Cited by 698Protein Degradation and InhibitorsCell death mechanisms and regulationUbiquitin and proteasome pathways

A selective BCL-XL PROTAC degrader achieves safe and potent antitumor activity

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Khan, Sajid, Zhang, Xuan, Lv, Dongwen, Zhang, Qi, He, Yonghan, Zhang, Peiyi, Liu, Xingui, Thummuri, Dinesh +17 more·2019·Nature Medicine

Abstract

B-cell lymphoma extra large (BCL-X L) is a well-validated cancer target. However, the on-target and dose-limiting thrombocytopenia limits the use of BCL-X L inhibitors, such as ABT263, as safe and effective anticancer agents. To reduce the toxicity of ABT263, we converted it into DT2216, a BCL-X L proteolysis-targeting chimera (PROTAC), that targets BCL-X L to the Von Hippel-Lindau (VHL) E3 ligase for degradation. We found that DT2216 was more potent against various BCL-X L-dependent leukemia and cancer cells but considerably less toxic to platelets than ABT263 in vitro because VHL is poorly expressed in platelets. In vivo, DT2216 effectively inhibits the growth of several xenograft tumors as a single agent or in combination with other chemotherapeutic agents, without causing appreciable thrombocytopenia. These findings demonstrate the potential to use PROTAC technology to reduce on-target drug toxicities and rescue the therapeutic potential of previously undruggable targets. Furthermore, DT2216 may be developed as a safe first-in-class anticancer agent targeting BCL-X L.

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  • A navitoclax PROTAC rapidly and specifically degraded BCL-2, causing apoptosis of cancer cells with less off-target lysis.

    “The use of a navitoclax PROTAC facilitated the rapid and specific degradation of BCL-2, resulting in apoptosis of cancer cells with less off-target lysis.”

    From Senolytic Drugs: Reducing Senescent Cell Viability to Extend Health Span (2021) · cites this paper as [76]

    The Discussion states that DT2216, the PROTAC derived from navitoclax, is specific for BCL-XL and does not induce BCL-2 degradation. The Abstract supports reduced platelet toxicity and antitumor activity, but explicitly says DT2216 does not degrade BCL-2—the central target named in the claim. (LLM, conf=0.94)

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  • The therapeutic window of navitoclax is improved by degrading certain BCL-2 family members rather than only inhibiting their function.

    “the therapeutic window of navitoclax is improved by utilizing an approach that degrades certain BCL-2 family members instead of just inhibiting their function (76).”
  • DT2216 has shown promising antitumor activities in BCL-XL-dependent hematologic cancers as a single agent and in multiple solid tumors when combined with conventional chemotherapy.

    “DT2216 has shown promising antitumor activities in BCL-XL-dependent hematologic cancers as a single agent therapy and in multiple solid tumors when combined with conventional chemotherapy [8–10].”
  • DT2216 is a platelet-sparing BCL-XL PROTAC reported by our group.

    “Recently, our group has reported platelet-sparing targeting of BCL-XL by proteolysis targeting chimeras (PROTACs) exemplified by DT2216.”
  • This modification potentiates the antitumour activity of ABT263 while suppressing its side effects on platelets in which VHL is poorly expressed.

    “This potentiates the antitumour activity of ABT263 while suppressing its side effects on platelets in which VHL is poorly expressed [120].”

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Authors
Khan, S., Zhang, X., Lv, D., Zhang, Q., He, Y., Zhang, P., Liu, X., Thummuri, D., Yuan, Y., Wiegand, J. S., Pei, J., Zhang, W., Sharma, A., McCurdy, C. R., Kuruvilla, V. M., Baran, N., Ferrando, A. A., Kim, Y.-M., Rogojina, A., Houghton, P. J., Huang, G., Hromas, R., Konopleva, M., Zheng, G., & Zhou, D.
Affiliations
  • University of Florida (US)
  • The University of Texas MD Anderson Cancer Center (US)
  • Columbia University (US)
  • Children's Hospital Los Angeles (US)
  • The University of Texas at San Antonio Health Science Center (US)
Corresponding author
  • Zheng, Guangrong
  • Zhou, Daohong
Venue
Nature Medicine
Published
2019-12
Volume
25
Issue
12
Pages
1938-1947
ISSN
  • 1078-8956 (ISSN-L)
  • 1546-170X
OpenAlex
W2990669650
Cited by
688
References
63
Citations by year
2026: 98 · 2025: 127 · 2024: 116 · 2023: 103 · 2022: 105 · 2021: 83 · 2020: 55
FWCI
20.26
Type
journal article
Language
en
Open access
Locations
  • Nature Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • NIH
  • CPRIT
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
Bcl-xL, PROTACs, VHL E3 ubiquitin ligase, thrombocytopenia, navitoclax, platelet toxicity, leukemia, tumor xenografts, BCL-2 inhibitor, on-target toxicity
MeSH terms
Aniline Compounds, Animals, Antineoplastic Agents, Blood Platelets, Humans, Sulfonamides, Thrombocytopenia, Gene Expression Regulation, Neoplastic, bcl-X Protein, Mice, Von Hippel-Lindau Tumor Suppressor Protein, Proteolysis, Heterografts

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