Br J Cancer:牙龈卟啉单胞菌Pg感染加剧食道癌的发展并增强新辅助化疗耐药性

2021-05-14 xiaozeng MedSci原创

既往研究显示,遗传易感性占所有肿瘤的5-10%,其余病例归因于体细胞突变。

既往研究显示,遗传易感性占所有肿瘤的5-10%,其余病例归因于体细胞突变。微生物已被确定为某些癌症的重要危险因素,在全球范围内每年约有200万例新病例归因于微生物的感染

牙龈卟啉单胞菌(Pg)是一种革兰氏阴性细菌,是牙周疾病和其他全身性疾病中明显的病原体。Pg的定殖可以破坏口腔细菌群落的稳态、重塑宿主的免疫系统,并通过修饰一系列信号蛋白来改变宿主细胞的行为和表型。


在所有癌症中,食道癌是第七大最常见的死亡原因,近期的研究发现,Pg可以定殖并感染人食道上皮,且与食道鳞状细胞癌(ESCC)的发生发展相关。至关重要的是,Pg感染影响手术和新辅助化疗(NACT)后ESCC患者的预后评估。但其对化疗疗效以及食道癌细胞凋亡抗性和增殖的影响仍知之甚少。

在该研究中,研究人员分析了312例ESCC食管切除术患者的临床病理数据、计算机断层扫描成像结果以及接受新辅助化疗(NACT)患者亚组(n=85)的纵向癌变组织样本。


通过多变量Cox分析和反应评估,比较了感染Pg和未感染Pg患者的总生存率和对NACT的反应率。并在ESCC患者中检测Pg对细胞增殖和药物诱导凋亡的影响。

Pg感染ESCC患者的预后较差

结果显示,Pg阳性患者的5年总生存期较低,研究人员发现,Pg感染与多种临床病理因素以及病理性肿瘤、淋巴结、疾病转移阶段相关。在接受NACT治疗的85例患者中,Pg感染对应着较低的缓解率和5年总体生存率。


进一步的研究显示,Pg感染能够诱导ESCC细胞凋亡抗性的产生并提高ESCC细胞的活性,该现象也在纵向癌变组织样品中得到证实。而Pg诱导的凋亡抗性依赖于菌毛和STAT3的表达。

Pg感染诱导凋亡抗性的产生并促进ESCC细胞的增殖

总而言之,该研究结果揭示,Pg感染与ESCC患者较差的预后、化疗效果的降低相关,且可增强ESCC细胞的侵袭能力。


原始出处:

Gao, S., Liu, Y., Duan, X. et al. Porphyromonas gingivalis infection exacerbates oesophageal cancer and promotes resistance to neoadjuvant chemotherapy. Br J Cancer (12 May 2021).

 

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