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Related Experiment Video

Updated: Dec 31, 2025

Isolation and Flow Cytometric Assessment of Neuroimmune Interactions in a Mini-Stroke Murine Model
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Aging exacerbates neutrophil pathogenicity in ischemic stroke.

Meaghan A Roy-O'Reilly1, Hilda Ahnstedt1, Monica S Spychala1

  • 1Department of Neurology, University of Texas Health Science Center, Houston, TX 77030, USA.

Aging
|January 14, 2020
PubMed
Summary

Aging worsens neutrophil function after ischemic stroke, increasing mortality and morbidity. Targeting neutrophils after stroke benefits aged individuals, suggesting new therapeutic strategies for older stroke patients.

Keywords:
agingimmunologyischemiaischemic strokeneuroinflammation

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Area of Science:

  • Neuroscience
  • Immunology
  • Gerontology

Background:

  • Ischemic stroke is a leading cause of death and disability globally.
  • Advanced age is a significant risk factor for poor stroke outcomes.
  • Neutrophils play a critical role in the brain following ischemic stroke, and aging may alter their function.

Purpose of the Study:

  • To investigate the hypothesis that aging enhances neutrophil pro-inflammatory function, contributing to poorer stroke outcomes.
  • To determine the correlation between age, neutrophil function, and stroke outcomes in both human patients and a mouse model.

Main Methods:

  • Analysis of demographic data and biological specimens from ischemic stroke patients.
  • Utilizing an experimental mouse model of ischemic stroke.
  • Assessing neutrophil function, including reactive oxygen species generation.
  • Administering neutrophil depletion therapy via monoclonal antibodies.

Main Results:

  • In human patients, older age correlated with increased mortality, morbidity, and higher levels of neutrophil-activating cytokines.
  • Aged mice exhibited higher stroke mortality, morbidity, and elevated neutrophil-activating cytokines compared to young mice.
  • Aged mice showed enhanced neutrophil reactive oxygen species generation post-stroke.
  • Neutrophil depletion after stroke improved long-term functional outcomes in aged animals but not in young ones.

Conclusions:

  • Aging is associated with increased neutrophil pathogenicity in the context of ischemic stroke.
  • Neutrophil-targeted therapies may offer greater therapeutic benefits for older individuals who have experienced a stroke.