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Infection and Immunity, September 2007, p. 4351-4356, Vol. 75, No. 9
0019-9567/07/$08.00+0     doi:10.1128/IAI.01642-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Borrelia garinii Induces CXCL13 Production in Human Monocytes through Toll-Like Receptor 2

Departments of Neurology,¹ Microbiology, Ludwig-Maximilians University, Marchioninistr. 15, 81377 Munich, Germany,³ Microbiology, Technical University Munich, Pettenkoferstr. 9a, 80336 Munich, Germany²

Received 11 October 2006/ Returned for modification 15 November 2006/ Accepted 5 June 2007

Recent studies have suggested an important role for the B-cell-attracting chemokine CXCL13 in the B-cell-dominated cerebrospinal fluid (CSF) infiltrate in patients with neuroborreliosis (NB). High levels of CXCL13 were present in the CSF of NB patients. It has not been clear, however, whether high CSF CXCL13 titers are specific for NB or are a characteristic of other spirochetal diseases as well. Furthermore, the mechanisms leading to the observed CXCL13 expression have not been identified yet. Here we describe similarly elevated CSF CXCL13 levels in patients with neurosyphilis, while pneumococcal meningitis patient CSF do not have high CXCL13 levels. In parallel, challenge of human monocytes in vitro with two of the spirochetal causative organisms, Borrelia garinii (the Borrelia species most frequently found in NB patients) and Treponema pallidum, but not challenge with pneumococci, induced CXCL13 release. This finding implies that a common spirochetal motif is a CXCL13 inducer. Accordingly, we found that the lipid moiety N-palmitoyl-S-(bis[palmitoyloxy]propyl)cystein (Pam₃C) (three palmitoyl residues bound to N-terminal cysteine) of the spirochetal lipoproteins is critical for the CXCL13 induction in monocytes. As the Pam₃C motif is known to signal via Toll-like receptor 2 (TLR2) and an anti-TLR2 monoclonal antibody blocked CXCL13 production of human monocytes incubated with B. garinii, this suggests that TLR2 is a major mediator of Borrelia-induced secretion of CXCL13 from human monocytes.

Published ahead of print on 11 June 2007.

Editor: R. P. Morrison