Abstract
The ATP-induced increase in tritium outflow from cultured chick sympathetic neurons prelabelled with [3H]-noradrenaline was investigated.
Seven days-old dissociated cell cultures of embryonic paravertebral ganglia, loaded with [3H]-noradrenaline (0.05 μM), were superfused in the presence of (+)-oxaprotiline and exposed to ATP, ATP-analogues, or 1,1-dimethyl-4-piperazinium (DMPP) for 2 min. ATP (3 μLM-3 mM), 2-methylthio-ATP (3–100 μM), as well as DMPP (10 and 100 μM) induced a significant overflow of tritium. The EC50-value of ATP was 20 μM. Both the ATP-induced and the DMPP-induced tritium overflow was Ca2+-dependent and sensitive to tetrodotoxin (0.3 μM) and ω-conotoxin (0.1 μM); in addition, it was inhibited by the α2-adrenoceptor agonist 5-bromo-6-(2-imidazoline-2-ylamino)-quinoxaline (UK-14,304; 1 μM). The effects of ATP and DMPP were not additive. The ATP-induced as well as the DMPP-induced overflow of tritium was diminished by the P2-purinoceptor antagonists suramin (300 μM) and reactive blue 2 (3 μM); in all 4 cases, the inhibition amouted to approximately 40%. The tritium overflow induced by ATP or DMPP was almost abolished by the nicotinic receptor antagonist mecamylamine (10 μM) and markedly inhibited by hexamethonium (100 μM). Neither ATP nor electrical stimulation caused an overflow of tritium from cultures loaded with [3H]-choline.
The results suggest that ATP at μmolar concentrations induces noradrenaline release from cultured chick sympathetic neurons via an action on a subclass of the nicotinic cholinoceptor.
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Allgaier, C., Wellmann, H., Schobert, A. et al. Cultured chick sympathetic neurons: ATP-induced noradrenaline release and its blockade by nicotinic receptor antagonists. Naunyn-Schmiedeberg's Arch Pharmacol 352, 25–30 (1995). https://doi.org/10.1007/BF00169186
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DOI: https://doi.org/10.1007/BF00169186