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Cysteine sulfinate modulated calcium permeability in synaptosomes from rat brain
1Department of Biochemistry and Biophysics, Medical School, University of Pennsylvania, Philadelphia 19104-6059.
Neuroscience Letters
|November 10, 1987
Summary
Cysteine sulfinate (CSA) increases calcium permeability in rat brain synaptosomes via specific receptors. High CSA concentrations suggest it
Area of Science:
- Neuroscience
- Biochemistry
- Cell Biology
Background:
- Synaptosomes are crucial for studying neurotransmission and calcium signaling.
- Calcium influx plays a vital role in neuronal function and excitability.
Purpose of the Study:
- To investigate the effect of cysteine sulfinate (CSA) on calcium permeability in rat brain synaptosomes.
- To characterize the mechanism and receptor specificity of CSA-induced calcium entry.
Main Methods:
- Isolation of synaptosomes from rat brain.
- Measurement of 45Ca2+ influx in response to CSA.
- Analysis of calcium entry pathways, distinguishing from known channels and exchangers.
Main Results:
- Cysteine sulfinate (CSA) significantly increased 45Ca2+ permeability across the synaptosomal plasma membrane.
- The observed calcium entry utilized a distinct system, separate from voltage-dependent Ca2+ channels and Na+/Ca2+ exchange.
- CSA's effect was mediated by specific, saturable receptors, but required high mM concentrations.
Conclusions:
- Cysteine sulfinate (CSA) modulates calcium permeability in brain synaptosomes through a novel receptor-mediated pathway.
- The high concentrations of CSA needed suggest it may not be the endogenous physiological agonist.
- Further research is needed to identify the specific receptors and physiological relevance of CSA in calcium signaling.