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Moderate cerebral venous congestion induces rapid cerebral protection via adenosine A1 receptor activation

Keiichi Akaiwa1, Hidetoshi Akashi, Hideki Harada

  • 1Department of Surgery, Kurume University School of Medicine, Kurume, Japan.

Brain Research
|October 28, 2006
PubMed

Insights

Cerebral venous congestion (VC) before stroke significantly reduced brain infarct size and neurological deficits in rats. Mild VC provided neuroprotection, while severe VC increased mortality, suggesting a therapeutic window for adenosine A1 receptor activation.

Area of Science:

  • Neuroscience
  • Cardiovascular Surgery
  • Cerebrovascular Research

Background:

  • Stroke is a major complication in cardiovascular surgery, often exacerbated by increased intracranial pressure due to cerebral venous circulatory disturbances (CVCD).
  • Previous research indicated that inducing CVCD before cerebral ischemia could decrease infarct area.

Purpose of the Study:

  • To investigate the neuroprotective effects of pre-ischemic cerebral venous congestion (VC) in a rat model of focal cerebral ischemia.
  • To evaluate the role of adenosine A1 receptor activation in mediating this protective effect.

Main Methods:

  • Focal cerebral ischemia was induced in spontaneously hypertensive rats using filament insertion.
  • Rats were assigned to sham-operated, mild VC, severe VC, or DPCPX (adenosine A1 receptor antagonist) groups.
  • Evaluated infarct volume, cerebral edema, S-100 protein levels, and behavioral deficits.

Main Results:

  • Mild and severe VC groups exhibited significantly reduced infarct volumes compared to sham and DPCPX groups.
  • Mild VC significantly decreased edema and neurological deficits compared to other groups.
  • Severe VC led to a time-dependent increase in mortality.
  • DPCPX administration abolished the protective effects of mild VC.

Conclusions:

  • Appropriate pre-ischemic cerebral venous congestion can rapidly induce cerebral protection, likely mediated by adenosine A1 receptor activation.
  • Mild VC demonstrates neuroprotective potential, reducing infarct size, edema, and neurological deficits.
  • The findings suggest a potential therapeutic strategy for stroke prevention or treatment by modulating cerebral venous pressure.

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