口腔链球菌利用炎症性巨噬细胞通过 NLRP6 炎性小体增加 IL-1B 的释放。

Inflammatory macrophages exploited by oral streptococcus increase IL-1B release via NLRP6 inflammasome.

机构信息

Department of Oral Biology, School of Dental Medicine, University at Buffalo, 3435 Main street, Buffalo, NY 14214, United States.

出版信息

J Leukoc Biol. 2023 Sep 27;114(4):347-357. doi: 10.1093/jleuko/qiad089.

Abstract

Chronic inflammatory periodontal disease develops in part from the infiltration of a large number of classically activated inflammatory macrophages that release inflammatory cytokines important for disease progression, including inflammasome-dependent interleukin (IL)-1β. Streptococcus gordonii is a normally commensal oral microorganism; while not causative, recent evidence indicates that commensal oral microbes are required for the full development of periodontal disease. We have recently reported that inflammatory macrophages counterintuitively allow for the increased survival of phagocytosed S. gordonii over nonactivated or alternatively activated macrophages. This survival is dependent on increased reactive oxygen species production within the phagosome of the inflammatory macrophages, and resistance by the bacterium and can result in S. gordonii damaging the phagolysosomes. Here, we show that activated macrophages infected with live S. gordonii release more IL-1β than non-activated macrophages infected with either live or dead S. gordonii, and that the survival of oral Streptococci are more dependent on macrophage activation than other Gram positive microbes, both classical pathogens and commensals. We also find that S. gordonii-dependent inflammatory macrophage inflammasome activation requires the cytoplasmic NLRP6. Overall, our results suggest S. gordonii is capable of evading immune destruction, increasing inflammatory mediators, and increasing inflammatory macrophage response, and that this ability is increased under conditions of inflammation. This work reveals additional mechanisms by which normally commensal oral streptococci-macrophage interactions can change, resulting in increased release of mature IL-1β, potentially contributing to an environment that perpetuates inflammation.

摘要

慢性炎症性牙周病部分是由大量经典激活的炎症巨噬细胞浸润引起的,这些巨噬细胞释放的炎症细胞因子对疾病进展很重要,包括依赖炎症小体的白细胞介素(IL)-1β。戈登链球菌是一种正常共生的口腔微生物;虽然不是致病因素,但最近的证据表明,共生口腔微生物是牙周病完全发展所必需的。我们最近报道称,炎症巨噬细胞反直觉地允许吞噬的 S. gordonii 比非激活或替代激活的巨噬细胞存活得更多。这种存活依赖于炎症巨噬细胞吞噬体中活性氧物质的产生增加,以及细菌的抵抗力,并且可能导致 S. gordonii 破坏吞噬溶酶体。在这里,我们表明,感染活 S. gordonii 的激活巨噬细胞释放的 IL-1β 多于感染活或死 S. gordonii 的非激活巨噬细胞,并且口腔链球菌的存活比其他革兰氏阳性微生物(包括经典病原体和共生菌)更依赖于巨噬细胞激活。我们还发现,S. gordonii 依赖的炎症性巨噬细胞炎性小体激活需要细胞质 NLRP6。总的来说,我们的研究结果表明,S. gordonii 能够逃避免疫破坏,增加炎症介质,并增加炎症性巨噬细胞的反应,而这种能力在炎症条件下会增加。这项工作揭示了通常共生的口腔链球菌-巨噬细胞相互作用发生变化的其他机制,导致成熟的 IL-1β 释放增加,可能导致炎症持续存在的环境。

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