Effects of 6-(.OMEGA.-substituted alkyl)-2,3-dimethoxy-5-methyl-1,4-benzoquinones and related compounds on mitochondrial succinate and reduced nicotinamide adenine dinucleotide oxidase systems.
作者:KAYOKO OKAMOTO、MUTSUKO MATSUMOTO、MASAZUMI WATANABE、MITSURU KAWADA、TETSUJI IMAMOTO、ISUKE IMADA
DOI:10.1248/cpb.33.3745
日期:——
2, 3-Dimethoxy-5-methyl-1, 4-benzoquinones having an ω-hydroxyalkyl or ω-aminoalkyl group at the 6-position were synthesized. The effects of these compounds and related compounds on the respiratory system of ubiquinone-depleted mitochondrial preparations were investigated. The compounds with an alkyl side chain of 10 to 13 carbon atoms showed rather high restoration activity on antimycin-sensitive succinate oxidation in acetone-treated beef heart mitochondria. This activity was correlated with their partition coefficients. Among these compounds, 6-(10-hydroxydecyl)-2, 3-dimethoxy-5-methyl-1, 4-benzoquinone (V-10, idebenone) was selected for further testing to determine its effect on the respiratory system of injured canine brain mitochondrial preparation, because this compound showed prominent activity in the system described above. When V-10 was added to acetone-treated canine brain mitochondria (A-CBM), antimycin- and KCN-sensitive succinate oxidation were restored to the level observed in the freeze-stored canine brain mitochondria (CBM). V-10 also restored the reduced nicotinamide adenine dinucleotide (NADH) oxidation of pentane-treated canine brain mitochondria and submitochondrial particles (P-CBM and P-CBSM). Metabolites (I-4, I-10) of V-10 in human and animals showed no restoration activity in either respiratory enzyme system.
合成了在6位具有ω-羟烷基或ω-氨烷基的2, 3-二甲氧基-5-甲基-1, 4-苯醌。这些化合物及相关化合物对缺乏泛醌的线粒体制备的呼吸系统的影响进行了研究。具有10到13个碳原子的烷基侧链的化合物在醋酮处理的牛心线粒体中对抗霉素敏感的琥珀酸氧化表现出相当高的恢复活性。该活性与它们的分配系数相关。在这些化合物中,6-(10-羟基癸基)-2, 3-二甲氧基-5-甲基-1, 4-苯醌(V-10,艾苯酮)被选中进行进一步测试,以确定其对受损犬脑线粒体制备的呼吸系统的影响,因为该化合物在上述系统中表现出显著活性。当V-10被添加到醋酮处理的犬脑线粒体(A-CBM)时,抗霉素和氰化物敏感的琥珀酸氧化恢复到冷冻保存的犬脑线粒体(CBM)所观察到的水平。V-10还恢复了五烷处理的犬脑线粒体和亚线粒体颗粒(P-CBM和P-CBSM)的还原型烟酰胺腺嘌呤二核苷酸(NADH)氧化。在人类和动物中,V-10的代谢物(I-4,I-10)在任一呼吸酶系统中均未显示出恢复活性。