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Why do neurons die when deprived of trophic factor?
E M Johnson1, J Y Chang, T Koike
1Department of Pharmacology, Washington University Medical School, St. Louis, MO 63110.
Neurobiology of Aging
|September 1, 1989
Summary
Neuronal death from trophic factor loss may be an active "suicide program" requiring gene expression, not passive cell death. This active process could be involved in neurodegenerative diseases.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Neuronal death occurs following trophic factor deprivation, such as axotomy or target loss.
- Traditionally, this cell death has been viewed as a passive consequence of reduced trophic stimulation.
Purpose of the Study:
- To present evidence supporting an alternative hypothesis for neuronal death.
- To propose that neuronal death is an active, programmed process requiring gene expression.
Main Methods:
- This commentary reviews existing evidence and proposes a hypothesis.
- It discusses the potential mechanistic links between neuronal death and other cell death processes.
Main Results:
- Circumstantial evidence suggests neuronal death is not passive but actively regulated.
- This active process requires messenger RNA (mRNA) and protein synthesis, akin to a cellular suicide program.
Conclusions:
- If the active death hypothesis is correct, dysregulation of this program may contribute to neuronal loss in aging and neurodegenerative conditions.
- Understanding this active cell death pathway could offer new therapeutic targets for neurological disorders.