Cited by 394Chronic Lymphocytic Leukemia ResearchProtein Degradation and InhibitorsLymphoma Diagnosis and Treatment

Targeting the C481S ibrutinib-resistance mutation in Bruton’s tyrosine kinase using PROTAC-mediated degradation

Buhimschi, Alexandru D., Armstrong, Haley A., Toure, Momar, Jaime-Figueroa, Saul, Chen, Timothy L., Lehman, Amy M., Woyach, Jennifer A., Johnson, Amy J. +2 more·2018·Biochemistry

Abstract

Inhibition of Bruton's tyrosine kinase (BTK) with the irreversible inhibitor ibrutinib has emerged as a transformative treatment option for patients with chronic lymphocytic leukemia (CLL) and other B-cell malignancies, yet >80% of CLL patients develop resistance due to a cysteine to serine mutation at the site covalently bound by ibrutinib (C481S). Currently, an effective treatment option for C481S patients exhibiting relapse to ibrutinib does not exist, and these patients have poor outcomes. To address this, we have developed a PROteolysis TArgeting Chimera (PROTAC) that induces degradation of both wild-type and C481S mutant BTK. We selected a lead PROTAC, MT-802, from several candidates on the basis of its potency to induce BTK knockdown. MT-802 recruits BTK to the cereblon E3 ubiquitin ligase complex to trigger BTK ubiquitination and degradation via the proteasome. MT-802 binds fewer off-target kinases than ibrutinib does and retains an equivalent potency (>99% degradation at nanomolar concentrations) against wild-type and C481S BTK. In cells isolated from CLL patients with the C481S mutation, MT-802 is able to reduce the pool of active, phosphorylated BTK whereas ibrutinib cannot. Collectively, these data provide a basis for further preclinical study of BTK PROTACs as a novel strategy for treatment of C481S mutant CLL.

Integrity signals

Registry

Crossref · 10.1021/acs.biochem.8b00391

Cites

63 of 63 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Several studies reported successful conversion of either a reversible ibrutinib scaffold or a different noncovalent analog derived from a previously published covalent BTK inhibitor into BTK degraders.

    “Subsequently, several studies reported successful conversion of either a reversible ibrutinib scaffold 42,43 or a different noncovalent analog derived from a previously published covalent BTK inhibitor 44,45 into BTK degraders.”
  • The C481S resistance mutation in BTK renders first-generation BTK inhibitors less effective.

    “particularly because of emergence of the C481S resistance mutation in BTK that renders first-generation BTK inhibitors less effective169,170.”

    From PROTAC targeted protein degraders: the past is prologue (2022) · cites this paper as [169]

  • MT-802, but not ibrutinib, reduces activated-BTK levels in patient-derived CLL cells harboring the C481S mutation.

    “MT-802, but not ibrutinib, was found to reduce activated-BTK levels in patient-derived CLL cells harboring the C481S mutation [116].”
  • MT-802 is equally effective in degrading both wild-type and C418S mutated BTK.

    “MT-802, a lead BTK PROTAC developed by Crews’ group, was shown to be equally effective in degrading both wild-type and C418S mutated BTK.”
  • Several PROTACs targeting BTK to CRBN have been generated and exhibit the potential to treat ibrutinib-resistant non-Hodgkin's lymphomas.

    “several PROTACs targeting BTK, a protein that is important for normal B cell development and development of B cell lymphoma, to CRBN have been generated and exhibit the potential to treat ibrutinib-resistant non-Hodgkin’s lymphomas [6, 92].”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Buhimschi, A. D., Armstrong, H. A., Toure, M., Jaime-Figueroa, S., Chen, T. L., Lehman, A. M., Woyach, J. A., Johnson, A. J., Byrd, J. C., & Crews, C. M.
Affiliations
  • Yale University (US)
  • The Ohio State University (US)
  • Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06511, United States
Corresponding author
  • Byrd, John C.
  • Crews, Craig M.
Venue
Biochemistry
Published
2018-05-31
Volume
57
Issue
26
Pages
3564-3575
ISSN
  • 0006-2960 (ISSN-L)
  • 1520-4995
OpenAlex
W2805296794
Cited by
394
References
63
Citations by year
2026: 33 · 2025: 55 · 2024: 56 · 2023: 44 · 2022: 59 · 2021: 55 · 2020: 47 · 2019: 35 · 2018: 8 · 2014: 1
FWCI
20.84
Type
journal article
Language
en
Open access
closed
Locations
  • Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Cancer Institute (R35CA197589)
  • Arvinas, Inc.
Topics
  • Health Sciences › Medicine › Genetics › Chronic Lymphocytic Leukemia Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Lymphoma Diagnosis and Treatment
Keywords
Bruton's tyrosine kinase, ibrutinib resistance, PROTACs, chronic lymphocytic leukemia, proteasomal degradation, BTK phosphorylation, B-cell malignancies
MeSH terms
Agammaglobulinaemia Tyrosine Kinase, Adenine, Humans, Piperidines, Pyrazoles, Pyrimidines, Drug Design, Leukemia, Lymphocytic, Chronic, B-Cell, Point Mutation, Drug Resistance, Neoplasm, Amino Acid Substitution, Cell Line, Tumor, Protein Kinase Inhibitors, Ubiquitination, Proteolysis, Molecular Docking Simulation

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review