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A Cell Culture Model for Studying the Role of Neuron-Glia Interactions in Ischemia
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Neutrophils do not contribute to infarction, oxidative stress, and NO synthase activity in severe brain ischemia

Virginie Beray-Berthat1, Bruno Palmier, Michel Plotkine

  • 1Laboratoire de Pharmacologie, UPRES EA2510, Université René Descartes, F-75006, Paris, France.

Experimental Neurology
|August 5, 2003
PubMed

Insights

Polymorphonuclear leukocytes (PMNs) do not contribute to brain damage in a severe cerebral ischemia model. Reducing PMN infiltration did not alter infarct volume, oxidative stress, or nitric oxide production.

Area of Science:

  • Neuroscience
  • Immunology
  • Pathophysiology

Background:

  • Polymorphonuclear leukocytes (PMNs) are implicated in ischemia-reperfusion-induced brain damage.
  • The role of PMNs in severe transient focal cerebral ischemia requires further investigation.

Purpose of the Study:

  • To determine if PMN infiltration is detrimental in a severe rat model of transient focal cerebral ischemia.
  • To assess the contribution of PMNs to oxidative stress and nitric oxide (NO) production post-ischemia.

Main Methods:

  • A 20-minute occlusion of the middle cerebral artery and common carotid arteries in rats.
  • Induction of neutropenia using vinblastine to reduce PMN infiltration.
  • Assessment of infarct volume, PMN accumulation, oxidative stress (glutathione), and NO synthase activity at 24 and 48 hours post-reperfusion.

Main Results:

  • Infarction peaked at 24 hours, while significant PMN accumulation occurred at 48 hours post-reperfusion.
  • Vinblastine-induced neutropenia reduced PMN infiltration by 60-80% but did not decrease infarct volume.
  • Decreased PMN infiltration did not affect oxidative stress or NO synthase activities.

Conclusions:

  • PMNs do not appear to contribute to cerebral injury in this severe transient focal cerebral ischemia model.
  • Anti-PMN strategies may not be effective for treating brain injury in all pathological conditions.

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