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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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The radioprotective 105/MD-1 complex links TLR2 and TLR4/MD-2 in antibody response to microbial membranes.

Low-affinity IgG3 Abs to microbial membranes are important for primary immune defense against microbes, but little is known about the importance of TLRs in their production. IgG3 levels were extremely low in mice lacking radioprotective 105 ( RP105), a B cell surface molecule structurally related to TLRs. RP105(-/-) B cells proliferated poorly in response to not only the TLR4 ligand LPS but also TLR2 ligand lipoproteins, both of which mediate the immunostimulatory activity of microbial membranes. RP105(-/-) mice were severely impaired in hapten-specific Ab production against LPS or lipoproteins. CD138 (syndecan-1)-positive plasma cells were detected after lipid A injection in wild-type spleen but much less in RP105(-/-) spleen. RP105 ligation in vivo induced plasma cell differentiation. RP105 expression was approximately 3-fold higher on marginal zone B cells than on follicular and B1 cells and was down-regulated on germinal center cells. These results demonstrate that a signal via RP105 is uniquely important for regulating TLR-dependent Ab production to microbial membranes.[1]

References

  1. The radioprotective 105/MD-1 complex links TLR2 and TLR4/MD-2 in antibody response to microbial membranes. Nagai, Y., Kobayashi, T., Motoi, Y., Ishiguro, K., Akashi, S., Saitoh, S., Kusumoto, Y., Kaisho, T., Akira, S., Matsumoto, M., Takatsu, K., Miyake, K. J. Immunol. (2005) [Pubmed]
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