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• W2018365059 abstract "alpha-Adrenoceptors in spinal cord appear to play a role in a number of physiologic processes including the control of blood pressure, pain and motor function. In order to evaluate more clearly these potential roles, the characteristics of binding of [3H]prazosin ([3H]PRZ) to spinal alpha 1 adrenoceptors and [3H]p-aminoclonidine ([3H]PAC) to spinal alpha 2 adrenoceptors were determined. Binding of each ligand to their respective adrenoceptors was saturable and Scatchard analysis revealed binding of each to a single class of adrenoceptors with characteristics of [3H]PRZ binding of Bmax = 78 fmol/mg protein and Kd = 0.75 nM and [3H]PAC binding Bmax = 70 fmol/mg protein and Kd = 1.39 nM. Whereas [3H]PRZ specific binding (Bmax) was unaltered by guanine nucleotides. [3H]PAC binding was increased with addition of 10 microM guanosine triphosphate (GTP) (P less than 0.05) and decreased with either 50 microM GTP or guanyl-5'-yl-imidodiphosphate [Gpp(NH)p] (P less than 0.01). Competition for specific [3H]PRZ and [3H]PAC binding by various alpha 1 and alpha 2 adrenoceptor agonists and antagonists of known pharmacologic activity revealed that [3H]PRZ defines alpha 1 adrenoceptors (Ki = 2.1 nM for prazosin vs 4300 nM for yohimbine) and [3H]PAC defines alpha 2 adrenoceptors (Ki = 1.06 nM for yohimbine vs 15480 nM for prazosin). Regional spinal cord studies demonstrated that dorsal spinal cord in the lumbar region contains the highest density of both [3H]PRZ (Bmax = 93 +/- 14 fmol/mg protein) and [3H]PAC (Bmax = 101 +/- 6 fmol/mg protein) binding. In contrast, lowest binding was evident in thoracic cord with equal levels in both dorsal and ventral regions (Bmax = 44-48 fmol/mg protein). The regional distribution of both alpha 1 and alpha 2 adrenoceptors in spinal cord compares to the localization previously classified functionally utilizing various pharmacological agonists and antagonists at norepinephrine receptors." @default.
• W2018365059 created "2016-06-24" @default.
• W2018365059 creator A5062108557 @default.
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• W2018365059 date "1988-04-01" @default.
• W2018365059 modified "2023-09-26" @default.
• W2018365059 title "Binding of [3H]prazosin and [3H]p-aminoclonidine to α-adrenoceptors in rat spinal cord" @default.
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• W2018365059 doi "https://doi.org/10.1016/0006-8993(88)91196-1" @default.
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