期刊
JOURNAL OF LEUKOCYTE BIOLOGY
卷 99, 期 5, 页码 771-780出版社
FEDERATION AMER SOC EXP BIOL
DOI: 10.1189/jlb.4A0815-346R
关键词
bacterial DNA; cell signaling; cytokine
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Fundacao de Amparo a Pesquisa do estado de Minas Gerais (FAPEMIG)
- CNPq/Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- FAPEMIG/CNPq (PRONEX)
- CAPES/Programa Nacional de Pos Doutorado (PNPD)
- CNPq/CT-Biotec
- CNPq/Centro Brasileiro-Argentino de Biotecnologia (CBAB)
- U.S. National Institutes of Health [R01 AI116453]
Brucella abortus is a Gram-negative intracellular bacterial pathogen that causes a zoonosis of worldwide occurrence, leading to undulant fever in humans and abortion in domestic animals. B. abortus is recognized by several pattern-recognition receptors triggering pathways during the host innate immune response. Therefore, here, we determined the cooperative role of TLR9 with TLR2 or TLR6 receptors in sensing Brucella. Furthermore, we deciphered the host innate immune response against B. abortus or its DNA, emphasizing the role of TLR9-MAPK/NF-kappa B signaling pathways in the production of proinflammatory cytokines. TLR9 is required for the initial host control of B. abortus, but this TLR was dispensable after 6 wk of infection. The susceptibility of TLR9(-/-)-infected animals to Brucella paralleled with lower levels of IFN-gamma produced by mouse splenocytes stimulated with this pathogen compared with wild-type cells. However, no apparent cooperative interplay was observed between TLR2-TLR9 or TLR6-TLR9 receptors to control infection. Moreover, B. abortus or its DNA induced activation of MAPK/NF-kappa B pathways and production of IL-12 and TNF-alpha by macrophages partially dependent on TLR9 but completely dependent on MyD88. In addition, B. abortus-derived CpG oligonucleotides required TLR9 to promote IL-12 and TNF-alpha production by macrophages. By confocal microscopy, we demonstrated that TLR9 redistributed and colocalized with lysosomal-associated membrane protein-1 upon Brucella infection. Thus, B. abortus induced TLR9 traffic, leading to cell signaling activation and IL-12 and TNF-alpha production. Although TLR9 recognized Brucella CpG motifs, our results suggest a new pathway of B. abortus DNA-activating macrophages independent of TLR9.
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