iScience (Jul 2021)

Identification of response signatures for tankyrase inhibitor treatment in tumor cell lines

  • Line Mygland,
  • Shoshy Alam Brinch,
  • Martin Frank Strand,
  • Petter Angell Olsen,
  • Aleksandra Aizenshtadt,
  • Kaja Lund,
  • Nina Therese Solberg,
  • Max Lycke,
  • Tor Espen Thorvaldsen,
  • Sandra Espada,
  • Dorna Misaghian,
  • Christian M. Page,
  • Oleg Agafonov,
  • Ståle Nygård,
  • Nai-Wen Chi,
  • Eva Lin,
  • Jenille Tan,
  • Yihong Yu,
  • Mike Costa,
  • Stefan Krauss,
  • Jo Waaler

Journal volume & issue
Vol. 24, no. 7
p. 102807

Abstract

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Summary: Small-molecule tankyrase 1 and tankyrase 2 (TNKS1/2) inhibitors are effective antitumor agents in selected tumor cell lines and mouse models. Here, we characterized the response signatures and the in-depth mechanisms for the antiproliferative effect of tankyrase inhibition (TNKSi). The TNKS1/2-specific inhibitor G007-LK was used to screen 537 human tumor cell lines and a panel of particularly TNKSi-sensitive tumor cell lines was identified. Transcriptome, proteome, and bioinformatic analyses revealed the overall TNKSi-induced response signatures in the selected panel. TNKSi-mediated inhibition of wingless-type mammary tumor virus integration site/β-catenin, yes-associated protein 1 (YAP), and phosphatidylinositol-4,5-bisphosphate 3-kinase/AKT signaling was validated and correlated with lost expression of the key oncogene MYC and impaired cell growth. Moreover, we show that TNKSi induces accumulation of TNKS1/2-containing β-catenin degradasomes functioning as core complexes interacting with YAP and angiomotin proteins during attenuation of YAP signaling. These findings provide a contextual and mechanistic framework for using TNKSi in anticancer treatment that warrants further comprehensive preclinical and clinical evaluations.

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