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Emerging roles of DMP1 in lung cancer
Kazushi Inoue1, Takayuki Sugiyama, Pankaj Taneja
1Departments of Pathology and Cancer Biology, Wake Forest University Health Sciences, Medical Center Boulevard, Winston-Salem, North Carolina, USA. kinoue@wfubmc.edu
Abstract:
The Ras-activated transcription factor DMP1 can stimulate Arf transcription to promote p53-dependent cell arrest. One recent study deepens the pathophysiologic significance of this pathway in cancer, first, by identifying DMP1 losses in human lung cancers that lack ARF/p53 mutations, and second, by demonstrating that Dmp1 deletions in the mouse are sufficient to promote K-ras-induced lung tumorigenesis via mechanisms consistent with a disruption of Arf/p53 suppressor function. These findings prompt further investigations of the prognostic value of DMP1 alterations in human cancers and the oncogenic events that can cooperate with DMP1 inactivation to drive tumorigenesis.
Insights
Loss of the DMP1 gene, a transcription factor, promotes lung cancer by disrupting the Arf/p53 tumor suppressor pathway. This suggests DMP1 alterations may have prognostic value in human cancers.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- The transcription factor DMP1 activates Arf, which promotes p53-dependent cell cycle arrest.
- Loss of tumor suppressor function is a key mechanism in cancer development.
Purpose of the Study:
- To investigate the role of DMP1 in lung cancer development and its association with the Arf/p53 pathway.
- To explore the pathophysiologic significance of DMP1 in human lung cancers.
Main Methods:
- Identification of DMP1 loss in human lung cancer samples.
- Analysis of Dmp1 gene deletion in mouse models of K-ras-induced lung tumorigenesis.
Main Results:
- DMP1 loss was identified in human lung cancers lacking ARF/p53 mutations.
- Dmp1 deletion in mice promoted K-ras-induced lung tumorigenesis.
- These effects were consistent with a disruption of Arf/p53 suppressor function.
Conclusions:
- DMP1 alterations are significant in lung cancer pathogenesis.
- DMP1 inactivation cooperates with oncogenic events like K-ras.
- Further research into DMP1's prognostic value and cooperative oncogenic events is warranted.
