PTX3は,外的な腫瘍抑制剤であり,がんにおける補完体依存性炎症を調節する
Eduardo Bonavita1, Stefania Gentile1, Marcello Rubino1
1Humanitas Clinical and Research Center, Rozzano (Milan) 20089, Italy.
Cell
|February 14, 2015
まとめ
重要な先天性免疫タンパク質であるペントラキシン3 (PTX3) は,炎症と補完体の活性化を調節することにより,腫瘍抑制剤として作用します. その欠乏は,腫瘍の成長とマクロファージの募集を促進することによって,癌の感受性を高めます.
科学分野:
- 免疫学 免疫学とは
- 腫瘍学 腫瘍学
- 分子生物学は分子生物学である.
背景:
- ペントラキシン3 (PTX3) は,先天性免疫と炎症の調節に不可欠です.
- PTX3は,補完因子C1qとH因子と相互作用し,補完カスケードを調節する.
- PTX3欠乏症は,発癌に対する感受性の増加と関連しています.
研究 の 目的:
- PTX3ががんの発生と制御における役割を調査する.
- PTX3欠乏が腫瘍の成長を促すメカニズムを解明する.
- 人間の腫瘍におけるPTX3の表遺伝子調節を調査する.
主な方法:
- 遺伝子標的型Ptx3(-/-) マウスを利用して,がん発生を研究した.
- マクロファージの浸透,サイトカインの産生,およびPtx3(-/-) マウスの血管新生を分析した.
- 人間の腫瘍におけるPTX3の表遺伝子調節 (プロモーターメチル化) を研究した.
主要な成果:
- Ptx3(-/-) のマウスは,発がん性への感受性が高まり,炎症とTrp53変異が増加した.
- PTX3欠乏は,補完体の活性化,CCL2の産生,および腫瘍促進マクロファージの徴募を拡大した.
- プロモーターメチレーションによるPTX3の表遺伝的静止は,レオミオサルコマや結腸直腸がんなどのヒト腫瘍で観察されました.
結論:
- PTX3は,マウスとヒトの両方で,外的な腫瘍抑制遺伝子として機能します.
- PTX3は,腫瘍発達の促進を促す,補足に依存した,マクロファージ媒介の炎症を調節する.
- PTX3またはその調節経路をターゲットにすることで,がんに対する治療戦略を提供することができます.
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