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Survival of ovarian carcinoma is associated with the abundance of immunosuppressed CD163highCD206high tumour-associated macrophages (TAMs) and high levels of arachidonic acid (AA) in the tumour microenvironment. Here, the study shows that both associations are functionally linked. Transcriptional profiling revealed that high CD163 and CD206/MRC1 expression in TAMs is strongly associated with inhibiting cytokine‐triggered signalling. The inhibition of its incorporation into phospholipids did not affect the AA‐mediated interference with STAT1 phosphorylation. Inhibition of interferon‐triggered STAT1 phosphorylation by AA was reversed by water‐soluble cholesterol, known to prevent the AA's perturbation of lipid raft structure. These findings suggest that the pharmacologic restoration of lipid raft functions in TAMs may contribute to developing new therapeutic approaches.
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