Abstract
The ε4 allele of the apolipoprotein E gene (APOE4) is associated with cognitive decline during aging, is the greatest genetic risk factor for Alzheimer’s disease and has links to other neurodegenerative conditions that affect cognition. Increasing evidence indicates that APOE genotypes differentially modulate the function of the cerebrovasculature (CV), with apoE and its receptors expressed by different cell types at the CV interface (astrocytes, pericytes, smooth muscle cells, brain endothelial cells). However, research on the role of apoE in CV dysfunction has not advanced as quickly as other apoE-modulated pathways. This review will assess what aspects of the CV are modulated by APOE genotypes during aging and under disease states, discuss potential mechanisms, and summarize the therapeutic significance of the topic. We propose that APOE4 induces CV dysfunction through direct signaling at the CV, and indirectly via modulation of peripheral and central pathways. Further, that APOE4 predisposes the CV to damage by, and exacerbates the effects of, additional risk factors (such as sex, hypertension, and diabetes). ApoE4-induced detrimental CV changes include reduced cerebral blood flow (CBF), modified neuron-CBF coupling, increased blood–brain barrier leakiness, cerebral amyloid angiopathy, hemorrhages and disrupted transport of nutrients and toxins. The apoE4-induced detrimental changes may be linked to pericyte migration/activation, astrocyte activation, smooth muscle cell damage, basement membrane degradation and alterations in brain endothelial cells.
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Abbreviations
- Aβ:
-
Amyloid-β
- AD:
-
Alzheimer’s disease
- apoE:
-
Apolipoprotein E
- APOE-TR:
-
APOE-targeted replacement mice
- ASL:
-
Arterial spin labeling
- BBB:
-
Blood–brain barrier
- BEC:
-
Brain endothelial cells
- CAA:
-
Cerebral amyloid angiopathy
- CBF:
-
Cerebral blood flow
- CSF:
-
Cerebrospinal spinal fluid
- CNS:
-
Central nervous system
- CV:
-
Cerebrovasculature
- cypA:
-
Cyclophilin A
- FAD:
-
Familial AD
- ISF:
-
Interstitial fluid
- KO:
-
Knockout
- LDLR:
-
Low-density lipoprotein receptor
- LRP1:
-
Low-density lipoprotein receptor-related protein 1
- MCI:
-
Mild cognitive impairment
- MMP:
-
Matrix metalloproteinase
- MS:
-
Multiple sclerosis
- NVU:
-
Neurovascular unit
- oAβ:
-
Oligomeric Aβ
- TJ:
-
Tight junction
- TNFα:
-
Tumor necrosis factor α
- VaD:
-
Vascular dementia
- VLDLR:
-
Very LDL receptor
- WMH:
-
White matter hyperintensities
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Acknowledgments
L. M. T. is supported by UIC start-up funds. G. B. is supported by National Institutes of Health Grants RF1AG051504, R01AG027924, R01AG035355, R01AG046205, P01AG030128, P01NS074969, and P50AG016574, and grants from the Alzheimer’s Association and Cure Alzheimer’s Fund. The authors would also like to acknowledge Dr. Scott Brady (UIC) for critical scientific discussions on the topic.
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Tai, L.M., Thomas, R., Marottoli, F.M. et al. The role of APOE in cerebrovascular dysfunction. Acta Neuropathol 131, 709–723 (2016). https://doi.org/10.1007/s00401-016-1547-z
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DOI: https://doi.org/10.1007/s00401-016-1547-z