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Probing drug mechanism of action via cellular metabolomics and fluxomics: An unexpected effect of the dihydrofolate reductase inhibitor trimethoprim

机译:细胞代谢组学探测作用的药物机制:二氢酚还原酶抑制剂的意外效果Trimethoprim

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LC-MS/MS enables for the first time measurement of the full spectrum of cellular folates. Isotope-labeling techniques can probe the dynamics of folate metabolism. Analysis of metabolic fluxes can reveal previously unrecognized mechanisms of drug action. DHFR inhibitor trimethoprim has a "domino effect": (1) Trimethoprim inhibits DHFR; (2) DHFR-blockade increases H_(2)PteGlu_(n) pools; (3) H_(2)PteGlu_(n) inhibits FPGS activity; (4) FPGS-blockade decreases polyglutamated folate pools; (5) Reactions that depend on polyglutamated folates as cofactors cannot occur; (6) Cell growth slows. The observed domino effect in E. coli is sufficient to explain the complex dynamics of folate pools following trimethoprim addition, as revealed by a quantitative, chemical kinetic model of the system.
机译:LC-MS / MS为第一次测量细胞叶片的全谱位。同位素标记技术可以探讨叶酸新陈代谢的动态。代谢助熔剂的分析可以揭示先前未被识别的药物作用机制。 DHFR抑制剂Trimethokim具有“多米诺效应”:(1)TrimethoLim抑制DHFR; (2)DHFR-elcloplade增加H_(2)PTEGLU_(N)池; (3)H_(2)PTEGLU_(N)抑制FPGS活动; (4)FPGS-opletade降低聚谷物叶酸池; (5)依赖于辅因子的聚乙烯叶酸的反应不能发生; (6)细胞生长缓慢。在大肠杆菌中观察到的Domino效应足以解释Trimethoprim添加后叶酸池的复杂动态,如系统的定量化学动力学模型所揭示的。

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