Type I interferon induction is detrimental during infection with the Whipple's disease bacterium, Tropheryma whipplei.
PLoS Pathog
; 6(1): e1000722, 2010 Jan 15.
Article
en En
| MEDLINE
| ID: mdl-20090833
ABSTRACT
Macrophages are the first line of defense against pathogens. Upon infection macrophages usually produce high levels of proinflammatory mediators. However, macrophages can undergo an alternate polarization leading to a permissive state. In assessing global macrophage responses to the bacterial agent of Whipple's disease, Tropheryma whipplei, we found that T. whipplei induced M2 macrophage polarization which was compatible with bacterial replication. Surprisingly, this M2 polarization of infected macrophages was associated with apoptosis induction and a functional type I interferon (IFN) response, through IRF3 activation and STAT1 phosphorylation. Using macrophages from mice deficient for the type I IFN receptor, we found that this type I IFN response was required for T. whipplei-induced macrophage apoptosis in a JNK-dependent manner and was associated with the intracellular replication of T. whipplei independently of JNK. This study underscores the role of macrophage polarization in host responses and highlights the detrimental role of type I IFN during T. whipplei infection.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Transducción de Señal
/
Interferón Tipo I
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Apoptosis
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Perfilación de la Expresión Génica
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Enfermedad de Whipple
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Macrófagos
Límite:
Animals
Idioma:
En
Año:
2010
Tipo del documento:
Article