Abstract
PRESYNAPTIC α-adrenoceptors on noradrenergic nerve endings have been shown to mediate a negative feedback mechanism which leads to inhibition of transmitter release during depolarisation induced by nerve stimulation or potassium1–3. On the other hand, it is known that in some tissues activation of presynaptic β-adrenoceptors both in vitro and in vivo leads to an increase in transmitter release4–8. The α-adrenoceptors seem to operate by restricting the calcium available for the excitation–secretion coupling, and the facilitating effect of β-agonists on transmitter release seems to be mediated through an increase in the levels of cyclic AMP in noradrenergic nerve endings7,8. Recent reports9,10 have provided electrophysiological evidence for a prejunctional role of cyclic nucleotides in neurotransmission. In the rat pineal gland a calcium-dependent presynaptic mechanism for the generation of cyclic GMP has been reported which might be linked to an α-adrenergic-like receptor11. In addition, there is evidence in this gland for an α-adrenergic presynaptic mechanism regulating noradrenaline release elicited by potassium12. Consequently, we decided to examine and report here our finding of a role of cyclic nucleotides in noradrenaline release from the rat pineal gland and the possible involvement of these substances in the regulatory mechanisms mediated through the α and β presynaptic adrenoreceptors.
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PELAYO, F., DUBOCOVICH, M. & LANGER, S. Possible role of cyclic nucleotides in regulation of noradrenaline release from rat pineal through presynaptic adrenoceptors. Nature 274, 76–78 (1978). https://doi.org/10.1038/274076a0
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DOI: https://doi.org/10.1038/274076a0
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