Scieszka David, Hulse Jonathan, Gu Haiwei, Barkley-Levenson Amanda, Barr Ed, Garcia Marcus, Begay Jessica G, Herbert Guy, McCormick Mark, Brigman Jonathan, Ottens Andrew, Bleske Barry, Bhaskar Kiran, Campen Matthew J
Department of Pharmaceutical Sciences, 1 University of New Mexico College of Pharmacy, MSC09 5360, Albuquerque, NM, 87131-0001, USA.
Department of Molecular Genetics and Microbiology, Department of Neurology, School of Medicine, University of New Mexico Albuquerque, Albuquerque, NM, 87131, USA.
Part Fibre Toxicol. 2025 Sep 1;22(1):23. doi: 10.1186/s12989-025-00639-4.
BACKGROUND: Wildland fires in the United States have increased in frequency and scale over the past 30 years exposing millions of people to hazardous air pollutants. Among others, aging individuals are particularly vulnerable to the effects of wildfire smoke. In this study, we assessed the neurobiological impacts of wood smoke (WS) on aged mice and the potential of anti-aging therapeutics to mitigate these impacts. METHODS: Female C57BL/6 J mice, aged 18 months, were divided into 10 groups and exposed to either filtered air (FA; 5 groups) or biomass derived WS (5 groups) for 4 h/day, every other day, for 14 days (7 exposures total) with an average particulate matter (PM) concentration of 448 µg/m per exposure. One FA control group and one WS exposed group were euthanized 24 h after the last exposure. The remaining 8 groups (4 FA and 4 WS exposed) were treated with either vehicle control, resveratrol and nicotinamide mononucleotide (RNMN), dasatinib and quercetin (DQ), or both RNMN and DQ (RNDQ) for 10 weeks. RESULTS: A significant reduction in NAD + within the prefrontal cortex was observed following the 14-day exposure to WS along with a reduction in serotonin. Serotonin reductions were observed up to 10 weeks post-exposure and co-occurred with neuroinflammation and behavioral alterations, including increased immobility in a forced swim test. RNMN conferred the greatest mitigating effect after WS exposure, while RNDQ treatment resulted in an upregulation of markers associated with aging in the brain. While the metabolic shift in the PFC following WS exposure was relatively modest, mice exposed to FA and vehicle control (10 weeks of natural aging) exhibited the greatest metabolic shift, including perturbed nicotinamide metabolism. CONCLUSION: Taken together, these findings highlight that subacute (14-day) exposure to WS results in persistent neurometabolomic and behavioral alterations in an aged mouse model and that intervention with RNMN may be a useful strategy to mitigate the adverse neurological outcomes observed. Further studies are needed to assess the specific impact of either resveratrol or NMN in isolation and to fully elucidate age-specific, as well as sex- and species-determinant, WS exposure response pathways.
背景:在过去30年中,美国的野火发生频率和规模都有所增加,使数百万人暴露于有害空气污染物中。其中,老年人尤其容易受到野火烟雾影响。在本研究中,我们评估了木烟(WS)对老年小鼠的神经生物学影响以及抗衰老疗法减轻这些影响的潜力。 方法:将18个月大的雌性C57BL/6 J小鼠分为10组,分别暴露于过滤空气(FA;5组)或生物质衍生的WS(5组)中,每天4小时,隔天一次,共14天(总共7次暴露),每次暴露的平均颗粒物(PM)浓度为448μg/m。最后一次暴露后24小时,对一个FA对照组和一个WS暴露组实施安乐死。其余8组(4组FA暴露组和4组WS暴露组)分别用载体对照、白藜芦醇和烟酰胺单核苷酸(RNMN)、达沙替尼和槲皮素(DQ)或RNMN与DQ两者(RNDQ)进行处理,持续10周。 结果:在暴露于WS 14天后,观察到前额叶皮质内的NAD +显著减少,同时血清素也减少。在暴露后长达10周内均观察到血清素减少,且与神经炎症和行为改变同时出现,包括强迫游泳试验中不动时间增加。WS暴露后,RNMN的减轻作用最大,而RNDQ处理导致大脑中与衰老相关的标志物上调。虽然WS暴露后前额叶皮质的代谢变化相对较小,但暴露于FA和载体对照(自然衰老10周)的小鼠表现出最大的代谢变化,包括烟酰胺代谢紊乱。 结论:综上所述,这些发现突出表明,在老年小鼠模型中,亚急性(14天)暴露于WS会导致持续的神经代谢组学和行为改变,并且用RNMN进行干预可能是减轻所观察到的不良神经学结果的有用策略。需要进一步研究来评估单独使用白藜芦醇或NMN的具体影响,并充分阐明特定年龄以及性别和物种决定的WS暴露反应途径。
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