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pubmed-article:1853784pubmed:abstractTextBecause embryonic neurons are more sensitive to the effects of target derived factors than adult neurons, the developing nervous system provides a sensitive model for investigating the in vivo actions of target-derived growth factors. We have used the developing chick embryo to document that skeletal muscle contains substances that selectively enhance the in vivo survival of motor neurons. We have also shown that a single purified skeletal muscle protein (CDF) is capable of rescuing motor neurons during the period of naturally occurring cell death. The rescue of motor neurons in vivo by CDF is consistent with the hypothesis that distinct neurotrophic factors exist which regulate the timing and extent of the naturally occurring death of specific populations of neurons. The effects of CDF appear to be specific for cholinergic somatic motor neurons, since the survival of other types of spinal cord neurons, which also exhibit cell loss during the treatment period, was not affected by CDF treatment. In contrast, treatment of the embryos with extracts of tissues not innervated by motor neurons, or with NGF or bFGF, does not affect motor neuron survival. Thus the ability to rescue motor neurons during the period of cell death appears to be a distinct property of CDF and provides indirect evidence that this molecule may play a role in the survival and development of motor neurons. The role of neurotrophic factor involvement in the pathophysiology of degenerative diseases such as ALS remains entirely speculative. However, the demonstration that such factors affect the neuronal subtypes at risk in these diseases provides experimental support for this possibility.(ABSTRACT TRUNCATED AT 250 WORDS)lld:pubmed
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pubmed-article:1853784pubmed:pagination81-8lld:pubmed
pubmed-article:1853784pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:1853784pubmed:year1991lld:pubmed
pubmed-article:1853784pubmed:articleTitleSkeletal muscle proteins rescue motor neurons from cell death in vivo.lld:pubmed
pubmed-article:1853784pubmed:affiliationWagner ALS Research Laboratory, Jerry Lewis Neuromuscular Disease Research Center, Baylor College of Medicine, Houston, Texas.lld:pubmed
pubmed-article:1853784pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:1853784pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:1853784pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed