期刊
IMMUNOBIOLOGY
卷 217, 期 10, 页码 972-981出版社
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.imbio.2012.01.009
关键词
Listeria monocytogene; Listeriolysin O; Heterogeneous nuclear ribonucleoprotein; M; Immune response; Listeiosis
类别
资金
- National Natural Science Foundation of China [30725026, 31072117]
- National Basic Research Program of China [2006CB504303]
Listeriolysin O (LLO) is a key virulence factor secreted by the Gram-positive, facultative intracellular pathogen Listeria monocytogenes (LM). Its role in host cell response is still not very clear. Using pull-down assay, mass spectrometry analysis and immunoprecipitation approaches, we found that LLO interacted with heterogeneous nuclear ribonucleoprotein M (hnRNPM), a member of RNA splicing complex apparatus, and the binding domain of LLO for hnRNP M was located between amino acids 26 and 176. Knockdown of hnRNP M inhibited LLO-induced activation of IFN-alpha, IFN-beta and AP-1 promoters and enhanced LM growth in host cells. Thus, engagement of hnRNP M with LLO induces type I interferon expression and restricts LM growth in host cells, suggesting a critical role of hnRNP M in LLO-induced immune responses in host cells. These findings will contribute to further understandings of the molecular mechanisms underlying the host defense against LM infection. Crown Copyright (c) 2012 Published by Elsevier GmbH. All rights reserved.
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