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KMID : 0364820100460020134
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Korean Journal of Microbiology
2010 Volume.46 No. 2 p.134 ~ p.139
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Change of Gene Expression Pattern of Mycobacterium tuberculosis H37Rv Against Host Immune Response in Infected Mouse Lung
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Lee Hyo-Ji
Cho Jung-Hyun
Kang Su-Jin
Jung Yu-Jin
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Abstract
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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, α-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.
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KEYWORD
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absolute quantification, H37Rv, gene expression, M. tuberculosis, real-time PCR
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