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- W4313373090 abstract "Abstract Macrophages are a highly plastic population of innate immunity with diverse functions in homeostasis. Despite their relative abundance in tumor microenvironment (TME), the exact function of tumor-associated macrophages (TAMs) and how they are regulated remain largely unknown. Macrophages also play key roles in lipid metabolism, disruption of which can result in pathologies such as atherosclerosis. Interestingly, TME has also been characterized as a lipid-rich context, we are interested in understanding how lipids in TME affect TAMs’ pro- or anti-tumor function. Here, we firstly characterized the lipid metabolic phenotype of TAMs in a mouse melanoma model. We found that up-regulation of lipid storage and uptake is associated with the most tolerogenic TAM subset marked by high level of F4/80. We also found high expression of scavenger receptor CD36 on F4/80hi TAMs which mediates uptake of oxidized LDL (oxLDL) from TME. Using germ line knockout (Cd36−/−) and myeloid-specific deficiency (Cd36 flox/flox x Csf1r-Cre) mouse models, we observed that uptake of oxLDL by TAMs was significantly blocked, along with rescued immunosuppressive phenotype characterized by decreased expression of PD-L1, CD206 and elevated secretion of TNFa, which together contribute to slower tumor growth. We further conducted single-cell RNA sequencing on Cd36−/− and wild-type TAMs, and found several pathways as potential mechanisms for CD36-mediated pro-tumor phenotype. In conclusion, we discovered that high expression of CD36 on TAMs mediates uptake of oxLDL and contribute to pro-tumor function. Our data suggests that metabolites in TME may play crucial roles in metabolic and functional reprogramming of tumor-infiltrating immune populations." @default.
- W4313373090 created "2023-01-06" @default.
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- W4313373090 date "2020-05-01" @default.
- W4313373090 modified "2023-09-27" @default.
- W4313373090 title "The role of CD36 in macrophage lipid metabolism and function in tumor microenvironment" @default.
- W4313373090 doi "https://doi.org/10.4049/jimmunol.204.supp.240.9" @default.
- W4313373090 hasPublicationYear "2020" @default.
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