Enhancement by GABA of the stimulation-evoked catecholamine release from cultured bovine adrenal chromaffin cells

Summary The possible involvement of GABAergic mechanisms in the catecholamine (CA) release from adrenal medulla was investigated in a primary culture of bovine adrenal chromaffin cells. GABA elicited CA release and enhanced acetylcholine (ACh)-, excess K⁺-and veratridine-evoked CA release. Muscimol, a selective GABA_A receptor agonist, mimicked the action of GABA on CA release. On the other hand, baclofen, a GABA_B receptor agonist, failed to affect basal or evoked CA release. Furthermore, bicuculline and picrotoxin blocked the enhancement by GABA of veratridine-evoked CA release without affecting basal CA release and CA release evoked by veratridine. In Ca²⁺-free medium, GABA failed to affect basal and caffeine-evoked CA release. ACh-evoked CA release was slightly reduced by bicuculline, whereas excess K⁺-evoked CA release was not, suggesting the involvement of endogenous GABA in CA release evoked by ACh. These results suggest a facilitatory modulation by GABA of basal and evoked release of CA from bovine adrenal medulla through GABA_A receptor-mediated mechanisms.Send offprint requests to A. Tsujimoto at the above address