Peer-Reviewed Journal Details
Mandatory Fields
O'Sullivan, L,Aherne, SA,O'Brien, NM;
2009
September
International Journal For Vitamin and Nutrition Research
Investigation of beta-carotene and Lutein Transport in Caco-2 Cells: Carotenoid-carotenoid Interactions and Transport Inhibition by Ezetimibe
Validated
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Optional Fields
Bioavailability beta-carotene carotenoid interactions Caco-2 cells ezetimibe lutein transport INTESTINAL CHOLESTEROL ABSORPTION B TYPE-I XANTHOPHYLL CAROTENOIDS GREEN VEGETABLES SR-BI NPC1L1 SECRETION LYCOPENE NIEMANN-PICK-C1-LIKE-1 BIOAVAILABILITY
79
337
347
Carotenoid bioavailability is influenced by a number of factors including the presence of other carotenoids, which may enhance or inhibit the transport of one another by intestinal cells. Therefore, the objectives of the present study were: first, to determine carotenoid uptake and secretion (i.e. transport) by supplementing differentiated Caco-2 cells with increasing concentrations of either lutein or beta-carotene (0-1 mu M.); second, to assess any interactions between beta-carotene and lutein on their cellular uptake and secretion; and third, to a minor extent, to determine the effects of a carotenoid absorption inhibitor, ezetimibe, on beta-carotene and lutein transport. The carotenoid mixes were used at molar ratios of 1:1 and 4:1. At equimolar concentrations, lutein had a negative impact on beta-carotene transport and vice versa. However, these effects were not seen when the ratios were adjusted to 4:1. Following treatment with ezetimibe (25-100 mu M) for 16 hours there was a reduction in beta-carotene transport, whereas a non-significant reduction in lutein transport was observed. In conclusion, this study confirmed that beta-carotene and lutein interact during their absorption, depending on the concentration/ratios used, and that carotenoid absorption is partially affected by ezetimibe.
DOI 10.1024/0300-9831.79.5.337
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