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Developmental changes in spinal cord neurite-promoting activity from chick muscle extracts
1Department of Anatomical Sciences, School of Life Sciences, University of Illinois, Urbana 61801.
Brain Research
|May 1, 1988
Summary
Muscle extracts from embryonic chicks promote spinal cord neurite growth. The highest promotion of neurite initiation was observed using 18-day embryonic chick muscle extract, suggesting key developmental roles.
Area of Science:
- Developmental biology
- Neuroscience
- Cell biology
Background:
- Neurite outgrowth is crucial for neural network formation.
- The role of embryonic muscle-derived factors in neuronal development is not fully understood.
Purpose of the Study:
- To investigate the effect of embryonic chick muscle extracts on spinal cord neurite initiation.
- To identify the developmental stage of muscle tissue that produces neurite-promoting factors.
Main Methods:
- Preparation of muscle extracts from embryonic chicks at various developmental stages (10-18 days).
- Treatment of 6-day embryo spinal cord explants with muscle extracts.
- Assessment of neurite initiation and outgrowth.
Main Results:
- Muscle extracts from embryonic chicks aged 10-18 days significantly increased spinal cord neurite initiation.
- Maximal neurite-promoting activity was observed with extracts from 18-day-old embryos.
- Extracts from older chicks (beyond 18 days) showed no significant effect.
Conclusions:
- Embryonic muscle tissue produces factors that promote spinal cord neurite initiation.
- These factors are likely involved in the formation and stabilization of neuromuscular junctions during embryonic development.
- The identified neurite-promoting factors may regulate axonal branching and maintenance.