title: Fatty acids affect micellar properties and modulate vitamin D uptake and basolateral efflux in Caco-2 cells.
abstract: We have recently shown that vitamin D3 (cholecalciferol) absorption is not a simple passive diffusion but involves cholesterol transporters. As free fatty acids (FAs) modulate cholesterol intestinal absorption and metabolism, we hypothesized that FAs may also interact with vitamin D absorption. Effects of FAs were evaluated at different levels of cholecalciferol intestinal absorption. First, the physicochemical properties of micelles formed with different FAs were analyzed. The micelles were then administered to human Caco-2 cells in culture to evaluate FA effects on (i) cholecalciferol uptake and basolateral efflux and (ii) the regulation of genes coding proteins involved in lipid absorption process. Micellar electric charge was correlated with both FA chain length and degree of unsaturation. Long-chain FAs at 500 μM in mixed micelles decreased cholecalciferol uptake in Caco-2 cells. This decrease was annihilated as soon as the long-chain FAs were mixed with other FAs. Oleic acid significantly improved cholecalciferol basolateral efflux compared to other FAs. These results were partly explained by a modulation of genes coding for lipid transport proteins such as Niemann-pick C1-like 1 and scavenger receptor class B type I. The data reported here show for the first time that FAs can interact with cholecalciferol intestinal absorption at different key steps of the absorption process. Cholecalciferol intestinal absorption may thus be optimized according to oil FA composition.
authors.affiliation: INRA, UMR 1260 "Nutrition, Obesity and Risk of Thrombosis", F-13385 Marseille, France; INSERM, UMR U1062, F-13385 Marseille, France; Aix-Marseille University, F-13385 Marseille, France; Lesieur, Asnières-sur-Seine, France.
authors.forename: Aurélie
authors.initials: A
authors.lastname: Goncalves
authors.forename: Béatrice
authors.initials: B
authors.lastname: Gleize
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Roi
authors.forename: Marion
authors.initials: M
authors.lastname: Nowicki
authors.forename: Amélie
authors.initials: A
authors.lastname: Dhaussy
authors.forename: Alain
authors.initials: A
authors.lastname: Huertas
authors.forename: Marie-Josèphe
authors.initials: MJ
authors.lastname: Amiot
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Reboul
mesh_terms: D018938:Caco-2 Cells; D002762:Cholecalciferol / Q000378:metabolism*; D005231:Fatty Acids, Unsaturated / Q000494:pharmacology*; D006801:Humans; D007408:Intestinal Absorption / Q000187:drug effects / Q000502:physiology*; D008565:Membrane Proteins / Q000378:metabolism; D026901:Membrane Transport Proteins; D008823:Micelles; D019301:Oleic Acid / Q000494:pharmacology; D051122:Scavenger Receptors, Class B / Q000378:metabolism
chemical_list: D005231:Fatty Acids, Unsaturated; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D008823:Micelles; C410800:NPC1L1 protein, human; C495124:SCARB1 protein, human; D051122:Scavenger Receptors, Class B; D002762:Cholecalciferol; D019301:Oleic Acid
keywords: ABCA1; ALA; ARA; ATP binding cassette A1; Bioavailability; CD36; Caco-2 TC-7 cells; Cholecalciferol; DHA; DMEM; Dulbecco's modified Eagle's medium; EPA; FA; FBS; FED; Fatty acids; Intestinal absorption; LA; MUFA; Mixed micelles; NPC1L1; Niemann-pick C1-like 1; OA; PA; PBS; PUFA; SR-BI; arachidonic acid; cluster determinant 36; docosahexaenoic acid; eicosapentaenoic acid; fatty acid; fetal bovine serum; fish oil enriched in DHA; linoleic acid; monounsaturated FA; oleic acid; palmitic acid; phosphate-buffered saline; polyunsaturated FA; scavenger receptor class B type I; α-linolenic acid