Caparon Michael, Xu Wei, Bradstreet Tara, Zou Zongsen, Hickerson Suzanne, Zhou Yuan, He Hongwu, Edelson Brian
Washington University School of Medicine.
Jiangxi Normal University.
Res Sq. 2023 Dec 23:rs.3.rs-3689163. doi: 10.21203/rs.3.rs-3689163/v1.
Disease Tolerance (DT) is a host response to infection that limits collateral damage to host tissues while having a neutral effect on pathogen fitness. Previously, we found that the pathogenic lactic acid bacterium manipulates DT using its aerobic mixed-acid fermentation (ARMAF) pathway via the enzyme pyruvate dehydrogenase (PDH) to alter expression of the immunosuppressive cytokine IL-10. However, the microbe-derived molecules that mediate communication with the host's DT pathways remain elusive. Here, we show that ARMAF inhibits accumulation of IL-10-producing inflammatory cells including neutrophils and macrophages, leading to delayed bacterial clearance and wound healing. Expression of IL-10 is inhibited through streptococcal production of the short chain fermentation end-products acetate and formate, via manipulation of host acetyl-CoA metabolism, altering non-histone regulatory lysine acetylation. A bacterial-specific PDH inhibitor reduced tissue damage during murine infection, suggesting that reprogramming carbon flow provides a novel therapeutic strategy to mitigate tissue damage during infection.
疾病耐受性(DT)是宿主对感染的一种反应,它限制了对宿主组织的附带损害,同时对病原体适应性产生中性影响。此前,我们发现致病性乳酸菌通过其需氧混合酸发酵(ARMAF)途径,经由丙酮酸脱氢酶(PDH)操纵DT,以改变免疫抑制细胞因子IL-10的表达。然而,介导与宿主DT途径通信的微生物衍生分子仍然难以捉摸。在这里,我们表明ARMAF抑制包括中性粒细胞和巨噬细胞在内的产生IL-10的炎性细胞的积累,导致细菌清除和伤口愈合延迟。IL-10的表达通过链球菌产生的短链发酵终产物乙酸盐和甲酸盐,经由操纵宿主乙酰辅酶A代谢、改变非组蛋白调节性赖氨酸乙酰化而受到抑制。一种细菌特异性PDH抑制剂减少了小鼠感染期间的组织损伤,这表明重新编程碳流提供了一种减轻感染期间组织损伤的新治疗策略。
Appl Environ Microbiol. 2019-10-16
Front Immunol. 2019-2-21