Abstract
Omega-3 polyunsaturated fatty acids (n-3 PUFAs), which are plentiful in fish oil, have been known for decades to be beneficial functional nutrients in different disease states. GPR120 is a G protein-coupled receptor for long-chain unsaturated fatty acids, including n-3 PUFAs, and was recently renamed free fatty acid receptor 4 (FFA4). Studies on FFA4-deficient mice and the development of specific pharmacological tools have started to unravel the functions of FFA4 associated with the actions of n-3 PUFAs in obesity, type 2 diabetes, and inflammation-related diseases. Here, the state of the art regarding the roles and functions of FFA4 and n-3 PUFA in macrophages are reviewed from the pharmacological perspective. In particular, the functions of n-3 PUFA on the anti-inflammatory M2 phenotypes of macrophages in different organs, such as, adipose tissues and liver, are discussed along with future research directions.
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