Glia cell line-derived neurotrophic factor regulates the distribution of acetylcholine receptors in mouse primary skeletal muscle cells
Abstract
It was recently reported that glia cell line-derived neurotrophic factor (GDNF) facilitates presynaptic axonal growth and neurotransmitter release at neuromuscular synapses. Little is known, however, whether GDNF can also act on the postsynaptic apparatus and its underlying mechanisms. Using biochemical cold blocking of existing membrane acetylcholine receptors (AchRs) and biotinylation of newly inserted receptors we demonstrate that GDNF increases the insertion of AChRs into the surface membrane of mouse primary cultured muscle cells and that this does not require protein synthesis. Quantitative data from double-label imaging indicate that GDNF induces a quick and substantial increase in AchR insertion as well as lateral movement into AchR aggregates, relative to a weak effect on reducing the loss of receptors from pre-existing AchR aggregates, which in contrast to the effect of PMA. These effects occur in both innervated and un-innervated muscles, and GDNF affects nerve-muscle co-cultures more than it affects muscle-only cultures. Neurturin, another member of GDNF-family ligands has similar effects on AchRs as GDNF but the unrelated growth factor, EGF does not. Studies on protein phosphorylation and specific inhibitors of cel...Continue Reading
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