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• W1992214677 abstract "[(3)H]SSR-149415 is the first tritiated nonpeptide vasopressin V(1b) receptor (V(1b)R) antagonist ligand. It was used for studying rodent (mouse, rat, hamster) and human V(1b)R from native or recombinant origin. Moreover, a close comparison between the human and the mouse V(1b)R was performed using SSR-149415/[(3)H]SSR-149415 in binding and functional studies in vitro. [(3)H]SSR-149415 binding was time-dependent, reversible, and saturable. Scatchard plot analysis gave a single class of high-affinity binding sites with apparent equilibrium dissociation constant (K(d)) approximately 1 nM and maximum binding density (B(max)) values from 7,000 to 300,000 sites/cell according to the cell line. In competition experiments, [(3)H]SSR-149415 binding was stereospecific and dose-dependently displaced by reference peptide and nonpeptide arginine vasopressin (AVP)/OT ligands following a V(1b) rank order of affinity: SSR-149415 = AVP > dCha > dPen > dPal > dDavp > SSR-126768A > SR-49059 > SSR-149424 > OT > SR-121463B. Species differences between human, rat, mouse, and hamster V(1b)R were observed. Autoradiography studies with [(3)H]SSR-149415 on rat and human pituitary showed intense specific labeling confined to corticotroph cells and absence of labeling in the other tissues examined. SSR-149415 potently and stereospecifically antagonized the AVP-induced inositol phosphate production and intracellular Ca(2+) increase (EC(50) from 1.83 to 3.05 nM) in recombinant cell lines expressing either the mouse or the human V(1b)R. AVP (10(-7) M) exposure of AtT20 cells expressing mouse or human EGFP-tagged V(1b)R induced their rapid internalization. Preincubation with 10(-6) M SSR-149415 counteracted the internalization process. Moreover, recycling of internalized receptors was observed upon 10(-6) M SSR-149415 treatment. Thus SSR-149415/[(3)H]SSR-149415 are unique tools for studying animal and human V(1b)R." @default.
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• W1992214677 date "2007-08-01" @default.
• W1992214677 modified "2023-10-18" @default.
• W1992214677 title "Biological characterization of rodent and human vasopressin V_1breceptors using SSR-149415, a nonpeptide V_1breceptor ligand" @default.
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• W1992214677 doi "https://doi.org/10.1152/ajpregu.00062.2007" @default.
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