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Dermal macrophage

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Dermal macrophages are macrophages in the skin that facilitate skin homeostasis by mediating wound repair, hair growth, and salt balance. Their functional role in these processes is the mediator of inflammation. They can acquire an M1 or M2 phenotype to promote or suppress an inflammatory response, thereby influencing other cells' activity via the production of pro-inflammatory or anti-inflammatory cytokines. Dermal macrophages' ability to acquire pro-inflammatory properties also potentiates them in cancer defence. M1 macrophages can suppress tumour growth in the skin by their pro-inflammatory properties. However, M2 macrophages support tumour growth and invasion by the production of Th2 cytokines such as TGFβ and IL-10. Thus, the exact contribution of each phenotype to cancer defence and the skin's homeostasis is still unclear.