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Published on: July 26, 2017
Cell-specific expression of TLR9 isoforms in inflammation.
Kelly J McKelvey1, John Highton, Paul A Hessian
1Department of Physiology, Otago School of Medical Sciences, University of Otago, PO Box 913, Dunedin 9054, New Zealand. mckke191@student.otago.ac.nz
Different Toll-like receptor 9 (TLR9) isoforms are expressed by immune cells, influencing inflammation. B-lymphocytes predominantly express TLR9-A, while T-lymphocytes and monocytes express TLR9-C, impacting inflammatory responses.
Area of Science:
- Immunology
- Molecular Biology
Background:
- Toll-like receptors (TLRs) are crucial for innate immunity.
- Five human TLR9 isoforms exist, with potential for differential roles in immune responses.
Purpose of the Study:
- To investigate the differential expression of human TLR9 isoforms (TLR9-A, -C, -D) in various immune cells and tissues.
- To understand the contribution of TLR9 isoforms to inflammatory processes.
Main Methods:
- Assessed molecular expression of TLR9 isoforms in normal peripheral blood mononuclear cells (PBMCs).
- Analyzed TLR9 protein expression in rheumatoid inflammatory lesions.
- Utilized structure modeling for subcellular localization predictions of TLR9-B and TLR9-D.
Main Results:
- B-lymphocytes show significantly higher TLR9-A transcript levels compared to monocytes and T-lymphocytes, which express TLR9-C.
- Isoform predominance shifts during B-lymphocyte development.
- Differential TLR9 isoform expression in immune cells correlates with TLR9 protein levels in rheumatoid arthritis tissues, with distinct isoform contributions in synovium versus nodules.
Conclusions:
- Human TLR9 isoform expression varies across immune cell types and is altered in inflammatory conditions.
- Specific TLR9 isoforms, like TLR9-A and TLR9-C, are differentially associated with immune cell populations and inflammatory site characteristics.
- Potential for distinct TLR9 isoforms (TLR9-B, TLR9-D) to interact with alternative ligands and localize to different subcellular compartments warrants further investigation.
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