Journal
ONCOLOGY REPORTS
Volume 36, Issue 1, Pages 231-238Publisher
SPANDIDOS PUBL LTD
DOI: 10.3892/or.2016.4808
Keywords
colorectal cancer; B7-H3; BRCC3; DNA damage repair
Categories
Funding
- National Natural Science Foundation of China [81372375, 81502758]
- Wuxi Administration of Science and Technology Project [CSE31N1509]
- Clinical Medical Science and Technology Project of Jiangsu Province [BL2014019]
- Science and Technology Foundation of Suzhou [SYS201417]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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5-Fluorouracil (5-Fu) is still recognized as the mainstay in colorectal cancer chemotherapy, but the response rate of 5-Fu in colorectal cancer is less than 50%. Our previous mRNA microarray data revealed that BRCC3, a component of the BRCA1-BRCA2-BRCC3 DNA repair complex, had a direct relationship with B7-H3, an immunoglobulin that is upregulated in tumor tissue and associated with metastasis and poor prognosis. Real-time PCR and western blot analysis confirmed that the expression of both BRCC3 mRNA and protein, respectively, were elevated following B7-H3 overexpression in SW480 cells; likewise, BRCC3 expression decreased after B7-H3 was knocked down in HCT-8 cells. DNA comet assay results indicate an inverse correlation between the extent of 5-Fu-induced DNA damage and the expression level of B7-H3 in both SW480- and HCT-8-based cell lines. In SW480 cells that overexpress B7-H3, knockdown of BRCC3 similarly permitted greater 5-Fu-induced DNA damage. Altogether, results suggest that BRCC3 may play a role in B7-H3-induced 5-Fu resistance, such that B7-H3 upregulates BRCC3 expression, enhancing DNA repair in colorectal cancer cells.
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