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Shin YJ, Evitts KM, Jin S, Howard C, Sharp-Milgrom M, Schwarze-Taufiq T, Kinoshita C, Young JE, Zheng Y. Amyloid beta peptides (Aβ) from Alzheimer's disease neuronal secretome induce endothelial activation in a human cerebral microvessel model. Neurobiol Dis 2023; 181:106125. [PMID: 37062307 DOI: 10.1016/j.nbd.2023.106125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 03/19/2023] [Accepted: 04/12/2023] [Indexed: 04/18/2023] Open
Abstract
In Alzheimer's disease (AD), secretion and deposition of amyloid beta peptides (Aβ) have been associated with blood-brain barrier dysfunction. However, the role of Aβ in endothelial cell (EC) dysfunction remains elusive. Here we investigated AD mediated EC activation by studying the effect of Aβ secreted from human induced pluripotent stem cell-derived cortical neurons (hiPSC-CN) harboring a familial AD mutation (Swe+/+) on human brain microvascular endothelial cells (HBMECs) in 2D and 3D perfusable microvessels. We demonstrated that increased Aβ levels in Swe+/+ conditioned media (CM) led to stress fiber formation and upregulation of genes associated with endothelial inflammation and immune-adhesion. Perfusion of Aβ-rich Swe+/+ CM induced acute formation of von Willebrand factor (VWF) fibers in the vessel lumen, which was attenuated by reducing Aβ levels in CM. Our findings suggest that Aβ peptides can trigger rapid inflammatory and thrombogenic responses within cerebral microvessels, which may exacerbate AD pathology.
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Affiliation(s)
- Yu Jung Shin
- Department of Bioengineering, University of Washington, Seattle, WA 98109, United States of America; Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98109, United States of America
| | - Kira M Evitts
- Department of Bioengineering, University of Washington, Seattle, WA 98109, United States of America; Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98109, United States of America
| | - Solhee Jin
- Department of Bioengineering, University of Washington, Seattle, WA 98109, United States of America
| | - Caitlin Howard
- Department of Bioengineering, University of Washington, Seattle, WA 98109, United States of America; Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98109, United States of America
| | - Margaret Sharp-Milgrom
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA 98109, United States of America
| | - Tiara Schwarze-Taufiq
- Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98109, United States of America; Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA 98109, United States of America
| | - Chizuru Kinoshita
- Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98109, United States of America; Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA 98109, United States of America
| | - Jessica E Young
- Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98109, United States of America; Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA 98109, United States of America.
| | - Ying Zheng
- Department of Bioengineering, University of Washington, Seattle, WA 98109, United States of America; Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA 98109, United States of America.
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Perpetuini D, Filippini C, Zito M, Cardone D, Merla A. Altered Microcirculation in Alzheimer’s Disease Assessed by Machine Learning Applied to Functional Thermal Imaging Data. Bioengineering (Basel) 2022; 9:bioengineering9100492. [PMID: 36290459 PMCID: PMC9598647 DOI: 10.3390/bioengineering9100492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 09/12/2022] [Accepted: 09/16/2022] [Indexed: 11/24/2022] Open
Abstract
Alzheimer’s disease (AD) is characterized by progressive memory failures accompanied by microcirculation alterations. Particularly, impaired endothelial microvascular responsiveness and altered flow motion patterns have been observed in AD patients. Of note, the endothelium influences the vascular tone and also the small superficial blood vessels, which can be evaluated through infrared thermography (IRT). The advantage of IRT with respect to other techniques relies on its contactless features and its capability to preserve spatial information of the peripheral microcirculation. The aim of the study is to investigate peripheral microcirculation impairments in AD patients with respect to age-matched healthy controls (HCs) at resting state, through IRT and machine learning (ML) approaches. Particularly, several classifiers were tested, employing as regressors the power of the nose tip temperature time course in different physiological frequency bands. Among the ML classifiers tested, the Decision Tree Classifier (DTC) delivered the best cross-validated accuracy (accuracy = 82%) when discriminating between AD and HCs. The results further demonstrate the alteration of microvascular patterns in AD in the early stages of the pathology, and the capability of IRT to assess vascular impairments. These findings could be exploited in clinical practice, fostering the employment of IRT as a support for the early diagnosis of AD.
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Affiliation(s)
- David Perpetuini
- Department of Neuroscience and Imaging, University “G. D’Annunzio” of Chieti-Pescara, 66100 Chieti, Italy
- Correspondence: ; Tel.: +39-0871-3556954
| | - Chiara Filippini
- Department of Neuroscience and Imaging, University “G. D’Annunzio” of Chieti-Pescara, 66100 Chieti, Italy
| | - Michele Zito
- Department of Medicine and Science of Ageing, University “G. D’Annunzio” of Chieti-Pescara, 66100 Chieti, Italy
| | - Daniela Cardone
- Department of Engineering and Geology, University “G. D’Annunzio” of Chieti-Pescara, 66100 Chieti, Italy
| | - Arcangelo Merla
- Department of Engineering and Geology, University “G. D’Annunzio” of Chieti-Pescara, 66100 Chieti, Italy
- Next2U s.r.l., 65127 Pescara, Italy
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Ziliotto N, Bernardi F, Piazza F. Hemostasis components in cerebral amyloid angiopathy and Alzheimer's disease. Neurol Sci 2021; 42:3177-3188. [PMID: 34041636 DOI: 10.1007/s10072-021-05327-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 05/15/2021] [Indexed: 01/17/2023]
Abstract
Increased cerebrovascular amyloid-β (Aβ) deposition represents the main pathogenic mechanisms characterizing Alzheimer's disease (AD) and cerebral amyloid angiopathy (CAA). Whereas an increasing number of studies define the contribution of fibrin(ogen) to neurodegeneration, how other hemostasis factors might be pleiotropically involved in the AD and CAA remains overlooked. Although traditionally regarded as pertaining to hemostasis, these proteins are also modulators of inflammation and angiogenesis, and exert cytoprotective functions. This review discusses the contribution of hemostasis components to Aβ cerebrovascular deposition, which settle the way to endothelial and blood-brain barrier dysfunction, vessel fragility, cerebral bleeding, and the associated cognitive changes. From the primary hemostasis, the process that refers to platelet aggregation, we discuss evidence regarding the von Willebrand factor (vWF) and its regulator ADAMTS13. Then, from the secondary hemostasis, we focus on tissue factor, which triggers the extrinsic coagulation cascade, and on the main inhibitors of coagulation, i.e., tissue factor pathway inhibitor (TFPI), and the components of protein C pathway. Last, from the tertiary hemostasis, we discuss evidence on FXIII, involved in fibrin cross-linking, and on components of fibrinolysis, including tissue-type plasminogen activator (tPA), urokinase-type plasminogen activator (uPA) and its receptor uPA(R), and plasminogen activator inhibitor-1 (PAI-1). Increased knowledge on contributors of Aβ-related disease progression may favor new therapeutic approaches for early modifiable risk factors.
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Affiliation(s)
- Nicole Ziliotto
- CAA and AD Translational Research and Biomarkers Laboratory, School of Medicine and Surgery, University of Milano - Bicocca, Via Cadore 48, 20900, Monza, Italy.
| | - Francesco Bernardi
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Fabrizio Piazza
- CAA and AD Translational Research and Biomarkers Laboratory, School of Medicine and Surgery, University of Milano - Bicocca, Via Cadore 48, 20900, Monza, Italy
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Stanciu GD, Ababei DC, Bild V, Bild W, Paduraru L, Gutu MM, Tamba BI. Renal Contributions in the Pathophysiology and Neuropathological Substrates Shared by Chronic Kidney Disease and Alzheimer's Disease. Brain Sci 2020; 10:brainsci10080563. [PMID: 32824404 PMCID: PMC7464898 DOI: 10.3390/brainsci10080563] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/04/2020] [Accepted: 08/14/2020] [Indexed: 12/11/2022] Open
Abstract
Chronic kidney disease and Alzheimer’s disease are chronic conditions highly prevalent in elderly communities and societies, and a diagnosis of them is devastating and life changing. Demanding therapies and changes, such as non-compliance, cognitive impairment, and non-cognitive anomalies, may lead to supplementary symptoms and subsequent worsening of well-being and quality of life, impacting the socio-economic status of both patient and family. In recent decades, additional hypotheses have attempted to clarify the connection between these two diseases, multifactorial in their nature, but even so, the mechanisms behind this link are still elusive. In this paper, we sought to highlight the current understanding of the mechanisms for cognitive decline in patients with these concurrent pathologies and provide insight into the relationship between markers related to these disease entities and whether the potential biomarkers for renal function may be used for the diagnosis of Alzheimer’s disease. Exploring detailed knowledge of etiologies, heterogeneity of risk factors, and neuropathological processes associated with these conditions opens opportunities for the development of new therapies and biomarkers to delay or slow their progression and validation of whether the setting of chronic kidney disease could be a potential determinant for cognitive damage in Alzheimer’s disease.
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Affiliation(s)
- Gabriela Dumitrita Stanciu
- Center for Advanced Research and Development in Experimental Medicine (CEMEX), “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii street, 700115 Iasi, Romania; (G.D.S.); (B.-I.T.)
| | - Daniela Carmen Ababei
- Pharmacodynamics and Clinical Pharmacy Department, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii street, 700115 Iasi, Romania;
- Correspondence: (D.C.A.); (L.P.)
| | - Veronica Bild
- Pharmacodynamics and Clinical Pharmacy Department, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii street, 700115 Iasi, Romania;
| | - Walther Bild
- Department of Physiology, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii street, 700115 Iasi, Romania;
| | - Luminita Paduraru
- Department Mother & Child Care, Division Neonatology, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii street, 700115 Iasi, Romania
- Correspondence: (D.C.A.); (L.P.)
| | - Mihai Marius Gutu
- Department of Biophysics and Medical Physics-Nuclear Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii street, 700115 Iasi, Romania;
| | - Bogdan-Ionel Tamba
- Center for Advanced Research and Development in Experimental Medicine (CEMEX), “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii street, 700115 Iasi, Romania; (G.D.S.); (B.-I.T.)
- Department of Pharmacology, Clinical Pharmacology and Algesiology, “Grigore T. Popa” University of Medicine and Pharmacy, 16 Universitatii street, 700115 Iasi, Romania
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Zhou Z, Liang Y, Zhang X, Xu J, Lin J, Zhang R, Kang K, Qu H, Zhao C, Zhao M. Fibrinogen and risk of dementia: A systematic review and meta-analysis. Neurosci Biobehav Rev 2020; 112:353-360. [PMID: 32081688 DOI: 10.1016/j.neubiorev.2020.02.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 01/22/2020] [Accepted: 02/16/2020] [Indexed: 12/19/2022]
Abstract
BACKGROUND The aim of this meta-analysis is to evaluate the association of fibrinogen with risk of dementia and its subtypes. METHODS Embase, Pubmed and Web of Science were retrieved systematically up to February 2019. Standard mean difference (SMD) with 95 % confidence intervals was estimated using random-effects models. RESULTS Sixteen studies involving 3,649 participants were summarized. Patients with all-cause dementia exhibited higher fibrinogen levels than those in non-dementia controls (SMD = 0.90 [0.43;1.36] p < 0.01). Further subgroup analysis revealed a positive association of fibrinogen with vascular dementia (VaD) (SMD = 1.11 [0.45;1.78] p < 0.01) rather than Alzheimer's disease (AD) (SMD = 0.01 [-0.17;0.19]) p = 0.92) and Parkinson's disease dementia (PDD) (SMD = 0.35 [-0.23;0.93] p = 0.24). This correlation was significant in Europeans (SMD = 0.92 [0.34;1.49] p < 0.01), but probably not in Asian based populations (SMD = 1.04 [-0.09;2.17] p = 0.07), and gradually declined with advancing age (60 ≤ age < 70: SMD = 1.22 [0.38;2.06] p < 0.01; 70 ≤ age < 80: SMD = 0.29 [0.04;0.53] p = 0.02; age ≥ 80: SMD = 0.01 [-0.12;0.15] p = 0.84). CONCLUSIONS Plasma fibrinogen is a potential risk factor for all-cause dementia and VaD under the age of 80, and is more obvious in cohorts with people of European descent.
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Affiliation(s)
- Zhike Zhou
- Department of Geriatrics, The First Affiliated Hospital, China Medical University, Shenyang, 110001, Liaoning, PR China
| | - Yifan Liang
- Department of Neurology, The First Affiliated Hospital, China Medical University, Shenyang, 110001, Liaoning, PR China
| | - Xiaoqian Zhang
- Department of Neurology, The First Affiliated Hospital, China Medical University, Shenyang, 110001, Liaoning, PR China
| | - Junjie Xu
- Department of Laboratory Medicine, The First Affiliated Hospital, China Medical University, Shenyang, 110001, Liaoning, PR China
| | - Jueying Lin
- Department of Emergency, Zhongshan Hospital Xiamen University, Xiamen, 361004, Fujian, PR China
| | - Rongwei Zhang
- Department of Geriatrics, The First Affiliated Hospital, China Medical University, Shenyang, 110001, Liaoning, PR China
| | - Kexin Kang
- Department of Geriatrics, The First Affiliated Hospital, China Medical University, Shenyang, 110001, Liaoning, PR China
| | - Huiling Qu
- Department of Neurology, People's Hospital of Liaoning Province, Shenyang, 110016, Liaoning, PR China
| | - Chuansheng Zhao
- Department of Neurology, The First Affiliated Hospital, China Medical University, Shenyang, 110001, Liaoning, PR China.
| | - Mei Zhao
- Department of Cardiology, The Shengjing Affiliated Hospital, China Medical University, Shenyang, 110004, Liaoning, PR China.
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Huang CW, Tsai MH, Chen NC, Chen WH, Lu YT, Lui CC, Chang YT, Chang WN, Chang AYW, Chang CC. Clinical significance of circulating vascular cell adhesion molecule-1 to white matter disintegrity in Alzheimer’s dementia. Thromb Haemost 2017; 114:1230-40. [DOI: 10.1160/th14-11-0938] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2014] [Accepted: 07/03/2015] [Indexed: 02/04/2023]
Abstract
SummaryEndothelial dysfunction leads to worse cognitive performance in Alzheimer’s dementia (AD). While both cerebrovascular risk factors and endothelial dysfunction lead to activation of vascular cell adhesion molecule-1 (VCAM-1), intercellular adhesion molecule-1 (ICAM-1) and E-selectin, it is not known whether these biomarkers extend the diagnostic repertoire in reflecting intracerebral structural damage or cognitive performance. A total of 110 AD patients and 50 age-matched controls were enrolled. Plasma levels of VCAM-1, ICAM-1 and E-selectin were measured and correlated with the cognitive performance, white matter macro-structural changes, and major tract-specific fractional anisotropy quantification. The AD patients were further stratified by clinical dementia rating score (mild dementia, n=60; moderate-to-severe dementia, n=50). Compared with the controls, plasma levels of VCAM-1 (p< 0.001), ICAM-1 (p=0.028) and E-selectin (p=0.016) were significantly higher in the patients, but only VCAM-1 levels significantly reflected the severity of dementia (p< 0.001). In addition, only VCAM-1 levels showed an association with macro- and micro- white matter changes especially in the superior longitudinal fasciculus (p< 0.001), posterior thalamic radiation (p=0.002), stria terminalis (p=0.002) and corpus callosum (p=0.009), and were independent of, age and cortical volume. These tracts show significant association with MMSE, short term memory and visuospatial function. Meanwhile, while VCAM-1 level correlated significantly with short-term memory (p=0.026) and drawing (p=0.025) scores in the AD patients after adjusting for age and education, the significance disappeared after adjusting for global FA. Endothelial activation, especially VCAM-1, was of clinical significance in AD that reflects macro- and micro-structural changes and poor short term memory and visuospatial function.
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Uiterwijk R, Huijts M, Staals J, Rouhl RPW, De Leeuw PW, Kroon AA, Van Oostenbrugge RJ. Endothelial Activation Is Associated With Cognitive Performance in Patients With Hypertension. Am J Hypertens 2016; 29:464-9. [PMID: 26271106 DOI: 10.1093/ajh/hpv122] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 07/06/2015] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Hypertension is associated with the occurrence of cognitive deficits and dementia, probably because hypertension is a major risk factor for the occurrence of brain damage as a result of cerebral small vessel disease (cSVD). Endothelial activation and inflammation have been suggested to play an important role in the pathogenesis of cSVD. We investigated if compound scores of endothelial activation or inflammation, based on several blood markers, are associated with cognitive performance 3 years later in patients with essential hypertension. METHODS At baseline, levels of blood markers of endothelial activation (soluble vascular cellular adhesion molecule-1 (sVCAM-1), soluble intercellular adhesion molecule-1 (sICAM-1), sP-selectin, and sE-selectin) and markers of inflammation (neopterin, C-reactive protein, and sICAM-1) were measured and transformed into compound scores using z-scores. In addition, a brain magnetic resonance imaging (MRI) was performed to determine the presence of cSVD-related MRI markers. Three years later, patients underwent a neuropsychological assessment to determine cognitive performance. RESULTS A total of 101 patients with hypertension were included in the present study. In multiple linear regression analyses with correction for demographics and MRI markers, the compound score of endothelial activation (B = -0.19, 95% confidence interval = -0.34 to -0.04, P = 0.014), but not of inflammation (B = -0.09, 95% confidence interval = -0.22 to 0.05, P = 0.198), was associated with worse cognitive performance. CONCLUSIONS Our results show that an overall measure of endothelial activation is associated with cognitive performance in patients with essential hypertension. This indicates that a process involving endothelial activation might play a role in the pathogenesis of cognitive problems in patients with hypertension.
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Affiliation(s)
- Renske Uiterwijk
- Department of Neurology, Maastricht University Medical Center, Maastricht, The Netherlands; School for Mental Health and Neuroscience (MHeNS), Maastricht University, Maastricht, The Netherlands;
| | - Marjolein Huijts
- Department of Psychiatry and Psychology, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Julie Staals
- Department of Neurology, Maastricht University Medical Center, Maastricht, The Netherlands; Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Rob P W Rouhl
- Department of Neurology, Maastricht University Medical Center, Maastricht, The Netherlands; School for Mental Health and Neuroscience (MHeNS), Maastricht University, Maastricht, The Netherlands
| | - Peter W De Leeuw
- Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands; Department of Internal Medicine, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Abraham A Kroon
- Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands; Department of Internal Medicine, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Robert J Van Oostenbrugge
- Department of Neurology, Maastricht University Medical Center, Maastricht, The Netherlands; School for Mental Health and Neuroscience (MHeNS), Maastricht University, Maastricht, The Netherlands; Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands
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Zhu Y, Chen Z, Chen X, Hu S. Serum sEPCR levels are elevated in patients with Alzheimer's disease. Am J Alzheimers Dis Other Demen 2015; 30:517-21. [PMID: 25588409 PMCID: PMC10852812 DOI: 10.1177/1533317514567124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Blood-brain barrier impairment and endothelial cell dysfunction have both been implicated in the pathogenesis of Alzheimer's disease (AD). The presence of vascular risk factors is also known to increase the risk of AD. Soluble endothelial protein C receptor (sEPCR) should thus produce procoagulant and proinflammatory effects. Serum sEPCR levels have been found to be associated with several diseases. To date, no reports have been published regarding serum sEPCR levels in AD. In this study, we found that serum sEPCR levels were significantly increased in patients with AD when compared to control participants (P = .0005). There was no significant difference between patients with mild cognitive impairment (MCI) and healthy controls (P = .055) or between patients with AD and MCI (P = .054). Importantly, our results also indicate that the degree of cognitive impairment is significantly correlated with serum sEPCR levels in all patients and healthy controls. These findings suggest that serum sEPCR levels could be a potential candidate for a biomarker panel for AD diagnosis.
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Affiliation(s)
- Yongjian Zhu
- Department of Rehabilitation, Huangshi Central Hospital, Affiliated Hospital of Hubei Polytechnic University, Huangshi, China
| | - Zhilong Chen
- Department of Gerontology, Huangshi Central Hospital, Affiliated Hospital of Hubei Polytechnic University, Huangshi, China
| | - Xugang Chen
- Department of Neurosurgery, the People's Hospital of Daye City, Daye, China
| | - Sheng Hu
- Department of Neurosurgery, Huangshi Central Hospital, Affiliated Hospital of Hubei Polytechnic University, Huangshi, China
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Canobbio I, Abubaker AA, Visconte C, Torti M, Pula G. Role of amyloid peptides in vascular dysfunction and platelet dysregulation in Alzheimer's disease. Front Cell Neurosci 2015; 9:65. [PMID: 25784858 PMCID: PMC4347625 DOI: 10.3389/fncel.2015.00065] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Accepted: 02/11/2015] [Indexed: 12/28/2022] Open
Abstract
Alzheimer's disease (AD) is the most common neurodegenerative cause of dementia in the elderly. AD is accompanied by the accumulation of amyloid peptides in the brain parenchyma and in the cerebral vessels. The sporadic form of AD accounts for about 95% of all cases. It is characterized by a late onset, typically after the age of 65, with a complex and still poorly understood aetiology. Several observations point towards a central role of cerebrovascular dysfunction in the onset of sporadic AD (SAD). According to the "vascular hypothesis", AD may be initiated by vascular dysfunctions that precede and promote the neurodegenerative process. In accordance to this, AD patients show increased hemorrhagic or ischemic stroke risks. It is now clear that multiple bidirectional connections exist between AD and cerebrovascular disease, and in this new scenario, the effect of amyloid peptides on vascular cells and blood platelets appear to be central to AD. In this review, we analyze the effect of amyloid peptides on vascular function and platelet activation and its contribution to the cerebrovascular pathology associated with AD and the progression of this disease.
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Affiliation(s)
- Ilaria Canobbio
- Department of Biology and Biotechnology, Unit of Biochemistry, University of Pavia Pavia, Italy
| | - Aisha Alsheikh Abubaker
- Department of Biology and Biotechnology, Unit of Biochemistry, University of Pavia Pavia, Italy
| | - Caterina Visconte
- Department of Biology and Biotechnology, Unit of Biochemistry, University of Pavia Pavia, Italy
| | - Mauro Torti
- Department of Biology and Biotechnology, Unit of Biochemistry, University of Pavia Pavia, Italy
| | - Giordano Pula
- Department of Biology and Biotechnology, Unit of Biochemistry, University of Pavia Pavia, Italy
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Marksteiner J, Imarhiagbe D, Defrancesco M, Deisenhammer EA, Kemmler G, Humpel C. Analysis of 27 vascular-related proteins reveals that NT-proBNP is a potential biomarker for Alzheimer's disease and mild cognitive impairment: a pilot-study. Exp Gerontol 2013; 50:114-21. [PMID: 24333505 DOI: 10.1016/j.exger.2013.12.001] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 11/18/2013] [Accepted: 12/01/2013] [Indexed: 11/30/2022]
Abstract
Alzheimer's disease (AD) is a severe neurodegenerative disease. Cerebrovascular changes often accompany AD-related pathology. Despite a considerable progress in the diagnostic accuracy of AD, no blood biomarkers have been established so far. The aim of the present study was to search for changes in plasma levels of 27 vascular-related proteins of healthy controls, patients with mild cognitive impairment (MCI) and AD. In a sample of 80 participants we showed that out of these 27 proteins, six proteins were slightly changed (up to 1.5×) in AD (alpha2-macroglobulin, apolipoprotein-A1, plasminogen activator inhibitor, RAGE, Tissue Inhibitors of Metalloproteinases-1 and Trombospondin-2) and one marker (serum amyloid A) was enhanced up to 6× but with a very high variance. However, N-terminal pro-brain natriuretic peptide (NT-proBNP) was significantly enhanced both in MCI and AD patients (1.9×). In a second analysis of a sample of 110 subjects including younger healthy controls, we confirmed that NT-proBNP has the potential to be a stable candidate protein for both diagnosis and AD disease progression.
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Affiliation(s)
- Josef Marksteiner
- Department of Psychiatry and Psychotherapy A, Landeskrankenhaus Hall, Austria
| | - Douglas Imarhiagbe
- Department of Psychiatry and Psychotherapy A, Landeskrankenhaus Hall, Austria
| | - Michaela Defrancesco
- Memory Clinics, Department of Psychiatry and Psychotherapy Innsbruck, Innsbruck, Austria
| | | | - Georg Kemmler
- Laboratory for Experimental Alzheimer's Disease, Department of Psychiatry and Psychotherapy Innsbruck, Innsbruck, Austria
| | - Christian Humpel
- Laboratory for Experimental Alzheimer's Disease, Department of Psychiatry and Psychotherapy Innsbruck, Innsbruck, Austria.
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Cacabelos R, Fernández-Novoa L, Lombardi V, Corzo L, Pichel V, Kubota Y. Cerebrovascular risk factors in Alzheimer's disease: Brain hemodynamics and pharmacogenomic implications. Neurol Res 2013; 25:567-80. [PMID: 14503010 DOI: 10.1179/016164103101202002] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Recent evidence indicates that different vascular risk factors are present in Alzheimer's disease (AD) and other prevalent dementia types probably contributing to deterioration of cerebrovascular function, thus enhancing neurodegeneration and premature neuronal death due to a reduction in brain perfusion. Brain blood flow shows a reduced velocity and increased pulsatility (PI) and resistance indices (RI) in different types of dementia and in diabetes and hypertension, as well. High levels of diastolic blood pressure correlate with diminished brain blood flow and elevated PI and RI, accompanied by cognitive deterioration. Nitric oxide (NO) levels are found increased in the sera and brain tissue of AD patients. Vascular risk factors (hyperglycemia, LDL-cholesterol, triglycerides, hypertension) and altered brain hemodynamic parameters correlate with APOE genotypes of which APOE-4/4 carriers represent the AD population with the highest cerebrovascular risk. In addition, the genomic profiles of patients with dementia integrating AD-related genes (APOE, PS1, PS2, cFOS) in a mini-tetragenic haplotype significantly differ from controls with an absolute genetic variation of about 50%-60%. Cerebrovascular dysfunction is a factor common to most types of dementia; however, genetic variation among different dementia types might be determinant for the activation of early vascular events inducing or accelerating neurodegeneration. In this regard, cerebrovascular dysfunction should be considered a potential therapeutic target in dementia.
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Affiliation(s)
- Ramón Cacabelos
- Department of Clinical Neuroscience, EBIOTEC, EuroEspes Biomedical Research Center, Institute for CNS Disorders, Bergondo, Coruña, Spain.
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Salvolini E, Vignini A, Nanetti L, Luzzi S, Provinciali L, Di Primio R, Mazzanti L. Effects of Plasma from Patients Affected by Mild Cognitive Impairment and Alzheimer's Disease on Cultured Endothelial Cells. EUR J INFLAMM 2013. [DOI: 10.1177/1721727x1301100216] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Affiliation(s)
- E. Salvolini
- Dipartimento di Scienze Cliniche e Molecolari - Istologia, Università Politecnica delle Marche, Ancona, Italy
| | - A. Vignini
- Dipartimento di Scienze Cliniche Specialistiche ed Odontostomatologiche - Biochimica, Università Politecnica delle Marche, Ancona, Italy
| | - L. Nanetti
- Dipartimento di Scienze Cliniche Specialistiche ed Odontostomatologiche - Biochimica, Università Politecnica delle Marche, Ancona, Italy
| | - S. Luzzi
- Dipartimento di Medicina Sperimentale e Clinica, Clinica Neurologica, Università Politecnica delle Marche, Ancona, Italy
| | - L. Provinciali
- Dipartimento di Medicina Sperimentale e Clinica, Clinica Neurologica, Università Politecnica delle Marche, Ancona, Italy
| | - R. Di Primio
- Dipartimento di Scienze Cliniche e Molecolari - Istologia, Università Politecnica delle Marche, Ancona, Italy
| | - L. Mazzanti
- Dipartimento di Scienze Cliniche Specialistiche ed Odontostomatologiche - Biochimica, Università Politecnica delle Marche, Ancona, Italy
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13
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Toda N. [Nitrergic cerebrovascular regulation as affected by donepezil]. Nihon Yakurigaku Zasshi 2013; 141:150-4. [PMID: 23470480 DOI: 10.1254/fpj.141.150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Wennström M, Nielsen HM. Cell adhesion molecules in Alzheimer's disease. Degener Neurol Neuromuscul Dis 2012; 2:65-77. [PMID: 30890880 DOI: 10.2147/dnnd.s19829] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Cell adhesion molecules (CAMs) mediate interactions between cells and their surroundings that are vital to processes controlling for cell survival, activation, migration, and plasticity. However, increasing evidence suggests that CAMs also mediate mechanisms involved in several neurological diseases. This article reviews the current knowledge on the role of CAMs in amyloid-β (Aβ) metabolism, cell plasticity, neuroinflammation, and vascular changes, all of which are considered central to the pathogenesis and progression of Alzheimer's disease (AD). This paper also outlines the possible roles of CAMs in current and novel AD treatment strategies.
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Affiliation(s)
- Malin Wennström
- Department of Clinical Sciences Malmö, Lund University, Malmö, Sweden,
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15
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Increased tissue factor pathway inhibitor and homocysteine in Alzheimer's disease. Neurobiol Aging 2012; 33:226-33. [DOI: 10.1016/j.neurobiolaging.2010.02.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2009] [Revised: 11/17/2009] [Accepted: 02/19/2010] [Indexed: 12/31/2022]
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16
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Quinn TJ, Gallacher J, Deary IJ, Lowe GDO, Fenton C, Stott DJ. Association between circulating hemostatic measures and dementia or cognitive impairment: systematic review and meta-analyzes. J Thromb Haemost 2011; 9:1475-82. [PMID: 21676170 DOI: 10.1111/j.1538-7836.2011.04403.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
BACKGROUND AND OBJECTIVES Hemostasis and thrombosis may be important contributors to cognitive decline and dementia. Certain blood markers may assist in diagnosis or management. OBJECTIVES To collate evidence for the association of circulating hemostatic variables and dementia or cognitive impairment. METHODS A systematic review of studies describing blood markers of hemostatic function and cognition/dementia. Abstracts were reviewed by two independent assessors and studies selected based on pre-specified criteria. We described methodological quality and performed meta-analyzes where data allowed. RESULTS From 7103 titles, 485 abstracts and included 21 studies (n = 32,773) were assessed. In two longitudinal studies, the incident of vascular dementia risk was greater for higher D-dimer [hazard ratio (HR): 1.50, 95% confidence interval (CI): 1.15-1.96]. For case-control data, we calculated standardized mean differences (SMD) and 95% CI. Higher levels of: factor (F)VII (SMD: 0.93; 95% CI: 0.60-1.26), fibrinogen (SMD: 1.53; 95% CI: 1.17-1.87), prothrombin fragment 1 and 2 (SMD: 0.64; 95% CI: 0.32-0.96), plasminogen activator inhibitor (SMD: 0.68; 95% CI: 0.26-1.10), D-dimer (SMD: 2.00; 95% CI: 1.59-2.40) and von Willebrand factor (VWF) (SMD: 1.68; 95% CI: 1.30-2.06) showed modest but significant associations with vascular dementia. For patients with any dementia diagnosis, associations were with higher D-dimer (SMD: 0.36; 95% CI: 0.15-0.56) and VWF (SMD: 0.31; 95% CI: 0.11-0.51). For specific cognitive domains, significant (P < 0.001) positive correlations were fibrinogen and speed of processing (0.76; 95% CI: 0.67-0.84), verbal memory (0.69; 95% CI: 0.59-0.79) and non-verbal reasoning (0.57; 95% CI: 0.49-0.65). CONCLUSIONS The present results suggest a modest association between hemostasis and vascular dementia including increased levels of thrombin generation markers (D-dimer and prothrombin fragment 1 + 2) and endothelial dysfunction (VWF and plasminogen activator inhibitor). Associations are weaker for specific cognitive tests and when all dementias are combined.
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Affiliation(s)
- T J Quinn
- Institute Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK.
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17
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Yavuz BB, Dede DS, Yavuz B, Cankurtaran M, Halil M, Ulger Z, Cankurtaran ES, Aytemir K, Kabakci G, Haznedaroglu IC, Ariogul S. Potential biomarkers for vascular damage in Alzheimer's disease: thrombomodulin and von Willebrand factor. J Nutr Health Aging 2010; 14:439-41. [PMID: 20617285 DOI: 10.1007/s12603-010-0043-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
OBJECTIVES Evidence regarding the vascular basis of Alzheimer's disease (AD) is growing. In vascular damage thrombomodulin tears of the cell wall and its level increases in the plasma. von Willebrand factor (vWF) is also thought to be a biomarker for vascular damage. The aim of this study was to examine the levels of vWF and thrombomodulin in AD as possible markers for vascular damage and to test their utility as an early biomarker in AD. DESIGN Case-control study. SETTING Geriatric medicine outpatient clinic of a university hospital. PARTICIPANTS Twenty Alzheimer's disease patients free from vascular risk factors and 20 controls were enrolled in the study. MEASUREMENTS Thrombomodulin and VWF levels of 20 AD patients and 20 controls were analyzed by commercial kits. RESULTS Thrombomodulin levels were not different between Alzheimer's disease and control groups [median (range) = 4.25 (2.27-37.00) ng/ml in Alzheimer's disease and 3.55 (2.27-14.00) in control group, p=0.15]. Von Willebrand Factor antigen (%) levels were 188.5 (96-306) in Alzheimer's disease, and 181 (112- 284) in control group (p=0.74). CONCLUSION Although vascular damage is thought to play role in the pathogenesis of AD, vWF and thrombomodulin failed to demonstrate the vascular damage in AD. Their utility to be used as early biomarkers of AD could not be shown.
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Affiliation(s)
- B B Yavuz
- Hacettepe University, Faculty of Medicine, Department of Internal Medicine, Division of Geriatric Medicine, Sihhiye, 06100, Ankara, Turkey.
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18
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Toda N, Ayajiki K, Okamura T. Cerebral blood flow regulation by nitric oxide in neurological disorders. Can J Physiol Pharmacol 2010; 87:581-94. [PMID: 19767882 DOI: 10.1139/y09-048] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
There has been a rapid increase in the amount of information on the physiological and pathophysiological roles of nitric oxide (NO) in the brain. This molecule, which is formed by the constitutive isoforms of NO synthase, endothelial (eNOS) and neuronal (nNOS), plays an obligatory role in the regulation of cerebral blood flow and cell viability and in the protection of nerve cells or fibres against pathogenic factors associated with Alzheimer's disease, Huntington's disease, seizures, and migraine. Cerebral blood flow is impaired by decreased formation of NO from endothelial cells, autonomic nitrergic nerves, or brain neurons and also by increased production of reactive oxygen species (ROS). The NO-ROS interaction is an important topic in discussing blood flow and cell viability in the brain. Excessive production of NO by inducible NOS (iNOS) and nNOS in the brain participates in neurotoxicity. Recent studies on brain circulation have provided useful information about the involvement of impaired NO availability or uncontrolled NO production in cerebral pathogenesis, including Alzheimer's disease, seizures, vascular headaches, and inflammatory disorders. Insight into the role of NO in the brain will contribute to our better understanding of cerebral hemodynamic dysfunction and will aid in developing novel therapeutic measures in diseases of the central nervous system.
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Affiliation(s)
- Noboru Toda
- Toyama Institute for Cardiovascular Pharmacology Research, 7-13, 1-Chome, Azuchi-machi, Chuo-ku, Osaka 541-0052, Japan.
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Zulli R, Nicosia F, Borroni B, Agosti C, Prometti P, Donati P, De Vecchi M, Turini D, Romanelli G, Grassi V, Padovani A. Increased prevalence of silent myocardial ischaemia and severe ventricular arrhythmias in untreated patients with Alzheimer's disease and mild cognitive impairment without overt coronary artery disease. Clin Neurol Neurosurg 2008; 110:791-6. [DOI: 10.1016/j.clineuro.2008.05.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2007] [Revised: 04/28/2008] [Accepted: 05/09/2008] [Indexed: 11/29/2022]
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20
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Xu G, Zhang H, Zhang S, Fan X, Liu X. Plasma fibrinogen is associated with cognitive decline and risk for dementia in patients with mild cognitive impairment. Int J Clin Pract 2008; 62:1070-5. [PMID: 17916180 DOI: 10.1111/j.1742-1241.2007.01268.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
This study was aimed to investigate the relationship between plasma fibrinogen level and risk for cognitive decline and dementia in patients with mild cognitive impairment (MCI). Elderly patients with suspected cognitive impairment were screened and evaluated periodically. One hundred and eighty-five patients who met the criteria for MCI were enrolled. Blood coagulation functions and plasma fibrinogen levels were measured at baseline. Hyperfibrinogenaemia was defined as plasma fibrinogen > or =3.0 g/l. Global cognitive function was assessed serially with Mini-Mental State Examination (MMSE). The enrolled patients were followed for 2 years to observe if dementia was developed. There were 185 patients diagnosed as MCI, of which 17 (9.2%) deceased, 15 (8.1%) lost to follow-up, and 68 (36.8%) developed dementia during follow-up. Mean of MMSE score of the enrolled patients declined significantly during follow-up (22.0 +/- 3.0 vs. 18.1 +/- 5.8, p < 0.001). Patients with hyperfibrinogenaemia at baseline had greater MMSE decrement during follow-up than patients with normal fibrinogen level (-5.4 +/- 5.4 vs. -3.5 +/- 4.5, p < 0.05). Linear regression indicated that plasma fibrinogen level was associated with cognitive decline (R = 0.17, p < 0.05). Patients with hyperfibrinogenaemia had an increased risk for dementia and vascular dementia compared with patients with normal level of plasma fibrinogen (log rank test, p < 0.05). There was a trend that hyperfibrinogenaemia also increased risk for dementia of Alzheimer's type (p = 0.061). It can be concluded that plasma fibrinogen level may be associated with cognitive decline, and hyperfibrinogenaemia may increase risk for dementia in patients with MCI.
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Affiliation(s)
- G Xu
- Department of Neurology, Jinling Hospital, Nanjing University School of Medicine, Nanjing, Jiangsu Province, China
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Abstract
Kidney disease may be linked to a decline in cognitive activity. We examined the association of microalbuminuria and cognitive function in a general population of older adults in the United States drawn from the National Health and Nutrition Examination Survey of 1999-2002. Cognitive function was measured by digit symbol substitution in 2,386 participants 60 years of age and older of whom 448 had microalbuminuria. Covariates included age, gender, race/ethnicity, education, smoking, diabetes, and hypertension. Among participants with peripheral artery disease, those with microalbuminuria had a significantly lower cognitive function score compared to those with a normal albumin-to-creatinine ratio. The association between microalbuminuria and cognitive function was weak in those without peripheral artery disease. But in those with peripheral artery disease, the odds of microalbuminuria associated with cognitive function in the lowest and middle tertiles was 6.5 and 3.5, respectively.
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Zoia CP, Tagliabue E, Isella V, Begni B, Fumagalli L, Brighina L, Appollonio I, Racchi M, Ferrarese C. Fibroblast glutamate transport in aging and in AD: correlations with disease severity. Neurobiol Aging 2005; 26:825-32. [PMID: 15718040 DOI: 10.1016/j.neurobiolaging.2004.07.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2004] [Revised: 05/26/2004] [Accepted: 07/28/2004] [Indexed: 11/22/2022]
Abstract
Altered glutamate transport and aberrant EAAT1 expression were shown in Alzheimer's disease (AD) brains. It is presently unknown whether these modifications are a consequence of neurodegeneration or play a pathogenetic role. However, recent findings of decreased glutamate uptake, EAAT1 protein and mRNA in AD platelets suggest that glutamate transporter modifications may be systemic and might explain the decreased glutamate uptake. We now used primary fibroblast cultures from 10 AD patients to further investigate the specific involvement of glutamate transporters in this disorder and in normal aging. Decreased glutamate uptake (p<0.001), EAAT1 expression (p<0.05) and mRNA (p<0.01) were observed in aged people, compared to younger controls. In AD fibroblasts, compared to age-matched controls, we observed further reductions of glutamate uptake (p<0.0005) and EAAT1 expression (p<0.005), while EAAT1 mRNA increase (p<0.001) was shown. EAAT1 parameters were mutually correlated (p<0.01) and correlations were shown with dementia severity (p<0.05 MMSE-expression, p<0.005 MMSE-mRNA). We suggest fibroblast cultures as possible ex vivo peripheral model to study the glutamate involvement and possible molecular and therapeutic targets in AD.
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Affiliation(s)
- Chiara P Zoia
- Department of Neuroscience and Biomedical Technology, University of Milano-Bicocca, Italy
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Borroni B, Agosti C, Martini G, Volpi R, Brambilla C, Caimi L, Di Luca M, Padovani A. Cholinesterase inhibitors exert a protective effect on endothelial damage in Alzheimer disease patients. J Neurol Sci 2004; 229-230:211-3. [PMID: 15760641 DOI: 10.1016/j.jns.2004.11.030] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
It has been recently suggested that in Alzheimer disease (AD), the current available therapy with cholinesterase inhibitors (ChEIs) influences platelets amyloid precursor protein (APP) metabolism towards the nonamyloidogenic pathway. In order to investigate whether ChEIs may exert a protective role on vascular damage due to abeta deposition, several parameters of coagulation and fibrinolysis were assessed. Twenty patients with mild AD and 30 age-matched controls entered the study. All subjects performed a multidimensional neuropsychological assessment and a laboratory protocol. Individuals with vascular risk factors and systemic diseases were excluded. In mild AD patients, increased levels of markers of endothelial dysfunction, such as thrombomodulin (TM) and sE-selectin (sE-sel), were seen. After 1-month ChEIs treatment, a significant reduction of TM (p<0.05) and sE-sel (p<0.05) values towards the normal range was observed. These findings suggest that endothelial-related ChEIs action might contribute to the clinical efficacy in AD, slowing down pathology progression.
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Affiliation(s)
- Barbara Borroni
- Department of Medical Sciences, Neurological Clinic, University of Brescia, Italy
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Borroni B, Colciaghi F, Lenzi GL, Caimi L, Cattabeni F, Di Luca M, Padovani A. High cholesterol affects platelet APP processing in controls and in AD patients. Neurobiol Aging 2003; 24:631-6. [PMID: 12885570 DOI: 10.1016/s0197-4580(02)00190-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Alzheimer disease (AD) is characterised by a decrease of platelet Amyloid Precursor Protein forms ratio (APPr), which parallels symptoms' severity. Recent studies have suggested that cholesterol might play a role in the pathophysiology of AD by modulating Abeta production. Aim of this study was to evaluate the relationship between serum cholesterol levels and platelet APP processing in controls and AD. Sixty AD patients and 45 age-matched controls (CTRL) were investigated. Neuropsychological assessment, cholesterol dosage and APP forms' evaluation were performed on each subject. CTRL showed lower serum cholesterol levels compared to AD (P<0.01) and higher mean APPr scores (P<0.0001). Hypercholesterolaemic AD patients showed lower APPr scores compared to normocholesterolaemic AD patients matched for disease severity (0.31+/-0.16 versus 0.45+/-0.28; P<0.05), since the early stage of the disease. In AD, cholesterol levels influence APPr independently of disease severity. These findings confirm the association between cholesterol and AD, and suggest that in vivo cholesterol affects APP processing by interfering with its maturation.
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Affiliation(s)
- Barbara Borroni
- Department of Neurology, Clinica Neurologica, c/o Spedali Civili di Brescia, University of Brescia, Brescia, Italy
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