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Abstract
Recent studies have suggested that both the angiotensin II type 1 (AT1) and type 2 (AT2) receptors may be involved in the control of renal function in rodents. The aim of this study was to examine the distribution of these receptors in normal and diseased human kidneys. Kidney samples were obtained from 21 patients with and without glomerular lesions (3 control kidney samples from patients undergoing nephrectomy, 4 patients with minimal change disease, 6 patients with IgA nephropathy, and 8 patients with membranous glomerulonephritis). AT1 receptor immunohistochemical staining was examined and found to be most prominent in blood vessels, but staining of the tubules and glomeruli was also seen. In the case of the AT2 receptor, mild-moderate immunohistochemical staining was seen in the blood vessels, with weaker staining in the glomeruli. A similar distribution was seen in the patients with glomerulopathy. These results suggest that both AT1 and AT2 receptors are expressed in the normal human kidney, as well as in patients with glomerular disease. The histological distribution of these receptors supports the notion that both receptors may have a physiological role in normal and diseased kidneys in humans.