On the basis of the specific [3H]quinuclidinyl-benzilate binding, the transport of muscarinic cholinergic receptors has been demonstrated in the ventral horn, sciatic nerve and in the 3 mm segments proximal and distal to the ligature of rat sciatic nerves ligated for 24 h (a) without electrolytic lesion, (b) six days after lesion of the spinal ganglia, (c) six days after lesion of the motoric axons, and (d) six days after transection of the sciatic nerve. The distribution of these receptors was also studied in the ventral spinal horn, dorsal root sensory axons, spinal ganglia and sciatic nerve of rabbit. Our results suggest that the receptors are transported in the sciatic nerve of rat. This transport consists of a large anterograde, and a discrete retrograde flow of muscarinic cholinergic receptors. Most of the receptors are possibly synthesized in the motoneuron cell bodies and migrate in the motoric axons; to a lesser extent they may also be synthesized in the cell bodies of the dorsal root ganglia and migrate in the sensory axons of the sciatic nerve. © 1984.
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