Multi-modal characterisation of the neocortical clip model of focal cerebral ischaemia by MRI, behaviour and immunohistochemistry
| Autor: | John S. Beech, Maria Ashioti, Andrew S. Lowe, Michael Modo, Steve C.R. Williams, Mayke B. Hesselink |
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| Rok vydání: | 2007 |
| Předmět: |
Middle Cerebral Artery
Pathology medicine.medical_specialty Ischemia Neocortex Nerve Tissue Proteins Brain Ischemia Lesion Central nervous system disease Neuroimaging Predictive Value of Tests Rats Inbred SHR Glial Fibrillary Acidic Protein Occlusion medicine Animals Gliosis Molecular Biology Stroke Neurologic Examination Behavior Animal business.industry General Neuroscience Nuclear Proteins Infarction Middle Cerebral Artery Surgical Instruments medicine.disease Immunohistochemistry Magnetic Resonance Imaging Rats Astrogliosis DNA-Binding Proteins Chemotaxis Leukocyte Disease Models Animal medicine.anatomical_structure Cerebral cortex Nerve Degeneration Disease Progression Neurology (clinical) medicine.symptom business Biomarkers Developmental Biology |
| Zdroj: | Brain Research. 1145:177-189 |
| ISSN: | 0006-8993 |
| Popis: | The neocortical clip model of focal cerebral ischaemia has previously been used with success in neuroprotection studies. To further improve its translational qualities, we have characterised this model using a combination of serial Magnetic Resonance Imaging (MRI), neurological assessment, the bilateral asymmetry test (BAT) and immunohistochemistry. The right MCA was occluded in spontaneously hypertensive rats for 0, 60 and 120 min. MRI was performed pre-surgery, 1, 3 and 7 days post-surgery. Behavioural assessment was performed 2 days before and 3 and 7 days post-surgery whilst neurological deficits were monitored daily. Neuroimaging results showed that 0 min of MCA occlusion did not produce a lesion, whereas occlusion for 60 min produced a lesion that remained stable over time. Occlusion for 120 min caused a more severe lesion 1 day post-surgery, but decreased by 7 days. Behaviour, neurological scores and histological lesion volumes correlated strongly with MRI lesion volume. Immunohistochemistry revealed neuronal loss, astrogliosis and macrophage infiltration in lesioned cortices. The neocortical clip model produced ischaemic lesions that are restricted to cortical territories of the MCA. The duration of occlusion dictates lesion severity which may prove useful for probing therapeutic interventions at different stages of stroke progression. The correlation of MRI with two different behavioural measures and post-mortem histology strengthens the basis for MRI providing an in vivo surrogate marker for structural and behavioural deficits caused by a cortical stroke. |
| Databáze: | OpenAIRE |
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