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- W1976496987 abstract "TLR recognition activates the secretion of pro- and anti-inflammatory cytokines and it also modulates the expression of crucial molecules involved in phagocytosis and antimicrobial activity. Scavenger receptors can act as TLR co-receptors or facilitate antigen loading. However, it remains unknown whether TLR can modulate the expression of these scavenger receptors. We stimulated human peripheral blood mononuclear cells (PBMC) with TLR2 (Pam3CSK4 and FSL1) and TLR4 ligand lipopolysaccharide (LPS) and then analyzed CD36 expression on different monocyte subpopulations by flow cytometry. TLR2 and TLR4 ligands can downregulate CD36 on the surface of monocytes, guiding the protein to intracellular compartments. Even though TLR-activation induced TNFα, IL-10 and IL-6 production, only recombinant TNFα was able to downregulate CD36. Neutralizing anti-TNFα antibodies showed that the Pam3CSK4 and FSL1-induced downregulation was partially mediated by TNFα but not by IL-6 or IL-10. However, LPS-induced downregulation could have also been caused by direct TLR4 targeting and signaling, and/or mediated by other unknown factors. CD36 downregulation reduced the capability of monocytes to phagocyte apoptotic neutrophils. In conclusion, modulation of scavenger receptor expression by TLR targeting on monocytes has functional consequences. Characterization this complex regulation may help us to understand this innate response and develop specific therapeutic drugs for each mechanism." @default.
- W1976496987 created "2016-06-24" @default.
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- W1976496987 date "2012-10-01" @default.
- W1976496987 modified "2023-10-15" @default.
- W1976496987 title "Functional consequences of CD36 downregulation by TLR signals" @default.
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- W1976496987 doi "https://doi.org/10.1016/j.cyto.2012.06.020" @default.
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