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首页> 外文期刊>Life sciences >Ligand binding profiles of delta-opioid receptor in human cerebral cortex membranes: evidence of delta-opioid receptor heterogeneity.
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Ligand binding profiles of delta-opioid receptor in human cerebral cortex membranes: evidence of delta-opioid receptor heterogeneity.

机译:人大脑皮层膜中δ-阿片受体的配体结合概况:δ-阿片受体异质性的证据。

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In this study, receptor binding profiles of opioid ligands for subtypes of opioid delta-receptors were examined employing [3H]D-Pen2,D-Pen5-enkephalin ([3H]DPDPE) and [3H]Ile(5,6)-deltorphin II ([3H]Ile-Delt II) in human cerebral cortex membranes. [3H]DPDPE, a representative ligand for delta1 sites, labeled a single population of binding sites with apparent affinity constant (Kd) of 2.72 +/- 0.21 nM and maximal binding capacity (Bmax) value of 20.78 +/- 3.13 fmol/mg protein. Homologous competition curve of [3H]Ile-Delt II, a representative ligand for delta2 sites, was best fit by the one-site model (Kd = 0.82 +/- 0.07 nM). Bmax value (43.65 +/- 2.41 fmol/mg) for [3H]Ile-Delt II was significantly greater than that for [3H]DPDPE. DPDPE, [D-Ala2,D-Leu5]enkephalin (DADLE) and 7-benzylidenaltrexone (BNTX) were more potent in competing for the binding sites of [3H]DPDPE than for those of [3H]Ile-Delt II. On the other hand, deltorphin II (Delt II), [D-Ser2,Leu5,Thr6]enkephalin (DSLET), naltriben (NTB) and naltrindole (NTI) were found to be equipotent in competing for [3H]DPDPE and [3H]Ile-Delt II binding sites. These results indicate that both subtypes of opioid delta-receptors, delta1 and delta2, exist in human cerebral cortex with different ligand binding profiles.
机译:在这项研究中,使用[3H] D-Pen2,D-Pen5-脑啡肽([3H] DPDPE)和[3H] Ile(5,6)-deltorphin检查了阿片样物质δ受体亚型的阿片样物质配体的受体结合特征II([3H] Ile-Delt II)在人的大脑皮层膜中。 [3H] DPDPE,一个delta1位点的代表配体,标记了一个单一的结合位点群体,其表观亲和常数(Kd)为2.72 +/- 0.21 nM,最大结合容量(Bmax)值为20.78 +/- 3.13 fmol / mg蛋白。单点模型(Kd = 0.82 +/- 0.07 nM)最佳拟合了[3H] Ile-Delt II(delta2位点的代表性配体)的同源竞争曲线。 [3H] Ile-Delt II的Bmax值(43.65 +/- 2.41 fmol / mg)明显大于[3H] DPDPE。与[3H] Ile-Delt II的结合位点相比,DPDPE,[D-Ala2,D-Leu5]脑啡肽(DADLE)和7-苄基二苯甲酮(BNTX)更有效地竞争[3H] DPDPE的结合位点。另一方面,发现deltorphin II(Delt II),[D-Ser2,Leu5,Thr6]脑啡肽(DSLET),纳曲本(NTB)和纳曲酮(NTI)在竞争[3H] DPDPE和[3H]方面具有同等效力。 ] Ile-Delt II结合位点。这些结果表明,阿片类药物δ受体的两个亚型delta1和delta2存在于人大脑皮质中,具有不同的配体结合特征。

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