Infect Immun:牙周致病菌可导致动脉粥样硬化的发生

2015-09-14 MedSci MedSci原创

Infect Immun:牙周致病菌可导致动脉粥样硬化的发生牙周炎是心脏病发生的一个危险因素,目前有研究表明,牙周致病菌可引起机体基因表达的改变,促进主动脉平滑肌细胞炎症及动脉粥样硬化的发生,该研究成果发表于《感染与免疫杂志》。牙龈卟啉单胞菌,牙周的一个主要致病菌,目前已在心脏病患者的动脉斑块中发现。来自瑞典厄勒布鲁大学卫生科学学院临床医学系的研究人员进行了两项动物实验,发现牙龈卟啉单胞菌可引起并

牙周炎是心脏病发生的一个危险因素,目前有研究表明,牙周致病菌可引起机体基因表达的改变,促进主动脉平滑肌细胞炎症及动脉粥样硬化的发生,该研究成果发表于《感染与免疫杂志》。

牙龈卟啉单胞菌是牙周的一个主要致病菌,目前已在心脏病患者的动脉斑块中发现。来自瑞典厄勒布鲁大学卫生科学学院临床医学系的研究人员进行了两项动物实验,发现牙龈卟啉单胞菌可引起并加速冠状动脉及主动脉粥样硬化斑块的形成。

研究人员培养了人主动脉平滑肌细胞,并用牙龈卟啉单胞菌感染这些细胞。结果发现,牙龈卟啉单胞菌所产生的毒力因子——牙龈蛋白酶(Gingipains),可增加平滑肌细胞内促炎性血管生成素2的表达抑制促炎性血管生成素1的表达。而炎症在动脉粥样硬化的发展过程中扮演了重要的角色。

“刺激主动脉平滑肌细胞可产生低水平的血管生成素2,但是刺激野生型牙龈卟啉单胞菌时则可显著增加主动脉平滑肌细胞内基因表达的血管生成素2的水平,”研究人员写道。

“血管生成素2可直接提高主动脉平滑肌细胞的迁移,”该研究第一作者Boxi Zhang说道,“平滑肌细胞的迁移参与了动脉粥样硬化的发病机制。”

与牙龈蛋白酶一样,肿瘤坏死因子(TNF),炎性细胞因子以及心血管发生的危险因子也可通过两种血管生成素诱导并促进动脉粥样硬化的发生。然而,研究人员发现,牙龈素可独立于TNF之外诱导并促进动脉粥样硬化的发生。

“我们的研究阐明了牙周炎与心血管疾病之间的关联,”Zhang说道,“我们的目标是寻找可帮助我们诊断并治疗牙周炎及心血管疾病的生物标志物。”

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    2016-09-13 1e10c84am36(暂无匿称)

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    2015-09-16 cooco

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