[No authors listed]
We have provided a detailed structural analysis of porcine alveolar macrophage TLR3 extracellular domain (ECD). The porcine TLR3-ECD contains 18 leucine-rich repeats (LRRs) consisting of blocks of consensus motifs and non-consensus motifs containing insertions. Excluding the N-terminal and C-terminal LRRs, porcine TLR3 has two LRRs with insertions, resulting in one LRR of 39 amino acids and another LRR of 34 amino acids. Furthermore, we have conducted the first examination of the regulated expression of porcine alveolar macrophage TLR3 during in vivo co-infection with influenza virus and Bordetella bronchiseptica. There was a bi-phasic upregulation of porcine TLR3 during influenza virus infection (day 1 and day 10 post-infection). Co-infection resulted in an enhanced expression of porcine TLR3 only at day 1 post-infection. Interestingly, B. bronchiseptica induced an upregulation in alveolar macrophage TLR3 expression at day 10 post-infection. Based on our work and that of others, TLR3 likely plays a key role in the immune response of lung cells to influenza virus infection in several mammalian species.
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