Journal
CELL AND TISSUE RESEARCH
Volume 390, Issue 1, Pages 51-57Publisher
SPRINGER
DOI: 10.1007/s00441-022-03671-4
Keywords
TLR; Pneumonia; Lung inflammation; Asthma; Human lung
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada
- Natural Sciences and Engineering Research Council's Integrated Training Program in Infectious Diseases, Food Safety and Public Policy
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TLR10 plays a significant role in the innate immune response to Streptococcus pneumoniae infection, with knockdown affecting the expression of various inflammatory cytokines and NF-κB nuclear translocation.
Toll-like receptors (TLRs) are evolutionarily conserved pathogen-associated molecular pattern recognition receptors, and play a critical role in early response against invading pathogens. Even though TLRs have been widely studied, very little is known about the expression and function of TLR10. Till date, neither any data are available on expression of TLR10 in human lungs nor there is any information on function of TLR10 in macrophages. Streptococcus pneumoniae are Gram-positive, alpha-hemolytic, and major causative agent of pneumonia, ear infections, sinus infections, and meningitis. We examined the role of TLR10 in innate immune response to S. pneumoniae infection in U937 cell line-derived human macrophages. We found a significant increase in TLR10 mRNA and protein expression in S. pneumoniae challenged macrophages. TLR10 knockdown resulted in significant reduction of IL-1 beta, IL-8, IL-17, and TNF-alpha but not IL-10 expression in infected macrophages. TLR10 knockdown in macrophages reduced nuclear translocation of NF-kappa B during S. pneumoniae challenge but did not affect the phagocytosis of the bacteria. Taken together, we report the first data on TLR10's role in macrophage response against S. pneumoniae.
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