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J Cereb Blood Flow Metab. 2018 Jan;38(1):58-74. doi: 10.1177/0271678X17705973. Epub 2017 May 17.

mTOR drives cerebral blood flow and memory deficits in LDLR-/- mice modeling atherosclerosis and vascular cognitive impairment.

Author information

1
1 Department of Cellular and Integrative Physiology and The Barshop Institute for Longevity and Aging Studies, University of Texas Health Science Center at San Antonio, TX, USA.
2
2 Sanders-Brown Center on Aging, Department of Pharmacology and Nutritional Sciences and Department of Biomedical Engineering, University of Kentucky, KY, USA.
3
3 Department of Pharmacology, University of Texas Health Science Center at San Antonio, TX, USA.
4
4 Department of Psychiatry, University of Texas Health Science Center at San Antonio, TX, USA.
5
5 Department of Medicine, University of Texas Health Science Center at San Antonio, TX, USA.
6
6 Department of Clinical Laboratory Sciences, University of Texas Health Science Center at San Antonio, TX, USA.
7
7 Department of Biochemistry, University of Texas Health Science Center at San Antonio, TX, USA.

Abstract

We recently showed that mTOR attenuation blocks progression and abrogates established cognitive deficits in Alzheimer's disease (AD) mouse models. These outcomes were associated with the restoration of cerebral blood flow (CBF) and brain vascular density (BVD) resulting from relief of mTOR inhibition of NO release. Recent reports suggested a role of mTOR in atherosclerosis. Because mTOR drives aging and vascular dysfunction is a universal feature of aging, we hypothesized that mTOR may contribute to brain vascular and cognitive dysfunction associated with atherosclerosis. We measured CBF, BVD, cognitive function, markers of inflammation, and parameters of cardiovascular disease in LDLR-/- mice fed maintenance or high-fat diet ± rapamycin. Cardiovascular pathologies were proportional to severity of brain vascular dysfunction. Aortic atheromas were reduced, CBF and BVD were restored, and cognitive dysfunction was attenuated potentially through reduction in systemic and brain inflammation following chronic mTOR attenuation. Our studies suggest that mTOR regulates vascular integrity and function and that mTOR attenuation may restore neurovascular function and cardiovascular health. Together with our previous studies in AD models, our data suggest mTOR-driven vascular damage may be a mechanism shared by age-associated neurological diseases. Therefore, mTOR attenuation may have promise for treatment of cognitive impairment in atherosclerosis.

KEYWORDS:

Atherosclerosis; cerebral blood flow; cognition; inflammation; vascular biology

PMID:
28511572
PMCID:
PMC5757441
DOI:
10.1177/0271678X17705973
[Indexed for MEDLINE]
Free PMC Article

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