Abstract:
:The ability of perisynaptic glial cells to modulate transmitter release and synaptic depression was studied at the frog neuromuscular junction (nmj). Injection of GTPgammaS in perisynaptic Schwann cells (PSCs), glial cells at this synapse, induced a reduction in the amplitude of nerve-evoked synaptic responses but had no effect on the frequency, the amplitude, or the duration of the miniature endplate currents (MEPCs). Also, paired pulse facilitation was not affected. The reduction in transmitter release was mediated by pertussis toxin-(PTX) sensitive and insensitive G proteins. Blockade of G proteins in PSCs with GDPbetaS reduced synaptic depression induced by high frequency trains of stimuli, whereas activation of G proteins occluded it. Hence, the activation by endogenous neurotransmitters of G proteins in PSCs induced a profound depression in neurotransmitter release.
journal_name
Neuronjournal_title
Neuronauthors
Robitaille Rdoi
10.1016/s0896-6273(00)80600-5subject
Has Abstractpub_date
1998-10-01 00:00:00pages
847-55issue
4eissn
0896-6273issn
1097-4199pii
S0896-6273(00)80600-5journal_volume
21pub_type
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