Abstract
Injection (sc) of beta-cyclodextrin (beta-C) increased the number and size of renal tubular cell tumors in inbred Wistar (W) rats treated with 1,000 ppm of N-ethyl-N-hydroxyethylnitrosamine (EHEN). The incidence of renal tumors at the end of the 32-week experiment was 50% in rats treated with 1,000 ppm EHEN for 2 weeks and 100% in rats treated with 1,000 ppm EHEN for 2 weeks and then given daily sc injections of beta-C for 1 week. The incidence of renal tumors more than 3 mm in diameter was 70% in rats treated with 1,000 ppm EHEN before beta-C but 0% in rats treated with EHEN alone. In addition, beta-C promoted the development of renal tumors in rats treated with 500 ppm EHEN, which is a subthreshold dose for renal tubular cell tumorigenesis. These results show that beta-C promotes EHEN-induced renal tubular cell tumorigenesis.
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