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. 1995 Jul 18;92(15):6938–6942. doi: 10.1073/pnas.92.15.6938

Amperometric detection of stimulus-induced quantal release of catecholamines from cultured superior cervical ganglion neurons.

Z Zhou 1, S Misler 1
PMCID: PMC41446  PMID: 7624348

Abstract

Amperometry has been used for real-time electrochemical detection of the quantal release of catecholamines and indolamines from secretory granules in chromaffin and mast cells. Using improved-sensitivity carbon fiber electrodes, we now report the detection of quantal catecholamine release at the surface of somas of neonatal superior cervical ganglion neurons that are studded with axon varicosities containing synaptic vesicles. Local application of a bath solution containing high K+ or black widow spider venom, each of which greatly enhances spontaneous quantal release of transmitter at synapses, evoked barrages of small-amplitude (2-20 pA), short-duration (0.5-2 ms) amperometric quantal "spikes". The median spike charge was calculated as 11.3 fC. This figure corresponds to 3.5 x 10(4) catecholamine molecules per quantum of release, or approximately 1% that evoked by the discharge of the contents of a chromaffin granule.

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Selected References

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