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- W1996642775 abstract "The release of immunoreactive (ir-) dynorphin (DYN) and α-neoendorphin (α-NEO) from spinal cord slices was investigated in rats. A stable, spontaneous, in vitro release of these peptides (6.7 ± 0.3 of ir-DYN and 15.5 ± 0.3 fmol/min/g wet tissue of ir-α-NEO) was measured in superfusates using highly sensitive radioimmunoassays. The exposure of the slices to the superfusion medium containing 57 mM K+ or 50 μM veratridine increased circa three times the basal release of the peptides. The K+-evoked release of ir-α-NEO was Ca2+-dependent, and the veratridine stimulation was abolished by 1 μM tetrodotoxin. Modulation of the α-neoendorphin release from the lumbar enlargement of the rat spinal cord by various neuroactive compounds was studied in vitro. Noradrenaline (1 μM) slightly enhanced the K+-induced release of ir-α-NEO, but was without effect on the basal release. On the other hand, GABA (10 μM) and muscimol (1 μM) inhibited the K+-stimulated release of the peptide. The effect of muscimol was attenuated by bicuculline (10 μM). Other compounds, such as serotonin (1 μM), naloxone (1 μM), U-50, 488H and bicuculline, altered neither the basal nor the K+-induced release. These data indicate that both ir-DYN and ir-α-NEO are stored in a releasable pool in the spinal cord, which supports the concept that prodynorphin peptides can serve as neurotransmitters in this structure. Furthermore, this study suggests that the spinal cord prodynorphin system may be under an inhibitory gabaergic and an excitatory catecholaminergic control." @default.
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- W1996642775 date "1990-08-01" @default.
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- W1996642775 title "Modulation of prodynorphin peptides release from the rat spinal cord in vitro" @default.
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- W1996642775 doi "https://doi.org/10.1016/0143-4179(90)90063-5" @default.
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