抑癌基因WWOX在肝外胆管癌中的表达

Significance of KLF6 and WWOX protein expression in colorectal carcinoma

AIM: To investigate the expression of Kruppel-like factor 6 (KLF6) and WW domain-containing oxidoreductase (WWOX) proteins in colorectal carcinoma and to analyze their clinicopathological significance.

METHODS: The expression of KLF6 and WWOX proteins was detected by immunohistochemistry in 40 colorectal carcinoma specimens and 40 normal colorectal mucosa specimens.

RESULTS: The positive rates of KLF6 and WWOX protein expression differed significantly between colorectal carcinoma and normal colorectal mucosa (KLF6: 45.0% vs 82.5%, WWOX: 37.5% vs 90.0%, both P < 0.05). The expression of KLF6 and WWOX proteins was found to be associated with tumor differentiation, lymph node metastasis, and tumor invasion in colorectal carcinoma (all P < 0.05). A positive correlation was noted between the expression of KLF6 and that of WWOX in colorectal carcinoma (r = 0. 320, P < 0.05).

CONCLUSION: Reduced expression of KLF6 and WWOX proteins may be related with the development, progression, and prognosis of colorectal carcinoma. Combined detection of KLF6 and WWOX protein expression is helpful for diagnosis and evaluation of the prognosis of colorectal carcinoma.

WWOX gene transfection inhibits proliferation, accelerates apoptosis, and reduces invasion in human cholangiocarcinoma cell line QBC939

AIM: To investigate the effect of transfection with the WW domain-containing oxidoreductase (WWOX) gene on cell proliferation, apoptosis and invasion in human cholangiocarcinoma cell line QBC939.

METHODS: A recombinant eukaryotic expression plasmid containing the WWOX gene was introduced into QBC939 cells by liposome-mediated transfection. The mRNA and protein expression of WWOX in QBC939 cells stably transfected with the recombinant plasmid was detected by quantitative RT-PCR and Western blotting, respectively. Cell proliferation was tested by methyl thiazolyl tetrazolium (MTT) assay. Cell apoptosis was assessed by flow cytometry (FCM). Cell invasion was determined by Transwell chamber assay.

RESULTS: QBC939 cells stably transfected with the recombinant plasmid were successfully generated. The expression of WWOX mRNA and protein was markedly increased in QBC939 cells transfected with the recombinant plasmid when compared with untransfected QBC939 cells and those transfected with control plasmid [3.71(3.64-3.78) vs 1.00(0.98-1.02), 1.07(1.02-1.13); 0.86 ± 0.03 vs 0.25 ± 0.01, 0.27 ± 0.02, all P < 0.05]. WWOX gene transfection significantly decreased cell proliferation [0.63 ± 0.04 vs 0.90 ± 0.05, 0.87 ± 0.04, both P < 0.01] but promoted apoptosis (21.40% ± 2.35% vs 1.24% ± 0.35%, 1.73% ± 0.48%, both P < 0.01). Transwell chamber assay showed that the number of transfected cells that passed the Transwell membrane was significantly less than those of control cells (70.00 ± 4.58 vs 102.33 ± 8.33, 107.00 ± 9.00, both P < 0.01).

CONCLUSION: WWOX expression inhibits proliferation, accelerates apoptosis, and reduces invasion in human cholangiocarcinoma cell line QBC939, suggesting that the WWOX gene may be a novel target for gene therapy of cholangiocarcinoma.