The Pattern of Distribution of Selected ATP-Sensitive P2 Receptor Subtypes in Normal Rat Kidney: An Immunohistological StudyTurner C.M. · Vonend O. · Chan C. · Burnstock G. · Unwin R.J.
aCentre for Nephrology and Department of Physiology, bBiochemistry and Molecular Biology, cAutonomic Neuroscience Institute, Royal Free and University College Medical School, London, UK
Using immunohistological techniques and available polyclonal antibodies, we have identified several ATP-sensitive P2 receptor subtypes in specific structures of the normal rat kidney. Of the P2 receptor subtypes examined, P2X1, P2X2 and P2Y1 receptors were found in the smooth muscle layer of intrarenal vessels. The P2Y1 receptor was also found on glomerular mesangial cells, the brush border membrane of the proximal straight tubule and on peritubular fibroblasts. In the cortex, P2Y4 receptors were found on the tubule epithelium of the proximal convoluted tubule, and P2Y2 receptors on glomerular epithelial cells (podocytes). P2X4 and P2X6 receptors were present throughout the renal tubule epithelium from the proximal tubule to the collecting duct. P2X5 receptors were expressed on medullary collecting duct cells and the apical membrane of the S3 segment of the proximal tubule. Possible functions of these receptor subtypes in normal rat kidney are discussed.
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