Abstract
1. The adenosine receptors from pig kidney proximal tubules have been studied in membrane vesicle preparations derived from either luminal (brush-border membranes-BBM-) or basolateral (BL) sides. There was a substantial amount of A2-like NECA binding in both preparations, but the A1 subtype of adenosine receptors was not found in either BBM or BL membranes. The use of [3H]-CGS21680 which is a more specific ligand for A2a receptors revealed true adenosine receptors in the BBM. 2. The kinetic parameters for [3H]-CGS21680 binding to pig renal BBM were: Bmax = 1.48 pmol mg-1 protein and Kd = 150 nM. In the presence of Gpp(NH)p the affinity decreased (Kd = 220 nM), whereas the addition of Mg2+ induced a marked increase in affinity (Kd = 83 nM). These equilibrium constants are higher than those found for the A2a adenosine receptors present in pig brain striatal membranes (Kd = 12 nM), and are close to those found in rat renal BBM (Kd = 90 nM). 3. The order of potency of agonist and antagonists was not consistent with the presence of either A1 or A2 receptors, but it was very similar to the agonist order of potency for the A3 receptor subtype. Furthermore, the blockade of the [3H]-CGS21680 binding by both cholera and pertussis toxin further supports the view that the subtypes present in BBM are neither A1 nor A2. 4. Overall the results suggest the presence in BBM of an A3 receptor, or of a new subtype of adenosine receptor, which is linked to G proteins sensitive to both cholera and pertussis toxins.
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