Wei Wang1, He-Sheng Luo, Bao-Ping Yu. 1. Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, China.
Abstract
AIM: To investigate the expression of NF-kappaBp65 protein and human telomerase reverse transcriptase (hTERT) and their correlation in gastric cancer and precancerous lesions. METHODS: Forty-one patients with primary gastric cancer, 15 with dysplasia, 23 intestinal metaplasia and 10 with normal gastric mucosa were included in this study. Expression of NF-kappaBp65 protein, hTERT mRNA and protein were determined by immunohistochemistry and in situ hybridization. RESULTS: The rate of p65 expression in normal gastric mucosa, intestinal metaplasia, dysplasia and carcinoma was 0%, 34.78%, 53.33% and 60.98%, respectively, while the rate of hTERT mRNA expression was 10.00%, 39.13%, 66.67% and 85.37% and the rate of hTERT protein expression was 0%, 30.43%, 60.00% and 78.05%, respectively. All the three parameters were significantly increased in dysplasia and carcinoma compared to normal mucosa, while the expression levels were also significantly higher in carcinoma than in intestinal metaplasia (P<0.05). In gastric cancer tissues, nuclear staining rates of p65 and hTERT protein were both significantly associated with the degree of differentiation, lymph node metastasis, clinical stage and invasion depth (P<0.05). However, hTERT mRNA expression was only significantly associated with clinical stage. There was a positive correlation between p65 and hTERT mRNA (rs=0.661-0.752, P<0.01), and between hTERT protein and hTERT mRNA (rs=0.609-0.750, P<0.01). CONCLUSION: NF-kappaBp65 and hTERT expressions are upregulated at the early stage of gastric carcinogenesis. NF-kappaB activation may contribute to hTERT expression and thereby enhance telomerase activity, which represents an important step in carcinogenesis progress.
AIM: To investigate the expression of NF-kappaBp65 protein and humantelomerase reverse transcriptase (hTERT) and their correlation in gastric cancer and precancerous lesions. METHODS: Forty-one patients with primary gastric cancer, 15 with dysplasia, 23 intestinal metaplasia and 10 with normal gastric mucosa were included in this study. Expression of NF-kappaBp65 protein, hTERT mRNA and protein were determined by immunohistochemistry and in situ hybridization. RESULTS: The rate of p65 expression in normal gastric mucosa, intestinal metaplasia, dysplasia and carcinoma was 0%, 34.78%, 53.33% and 60.98%, respectively, while the rate of hTERT mRNA expression was 10.00%, 39.13%, 66.67% and 85.37% and the rate of hTERT protein expression was 0%, 30.43%, 60.00% and 78.05%, respectively. All the three parameters were significantly increased in dysplasia and carcinoma compared to normal mucosa, while the expression levels were also significantly higher in carcinoma than in intestinal metaplasia (P<0.05). In gastric cancer tissues, nuclear staining rates of p65 and hTERT protein were both significantly associated with the degree of differentiation, lymph node metastasis, clinical stage and invasion depth (P<0.05). However, hTERT mRNA expression was only significantly associated with clinical stage. There was a positive correlation between p65 and hTERT mRNA (rs=0.661-0.752, P<0.01), and between hTERT protein and hTERT mRNA (rs=0.609-0.750, P<0.01). CONCLUSION:NF-kappaBp65 and hTERT expressions are upregulated at the early stage of gastric carcinogenesis. NF-kappaB activation may contribute to hTERT expression and thereby enhance telomerase activity, which represents an important step in carcinogenesis progress.
Authors: N Sasaki; T Morisaki; K Hashizume; T Yao; M Tsuneyoshi; H Noshiro; K Nakamura; T Yamanaka; A Uchiyama; M Tanaka; M Katano Journal: Clin Cancer Res Date: 2001-12 Impact factor: 12.531
Authors: M Meyerson; C M Counter; E N Eaton; L W Ellisen; P Steiner; S D Caddle; L Ziaugra; R L Beijersbergen; M J Davidoff; Q Liu; S Bacchetti; D A Haber; R A Weinberg Journal: Cell Date: 1997-08-22 Impact factor: 41.582
Authors: J Nakayama; H Tahara; E Tahara; M Saito; K Ito; H Nakamura; T Nakanishi; E Tahara; T Ide; F Ishikawa Journal: Nat Genet Date: 1998-01 Impact factor: 38.330
Authors: R C Turkington; C Purcell; C R James; J Millar; E Napier; D Law; R Gallagher; M Morris; R H Wilson; M M Eatock Journal: Invest New Drugs Date: 2013-05-11 Impact factor: 3.850