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B7 molecule mRNA expression in colorectal carcinoma
Ju-Xiang Xiao1, Pei-Song Bai, Bao-Chang Lai
1Department of Oncology, First Hospital of Xi'an Jiaotong University, Xi'an 710061, Shaanxi Province, China. xiao_juxiang@yahoo.com
World Journal of Gastroenterology
|October 21, 2005
Summary
Tumor-infiltrating B7 family molecules (B7-1, B7H1, B7H2, ICOS) mRNA were found in colorectal cancer cells and lymphocytes. Tumor cells showed higher expression than tumor-infiltrating lymphocytes.
Area of Science:
- Immunology
- Oncology
- Molecular Biology
Background:
- B7 family molecules are crucial co-stimulatory signals in immune responses.
- Understanding B7 molecule expression in colorectal cancer is vital for immunotherapy strategies.
Purpose of the Study:
- To investigate the mRNA expression of tumor-associated B7 molecules (B7-1, B7H1, B7H2, ICOS) in human colorectal cancer.
- To analyze the localization and levels of these molecules in tumor cells and tumor-infiltrating lymphocytes (TIL).
Main Methods:
- In situ hybridization (ISH) was employed to detect mRNA expression.
- Digoxin-labeled oligonucleotide probes were used for specific molecule detection.
- 22 human colorectal cancer tissue specimens were analyzed.
Main Results:
- B7-1, B7H1, B7H2, and ICOS mRNA were detected in both cancer cells and TILs.
- mRNA expression levels were significantly higher in tumor cells compared to TILs (P<0.001).
- No correlation was found between B7 molecule expression and patient demographics or clinicopathological features.
Conclusions:
- The predominant Th2 cytokine in the tumor microenvironment may influence B7H1 and B7H2 co-signal molecule expression in tumor cells and TILs.
- These findings highlight the complex interplay of B7 molecules within the colorectal cancer immune microenvironment.