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Title: Aging Exacerbates Neuroinflammatory Outcomes Induced by Acute Ozone Exposure

Journal Article · · Toxicological Sciences
 [1];  [2];  [3];  [3];  [3];  [3];  [2];  [2];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of New Mexico, Albuquerque, NM (United States)
  2. Univ. of New Mexico Health Sciences Center, Albuquerque, NM (United States)
  3. Univ. of New Mexico, Albuquerque, NM (United States)

The role of environmental stressors, particularly exposure to air pollution, in the development of neurodegenerative disease remains underappreciated. We examined the neurological effects of acute ozone (O3) exposure in aged mice, where increased blood brain barrier (BBB) permeability may confer vulnerability to neuroinflammatory outcomes. C57BL/6 male mice, aged 8-10 weeks or 12–18 months were exposed to either filtered air (FA) or 1.0 ppm O3 for 4 hours; animals received a single IP injection of sodium fluorescein (FSCN) 20 hours post-exposure. One-hour post-FSCN injection, animals were transcardially perfused for immunohistochemical analysis of BBB permeability. β-amyloid protein expression was assessed via ELISA. Flow cytometric characterization of infiltrating immune cells, including neutrophils, macrophages, and microglia populations was performed 20 hours post-O3 exposure. Flow cytometry analysis of brains revealed increased microglia “activation” and presentation of CD11b, F4/80 and MHCII in aged animals relative to younger ones; these age-induced differences were potentiated by acute O3 exposure. Cortical and limbic regions in aged brains had increased reactive microgliosis and β-amyloid protein expression after O3 insult. The aged cerebellum was particularly vulnerable to acute O3 exposure with increased populations of infiltrating neutrophils, peripheral macrophages/monocytes, and Ly6C+ inflammatory monocytes after insult, which were not significantly increased in the young cerebellum. O3 exposure increased the penetration of FSCN beyond the BBB, the infiltration of peripheral immune cells, and reactive gliosis of microglia. Furthermore, the aged BBB is vulnerable to insult and becomes highly penetrable in response to O3 exposure, leading to greater neuroinflammatory outcomes.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1419764
Report Number(s):
LA-UR-18-20155
Journal Information:
Toxicological Sciences, Vol. 163, Issue 1; ISSN 1096-6080
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Development of a large-scale computer-controlled ozone inhalation exposure system for rodents journal January 2019
Co-exposure to ambient PM 2.5 plus gaseous pollutants increases amyloid β1–42 accumulation in the hippocampus of male and female rats journal May 2019
Ozone-Induced Dysregulation of Neuroendocrine Axes Requires Adrenal-Derived Stress Hormones journal August 2019
111 In-DANBIRT In Vivo Molecular Imaging of Inflammatory Cells in Atherosclerosis journal November 2018
Serum-borne factors alter cerebrovascular endothelial microRNA expression following particulate matter exposure near an abandoned uranium mine on the Navajo Nation journal July 2020
Planetary Health and the Future of Human Capacity: The Increasing Impact of Planetary Distress on the Human Brain journal November 2018
Development of a large-scale computer-controlled ozone inhalation exposure system for rodents text January 2019
Alzheimer and depressive cognitive-like behaviors in male and female rats: A new method for exposure to ambient air pollution journal January 2019

Figures / Tables (11)