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• W1986077515 abstract "N-methyl-D-aspartate (NMDA) receptors exist on noradrenergic axon terminals and mediate enhancement of noradrenaline (NA) release. We here investigated modulation by somatostatin (SRIF, somatotropin release inhibiting factor) of the NMDA-induced release of NA using superfused hippocampal synaptosomes. The NMDA response was increased by SRIF-28 and SRIF-14, but not SRIF-28((1 - 14)), whereas the release of [(3)H]-NA elicited by alpha-amino-3-hydroxy-5-methylisoxazide-4-propionic acid (AMPA) was unaffected. SRIF-14 did not mimic glycine at the NMDA receptor but activated SRIF receptors sited on noradrenergic terminals. The SRIF-14 effect was blocked by pertussis toxin but mimicked by mastoparan, a G-protein activator. BIM-23056, but not Cyanamid 154806, antagonized the SRIF-14 effect. This effect was mimicked by L362855, a partial agonist at the sst(5) subtype, but not by the new selective sst(1) - sst(4) receptor agonists L797591, L779976, L796778 and L803087. Protein kinase C (PKC) inhibitors (H7, staurosporine, GF 209103X, cheleritrine and sphingosine) prevented the SRIF-14 effect, while phorbol 12-myristate 13-acetate enhanced the NMDA response. SRIF-14 permitted NMDA receptor activation in the presence of 1.2 mM Mg(2+) ions, both in hippocampal synaptosomes and slices. Blockade of inositol-1,4,5-trisphosphate (InsP(3)) receptors with heparin abolished the effect of SRIF-14. It is concluded that SRIF receptors, possibly of the sst(5) subtype, can exert a permissive role on NMDA receptors colocalized on hippocampal noradrenergic terminals: activation of sst(5) receptors is coupled to pertussis toxin-sensitive G proteins enhancing phosphoinositide metabolism with activation of InsP(3) receptors and PKC; NMDA receptor subunits might be phosphorylated with consequent removal of the Mg(2+) block in absence of depolarization." @default.
• W1986077515 created "2016-06-24" @default.
• W1986077515 creator A5015779278 @default.
• W1986077515 creator A5081582944 @default.
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• W1986077515 date "2000-06-01" @default.
• W1986077515 modified "2023-09-24" @default.
• W1986077515 title "Somatostatin potentiates NMDA receptor function<i>via</i>activation of InsP₃receptors and PKC leading to removal of the Mg²⁺block without depolarization" @default.
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• W1986077515 doi "https://doi.org/10.1038/sj.bjp.0703346" @default.
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