Mechanisms of neural cell death: implications for development of neuroprotective treatment strategies.
It has been increasingly recognized that cell death phenotypes and their molecular mechanisms are highly diverse. Necrosis is no longer considered a single entity, passively mediated by energy failure. Moreover, caspase-dependent apoptosis is not the only pathway involved in programmed cell death or even the only apoptotic mechanism. Recent experimental work emphasizes the diverse and interrelated nature of cell death mechanisms. Thus, there are both caspase-dependent and caspase-independent forms of apoptosis, which may differ morphologically as well as mechanistically. There are also necrotic-like phenotypes that require de novo protein synthesis and are, therefore, forms of programmed cell death. In addition, forms of cell death showing certain morphological features of both necrosis and apoptosis have been identified, leading to the term aponecrosis. Considerable experimental evidence also shows that modulation of one form of cell death may lead to another. Together, these observations underscore the need to substantially revise our conceptions about neuroprotection strategies. Use of multiple treatments that target different cell death cascades, or single agents that moderate multiple cell death pathways, is likely to lead to more effective neuroprotection for clinical disorders.
Yakovlev
Alexander G
AG
Department of Neuroscience, Georgetown University Medical Center, Washington, DC 20057, USA.
Faden
Alan I
AI
D000818:Animals; D001921:Brain / Q000473:pathology*; D016923:Cell Death / Q000502:physiology*; D006801:Humans; D009474:Neurons / Q000473:pathology*; D018696:Neuroprotective Agents
D018696:Neuroprotective Agents
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