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Promising new drug treats and protects against radiotherapy-associated oral mucositis
Date:3/12/2013

Mouse model studies show that administered genetically or topically, protein Smad7 protects against or heals mouth sores commonly associated with cancer treatment.

In some cancer patients treated with radiation, the mouth sores known as oral mucositis become so severe that feeding tubes are required for nutrition and narcotics are needed for pain. In fact, 40-70 percent of patients treated with upper-body radiation develop the condition to some degree. Currently, there is no FDA approved treatment. A University of Colorado Cancer Center study published this week in the journal Nature Medicine takes an important step toward changing that.

"We developed a genetically engineered mouse that produces a protein called Smad7 in the surface layers of its mouth. With this protein expressed, mouse models were dramatically more resistant to the development of oral mucositis than were controls," says Xiao-Jing Wang, PhD, CU Cancer Center investigator and John S. Gates endowed Chair of Cancer Stem Cell Biology at the Charles C. Gates Center for Regenerative Medicine and Stem Cell Biology.

Wang and collaborators including Qinghong Zhang, PhD, Yosef Refaeli, PhD, and radiation oncologist David Raben, MD, are pursuing further research with the goal of developing Smad7 as a therapeutic agent for human oral mucositis. For example, the group joined Smad7 in with a short peptide that allows the protein to cross through cell membranes, and produced this combination protein from cultured bacteria. When they applied the engineered compound directly to the mouse oral cavity, it both protected against the development of oral mucositis and worked to heal existing ulcers. Importantly, it revived wounded normal cells but not cancer cells, avoiding a major problem of growth factors currently used to promote the cell growth that heals ulcers.

"It's very reasonable to hope that this line of research will result in a drug that patients can self-admin
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Contact: Garth Sundem
garth.sundem@ucdenver.edu
University of Colorado Denver
Source:Eurekalert

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