کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1963603 | 1058481 | 2013 | 11 صفحه PDF | دانلود رایگان |

• TLR2-ligand porin stimulated TLR1 and TLR4 of TLR2 down-regulated HT-29 cells.
• Porin induced MD-2, the TLR4 co-receptor known for LPS mediated signaling.
• SARM-1 showed central role in TLR signaling for colonic HT-29 cell response.
• Chemokine expression of the colon cells putatively regulated immune cell migration.
Although pathogenic bacteria penetrate colonic cells causing infection, the role of its surface molecules serving as key Toll-like receptor (TLR) ligands and triggering response remains unexplored. We show that TLR2-ligand porin up-regulated TLR4 on HT-29 cells, which the TLR4-ligand LPS could not. TLR1 that co-express with TLR2 got stimulated with TLR4. Besides the two TLRs, MD-2 was expressed revealing that the TLR4 co-receptor is not exclusive for LPS signaling. SARM-1 that mostly down-regulates TLR-signaling, demonstrated central role in signaling by engaging IRF-3 and NF-κB for cell activity. Porin induced type 1 chemokines particularly MCP-3, while porin-stimulated HT-29 culture supernatant displayed PBMC migration, collectively suggesting that the chemokines influence colon and immune cell cross-talk. In TLR2 down-regulated HT-29 cells, we found TLR1 and TLR4 as substitute TLRs to identify porin and orchestrate signaling. Thus, TLR replacement for PAMP recognition demonstrates specificity of ligand·TLR association can compromise and is a necessary alternative for successful execution of immune responses.
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Journal: Cellular Signalling - Volume 25, Issue 8, August 2013, Pages 1678–1688