Abstract:
BACKGROUND:Although caspase recruitment domain (CARD) membrane-associated guanylate kinase (MAGUK) protein 1 (CARMA1) and CARD9 play important roles in lymphocyte activation, the significance of CARMA1 and CARD9 in the pathogenesis of gastric mucosa-associated lymphoid tissue (MALT) lymphoma remains to be elucidated. METHODS:By using reverse transcription-polymerase chain reaction analysis, the expression levels of mRNA of CARMA1, CARD9, Bcl10, and the apoptosis inhibitor 2 (API2)-MALT1 chimeric transcript were determined in tissue specimens from 65 patients with primary gastric B-cell lymphoma (43 patients with low-grade MALT lymphoma, 16 patients with MALT lymphoma plus diffuse large B-cell lymphoma [DLBL], and 6 patients with DLBL without MALT lymphoma) and in tissue specimens from 18 patients with chronic gastritis. The expression levels of CARMA1 and BCL10 were examined immunohistochemically in 30 patients with lymphoma. RESULTS:CARMA1 mRNA was detected in 55% of lymphoma patients but in only 17% of chronic gastritis patients. The positive rates for CARD9, Bcl10, and API2-MALT1 chimeric transcript in the lymphoma patients were 48%, 98%, and 8%, respectively, whereas the 3 molecules were not detected in any specimens from patients with chronic gastritis. The expression of CARMA1 and CARD9 was frequent in the Helicobacter pylori-negative patients (100% and 86%, respectively), in the API2-MALT1 chimeric transcript-positive patients (100% and 100%, respectively), and in the specimens from patients who did not respond to H. pylori eradication (76% and 71%, respectively). In addition, CARMA1 expression was positive more frequently in patients of DLBL without MALT lymphoma (100%) than in patients of MALT lymphoma (51%). CARMA1 protein expression was correlated significantly with the expression of CARMA1 mRNA and also with the expression of nuclear BCL10. CONCLUSIONS:The overexpression of CARMA1 and CARD9 presumably is associated with the development or progression of gastric B-cell lymphoma, especially among patients who have disease in which the pathogenesis is not related to H. pylori.
journal_name
Cancerjournal_title
Cancerauthors
Nakamura S,Nakamura S,Matsumoto T,Yada S,Hirahashi M,Suekane H,Yao T,Goda K,Iida Mdoi
10.1002/cncr.21421subject
Has Abstractpub_date
2005-11-01 00:00:00pages
1885-93issue
9eissn
0008-543Xissn
1097-0142journal_volume
104pub_type
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