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pubmed-article:19179402pubmed:abstractTextR-Spondin1 (RSpo1) is a novel secreted protein that augments canonical Wnt/beta-catenin signaling. We injected recombinant RSpo1 protein into transgenic Wnt reporter TOPGAL mice and have identified the oral mucosa as a target tissue for RSpo1. Administration of RSpo1 into normal mice triggered nuclear translocation of beta-catenin and resulted in increased basal layer cellularity, thickened mucosa, and elevated epithelial cell proliferation in tongue. We herein evaluated the therapeutic potential of RSpo1 in treating chemotherapy or radiotherapy-induced oral mucositis in several mouse models. Prophylactic treatment with RSpo1 dose-dependently overcame the reduction of basal layer epithelial cellularity, mucosal thickness, and epithelial cell proliferation in tongues of mice exposed to whole-body irradiation. RSpo1 administration also substantially alleviated tongue mucositis in the oral cavity of mice receiving concomitant 5-fluorouracil and x-ray radiation. Furthermore, RSpo1 significantly reduced the extent of tongue ulceration in mice receiving a single fraction, high dose head-only radiation in a dose-dependent manner. Moreover, combined therapy of RSpo1 and keratinocyte growth factor resulted in complete healing of tongue ulcers in mice subjected to snout-only irradiation. In conclusion, our results demonstrate RSpo1 to be a potent therapeutic agent for oral mucositis by enhancing basal layer epithelial regeneration and accelerating mucosal repair through up-regulation of Wnt/beta-catenin pathway.lld:pubmed
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pubmed-article:19179402pubmed:authorpubmed-author:ZhaoJingsongJlld:pubmed
pubmed-article:19179402pubmed:authorpubmed-author:KimKyung-AhKAlld:pubmed
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pubmed-article:19179402pubmed:dateRevised2009-11-18lld:pubmed
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pubmed-article:19179402pubmed:articleTitleR-Spondin1 protects mice from chemotherapy or radiation-induced oral mucositis through the canonical Wnt/beta-catenin pathway.lld:pubmed
pubmed-article:19179402pubmed:affiliationDepartment of Research, Nuvelo, Inc., 201 Industrial Road, Suite 310, San Carlos, CA 94070, USA. jingsongzhao@yahoo.comlld:pubmed
pubmed-article:19179402pubmed:publicationTypeJournal Articlelld:pubmed
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