| First Author | Tannehill-Gregg SH | Year | 2004 |
| Journal | Vet Pathol | Volume | 41 |
| Issue | 3 | Pages | 278-82 |
| PubMed ID | 15133179 | Mgi Jnum | J:90163 |
| Mgi Id | MGI:3042643 | Doi | 10.1354/vp.41-3-278 |
| Citation | Tannehill-Gregg SH, et al. (2004) The roles of smad2 and smad3 in the development of chemically induced skin tumors in mice. Vet Pathol 41(3):278-82 |
| abstractText | Transforming growth factor-beta (TGF-beta) plays a complex role in skin carcinogenesis, acting as a suppressor early in tumor development but later as a promoter. Smad proteins are important intracellular mediators of TGF-beta signaling. To determine the effect of disrupting Smad genes and TGF-beta signaling on chemically induced skin carcinogenesis in mice, transgenic mice heterozygous for Smad2 or Smad3 deletions and wild-type controls were treated with topical dimethylbenzanthracene for 7 months. Tumor multiplicity, type, and degree of differentiation were assessed by histopathology and immunohistochemistry. Smad3(+/-) mice developed significantly fewer tumors than the wild-type group (P < 0.05). This indicated a possible oncogenic function for Smad3 in skin carcinogenesis. Smad2(+/-) mice formed less-differentiated tumors than their wild-type counterparts, supporting a tumor suppressor role for Smad2. There was a significant difference (P < 0.05) in tumor type between Smad2(+/-) and Smad3(+/-) groups, suggesting that Smad2 and Smad3 may regulate different targets. |
