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Motor nerve sprouting and acetylcholine receptors.
Science (New York, N.Y.)
|March 17, 1978
Summary
Motor nerve terminal sprouting in skeletal muscles is triggered by denervation. Increased extrajunctional acetylcholine receptors correlate with sprouting, which is inhibited by acetylcholine receptor blockade, suggesting their crucial role.
Area of Science:
- Neuroscience
- Muscle Physiology
- Cell Biology
Background:
- Motor nerve terminals innervate skeletal muscles, ensuring function.
- Denervation or disuse can lead to functional changes in muscle and nerve.
- Acetylcholine receptors are crucial for neuromuscular transmission.
Purpose of the Study:
- To investigate the mechanisms underlying motor nerve terminal sprouting.
- To determine the role of extrajunctional acetylcholine receptors in this process.
Main Methods:
- Functional denervation of skeletal muscles using presynaptic blockade or disuse.
- Morphometric measurement of motor nerve terminal sprouting.
- Correlation analysis between sprouting and extrajunctional acetylcholine receptor levels.
- Inhibition studies using alpha-bungarotoxin to block acetylcholine receptors.
Main Results:
- Functional denervation successfully evoked motor nerve terminal sprouting.
- The extent of sprouting was directly correlated with the level of extrajunctional acetylcholine receptors.
- Blockade of acetylcholine receptors with alpha-bungarotoxin inhibited sprouting.
Conclusions:
- Extrajunctional acetylcholine receptors are implicated in the initiation of motor nerve terminal sprouting.
- These receptors may play a significant role in nerve plasticity following denervation or disuse.