| Leptospira interrogans induces apoptosis in macrophages via caspase-8- and caspase-3-dependent pathways. | |
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MedLine Citation:
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PMID: 19029301 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Apoptosis of host cells plays an important role in modulating the pathogenesis of many infectious diseases. It has been reported that Leptospira interrogans, the causal agent of leptospirosis, induces apoptosis in macrophages and hepatocytes. However, the molecular mechanisms responsible for host cell death remained largely unknown. Here we demonstrate that L. interrogans induced apoptosis in a macrophage-like cell line, J774A.1, and primary murine macrophages in a time- and dose-dependent manner. Apoptosis was associated with the activation of cysteine aspartic acid-specific proteases (caspase-3, caspase-6, and caspase-8), the increased expression of Fas-associated death domain (FADD), and the cleavage of the caspase substrates poly(ADP-ribose) polymerase (PARP) and nuclear lamina protein (lamin A and lamin C). Caspase-9 was activated to a lesser extent, whereas no release of cytochrome c from mitochondria was detectable. Inhibition of caspase-8 impaired L. interrogans-induced caspase-3 and -6 activation, as well as PARP and lamin A/C cleavage and apoptosis, suggesting that apoptosis is initiated via caspase-8 activation. Furthermore, caspase-3 was required for the activation of caspase-6 and seemed to be involved in caspase-9 activation through a feedback amplification loop. These data indicate that L. interrogans-induced apoptosis in macrophages is mediated by caspase-3 and -6 activation through a FADD-caspase-8-dependent pathway, independently of mitochondrial cytochrome c-caspase-9-dependent signaling. |
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Authors:
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Dandan Jin; David M Ojcius; Dexter Sun; Haiyan Dong; Yihui Luo; Yafei Mao; Jie Yan |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-11-24 |
Journal Detail:
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Title: Infection and immunity Volume: 77 ISSN: 1098-5522 ISO Abbreviation: Infect. Immun. Publication Date: 2009 Feb |
Date Detail:
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Created Date: 2009-01-19 Completed Date: 2009-02-20 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 0246127 Medline TA: Infect Immun Country: United States |
Other Details:
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Languages: eng Pagination: 799-809 Citation Subset: IM |
Affiliation:
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School of Life Sciences, Department of Medical Microbiology and Parasitology, School of Medicine, Zhejiang University, 388 Yu-Hang-Tang Road, Hangzhou 310058, China. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Apoptosis / physiology* Caspase 3 / metabolism* Caspase 8 / metabolism* Cell Line Cell Survival Cytochromes c / metabolism Fas-Associated Death Domain Protein / metabolism Gene Expression Regulation / physiology Humans Leptospira interrogans / physiology* Macrophages / cytology, enzymology* Male Mice Mice, Inbred BALB C |
| Chemical | |
Reg. No./Substance:
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0/Fas-Associated Death Domain Protein; 9007-43-6/Cytochromes c; EC 3.4.22.-/Caspase 3; EC 3.4.22.-/Caspase 8 |
| Comments/Corrections | |
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