MyD88, but not toll-like receptors 4 and 2, is required for efficient clearance of Brucella abortus.

Abstract:

:It is not clear how the host initially recognizes and responds to infection by gram-negative pathogenic Brucella spp. It was previously shown (D. S. Weiss, B. Raupach, K. Takeda, S. Akira, and A. Zychlinsky, J. Immunol. 172:4463-4469, 2004) that the early macrophage response against gram-negative bacteria is mediated by Toll-like receptor 4 (TLR4), which signals in response to lipopolysaccharide (LPS). Brucella, however, has a noncanonical LPS which does not have potent immunostimulatory activity. We evaluated the kinetics of TLR4 activation and the cytokine response in murine macrophages after Brucella infection. We found that during infection of macrophages, Brucella avoids activation of TLR4 at 6 h but activates TLR4, TLR2, and myeloid differentiation factor 88 (MyD88) at 24 h postinfection. Interestingly, even though its activation is delayed, MyD88 is important for host defense against Brucella infection in vivo, since MyD88(-/-) mice do not clear the bacteria as efficiently as wild-type, TLR4(-/-), TLR2(-/-), or TLR4/TLR2(-/-) mice.

journal_name

Infect Immun

journal_title

Infection and immunity

authors

Weiss DS,Takeda K,Akira S,Zychlinsky A,Moreno E

doi

10.1128/IAI.73.8.5137-5143.2005

keywords:

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

5137-43

issue

8

eissn

0019-9567

issn

1098-5522

pii

73/8/5137

journal_volume

73

pub_type

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