Bmi-1和Mel-18基因在大肠癌组织中的表达及意义

Correlation between CBX8 protein and tumors

Chromobox protein homolog 8 (CBX8), the core component of the polycomb group (PcG) protein family PRC1 complex, plays an important role in cell proliferation, senescence, maintenance of stem cell self-renewal and/or relapse, and the occurrence of tumors. Recently, CBX8 was found to be overexpressed in a variety of malignant tumors and closely related to the progression and prognosis of tumors. This paper reviews the current progress in research of CBX8 in tumors.

Significance of β-catenin and vitamin D receptor expression in colorectal carcinoma

AIM: To investigate the expression of β-catenin and vitamin D receptor (VDR) in colorectal carcinoma to explore their roles in colorectal carcinoma pathogenesis.

METHODS: The expression of β-catenin and VDR was detected by immunohistochemistry in 65 colorectal carcinoma specimens and 65 normal colorectal mucosa specimens.

RESULTS: The missing expression of β-catenin on the cell membrane and ectopic expression in colorectal carcinoma specimens and normal colorectal mucosa specimens had a significant difference (P < 0.01). The strongly positive expression of VDR in colorectal carcinoma specimens and normal colorectal mucosa specimens had a significant difference (P < 0.01). The abnormal expression of β-catenin was positively correlated with that of VDR in colorectal carcinoma (r = 0.98, P < 0.01), and both were found to be associated with lymph node metastasis and tumor invasion.

CONCLUSION: Lower expression of VDR may influence β-catenin and activate the Wnt signaling pathway in human colorectal carcinoma. Detecting the abnormal expression of β-catenin and VDR may be helpful for the diagnosis and evaluation of the prognosis of colorectal carcinoma.

Clinical significance of expression of Bmi-1 and Mina53 in colorectal carcinoma

AIM: To investigate the clinicopathological significance of expression of B-cell-specific moloney murine leukemia virus insertion site 1 (Bmi-1) and myc-induced nuclear antigen with a molecular mass of 53 kDa (Mina53) in colorectal carcinoma.

METHODS: The expression of Bmi-1 and Mina53 proteins was detected by immunohistochemistry in 56 colorectal cancer samples and matched tumor-adjacent normal tissue samples. The correlation between the expression of these proteins and the clinicopathologic features of colorectal carcinoma was analyzed.

RESULTS: The positive rates of Bmi-1 expression and Mina53 in colorectal cancer were significantly higher than those in matched tumor-adjacent normal tissue (80.4% vs 35.7%, 73.2% vs 19.6%, χ² = 22.913, 32.308, P < 0.05 for both). Expression of Bmi-1 and Mina53 was significantly associated with tumor differentiation, lymph node metastasis and tumor infiltration depth in colorectal carcinoma (P < 0.05 for all), but not with age or gender (P > 0.05 for both). A positive correlation was noted between the expression of Bmi-1 and that of Mina53 in colorectal carcinoma (r = 0.296, P < 0.05).

CONCLUSION: High expression of Bmi-1 and Mina53 proteins may participate in the occurrence, progression and prognosis of colorectal carcinoma. Combined detection of the expression of these proteins is helpful to the diagnosis and evaluation of the prognosis of colorectal carcinoma.