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A Rat Model of Middle Cerebral Artery Occlusion/Reperfusion Without Damaging the Anatomical Structure of Cerebral Vessels
Published on: May 17, 2024
Middle cerebral artery alterations in a rat chronic hypoperfusion model
Ana Márquez-Martín1, Francesc Jiménez-Altayó, Ana P Dantas
1Departament de Farmacologia, Terapèutica i Toxicologia, Institut de Neurociències, Facultat de Medicina, Universitat Autònoma de Barcelona, Bellaterra, Spain.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 19, 2011
Summary
Chronic cerebral hypoperfusion (CHP) reduced collagen in brain arteries, increasing wall stress and diminishing myogenic tone. This remodeling may contribute to cognitive decline in aging brains.
Area of Science:
- Neuroscience
- Vascular Biology
- Biochemistry
Background:
- Chronic cerebral hypoperfusion (CHP) is linked to vascular cognitive impairment and dementia.
- Microvascular changes in the aging brain may exacerbate cognitive decline.
Purpose of the Study:
- To investigate the effects of CHP on the middle cerebral artery (MCA) in rats.
- To analyze structural, mechanical, and myogenic properties following bilateral common carotid artery occlusion (BCCAO).
Main Methods:
- Adult male Wistar rats underwent BCCAO or sham surgery.
- MCA and carotid artery (CA) properties were assessed using pressure myography.
- Collagen, MMPs, and HIF-1α expression were analyzed via immunofluorescence, Western blot, and qPCR.
Main Results:
- BCCAO reduced MCA cross-sectional area, wall thickness, and wall-to-lumen ratio.
- Wall stress increased, while stiffness remained unchanged; myogenic response diminished.
- CHP induced HIF-1α expression and decreased Collagen I/III, correlated with increased MMP-1 and MMP-9.
Conclusions:
- BCCAO induces hypotrophic remodeling in brain arteries.
- Reduced collagen, elevated MMPs, and diminished myogenic tone may contribute to cognitive impairment.
