1988 Fiscal Year Final Research Report Summary
Interactions between Classical Neurotransmitter Systems and Neuropeptide Systems in Experimental Animal Model of Parkinsonism
| Project/Area Number |
61570387
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Neurology
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| Research Institution | Okayama University |
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Principal Investigator |
OGAWA Norio Okayama University Medical School / Associate Professor, 医学部, 助教授 (90033208)
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| Project Period (FY) |
1986 – 1988
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| Keywords | Parkinsonism / Advanced stage / MPTP / 6-OHDA / Weaver mouse / D-2 dopamine receptor / Muscarinic cholinergic receptor / ソマトスタチン受容体 |
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| Research Abstract |
Interactions between classical neurotransmitter systems and neuropeptide systems were studied in experimantal animal model of parkinsonism. It was revealed that 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-treated mice, Weaver mice and 6-OHDA double (substantia nigra and lateral ventricle)-treated rats were suitable model for parkinsonism. In the rats with double administrations of 6-OHDA, the noradrenaline concentration strongly decreased in the almost all brain regions, indicating that this animal model is best model for advernced stage of parkinsonism. In the animal model, the concentration of D-2 dopamine receptor increased significantly but recovered to the normao level after administration of L-dopa. On the other hand, the concentration of the striatal muscarinic cholinergic receptor (MCR) decreased significantly but recovered to the normal level after administration of L-dopa. These findings indicated that the striatal MCR are strongly requlated by the nigrostriatal dopaminergic function. Substance P, cholecystokinin-octapeptide and somatostatin levels showed no change in any brain region of animal models. Interestingly, striatal somatostatin level showed a marked decrease in chronic phase of MPTP mice. Somatostatin receptor binding increased in the model animal, but did not recovered by administration of L-dopa. These data suggest that core biochemical dysfunctions in parkinsonism are changes in dopaminergic and cholinergic systems, and changes in neuropeptide systems are seconderily changes due to dopaminergic dysfunctions.
Experimental animal model of parkinsonism is expected to be valuable in the studies on the biochemical pathophysiology of Parkinson's disease, the development of new drugs and studies on the therapeutic regiments to minimize the side effects.
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Research Products
(14 results)
