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• W1576884145 abstract "Fetuin belongs to a group of fetal glycoproteins whose specific function is not known. In this study we investigated the effect of bovine fetuin on exogenous fatty acid incorporation into lipid classes by fetal rabbit aortic smooth muscle cells (SMC) and human fetal skin fibroblasts. When compared with albumin, the addition of fetuin to the culture medium caused a dramatic increase in labeled fatty acid incorporation (nanomoles/mg of protein) by SMC into triglycerides (albumin (control) 2.8 +/- 0.3 + fetuin 178.3 +/- 13.7). This effect was noted at a wide range of fetuin concentrations (0.2-5%) at oleate:fetuin molar ratios of 3.3-0.13, respectively. Similar effects were noted using human fetal skin fibroblasts with both labeled oleic and arachidonic acids (0.1 mM) as substrates (arachidonic acid incorporation into triglycerides, albumin (control) 76.9 +/- 16.2 + fetuin 684.6 +/- 64.1). Stimulation of fatty acid incorporation into di- and monoglycerides was also noted. Although the amount of unbound fatty acid in the presence of fetuin was greater than with albumin, experiments done under conditions that create identical unbound oleate levels (by varying fatty acid concentration) still showed increased fatty acid incorporation into triglycerides by SMC when exposed to fetuin. This marked effect of fetuin on triglyceride accumulation in cells was confirmed by lipid analysis, strong positive staining with oil red O, and transmission of electron microscopy. Furthermore, the potential physiological role of fetuin in terms of fatty acid and transport was attested by (a) the presence of significant amounts of free fatty acids associated with fetuin; and (b) by the stimulatory effect of fetuin, even when added to culture media containing other fatty acid carriers. These results show that (a) fetuin is far more efficient than albumin in incorporating fatty acids into cells; and (b) this might represent a novel function for fetuin during development." @default.
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• W1576884145 date "1990-04-01" @default.
• W1576884145 modified "2023-09-27" @default.
• W1576884145 title "Marked acceleration of exogenous fatty acid incorporation into cellular triglycerides by fetuin." @default.
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• W1576884145 doi "https://doi.org/10.1016/s0021-9258(19)39445-1" @default.
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