Targeting tankyrase scaffolding in the β-catenin destruction complex by PROTAC overcomes the limitation of catalytic inhibitors in colorectal cancer
Aberrant WNT/β-catenin signaling drives tumorigenesis and metastasis in cancer. Although enzymatic inhibitors of tankyrase (TNKS) effectively block AXIN degradation and stabilize the β-catenin destruction complex (DC), they have demonstrated limited efficacy in various cancer models. Here we demonstrate that, unexpectedly, the induction of AXIN puncta represents a major barrier to achieving therapeutic efficacy. Mechanistically, catalytic inhibition of TNKS prevents TNKS turnover and drives its accumulation in the DC, wherein the scaffolding function of TNKS induces AXIN puncta formation, rigidifies the DC, and impedes β-catenin turnover. Chemically induced degradation of TNKS overcomes this limitation by stabilizing AXIN without puncta formation, providing a deeper suppression of the WNT/β-catenin pathway activity and the proliferation of colorectal cancer cells harboring dysfunctional APC mutations. Collectively, these findings provide an explanation for the unsatisfactory outcomes of drugging the WNT/β-catenin signaling pathway by TNKS inhibitors and highlight TNKS degradation as a promising approach to treat WNT/β-catenin-driven cancers.
Authors
- Lin You (ORCID: https://orcid.org/0000-0003-1162-0064)
- Yong De Lu (ORCID: https://orcid.org/0000-0002-3656-3185)
- Liping Yao (ORCID: https://orcid.org/0000-0001-6213-5339)
- Nageswari Yarravarapu (ORCID: https://orcid.org/0000-0002-1975-0077)
- Andrew S. Lemoff (ORCID: https://orcid.org/0000-0002-4943-0170)
- Lawrence Lum (ORCID: https://orcid.org/0000-0002-6119-0253)
- Yonghao Yu (ORCID: https://orcid.org/0000-0001-8414-4666)
- Ann Marie Flusché (ORCID: https://orcid.org/0009-0008-9037-4239)
- Ilgen Mender (ORCID: https://orcid.org/0000-0003-4542-327X)
- Lei Han (ORCID: https://orcid.org/0000-0001-8209-5813)
- Chuo Chen (ORCID: https://orcid.org/0000-0002-3118-4901)
- Jerry W. Shay (ORCID: https://orcid.org/0000-0001-5052-0627)
- Qian Wang (ORCID: https://orcid.org/0000-0002-0326-4410)
- Liping Li (ORCID: https://orcid.org/0000-0001-7396-1310)
- Chiho Kim (ORCID: https://orcid.org/0000-0001-6846-5515)
- Shuai Wang (ORCID: https://orcid.org/0000-0002-9142-6095)
Institutions
- The University of Texas Southwestern Medical Center (US)
Publication Details
- Journal
- eLife
- Published
- 2026-11-04
- DOI
- https://doi.org/10.7554/elife.109052.4
- Citations
- 1
- Primary Topic
- Wnt/β-catenin signaling in development and cancer
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- York University
- National Institutes of Health
- Medical Research Council
- National Cancer Institute
- National Institute of General Medical Sciences