在胎儿绵羊中,系统性炎症反应对重复和不断增加的内毒素挑战产生系统性炎症反应
Sanya Kathuria1, Akash Gupta2, Ayna R Tracy1
1School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, Arizona, USA.
Physiological reports
|April 23, 2025
概括
这项研究开发了一个胎儿炎症反应综合征 (FIRS) 模型,使用羊的脂多糖 (LPS). 该模型有效地引起了强大的生理和炎症反应,这对于研究长期胎儿暴露干预措施至关重要.
科学领域:
- 产周医学 产周医学
- 免疫学 免疫学 免疫学
- 胎儿生理学 胎儿生理学
背景情况:
- 重复的低剂量脂聚糖化物 (LPS) 暴露可以减弱胎儿的反应,这使得对长期暴露的干预措施的研究复杂化.
- 开发一个可靠的胎儿炎症反应综合征 (FIRS) 模型对于理解和减轻胎儿不良结果至关重要.
研究的目的:
- 在绵羊中建立一个胎儿炎症反应综合征 (FIRS) 模型,该模型始终表明对升级剂量的脂多糖 (LPS) 产生显著的生理反应.
- 为了表征系统生理和分子炎症标志物,以应对受控的,多剂量LPS挑战在羊胎儿.
主要方法:
- 在五天内静脉注射四次增加剂量的脂聚糖 (LPS) (0.3,1.5,3,和15μg) 给胎儿绵羊.
- 监测生理参数,包括血气,pH,乳酸和皮质醇水平.
- 对外围血液单核细胞 (PBMC) 进行转录基因变化的分析,并在胎儿组织中测量细胞因子表达.
主要成果:
- 所有LPS挑战都导致乳酸,皮质醇和pCO2的增加,并在3-5小时内降低pH和pO2.
- 在LPS给药后,PBMC数量增加,转录组分析显示了高调的炎症基因特征,补体激活和NFκB信号通路.
- 在胎儿肺,心脏,肝脏,胎盘和脏中检测到高水平的促炎细胞因子 (TNFα,IL-6,IL-1β),这表明有系统性炎症反应.
结论:
- 开发的绵羊模型为研究胎儿对LPS的炎症反应提供了一个强大的平台,其特点是显著的生理和分子变化.
- 尽管有潜在的太基菲拉克西,但该模型显示,在增加LPS剂量时,系统性炎症反应一致,这使得进一步调查胎儿炎症状况成为可能.
- 这种模型对于评估旨在减轻长期胎儿炎症攻击影响的潜在干预措施是有价值的.
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