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Stereological and Flow Cytometry Characterization of Leukocyte Subpopulations in Models of Transient or Permanent Cerebral Ischemia
Published on: December 28, 2014
[Leucocytosis and leucocyte adhesion in brain ischemia development]
Rossiiskii Fiziologicheskii Zhurnal Imeni I.M. Sechenova
|July 31, 2009
Summary
Leukocyte adhesion to brain microvessels increases significantly during ischemia, independent of blood leukocyte count. Reduced blood leukocytes in severe brain ischemia may indicate increased adhesion, worsening microcirculation.
Area of Science:
- Neuroscience
- Immunology
- Pathophysiology
Context:
- Brain ischemia is a critical condition involving reduced blood flow to the brain.
- Leukocyte adhesion to microvessel walls is a known phenomenon during ischemia.
- The relationship between blood leukocyte levels and adhesion during ischemia requires further clarification.
Purpose:
- To investigate the dynamic changes in blood leukocyte count and leukocyte adhesion to brain venule walls during developing ischemia.
- To determine if increased leukocyte count in the blood directly correlates with increased adhesion during brain ischemia.
- To explore the implications of leukocyte adhesion on microcirculation and organism survival during severe brain ischemia.
Summary:
- Following bilateral carotid artery ligation in rats, blood leukocyte numbers rapidly increased twofold within 2 hours, while adhesion remained low.
- By 5 hours, blood leukocyte counts returned to baseline, but adhered leukocytes increased over 2.5-fold, suggesting adhesion is independent of blood levels.
- A decrease in blood leukocytes during later stages of ischemia correlated with increased leukocyte adhesion, indicating a potential marker for disease severity.
Impact:
- Findings suggest that reduced blood leukocyte counts in severe brain ischemia may signify increased leukocyte adhesion.
- Increased leukocyte adhesion likely exacerbates microcirculatory disturbances, contributing to tissue damage and potentially organism demise.
- This research highlights leukocyte adhesion as a critical factor in ischemic brain injury progression and offers insights into therapeutic targets.
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