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Effect of biotin supplementation on fatty acid metabolic pathways in 3T3‐L1 adipocytes
Author(s) -
MorenoMéndez Ericka,
HernándezVázquez Alain,
FernándezMejía Cristina
Publication year - 2018
Publication title -
biofactors
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.204
H-Index - 94
eISSN - 1872-8081
pISSN - 0951-6433
DOI - 10.1002/biof.1480
Subject(s) - biotin , lipolysis , acetyl coa carboxylase , pyruvate carboxylase , carnitine , fatty acid , cd36 , fatty acid synthesis , biotin deficiency , beta oxidation , lipid metabolism , biochemistry , adipose tissue , chemistry , fatty acid metabolism , fatty acid synthase , triglyceride , endocrinology , metabolism , medicine , biology , enzyme , cholesterol , receptor
Abstract Several studies have shown that pharmacological concentrations of biotin decrease serum lipid concentrations and the expression of lipogenic genes. Previous studies on epididymal adipose tissue in mice revealed that 8 weeks of dietary biotin supplementation increased the protein abundance of the active form of AMPK and the inactive forms acetyl CoA carboxylase (ACC)‐1 and − 2, and decreased serum free fatty acid concentrations but did not affect lipolysis. These data suggest that pharmacological concentrations of the vitamin might affect fatty acid metabolism. In this work, we investigated the effects of pharmacological biotin concentrations on fatty acid synthesis, oxidation, and uptake in 3T3‐L1 adipocytes. Similar to observations in mice, biotin‐supplemented 3T3‐L1 adipose cells increased the protein abundance of active T172 ‐AMPK and inactive ACC‐1 and ‐2 forms. No changes were observed in the expression of the transcriptional factor PPARα and carnitine‐palmitoyltransferase‐1 (CPT‐1). Radiolabeled assays indicated a decrease in fatty acid synthesis; an increase in fatty acid oxidation and fatty acid incorporation rate into the lipid fraction between control cells and biotin‐supplemented cells. The data revealed an increase in the mRNA abundance of the fatty acid transport proteins Fatp1 and Acsl1 but not Cd36 or Fatp4 mRNA. Furthermore, the abundance of glycerol phosphate acyl transferase‐3 protein was increased. Triglyceride content was not affected. Lipid droplet numbers showed an increase and their areas were smaller in the biotin‐supplemented group. In conclusion, these data indicate that biotin supplementation causes a decrease in fatty acid synthesis and an increase in its oxidation and uptake. © 2018 BioFactors, 45(2):259–270, 2019