Salt-inducible kinases (SIKs) regulate TGFβ-mediated transcriptional and apoptotic responses

Luke D. Hutchinson, Nicola J. Darling, Stephanos Nicolaou, laria Gori, Daniel R. Squair, Philip Cohen, Caroline S. Hill, Gopal P. Sapkota (Lead / Corresponding author)

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
97 Downloads (Pure)


The signalling pathways initiated by members of the transforming growth factor-β (TGFβ) family of cytokines control many metazoan cellular processes, including proliferation and differentiation, epithelial-mesenchymal transition (EMT) and apoptosis. TGFβ signalling is therefore strictly regulated to ensure appropriate context-dependent physiological responses. In an attempt to identify novel regulatory components of the TGFβ signalling pathway, we performed a pharmacological screen by using a cell line engineered to report the endogenous transcription of the TGFβ-responsive target gene PAI-1. The screen revealed that small molecule inhibitors of salt-inducible kinases (SIKs) attenuate TGFβ-mediated transcription of PAI-1 without affecting receptor-mediated SMAD phosphorylation, SMAD complex formation or nuclear translocation. We provide evidence that genetic inactivation of SIK isoforms also attenuates TGFβ-dependent transcriptional responses. Pharmacological inhibition of SIKs by using multiple small-molecule inhibitors potentiated apoptotic cell death induced by TGFβ stimulation. Our data therefore provide evidence for a novel function of SIKs in modulating TGFβ-mediated transcriptional and cellular responses.

Original languageEnglish
Article number49
Number of pages17
JournalCell Death and Disease
Publication statusPublished - 22 Jan 2020


  • Apoptosis
  • Cell signaling

ASJC Scopus subject areas

  • Immunology
  • Cellular and Molecular Neuroscience
  • Cell Biology
  • Cancer Research


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