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GIT1 protects against breast cancer growth through negative regulation of Notch

  • Songbai Zhang
  • , Ayako Miyakawa
  • , Malin Wickström
  • , Cecilia Dyberg
  • , Lauri Louhivuori
  • , Manuel Varas-godoy
  • , Kati Kemppainen
  • , Shigeaki Kanatani
  • , Dagmara Kaczynska
  • , Ivar Dehnisch Ellström
  • , Lotta Elfman
  • , Pauliina Kronqvist
  • , Heli Repo
  • , Katsuhiko Mikoshiba
  • , Cecilia Sahlgren
  • , John Inge Johnsen
  • , Per Uhlén*
  • *Korresponderande författare för detta arbete

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

14 Citeringar (Scopus)
58 Nedladdningar (Pure)

Sammanfattning

Hyperactive Notch signalling is frequently observed in breast cancer and correlates with poor prognosis. However, relatively few mutations in the core Notch signalling pathway have been identified in breast cancer, suggesting that as yet unknown mechanisms increase Notch activity. Here we show that increased expression levels of GIT1 correlate with high relapse-free survival in oestrogen receptor-negative (ER(-)) breast cancer patients and that GIT1 mediates negative regulation of Notch. GIT1 knockdown in ER(-) breast tumour cells increased signalling downstream of Notch and activity of aldehyde dehydrogenase, a predictor of poor clinical outcome. GIT1 interacts with the Notch intracellular domain (ICD) and influences signalling by inhibiting the cytoplasm-to-nucleus transport of the Notch ICD. In xenograft experiments, overexpression of GIT1 in ER(-) cells prevented or reduced Notch-driven tumour formation. These results identify GIT1 as a modulator of Notch signalling and a guardian against breast cancer growth.
OriginalspråkEngelska
Artikelnummer1537
TidskriftNature Communications
Volym13
Nummer1
DOI
StatusPublicerad - 22 mars 2022
MoE-publikationstypA1 Tidskriftsartikel-refererad

Finansiering

This study was supported by the Swedish Research Council (grants 2013-3189, 2017-00815, and 2021-03108 to P.U.), the Swedish Cancer Society (grants CAN 2016-801, 19 0544 Pj, and 19 0545 Us to P.U. and CAN 2015-0793 to J.I.J.), the Swedish Childhood Cancer Foundation (grant PR2018-0123 and PR2020-0124 to P.U.), the Swedish Brain Foundation (grants FO2020-0199 and FO2021-0230 to P.U.), the Swedish Strategic Foundation (MultiBIO 2010 to P.U. and NNBCR 2015 to J.I.J.), the Knut and Alice Wallenberg Foundation (grants CLICK and Research Fellow to P.U.), the Sigrid Jusélius Foundation (to L.L. and C.S.), the K. Albin Johansson Foundation (to K.K.), and the Cancer Research Foundations of Radiumhemmet (to P.U. and J.I.J.). C.S. acknowledges the financial support from the Jane and Aatos Erkko Foundation, the Liv of Hälsa Foundation, the Academy of Finland (309373), and the Cancer Society of Finland.

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