Cited by 154Protein Degradation and InhibitorsLymphoma Diagnosis and TreatmentChemical Synthesis and Analysis

Development of a Novel B-Cell Lymphoma 6 (BCL6) PROTAC To Provide Insight into Small Molecule Targeting of BCL6

Open access
McCoull, William, Cheung, Tony, Anderson, Erica, Barton, Peter, Burgess, Jonathan, Byth, Kate, Cao, Qing, Castaldi, M. Paola +29 more·2018·ACS Chemical Biology

Abstract

B-cell lymphoma 6 (BCL6) inhibition is a promising mechanism for treating hematological cancers but high quality chemical probes are necessary to evaluate its therapeutic potential. Here we report potent BCL6 inhibitors that demonstrate cellular target engagement and exhibit exquisite selectivity for BCL6 based on mass spectrometry analyses following chemical proteomic pull down. Importantly, a proteolysis-targeting chimera (PROTAC) was also developed and shown to significantly degrade BCL6 in a number of diffuse large B-cell lymphoma (DLBCL) cell lines, but neither BCL6 inhibition nor degradation selectively induced marked phenotypic response. To investigate, we monitored PROTAC directed BCL6 degradation in DLBCL OCI-Ly1 cells by immunofluorescence and discovered a residual BCL6 population. Analysis of subcellular fractions also showed incomplete BCL6 degradation in all fractions despite having measurable PROTAC concentrations, together providing a rationale for the weak antiproliferative response seen with both BCL6 inhibitor and degrader. In summary, we have developed potent and selective BCL6 inhibitors and a BCL6 PROTAC that effectively degraded BCL6, but both modalities failed to induce a significant phenotypic response in DLBCL despite achieving cellular concentrations.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1021/acschembio.8b00698

Cites

40 of 40 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

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?

  • BI-3802 surpassed the efficacy of non-degrading BCL6 inhibitors such as BI-3812 or PROTAC-based BCL6 degraders, which had only shown modest pre-clinical success.

    “surpassing the efficacy of non-degrading Bcl6 inhibitors such as Bi-3812 or PROtAc-based Bcl6 degraders, which had only shown modest pre-clinical success (Mccoull et al. 2018;Schlager et al. 2020).”

    From From serendipity to strategy: molecular glue degraders in cancer therapeutics (2025) · cites this paper as Mccoull et al. 2018

    In “Developing PROTAC Ready BCL6 Ligands” (page unavailable), McCoull et al. report weak antiproliferative effects for their BCL6 inhibitors and similarly weak effects for PROTAC 15 in lymphoma cell lines. Our copy does not establish that BI-3802 surpassed these compounds or identify BI-3812 as one of the inhibitors tested, so it supports only the limited-response portion of the claim. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Anti-proliferative effects of BI-3802 in lymphoma models closely mirrored genetic BCL6 deletion.

    “the anti-proliferative effects observed in lymphoma models closely mirrored genetic BCL6 deletion”

    From From serendipity to strategy: molecular glue degraders in cancer therapeutics (2025) · cites this paper as Mccoull et al. 2018

    The Abstract discusses BCL6 shRNA-induced lethality, while the section on antiproliferative activity reports weak, nonselective effects for the paper’s PROTAC 15. Our copy does not report BI-3802 or compare its antiproliferative effects with genetic BCL6 deletion (searched: BI-3802, genetic deletion, knockout). (LLM, conf=0.76)

    Experimental — accuracy not yet measured
  • BCL6 is recalcitrant to hetero-bifunctional degraders, which have shown insufficient target modulation to induce growth inhibition.

    “One such example is the B cell lymphoma 6 (BCL6) protein, for which hetero-bifunctional degraders have shown insufficient target modulation to induce growth inhibition5.”
  • A significant subset of proteins are recalcitrant to targeted protein degradation using current approaches.

    “but a significant subset of proteins are recalcitrant to targeted protein degradation using current approaches4,5.”
  • BI-3802 induces rapid ubiquitination and degradation of BCL6.

    “BI-3802 induces rapid ubiquitination and degradation of BCL6, resulting in profound de-repression of BCL6 target genes and anti-proliferative effects in DLBCL cell lines, comparable to a genetic knock-out21, and superior to non-degrading BCL6 inhibitors such as BI-3812 or heterobifunctional BCL6 degraders5,6.”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
McCoull, W., Cheung, T., Anderson, E., Barton, P., Burgess, J., Byth, K., Cao, Q., Castaldi, M. P., Chen, H., Chiarparin, E., Carbajo, R. J., Code, E., Cowan, S., Davey, P. R., Ferguson, A. D., Fillery, S., Fuller, N. O., Gao, N., Hargreaves, D., Howard, M. R., Hu, J., Kawatkar, A., Kemmitt, P. D., Leo, E., Molina, D. M., O’Connell, N., Petteruti, P., Rasmusson, T., Raubo, P., Rawlins, P. B., Ricchiuto, P., Robb, G. R., Schenone, M., Waring, M. J., Zinda, M., Fawell, S., & Wilson, D. M.
Affiliations
  • AstraZeneca (United Kingdom) (GB)
  • AstraZeneca (United States) (US)
  • Pelago Bioscience (Sweden) (SE)
  • Broad Institute (US)
Corresponding author
McCoull, William
Venue
ACS Chemical Biology
Published
2018-10-17
Volume
13
Issue
11
Pages
3131-3141
ISSN
  • 1554-8929 (ISSN-L)
  • 1554-8937
OpenAlex
W2896054460
Cited by
139
References
40
Citations by year
2026: 11 · 2025: 15 · 2024: 9 · 2023: 12 · 2022: 27 · 2021: 23 · 2020: 24 · 2019: 18
FWCI
6.22
Type
journal article
Language
en
Open access
Locations
  • ACS Chemical Biology (publishedVersion)
  • PubMed (publishedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • Newcastle University ePrints (Newcastle Univesity)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Lymphoma Diagnosis and Treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chemical Synthesis and Analysis
Keywords
BCL6, PROTACs, BCL6 inhibitors, diffuse large B-cell lymphoma, small molecule targeting, chemical probes, cellular target engagement, chemoproteomics, subcellular localization, antiproliferative response
MeSH terms
Antineoplastic Agents, Humans, Ligands, Peptide Hydrolases, Protein Binding, Thalidomide, Quinolones, Lymphoma, Large B-Cell, Diffuse, Ubiquitin-Protein Ligases, Cell Line, Tumor, Adaptor Proteins, Signal Transducing, Proto-Oncogene Proteins c-bcl-6, HEK293 Cells, Proteolysis

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