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- Title
Organic anion transporting polypeptide-C mediates arsenic uptake in HEK-293 cells.
- Authors
Wen-Jen Lu; Tamai, Ikumi; Jun-ichi Nezu; Ming-Liang Lai; Jin-ding Huang
- Abstract
Arsenic is an established human carcinogen. The role of aquaglyroporins (AQPs) in arsenic disposition was recently identified. In order to examine whether organic anion transporting polypeptide-C (OATP-C) also plays a role in arsenic transport, OATP-C cDNA was transfected into cells of a human embryonic kidney cell line (HEK-293). Transfection increased uptake of the model OATP-C substrate, estradiol-17β- D-glucuronide, by 10-fold. In addition, we measured uptake and cytotoxicity of arsenate, arsenite, monomethylarsonate(MMAV), and dimethylarsinate (DMAV). Transfection of OATP-C increased uptake and cytotoxicity of arsenate and arsenite, but not of MMAV or DMAV. Rifampin and taurocholic acid (a substrate of OATP-C) reversed the increased toxicity of arsenate and arsenite seen in OATP-C-transfected cells. The increase in uptake of inorganic arsenic was not as great as that of estradiol-17β- D-glucuronide. Our results suggest that OATP-C can transport inorganic arsenic in a (GSH)-dependent manner. However, this may not be the major pathway for arsenic transport.
- Subjects
ARSENIC; CARCINOGENS; ANIONS; CELL lines; CELL-mediated cytotoxicity
- Publication
Journal of Biomedical Science, 2006, Vol 13, Issue 4, p525
- ISSN
1021-7770
- Publication type
Article
- DOI
10.1007/s11373-006-9071-0