TGFB1 and metabolic dysfunction-associated steatotic liver disease: A reduction in the release of transforming growth factor-beta 1 (TGF-β1) induces the suppression of hepatic stellate cells, and ultimately of fibrogenesis caused by NAFLD due to the ability of RA to inhibit proto-oncogene tyrosine-protein kinase MER (MERTK) in Kupffer cells.