腫瘍死滅因子受容体1は,イシュケミア中の女性の心筋内部の抵抗をシグナルする
Meijing Wang1, Ben M Tsai, Paul R Crisostomo
1Department of Surgery, Indiana University School of Medicine, Indianapolis, Indiana, USA.
Circulation
|July 6, 2006
まとめ
メスマウスは,心不全と再注射 (I/R) の後に発信する腫瘍死滅因子-α受容体1 (TNFR1) への抵抗を示し,よりよい回復に貢献しています. TNFR1シグナル伝達におけるこの性差は,女性の改善結果を説明する可能性がある.
科学分野:
- 心血管生物学 心血管生物学
- 免疫学 免疫学とは
- 心筋筋病理生理学 心筋筋病理生理学
背景:
- 腫瘍死滅因子-アルファ (TNF) は,心筋筋不全後および再注血 (I / R) を増加させ,機能障害に寄与します.
- 55kDaのTNF受容体 (TNFR1) は,TNFの有害な効果を媒介するかもしれないが,TNFは有益な作用もする.
- 心不全の発生率と生存における性差は,TNFシグナル伝達に対する明確な反応を示唆する.
研究 の 目的:
- I/R.中の心筋TNFR1シグナル伝達における性別差異を調査する.
- 女性の心筋膜が,イシュケミア中にTNFR1シグナル伝達抵抗性を示すという仮説を検証する.
主な方法:
- I/R.を施した野生型 (WT) とTNFR1-ノックアウト型マウスのオスとメスの比較
- 心筋機能の評価,TNF誘発性うつ,および炎症マーカーの発現.
- I/R後のシトカインシグナル伝達タンパク質3 (SOCS3) 発現抑制剤の分析.
主要な成果:
- 雌のWTマウスは,TNFR1シグナリングレジスタンスに起因する雄よりも,よりよい後発血回復を示した.
- 雌のWTマウスは,TNF輸注後,心筋不調が少ないことを示した.
- TNFR1アブレーションは男性では改善したが,女性では改善されず,女性ではI/R後のSOCS3レベルが高くなった.
結論:
- I/R.に続く心筋TNFR1シグナル伝達において,有意な性差が存在する.
- SOCS3によって媒介される可能性がある女性におけるTNFR1シグナリング抵抗は,I/R後のより良い心的結果に貢献する.
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