from Part II - Cell Death in Tissues and Organs
Published online by Cambridge University Press: 07 September 2011
Naturally occurring neuronal cell death is common during the development of the nervous system. Depending on the neuronal population, as many as 20% to 80% of all neurons produced during embryogenesis die before the animal reaches adulthood. This regressive event functions to primarily adjust the magnitude of each neuronal population to the size or functional needs of its target field and has been recognized as a major player in establishing the definitive form of adult nervous system. Although immature neurons die physiologically in large numbers during development, mature neurons are among the most long-lived cell types in mammals. Under pathological conditions, mature neurons might activate cell death mechanisms that are known to occur in various acute and chronic neurodegenerative diseases. Pathological neuronal cell death, however, occurs through more diversified pathways than that during development. In this chapter, we review the evidence that supports the role of apoptosis during neuronal development, as well as the possible role of nonapoptotic cell death in the nervous system. We discuss the relevance of different cell death mechanisms in several neurodegenerative diseases and the potential neuroprotective targets for treatment of these diseases.
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