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Title:	Falla mitocondrial oxidativa inducida por estrés y sustancias vasoactivas como los iniciadores dominantes de la patología favorecen la reclasificación de la enfermedad de Alzheimer como una Vasocognopatía Oxidative stress-induced mitochondrial failure and vasoactive substances as key initiators of pathology favor the reclassification of Alzheimer Disease as a vasocognopathy
metadata.dc.creator:	Aliev, Gjumrakch Lamanna, Joséph Charles Morales Álvarez, Ludis Obrenovich, Mark Eric Pacheco, Gerardo Jesús Palacios, Hector Qasimov, Eldar Walrafen, Brianna
Keywords:	brain hypoperfusion;mitochondria;neurodegeneration;nitric oxide;oxidation;oxidative stress;vasoactive substances.;brain hypoperfusion;mitochondria;neurodegeneration;nitric oxide;oxidation;oxidative stress;vasoactive substances.
Publisher:	Universidad Colegio Mayor de Cundinamarca
metadata.dc.relation:	https://hemeroteca.unad.edu.co/index.php/nova/article/view/408/1147
metadata.dc.format.*:	application/pdf
metadata.dc.type:	info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion reviewArticle reviewArticle reviewArticle
Description:	Alzheimer disease and cerebrovascular accident are two leading causes of age-related dementia. Increasing evidence supports the idea that chronic hypoperfusion is primarily responsible for the pathogenesis that underlies both disease processes. Hypoperfusion is associated with oxidative imbalance, largely due to reactive oxygen species, which is associated with other age-related degenerative disorders. Recent evidence indicates that a chronic injury stimulus induces the hypoperfusion seen in the microcirculation of vulnerable regions of the brain. This leads to energy failure, manifested by damaged mitochondrial ultrastructure. Mitochondrial derangements lead to the formation of a large number of electron-dense, “hypoxic” mitochondria and cause the overproduction of mitochondrial DNA (mtDNA) deletions, which is most likely due to double stranded breaks. Additionally, these mitochondrial abnormalities coexist with increased redox metal activity, lipid peroxidation, and RNA oxidation, all of which are well established features of Alzheimer disease pathology, prior to the appearance of amyloid b deposition.Alzheimer disease, oxidative stress occurs within various cellular compartments and within certain cell types more than others, namely the vascular endothelium, which is associated with atherosclerotic damage, as well as in pyramidal neurons and glia. Interestingly, these vulnerable cells show mtDNA deletions and oxidative stress markers only in the regions that are closely associated with damaged vessels. This evidence strongly suggests that chronic hypoperfusion induces the accumulation of the oxidative stress products. Furthermore, brain vascular wall lesions linearly correlate with the degree of neuronal and glial cell damage. We, therefore, conclude that chronic hypoperfusion is a key initiator of oxidative stress in various brain parenchymal cells, and the mitochondria appear to be primary targets for brain damage in Alzheimer disease. In this manuscript, we outline a role for the continuous accumulation of oxidative stress products, such as an abundance of nitric oxide products (via the overexpression of inducible and/or neuronal NO synthase (iNOS and nNOS respectively) and peroxynitrite accumulation, as secondary but accelerating factors compromising the blood brain barrier (BBB). If this turns out to be the case, pharmacological interventions that target chronic hypoperfusion might ameliorate the key features of dementing neurodegeneration. Alzheimer disease and cerebrovascular accident are two leading causes of age-related dementia. Increasing evidence supports the idea that chronic hypoperfusion is primarily responsible for the pathogenesis that underlies both disease processes. Hypoperfusion is associated with oxidative imbalance, largely due to reactive oxygen species, which is associated with other age-related degenerative disorders. Recent evidence indicates that a chronic injury stimulus induces the hypoperfusion seen in the microcirculation of vulnerable regions of the brain. This leads to energy failure, manifested by damaged mitochondrial ultrastructure. Mitochondrial derangements lead to the formation of a large number of electron-dense, ¿hypoxic¿ mitochondria and cause the overproduction of mitochondrial DNA (mtDNA) deletions, which is most likely due to double stranded breaks. Additionally, these mitochondrial abnormalities coexist with increased redox metal activity, lipid peroxidation, and RNA oxidation, all of which are well established features of Alzheimer disease pathology, prior to the appearance of amyloid b deposition. Alzheimer disease, oxidative stress occurs within various cellular compartments and within certain cell types more than others, namely the vascular endothelium, which is associated with atherosclerotic damage, as well as in pyramidal neurons and glia. Interestingly, these vulnerable cells show mtDNA deletions and oxidative stress markers only in the regions that are closely associated with damaged vessels. This evidence strongly suggests that chronic hypoperfusion induces the accumulation of the oxidative stress products. Furthermore, brain vascular wall lesions linearly correlate with the degree of neuronal and glial cell damage. We, therefore, conclude that chronic hypoperfusion is a key initiator of oxidative stress in various brain parenchymal cells, and the mitochondria appear to be primary targets for brain damage in Alzheimer disease. In this manuscript, we outline a role for the continuous accumulation of oxidative stress products, such as an abundance of nitric oxide products (via the overexpression of inducible and/or neuronal NO synthase (iNOS and nNOS respectively) and peroxynitrite accumulation, as secondary but accelerating factors compromising the blood brain barrier (BBB). If this turns out to be the case, pharmacological interventions that target chronic hypoperfusion might ameliorate the key features of dementing neurodegeneration.
metadata.dc.source:	NOVA Biomedical Sciences Journal; Vol. 6 No. 10 (2008); 170-189 Nova; Vol. 6 Núm. 10 (2008); 170-189 NOVA Ciências Biomédicas Publicação; v. 6 n. 10 (2008); 170-189 2462-9448 1794-2470
URI:	https://repository.unad.edu.co/handle/10596/33009
Other Identifiers:	https://hemeroteca.unad.edu.co/index.php/nova/article/view/408 10.22490/24629448.408
Appears in Collections:	Revista Nova

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