Binding of the imidazoline UK-14, 304, a putative full alpha 2-adrenoceptor agonist, to rat cerebral cortex membranes.

Binding of the imidazoline UK-14, 304, a putative full alpha 2-adrenoceptor agonist, to rat cerebral cortex membranes.
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咪唑啉 UK-14, 304(一种假定的全 α2-肾上腺素受体激动剂)与大鼠大脑皮层膜的结合。

DOI:
10.1016/0024-3205(84)90152-8
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发表时间:
1984
期刊:
影响因子:
6.1
通讯作者:
U'Prichard,DC
U'Prichard,DC
中科院分区:
医学2区
文献类型:
--
作者:
Loftus,DJ;Stolk,JM;U'Prichard,DC

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与其他咪唑啉不同,芳基咪唑啉化合物 UK-14, 304(5-溴-6-[2-咪唑啉-2-基-氨基]-喹喔啉)是一种有效的选择性 α2-肾上腺素受体激动剂,具有完全的内在活性。我们研究了高比活性(84 Ci/mmol)[3H] UK-14, 304 与大鼠大脑皮层膜结合的特征。 [3H] UK-14, 304 特异性结合可被 Mn2+ 离子增强,并在 25°C 下适度快速地结合和解离。去甲肾上腺素可置换结合是可饱和的和单相的,KD 为 1.4 nM,与速率和竞争实验一致,Bmax 为 200 fmol/mg 蛋白质。竞争研究表明,结合是α2-肾上腺素受体特异性的,育亨宾的效力是哌唑嗪的 12 倍。 [3H] UK-14, 304 似乎主要标记大脑 α2-肾上腺素受体的 R(H) 状态,根据儿茶酚胺和咪唑啉激动剂 (IC50, 1–13 nM) 的高亲和力以及育亨宾和萝芙素 (IC50, 100–300 nM) 在结合位点的相对较低亲和力来判断。 [3H] UK-14,304 因其高亲和力和比活性而优于其他 α2-肾上腺素受体配体。
The aryl imidazoline compound UK-14, 304 (5-bromo-6-[2-imidazolin-2-yl-amino]-quinoxaline) is a potent and selective α2-adrenoceptor agonist with full intrinsic activity, unlike other imidazolines. We examined the characteristics of high specific activity (84 Ci/mmol) [3H] UK-14, 304 binding to rat cerebral cortex membranes. [3H] UK-14, 304 specific binding was enhanced by Mn2+ion, and associated and dissociated moderately rapidly at 25°C. Norepinephrine-displaceable binding was saturable and monophasic, with a KDof 1.4 nM, in agreement with rate and competition experiments, and a Bmaxof 200 fmol/mg protein. Competition studies revealed that binding was α2-adrenoceptor-specific, with yohimbine being 12 times more potent than prazosin. [3H] UK-14, 304 appeared to label predominantly the R(H) state of the brain α2-adrenoceptor, as judged by the high affinity of catecholamine and imidazoline agonists (IC50, 1–13 nM), and the relatively low affinity of yohimbine and rauwolscine (IC50, 100–300 nM), at the binding site. [3H] UK-14,304 compares favorably with other α2-adrenoceptor ligands because of its high affinity and specific activity.
DOI: --
发表时间: 1980
影响因子: 4.8
作者:
B. Hoffman;D. Mullikin;R. Lefkowitz
通讯作者: R. Lefkowitz
大鼠脑中多个 α2-去甲肾上腺素能受体位点:鸟嘌呤核苷酸和二价阳离子对高亲和力 [3H] 可乐定结合的选择性调节
DOI: 10.1111/j.1471-4159.1980.tb06607.x
发表时间: 1980
影响因子: 4.7
作者:
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通讯作者: S. Snyder
可乐定和可乐定类似物与神经母细胞瘤×胶质瘤杂交细胞和大鼠脑的α-肾上腺素能受体的相互作用
DOI: 10.1111/j.1432-1033.1981.tb05094.x
发表时间: 1981
期刊: FEBS Journal
影响因子: 5.4
作者:
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α1-和 α2-肾上腺素能受体的表征
DOI: --
发表时间: 1983
期刊:
影响因子: --
作者:
D. Bylund;D. U'prichard
通讯作者: D. U'prichard
[3H]rauwolscine(α-育亨宾):脑 α2-肾上腺素能受体的特异性拮抗剂放射性配体
DOI: 10.1016/0014-2999(81)90123-0
发表时间: 1981
影响因子: 5
作者:
B. Perry;D. U'prichard
通讯作者: D. U'prichard