首页> 外文期刊>American Journal of Physiology >Force-length relations in isolated intact cardiomyocytes subjected to dynamic changes in mechanical load.
【24h】

Force-length relations in isolated intact cardiomyocytes subjected to dynamic changes in mechanical load.

机译:机械负荷动态变化下分离的完整心肌细胞的力长关系。

获取原文
获取原文并翻译 | 示例
           

摘要

We developed a dynamic force-length (FL) control system for single intact cardiomyocytes that uses a pair of compliant, computer-controlled, and piezo translator (PZT)-positioned carbon fibers (CF). CF are attached to opposite cell ends to afford dynamic and bidirectional control of the cell's mechanical environment. PZT and CF tip positions, as well as sarcomere length (SL), are simultaneously monitored in real time, and passive/active forces are calculated from CF bending. Cell force and length were dynamically adjusted by corresponding changes in PZT position, to achieve isometric, isotonic, or work-loop style contractions. Functionality of the technique was assessed by studying FL behavior of guinea pig intact cardiomyocytes. End-diastolic and end-systolic FL relations, obtained with varying preload and/or afterloads, were near linear, independent of the mode of contraction, and overlapping for the range of end-diastolic SLs tested (1.85-2.05 micro m). Instantaneous elastance curves, obtained from FL relation curves, showed an afterload-dependent decrease in time to peak elastance and slowed relaxation with both increased preload and afterload. The ability of the present system to independently and dynamically control preload, afterload, and transition between end-diastolic and end-systolic FL coordinates provides a valuable extension to the range of tools available for the study of single cardiomyocyte mechanics, to foster its interrelation with whole heart pathophysiology.
机译:我们开发了一种用于单个完整心肌细胞的动态力长(FL)控制系统,该系统使用一对顺应,计算机控制和压电转换器(PZT)定位的碳纤维(CF)。 CF连接到电池的相对两端,以动态且双向地控制电池的机械环境。同时实时监控PZT和CF尖端位置以及肌节长度(SL),并通过CF弯曲计算被动/主动力。细胞力和长度通过PZT位置的相应变化而动态调整,以实现等距,等渗或工作环式收缩。通过研究豚鼠完整心肌细胞的FL行为来评估该技术的功能。舒张末期和收缩末期FL关系是通过变化的预紧力和/或后负荷获得的,它们接近线性,与收缩方式无关,并且在所测试的舒张末期SL范围(1.85-2.05微米)内重叠。从FL关系曲线获得的瞬时弹性曲线显示,随着载荷的增加和载荷的增加,达到峰值弹性所需的时间随载荷的减少而松弛的速度减慢。本系统独立且动态地控制舒张末期和收缩末期FL坐标之间的预负荷,后负荷以及过渡的能力,为可用于研究单个心肌细胞力学的工具范围提供了有价值的扩展,以促进其与全心病理生理。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号