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Endothelial Dysfunction and Amyloid-β-Induced Neurovascular Alterations

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Abstract

Alzheimer’s disease (AD) and cerebrovascular diseases share common vascular risk factors that have disastrous effects on cerebrovascular regulation. Endothelial cells, lining inner walls of cerebral blood vessels, form a dynamic interface between the blood and the brain and are critical for the maintenance of neurovascular homeostasis. Accordingly, injury in endothelial cells is regarded as one of the earliest symptoms of impaired vasoregulatory mechanisms. Extracellular buildup of amyloid-β (Aβ) is a central pathogenic factor in AD. Aβ exerts potent detrimental effects on cerebral blood vessels and impairs endothelial structure and function. Recent evidence implicates vascular oxidative stress and activation of the non-selective cationic channel transient receptor potential melastatin (TRPM)-2 on endothelial cells in the mechanisms of Aβ-induced neurovascular dysfunction. Thus, Aβ triggers opening of TRPM2 channels in endothelial cells leading to intracellular Ca2+ overload and vasomotor dysfunction. The cerebrovascular dysfunction may contribute to AD pathogenesis by reducing the cerebral blood supply, leading to increased susceptibility to vascular insufficiency, and by promoting Aβ accumulation. The recent realization that vascular factors contribute to AD pathobiology suggests new targets for the prevention and treatment of this devastating disease.

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Abbreviations

ACA:

TRPM2 inhibitor

AD:

Alzheimer’s disease

ADPR:

ADP-ribose

2-APB:

TRPM2 inhibitor

Aβ:

β-amyloid

APP:

Amyloid precursor protein

BBB:

Blood–brain barrier

CAA:

Cerebral amyloid angiopathy

CBF:

Cerebral blood flow

CD36:

Cluster of differentiation 36

CNS:

Central nervous system

CSF:

Cerebrospinal fluid

DNA:

Deoxyribonucleic acid

γH2AX:

Phosphorylated histone H2AX

GTP:

Guanosine triphosphate

Mfsd2a:

Major facilitator superfamily domain containing 2a

NADPH:

Nicotinamide adenine dinucleotide phosphate

NO:

Nitric oxide

Nox:

NADPH oxidase

PARG:

Poly(ADP-ribose) glycohydrolase

PARP:

Poly(ADP-ribose) polymerase

PICALM:

Phosphatidylcholine-binding clathrin assembly protein

PJ34:

PARP inhibitor

phox:

Phagocytic oxidase

Rac:

Ras-related C3 botulinum toxin substrate

RAGE:

Receptor for advanced glycogen end-products

ROS:

Reactive oxygen species

siRNA:

Small interfering RNA

SLC2A1:

Solute carrier family 2 (Facilitated Glucose Transporter), Member 1

SOD:

Superoxide dismutase

TRPM2:

Transient receptor potential melastatin 2

VEGF:

Vascular endothelial growth factor

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Acknowledgments

The authors thank Dr. Costantino Iadecola for critical reading of the manuscript. This work was supported by the National Institutes of Health Grant NS37853, and by the American Heart Association Grant 09SDG2060701. The generous support of the Feil Family Foundation is gratefully acknowledged.

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Correspondence to Laibaik Park.

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Koizumi, K., Wang, G. & Park, L. Endothelial Dysfunction and Amyloid-β-Induced Neurovascular Alterations. Cell Mol Neurobiol 36, 155–165 (2016). https://doi.org/10.1007/s10571-015-0256-9

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  • DOI: https://doi.org/10.1007/s10571-015-0256-9

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