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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Turner, T. J. Adams, M. E. Dunlap, K. |
| Description | Author Affiliation: Turner TJ ( Department of Physiology, Tufts University School of Medicine, Boston, MA 02111.); |
| Abstract | The regulation of excitation-secretion coupling by Ca2+ channels is a fundamental property of the nerve terminal. Peptide toxins that block specific Ca2+ channel types have been used to identify which channels participate in neurotransmitter release. Subsecond measurements of [3H]-glutamate and [3H]dopamine release from rat striatal synaptosomes showed that P-type channels, which are sensitive to the Agelenopsis aperta venom peptide omega-Aga-IVA, trigger the release of both transmitters. Dopamine (but not glutamate) release was also controlled by N-type, omega-conotoxin-sensitive channels. With strong depolarizations, where neither toxin was very effective alone, a combination of omega-Aga-IVA and omega-conotoxin produced a synergistic inhibition of 60-80% of Ca(2+)-dependent dopamine release. The results suggest that multiple Ca2+ channel types coexist to regulate neurosecretion under normal physiological conditions in the majority of nerve terminals. P- and N-type channels coexist in dopaminergic terminals, while P-type and a omega-conotoxin- and omega-Aga-IVA-resistant channel coexist in glutamatergic terminals. Such an arrangement could lend a high degree of flexibility in the regulation of transmitter release under diverse conditions of stimulation and modulation. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 20 |
| Volume Number | 90 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1993-11-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Calcium Channel Blockers Pharmacology Calcium Channels Physiology Corpus Striatum Metabolism Dopamine Glutamates Mollusk Venoms Peptides Spider Venoms Animals Calcium In Vitro Techniques Synaptic Transmission Drug Effects Synaptosomes Omega-Agatoxin IVA Omega-Conotoxin GVIA Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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