» Articles » PMID: 38893249

Identifying Targetable Vulnerabilities to Circumvent or Overcome Venetoclax Resistance in Diffuse Large B-Cell Lymphoma

Overview
Journal Cancers (Basel)
Publisher MDPI
Specialty Oncology
Date 2024 Jun 19
PMID 38893249
Authors
Affiliations
Soon will be listed here.
Abstract

Clinical trials with single-agent venetoclax/ABT-199 (anti-apoptotic BCL2 inhibitor) revealed that diffuse large B-cell lymphoma (DLBCL) is not solely dependent on BCL2 for survival. Gaining insight into pathways/proteins that increase venetoclax sensitivity or unique vulnerabilities in venetoclax-resistant DLBCL would provide new potential treatment avenues. Therefore, we generated acquired venetoclax-resistant DLBCL cells and evaluated these together with intrinsically venetoclax-resistant and -sensitive DLBCL lines. We identified resistance mechanisms, including alterations in BCL2 family members that differed between intrinsic and acquired venetoclax resistance and increased dependencies on specific pathways. Although combination treatments with BCL2 family member inhibitors may overcome venetoclax resistance, RNA-sequencing and drug/compound screens revealed that venetoclax-resistant DLBCL cells, including those with TP53 mutation, had a preferential dependency on oxidative phosphorylation. Mitochondrial electron transport chain complex I inhibition induced venetoclax-resistant, but not venetoclax-sensitive, DLBCL cell death. Inhibition of IDH2 (mitochondrial redox regulator) synergistically overcame venetoclax resistance. Additionally, both acquired and intrinsic venetoclax-resistant DLBCL cells were similarly sensitive to inhibitors of transcription, B-cell receptor signaling, and class I histone deacetylases. These approaches were also effective in DLBCL, follicular, and marginal zone lymphoma patient samples. Our results reveal there are multiple ways to circumvent or overcome the diverse venetoclax resistance mechanisms in DLBCL and other B-cell lymphomas and identify critical targetable pathways for future clinical investigations.

References
1.
Burger J, Wiestner A . Targeting B cell receptor signalling in cancer: preclinical and clinical advances. Nat Rev Cancer. 2018; 18(3):148-167. DOI: 10.1038/nrc.2017.121. View

2.
Zhao S, Kanagal-Shamanna R, Navsaria L, Ok C, Zhang S, Nomie K . Efficacy of venetoclax in high risk relapsed mantle cell lymphoma (MCL) - outcomes and mutation profile from venetoclax resistant MCL patients. Am J Hematol. 2020; 95(6):623-629. DOI: 10.1002/ajh.25796. View

3.
Wright G, Huang D, Phelan J, Coulibaly Z, Roulland S, Young R . A Probabilistic Classification Tool for Genetic Subtypes of Diffuse Large B Cell Lymphoma with Therapeutic Implications. Cancer Cell. 2020; 37(4):551-568.e14. PMC: 8459709. DOI: 10.1016/j.ccell.2020.03.015. View

4.
Thomalla D, Beckmann L, Grimm C, Oliverio M, Meder L, Herling C . Deregulation and epigenetic modification of BCL2-family genes cause resistance to venetoclax in hematologic malignancies. Blood. 2022; 140(20):2113-2126. PMC: 10653032. DOI: 10.1182/blood.2021014304. View

5.
Szlavik Z, Ondi L, Csekei M, Paczal A, Szabo Z, Radics G . Structure-Guided Discovery of a Selective Mcl-1 Inhibitor with Cellular Activity. J Med Chem. 2019; 62(15):6913-6924. DOI: 10.1021/acs.jmedchem.9b00134. View