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慢性的な低酸素は,鶏の胚における近動脈交感神経の発達を刺激する
K Ruijtenbeek1, F A le Noble, G M Janssen
1Department of Pediatrics, Research Institute of Growth and Development (GROW), Universiteit Maastricht, Maastricht, The Netherlands.
Circulation
|January 11, 2000
まとめ
鶏の胚における慢性産前低酸素症は,動脈交感性内置を増加させ,成人期に潜在的に心血管疾患のリスクを高めます. この研究では,胎児の酸素レベルと動脈の神経発達との関連を調査した.
科学分野:
- 発達生物学 発達生物学とは
- 心血管の生理学 心血管の生理学
- 神経内分泌学の神経内分泌学
背景:
- 低出生体重は,成人における冠動脈疾患と関連しています.
- 胎児の発達は,産前栄養素と酸素の不均衡によって永久に変化することがあります.
- 産前低酸素症は胎児の神経内分泌の発達と動脈交感内置に影響を与える可能性があります.
研究 の 目的:
- 慢性的な産前低酸素が,鶏の胚における動脈交感内置を増加させるかどうかを判断する.
- 胎児の発達と成人期への心血管系の準備に対する低酸素の影響を調査する.
主な方法:
- 鶏の胚は,化中にノルモキシ (21%O2) またはヒポキシ (15%O2) の条件に曝された.
- 胚性股関節動脈の交感内置は,生化学的,組織学的,機能的測定を用いて評価されました.
- ノルエピネフリン含有量と神経繊維密度が定量化され,インビトロ収縮反応が測定されました.
主要な成果:
- 低酸素症は胚死亡率を増加させ,胎児の体重を減少させた.
- 股関節動脈のノレピネフリン含有量と交感神経繊維密度は,低酸素胚において上昇した.
- 低酸素胚の動脈はノレピネフリンに対する感受性の低下を示し,ノレピネフリン再吸収を阻害することで正常化しました.
結論:
- 慢性的な中度産前低酸素症は,鶏の胚における動脈系の交感性ハイパーニナーベーションを誘発する.
- このメカニズムは,同様の発達上の制約で生まれた人の心血管疾患のリスク増加に寄与する可能性があります.
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