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Endothelin-1 Induced Middle Cerebral Artery Occlusion Model for Ischemic Stroke with Laser Doppler Flowmetry Guidance in Rat
Authors:Saeed Ansari  Hassan Azari  Kenneth J. Caldwell  Robert W. Regenhardt  Vishnumurthy S. Hedna  Micheal F. Waters  Brian L. Hoh  Adam P. Mecca
Affiliation:Department of Neurosurgery, University of Florida;Department of Anatomical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran;Department of Physiology and Functional Genomics, University of Florida;Department of Neurology, University of Florida
Abstract:
Stroke is the number one cause of disability and third leading cause of death in the world, costing an estimated $70 billion in the United States in 20091, 2. Several models of cerebral ischemia have been developed to mimic the human condition of stroke. It has been suggested that up to 80% of all strokes result from ischemic damage in the middle cerebral artery (MCA) area3. In the early 1990s, endothelin-1 (ET-1) 4 was used to induce ischemia by applying it directly adjacent to the surface of the MCA after craniotomy. Later, this model was modified 5 by using a stereotaxic injection of ET-1 adjacent to the MCA to produce focal cerebral ischemia. The main advantages of this model include the ability to perform the procedure quickly, the ability to control artery constriction by altering the dose of ET-1 delivered, no need to manipulate the extracranial vessels supplying blood to the brain as well as gradual reperfusion rates that more closely mimics the reperfusion in humans5-7. On the other hand, the ET-1 model has disadvantages that include the need for a craniotomy, as well as higher variability in stroke volume8. This variability can be reduced with the use of laser Doppler flowmetry (LDF) to verify cerebral ischemia during ET-1 infusion. Factors that affect stroke variability include precision of infusion and the batch of the ET-1 used6. Another important consideration is that although reperfusion is a common occurrence in human stroke, the duration of occlusion for ET-1 induced MCAO may not closely mimic that of human stroke where many patients have partial reperfusion over a period of hours to days following occlusion9, 10. This protocol will describe in detail the ET-1 induced MCAO model for ischemic stroke in rats. It will also draw attention to special considerations and potential drawbacks throughout the procedure.
Keywords:Medicine   Issue 72   Neuroscience   Neurobiology   Biomedical Engineering   Surgery   Anatomy   Physiology   Nervous System Diseases   Ischemic stroke   Endothelin-1   Cerebrovascular   brain   artery   stroke   occlusion   laser   doppley   flowmetry   rat   animal model
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