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The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR...
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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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セマフォリン3Aによる骨格保護

Mikihito Hayashi1, Tomoki Nakashima, Masahiko Taniguchi

  • 1Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Yushima 1-5-45, Bunkyo-ku, Tokyo 113-8549, Japan.

Nature
|April 24, 2012
PubMed
まとめ

セマフォリン3A (Sema3A) は,オステオクラストの活動を抑制し,オステオクラストの形成を促進することにより,骨を保護します. ニューロピリン-1 (Nrp1) に結合することによって媒介されるこの二重作用は,骨疾患に対する潜在的な治療戦略を提供します.

科学分野:

  • 骨生物学と骨格のホメオスタシス
  • 細胞シグナル伝達と分子機構
  • 骨疾患のための治療開発

背景:

  • 骨質は,全身のホルモンと共に,骨質芽細胞と骨質芽細胞に影響を与える局所的な要因によって調節されます.
  • オステオプロテゲリンはオステオクラストの活動を抑制しますが,オステオブラストとオステオクラストの両方を調節する単一の局所要因は知られていません.
  • 骨質の局所的調節因子を特定することは,骨格障害の理解と治療に不可欠です.

研究 の 目的:

  • 骨質の局所的決定因子としてのセマフォリン3A (Sema3A) の役割を調査する.
  • Sema3Aがオステオクラストとオステオブラストの活動に影響を与える分子メカニズムを解明する.
  • 骨の再生と疾患におけるセマ3Aの治療の可能性を評価する.

主な方法:

  • 核因子-κBリガンド (RANKL) 誘発経路の受容体活性化剤を分析することによって,骨格細胞の分化にSema3Aの効果を調査した.
  • Wnt/β-cateninシグナル伝達を通じて,Sema3Aとニューロピリン-1 (Nrp1) の結合がオステオブラストとアディポサイトの分化に与える影響を調べました.
  • セマ3aノックアウトマウスと遺伝子組み換えNrp1マウスを利用して,体内の骨のフェノタイプを評価しました.
  • ネズミにSema3Aを静脈内投与して,骨の体積と再生能力を評価する.

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主要な成果:

  • Nrp1へのセマ3A結合は,免疫受容体チロシンベースの活性化モチーフ (ITAM) とRhoAシグナル伝達を阻害することによって,RANKL誘発の骨格細胞分化を抑制した.
  • Sema3A/Nrp1シグナリングは,正規のWnt/β-catenin経路を通じて,オステオブラストの分化を刺激し,脂肪細胞の分化を抑制した.
  • セマ3Aの欠乏またはNrp1のセマ3A結合部位の障害は,オステオペニック現象型につながった.
  • 静脈内投与のSema3Aは,マウスの骨の容量を増加させ,骨の再生を加速させた.

結論:

  • セマフォリン3A (Sema3A) は新しい局所的因子で,骨格的骨の再吸収を抑制し,同時に骨格的骨の形成を促進することによって,骨格保護効果を発揮する.
  • Sema3Aとその受容体 Nrp1の相互作用は,骨細胞の分化と機能に不可欠な重要な信号伝達経路 (ITAM,RhoA,Wnt/β-catenin) を調節する.
  • Sema3Aは,骨粗鬆症や骨折の治癒を含む骨や関節疾患の治療薬として有意義な可能性を示しています.