Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 20, Pages 8390-8395Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1101747108
Keywords
transcription regulator; antiangiogenesis
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Funding
- Research Grants Council
- University Grants Council of the Hong Kong Special Administrative Region, People's Republic of China [6615/07M, AoE/M-06/08]
- University of Hong Kong [200907176081]
- Swedish Cancer Society
- Swedish Research Council
- Swedish Institute
- Royal Swedish Academy of Sciences
- Karolinska Institute
- Grants-in-Aid for Scientific Research [23390017, 22791293, 23659658, 22659011] Funding Source: KAKEN
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Chromosome 14 was transferred into tumorigenic nasopharyngeal carcinoma and esophageal carcinoma cell lines by a microcell-mediated chromosome transfer approach. Functional complementation of defects present in the cancer cells suppressed tumor formation. A candidate tumor-suppressor gene, cysteine-rich intestinal protein 2 (CRIP2), located in the hot spot for chromosomal loss at 14q32.3, was identified as an important candidate gene capable of functionally suppressing tumor formation. Previous studies have shown that CRIP2 is associated with development. To date, no report has provided functional evidence supporting a role for CRIP2 in tumor development. The present study provides unequivocal evidence that CRIP2 can functionally suppress tumorigenesis. CRIP2 is significantly down-regulated in nasopharyngeal carcinoma cell lines and tumors. CRIP2 reexpression functionally suppresses in vivo tumorigenesis and angiogenesis; these effects are induced by its transcription-repressor capability. It interacts with the NF-kappa B/p65 to inhibit its DNA-binding ability to the promoter regions of the major proangiogenesis cytokines critical for tumor progression, including IL6, IL8, and VEGF. In conclusion, we provide compelling evidence that CRIP2 acts as a transcription repressor of the NF-kappa B-mediated proangiogenic cytokine expression and thus functionally inhibits tumor formation and angiogenesis.
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