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A Mouse Model Characterizing Features of Vascular Dementia With Hippocampal Atrophy

Lookup NU author(s): Professor Raj KalariaORCiD

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Abstract

Background and Purpose-We have previously described effects of chronic cerebral hypoperfusion in mice with bilateral common carotid artery stenosis (BCAS) using microcoils for 30 days. These mice specifically exhibit working memory deficits attributable to frontal-subcortical circuit damage without apparent gray matter changes, indicating similarities with subcortical ischemic vascular dementia. However, as subcortical ischemic vascular dementia progresses over time, the longer-term effects that characterize the mouse model are not known. Methods-Comprehensive behavioral test batteries and histological examinations were performed in mice subjected to BCAS for up to 8 months. Laser speckle flowmetry and F-18-fluorodeoxyglucose positron emission tomography were performed to assess cerebral blood flow and metabolism at several time points. Results-At 2 hours after BCAS, cerebral blood flow in the cerebral cortex temporarily decreased to as much as 60% to 70% of the control value but gradually recovered to >80% at 1 to 3 months. At 5 to 6 months after BCAS, reference and working memory were impaired as demonstrated by the Barnes and radial arm maze tests, respectively. Furthermore, F-18-fluorodeoxyglucose positron emission tomography demonstrated that hippocampal glucose utilization was impaired at 6 months after BCAS. Consistent with these behavioral and metabolic abnormalities, histological analyses demonstrated hippocampal atrophy with pyknotic and apoptotic cells at 8 months after BCAS. Conclusions-These results suggest that the longer-term BCAS model replicates advanced stages of subcortical ischemic vascular dementia when hippocampal neuronal loss becomes significant. (Stroke. 2010; 41: 1278-1284.)

Publication metadata

Author(s): Nishio K, Ihara M, Yamasaki N, Kalaria RN, Maki T, Fujita Y, Ito H, Oishi N, Fukuyama H, Miyakawa T, Takahashi R, Tomimoto H

Publication type: Article

Publication status: Published

Journal: Stroke

Year: 2010

Volume: 41

Issue: 6

Pages: 1278-1284

Print publication date: 01/06/2010

ISSN (print): 0039-2499

ISSN (electronic): 1524-4628

Publisher: Lippincott Williams & Wilkins

URL: http://dx.doi.org/10.1161/STROKEAHA.110.581686

DOI: 10.1161/STROKEAHA.110.581686

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