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Expression of Toll-like receptor 2 on human Schwann cells: a mechanism of nerve damage in leprosy.

TitleExpression of Toll-like receptor 2 on human Schwann cells: a mechanism of nerve damage in leprosy.
Publication TypeJournal Article
Year of Publication2003
AuthorsOliveira RB, Ochoa MT, Sieling PA, Rea TH, Rambukkana A, Sarno EN, Modlin RL
JournalInfect Immun
Date Published2003 Mar
KeywordsApoptosis, Cells, Cultured, DNA Damage, Drosophila Proteins, Humans, Immunity, Innate, Leprosy, Lipoproteins, Membrane Glycoproteins, Receptors, Cell Surface, Schwann Cells, Toll-Like Receptor 2, Toll-Like Receptors

Nerve damage is a clinical hallmark of leprosy and a major source of patient morbidity. We investigated the possibility that human Schwann cells are susceptible to cell death through the activation of Toll-like receptor 2 (TLR2), a pattern recognition receptor of the innate immune system. TLR2 was detected on the surface of human Schwann cell line ST88-14 and on cultured primary human Schwann cells. Activation of the human Schwann cell line and primary human Schwann cell cultures with a TLR2 agonist, a synthetic lipopeptide comprising the N-terminal portion of the putative Mycobacterium leprae 19-kDa lipoprotein, triggered an increase in the number of apoptotic cells. The lipopeptide-induced apoptosis of Schwann cells could be blocked by an anti-TLR2 monoclonal antibody. Schwann cells in skin lesions from leprosy patients were found to express TLR2. It was possible to identify in the lesions Schwann cells that had undergone apoptosis in vivo. The ability of M. leprae ligands to induce the apoptosis of Schwann cells through TLR2 provides a mechanism by which activation of the innate immune response contributes to nerve injury in leprosy.

Alternate JournalInfect. Immun.
PubMed ID12595460
PubMed Central IDPMC148832
Grant ListAI07126 / AI / NIAID NIH HHS / United States
AI22553 / AI / NIAID NIH HHS / United States
AI45816 / AI / NIAID NIH HHS / United States
AI47866 / AI / NIAID NIH HHS / United States
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