4.7 Article

Disease characterization using LQTS-specific induced pluripotent stem cells

期刊

CARDIOVASCULAR RESEARCH
卷 95, 期 4, 页码 419-429

出版社

OXFORD UNIV PRESS
DOI: 10.1093/cvr/cvs206

关键词

Long QT syndrome; Drug examination; iPS cells; Cardiomyocytes; Personalized medicine

资金

  1. Ministry of Education, Science and Culture, Japan
  2. Programme for Promotion of Fundamental Studies in Health Science of the National Institute of Biomedical Innovation and Health Labour Sciences Research Grant
  3. Grants-in-Aid for Scientific Research [22136007, 22590813, 24390199, 23590297, 24591086, 22590779, 22689027, 23136503, 11J30002, 23790873] Funding Source: KAKEN

向作者/读者索取更多资源

Long QT syndrome (LQTS) is an inheritable and life-threatening disease; however, it is often difficult to determine disease characteristics in sporadic cases with novel mutations, and more precise analysis is necessary for the successful development of evidence-based clinical therapies. This study thus sought to better characterize ion channel cardiac disorders using induced pluripotent stem cells (iPSCs). We reprogrammed somatic cells from a patient with sporadic LQTS and from controls, and differentiated them into cardiomyocytes through embryoid body (EB) formation. Electrophysiological analysis of the LQTS-iPSC-derived EBs using a multi-electrode array (MEA) system revealed a markedly prolonged field potential duration (FPD). The IKr blocker E4031 significantly prolonged FPD in control- and LQTS-iPSC-derived EBs and induced frequent severe arrhythmia only in LQTS-iPSC-derived EBs. The IKs blocker chromanol 293B did not prolong FPD in the LQTS-iPSC-derived EBs, but significantly prolonged FPD in the control EBs, suggesting the involvement of IKs disturbance in the patient. Patch-clamp analysis and immunostaining confirmed a dominant-negative role for 1893delC in IKs channels due to a trafficking deficiency in iPSC-derived cardiomyocytes and human embryonic kidney (HEK) cells. This study demonstrated that iPSCs could be useful to characterize LQTS disease as well as drug responses in the LQTS patient with a novel mutation. Such analyses may in turn lead to future progress in personalized medicine.

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