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Shimotoda, Japan

Oda K.,Tanabe R and D Co. | Hosoda N.,Tanabe R and D Co. | Endo H.,Tanabe R and D Co. | Saito K.,Tanabe R and D Co. | And 8 more authors.
Cancer Science | Year: 2010

Most tumor cell membranes overexpress l-type amino acid transporter 1, while normal cell membranes contain l-type amino acid transporter 2; both are Na+-independent amino acid transporters. Therefore, compounds that selectively inhibit l-type amino acid transporter 1 offer researchers with a novel cancer molecular target. Synthetic chemistry efforts and in vitro screening have produced a variety of novel compounds possessing high in vitrol-type amino acid transporter 1 selectivity; KYT-0353 was one such compound. The present studies illustrate that KYT-0353 inhibited 14C-leucine uptake and cell growth in human colon cancer-derived HT-29 cells; IC50s were 0.06 μ. m and 4.1 μ. m, respectively. KYT-0353 also inhibited 14C-leucine uptake in mouse renal proximal tubule cells expressing l-type amino acid transporter 1, and inhibited cell growth; IC50s were 0.14 μ. m and 16.4 μ. m, respectively. Compared to control animals, intravenously administered KYT-0353 (12.5 mg/kg and 25.0 mg/kg) showed statistically significant growth inhibition against HT-29 tumors transplanted to nude mice with maximal inhibition ratios of 65.9% and 77.2%, respectively. Body weight increase with time - a safety indicator - was slightly depressed at 12.5 mg/kg and 25.0 mg/kg with maximal ratios of 3.7% (day 2) and 6.3% (day 11), respectively. Thus, KYT-0353 showed significant growth inhibitory effects on HT-29 cells both in vitro and in vivo, whereas it only caused a slight body weight depression. Therefore, KYT-0353 appears to have potential as a novel anti-tumor agent, presumably via selective in vivol-type amino acid transporter 1 inhibition. © 2009 Japanese Cancer Association.

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