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Published online before print March 21, 2006

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© by The Society for Leukocyte Biology
Journal of Leukocyte Biology, doi:10.1189/jlb.1005616

Received for publication October 28, 2005.
Revised December 21, 2005.
Accepted for publication January 12, 2006.

Article

LTA recognition by bovine T cells involves CD36

Veterinary Molecular Biology, Montana State University, Bozeman

^@ To whom correspondence should be addressed. E-mail: uvsmj{at}montana.edu.

	Abstract

CD36 has recently been shown to facilitate monocyte Toll-like receptor 2 (TLR2) recognition of lipoteichoic acid (LTA), much like CD14 in TLR4 recognition of lipopolysaccharide. We previously found that bovine T cells express CD36 transcripts. Here, we tested whether bovine T cells express CD36 protein and if so, whether it functions in a manner similar to the monocyte molecule. CD36 transcripts and internal and cell surface protein could be detected in resting, sorted T cells. Phorbol 12-myristate 13-acetate (PMA)/ionomycin treatment increased CD36 transcript levels (detectable at 4 h) and protein expression (internal and cell surface). Increased surface antigen expression was detectable by 24 h and was maximal at 72 h following PMA/ionomycin stimulation. Anti-CD36 monoclonal antibody inhibited increased macrophage-inflammatory protein-1 gene expression in T cells activated by LTA. In conclusion, T cells express CD36, previously thought to be a myeloid and endothelial cell-restricted surface antigen, and it contributes to responses by these cells to microbial LTA.

Key Words: innate • scavenger receptor • Toll-like receptors • PAMP

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