A marked difference in pathogenesis and immune response induced by different Mycobacterium tuberculosis genotypes

被引:364
作者
López, B
Aguilar, D
Orozco, H
Burger, M
Espitia, C
Ritacco, V
Barrera, L
Kremer, K
Hernandez-Pando, R
Huygen, K
Van Soolingen, D
机构
[1] Inst Nacl Nutr Salvador Zubiran, Dept Pathol, Mexico City 14000, DF, Mexico
[2] Natl Adm Hlth Labs, Natl Inst Infect Dis, Buenos Aires, DF, Argentina
[3] Inst Carlos G Malbran, Buenos Aires, DF, Argentina
[4] Natl Inst Publ Hlth & Environm, Mycobacteria Reference Dept, Diagnost Lab Infect Dis & Perinatal Screening, NL-3720 BA Bilthoven, Netherlands
[5] Univ Nacl Autonoma Mexico, Dept Immunol, Inst Biomed Res, Mexico City, DF, Mexico
[6] Inst Pasteur Brussels, Brussels, Belgium
基金
英国惠康基金;
关键词
D O I
10.1046/j.1365-2249.2003.02171.x
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
In the last decade, an unprecedented genetic diversity has been disclosed among Mycobacterium tuberculosis strains found worldwide. However, well-conserved genotypes seem to prevail in areas with high incidence of tuberculosis. As this may be related to selective advantages, such as advanced mechanisms to circumvent [M. bovis Bacille Calmette-Guerin (BCG)-induced] host defence mechanisms, we investigated the influence of strain diversity on the course of experimental disease. Twelve M. tuberculosis strains, representing four major genotype families found worldwide today, and the laboratory strain H37Rv were each used to infect BALB/c mice by direct intratracheal injection. Compared with H37Rv, infections with Beijng strains were characterized by extensive pneumonia, early but ephemeral tumour necrosis factor-alpha (TNF-alpha ) and inducible isoform of nitric oxide synthetase (iNOS) expression, and significantly higher earlier mortality. Conversely, Canetti strains induced limited pneumonia, sustained TNF-alpha and iNOS expression in lungs, and almost 100% survival. Strains of the Somali and the Haarlem genotype families displayed less homogeneous, intermediate rates of survival. Previous BCG vaccination protected less effectively against infection with Beijing strains than against the H37Rv strain. In conclusion, genetically different M. tuberculosis strains evoked markedly different immunopathological events. Bacteria with the Beijing genotype, highly prevalent in Asia and the former USSR, elicited a non-protective immune response in mice and were the most virulent. Future immunological research, particularly on candidate vaccines, should include a broad spectrum of M. tuberculosis genotypes rather than a few laboratory strains.
引用
收藏
页码:30 / 37
页数:8
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