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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kasai, H. |
| Description | Author Affiliation: Kasai H ( Abteilung Membranbiophysik, Max-Planck-Institut für Biophysikalische Chemie, Göttingen, Federal Republic of Germany.); |
| Abstract | A significant fraction of differentiated NG108-15 neuroblastoma/glioma cells have Ca2+ channel current different from that of undifferentiated cells. In the former cells, the Ca2+ channel sensitive to omega-conotoxin GVIA had slowed activation kinetics and was facilitated by depolarizing prepulses. These kinetic features are identical to those produced by inhibition of the channel by G proteins. Prolonged treatment with prostaglandin E1 and theophylline, agents that cause cellular differentiation, promoted incidence and extent of the tonic inhibition. Intracellular guanosine 5'-[beta-thio]diphosphate removed the tonic inhibition, suggesting sustained activation of a G protein, but pertussis toxin did not block it. A sulfhydryl alkylating agent, N-ethylmaleimide (0.1 mM), rapidly eliminated agonist-induced inhibition, whereas N-ethylmaleimide spared the tonic inhibition and the one induced by intracellular guanosine 5'-[gamma-thio]triphosphate. An agonist could further inhibit the Ca2+ channel that was already tonically inhibited. After washout of an inhibitory agonist, the tonic inhibition was temporarily removed. This 'rebound facilitation' gradually faded within a few minutes. Pertussis toxin or N-ethylmaleimide prevented the rebound facilitation, whereas phorbol ester, forskolin, or arachidonic acid induced neither the rebound facilitation nor the tonic inhibition. Whatever its mechanism, the tonic inhibition of Ca2+ channels may serve as the basis for long-term and bidirectional regulation of activity of neuronal Ca2+ channels. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 19 |
| Volume Number | 88 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1991-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Calcium Channels Physiology GTP-Binding Proteins Neurons Animals Drug Effects Enkephalin, D-Penicillamine (2,5)- Enkephalins Pharmacology Ethylmaleimide In Vitro Techniques Membrane Potentials Mollusk Venoms Neuroblastoma Peptides, Cyclic Pertussis Toxin Tumor Cells, Cultured Virulence Factors, Bordetella Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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