書誌事項
- タイトル別名
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- Hydroxyl Radical Production in the Peripheral Nervous System in Experimental Autoimmune Neuritis
- JIKKENTEKI JIKO MENEKISEI SHINKEIEN RATTO NI OKERU MASSHO SHINKEI NAI HIDOROKISHIRAJIKARU NO SANSEI
- ジッケンテキ ジコ メンエキセイ シンケイエン ラット ニ オケル マッショウ シンケイ ナイ ヒドロキシラジカル ノ サンセイ
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原著
目的: 実験的自己免疫性神経炎(experimental autoimmune neuritis:EAN)におけるヒドロキシラジカル(・OH)の変化とスカベンジャーによる消去効果を検討した.対象と方法: 5~7週齢のメスLewis ratをウシP2蛋白(aa53-78)由来の合成ペプチドで免疫しEANを誘発した.EAN群とコントロール群(complete Freund's adjuvant:CFA群)において,1運動障害の観察,2馬尾神経の組織学的検索,3組織内・OH産生を反映する2.3-dihydroxybenzoic acid(DHBA)の高速クロマトグラフィー電気化学検出器を用いたサリチル酸捕捉法による測定を行った.その後,フリーラジカルスカベンジャーのedaravone 10 mg/kg/日を連日投与した影響を検討した.結果: EAN群は尾の弛緩性麻痺から発症し,免疫後15日目にほぼ完全な弛緩性対麻痺に至りその後回復したがCFA群は全実験期間を通じて運動症状は呈しなかった.EAN群の末梢神経内DHBAは免疫後11, 14日目にCFA群に比して有意に増加した(p<0.05).Edaravone投与により末梢神経内DHBAは非投与群に比べ11日目に有意に減少し(p<0.05),運動麻痺は免疫後18, 19日目で有意に軽症であった(p<0.05).脂質酸化障害のマーカーであるmalondialdehydeは浸潤したmacrophageの分布にほぼ一致して局在した.結論: EANの運動症状発症時期に増加する・OHの消去は症状の早期からの回復をもたらし,EANにおける末梢神経炎症による組織機能障害に・OHが関与することが示唆された.Background: Few studies have investigated hydroxyl radical (・OH) formation in experimental autoimmune neuritis (EAN), an animal model of human Guillain-Barré syndrome. We examined ・OH formation and the role of ・OH during EAN progression. Methods: A synthetic peptide of the P2 protein in bovine peripheral nerve myelin was injected into the hind limb of female Lewis rats. Motor impairment was assessed daily. ・OH in the cauda equina (CE) was measured by the salicylate-trapping method, using high-performance liquid chromatography and an electrochemical detector (ESA model 5500). To eliminate ・OH, EAN rats were treated daily with the free radical scavenger intraperitoneal edaravone (10 mg/kg/day). In addition, CE tissue was used for immunohistologic examination of malondialdehyde, an important marker of lipid oxidation products. Results: EAN rats developed flaccid paralysis of the tail tip at 11 days post-immunization (DPI), which gradually progressed to flaccid paraplegia. Motor dysfunction peaked at 14-16 DPI and was followed by spontaneous recovery. Production of 2.3-dihydroxybenzoic acid (DHBA), which is produced from ・OH and salicylate, was higher in the EAN group than in control at 11 and 14 DPI. Recovery from EAN was faster in the group treated with edaravone than in the untreated EAN group, although symptom onset and severity did not significantly differ between these groups. 2.3-DHBA production in the CE was significantly lower at 11 DPI in edaravone-treated rats than in the untreated EAN group. Immunohistologic study revealed malondialdehyde in mononuclear cell infiltration foci, mainly comprising macrophages, in the CE of EAN rats. Conclusions: Hydroxyl radical was produced in CE during acute EAN. Scavenging of hydroxyl radical resulted in early resolution of EAN, which suggests a close relationship between functional impairment and hydroxyl radical in this model.
収録刊行物
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- 東邦医学会雑誌
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東邦医学会雑誌 62 (1), 2-10, 2015-03
東邦大学医学会
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詳細情報 詳細情報について
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- CRID
- 1390572174765979776
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- NII論文ID
- 120006412200
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- NII書誌ID
- AA1273926X
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- ISSN
- 21891990
- 00408670
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- NDL書誌ID
- 026346960
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- 本文言語コード
- ja
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- 資料種別
- journal article
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- データソース種別
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- JaLC
- IRDB
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