Cited by 1,857Neurological Disease Mechanisms and TreatmentsDementia and Cognitive Impairment ResearchCerebrovascular and genetic disorders

The Pathobiology of Vascular Dementia

Open access
Iadecola, Costantino·2013·Neuron

Abstract

Vascular cognitive impairment defines alterations in cognition, ranging from subtle deficits to full-blown dementia, attributable to cerebrovascular causes. Often coexisting with Alzheimer's disease, mixed vascular and neurodegenerative dementia has emerged as the leading cause of age-related cognitive impairment. Central to the disease mechanism is the crucial role that cerebral blood vessels play in brain health, not only for the delivery of oxygen and nutrients, but also for the trophic signaling that inextricably links the well-being of neurons and glia to that of cerebrovascular cells. This review will examine how vascular damage disrupts these vital homeostatic interactions, focusing on the hemispheric white matter, a region at heightened risk for vascular damage, and on the interplay between vascular factors and Alzheimer's disease. Finally, preventative and therapeutic prospects will be examined, highlighting the importance of midlife vascular risk factor control in the prevention of late-life dementia.

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Crossref · 10.1016/j.neuron.2013.10.008

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Claims the paper makes

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  • Premisecitation

    Most dementia cases show mixed pathology, combining Alzheimer's features and ischemic lesions.

    “community based clinical-pathological studies revealed that the largest proportion of dementia cases have mixed pathology, comprising features of AD (amyloid plaques and neurofibrillary tangles) as well as ischemic lesions (Launer et al., 2008; Schneider et al., 2009).”
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    The brain needs a continuous, well-regulated blood supply because it has high energy demands and no fuel reserves.

    “Owing to its high energy needs and lack of fuel reserves, the brain requires a continuous and well-regulated supply of blood (Iadecola, 2004).”
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    Neurons, glia, and vascular cells exhibit a functional and pathogenic synergy.

    “new experimental findings have revealed a previously unrecognized functional and pathogenic synergy between neurons, glia and vascular cells (Iadecola, 2010; Quaegebeur et al., 2011; Zlokovic, 2011)”
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  • Interpretationreasoning

    Neural activity is the main factor determining dynamic regulation of cerebral blood flow.

    “Consequently, neural activity, which uses most of the brain’s energy budget, is the major determinant of the dynamic regulation of CBF.”
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  • Interpretationnone given

    Cerebral blood vessels play a crucial role in brain health, including trophic signaling linking neurons and glia to cerebrovascular cells.

    “Central to the disease mechanism is the crucial role that cerebral blood vessels play in brain health, not only for the delivery of oxygen and nutrients, but also for the trophic signaling that links inextricably the well being of neurons and glia to that of cerebrovascular cells.”
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    Interpretationreasoning

    The neurovascular unit acts as an important checkpoint that regulates the afferent and efferent arms of the immune system and shapes brain immune responses.

    “Therefore, the neurovascular unit is an important checkpoint regulating the afferent and efferent arms of the immune system and shaping the immune responses of the brain.”
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    Premisecitation

    Cerebrovascular disease is a primary cause of cognitive impairment and also amplifies dementia caused by other factors, including Alzheimer's disease.

    “Recent clinical-pathological studies have highlighted the role of cerebrovascular disease, not only as a primary cause of cognitive impairment, but also as an adjuvant to the expression of dementia caused by other factors, including AD and other neurodegenerative pathologies (Gorelick et al., 2011; Schneider et al., 2007a; Toledo et al., 2013).”
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    Premisecitation

    Occlusion of penetrating arterioles or venules cannot be compensated by anastomotic branches and produces small ischemic lesions resembling microinfarcts.

    “occlusion of penetrating arterioles or venules, unlike pial vessels, cannot be effectively compensated by anastomotic branches (Blinder et al., 2013), and results in reductions in flow sufficient to produce small ischemic lesions akin to microinfarcts (Nguyen et al., 2011; Nishimura et al., 2010; Shih et al., 2013).”
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    Premisecitation

    Deep white matter is supplied by long penetrating arterioles at border zones between vascular territories and is more vulnerable to reduced blood flow.

    “regions of the deep white matter are supplied by long penetrating arterioles arising from the pial cortical network at the border between non-overlapping vascular territories of the anterior and middle cerebral arteries, and as such are more vulnerable to reductions in blood flow (Brown and Thore, 2011; De Reuck, 1971)”
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    Premisecitation

    White matter uses one-third less energy and receives one-third less blood flow than gray matter.

    “Due to fewer synapses, white matter energy usage, and consequently blood flow, is 1/3 lower of that of the gray matter (Harris and Attwell, 2012).”
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    Premisecitation

    Vascular dementia accounts for at least 20% of dementia cases and is second only to Alzheimer's disease.

    “Vascular dementia, a heterogeneous group of brain disorders in which cognitive impairment is attributable to cerebrovascular pathologies, is responsible for at least 20% of cases of dementia, being second only to Alzheimer’s disease (AD) (Gorelick et al., 2011).”
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    Interpretationreasoning

    Neurovascular cells are trophically and metabolically interdependent, so damage to one cell type removes vital support and harms other cell types.

    “Therefore, neurovascular cells are trophically and metabolically interdependent, such that damage to one cell type removes a vital source of support to the whole unit and has deleterious consequences also for the other cell types.”
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    Premisecitation

    The neurovascular unit is a functional domain formed by the close developmental, structural, and functional ties between brain vessels and brain tissue.

    “The brain vasculature has an intimate developmental, structural and functional relationship with the brain tissue, their cellular elements forming a functional domain termed the neurovascular unit (Iadecola, 2004).”
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    Premisecitation

    Stroke doubles the risk of dementia, and about 30% of stroke patients develop cognitive dysfunction within 3 years.

    “Stroke doubles the risk for dementia (post-stroke dementia), and approximately 30% of stroke patients go on to develop cognitive dysfunction within 3 years (Allan et al., 2011; Leys et al., 2005; Pendlebury and Rothwell, 2009).”
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    Premisecitation

    ApoE4 is a well-established susceptibility gene for increased cardiovascular risk and Alzheimer disease.

    “The ApoE 4 allele is a well-established susceptibility gene for increased cardiovascular risk and Alzheimer disease (Verghese et al., 2011).”
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    ApoE4 is associated with increased cerebral amyloid angiopathy risk, while ApoE2 and ApoE4 increase the risk of lobar hemorrhages.

    “The ApoE4 allele is associated with increased risk of CAA, whereas both ApoE2 and 4 increase the risk of lobar hemorrhages (Charidimou et al., 2012).”
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    CADASIL is the most common hereditary vascular cognitive impairment syndrome and is caused by a Notch-3 frameshift mutation that creates or removes a cysteine residue.

    “The most common of these is the CADASIL syndrome caused by a frame shift mutation of Notch-3 that either creates or eliminates a cystein residue (Chabriat et al., 2009).”
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    Advanced age is a strong risk factor for vascular cognitive impairment, and the prevalence and incidence of cognitive impairment rise steeply after age 65.

    “Advanced age is a powerful risk factor for VCI, and the prevalence and incidence of cognitive impairment increases exponentially after age 65 (Gorelick et al., 2011).”
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    Premisecitation

    Reductions in CBF of 40-50% are linked to suppressed brain activity and cognitive dysfunction, which reverse when normal CBF is restored.

    “Reductions in CBF by 40–50% are associated with suppression of brain activity and cognitive dysfunction, which are reversible upon re-establishing normal CBF levels (Marshall et al., 1999; Marshall, 2012; Tatemichi et al., 1995).”
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    Premisecitation

    White matter lesions are associated with reduced frontal lobe glucose use, lower global cortical blood flow, disrupted connectivity, and cerebral atrophy.

    “Indeed, white matter lesions affect brain structure and function broadly, and are associated with reductions in frontal lobe glucose utilization (Decarli et al., 1995; Haight et al., 2013; Tullberg et al., 2004), global reduction in cortical blood flow (Appelman et al., 2008; Chen et al., 2013a; Dam et al., 2007; Kobari et al., 1990), disruption of brain connectivity (Lawrence et al., 2013; Sun et”
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    Premisecitation

    Linkage studies in patients with MRI white matter lesions discovered several loci, but no specific gene has been identified and the findings await replication and validation.

    “Linkage studies in patients with white matter lesions on MRI have discovered several loci (Schmidt et al., 2012), but no specific gene has been identified and the findings await replication and validation (Lee and Kim, 2013; Markus, 2008).”
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    Premisecitation

    GWAS of vascular dementia show a small effect of SNPs at the androgen receptor gene locus, a finding not observed in all ethnic groups.

    “GWAS of vascular dementia have shown small effect of SNPs in the androgen receptor gene locus (Schrijvers et al., 2012), a finding not observed in all ethnic groups (Lee and Kim, 2013).”
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    Premisecitation

    Expansion of white matter lesions correlates with cognitive decline, and new lacunes cause a steeper decline, especially in motor speed and executive functions.

    “The expansion of the white matter lesions correlates with the evolution of the cognitive impairment (Maillard et al., 2012), new lacunes causing a steeper decline, especially in motor speed and executive functions (Jokinen et al., 2011).”
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    Interpretationcitation

    Myelin damage could impair neuroplasticity and skilled motor learning and thereby contribute to cognitive impairment.

    “In addition, since myelination of previously naked fibers participates in neuroplasticity and skilled motor learning (Fields, 2010; Richardson et al., 2011), myelin damage could also compromise these important functions and contribute to cognitive impairment.”
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    Premisecitation

    Education level does not affect the rate at which vascular cognitive impairment progresses and loses its impact in advanced disease.

    “However, the education level does not influence the rate of progression of VCI and no longer has an impact in advanced disease (Elbaz et al., 2013; Zieren et al., 2013).”
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    Premisecitation

    Confluent white matter lesions and lacunes occur commonly in VCI and show strong links to cardiovascular risk factors such as hypertension, diabetes, hyperlipidemia, and smoking.

    “Confluent white matter lesions, the imaging correlate of which is termed leukoaraiosis (fig. 3), and lacunes, small (<1.5 cm) white matter infarcts typically in the basal ganglia, are common occurrence in VCI and are strongly associated with cardiovascular risk factors, especially hypertension, diabetes, hyperlipidemia and smoking (Gorelick et al., 2011; Wardlaw et al., 2013b).”
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    Premisecitation

    Resting cerebral blood flow is reduced and vascular reactivity is attenuated in areas of leukoaraiosis.

    “Resting flow is reduced in areas of leukoaraiosis and vascular reactivity attenuated (Kobari et al., 1990; Makedonov et al., 2013; Markus et al., 2000; 1994; Marstrand et al., 2002; O’Sullivan et al., 2002; Yao et al., 1992).”
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    Premisecitation

    Cerebrovascular autoregulation is impaired in vascular cognitive impairment, increasing white matter susceptibility to damage during blood pressure fluctuations.

    “Cerebrovascular autoregulation is impaired, increasing the susceptibility of the white matter to damage during fluctuation in blood pressure (Matsushita et al., 1994).”
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    Premisecitation

    Large vessel stiffness and increased pulsatility are associated with reduced white matter cerebral blood flow and strongly predict leukoaraiosis and lacunes, independently of vascular risk factors.

    “Furthermore, stiffness of large vessels and increased pulsatility are associated with reduced white matter CBF and are strong predictors of leukoaraiosis and lacunes (Brisset et al., 2013; Tarumi et al., 2011; Webb et al., 2012), independently of vascular risk factors (Kearney-Schwartz et al., 2009).”
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    Premisecitation

    Deep white matter tracts are especially vulnerable to vascular insufficiency because they lie at distal borders between vascular territories and their vasculature is susceptible to risk factors.

    “Owing to their location at the distal border between different vascular territories (De Reuck, 1971) (fig 4) and to the susceptibility of their vasculature to risk factors (Brown and Thore, 2011), deep white matter tracts are particularly vulnerable to vascular insufficiency.”
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    Interpretationcitation

    Cerebral blood flow alterations occur in normal-appearing white matter, suggesting that flow reduction precedes and may contribute to white matter damage.

    “Interestingly, CBF alterations have also been described in normal appearing white matter (O’Sullivan et al., 2002), suggesting that the flow reduction precedes and, as such, may contribute to the white matter damage.”
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    Premisecitation

    Endothelial progenitor cells are reduced by stroke risk factors and predict cardiovascular morbidity and mortality.

    “EPC are reduced by stroke risk factors (Hill et al., 2003) and predict cardiovascular morbidity and mortality (Werner et al., 2005).”
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    Interpretationreasoning

    Blood-brain barrier disruption may precede white matter injury and contribute to its development.

    “The latter finding suggests that the BBB disruption could precede white matter injury and contribute to its development.”
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    Premisecitation

    Hypoxia-ischemia damages endothelial cells and increases blood-brain barrier leakage in vitro.

    “Hypoxia-ischemia, which has been demonstrated in white matter lesions, is well known to damage endothelial cells leading to increased BBB leakage in vitro (Ahmad et al., 2012).”
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    Premisecitation

    Endothelial progenitor cells are reduced in age-associated white matter lesions, and the reduction correlates with lesion burden.

    “EPC are reduced in age associated white matter lesions, the reduction correlating with lesion burden (Jickling et al., 2009).”
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    Interpretationcitation

    Blood-brain barrier leakiness in white matter occurs in lacunar strokes but not cortical strokes, suggesting a specific association with small vessel disease of the deep white matter.

    “BBB leakiness in white matter was found in lacunar strokes, but not cortical strokes (Wardlaw et al., 2008), raising the possibility of a specific association with small vessel disease of the deep white matter.”
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    Premisecitation

    NADPH oxidase is enriched in cerebral blood vessels and is an important source of vascular oxidative stress in aging, hypertension, hyperlipidemia, and diabetes.

    “NADPH oxidase, a multiunit enzyme particularly enriched in cerebral blood vessels (Miller et al., 2005), has emerges as an important source in vascular oxidative stress in aging, hypertension, hyperlipidemia and diabetes (Faraci, 2011), and inhibition or genetic inactivation of this enzyme has been shown to ameliorate the vascular dysfunction (Drummond et al., 2011).”
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    Premisecitation

    Angiogenic T-cells are reduced in patients with vascular risk factors and in hypertensive patients with small vessel disease.

    “Angiogenic T-cells are reduced in patients with vascular risk factors (Hur et al., 2007; Weil et al., 2011), and in hypertensive patients with small vessels disease (Rouhl et al., 2012b).”
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    Premisecitation

    Endothelial progenitor cell colony-forming units are reduced in Alzheimer disease patients, and the reduction correlates with cognitive impairment severity.

    “Interestingly, EPC colony forming units are also reduced in AD patients, in whom the magnitude of the reduction correlates with the degree of cognitive impairment (Lee et al., 2009).”
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    Premisecitation

    Cerebral hypoperfusion is associated with white matter inflammation and oxidative stress in rodent models, indicating that hypoxia-ischemia is sufficient to trigger these responses.

    “Cerebral hypoperfusion is associated with white matter inflammation and oxidative stress in rodent models (Dong et al., 2011; Huang et al., 2010; Ihara et al., 2001; Juma et al., 2011; Masumura et al., 2001; Reimer et al., 2011; Yoshizaki et al., 2008), indicating that hypoxia-ischemia is sufficient to trigger these responses.”
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    Interpretationreasoning

    Neurovascular dysfunction would worsen cerebral blood flow reduction in critically perfused deep white matter and contribute to white matter damage.

    “Such neurovascular dysfunction would aggravate the CBF reduction in critically perfused deep white matter regions and contribute to the white matter damage.”
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    Premisecitation

    Permeability to MRI tracers is increased in white matter lesions and in normal-appearing white matter.

    “Third, the permeability to MRI tracers is increased in white matter lesions (Hanyu et al., 2002; Taheri et al., 2011; Wardlaw et al., 2009) and in normal appearing white matter (Topakian et al., 2010).”
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    Premisecitation

    In a similar model, blood-brain barrier alteration was due to MMP9 production by oligodendrocyte precursors, which are increased in ischemic white matter injury in rodents and in patients with vascular cognitive impairment.

    “In a similar model, the BBB alteration was found to be due to MMP9 production by oligodendrocyte precursors, which are increased in ischemic white matter injury in rodent models (Seo et al., 2013) and in patients with VCI (Candelario-Jalil et al., 2011).”
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    Interpretationreasoning

    Endothelial dysfunction has two major pathogenic consequences: reduced resting cerebral blood flow in marginally perfused white matter and altered blood-brain barrier permeability.

    “Endothelial dysfunction has two major pathogenic consequences: reductions in resting CBF in the marginally perfused white matter, and alterations in the permeability of the BBB.”
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    Premisecitation

    Oligodendrocyte progenitor cells produce MMP9, which promotes blood-brain barrier breakdown and perpetuates the cytotoxic milieu underlying demyelination.

    “In addition, OPC produce MMP9, which, as seen in the previous sections, promotes BBB breakdown perpetuating the cytotoxic milieu underlying demyelination (Seo et al., 2013).”
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    Premisecitation

    In multiple sclerosis patients, cerebral blood flow is reduced in normal-appearing white matter and in gray matter.

    “However, in MS patients CBF is reduced in the normal appearing white matter (Law et al., 2004), as well as in the gray matter (D’haeseleer et al., 2011).”
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    Interpretationreasoning

    Vascular risk factors may suppress angiogenic T-cell production, reduce endothelial progenitor cell repair potential, and contribute to microvascular degeneration underlying leukoaraiosis and lacunar stroke.

    “These findings, raise the possibility that vascular risk factors suppress the production of angiogenic T-cells, reduce the repair potential of EPC, and contribute to the microvascular degeneration underlying leukoaraiosis and lacunar stroke.”
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    Premisecitation

    In white matter lesions, hyaluronan is degraded by hyaluronidase PH20, and its cleavage products inhibit oligodendrocyte progenitor cell maturation into myelinating oligodendrocytes.

    “In white matter lesions, HA is degraded by the hyaluronidase PH20 and its cleavage products inhibit the maturation of OPC into oligodendrocytes capable of myelination (Preston et al., 2013) (fig. 7).”
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    Interpretationreasoning

    Demyelination exposes axons to cytokines and free radicals in hypoxic white matter, impairing axonal energy production and causing Na+/K+ ATPase failure.

    “In addition, demyelination exposes the axons to the deleterious effects of cytokine and free radicals in the hypoxic white matter, which may impair axonal energy production leading to failure of the Na+/K+ ATPase.”
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    Premisecitation

    Myelination allows axons to conduct about 100 times faster and reduces energy expenditure by restricting depolarization to Na+ channel-rich Ranvier nodes.

    “Myelination allows axons to conduct 100 times faster, and reduce energy expenditures by restricting the depolarization of the axonal membrane to the Na+ channel rich Ranvier nodes (Nave, 2010b).”
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    Premisecitation

    Infantile adrenoleukodystrophy starts between 4 and 8 years of age and is characterized by progressive cognitive decline with inflammatory demyelination of white matter.

    “In its infantile form, the disease starts between 4 and 8 years of age and is characterized by a progressive cognitive decline associated with rampant inflammatory demyelination of the white matter (Moser et al., 2000).”
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    Premisecitation

    Multiple sclerosis is the prototypical neuroinflammatory disease in which demyelination is thought to result from a T-cell mediated autoimmune attack on myelin.

    “Multiple sclerosis (MS) is the prototypical neuroinflammatory disease in which demyelination is thought to be related to a T-cell mediated autoimmune attack on myelin (McFarland and Martin, 2007).”
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    Interpretationreasoning

    Vessels devoid of endothelium, called string vessels, are often observed, reflecting failed endothelial repair possibly due to endothelial progenitor cell dysfunction or loss of growth factors.

    “Vessels devoid of endothelium (string vessels) are often observed, reflecting a failure of endothelial repair, possibly due to EPC dysfunction or loss of neuron and/or glial-derived growth factors.”
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    Premisecitation

    Upregulation of VNa+1.2 channels increases Na+/K+ ATPase activity, further stressing the energy budget of marginally perfused white matter.

    “Upregulation of VNa+1.2 channels increases the activity of the Na+/K+ ATPase, stressing further the energy budget of the marginally perfused white matter (Trapp and Stys, 2009).”
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    Premisecitation

    Loss of myelin slows axon potential transmission and threatens axon integrity, leading to axonal loss.

    “In addition to the brain dysfunction caused by slowing down the transmission of axon potentials, demyelination threatens the integrity of the axons and leads to axonal loss (Franklin and Ffrench-Constant, 2008; Matute and Ransom, 2012).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites Franklin and Ffrench-Constant, 2008 source

      Not checked in the free run.

    • cites Matute and Ransom, 2012 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    Loss of myelin deprives axons of trophic support and increases their vulnerability.

    “Thus, loss of myelin deprives the axons of trophic support and increases their vulnerability.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Upregulation of voltage-dependent Na+ channels in denuded internodal axoplasm attempts to preserve impulse propagation but increases Na+ entry and worsens energy deficit and Ca2+ overload.

    “Furthermore, the adaptive upregulation of voltage-dependent Na+ channels (VNa+) in the denuded internodal axoplasm, attempting to preserve impulse propagation in demyelinated axons, leads to Na+ entry and aggravates the energy deficit and Ca2+ overload.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Trapp and Stys, 2009 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Excess intracellular Ca2+ activates protease-dependent processes that fragment microtubules and perturb axonal flow.

    “In turn, excess intracellular Ca2+ activates protease dependent processes that lead to microtubule fragmentation and perturbation of axonal flow (Franklin and Ffrench-Constant, 2008; Matute and Ransom, 2012).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites Franklin and Ffrench-Constant, 2008 source

      Not checked in the free run.

    • cites Matute and Ransom, 2012 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    X-linked adrenoleukodystrophy is caused by mutations in ABCD1, which encodes a peroxisomal membrane transporter, leading to accumulation of very long chain fatty acids in brain, spinal cord, and adrenal glands.

    “Reductions in white matter CBF has also been found X-linked adrenoleukodystrophy (ALD), a disease caused by mutations in ABCD1, which encodes a peroxisomal membrane transporter protein, leading to accumulation of very long chain fatty acids in brain, spinal cord and adrenal glands (Moser et al., 2000).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Moser et al., 2000 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Leukoaraiosis is associated with focal cortical thinning, especially in frontal cortex, and this finding correlates with executive dysfunction.

    “Leukoaraiosis is associated with focal cortical thinning especially in frontal cortex, a finding correlated with executive dysfunction (Seo et al., 2012).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Seo et al., 2012 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    Hypoxia, inflammation, and oxidative stress damage oligodendrocytes and cause trophic uncoupling in the neurovascular unit, contributing to damage to vascular cells and oligodendrocytes.

    “Hypoxia, inflammation and oxidative stress damage oligodendrocytes and leads to trophic uncoupling in the neurovascular unit, which, in turn, contribute to the damage to vascular cells and oligodendrocytes.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Aged APP mice lacking CD36 are protected from cerebrovascular alterations and behavioral deficits, with reduced cerebral amyloid angiopathy compared with controls but no reduction in amyloid plaques.

    “Aged APP mice deficient in CD36 are protected from cerebrovascular alterations and behavioral deficits, effects associated with reduced CAA compared to controls, but no reduction of amyloid plaques (Park et al., 2013b).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Park et al., 2013b

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    Alzheimer disease brains have a wide variety of vascular lesions, suggesting a potential pathogenic interaction between vascular factors and Alzheimer disease.

    “As discussed in the section on “Mixed lesions”, AD brains have a wide variety of vascular lesions, suggesting a potential pathogenic interaction between vascular factors and AD.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    The vascular changes caused by amyloid-beta are prevented by overexpressing the ROS-scavenging enzyme superoxide dismutase or by lacking the NADPH oxidase subunit NOX2.

    “The vascular alterations induced by Aβ are abrogated by overexpression of the ROS scavenging enzyme superoxide dismutase or deficiency of the NADPH oxidase subunit NOX2 (Iadecola et al., 1999; Park et al., 2005; 2008)”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Iadecola et al., 1999 source

      Not checked in the free run.

    • cites Park et al., 2005 source

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    • cites Park et al., 2008 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    The cerebrovascular effects of amyloid-beta are not explained by cerebral amyloid angiopathy or amyloid plaques, nor by neuronal energy hypometabolism.

    “These data suggest that the cerebrovascular effects of Aβ are not attributable to CAA or amyloid plaques, and are not a consequence of neuronal energy hypometabolism.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Some studies, but not others, have reported increased amyloid deposition in stroke patients, implicating that ischemia promotes Alzheimer disease pathology.

    “Conversely, some studies (Jendroska et al., 1995; Ly et al., 2012), but not others (Aho et al., 2006; Mastaglia et al., 2003), have reported increased amyloid deposition in stroke patients, implicating that ischemia promotes AD pathology.”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites Jendroska et al., 1995 source

      Not checked in the free run.

    • cites Ly et al., 2012

      Not checked in the free run.

    • cites Aho et al., 2006 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    Most dementia cases have mixed pathological features, raising the possibility that vascular factors contribute to Alzheimer disease and other neurodegenerative diseases.

    “The realization that most cases of dementia have mixed pathological features has raised the intriguing possibility that vascular factors play role in AD and other neurodegenerative diseases.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Applying amyloid-beta to the exposed cerebral cortex of mice lowers cerebral blood flow and blunts the increase in cerebral blood flow caused by endothelium-dependent vasodilators and functional hyperemia.

    “application of Aβ4 to the exposed cerebral cortex of mice reduces CBF and impairs the increase in CBF induced by endothelium-dependent vasodilators and functional hyperemia (Niwa et al., 2000a; 2000b)”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites Niwa et al., 2000a

      Not checked in the free run.

    • cites Niwa et al., 2000b

      Not checked in the free run.

  • May combine two claims.

    Interpretationcitation

    In advanced Alzheimer disease, vascular lesions do not appear to have a major influence on progression of cognitive deficits, suggesting Alzheimer pathology is the major driver.

    “In advanced cases of AD, vascular lesions do not seem to have a major influence on the progression of the cognitive deficits, suggesting the AD pathology is the major driver of the cognitive dysfunction (Chui et al., 2006; Jellinger, 2001).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites Chui et al., 2006 source

      Not checked in the free run.

    • cites Jellinger, 2001 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Young mice overexpressing mutated APP with elevated brain amyloid-beta but without plaques, behavioral changes, or reduced resting glucose use show profound impairment of functional hyperemia, endothelium-dependent responses, and autoregulation.

    “functional hyperemia, endothelium-dependent responses and autoregulation are profoundly impaired in young mice overexpressing mutated forms of APP, in which brain Aβ is elevated, but there are no plaques, behavioral alterations, or reductions in resting glucose utilization (Niwa et al., 2000b; 2002; Tong et al., 2012)”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Niwa et al., 2000b

      Not checked in the free run.

    • cites Niwa et al., 2002 source

      Not checked in the free run.

    • cites Tong et al., 2012 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationcitation

    Cerebrovascular function is reduced in patients with early Alzheimer disease or at risk for Alzheimer disease, implicating reduced cerebral perfusion in the pathobiology of the disease.

    “Cerebrovascular function is reduced in patients with early AD or at risk for AD (Claassen et al., 2009; Gao et al., 2013; Luckhaus et al., 2008; Mentis et al., 1996; Niedermeyer, 2006; Ruitenberg et al., 2005; Sabayan et al., 2012; Tanaka et al., 2002), implicating reduced cerebral perfusion in the pathobiology of the disease (Iadecola, 2004).”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites Claassen et al., 2009 source

      Not checked in the free run.

    • cites Gao et al., 2013 source

      Not checked in the free run.

    • cites Luckhaus et al., 2008 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationcitation

    The correlation was strongest for vascular dementia and weakest for Alzheimer disease, suggesting vascular risk factors may independently increase dementia likelihood without exacerbating Alzheimer pathology.

    “Furthermore, the correlation was strongest for vascular dementia and weakest for AD, suggesting that vascular risk factors may independently increase the likelihood of dementia without exacerbating AD pathology (Chui et al., 2012).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Chui et al., 2012

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Rigorous blood pressure control reduces white matter damage and delays cognitive decline.

    “Indeed, rigorous blood pressure control reduces white matter damage and staves off cognitive decline (Sharp et al., 2011; Sörös et al., 2013).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites Sharp et al., 2011 source

      Not checked in the free run.

    • cites Sörös et al., 2013

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Some agents, such as the neurotrophic factor cerebrolysin, produced modest cognitive improvement, but the evidence is not strong enough to justify clinical use.

    “Some agents, like the neurotrophic factor cerebrolysin, showed a modest cognitive improvement, but the evidence is not sufficiently strong to justify clinical use (Chen et al., 2013b).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Chen et al., 2013b

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S4 (based). May combine two claims.

    Interpretationnone given

    Vascular cognitive impairment and vascular dementia are major contributors to age-related dementing illnesses and comprise a heterogeneous group of cognitive disorders attributable to vascular causes.

    “VCI and vascular dementia are major contributors to age-relate dementing illnesses and comprise a heterogeneous group of cognitive disorders attributable to vascular causes.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    Because vascular cognitive impairment frequently overlaps with Alzheimer's disease, its diagnosis can be challenging, complicating the choice of the best therapeutic approach.

    “Furthermore, due to frequent overlap with AD, the diagnosis of VCI can be challenging, complicating the choice of the best therapeutic approach (Wang et al., 2012).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Wang et al., 2012 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Physical and mental activity, social engagement, and a diet rich in antioxidants or polyunsaturated fatty acids reduce dementia risk.

    “Physical and mental activity, social engagement, and a diet rich in antioxidants or polyunsaturated fatty acids reduce dementia risk (Aarsland et al., 2010; Akinyemi et al., 2013; Middleton and Yaffe, 2009; Verdelho et al., 2012).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Aarsland et al., 2010 source

      Not checked in the free run.

    • cites Akinyemi et al., 2013 source

      Not checked in the free run.

    • cites Middleton and Yaffe, 2009 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    A UK population study suggests that dementia prevalence may be decreasing, a finding interpreted as reflecting the beneficial effects of controlling blood pressure and other risk factors.

    “A study in the UK population suggests that the prevalence of dementia may be decreasing, a finding interpreted to reflect the beneficial effects of controlling blood pressure and other risk factors (Matthews et al., 2013).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Matthews et al., 2013 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Despite positive results in models of hypoperfusion-induced white matter damage, there are no FDA-approved treatments for vascular cognitive impairment and vascular dementia.

    “Despite these positive results in models of hypoperfusion-induced white matter damage, there are no FDA approved treatments for VCI and vascular dementia (Butler and Radhakrishnan, 2012).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Butler and Radhakrishnan, 2012

      Not checked in the free run.

  • May combine two claims.

    Interpretationnone given

    Despite diversity in underlying brain pathology, vascular alterations share similar pathogenic bases, arising from hypoperfusion, oxidative stress, and inflammation, which lead to endothelial damage, blood-brain barrier breakdown, innate immune activation, and disruption of trophic coupling between vascular and brain cells.

    “Despite the diversity of the underlying brain pathology, the vascular alterations have a similar pathogenic bases, resulting from hypoperfusion, oxidative stress and inflammation, which in turn lead to endothelial damage, BBB breakdown, activation of innate immunity and disruption of trophic coupling between vascular and brain cells.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Interpretationnone given

    The hemispheric white matter is particularly susceptible to the harmful effects of vascular risk factors and is a major target of these vascular alterations.

    “The hemispheric white matter, which is particularly susceptible to the deleterious effects of vascular risk factors, is a major target of these vascular alterations.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationreasoning

    The role of hypoperfusion, blood-brain barrier disruption, oxidative stress, and inflammation is well established in animal models of white matter damage, but therapies based on these pathogenic mechanisms have not been successful.

    “The role of hypoperfusion, BBB disruption, oxidative stress and inflammation is well established in animal models of white matter damage, but therapies based on these pathogenic mechanisms have not been successful.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Study design and conductcitation

    Most evidence for risk factor modification comes from observational studies and has not been confirmed by randomized clinical trials.

    “However, most of the evidence is based on observational studies, which have not been confirmed by randomized clinical trials of risk factor modification, stressing the need for further large scale studies (Dichgans and Zietemann, 2012; Middleton and Yaffe, 2009).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites Dichgans and Zietemann, 2012 source

      Not checked in the free run.

    • cites Middleton and Yaffe, 2009 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    Vascular risk factors can increase amyloid accumulation and the risk of clinically defined Alzheimer's disease.

    “Vascular risk factors can increase amyloid accumulation and the risk of clinically defined AD.”
    Quote in the paperSubstantial claim
79 of 79
  • The paper relies on this without support.

    Mechanisms observed in animal models of cerebral hypoperfusion and white matter injury are representative of the pathogenic processes in human vascular cognitive impairment.

    “Cerebral hypoperfusion is associated with white matter inflammation and oxidative stress in rodent models (Dong et al., 2011; Huang et al., 2010; Ihara et al., 2001; Juma et al., 2011; Masumura et al., 2001; Reimer et al., 2011; Yoshizaki et al., 2008), indicating that hypoxia-ischemia is sufficient to trigger these responses.”
    “In vivo, hypoperfusion produced by bilateral carotid stenosis in rat increases BBB permeability (Ueno et al., 2002).”
  • The paper relies on this without support.

    The vascular risk factors and pathological processes identified in the reviewed studies are representative of the general population with vascular cognitive impairment.

    “Ascertaining the genetic and modifiable risk factors of VCI is problematic due to the multiplicity of underlying pathologies, coexistence with cardiovascular diseases, and the frequent overlap with AD and other neurodegenerative diseases (Gorelick et al., 2011).”
  • The paper relies on this without support.

    Mixed dementia is the most common cause of dementia in the elderly.

    “Considering that mixed dementia is the most common cause of dementia in the elderly”
  • The paper relies on this without support.

    Dementia has a long preclinical phase.

    “the long preclinical phase of dementia is problematic, since, in VCI as in AD, initiating therapy when patients become symptomatic may be too late.”
4 of 4

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Different cell types of the neurovascular unit (NVU) including vascular cells, glia, and neurons contribute to regulation of BBB permeability, neurovascular coupling, cell-matrix interactions, neurotransmitter turnover, and angiogenesis and neurogenesis.

    “Different cell types of the neurovascular unit (NVU) including vascular cells [e.g., endothelium and mural cells including pericytes and smooth muscle cells (SMCs)], glia (e.g., astrocytes, microglia), and neurons contribute to regulation of BBB permeability, neurovascular coupling, cell-matrix interactions, neurotransmitter turnover, and angiogenesis and neurogenesis (270, 271, 692, 693)”

    From Blood-Brain Barrier: From Physiology to Disease and Back (2019) · cites this paper as [270]

    The sections on neurovascular control mechanisms and trophic coupling describe neurons, astrocytes, and vascular cells acting together in neurovascular coupling, BBB maintenance, angiogenesis, and neurogenesis. The passages do not establish the claimed roles in cell-matrix interactions or neurotransmitter turnover. Page numbers were not available in our copy. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • In patients and mouse models of AD, fibrinogen extravasates in the brain at sites of impaired blood-brain barrier integrity and cerebrovascular dysfunction, which are early features of AD pathogenesis.

    “In patients and mouse models of AD, fibrinogen extravasates in the brain at sites of impaired blood-brain barrier integrity and cerebrovascular dysfunction, which are early features of AD pathogenesis.21,39-42”

    From Machine learning reveals prominent spontaneous behavioral changes and treatment efficacy in humanized and transgenic Alzheimer's disease models (2024) · cites this paper as [41]

    The sections on white matter injury describe fibrinogen extravasation following BBB disruption, while the section on overlap with neurodegenerative dementia describes early cerebrovascular dysfunction in AD and BBB disruption associated with ApoE4. The paper does not establish that fibrinogen extravasates specifically in patients and mouse models of AD at those sites; its fibrinogen discussion concerns vascular white matter injury. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • BBB breakdown and dysfunction is associated with cerebral blood flow (CBF) reductions and dysregulation, contributing to neurological deficits.

    “which is associated with cerebral blood flow (CBF) reductions and dysregulation (269-271, 318), contributing to neurological deficits.”

    From Blood-Brain Barrier: From Physiology to Disease and Back (2019) · cites this paper as [270]

  • Any of the multiple causes of clinical stroke can cause vascular cognitive impairment.

    “In principle, any of the multiple causes of clinical stroke can cause vascular cognitive impairment.”

    From Vascular Cognitive Impairment (2017) · cites this paper as [44]

  • Deterioration of the vascular bed may occur alone or with other pathologies, leading to progressive demyelination and white matter loss.

    “Deterioration of the vascular bed may occur alone or in combination with other pathologies (97), leading to progressive demyelination and loss of white matter (98).”

    From Glymphatic failure as a final common pathway to dementia (2020) · cites this paper as [97]

Cites

Flagged first, then by citations

23 of the 364 references couldn’t be matched to a known paper.

Research works printed but not linked: 1

  1. Butler, 2012, Dementia, Clin. Evid. (Online)

Cited by

Sorted by citations

Authors
Iadecola, C.
Affiliations
Weill Cornell Medicine (US)
Corresponding author
Iadecola, Costantino
Venue
Neuron
Publisher
Elsevier BV
Published
2013-11
Volume
80
Issue
4
Pages
844-866
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2037426713
Cited by
1,857
References
364
Citations by year
2026: 162 · 2025: 197 · 2024: 160 · 2023: 145 · 2022: 184 · 2021: 164 · 2020: 176 · 2019: 150 · 2018: 135 · 2017: 119 · 2016: 112 · 2015: 100 · 2014: 51
FWCI
8.51
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Heart, Lung, and Blood Institute (HL-96571, P01HL096571)
  • National Institute of Neurological Disorders and Stroke (NS-37853, R01NS073666, R01NS037853)
Topics
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Neurology › Cerebrovascular and genetic disorders
Keywords
vascular dementia, vascular cognitive impairment, Alzheimer's disease, mixed dementia, cerebrovascular disease, cerebral vasculature, white matter, neurovascular interactions, glia, vascular risk factors, dementia prevention, dementia treatment
MeSH terms
Alzheimer Disease, Cerebrovascular Circulation, Cognition Disorders, Humans, Dementia, Vascular, Stroke, Atherosclerosis

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-04.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-04.

Statistics and arithmetic are recomputed, not judged.

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