Evidence for a dihydropyridine-sensitive and conotoxin-insensitive release of noradrenaline and uptake of calcium in adrenal chromaffin cells

P. J. Owen, D. B. Marriott, M. R. Boarder

Research output: Contribution to journalArticle

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Abstract

It has been suggested that neuronal voltage-sensitive calcium channels (VSCC) may be divided into dihydropyridine (DHP)-sensitive (L) and DHP-insensitive (N and T), and that both the L and the N type channels are attenuated by the peptide blocker ω-conotoxin. Here the effects of ω-conotoxin on release of noradrenaline and uptake of calcium in bovine adrenal chromaffin cells were investigated. Release of noradrenaline in response to 25 mM K+, 65 mM K+, 10 nM bradykinin or 10 μM prostaglandin E1 was not affected by ω-conotoxin in the range 10 nM-1 μM. 45Ca2+ uptake stimulated by high K+ and prostaglandin was attenuated by 1 μM nitrendipine and enhanced by 1 μM Bay K 8644; these calcium fluxes were not modified by 20 nM ω-conotoxin. With superfused rat brain striatal slices in the same medium as the above cell studies, release of dopamine in response to 25 mM K+ was attenuated by 20 nM ω-conotoxin. These results show that in these neurone-like cells, release may be effected by calcium influx through DHP-sensitive but ω-conotoxin-insensitive VSCC, a result inconsistent with the suggestion the ω-conotoxin blocks both L-type and N-type neuronal calcium channels.

Original languageEnglish
Pages (from-to)133-138
Number of pages6
JournalBritish Journal of Pharmacology
Volume97
Issue number1
DOIs
Publication statusPublished - 1 May 1989
Externally publishedYes

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Conotoxins
Chromaffin Cells
Norepinephrine
Calcium
Calcium Channels
N-Type Calcium Channels
3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester
Nitrendipine
Corpus Striatum
Alprostadil
Bradykinin
1,4-dihydropyridine
Prostaglandins
Dopamine
Neurons
Peptides
Brain

Cite this

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title = "Evidence for a dihydropyridine-sensitive and conotoxin-insensitive release of noradrenaline and uptake of calcium in adrenal chromaffin cells",
abstract = "It has been suggested that neuronal voltage-sensitive calcium channels (VSCC) may be divided into dihydropyridine (DHP)-sensitive (L) and DHP-insensitive (N and T), and that both the L and the N type channels are attenuated by the peptide blocker ω-conotoxin. Here the effects of ω-conotoxin on release of noradrenaline and uptake of calcium in bovine adrenal chromaffin cells were investigated. Release of noradrenaline in response to 25 mM K+, 65 mM K+, 10 nM bradykinin or 10 μM prostaglandin E1 was not affected by ω-conotoxin in the range 10 nM-1 μM. 45Ca2+ uptake stimulated by high K+ and prostaglandin was attenuated by 1 μM nitrendipine and enhanced by 1 μM Bay K 8644; these calcium fluxes were not modified by 20 nM ω-conotoxin. With superfused rat brain striatal slices in the same medium as the above cell studies, release of dopamine in response to 25 mM K+ was attenuated by 20 nM ω-conotoxin. These results show that in these neurone-like cells, release may be effected by calcium influx through DHP-sensitive but ω-conotoxin-insensitive VSCC, a result inconsistent with the suggestion the ω-conotoxin blocks both L-type and N-type neuronal calcium channels.",
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Evidence for a dihydropyridine-sensitive and conotoxin-insensitive release of noradrenaline and uptake of calcium in adrenal chromaffin cells. / Owen, P. J.; Marriott, D. B.; Boarder, M. R.

In: British Journal of Pharmacology, Vol. 97, No. 1, 01.05.1989, p. 133-138.

Research output: Contribution to journalArticle

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