摘要
目的:本研究调查了褪黑激素(MEL)和丰富的环境(EE)是否可以预防大鼠子宫内发育迟缓(IUGR)。 方法:将Sprague-Dawley大鼠随机分为3组:对照组(C),模型(M)和EE + MEL组。将动物饲养在丰富的环境中(EE + MEL组)或留在标准环境中(C组,M组)。 IUGR大鼠模型是通过在孕期喂养低蛋白饮食而建立的。 MEL是通过管饲法施用的。出生后第1天,测定胎鼠的基线特征和血清生化参数,肝和小肠的形态,酶活性和mRNA表达水平。通过蛋白质印迹分析确定自噬标记物LC3和Beclin1。 结果:EE + MEL明显改善了IUGR胎儿的基线特征,肝和肠形态。此外,EE + MEL显着增加了胎儿肠道中的乳糖酶活性。血清生长抑素(SST),生长激素(GH),生长激素释放激素(GHRH),胰岛素样生长因子1(IGF-1),三碘甲状腺素(T3)和四碘甲状腺素(T4)的水平可通过以下方法恢复EE + MEL。此外,EE + MEL还显着改善了SST,GHRH和GHRH受体(GHRHR),GH,GHR,IGF-1和IGF-1受体(IGF1R),IGF结合蛋白1(IGFBP1)的mRNA表达,哺乳动物雷帕霉素(mTOR),S6激酶1(S6K1)和真核起始因子4E(eIF4E)结合蛋白1(4EBP1)的哺乳动物靶标。在IUGR胎儿肝脏中,出生时LC3和Beclin1升高,而EE + MEL组中LC3和Beclin1明显降低。 结论:EE + MEL可以改善胎鼠的基线特征,血清生化指标,出生体重,肠道和肝脏的形态以及酶活性。这些效应可以通过激活IGF-1 / IGFBP1和IGF-1 / mTOR / S6K1 / 4EBP1信号通路以及自噬抑制来解释。
关键词: 褪黑激素,丰富的环境,宫内生长受限,胰岛素样生长因子-1,mTOR,自噬。
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