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Change of Gene Expression Pattern of Mycobacterium tuberculosis H37Rv Against Host Immune Response in Infected Mouse Lung  

Lee, Hyo-Ji (Department of Biological Science and Medical & Bio-Materials Research Center, Kangwon National University)
Cho, Jung-Hyun (Department of Biological Science and Medical & Bio-Materials Research Center, Kangwon National University)
Kang, Su-Jin (Department of Biological Science and Medical & Bio-Materials Research Center, Kangwon National University)
Jung, Yu-Jin (Department of Biological Science and Medical & Bio-Materials Research Center, Kangwon National University)
Publication Information
Korean Journal of Microbiology / v.46, no.2, 2010 , pp. 134-139 More about this Journal
Abstract
Mycobacterium tuberculosis (Mtb) is one of the most successful pathogens to infect one third of world population. Th1-mediated immunity against Mtb infection is known as critical to express mycobacteriostatic function but it is not sufficient to resolve the infection. In this study, to verify the possibility Mtb itself change the gene expression to survive against host immune response, expression pattern of selected H37Rv genes, 16S rRNA, acr, fbpA, aceA, and ahpC, during the course of infection was measured with absolute quantitation method using real-time RT-PCR. The total number of transcripts of 16S rRNA increased during the course of infection, which was coincide with the increasing CFU. The total number of fbpA transcripts per CFU, which encode typical secreted Mtb antigen, Ag85A, increased for 10 days of infection before decreasing. The number of transcripts of acr per CFU, which encode heat shock protein, ${\alpha}$-crystallin, increased during the infection, and ahpC and aceA, they both are enzymes produced in oxidative stressful condition, increased for 20 days and then slightly decreased on day 30. These findings are one of survival strategy of pathogen evading host immune response lead to persistent infection inside host cells.
Keywords
absolute quantification; H37Rv; gene expression; M. tuberculosis; real-time PCR;
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