DEMONSTRATION OF PLATELET-ACTIVATING-FACTOR RECEPTOR IN GUINEA-PIG KIDNEY

Distribution of platelet activating factor (PAF) receptor was examined in the guinea pig kidney. Northern blot analysis showed a single band electrophoresed just below the 28S rRNA, and the mRNA was richest in the cortex with lesser amounts in the outer and then inner medulla. Scatchard analysis of membrane fraction using [3H]WEB 2086, a specific PAF receptor antagonist, revealed a single binding site with Bmax of 522, 228, 58 fmol/mg protein for the cortex, outer medulla and inner medulla, respectively. Kd values were in the same order of magnitude (10-8 M). These results indicate the presence of a single class of PAF receptor in the guinea pig kidney which is most abundant in the cortex. © 1991.