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[Catecholamine secretion from adrenal chromaffin cells].

M Oka1, K Morita, M Yoshizumi

  • 1Department of Pharmacology, Tokushima University School of Medicine, Japan.

Nihon Yakurigaku Zasshi. Folia Pharmacologica Japonica
|September 1, 1991
PubMed
Summary

Palytoxin (PTX) triggers catecholamine (CA) secretion from adrenal cells by activating specific ion channels. Flavonoids like quercetin and apigenin inhibit this secretion, potentially via protein kinase C (PKC) pathways.

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Area of Science:

  • Neuropharmacology
  • Cell Physiology

Background:

  • Catecholamine (CA) secretion is crucial for physiological responses.
  • Palytoxin (PTX) is a potent marine toxin with known cellular effects.

Purpose of the Study:

  • To investigate the mechanism of PTX-induced CA secretion from bovine adrenal chromaffin cells.
  • To explore the effects of flavonoids on CA secretion.

Main Methods:

  • Cultured bovine adrenal chromaffin cells were treated with PTX.
  • Ion influxes ([22Na]+ and [45Ca]2+) were measured.
  • The effects of various inhibitors (TTX, quinidine, aprindine, nifedipine, verapamil, amiloride) were assessed.
  • CA secretion from permeabilized cells was examined with and without flavonoids (quercetin, apigenin) and phorbol ester TPA.

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Main Results:

  • PTX induced CA secretion in a concentration-dependent manner.
  • PTX increased [22Na]+ and [45Ca]2+ influxes, independent of TTX.
  • Quinidine, aprindine, and Ca2+ channel blockers inhibited PTX-induced CA secretion and [45Ca]2+ influx.
  • Amiloride inhibited PTX-induced [22Na]+ influx, suggesting Na+-H+ exchange involvement.
  • Flavonoids quercetin and apigenin inhibited CA secretion from permeabilized cells and TPA-induced secretion.

Conclusions:

  • PTX-induced CA secretion is mediated by Na+-dependent, TTX-insensitive voltage-dependent Ca2+ channels.
  • Flavonoids inhibit CA secretion, likely through inhibition of protein kinase C (PKC).