1,5-Bis(4-amidinophenoxy)pentane (pentamidine) is a potent inhibitor of [3H]idazoxan binding to imidazoline I2 binding sites.

1,5-Bis(4-amidinophenoxy)pentane (pentamidine) is a potent inhibitor of [3H]idazoxan binding to imidazoline I2 binding sites.
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1,5-Bis(4-amidinophenoxy)pentane (pentamidine) 是 [3H]idazoxan 与咪唑啉 I2 结合位点结合的有效抑制剂。

DOI:
10.1016/s0014-2999(98)00386-0
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发表时间:
1998
影响因子:
5
通讯作者:
R. Tidwell
R. Tidwell
中科院分区:
医学2区
文献类型:
--
作者:
DOROTHY H. Wood;J. Hall;Beate G. Rose;R. Tidwell

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芳香族二脒1,5-双(4-脒基苯氧基)戊烷(喷他脒)用于治疗和预防获得性免疫缺陷综合征患者的卡氏肺囊虫肺炎。喷他脒的临床使用受到严重毒性的限制,包括低血压和低血糖。尽管临床毒性已得到很好的描述,但其机制仍知之甚少。使用[3H]咪唑克生作为放射性配体和西拉唑啉来定义非特异性结合的竞争性结合分析表明,喷他脒以1.4±0.22 nM的Kiof与大鼠肝膜上的咪唑啉I2结合位点结合。 Ki 表明喷他脒抑制放射性配体在咪唑啉 I2 位点上的结合,其亲和力接近已知最有效的配体,并且可能与喷他脒的毒性有关。此外,喷他脒类似物抑制放射性配体的结合,其亲和力范围根据其结构而变化。两种候选药物化合物 5 和 6 在皮质类固醇抑制的卡氏疟原虫肺炎大鼠模型中比喷他脒更具活性,但对咪唑啉 I2 位点具有不同的亲和力(Ki5=50.1±1.06 nM 和 Ki6=∼3500 nM)。该位点的亲和力与抗菌活性(r=0.60;p=0.09)或辛醇:水分配系数的计算对数(ClogP)(r=-0.38;p=0.22)无关。
The aromatic diamidine 1,5-bis(4-amidinophenoxy)pentane (pentamidine) is used for treatment and prophylaxis of Pneumocystis carinii pneumonia in patients with Acquired Immune Deficiency Syndrome. Clinical use of pentamidine has been restricted by significant toxicity, that includes hypotension, and hypoglycemia. Although clinical toxicity is well described, the mechanisms are still poorly understood. Competitive binding analyses using [3H ]idazoxan as the radioligand, and cirazoline to define non-specific binding, demonstrate that pentamidine binds to an imidazoline I2binding site on rat liver membranes with a Kiof 1.4±0.22 nM. The Kiindicates that pentamidine inhibits radioligand binding at imidazoline I2sites with an affinity approximating the most potent known ligands and may be related to pentamidine toxicity. Moreover, pentamidine analogs inhibit radioligand binding with a range of affinities that vary according to their structure. Two candidate drugs, Compounds 5 and 6, are more active than pentamidine in the corticosteroid-suppressed rat model of P. carinii pneumonia, yet have different affinities for the imidazoline I2site (Ki5=50.1±1.06 nM and Ki6=∼3500 nM). Affinity for this site does not correlate with antimicrobial activity (r=0.60; p=0.09) or the calculated log of the octanol:water partition coefficient (ClogP) (r=−0.38; p=0.22).
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