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ONEILL, M,CALDWELL, M,EARLEY, B,CANNEY, M,OHALLORAN, A,KELLY, J,LEONARD, BE,JUNIEN, JL
1995
September
European Journal Of Pharmacology
THE SIGMA-RECEPTOR LIGAND JO-1784 (IGMESINE-HYDROCHLORIDE) IS NEUROPROTECTIVE IN THE GERBIL MODEL OF GLOBAL CEREBRAL-ISCHEMIA
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CEREBRAL ISCHEMIA JO 1784 (IGMESINE HYDROCHLORIDE) HIPPOCAMPUS NEUROPROTECTION NITRIC OXIDE (NO) SYNTHASE (GERBIL) TRANSIENT FOREBRAIN ISCHEMIA D-ASPARTATE ANTAGONIST NITRIC-OXIDE SYNTHESIS AMINO-ACID RECEPTORS LOCOMOTOR-ACTIVITY NEURONAL DEATH BRAIN-DAMAGE SELECTIVE LIGAND BINDING-SITES GYKI 52466
283
217
225
To assess the effects of the novel a receptor ligand JO 1784 ((+)-N-cyclopropyl-methyl-N-methyl-1,4-diphenyl-1-yl-but-3-en-1-ylamine, hydrochloride or igmesine hydrochloride) on behavioural and histological changes following cerebral ischaemia, the gerbil model of cerebral ischaemia was used. Two experiments were carried out. In the first animals were either sham operated, subjected to 5 min of bilateral carotid occlusion or administered JO 1784 (25, 50, 75 or 100 mg/kg p.o.) 1, 24 and 48 h after 5 min bilateral carotid occlusion and histological evaluation carried our 96 h after surgery. In the second experiment the effects of JO 1784 administered at a dose of 100 mg/kg i.p. 30 min, 6, 24 and 48 h post-surgery on home cage activity and nitric oxide (NO) synthase activity in the cortex, hippocampus, cerebellum and brain stem 4 days after surgery was examined. Extensive neuronal death was observed in the CA1 region of 5 min occluded animals. JO 1784 (50, 75 and 100 mg/kg) provided significant protection against this ischaemia-induced cell death (P < 0.03-0.005). In the second experiment a large increase in home cage activity was observed for 5 min occluded animals for 12 h after surgery (P = 0.0018-0.02). A large increase in NO synthase activity was observed in all brain regions for 5 min occluded animals. Post-administration of JO 1784 attenuated the ischaemia-induced hyperactivity and increased NO synthase activities. These results show that the selective a receptor ligand JO 1784 is neuroprotective in the gerbil model of cerebral ischaemia and indicates that a receptor ligands may be useful in preventing ischaemia-induced neurodegeneration.
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