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馬の胎盤におけるIGFシステム構成要素の妊娠期に関連する変化
Kirsten E Scoggin1, Fatma Adlan2, Carleigh E Fedorka3
1Department of Veterinary Science, University of Kentucky, Lexington, KY 40546, USA.
Biomolecules
|August 28, 2025
まとめ
インスリン類似成長因子 (IGF) システム,特にIGF1は,馬の胎盤発育と血管新生に不可欠であり,妊娠中の血管内皮成長因子 (VEGF) 発現と正の相関関係を示しています.
科学分野:
- 生殖生物学
- 内分泌学
- 馬の科学
背景:
- インスリン類似成長因子 (IGF) システムは,胎盤の発達と血管新生に影響を与え,哺乳類の妊娠に不可欠です.
- IGFシステムの役割と,妊娠中に馬の胎盤 (chorioallantois; CA) と子宮内膜 (EN) の血管内皮成長因子 (VEGF) との関係に関する情報は限られている.
研究 の 目的:
- 妊娠期間中,イクビンのCAおよびENにおけるIGFシステム成分 (リガンド,受容体,結合タンパク質) の発現パターンを調査する.
- IGFシステム発現,特にIGF1とIGF2とVEGF発現の相関を試験する.
- 馬の妊娠中のIGF1の局所化と血清濃度を決定する.
主な方法:
- IGFリガンド (IGF1,IGF2),レセプター (IGF1R,IGF2R,INSR),および結合タンパク質 (IGFBPs,IGF2BPs) のmRNA発現の定量分析を,様々な妊娠年齢 (45日~11ヶ月) および産後における馬のCAおよびENで実施した.
- 免疫ヒストケミストリーは,馬のCA内にIGF1を局所する.
- 妊娠期間中の血清IGF1濃度測定
主要な成果:
- 妊娠6ヶ月でピークに達し,VEGF発現と正の相関関係を示した (r=0. 62,p=0. 001).
- IGF2 mRNAは妊娠期間中,馬CAでIGF1よりも豊富だったが,その発現はVEGFと相関しなかった.
- IGFBP2とIGF2BP2は妊娠初期 (45日目) に高度に発現し,IGFBP3とIGFBP5は産後増加した. 血清IGF1は妊娠9ヶ月でピークに達した.
結論:
- 馬のIGFシステム,特にIGF1は胎盤の発達と血管新生に重要な役割を果たします.
- IGF1がVEGF媒介の血管新生を調節することを示唆している.
- IGF結合タンパク質の差異的な発現は,馬の妊娠中の段階特有の役割を示唆する.
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