Abstract:
AIM:To determine the incidence of Epstein Barr virus associated gastric carcinoma (GC) in Brazil and compare the expressions of apoptosis related proteins and nitric oxide synthases between EBV positive and negative gastric carcinoma. METHODS:In situ hybridization of EBV-encoded small RNA-1 (EBER-1) and PCR was performed to identify the presence of EBV in GCs. Immunohistochemistry was used to identify expressions of bcl-2, bcl-xl, bak, bax, p53, NOS-1, NOS-2, and NOS-3 proteins in 25 EBV positive GCs and in 103 EBV negative GCS. RESULTS:12% of the cases of GC (25/208) showed EBER-1 and EBNA-1 expression. The cases were preferentially of diffuse type with intense lymphoid infiltrate in the stroma. EBV associated GCs showed higher expression of bcl-2 protein and lower expression of bak protein than in EBV negative GCs. Indeed, expressions of NOS-1 and NOS-3 were frequently observed in EBV associated GCs. CONCLUSION:Our data suggest that EBV infection may protect tumor cells from apoptosis, giving them the capacity for permanent cell cycling and proliferation. In addition, EBV positive GCs show high expression of constitutive NOS that could influence tumor progression and aggressiveness.
journal_name
World J Gastroenteroljournal_title
World journal of gastroenterologyauthors
Begnami MD,Montagnini AL,Vettore AL,Nonogaki S,Brait M,Simoes-Sato AY,Seixas AQ,Soares FAdoi
10.3748/wjg.v12.i31.4959subject
Has Abstractpub_date
2006-08-21 00:00:00pages
4959-65issue
31eissn
1007-9327issn
2219-2840journal_volume
12pub_type
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pub_type: 杂志文章,随机对照试验
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