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Neurochemical Aspects of Neurotraumatic and Neurodegenerative Diseases (Hardcover, 2010 ed.)
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Neurochemical Aspects of Neurotraumatic and Neurodegenerative Diseases (Hardcover, 2010 ed.)
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Collectively, neurodegenerative diseases are characterized by
chronic and progressive loss of neurons in discrete areas of the
brain, producing debilitating symptoms such as dementia, loss of
memory, loss of sensory or motor capability, decreased overall
quality of life eventually leading to premature death. Two types of
cell death are known to occur during neurodegeneration: (a)
apoptosis and (b) necrosis. The necrosis is characterized by the
passive cell swelling, intense mitochondrial damage with rapid loss
of ATP, alterations in neural membrane permeability, high calcium
influx, and disruption of ion homeostasis. This type of cell death
leads to membrane lysis and release of intracellular components
that induce inflammatory reactions. Necrotic cell death normally
occurs at the core of injury site. In contrast, apoptosis is an
active process in which caspases (a group of endoproteases with
specificity for aspartate residues in protein) are stimulated.
Apoptotic cell death is accompanied by cell shrinkage, dynamic
membrane blebbing, chromatin condensation, DNA laddering, loss of
phospholipids asymmetry, low ATP levels, and mild calcium overload.
This type of cell death normally occurs in penumbral region at the
ischemic injury site and in different regions in various
neurodegenerative diseases.
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