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Related Experiment Videos

Inflammation and intracranial aneurysms.

D Chyatte1, G Bruno, S Desai

  • 1Cerebrovascular Research Laboratory, Lerner Research Institute, The Cleveland Clinic Foundation 44195, Ohio, USA.

Neurosurgery
|November 5, 1999
PubMed
Summary
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Inflammation and immune responses are prevalent in intracranial aneurysms, potentially contributing to their development and rupture. This study investigated these reactions in aneurysm tissue compared to healthy arteries.

Area of Science:

  • Cerebrovascular disease research
  • Immunology of vascular disorders
  • Pathophysiology of aneurysms

Background:

  • Intracranial aneurysms are a significant cause of cerebrovascular disease, often leading to severe subarachnoid hemorrhage.
  • Understanding the underlying biology of cerebral aneurysms is crucial for developing improved treatment strategies.
  • Current therapies have limited success in preventing death or disability post-hemorrhage.

Purpose of the Study:

  • To investigate the presence and extent of inflammatory and immunological reactions within intracranial aneurysm tissue.
  • To compare the cellular and molecular markers of inflammation in aneurysms versus normal basilar arteries.

Main Methods:

  • Aneurysm tissue samples were obtained from 25 patients undergoing microsurgical repair (23 unruptured, 2 ruptured).

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  • Control tissue comprised 11 basilar arteries from autopsies.
  • Immunohistochemistry was employed to detect complement components (C3c, C9), immunoglobulins (IgG, IgM), adhesion molecules (VCAM-1), and immune cells (macrophages, T and B lymphocytes).

    • Main Results:

    • Significant presence of complement (C3c, C9), immunoglobulins (IgG, IgM), VCAM-1, macrophages (CD68), and T lymphocytes (CD3) was observed in aneurysm walls (P < 0.0001 to P = 0.004).
    • These markers were rarely detected in control basilar arteries.
    • B lymphocytes (CD20) were found infrequently in aneurysms and not in controls.

    Conclusions:

    • Intracranial aneurysms exhibit extensive inflammatory and immunological activity, even in unruptured cases.
    • These immune and inflammatory processes may play a role in the formation and subsequent rupture of cerebral aneurysms.
    • Further research into these mechanisms could inform novel therapeutic approaches.