Ibrutinib-Mediated Atrial Fibrillation Attributable to Inhibition of C-Terminal Src Kinase

Research output: Contribution to journalJournal articleResearchpeer-review

  • Ling Xiao
  • Joe-Elie Salem
  • Sebastian Clauss
  • Alan Hanley
  • Aneesh Bapat
  • Maarten Hulsmans
  • Yoshiko Iwamoto
  • Gregory Wojtkiewicz
  • Murat Cetinbas
  • Maximilian J. Schloss
  • Justin Tedeschi
  • Benedicte Lebrun-Vignes
  • Lundby, Alicia
  • Ruslan Sadreyev
  • Javid Moslehi
  • Matthias Nahrendorf
  • Patrick T. Ellinor
  • David J. Milan

BACKGROUND: Ibrutinib is a Bruton tyrosine kinase inhibitor with remarkable efficacy against B-cell cancers. Ibrutinib also increases the risk of atrial fibrillation (AF), which remains poorly understood.

METHODS: We performed electrophysiology studies on mice treated with ibrutinib to assess inducibility of AF. Chemoproteomic analysis of cardiac lysates identified candidate ibrutinib targets, which were further evaluated in genetic mouse models and additional pharmacological experiments. The pharmacovigilance database, VigiBase, was queried to determine whether drug inhibition of an identified candidate kinase was associated with increased reporting of AF.

RESULTS: We demonstrate that treatment of mice with ibrutinib for 4 weeks results in inducible AF, left atrial enlargement, myocardial fibrosis, and inflammation. This effect was reproduced in mice lacking Bruton tyrosine kinase, but not in mice treated with 4 weeks of acalabrutinib, a more specific Bruton tyrosine kinase inhibitor, demonstrating that AF is an off-target side effect. Chemoproteomic profiling identified a short list of candidate kinases that was narrowed by additional experimentation leaving CSK (C-terminal Src kinase) as the strongest candidate for ibrutinib-induced AF. Cardiac-specific Csk knockout in mice led to increased AF, left atrial enlargement, fibrosis, and inflammation, phenocopying ibrutinib treatment. Disproportionality analyses in VigiBase confirmed increased reporting of AF associated with kinase inhibitors blocking Csk versus non-Csk inhibitors, with a reporting odds ratio of 8.0 (95% CI, 7.3-8.7; P

CONCLUSIONS: These data identify Csk inhibition as the mechanism through which ibrutinib leads to AF.

REGISTRATION: URL: https://ww.clinicaltrials.gov; Unique identifier: NCT03530215.

Original languageEnglish
Issue number25
Pages (from-to)2443-2455
Number of pages13
Publication statusPublished - 2020

    Research areas

  • atrial fibrillation, BTK protein, human, CSK tyrosine-protein kinase, electrophysiology, ibrutinib, protein kinase inhibitors, TYROSINE-KINASE, FAMILY KINASES, INFLAMMATION, RISK, GENE, PHARMACOKINETICS, ACALABRUTINIB, MULTICENTER, ARRHYTHMIAS, ACTIVATION

ID: 255212490