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Sustained astrocytic clusterin expression improves remodeling after brain ischemia.
Anouk Imhof1, Yves Charnay, Philippe G Vallet
1Department of Psychiatry, HUG, Belle-Idée, 2, ch. du Petit-Bel-Air, 1225 Chêne-Bourg Geneva Switzerland.
Neurobiology of Disease
|February 14, 2006
Summary
Clusterin, a glycoprotein, is crucial for brain repair after stroke. Its absence in clusterin-deficient mice led to poorer structural recovery and more reactive astrocytes post-stroke.
Area of Science:
- Neuroscience
- Biochemistry
- Pathology
Background:
- Clusterin is a glycoprotein upregulated following tissue injury.
- Its precise role in the chronic phase of ischemic brain damage remains unclear.
Purpose of the Study:
- To investigate the role of clusterin in the post-ischemic remodeling phase after stroke.
- To determine clusterin's function in the chronic phase of ischemic brain damage.
Main Methods:
- Utilized clusterin-deficient (Clu-/-) and wild-type (WT) mice.
- Induced permanent middle cerebral artery occlusion (MCAO) to model ischemic stroke.
- Analyzed clusterin mRNA and protein expression via RT-PCR and Western blot.
- Assessed structural restoration and glial scar formation using immunohistochemistry for GFAP.
Main Results:
- Clusterin mRNA levels increased in WT mice from 14 to 90 days post-MCAO, particularly around the infarct area and in astrocytes.
- Clusterin protein expression also rose in the ischemic hemisphere of WT mice, peaking at 30 days post-MCAO.
- Clu-/- mice exhibited impaired structural recovery and a greater number of GFAP-reactive astrocytes near the infarct scar compared to WT mice.
Conclusions:
- Clusterin plays a significant role in the structural remodeling and repair processes following ischemic stroke.
- These findings extend previous knowledge by highlighting clusterin's importance in the chronic phase of stroke recovery, beyond early neuroprotection.