title: The effects of jaspamide on human cardiomyocyte function and cardiac ion channel activity.
abstract: Jaspamide (jasplakinolide; NSC-613009) is a cyclodepsipeptide that has antitumor activity. A narrow margin of safety was observed between doses required for efficacy in mouse tumor models and doses that caused severe acute toxicity in rats and dogs. We explored the hypothesis that the observed toxicity was due to cardiotoxicity. Jaspamide was tested in a patch clamp assay to determine its effect on selected cardiac ion channels. Jaspamide (10 μM) inhibited Kv1.5 activity by 98.5%. Jaspamide also inhibited other channels including Cav1.2, Cav3.2, and HCN2; however, the Kv11.1 (hERG) channel was minimally affected. Using spontaneously contracting human cardiomyocytes derived from induced pluripotent stem cells, effects on cardiomyocyte contraction and viability were also examined. Jaspamide (30 nM to 30 μM) decreased cardiomyocyte cell indices and beat amplitude, putative measurements of cell viability and cardiac contractility, respectively. Concentration-dependent increases in rhythmic beating rate were noted at ≤ 6 h of treatment, followed by dose-dependent decreases after 6 and 72 h exposure. The toxic effects of jaspamide were compared with that of the known cardiotoxicant mitoxantrone, and confirmed by multiparameter fluorescence imaging analysis. These results support the hypothesis that the toxicity observed in rats and dogs is due to toxic effects of jaspamide on cardiomyocytes.
authors.affiliation: Developmental Therapeutics Program, National Cancer Institute, Bethesda, MD 20892, United States. schweikk@mail.nih.gov
authors.forename: Karen
authors.initials: K
authors.lastname: Schweikart
authors.forename: Liang
authors.initials: L
authors.lastname: Guo
authors.forename: Zachary
authors.initials: Z
authors.lastname: Shuler
authors.forename: Rory
authors.initials: R
authors.lastname: Abrams
authors.forename: Eric T
authors.initials: ET
authors.lastname: Chiao
authors.forename: Kyle L
authors.initials: KL
authors.lastname: Kolaja
authors.forename: Myrtle
authors.initials: M
authors.lastname: Davis
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D047630:Depsipeptides / Q000494:pharmacology*; D006801:Humans; D057026:Induced Pluripotent Stem Cells / Q000166:cytology; D007473:Ion Channels / Q000187:drug effects / Q000502:physiology; D032383:Myocytes, Cardiac / Q000187:drug effects* / Q000502:physiology
chemical_list: D000970:Antineoplastic Agents; D047630:Depsipeptides; D007473:Ion Channels; C057531:jasplakinolide