叠氮化物抑制人类细胞色素P -4502E1, 1A2和3A4。

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Salmela KS, Tsyrlov IB, Lieber CS

叠氮化物抑制人类细胞色素P -4502E1, 1A2和3A4。

酒精临床试验决议2001年2月;25(2):253-60。

PubMed ID
11236840 (PubMed视图
摘要

背景:最近,我们发现除了细胞色素P-4502E1 (CYP2E1)外,CYP1A2和CYP3A4也有助于微粒体乙醇氧化系统(MEOS)。在测定MEOS活性时,叠氮化钠通常用于阻断污染过氧化氢酶。然而,尽管CYP2E1被认为对叠氮化物不敏感,但它对其他P-450s的影响尚不清楚。因此,本研究的目的是确定叠氮化物对人重组和肝脏CYP2E1、CYP1A2和CYP3A4的影响。方法与结果:叠氮化钠浓度低至0.1 mM时,显著抑制HepG2细胞中表达的重组CYP1A2和CYP3A4特异性乙醇氧化(平均+/- SEM)(分别为对照组的16 +/- 1%和22 +/- 2%;P < 0.01)。相比之下,在这种叠氮化物浓度下,CYP2E1的特异活性仅被轻微(且不显著)抑制(达到对照的79 +/- 12%)。类似地,在人肝微粒体(n = 6)中,0.1 mM叠氮化物强烈抑制cyp1a2依赖性(至25 +/- 2%)和cyp3a4依赖性(至15 +/- 2%)乙醇氧化,而CYP2E1仅在10 mM叠氮化物(至60 +/- 10%)下被抑制。叠氮化物也强烈影响这三种同工酶的表观动力学值。叠氮化物通过重组体和微粒体P-450s抑制了特定的单加氧酶活性。 CYP2E1-specific p-nitrophenol hydroxylation was the most sensitive to azide, whereas CYP1A2-dependent 7-methoxyresorufin O-dealkylation was only slightly inhibited. Judging from its effect on p-nitrophenol hydroxylation by human liver microsomes, the inhibition of azide was competitive (Ki 0.09 mM). CONCLUSIONS: Sodium azide at a concentration as low as 0.1 mM inhibited ethanol oxidation by CYP1A2 and CYP3A4. With CYP2E1, although oxidation of 50 mM ethanol was not inhibited by 0.1 mM azide, higher azide concentrations were inhibitory and 0.1 mM azide seemed to affect the kinetics of ethanol oxidation by CYP2E1. Therefore, azide should be avoided when measuring the MEOS activity because it may lead to underestimation, especially of CYP1A2- and CYP3A4-dependent ethanol oxidation.

引用本文的药物库数据

药物酶
药物 种类 生物 药理作用 行动
乙醇 细胞色素P450 1A2 蛋白质 人类
未知的
底物
细节
乙醇 细胞色素P450 3A4 蛋白质 人类
未知的
底物
抑制剂
诱导物
细节