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FEBS Lett. 2006 May 1;580(10):2517-22. Epub 2006 Apr 7.

Suppression of Mycobacterium tuberculosis induced reactive oxygen species (ROS) and TNF-alpha mRNA expression in human monocytes by allicin.

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  • 1Department of Biochemistry, Faculty of Medicine, J.N. Medical College, A.M.U., Aligarh 202002, U.P., India.


Chronic inflammation associated with tumor necrosis factor (TNF)-alpha and reactive oxygen species (ROS) is the hallmark of tuberculosis. Mycobacterium tuberculosis (MTB) directly stimulates human monocytes to secrete TNF-alpha. We show the augmented expression of TNF-alpha mRNA in MTB-infected monocytes by cellular activation and ROS was suppressed by allicin in a dose-dependent manner. Also, allicin enhanced the glutathione peroxidase activity, which correlated inversely with the downregulation of ROS and TNF-alpha in MTB-infected monocytes. Hence, allicin may prove to be a valuable natural antioxidant in combating tuberculosis.

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