Transport of the investigational anti-cancer drug 5,6-dimethylxanthenone-4-acetic acid and its acyl glucuronide by human intestinal caco-2 cells

Zhou, S, Feng, X, Kestell, P, Baguley, B, Paxton, J and Chan, E 2005, 'Transport of the investigational anti-cancer drug 5,6-dimethylxanthenone-4-acetic acid and its acyl glucuronide by human intestinal caco-2 cells', European Journal of Pharmaceutical Sciences , vol. 25, no. 4, pp. 513-524.


Document type: Journal Article
Collection: Journal Articles

Title Transport of the investigational anti-cancer drug 5,6-dimethylxanthenone-4-acetic acid and its acyl glucuronide by human intestinal caco-2 cells
Author(s) Zhou, S
Feng, X
Kestell, P
Baguley, B
Paxton, J
Chan, E
Year 2005
Journal name European Journal of Pharmaceutical Sciences
Volume number 25
Issue number 4
Start page 513
End page 524
Total pages 12
Publisher Elsevier BV
Abstract 5,6-Dimethylxanthenone-4-acetic acid (DMXAA), a potent cytokine inducer, exhibited marked antitumor activity when given as multiple oral doses in mice. The aim of this study was to examine the transport of DMXAA and its acyl glucuronide (DMXAA-G) using the human Caco-2 cells. DMXAA was minimally metabolized by Caco-2 cells and both DMXAA and DMXAA-G were taken up to a minor extent by the cells. The permeability coefficient (Papp) values of DMXAA over 10-500 ?M were 4 × 10-5 cm/s to 4.3 × 10-5 cm/s for both apical (AP) to basolateral (BL) and BL-AP transport, while the Papp values for the BL to AP flux of DMXAA-G were significantly greater than those for the AP to BL flux, with R net values of 4.5-17.6 over 50-200 ?M. The BL to AP active efflux of DMXAA-G followed Michaelis-Menten kinetics, with a Km of 83.5 ± 5.5 ?M, and Vmax of 0.022 ± 0.001 nmol/min. The flux of DMXAA-G was energy and Na+-dependent and MK-571 significantly (P < 0.05) inhibited its BL to AP flux, with an estimated Ki of 130 ?M. These data indicate that the transport of DMXAA across Caco-2 monolayers was through a passive process, whereas the transport of DMXAA-G was mediated by MRP1/2.
Subject Basic Pharmacology
Copyright notice © 2005 Elsevier B.V. All rights reserved.
ISSN 0928-0987
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