Id1 deficiency protects against tumor formation in ApcMin/+ mice but not in a mouse model of colitis-associated colon cancer Journal Article

Authors: Zhang, N.; Subbaramaiah, K.; Yantiss, R. K.; Zhou, X. K.; Chin, Y.; Benezra, R.; Dannenberg, A. J.
Article Title: Id1 deficiency protects against tumor formation in ApcMin/+ mice but not in a mouse model of colitis-associated colon cancer
Abstract: Different mechanisms contribute to the development of sporadic, hereditary and colitis-associated colorectal cancer. Inhibitor of DNA binding/differentiation (Id) proteins act as dominantnegative antagonists of basic helix-loop-helix transcription factors. Id1 is a promising target for cancer therapy, but little is known about its role in the development of colon cancer.We used immunohistochemistry to demonstrate that Id1 is overexpressed in human colorectal adenomas and carcinomas, whether sporadic or syndromic. Furthermore, elevated Id1 levels were found in dysplasia and colon cancer arising in patients with inflammatory bowel disease. Because levels of PGE2 are also elevated in both colitis and colorectal neoplasia, we determined whether PGE2 could induce Id1. PGE2 via EP4 stimulated protein kinase A activity resulting in enhanced pCREB-mediated Id1 transcription in human colonocytes. To determine the role of Id1 in carcinogenesis, two mouse models were used. Consistent with the findings in humans, Id1 was overexpressed in tumors arising in both ApcMin/+ mice, a model of familial adenomatous polyposis, and in experimental colitis-associated colorectal neoplasia. Id1 deficiency led to significant decrease in the number of intestinal tumors in ApcMin/+ mice and prolonged survival. In contrast, Id1 deficiency did not affect the number or size of tumors in the model of colitisassociated colorectal neoplasia, likely due to exacerbation of colitis associated with Id1 loss. Collectively, these results suggest that Id1 plays a role in gastrointestinal carcinogenesis. Our findings also highlight the need for different strategies to reduce the risk of colitisassociated colorectal cancer compared with sporadic or hereditary colorectal cancer. Cancer Prev Res; 8(4); 303-11. © 2015 AACR.
Journal Title: Cancer Prevention Research
Volume: 8
Issue: 4
ISSN: 1940-6207
Publisher: American Association for Cancer Research  
Date Published: 2015-04-01
Start Page: 303
End Page: 311
Language: English
DOI: 10.1158/1940-6207.capr-14-0411
PROVIDER: scopus
PUBMED: 25623217
PMCID: PMC4832599
Notes: Export Date: 4 May 2015 -- Source: Scopus
Citation Impact
MSK Authors
  1. Robert Benezra
    144 Benezra
  2. Yvette Chin
    12 Chin
  3. Ning Zhang
    3 Zhang