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Related Experiment Videos

Early pathophysiological changes in cerebral vessels predisposing to stroke.

Volodymyr Gerzanich1, Svetlana Ivanova, J Marc Simard

  • 1Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA.

Clinical Hemorheology and Microcirculation
|January 16, 2004
PubMed
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Abnormal L-type calcium channel activity drives vascular smooth muscle proliferation in stroke models. Blocking these channels or CaM kinase II prevents abnormal cell growth, highlighting a key mechanism in cerebral arteriolar injury.

Area of Science:

  • Neuroscience
  • Cardiovascular Biology
  • Cellular Physiology

Background:

  • Cerebral arterioles are crucial for regulating blood flow to the brain.
  • Endothelial dysfunction and vascular smooth muscle cell proliferation contribute to stroke pathophysiology.
  • L-type calcium channels play a significant role in vascular tone and cell growth.

Purpose of the Study:

  • To investigate the early pathophysiological changes in rat lenticulostriate arterioles under conditions mimicking human stroke.
  • To determine the role of L-type calcium channels and associated signaling pathways in endothelial dysfunction and arteriolar injury.
  • To explore potential therapeutic targets for preventing abnormal vascular smooth muscle proliferation in stroke.

Main Methods:

  • Utilized three rat models: chronic angiotensin II-hypertension, chronic nicotine administration, and oxidative endothelial injury.

Related Experiment Videos

  • Performed quantitative patch clamp analysis on isolated vascular smooth muscle cells.
  • Assessed endothelial nitric oxide synthase (eNOS) localization and activity, oxidative stress markers (superoxide dismutase, hexose kinase), and cell proliferation markers (PCNA, phospho-CREB).
  • Investigated the effects of L-type calcium channel blockers (amlodipine) and CaM kinase II inhibitors (KN-93).

    • Main Results:

    • All three models exhibited increased L-type calcium channel activity in vascular smooth muscle cells, primarily due to increased open channel probability.
    • Endothelial dysfunction varied across models, including eNOS mislocalization in hypertension and oxidative stress in nicotine and injury models.
    • Significant upregulation of proliferative cell nuclear antigen (PCNA) and activation of phospho-CREB and CaM kinase II were observed in all models.
    • Pharmacological blockade of L-type calcium channels or CaM kinase II completely inhibited CREB activation and PCNA upregulation.

    Conclusions:

    • Abnormal regulation of L-type calcium channels is a direct cause of aberrant proliferative responses in vascular smooth muscle cells during cerebral arteriolar injury.
    • Endothelial dysfunction, while varied in nature, is consistently associated with these proliferative changes.
    • Targeting L-type calcium channels or CaM kinase II represents a promising therapeutic strategy for mitigating stroke-related arteriolar damage.