| Autor: |
Mutsumi Okura, Nobuhiro Fujiki, Ichiro Kita, Kazuki Honda, Yasushi Yoshida, Emmanuel Mignot, Seiji Nishino |
| Jazyk: |
angličtina |
| Rok vydání: |
2004 |
| Předmět: |
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| Zdroj: |
Neurobiology of Disease, Vol 16, Iss 1, Pp 274-282 (2004) |
| Druh dokumentu: |
article |
| ISSN: |
1095-953X |
| DOI: |
10.1016/j.nbd.2004.02.008 |
| Popis: |
Cataplexy, an emotion-triggered sudden loss of muscle tone specific to narcolepsy, is tightly associated with hypocretin deficiency. Using hypocretin receptor 2 gene (hcrtr 2)-mutated narcoleptic Dobermans, we have previously demonstrated that altered dopamine (DA) D2/3 receptor mechanisms in mesencephalic DA nuclei are important for the induction of cataplexy. In the current study, we also found that the administration of D2/3 agonists into diencephalic dopaminergic cell groups, including the area dorsal to the ventral tegmental area (DRVTA) and the periventricular gray (PVG) matter of the caudal thalamus (corresponding to area A11), significantly aggravated cataplexy in hcrtr 2-mutated narcoleptic Dobermans. A D1 agonist and antagonist and a DA uptake inhibitor perfused into the DRVTA had no effect on cataplexy, suggesting an involvement of D2/3 receptors located on DA cell bodies (i.e., autoreceptors) for the regulation of cataplexy. Because the A11 cell group projects to the spinal ventral horn, the A11 D2/3 receptive mechanisms may directly modulate the activity of spinal motoneurons and modulate cataplexy. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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