Spatial and temporal expression of acetylcholine receptor RNAs in innervated and denervated rat soleus muscle.

Neuron
D Goldman, J Staple

Abstract

In adult vertebrate skeletal muscle acetylcholine receptors are localized to the neuromuscular junction. Upon denervation, this distribution changes, with new receptors appearing in extrajunctional regions of the muscle fiber. The location of acetylcholine receptors in innervated or denervated muscle may result, in part, from the distribution of their RNAs. This was tested by assaying for receptor RNAs in junctional and extrajunctional regions of innervated and denervated rat soleus muscle using in situ hybridization and RNAase protection assays. These experiments showed alpha, beta, and delta subunit RNAs concentrated beneath the endplates of innervated muscle fibers. Following denervation, there was an unequal distribution of receptor RNAs along the muscle fiber, with highest levels occurring in extrajunctional regions near the endplate. These data are consistent with a nonuniform pattern of gene expression in adult skeletal muscle fibers.

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