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Evoked neuronal secretion of false transmitters
1Department of Biological Sciences, Columbia University, New York, New York 10027.
Neuron
|October 1, 1994
Summary
Differentiated neurons can secrete multiple neurotransmitters when supplied with sufficient cytoplasmic concentrations. This study demonstrates neurons
Area of Science:
- Neuroscience
- Cell Biology
- Neurotransmission
Background:
- Differentiated neurons typically secrete specific neurotransmitters based on their lineage.
- The capacity for neurons to secrete non-native transmitters is not fully understood.
Purpose of the Study:
- To investigate whether differentiated neurons can secrete exogenous (false) transmitters.
- To determine the mechanism and conditions under which such secretion occurs.
Main Methods:
- Whole-cell recording pipettes were used to load exogenous neurotransmitters (glutamate or acetylcholine) into neuronal cytoplasm.
- Depolarization was induced to evoke transmitter release.
- Secretion was detected using acutely dissociated target neurons (hippocampal pyramidal neurons or myocytes).
- Calcium dependency and vesicular nature of secretion were assessed.
Main Results:
- Cholinergic Xenopus spinal neurons secreted loaded glutamate upon depolarization.
- Glutamatergic hippocampal neurons secreted loaded acetylcholine (ACh) upon depolarization.
- Evoked secretion of these false transmitters was calcium-dependent and vesicular.
Conclusions:
- Differentiated neurons possess the intrinsic machinery to package and secrete multiple nonpeptide transmitters.
- The availability of sufficient cytoplasmic transmitter concentrations is a key factor enabling this multi-transmitter secretion.
- This finding broadens the understanding of neuronal plasticity and neurotransmitter systems.
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