Expression of COX-2, NF-kappaB-p65, NF-kappaB-p50 and IKKalpha in malignant and adjacent normal human colorectal tissue.

Expression of COX-2, NF-kappaB-p65, NF-kappaB-p50 and IKKalpha in malignant and adjacent normal human colorectal tissue.
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DOI:
10.1038/sj.bjc.6605120
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发表时间:
2009-07-07
影响因子:
8.8
通讯作者:
--
中科院分区:
医学1区
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--
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环氧合酶-2(考克斯-2)在结直肠肿瘤中选择性过表达。尽管有证据表明核因子(NF)-κB和考克斯-2之间可能存在联系,但这些肿瘤中考克斯-2诱导的机制尚未完全了解。我们假设考克斯-2的表达与NF-κB-p65、NF-κB-p50和Iκ B-激酶-α(IKKα)在人结直肠癌上皮细胞和间质细胞中的表达相关。采用免疫组织化学方法检测了32例结直肠癌患者的非肿瘤组织和癌旁组织中考克斯-2、NF-κ B-p65、NF-κ B-p65核定位序列(NLS)、NF-κ B-p50、NF-κB-p50 NLS和IKKα蛋白的表达。我们已经发现恶性肿瘤和周围正常结直肠组织的基质细胞表达考克斯-2。在恶性组织的所有细胞类型中,以及在邻近正常组织的血管内皮细胞(VECs)中,考克斯-2表达与NF-κB-p65表达强烈相关(Pearson相关性,巨噬细胞P=0.019,VEC P=0.001,成纤维细胞P=0.002(恶性组织),VEC P=0.011(非恶性组织)),但NF-κB-p50或IKKα无相关性。这些数据表明,在这些细胞中,考克斯-2的诱导可能是通过激活经典NF-κB途径介导的。最后,间质细胞中考克斯-2、NF-κB-p65或IKKα与结直肠癌临床严重程度(由杜克分期确定)之间缺乏相关性,表明考克斯-2、NF-κB-p65和IKKα表达可能是早期启动后事件,可能参与肿瘤进展。
Cyclooxygenase-2 (COX-2) is selectively over-expressed in colorectal tumours. The mechanism of COX-2 induction in these tumours is not fully understood, although evidence suggests a possible link between nuclear factor (NF)-κB and COX-2. We hypothesised an association between COX-2 expression and NF-κB-p65, NF-κB-p50 and IκB-kinase-α (IKKα) in both epithelial and stromal cells in human colorectal cancer. Using immunohistochemistry, we measured COX-2, NF-κB-p65, NF-κB-p65 nuclear localisation sequence (NLS), NF-κB-p50, NF-κB-p50 NLS and IKKα protein expression in matched colorectal biopsy samples comprising both non-tumour and adjacent tumour tissue from 32 patients with colorectal cancer. We have shown that stromal cells of malignant and surrounding normal colorectal tissue express COX-2. In all cell types of malignant tissue, and in vascular endothelial cells (VECs) of neighbouring normal tissue, COX-2 expression was strongly associated with NF-κB-p65 expression (Pearson's correlation, P=0.019 for macrophages, P=0.001 for VECs, P=0.002 for fibroblasts (malignant tissue), and P=0.011 for VECs (non-malignant tissue)) but not NF-κB-p50 or IKKα. These data suggest that in these cells COX-2 induction may be mediated through activation of the canonical NF-κB pathway. Finally, the lack of association between COX-2, NF-κB-p65 or IKKα in stromal cells with the clinical severity of colorectal cancer as determined by Duke's stage, suggests that COX-2, NF-κB-p65 and IKKα expression are possibly early post-initiation events, which could be involved in tumour progression.
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