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Seizure-induced neutrophil adhesion in brain capillaries leads to a decrease in postictal cerebral blood flow.

Hyun-Kyoung Lim1,2, Sungjun Bae3,4, Kayoung Han1,2

  • 1Biomedical Institute for Convergence at SKKU (BICS), Sungkyunkwan University, Suwon 16419, South Korea.

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Summary

Seizures cause prolonged low cerebral blood flow (CBF) due to neutrophil adhesion in brain capillaries. Blocking this adhesion with specific antibodies restores normal CBF, suggesting a mechanism for postictal neurological dysfunction in epilepsy.

Keywords:
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Area of Science:

  • Neuroscience
  • Epilepsy Research
  • Cerebrovascular Physiology

Background:

  • Postictal neurological dysfunction in epilepsy is common.
  • Cerebral hypoperfusion is a proposed cause, but mechanisms remain unclear.
  • Understanding the causes of reduced cerebral blood flow (CBF) post-seizure is crucial.

Purpose of the Study:

  • To investigate the mechanisms underlying prolonged postictal cerebral hypoperfusion.
  • To identify the cellular and molecular players involved in seizure-induced reductions in CBF.
  • To explore potential therapeutic targets for postictal neurological deficits.

Main Methods:

  • Measured cerebral blood flow (CBF) changes in an epilepsy model.
  • Investigated early and late phases of hypoperfusion.
  • Examined the role of arteriolar constriction, neutrophil adhesion, and ICAM-1 expression.
  • Administered antibodies targeting neutrophils (Ly6G) and adhesion molecules (LFA-1).

Main Results:

  • A 30% reduction in postictal CBF was observed.
  • Early hypoperfusion (up to 30 min) was linked to arteriolar constriction.
  • Prolonged hypoperfusion (>1 hour) involved neutrophil adhesion to brain capillaries, decreased red blood cell (RBC) flow, capillary constriction, and elevated intercellular adhesion molecule-1 (ICAM-1).
  • Antibody treatment prevented neutrophil adhesion and normalized prolonged CBF reductions.

Conclusions:

  • Seizure-induced neutrophil adhesion to cerebral microvessels, mediated by ICAM-1, causes prolonged postictal hypoperfusion.
  • This prolonged hypoperfusion may contribute to neurological dysfunction following seizures.
  • Targeting neutrophil adhesion presents a potential therapeutic strategy for epilepsy.