Abstract
AIM: To determine the expression of nuclear factor kappa B (NF-κB) in human gastric precancerous lesions and carcinoma and its correlation with CagA+H. pylori infection.
METHODS: The expression of NF-κB p65 was detected by immunohistochemistry (SABC assay), and H. pylori were examined using 14C-breath test, rapid urease test and Warthin-Starry staining in patients with chronic superficial gastritis (CSG: n = 34), intestinal metaplasia (IM: n = 31), atypical dysplasia (AD: n = 34) and gastric cancer (GC: n = 55). Serum CagA IgG antibody was detected by dot immunogold filtration assay. The correlations of NF-κB p65 expression with CagA+H. pylori infection as well as the histological types, clinicopathological stages and lymph node metastasis were analyzed.
RESULTS: The expression of NF-κB p65 in CSG, IM, AD, GC was 15.0%, 41.9%, 64.7%, and 78.2%, respectively, and there were significant differences between them (χ2 = 43.98, P <0.01). The rates of H. pylori infection were 70.0%, 67.7%, 73.5%, and 54.5%, respectively, and there were no significant differences between them (P > 0.05). The percentage of CagA+H. pylori infection were 53.6%, 61.9%, 68.0%, and 73.3%, respectively, and there were no significantdifferences (P > 0.05). In IM, the positive rate of NF-κB p65 expression in H. pylori or CagA+H. pylori positive patients were significantly higher than that in patients without H. pylori infection or with CagA- H. pylori infection (57.1%, 76.9% vs 10%, 25.0%, P <0.05). In GC patients, the positive expression of NF-κB p65 was correlation with the T stages(χ2 = 5.91, P <0.05)and lymph node metastasis (χ2 = 7.47, P <0.01), but not with the pathohistological types (P > 0.05).
CONCLUSION: NF-κB is constitutively activated in human gastric precancerous lesions and carcinoma tissue and correlates with tumor progression. The early activation may be related to CagA+H. pylori infection.
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