通过上述方法获得的细胞集群,适用于评价化合物作用于离子通道,从而影响QT间隔的研究。这是目前最早报道的,利用MED64检测电位改变,筛选获得合适细胞集群,从而建立一个能够评价QT间隔所受影响程度的方法。
Yamazaki K等人的研究,为利用诱导产生的细胞进行药物筛选提供了一种更加完善的体系。快速、准确获得药物对目的细胞的作用效果,将成为现实。
平面微电极阵列记录系统(MED64)是当前进行离体电生理研究的最佳助手,MED64已经成功应用于:
• 中枢神经系统:如大脑皮层、海马体、视网膜、视交叉上核、杏仁核;
• 周围神经系统:如背根神经节
• 心肌 (心房、心室、心肌细胞)和其它易兴奋组织(如平滑肌)
• 急性脑切片, 切片外植体和分离培养物.
文献来源:http://www.ncbi.nlm.nih.gov/pubmed/22198052
A novel method of selecting human embryonic stem cell-derived cardiomyocyte clusters for assessment of potential to influence QT interval.
Yamazaki K, Hihara T, Taniguchi T, Kohmura N, Yoshinaga T, Ito M, Sawada K.
SourceEisai Product Creation Systems, Eisai Co., Ltd.,
Abstract
Physiologically relevant assessment of delayed repolarization is necessary in drug development. In our preliminary experiments on the evaluation using a multielectrode recording system, we had found that the responsiveness of field potential duration (FPD), as QT-like intervals, to hERG channel blockers differed greatly from non-responders to excessive responders in human embryonic stem cell-derived cardiomyocyte clusters. Thus, we report a novel method of selecting clusters suitable for evaluating compounds for the assessment. Clusters were treated with cisapride, a hERG channel blocker, at 100nM, and selected with criteria of 5-20% of corrected FPD (FPDc) prolongation. Then, selected clusters were treated with reference compounds. FPDc was prolonged by blockade of the hERG channel (E-4031 and dl-sotalol) and KvLQT1 channel (chromanol 293B and HMR1556), and by activation of the sodium channel (veratridine) and calcium channel (Bay K8644). FPDc was shortened by calcium channel blockage (verapamil, nifedipine and diltiazem) and by K(ATP) channel activation (pinacidil).