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Zooming in on the WNT/CTNNB1 Destruction Complex: Functional Mechanistic Details with Implications for Therapeutic Targeting

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Pharmacology of the WNT Signaling System

Abstract

WNT/CTNNB1 signaling is crucial for balancing cell proliferation and differentiation in all multicellular animals. CTNNB1 accumulation is the hallmark of WNT/CTNNB1 pathway activation and the key downstream event in both a physiological and an oncogenic context. In the absence of WNT stimulation, the cytoplasmic and nuclear levels of CTNNB1 are kept low because of its sequestration and phosphorylation by the so-called destruction complex, which targets CTNNB1 for proteasomal degradation. In the presence of WNT proteins, or as a result of oncogenic mutations, this process is impaired and CTNNB1 levels become elevated.

Here we discuss recent advances in our understanding of destruction complex activity and inactivation, focusing on the individual components and interactions that ultimately control CTNNB1 turnover (in the “WNT off” situation) and stabilization (in the “WNT on” situation). We especially highlight the insights gleaned from recent quantitative, image-based studies, which paint an unprecedentedly detailed picture of the dynamic events that control destruction protein complex composition and function. We argue that these mechanistic details may reveal new opportunities for therapeutic intervention and could result in the destruction complex re-emerging as a target for therapy in cancer.

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Acknowledgements

We thank Tomas Noordzij for literature research that helped shape the section on therapeutic targeting. We thank Tanne van der Wal for critically reading the manuscript. RvA acknowledges funding by the Netherlands Science Foundation NWO (VIDI 864.13.002 and OC.ENW.169) and KWF kankerbestrijding (2017-1/11082). SdM acknowledges funding by the Fulbright Foundation and Nijbakker-Morra Foundation.

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Correspondence to Renée van Amerongen .

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de Man, S.M.A., van Amerongen, R. (2021). Zooming in on the WNT/CTNNB1 Destruction Complex: Functional Mechanistic Details with Implications for Therapeutic Targeting. In: Schulte, G., Kozielewicz, P. (eds) Pharmacology of the WNT Signaling System. Handbook of Experimental Pharmacology, vol 269. Springer, Cham. https://doi.org/10.1007/164_2021_522

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