Journal of Microbiology

A-Rum Shin

2 Articles

Lithium Inhibits Growth of Intracellular Mycobacterium kansasii through Enhancement of Macrophage Apoptosis: Hosung Sohn , Kwangwook Kim , Kil-Soo Lee , Han-Gyu Choi , Kang-In Lee , A-Rum Shin , Jong-Seok Kim , Sung Jae Shin , Chang-Hwa Song , Jeong-Kyu Park , Hwa-Jung Kim; J. Microbiol. 2014;52(4):299-306. Published online February 17, 2014; DOI: https://doi.org/10.1007/s12275-014-3469-6

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Mycobacterium kansasii (Mk) is an emerging pathogen that causes a pulmonary disease similar to tuberculosis. Macrophage apoptosis contributes to innate host defense against mycobacterial infection. Recent studies have suggested that lithium significantly enhances the cytotoxic activity of death stimuli in many cell types. We examined the effect of lithium on the viability of host cells and intracellular Mk in infected macrophages. Lithium treatment resulted in a substantial reduction in the viability of intracellular Mk in macrophages. Macrophage cell death was significantly enhanced after adding lithium to Mk-infected cells but not after adding to uninfected macrophages. Lithium-enhanced cell death was due to an apoptotic response, as evidenced by augmented DNA fragmentation and caspase activation. Reactive oxygen species were essential for lithium-induced apoptosis. Intracellular scavenging by N-acetylcysteine abrogated the lithiummediated decrease in intracellular Mk growth as well as apoptosis. These data suggest that lithium is associated with control of intracellular Mk growth through modulation of the apoptotic response in infected macrophages.

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Characterization and Identification of Distinct Mycobacterium massiliense Extracellular Proteins from Those of Mycobacterium abscessus: A-Rum Shin , Hosung Sohn , Choul Jae Won , Byungsoo Lee , Woo Sik Kim , Hyun Bae Kang , Hwa-Jung Kim , Sang Nae Cho , Sung Jae Shin; J. Microbiol. 2010;48(4):502-511. Published online August 20, 2010; DOI: https://doi.org/10.1007/s12275-010-0038-5

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Abstract PDF

Mycobacterium massiliense is an emerging pathogen and very similar to Mycobacterium abscessus of rapidly growing mycobacteria in the phenotype and genotype. Pathogenic bacteria secrete a diversity of factors into extracellular medium which contribute to the bacterial pathogenicity. In the present study, we performed the comparative proteome analysis of culture filtrate proteins from a clinical isolate of M. massiliense and M. abscessus strains using two-dimensional gel electrophoresis and liquid chromatography-electrospray ionization mass spectrometry (LC-ESI-MS). Interestingly, 9 proteins of M. massiliense were distinctly expressed from those of M. abscessus. Bioinformatic analysis of the identified proteins revealed that 3 unique proteins corresponded to serine/arginine rich protein, membrane protein from Streptomyces coelicolor, and one hypothetical protein from Corynebacterium efficiens YS-314, respectively. Culture filtrate proteins from M. massiliense induced the release of pro-inflammatory cytokines from macrophages in a dose-dependent manner but not that from M. abscessus. Taken together, the functional study on the identified proteins uniquely produced from M. massiliense may provide not only the clues for the different pathogensis, but also help develop the diagnostic tools for the differentiation between two mycobacterial species.

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