Semisynthetic Antimycobacterial C-3 Silicate and C-3/C-21 Ester Derivatives of Fusidic Acid: Pharmacological Evaluation and Stability Studies in Liver Microsomes, Rat Plasma, and <i>Mycobacterium tuberculosis</i> culture
作者:Mathew Njoroge、Gurminder Kaur、Marlene Espinoza-Moraga、Antonina Wasuna、Godwin Akpeko Dziwornu、Ronnett Seldon、Dale Taylor、John Okombo、Digby F. Warner、Kelly Chibale
DOI:10.1021/acsinfecdis.9b00208
日期:2019.9.13
and aryl esters functioned as classic prodrugs of FA, being hydrolyzed to FA in microsomes, plasma, and Mycobacterium tuberculosis culture. In contrast, C-3 silicate esters and C-21 esters were inert to hydrolysis and so did not act as prodrugs. The antimycobacterial activity of the C-3 silicate esters was comparable to that of FA, and these compounds were stable in microsomes and plasma, identifying
夫西地酸(FA)是一种天然产物,以富丁烷三萜烯为基础的抗生素,具有独特的结构特征,在体外具有抗结核分枝杆菌(TB)的活性。尽管FA在人体中具有良好的药代动力学,但它在啮齿动物中迅速代谢,因此使该模型中的概念验证研究变得复杂。为了将FA重新定位为抗结核病药物,我们在此描述了大鼠肝微粒体,大鼠血浆和分枝杆菌细胞培养物中FA和半合成酯衍生物的合成,活性和代谢。FA和带有游离C-3 OH的衍生物分子经过物种特异性的代谢,生成相应的3-OH表差异构体3-表观吡啶酸(3-epiFA)。FA还在大鼠血浆中代谢形成FA内酯。这些新陈代谢的途径可能有助于在啮齿动物中观察到更快速的FA清除。C-3烷基和芳基酯起FA的经典前药作用,在微粒体,血浆和结核分枝杆菌培养物中被水解成FA。相反,C-3硅酸酯和C-21酯对水解呈惰性,因此不充当前药。C-3硅酸酯的抗分枝杆菌活性与FA相当,并且这些化合物在微粒体和血浆中稳