Key result
Hypertonic Ringer solution raises min epp frequency and reduces amplitude at frog neuromuscular junctions.
Population
Frog neuromuscular junction
Comparison
Alterations in the tonicity of the Ringer solution vs Normal Ringer solution / initial solution
Design
Preclinical
Authors
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Hypothesis-generating for osmotic effects on release; leaves open translation to mammalian synapses.
Changes in tonicity rapidly alter acetylcholine release at the frog neuromuscular junction, with hypertonic solutions increasing min epp frequency and decreasing epp amplitude, challenging existing theories of osmotic effects on synaptic function.
Kita et al. (1977) studied this question. Changes in tonicity of the Ringer solution vs. Normal Ringer solution was evaluated on Miniature end-plate potential (min epp) frequency and epp amplitude. Increasing the tonicity of the Ringer solution at the frog neuromuscular junction caused a rapid, sustained increase in miniature end-plate potential frequency and a decrease in epp amplitude.
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