Abstract:
:The transport behavior and absorption mechanism of Ala-His-Leu-Leu (AHLL) intestinal absorption in Caco-2 cell monolayers were clarified systemically. The safe absorptive concentration of AHLL was 200 μg/mL, which was determined by the 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide assay. The permeation of AHLL was concentration dependent in a bidirectional transfer and reached a plateau at 90 min. The efflux ratio was above 0.5, suggesting that AHLL was absorbed by both active transport and passive diffusion. The apparent permeability coefficients (Papp) of AHLL both from the apical (AP) to basolateral (BL) side (PappAB) and from the BL to AP side (PappBA) decreased when the temperature was lowered from 37°C to 4°C.The uptake of AHLL was more at pH 7.4 than at other pHs. Both verapamil and (E)-3-[[[3-[2-(7-chloro-2- quinolinyl) ethenyl] phenyl]-[[(3-dimethyl amino)-3-oxopropyl]thio] methyl] thio]-propanoic acid (MK571) inhibited the absorption of AHLL, indicating that P-glycoprotein and multi-drug resistant proteins (MRPs) were all involved in AHLL secretion, especially multi-drug resistant protein 2 (MRP2). AHLL was transported through both trans- and paracellular pathways across the Caco-2 cell monolayer. This work first elucidates the AHLL absorption mechanism in Caco-2 cells and provides the basis for future studies on the improvement of bioavailability.
journal_name
J Med Foodjournal_title
Journal of medicinal foodauthors
Li Y,Zhao J,Liu X,Xia X,Wang Y,Zhou Jdoi
10.1089/jmf.2016.3842subject
Has Abstractpub_date
2017-03-01 00:00:00pages
243-250issue
3eissn
1096-620Xissn
1557-7600journal_volume
20pub_type
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