エキゾチオスの経路は,偏光化した上皮細胞MDCKKのアピカルとベースラテラルの両方の細胞表面に存在します
Cell
|November 1, 1985
まとめ
Madin-Darby Canine Kidney (MDCK) 細胞は,アピカルとベースラテラルの両面に異種ライソジームタンパク質を分泌する. しかし,内生タンパク質は厳密にアピカルに分泌され,上皮細胞の明確な偏分分泌経路を明らかにします.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- エピテル細胞生物学 エピテル細胞生物学
背景:
- Madin-Darby Canine Kidney (MDCK) 細胞のような偏極化された上皮細胞は,独特の頂上および底側膜領域を示します.
- 分極化された細胞のタンパク質分泌経路を理解することは,様々な生理学的プロセスと疾患メカニズムにとって極めて重要です.
研究 の 目的:
- MDCK細胞における外来タンパク質 (鶏卵巣リゾ酵素) と内生タンパク質の分泌極性を調べる.
- MDCK細胞が,異なるタンパク質を,その頂上および底辺の表面に運ぶための明確な輸送経路を示しているかどうかを判断する.
主な方法:
- MDCK細胞クローンの生成は,遺伝的変異を介して鶏肉リゾジームを安定的に分泌します.
- ニトロセルロースフィルターに変換されたMDCK細胞単層を培養して,分泌を分析する.
- リン酸酵素と内生タンパク質の分泌を頂上部と下部部に定量化する.
- 人工物の輸送や漏れを排除するための制御実験.
主要な成果:
- 変換されたMDCK細胞は,酵素的に活性な鶏肉リゾジームをアピカルおよびベースラテラルメディアの両方に分泌しました.
- これは,異種タンパク質が両方の細胞表面に直接輸送する経路を示します.
- 対照的に,内生性タンパク質 (30-40 kDa) は,アピカル媒質にのみ分泌された.
- 固有のタンパク質は,より大きな前駆体から細胞内処理されるようです.
結論:
- MDCK細胞は,異なる分泌経路を有し,外来タンパク質と内生タンパク質の異なる標的化が可能である.
- 外来タンパク質は,頂点と底辺の両方の表面に導かれる可能性があり,内生タンパク質は厳格な頂点の極性を示します.
- この研究は,偏光化した上皮細胞における複雑なタンパク質の分類と分泌のメカニズムを解明しています.
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