進化的に保存された膜タンパク質であるPACは,陽子活性化塩化チャネルである
Junhua Yang1, Jianan Chen1, Maria Del Carmen Vitery1
1Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
まとめ
研究者らは,PAC (TMEM206) を,陽子活性化塩素電流 (ICl,H) に対して決定的であると特定した. この発見は 細胞の酸性への反応や 脳卒中などの疾患における 細胞の役割を明らかにしています
科学分野:
- 分子生物学
- 細胞生理学
- 神経科学
背景:
- 重度の局所性酸性症は組織損傷と痛みの主要な要因で,イシュケミア,癌,炎症などの疾患で一般的です.
- 酸性環境に対する細胞の反応を制御する正確な分子機構は まだ完全に理解されていません
研究 の 目的:
- 細胞の酸性反応に関与する分子因子を特定する.
- 生理学的および病理学的条件における陽子活性化塩化物電流 (ICl,H) の機能を明らかにする.
主な方法:
- 陽子活性化塩化物流に欠かせない遺伝子を特定するために 偏らないRNA干渉スクリーンを実施した.
- 細胞系と動物モデル (ゼブラフィッシュ,マウス) での遺伝子ノックアウトと過剰表現技術を活用した.
- 陽子活性化塩化物電流 (ICl,H) を測定し,脳卒中のマウスモデルで脳損傷を評価した.
主要な成果:
- 陽子活性化塩化物電流 (ICl,H) に必要不可欠なPAC (TMEM206) を特定した.
- ICl,Hをノックアウト細胞で回復させることが示された.
- ネズミのPacのノックアウトは神経細胞のICl,Hを排除し,脳卒中後の脳損傷を減らすことが示されました.
- ゼブラフィッシュPACは 独特のチャネル特性を表しています
結論:
- PAC (TMEM206) は,陽子活性化塩素チャネルの重要な構成要素である.
- PACチャネルファミリーは,酸性pHに対する細胞反応において重要な役割を果たします.
- PACをターゲットにすることで,血中性脳卒中などのアシドーシスを伴う疾患の治療戦略を提供することができます.
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