and expression/release of the anti-inflammatory and antiatherogenic adipokine adiponectin (cellular adiponectin by 196 +/- 24%, soluble adiponectin by 228 +/- 74%). Significantly increased adiponectin secretion was also observed after ACE inhibit...Continue Reading

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