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- W2017123346 abstract "Loss of the adenomatous polyposis coli (APC) tumor suppressor gene plays a significant role in colorectal carcinogenesis. One function of the APC gene product is to regulate beta-catenin, a protein that plays a role in cell adhesion and also regulates the activity of certain transcription factors. To more precisely delineate the role of beta-catenin signaling in colon cancer growth, we treated mice bearing APC-mutant SW480 colon cancer xenografts with antisense oligonucleotides (ODNs) directed against beta-catenin mRNA and examined effects on beta-catenin expression and tumor growth.Balb/C nude mice underwent subcutaneous injection of 1 x 10(6) SW480 cells to establish tumor xenografts. In one experiment, tumors were allowed to grow for 7 days, after which time animals were randomized to undergo daily intraperitoneal injections of either antisense beta-catenin ODN at doses of 5, 10, or 20 mg/kg, scrambled sequence beta-catenin ODN control, or saline control for 7 days. Tumors were excised and homogenized, and tumor lysates subjected to gel electrophoresis and Western blotting for beta-catenin protein quantification. In a second experiment, tumor-bearing animals began receiving daily intraperitoneal injections of either antisense beta-catenin ODN at doses of 5, 10, or 20 mg/kg, scrambled sequence beta-catenin ODN control, or saline control. Tumor growth was quantitated by measuring tumor volumes twice weekly. A third experiment evaluated the antitumor effects of daily bolus dosing versus continuous infusion of beta-catenin antisense ODNs (20 mg/kg).Treatment of APC-mutant colorectal carcinoma xenografts with beta-catenin antisense resulted in a dose-dependent down-regulation in beta-catenin protein expression as shown by Western blotting. Treatment of tumor-bearing mice with antisense directed at beta-catenin also demonstrated a dose-dependent inhibition of tumor growth. There appears to be little difference in the antitumor effects of antisense ODNs administered by continuous infusion or bolus dosing schedules.beta-Catenin expression plays a critical role in the tumorigenic growth of APC-mutant colon cancer xenografts. Strategies targeting beta-catenin, including the use of antisense ODNs, may be of use in the treatment of human colon cancer." @default.
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- W2017123346 date "2001-11-01" @default.
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- W2017123346 title "β-Catenin Antisense Treatment Decreases β-Catenin Expression and Tumor Growth Rate in Colon Carcinoma Xenografts" @default.
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- W2017123346 doi "https://doi.org/10.1006/jsre.2001.6241" @default.
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