title: C-type natriuretic peptide and atrial natriuretic peptide receptors of rat brain.
abstract: Natriuretic peptide receptors in rat brain were mapped by in vitro autoradiography using 125I-labeled [Tyr0]CNP-(1-22) to bind atrial natriuretic peptide receptor (ANPR)-B and ANPR-C receptors selectively, and 125I-labeled alpha-ANP to select ANPR-A and ANPR-C receptors. Des-[Gln18,Ser19,Gly20,Leu21,Gly22]ANP-(4- 23)-amide (C-ANP) was used for its selectivity for ANPR-C over ANPR-A. Specific binding of 125I-[Tyr0]CNP-(1-22) with a dissociation constant (Kd) approximately 1 nM occurred in olfactory bulb, cerebral cortex, lateral septal nucleus, choroid plexus, and arachnoid mater. This binding was abolished by C-type natriuretic peptide [CNP-(1-22)], alpha-ANP and C-ANP, and conformed to ANPR-C. 125I-alpha-ANP bound to all structures that bound 125I-[Tyr0]CNP-(1-22). This binding was also inhibited by both CNP-(1-22) and C-ANP, confirming the presence of ANPR-C-like binding sites. However, ANPR-C-like binding sites were heterogenous because only some had high affinities for 125I-[Tyr0]CNP-(1-22) and CNP-(1-22). 125I-alpha-ANP also bound sites without affinities for C-ANP or CNP-(1-22). These sites were consistent with ANPR-A. They occurred mainly on the olfactory bulb, the choroid plexus, and the subfornical organ. Guanosine 3',5'-cyclic monophosphate production was strongly stimulated by alpha-ANP but not by CNP-(1-22) in olfactory bulb. Neither ligand stimulated it in cortical tissue. Thus the natriuretic peptide binding sites of rat brain conformed to ANPR-A and to heterogenous ANPR-C-like sites. No ANPR-B were detected.
authors.affiliation: Physiological Laboratory, Cambridge, United Kingdom.
authors.forename: J
authors.initials: J
authors.lastname: Brown
authors.forename: Z
authors.initials: Z
authors.lastname: Zuo
mesh_terms: D000818:Animals; D001099:Arachnoid / Q000378:metabolism; D009320:Atrial Natriuretic Factor / Q000378:metabolism; D001345:Autoradiography; D001921:Brain / Q000378:metabolism*; D002540:Cerebral Cortex / Q000378:metabolism; D002831:Choroid Plexus / Q000378:metabolism; D006152:Cyclic GMP / Q000378:metabolism; D006162:Guanylate Cyclase / Q000378:metabolism*; D006179:Gyrus Cinguli / Q000378:metabolism; D007457:Iodine Radioisotopes; D008297:Male; D020098:Natriuretic Peptide, C-Type; D009419:Nerve Tissue Proteins / Q000378:metabolism; D009830:Olfactory Bulb / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D017461:Receptors, Atrial Natriuretic Factor / Q000378:metabolism*; D012686:Septal Nuclei / Q000378:metabolism; D014018:Tissue Distribution
chemical_list: D007457:Iodine Radioisotopes; D009419:Nerve Tissue Proteins; D020098:Natriuretic Peptide, C-Type; D009320:Atrial Natriuretic Factor; D006162:Guanylate Cyclase; D017461:Receptors, Atrial Natriuretic Factor; C073616:atrial natriuretic factor receptor C; D006152:Cyclic GMP