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Expression of bcl-2 and p53 proteins in nasopharyngeal carcinoma. Absence of correlation with the presence of EBV encoded EBER1-2 transcripts and latent membrane protein-1

机译:bcl-2和p53蛋白在鼻咽癌中的表达。与EBV编码的EBER1-2转录本和潜伏膜蛋白1的存在不相关

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摘要

Aims—To investigate the immunohistochemical expression of bcl-2 and p53 proteins in nasopharyngeal carcinomas in relation to the expression of the Epstein-Barr virus (EBV) encoded EBER messenger RNAs (mRNAs) and latent membrane protein-1 (LMP-1).Methods—Formalin fixed, paraffin wax embedded tissue from 44 nasopharyngeal carcinomas (NPCs) was stained by immunohistochemistry for p53, bcl-2 and LMP-1 proteins and by RNA in situ hybridisation for EBER mRNAs.Results—The tumours were divided histologically into 13 cases of keratinising squamous cell NPC (KNPC), 15 cases of non-keratinising squamous cell NPC (NKNPC) and 16 cases of undifferentiated NPC (UNPC). Bcl-2 expression was observed in five of 15 NKNPC cases and in six of 16 UNPC cases; p53 expression was observed in one of 13 KNPC, two of 15 NKNPC and four of 16 UNPC cases. EBER 1-2 transcripts were detected in five of 15 NKNPC and nine of 16 UNPC cases, while LMP-1 expression was observed in one of 16 UNPC cases. All 13 KNPCs were EBV and bcl-2 negative. No correlation was found between the presence of EBER 1-2 transcripts and the detection of bcl-2 or p53 proteins, or both, in NPC cells.Conclusions—The expression of bcl-2 and p53 proteins may be associated with the level of the tumour cell differentiation in NPC. In addition, in view of the important role of the bcl-2 protein in the inhibition of apoptosis, the expression of bcl-2 protein may contribute to tumour cell survival in a proportion of NPCs. Furthermore, in the light of previous findings that the p53 gene in most UNPCs is in the wild-type configuration, mechanisms other than mutation may be responsible for stabilisation of the p53 protein in UNPCs.
机译:目的-研究鼻咽癌中bcl-2和p53蛋白与爱泼斯坦-巴尔病毒(EBV)编码的EBER信使RNA(mRNA)和潜伏膜蛋白-1(LMP-1)表达的免疫组织化学表达。方法-对44例鼻咽癌(NPC)的福尔马林固定,石蜡包埋的组织进行免疫组织化学染色,以检测p53,bcl-2和LMP-1蛋白,并通过RNA原位杂交对EBER mRNA进行染色。结果-将肿瘤按组织学方法分为13个角化鳞状上皮细胞NPC(KNPC)15例,非角化鳞状上皮细胞NPC(NKNPC)15例,未分化NPC(UNPC)16例。在15例NKNPC病例中有5例和16例UNPC病例中有6例观察到Bcl-2表达。在13例KNPC中有1例,15例NKNPC中有2例以及16例UNPC中有4例观察到p53表达。在15例NKNPC中有5例和16例UNPC中有9例检测到EBER 1-2转录本,而16例UNPC中有1例观察到LMP-1表达。所有13个KNPC均为EBV和bcl-2阴性。在NPC细胞中,EBER 1-2转录本的存在与bcl-2或p53蛋白或两者的检测之间没有相关性。结论-bcl-2和p53蛋白的表达可能与鼻咽癌的水平有关。 NPC中的肿瘤细胞分化。另外,鉴于bcl-2蛋白在抑制细胞凋亡中的重要作用,bcl-2蛋白的表达可能在一定比例的NPC中有助于肿瘤细胞的存活。此外,根据先前的发现,即大多数UNPC中的p53基因处于野生型构型,除突变以外的其他机制可能是UNPC中p53蛋白稳定的原因。

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