2017年9月30日
L-DOPA inhibits excitatory synaptic transmission in the rat nucleus tractus solitarius through release of dopamine
Neuroscience
- ,
- ,
- 巻
- 360
- 号
- 開始ページ
- 18
- 終了ページ
- 27
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.neuroscience.2017.07.043
© 2017 IBRO The mode of action of L-DOPA on excitatory synaptic transmission in second-order neurons of the nucleus tractus solitarius (NTS) was studied using the rat brainstem slices. Superfusion of L-DOPA (10 μM) reduced the frequency of miniature excitatory postsynaptic currents (mEPSCs) without any effect on the amplitude. A low concentration (1 μM) was ineffective on the mEPSCs, and the highest concentration (100 μM) exerted a stronger inhibitory effect. L-DOPA (10 μM) decreased the amplitude of EPSCs (eEPSCs) evoked by electrical stimulation of the tractus solitarius and increased the paired-pulse ratio. The inhibitory effects of L-DOPA on mEPSCs and eEPSCs were similar to those of dopamine (100 μM). The effects of L-DOPA were blocked by a competitive antagonist, L-DOPA methyl ester (100 μM) and also by a D2 receptor antagonist, sulpiride (10 μM), while those of dopamine were blocked by the latter but not by the former. In reserpine (5 mg/kg, s.c.)-treated rats, the effects of L-DOPA on both mEPSCs and eEPSCs were completely abolished, but those of dopamine remained unchanged. The present results suggest a possibility that L-DOPA may induce the release of dopamine from the axon terminals in the NTS and the released dopamine suppresses the glutamatergic transmission through activation of the presynaptic D2 receptors.
- リンク情報
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- DOI
- https://doi.org/10.1016/j.neuroscience.2017.07.043
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/28757247
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85028501498&origin=inward
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85028501498&origin=inward
- ID情報
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- DOI : 10.1016/j.neuroscience.2017.07.043
- ISSN : 0306-4522
- eISSN : 1873-7544
- PubMed ID : 28757247
- SCOPUS ID : 85028501498