Identification of an organic anion transport system in the human colon carcinoma cell line HT29 clone 19A
Identification of an organic anion transport system in the human colon carcinoma cell line HT29 clone 19A
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人结肠癌细胞系HT29克隆19A中有机阴离子转运系统的鉴定
DOI:
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发表时间:
2000
期刊:
影响因子:
--
通讯作者:
G. Rechkemmer
中科院分区:
文献类型:
--
作者:
S. Abrahamse;G. Rechkemmer
Abstract. The human colon carcinoma cell line HT29 cl.19A was studied for organic anion transporter activity by determining intracellular fluo-3 and fura-red accumulation and by measuring fluo-3 efflux. Modulators of organic anion transport systems were used to identify the transporters that are involved in dye extrusion. Addition of probenecid to the dye-loading medium, containing 10 µM fluo-3/AM and fura-red/AM, resulted in a dose-dependent increase in fluo-3 and fura-red accumulation in the cells. The increase in fluo-3 accumulation in the cells in the presence of probenecid was explained by the inhibitory effect of this compound on fluo-3 efflux. Fluo-3 efflux from the cells was also inhibited by sulfinpyrazone, another inhibitor of organic anion transport. Substrates of renal probenecid-sensitive organic anion exchange mechanisms as well as modulators of multidrug resistance associated protein (MRP) activity did not influence fluo-3 extrusion rates. However, reducing intracellular ATP contents completely blocked fluo-3 extrusion. Moreover, MK571, an inhibitor of MRP, significantly stimulated dye accumulation, whereas inhibitors of the multidrug resistance gene (MDR1) product P-glycoprotein, cyclosporin A and verapamil, did not. As probenecid inhibits fluo-3 efflux across the apical membrane of cells grown on permeable supports, we conclude that a probenecid-sensitive organic anion transporter is present in the apical membrane of HT29 cl.19A cells. This organic anion transport system differs from MDR1 and MRP2.
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影响因子:
21.1
作者:
J. M. Ford;W. Hait
通讯作者:
J. M. Ford;W. Hait
影响因子:
11.2
作者:
G. Jedlitschky;I. Leier;U. Buchholz;M. Center;D. Keppler
通讯作者:
G. Jedlitschky;I. Leier;U. Buchholz;M. Center;D. Keppler
影响因子:
9.3
作者:
J. Richie;L. Skowroński;P. Abraham;Y. Leutzinger
通讯作者:
J. Richie;L. Skowroński;P. Abraham;Y. Leutzinger
影响因子:
--
作者:
DiVirgilio,F;Steinberg,TH;Silverstein,SC
通讯作者:
Silverstein,SC