Abstract
We have studied the regulation of the expression of neurotrophin-3 (NT-3) mRNA in neonatal and adult rat muscle spindles after denervation and after denervation followed by reinnervation. Denervation of the intrafusal fibres did not result in an upregulation of the NT-3 mRNA expression but decreased this expression below the detection limit of the in situ hybridization method. Reinnervation of intrafusal fibres restored the NT-3 mRNA expression. The results suggest that the expression of NT-3 mRNA in postnatal muscle spindles is controlled by neuronal factors. The intrafusal fibre derived NT-3 may act as an instructive, feedback messenger for innervating neurons and may play a role in stabilizing and maintaining functional neuromuscular connections. (C) 1997 Elsevier Science Ireland Ltd.
| Original language | English |
|---|---|
| Pages (from-to) | 41-44 |
| Number of pages | 4 |
| Journal | Neuroscience Letters |
| Volume | 236 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 24-Oct-1997 |
Keywords
- neurotrophin-3 mRNA
- muscle spindles
- neurotrophic factors
- proprioception
- intrafusal fibres
- axotomy
- MOTOR-NEURON SURVIVAL
- NERVE GROWTH-FACTOR
- SKELETAL-MUSCLE
- NEONATAL RATS
- SPINDLES
- MOTONEURONS