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(American Journal of Pathology. 2002;160:1057-1068.)
© 2002 American Society for Investigative Pathology

Regular Articles

Mice Lacking Smad3 Are Protected Against Cutaneous Injury Induced by Ionizing Radiation

Kathleen C. Flanders*, Catherine D. Sullivan*, Makiko Fujii*, Anastasia Sowers{dagger}, Mario A. Anzano*, Alidad Arabshahi*, Christopher Major*, Chuxia Deng{ddagger}, Angelo Russo{dagger}, James B. Mitchell{dagger} and Anita B. Roberts*

From the Laboratory of Cell Regulation andCarcinogenesis*
and Radiation BiologyBranch,{dagger}
National Cancer Institute and theGenetics of Development and Disease Branch,{ddagger}
National Institute of Diabetes and Digestive and Kidney Diseases,National Institutes of Health, Bethesda, Maryland

Transforming growth factor-ß (TGF-ß) plays a central role in the pathogenesis of inflammatory and fibrotic diseases, including radiation-induced fibrosis. We previously reported that mice null for Smad3, a key downstream mediator of TGF-ß, show accelerated healing of cutaneous incisional wounds with reduced inflammation and accumulation of matrix. To determine if loss of Smad3 decreases radiation-induced injury, skin of Smad3+/+ [wild-type (WT)] and -/- [knockout (KO)] mice was exposed to a single dose of 30 to 50 Gy of {gamma}-irradiation. Six weeks later, skin from KO mice showed significantly less epidermal acanthosis and dermal influx of mast cells, macrophages, and neutrophils than skin from WT littermates. Skin from irradiated KO mice exhibited less immunoreactive TGF-ß and fewer myofibroblasts, suggesting that these mice will have a significantly reduced fibrotic response. Although irradiation induced no change in the immunohistochemical expression of the TGF-ß type I receptor, the epidermal expression of the type II receptor was lost after irradiation whereas its dermal expression remained high. Primary keratinocytes and dermal fibroblasts prepared from WT and KO mice showed similar survival when irradiated, as did mice exposed to whole-body irradiation. These results suggest that inhibition of Smad3 might decrease tissue damage and reduce fibrosis after exposure to ionizing irradiation.




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