2019 Fiscal Year Final Research Report
The inhibitory effects sympathetic nervous system via alpha2-adrenergic receptor
| Project/Area Number |
16K09455
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Cardiovascular medicine
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| Research Institution | Showa University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2020-03-31
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| Keywords | 交感神経 / 抑制作用 |
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| Outline of Final Research Achievements |
It was reported that NE depolarized the SPNs and NE significantly increased the frequency and voltage of EPSP and IPSP. Dxm after application of NE decreased the EPSP frequency and EPSP voltage and IPSP voltage of the SPN. However, in some SPNs, NE induced membrane hyperpolarization and completely inhibited firings. Dxm had no effect in these SPNs. Next, we tried similar experiments using medulla - spinal cord - sympathetic nerve trunk preparation to see clearly inhibitory effects via α2-adrenergic receptor. However, we could not have clear effects. Other agents (Phenylephrine、Atipamezole、Corticotrophin releasing factor) also did not show any clear effects. Based on the above, we are studying the mechanisms of regulation of glutamic acid release via α2 receptor by adrenergic C1 neuron.
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| Free Research Field |
循環器内科
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| Academic Significance and Societal Importance of the Research Achievements |
交感神経システムにおけるα2受容体を介した抑制作用についてはよくわかっていない。我々は、興奮下でオートレセプターによる抑制作用が機能しない場合、交感神経活動過亢進からカテコラミン過剰状態になり、心血管疾患の増悪に関与している可能性がある との仮説を立てた。本研究は交感神経の抑制作用を薬理学的、電気性生理学的に考察し、交感神経過亢進が引き起こす疾患においてもそのメカニズムの考察に重要と考えられる。
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