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Molecular Pharmacology

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Abstract

Pharmacological evidence for the heterogeneity of atrial natriuretic factor-R1 receptor subtype.

J Féthière and A De Léan
Molecular Pharmacology December 1991, 40 (6) 915-922;
J Féthière
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A De Léan
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Abstract

The atrial natriuretic factor-R1 (ANF-R1) receptor is known to mediate the biological effects of diverse natriuretic/diuretic/vasorelaxant peptides. In order to investigate the differential selectivity of this class of receptor, we have compared its pharmacological profile for various natriuretic peptides in rat, bovine, and human kidney. In contrast to bovine and rat, human kidney glomeruli do not express significant amounts of ANF-R2 receptor. In addition, the binding of 125I-labeled rat ANF-(99-126) to the ANF-R1 receptor in human and bovine kidney glomeruli is not blocked by rat ANF-(103-123) (pK less than 6), whereas in rat kidney glomeruli this peptide displays high affinity for the ANF-R1 receptor (pK = 8.5). This observation reveals a species heterogeneity between the rat and the human and bovine kidney receptors. In addition, we have observed striking differences in the pharmacological profiles of rat papillary, bovine papillary, and human kidney glomerular receptors, which contain only the 130-kDa ANF-R1 monomer. The bovine and human profiles were similar but diverged from that of the rat. In addition to the species heterogeneity of the ANF-R1 class, we could detect a significant intraspecies heterogeneity. Two distinct profiles could be disclosed, one having high affinity for both ANF and brain natriuretic peptide (BNP) and being identified in all three species studied and the other displaying lower affinity for BNP and being found in rat and human kidneys. We also demonstrate that rat and bovine papillary ANF-R1 receptors are coupled to guanylate cyclase and that ANF and BNP could activate the enzyme with potency similar to their potency in competing for 125I-labeled rat ANF-(99-126) binding. The results presented demonstrate that the ANF-R1 receptor class can be subclassified, based on distinct pharmacological profiles, and indicate a wide diversity within the ANF-R1 receptor family.

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Molecular Pharmacology
Vol. 40, Issue 6
1 Dec 1991
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Abstract

Pharmacological evidence for the heterogeneity of atrial natriuretic factor-R1 receptor subtype.

J Féthière and A De Léan
Molecular Pharmacology December 1, 1991, 40 (6) 915-922;

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Abstract

Pharmacological evidence for the heterogeneity of atrial natriuretic factor-R1 receptor subtype.

J Féthière and A De Léan
Molecular Pharmacology December 1, 1991, 40 (6) 915-922;
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