Activation and regulation of Toll-like receptors 2 and 1 in human leprosy - PubMed (original) (raw)

doi: 10.1038/nm864. Epub 2003 Apr 14.

Maria Teresa Ochoa, Peter A Sieling, Satoshi Uematsu, Yolanda W Ng, Annaliza Legaspi, Philip T Liu, Stewart T Cole, Paul J Godowski, Yumi Maeda, Euzenir N Sarno, Michael V Norgard, Patrick J Brennan, Shizuo Akira, Thomas H Rea, Robert L Modlin

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Activation and regulation of Toll-like receptors 2 and 1 in human leprosy

Stephan R Krutzik et al. Nat Med. 2003 May.

Abstract

The expression and activation of Toll-like receptors (TLRs) was investigated in leprosy, a spectral disease in which clinical manifestations correlate with the type of immune response mounted toward Mycobacterium leprae. TLR2-TLR1 heterodimers mediated cell activation by killed M. leprae, indicating the presence of triacylated lipoproteins. A genome-wide scan of M. leprae detected 31 putative lipoproteins. Synthetic lipopeptides representing the 19-kD and 33-kD lipoproteins activated both monocytes and dendritic cells. Activation was enhanced by type-1 cytokines and inhibited by type-2 cytokines. In addition, interferon (IFN)-gamma and granulocyte-macrophage colony-stimulating factor (GM-CSF) enhanced TLR1 expression in monocytes and dendritic cells, respectively, whereas IL-4 downregulated TLR2 expression. TLR2 and TLR1 were more strongly expressed in lesions from the localized tuberculoid form (T-lep) as compared with the disseminated lepromatous form (L-lep) of the disease. These data provide evidence that regulated expression and activation of TLRs at the site of disease contribute to the host defense against microbial pathogens.

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