We recently showed that non-small cell lung carcinomas (NSCLCs) are of dismal prognosis when encompassing accelerated autophagic activity. The regulation of this abnormally functioning degradation system and its association with hypoxia and apoptosis in lung carcinoma patients is unexplored. In this study we used 115 NSCLC tissues to examine the immunohistochemical expression of four distinct molecules - the major regulator of autophagy Beclin 1, the anti-apoptotic and anti-autophagic protein Bcl-2, the pro-apoptotic and pro-autophagic protein BNIP3, and a marker of hypoxia and glucolysis, the glucose transporter Glut 1. Most cases showed reduced reactivity for Beclin 1 (62%) and Bcl-2 (82%) proteins, almost half of our sample revealed strong BNIP3 expression (57%), whereas most of the carcinomas strongly expressed Glut 1 antigen (71%). Beclin 1 expression showed no association with survival. Bcl-2 positivity was a marker of good prognosis (p = 0.04), whereas BNIP3 (p = 0.0004) and Glut 1 (p = 0.03) expression correlated with poor outcome in Stage I disease. Autophagic status was negatively associated with Bcl-2 (p = 0.0006), but positively with Glut 1 expression (p = 0.001). In conclusion, the accelerated autophagic status in NSCLC is unrelated to Beclin 1 and BNIP3 expression, but does show significant association with Bcl-2 reactivity. Furthermore, we showed important correlations between glucolysis and autophagy, guiding new pathways in future lung carcinoma research.

译文

我们最近发现,当包括加速的自噬活性时,非小细胞肺癌 (nsclc) 的预后很差。尚未探索这种功能异常的降解系统的调节及其与肺癌患者缺氧和凋亡的关系。在这项研究中,我们使用了115个NSCLC组织来检查四个不同分子的免疫组织化学表达-自噬的主要调节剂Beclin 1,抗凋亡和抗自噬蛋白Bcl-2,促凋亡和自噬蛋白BNIP3,以及缺氧和葡萄糖溶解的标志物,葡萄糖转运蛋白Glut 1。大多数病例显示对Beclin 1 (62%) 和Bcl-2 (82%) 蛋白的反应性降低,几乎一半的样本显示BNIP3强表达 (57%),而大多数癌强烈表达Glut 1抗原 (71%)。Beclin 1表达与生存率无关。Bcl-2阳性是预后良好的标志 (p = 0.04),而BNIP3 (p = 0.0004) 和Glut 1 (p = 0.03) 表达与I期疾病不良预后相关。自噬状态与Bcl-2呈负相关 (p = 0.0006),但与Glut 1表达呈正相关 (p = 0.001)。总之,NSCLC的加速自噬状态与Beclin 1和BNIP3表达无关,但确实显示出与Bcl-2反应性的显着关联。此外,我们还显示了葡萄糖溶解与自噬之间的重要相关性,为未来肺癌研究提供了新的途径。

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