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By
Sabina Sperandio, Buck Institute for Age Research, Novato, CA,
Ian deBelle, Burnham Institute, La Jolla, CA,
Susana Castro-Obregon, Buck Institute for Age Research, Novato, CA,
Gabriel del Rio, Buck Institute for Age Research, Novato, CA,
Dale E. Bredesen, Buck Institute for Age Research, Novato, CA; Department of Neurology, University of California, San Francisco, San Francisco, CA
Edited by
Pak H. Chan, Stanford University, California
Extensive research over the past several years has led to the elucidation of genetic and biochemical pathways involved in apoptosis (from the Greek apo = away from, and ptosis = falling), which is often referred to as the program for cell death. Concurrently, studies in stroke and degenerative diseases have sought to address the underlying mechanisms of neural cell death in these disease states. Interestingly, initial attempts to map the results from apoptosis mechanistic studies onto the patterns observed in neurological diseases have resulted in something of a paradox. On the one hand, the expression of genes associated with neurodegenerative diseases, such as mutants of sod 1 associated with amyotrophic lateral sclerosis or mutants of β-amyloid precursor protein associated with Alzheimer's disease, has been shown to induce apoptosis in cultured cells; on the other hand, studies in vivo have not disclosed classic apoptosis as the major route of neuronal cell death in any of the major neurodegenerative diseases. Initially, it was thought that this may simply be because the rate of cell death in neurodegenerative diseases is slow enough that it is difficult to capture enough neurons in the act of apoptosis (which is typically a relatively rapid program, occurring over minutes to a few hours in cultured cells) to demonstrate a clear increase in disease states.
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