STAT5b is a key effector of NRG-1/ERBB4-mediated myocardial growth

Katri Vaparanta, Anne Jokilammi, Ilkka Paatero, Johannes A Merilahti, Juho Heliste, Karthik Amudhala Hemanthakumar, Riikka Kivelä, Kari Alitalo, Pekka Taimen, Klaus Elenius

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
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The growth factor Neuregulin-1 (NRG-1) regulates myocardial growth and is currently under clinical investigation as a treatment for heart failure. Here, we demonstrate in several in vitro and in vivo models that STAT5b mediates NRG-1/EBBB4-stimulated cardiomyocyte growth. Genetic and chemical disruption of the NRG-1/ERBB4 pathway reduces STAT5b activation and transcription of STAT5b target genes Igf1, Myc, and Cdkn1a in murine cardiomyocytes. Loss of Stat5b also ablates NRG-1-induced cardiomyocyte hypertrophy. Dynamin-2 is shown to control the cell surface localization of ERBB4 and chemical inhibition of Dynamin-2 downregulates STAT5b activation and cardiomyocyte hypertrophy. In zebrafish embryos, Stat5 is activated during NRG-1-induced hyperplastic myocardial growth, and chemical inhibition of the Nrg-1/Erbb4 pathway or Dynamin-2 leads to loss of myocardial growth and Stat5 activation. Moreover, CRISPR/Cas9-mediated knockdown of stat5b results in reduced myocardial growth and cardiac function. Finally, the NRG-1/ERBB4/STAT5b signaling pathway is differentially regulated at mRNA and protein levels in the myocardium of patients with pathological cardiac hypertrophy as compared to control human subjects, consistent with a role of the NRG-1/ERBB4/STAT5b pathway in myocardial growth.

Original languageEnglish
Article numbere56689
Number of pages24
JournalEMBO Reports
Issue number5
Publication statusPublished - 4 May 2023
MoE publication typeA1 Journal article-refereed


  • Mice
  • Humans
  • Animals
  • Dynamin II/metabolism
  • Neuregulin-1/genetics
  • STAT5 Transcription Factor/genetics
  • Zebrafish/metabolism
  • Receptor, ErbB-4/genetics
  • Hypertrophy


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