Correlation between expression of
CARMA1 and NF-κB proteins in common subtypes of gastrointestinal B cell lymphoma.
Shijie Huaren Xiaohua Zazhi 2013;
21:2641-2648. [DOI:
10.11569/wcjd.v21.i26.2641]
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Abstract
AIM: To investigate the relationship between the expression of CARMA1 and nuclear factor κB (NF-κB) proteins in common subtypes of gastrointestinal B cell lymphoma.
METHODS: Fifty-four specimens of lymphomas, including 34 cases of diffuse large B-cell lymphoma (DLBCL) and 20 cases of mucosa-associated lymphoid tissue (MALT) lymphoma, and 21 specimens of gastrointestinal reactive lymphoid hyperplasia (GRLH) were selected for H&E staining and immunohistochemical staining. The mRNA and protein expression of CARMA1 was detected by Real-time PCR and immunohistochemistry, respectively. Expression of NF-κB proteins was assayed by immunohistochemistry.
RESULTS: The positive rates of CARMA1, NF-κB/p65 and NF-κB/p50 proteins were significantly higher in lymphomas than in GRLH (75.9% vs 47.6%, 48.2% vs 14.3%, 38.9% vs 9.5%; P = 0.042, 0.007, 0.013). The expression levels of CARMA1 mRNA and protein were significantly higher in DLBCL than in MALT lymphoma (P = 0.019, 0.020). There were significant differences in CARMA1 protein expression between lymphomas which were positive and negative for NF-κB/p65 or NF-κB/p50 (84.6% vs 67.9%, 71.4% vs 78.8%, P = 0.030, 0.031). CARMA1 mRNA expression was significantly higher in advanced cases than in early disease (P = 0.011). Expression of CARMA1 protein was significantly higher in cases which infiltrated through the wall than in those which did not (91.7% vs 66.7%, P = 0.003). The levels of CARMA1 mRNA and protein were significantly higher in cases with a high proliferation rate (P = 0.035, 0.006). Expression of NF-κB/p65 and NF-κB/p50 proteins was obviously increased in cases with a later TNM stage or a high proliferation rate (P = 0.015, 0.05, 0.018, 0.001). The type of lymphoma, stage, CARMA1 and NF-κB/p65 protein expression were independent factors affecting the prognosis of lymphomas. Survival was poor in cases with strong expression of CARMA1 protein than in those without (P = 0.02).
CONCLUSION: Expression of CARMA1 was correlated with that of NF-κB in gastrointestinal MALT lymphoma and DLBCL. CARMA1 expression may induce activation of NF-κB and thereby participate in the pathogenesis and progression of gastrointestinal MALT lymphoma and DLBCL.
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