最も伝染性の高いプリオンタンパク質粒子は,
Jay R Silveira1, Gregory J Raymond, Andrew G Hughson
1Laboratory of Persistent Viral Diseases, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana 59840, USA.
Nature
|September 9, 2005
まとめ
大きな繊維ではなく,より小さなタンパク質集積が,伝染性スポンジ状脳症 (TSE) の主要な原動力です. PrP (res) を含んだ非線維粒子は,最も高い感染性と病気を引き起こす可能性を示しています.
科学分野:
- 神経生物学 神経生物学とは
- タンパク質の誤折り症の病気
- プリオン生物学のプリオン生物学
背景:
- アルツハイマー病やパーキンソン病などの神経変性疾患は,異常なタンパク質の蓄積を伴う.
- 伝染性スポンジ状脳症 (TSE) は,プロテアゼ耐性プリオンタンパク質 (PrP(res)) アグリゲートによって特徴付けられています.
- TSEにおける正確な病原性種 (繊維細胞 vs. オリゴーマー) は依然として議論されている.
研究 の 目的:
- PrP (リゾート) アグレガットのサイズと,その感染性と変換活動との関係を調査する.
- より小さなオリゴーマーまたはより大きな繊維がTSE病原性の主要な原因であるかどうかを決定する.
- TSEの伝播に責任を負うPrP (res) アグレガートの特定のサイズ範囲を特徴付けるために.
主な方法:
- PrP (レズ) アグレガットの部分分解.
- クロマトグラフィを用いたPrP(res) アグレгатиのサイズ分化.
- 光散射と非変性ゲル電泳を用いた集積量,感染力,およびタンパク質変換活動の分析.
主要な成果:
- 感染性と変換活動は,17〜27 nm (300〜600 kDa) の非線維性PrP粒子でピークに達しました.
- 大きな繊維は,これらの小さな粒子と比較して,実質的に低い活性を示しました.
- 5個以下のPrP分子からなるオリゴーマーには,実質的に感染性や変換活性がない.
結論:
- 14〜28個のタンパク質分子に相当する非線維性PrP (res) 粒子は,TSE疾患の最も強力なイニシアターです.
- これらの発見は,大きなアミロイド繊維がTSEの病原性における唯一のまたは主要な罪人であるという考えに異議を唱える.
- この研究では,プリオン病を理解し,潜在的に治療するための重要なターゲットとして,特定の集積サイズを特定しています.
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