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Mob-1, a Ras target gene, is overexpressed in colorectal cancer
1The Vanderbilt Cancer Center, Department of Cell Biology, School of Medicine, Vanderbilt University, Nashville, Tennessee 37232-6838, USA.
Abstract:
Mutations in the ras oncogenes have been linked to many different cancers. In contrast to the extensive body of knowledge related to the genetics of ras activation, relatively little is known of the transcriptional events triggered by ras. In previous work we have used differential display to identify Mob-1, a member of alpha-chemokine family, as one of the immediate transcriptional targets following Ras activation. Here, we provide additional experimental evidence to support this finding by the use of an inducible H-ras expression system, the treatment of Ras farnesyl transferase inhibitor and activation of endogenous Ras by serum growth factors. We further demonstrate that IP-10, the human homolog of Mob-1, is overexpressed in the majority of colorectal cancers.
Insights
Ras oncogene mutations drive cancer. This study identifies Mob-1 (chemokine) as a key transcriptional target of Ras activation, with its human homolog, IP-10, overexpressed in colorectal cancers.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Ras oncogenes are frequently mutated in various cancers.
- The transcriptional consequences of Ras activation are not well understood.
- Previous studies identified Mob-1 as an immediate transcriptional target of Ras.
Purpose of the Study:
- To provide further experimental evidence for Mob-1 as a Ras transcriptional target.
- To investigate the role of IP-10, the human homolog of Mob-1, in colorectal cancer.
Main Methods:
- Utilized an inducible H-ras expression system.
- Administered Ras farnesyl transferase inhibitor.
- Activated endogenous Ras using serum growth factors.
- Assessed IP-10 expression in colorectal cancer samples.
Main Results:
- Confirmed Mob-1 as an immediate transcriptional target of Ras activation through multiple experimental approaches.
- Demonstrated that IP-10, the human homolog of Mob-1, is overexpressed in the majority of colorectal cancers.
Conclusions:
- Ras activation leads to the transcriptional upregulation of Mob-1/IP-10.
- IP-10 overexpression is a common event in colorectal cancer, suggesting its potential role in tumorigenesis.