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Murine Fetal Echocardiography
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過剰な甲状腺ホルモン被曝に関連した胎児の喪失
João Anselmo1, Dingcai Cao, Theodore Karrison
1Endocrinology Unit, Hospital Divino Espírito Santo, Ponta Delgada, Azores-Portugal.
JAMA
|August 12, 2004
まとめ
甲状腺ホルモン (RTH) 耐性を持つ母親は,より高い流産率を経験しました. 影響を受けていない乳児は出生時体重が低く,TSHが抑制され,母性甲状腺ホルモン (TH) の過剰から胎児のチロトキシコシスが生じることを示した.
科学分野:
- 内分泌学 エンドックリノロジー
- 生殖医学は,生殖器医学である.
- 遺伝学 遺伝学とは
背景:
- 母親の甲状腺疾患は,妊娠の結果に大きな影響を与えます.
- 胎児ホルモンの直接的な評価は限られているため,胎児のチロトキシコシスを研究することは困難です.
- 甲状腺ホルモン (RTH) への抵抗は,胎児に対するTH過剰の影響を研究するためのモデルを提供します.
研究 の 目的:
- 過剰な甲状腺ホルモン (TH) 曝露が,RTHを患っている母親の胎児に与える影響を調査する.
- RTHを患っている母親の妊娠結果を評価するために,RTHを患っていない母親の妊娠結果を評価するために,RTHを患っている母親の妊娠結果を評価するために.
- 高い母体TH濃度が胎児のチロトキシコシスにつながるかどうかを判断する.
主な方法:
- アゾレスのRTHの家族から167人の個人を遡及的に分析した.
- 遺伝子型決定により,Arg243-->Gln変異が,TH受容体β遺伝子に感染した個体で確認されました.
- 影響を受けた母親,影響を受けた父親,影響を受けていない親族の間で妊娠の結果,出生体重,および新生児のTSHレベルの比較.
主要な成果:
- 影響を受けた母親は,対照群 (2.0%-4.4%) に比べて,妊娠中絶率 (22.9%) が著しく高かった.
- 罹患した母親から生まれた影響を受けていない乳児は出生時体重が低い (平均SDスコア-1.79) で,検知できないTSHレベルでした.
- 影響を受けた母親は,より多くの影響を受けた子 (20 件の影響を受けた対 11 件の影響を受けなかった) に向かって傾向がありました.
結論:
- RTHを持つ母親の高流産率は,影響を受けていない胎児に不釣り合いな影響を及ぼす可能性があります.
- RTHの母性TH濃度の過剰は胎児のチロトキシコシスを引き起こし,低出生体重と無影響の乳児のTSH抑制によって証明されます.
- これらの発見は,胎児の発達に対する甲状腺ホルモンの過剰の直接的な毒性効果を示唆しています.
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