在子模型中,共感性结构和电生理学重塑的缩性心肌梗塞的子模型
bioRxiv : the preprint server for biology
|June 19, 2024
概括
氏硫酸蛋白质糖 (CSPGs) 导致心肌梗塞 (MI) 后心脏中的交感神经密度降低. 尽管如此,心脏仍然对同情刺激有反应,增加心律失常的风险.
科学领域:
- 心血管科学 心血管科学
- 神经科学是一个神经科学.
- 再生医学是一种再生医学.
背景情况:
- 丁硫酸盐蛋白质糖 (CSPGs) 抑制了动物心肌梗塞 (MI) 后的同情性再内内化.
- 这导致区域性低内内化,增加β-上腺素受体敏感性和更高的心律失常易感性.
- 在MI后的大型哺乳动物中,CSPGs和 hypo-innervation 的作用需要进行研究.
研究的目的:
- 为了研究CSPGs和同情性低内尔化在子心脏中所起的作用.
- 评估对心脏中风中交感神经刺激 (SNS) 和β-上腺刺激的电生理反应.
- 为了将CSPG表达和交感神经密度与心脏电生理学和心律失常易感性相关联.
主要方法:
- 使用子模型进行流性心肌梗塞 (MI).
- 使用电压和Ca2+敏感染料的光学映射来评估电生理学.
- 通过免疫组织化学评估了交感神经密度和CSPG表达;测试了对SNS和异二醇的反应.
主要成果:
- CSPGs在心脏病发作区域表达高,与MI子心脏中交感神经密度降低有关.
- 交感神经刺激 (SNS) 增加了动作潜力的持续时间 (APD) 分散和心室高心率/心肌 (VT/VF) 在心脏病发作中的易感性.
- 尽管神经密度降低,但心脏中风患者对SNS和异二醇的反应保持或增强,因异二醇诱导的Ca2+短暂持续时间更大.
结论:
- 情感重塑后MI在物种之间有相似之处,CSPG与情感低内内化有关.
- 低内置性心脏病心脏表现出保留或增强的β-上腺素敏感性.
- 这种增强的敏感性可能是心脏中心脏病发作中观察到的APD分散性和心律失常易感性增加的基础.
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