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MRI predicts area of increased plasminogen activation in permanent focal cerebral ischemia

Thomas Pfefferkorn1, Christoph Wiessner, Peter R Allegrini

  • 1Department of Neurology, Klinikum Grosshadern, Ludwig-Maximilians-Universität München, Marchioninistrasse 15, 81377 München, Germany.

Neurological Research
|December 26, 2002
PubMed

Insights

Magnetic Resonance Imaging (MRI) can predict the extent of intracerebral plasminogen activation following focal cerebral ischemia (FCI) in rats. This finding is crucial for understanding post-ischemic brain edema and hemorrhage.

Area of Science:

  • Neuroimaging
  • Cerebrovascular Research
  • Biochemistry

Background:

  • Focal cerebral ischemia (FCI) triggers complex molecular events, including plasminogen activation.
  • The role of plasminogen activation in blood-brain barrier (BBB) disruption, edema, and hemorrhage post-ischemia requires further elucidation.
  • Non-invasive imaging techniques for assessing these molecular changes are highly desirable.

Purpose of the Study:

  • To investigate the predictive capability of Magnetic Resonance Imaging (MRI) for intracerebral plasminogen activation after experimental focal cerebral ischemia.
  • To correlate MRI-detected ischemic regions with histological evidence of enhanced plasminogen activation.

Main Methods:

  • Permanent focal cerebral ischemia (FCI) was induced in a rat model.
  • Ischemic regions were identified using MRI at 48 hours post-ischemia.
  • Plasminogen activation was quantified using histological zymography at 72 hours post-ischemia.
  • Comparative analysis of MRI-defined areas and zymography-defined areas was performed.

Main Results:

  • A significant overlap was observed between MRI-detected ischemic alterations and areas of increased plasminogen activation.
  • The overlap was statistically significant for the entire hemisphere (p < 0.001), cortex (p < 0.05), and basal ganglia (p < 0.05).
  • MRI alterations covered 64.5% +/- 5.4% and plasminogen activation 62.2% +/- 3.6% of the ischemic hemisphere.

Conclusions:

  • MRI is a reliable method for predicting the extent of increased intracerebral plasminogen activation following focal cerebral ischemia.
  • Predicting plasminogen activation via MRI may offer insights into the mechanisms of BBB-mediated post-ischemic brain edema and secondary hemorrhage.
  • This correlation highlights the potential of MRI in evaluating critical molecular events in ischemic stroke.

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