Journal of Neuroscience, Vol 4, 2346-2349, Copyright © 1984 by Society for Neuroscience
Redistribution of acetylcholine receptors on developing rat myotubes
L Ziskind-Conhaim, I Geffen and ZW Hall
The mechanism of formation of acetylcholine receptor (AChR) clusters at
developing mammalian endplates was investigated in vitro, using intercostal
muscles from embryonic rats. The muscles were explanted in organ culture
with the spinal cord attached, as described previously (Ziskind-Conhaim,
L., and M. J. Dennis (1981) Dev. Biol. 85: 243-251). AChRs on the myofibers
were labeled with [125I]-alpha-bungarotoxin shortly before clusters
appeared and subsequently were cultured in unlabeled toxin for 1 day.
Autoradiography of the cultured fibers demonstrated the presence of labeled
clusters of AChRs indicating that the AChRs in the newly formed clusters
arise from AChRs that had previously been uniformly distributed on the
muscle surface.