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Aumann WK, Kazi R, Harrington AM, Wechsler DS. Novel-and Not So Novel-Inhibitors of the Multifunctional CRM1 Protein. Oncol Rev 2024; 18:1427497. [PMID: 39161560 PMCID: PMC11330842 DOI: 10.3389/or.2024.1427497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Accepted: 07/16/2024] [Indexed: 08/21/2024] Open
Abstract
Chromosome Region Maintenance 1 (CRM1), also known as Exportin 1 (XPO1), is a protein that is critical for transport of proteins and RNA to the cytoplasm through the nuclear pore complex. CRM1 inhibition with small molecule inhibitors is currently being studied in many cancers, including leukemias, solid organ malignancies and brain tumors. We review the structure of CRM1, its role in nuclear export, the current availability of CRM1 inhibitors, and the role of CRM1 in a number of distinct cellular processes. A deeper understanding of how CRM1 functions in nuclear export as well as other cellular processes may allow for the development of additional novel CRM1 inhibitors.
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Affiliation(s)
- Waitman K. Aumann
- Aflac Cancer and Blood Disorders Center, Children’s Healthcare of Atlanta, Atlanta, GA, United States
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, United States
| | - Rafi Kazi
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, University of Rochester Medical Center, Rochester, NY, United States
| | - Amanda M. Harrington
- Department of Pediatrics, University of Kentucky College of Medicine, Lexington, KY, United States
| | - Daniel S. Wechsler
- Aflac Cancer and Blood Disorders Center, Children’s Healthcare of Atlanta, Atlanta, GA, United States
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, United States
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Zhao J, Wu S, Wang D, Edwards H, Thibodeau J, Kim S, Stemmer P, Wang G, Jin J, Savasan S, Taub JW, Ge Y. Panobinostat sensitizes AraC-resistant AML cells to the combination of azacitidine and venetoclax. Biochem Pharmacol 2024:116065. [PMID: 38373594 DOI: 10.1016/j.bcp.2024.116065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 01/22/2024] [Accepted: 02/16/2024] [Indexed: 02/21/2024]
Abstract
The majority of acute myeloid leukemia (AML) patients respond to intensive induction therapy, consisting of cytarabine (AraC) and an anthracycline, though more than half experience relapse. Relapsed/refractory (R/R) AML patients are difficult to treat, and their clinical outcomes remain dismal. Venetoclax (VEN) in combination with azacitidine (AZA) has provided a promising treatment option for R/R AML, though the overall survival (OS) could be improved (OS ranges from 4.3 to 9.1 months). Overexpression of c-Myc is associated with chemoresistance in AML. Histone deacetylase (HDAC) inhibitors have been shown to suppress c-Myc and enhance the antileukemic activity of VEN, as well as AZA, though combination of all three has not been fully explored. In this study, we investigated the HDAC inhibitor, panobinostat, in combination with VEN + AZA against AraC-resistant AML cells. Panobinostat treatment downregulated c-Myc and Bcl-xL and upregulated Bim, which enhanced the antileukemic activity of VEN + AZA against AraC-resistant AML cells. In addition, panobinostat alone and in combination with VEN + AZA suppressed oxidative phosphorylation and/or glycolysis in AraC-resistant AML cells. These findings support further development of panobinostat in combination with VEN + AZA for the treatment of AraC-resistant AML.
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Affiliation(s)
- Jianlei Zhao
- National Engineering Laboratory for AIDS Vaccine, Key Laboratory for Molecular Enzymology and Engineering, The Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, PR China; Department of Oncology, Wayne State University School of Medicine, Detroit, MI 48201, USA; Molecular Therapeutics Program, Barbara Ann Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Shuangshuang Wu
- Department of Pediatric Hematology, The First Hospital of Jilin University, Changchun 130012, PR China
| | - Deying Wang
- The Tumor Center of the First Hospital of Jilin University, Changchun 130021, PR China
| | - Holly Edwards
- Department of Oncology, Wayne State University School of Medicine, Detroit, MI 48201, USA; Molecular Therapeutics Program, Barbara Ann Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Jenna Thibodeau
- Cancer Biology Graduate Program, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Seongho Kim
- Department of Oncology, Wayne State University School of Medicine, Detroit, MI 48201, USA; Molecular Therapeutics Program, Barbara Ann Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Paul Stemmer
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, Detroit, MI 48201, USA
| | - Guan Wang
- National Engineering Laboratory for AIDS Vaccine, Key Laboratory for Molecular Enzymology and Engineering, The Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, PR China
| | - Jingji Jin
- National Engineering Laboratory for AIDS Vaccine, Key Laboratory for Molecular Enzymology and Engineering, The Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, PR China
| | - Süreyya Savasan
- Department of Pediatrics, Wayne State University School of Medicine, Detroit, MI 48202, USA; Division of Pediatric Hematology and Oncology, Children's Hospital of Michigan, Detroit, MI 48202, USA; Department of Pediatrics, Central Michigan University College of Medicine, Mt. Pleasant, MI 48859, USA
| | - Jeffrey W Taub
- Cancer Biology Graduate Program, Wayne State University School of Medicine, Detroit, MI 48201, USA; Department of Pediatrics, Wayne State University School of Medicine, Detroit, MI 48202, USA; Division of Pediatric Hematology and Oncology, Children's Hospital of Michigan, Detroit, MI 48202, USA; Department of Pediatrics, Central Michigan University College of Medicine, Mt. Pleasant, MI 48859, USA.
| | - Yubin Ge
- Department of Oncology, Wayne State University School of Medicine, Detroit, MI 48201, USA; Molecular Therapeutics Program, Barbara Ann Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, MI 48201, USA; Cancer Biology Graduate Program, Wayne State University School of Medicine, Detroit, MI 48201, USA.
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Kumar R, Mendonca J, Shetty A, Yang Y, Owoyemi O, Wilson L, Boyapati K, Topiwala D, Thomas N, Nguyen H, Luo J, Paller CJ, Denmeade S, Carducci MA, Kachhap SK. CRM1 regulates androgen receptor stability and impacts DNA repair pathways in prostate cancer, independent of the androgen receptor. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.02.13.579966. [PMID: 38405771 PMCID: PMC10888881 DOI: 10.1101/2024.02.13.579966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/27/2024]
Abstract
Among the known nuclear exportins, CRM1 is the most studied prototype. Dysregulation of CRM1 occurs in many cancers, hence, understanding the role of CRM1 in cancer can help in developing synergistic therapeutics. The study investigates how CRM1 affects prostate cancer growth and survival. It examines the role of CRM1 in regulating androgen receptor (AR) and DNA repair in prostate cancer. Our findings reveal that CRM1 influences AR mRNA and protein stability, leading to a loss of AR protein upon CRM1 inhibition. Furthermore, it highlights the involvement of HSP90 alpha, a known AR chaperone, in the CRM1-dependent regulation of AR protein stability. The combination of CRM1 inhibition with an HSP90 inhibitor demonstrates potent effects on decreasing prostate cancer cell growth and survival. The study further explores the influence of CRM1 on DNA repair proteins and proposes a strategy of combining CRM1 inhibitors with DNA repair pathway inhibitors to decrease prostate cancer growth. Overall, the findings suggest that CRM1 plays a crucial role in prostate cancer growth, and a combination of inhibitors targeting CRM1 and DNA repair pathways could be a promising therapeutic strategy.
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Liu L, Song X, Dong W, Li Z, Guo D. Case report: Safety and efficacy of synergistic treatment using selinexor and azacitidine in patients with atypical chronic myeloid leukemia with resistance to decitabine. Front Oncol 2024; 14:1353818. [PMID: 38384813 PMCID: PMC10879427 DOI: 10.3389/fonc.2024.1353818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Accepted: 01/22/2024] [Indexed: 02/23/2024] Open
Abstract
Background Atypical chronic myeloid leukemia (aCML) is a BCR::ABL1 negative myelodysplastic/myeloproliferative neoplasm with poor overall survival. Some patients can be treated by allogeneic hematopoietic stem cell transplantation (allo-HSCT) from suitable donors. The effectiveness of decitabine or azacitidine (AZA) has recently been reported; however, their combined efficacy with selinexor has not yet been reported. Case description In this study, we report the case of a patient with aCML who was successfully treated with selinexor combined with AZA. A 67-year-old man with a history of gastric mucosa-associated lymphoid tissue (MALT) lymphoma was admitted to the hospital with fatigue and emaciation. He was diagnosed with aCML and no longer responded to decitabine treatment after undergoing seven cycles. The patient was subsequently administered hydroxyurea (HU), selinexor, and AZA. After four courses of combination therapy, his blood cell counts improved; he no longer required transfusions and was able to discontinue HU. The patient continued receiving selinexor and AZA without severe complications. This case is the first to show that combinatorial selinexor and AZA therapy can effectively treat aCML. Conclusion Our case sheds light on the importance of selinexor and AZA combined therapy in the exploration of new treatment strategies for aCML. Moreover, this treatment approach offers the possibility of bridging with allo-HSCT.
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Affiliation(s)
- Lu Liu
- Department of Hematology, Qilu Hospital (Qingdao) of Shandong University, Qingdao, China
| | - Xiaofeng Song
- Department of Hand and Foot Surgery, Qilu Hospital (Qingdao) of Shandong University, Qingdao, China
| | - Wenhao Dong
- Department of Hematology, Qilu Hospital (Qingdao) of Shandong University, Qingdao, China
| | - Zhao Li
- Department of Hematology, Qilu Hospital (Qingdao) of Shandong University, Qingdao, China
| | - Dongmei Guo
- Department of Hematology, Qilu Hospital (Qingdao) of Shandong University, Qingdao, China
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Deutzmann A, Sullivan DK, Dhanasekaran R, Li W, Chen X, Tong L, Mahauad-Fernandez WD, Bell J, Mosley A, Koehler AN, Li Y, Felsher DW. Nuclear to cytoplasmic transport is a druggable dependency in MYC-driven hepatocellular carcinoma. Nat Commun 2024; 15:963. [PMID: 38302473 PMCID: PMC10834515 DOI: 10.1038/s41467-024-45128-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 01/12/2024] [Indexed: 02/03/2024] Open
Abstract
The MYC oncogene is often dysregulated in human cancer, including hepatocellular carcinoma (HCC). MYC is considered undruggable to date. Here, we comprehensively identify genes essential for survival of MYChigh but not MYClow cells by a CRISPR/Cas9 genome-wide screen in a MYC-conditional HCC model. Our screen uncovers novel MYC synthetic lethal (MYC-SL) interactions and identifies most MYC-SL genes described previously. In particular, the screen reveals nucleocytoplasmic transport to be a MYC-SL interaction. We show that the majority of MYC-SL nucleocytoplasmic transport genes are upregulated in MYChigh murine HCC and are associated with poor survival in HCC patients. Inhibiting Exportin-1 (XPO1) in vivo induces marked tumor regression in an autochthonous MYC-transgenic HCC model and inhibits tumor growth in HCC patient-derived xenografts. XPO1 expression is associated with poor prognosis only in HCC patients with high MYC activity. We infer that MYC may generally regulate and require altered expression of nucleocytoplasmic transport genes for tumorigenesis.
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Affiliation(s)
- Anja Deutzmann
- Division of Oncology, Department of Medicine, Stanford University, Stanford, CA, 94305, USA
| | - Delaney K Sullivan
- Division of Oncology, Department of Medicine, Stanford University, Stanford, CA, 94305, USA
| | - Renumathy Dhanasekaran
- Division of Oncology, Department of Medicine, Stanford University, Stanford, CA, 94305, USA
- Division of Gastroenterology, Department of Medicine, Stanford University, Stanford, CA, 94305, USA
| | - Wei Li
- Center for Genetic Medicine Research, Children's National Hospital, Washington, DC, 20012, USA
- Department of Genomics and Precision Medicine, George Washington University, Washington, DC, 20012, USA
| | - Xinyu Chen
- Division of Oncology, Department of Medicine, Stanford University, Stanford, CA, 94305, USA
| | - Ling Tong
- Division of Oncology, Department of Medicine, Stanford University, Stanford, CA, 94305, USA
| | | | - John Bell
- Stanford Genome Technology Center, Stanford University, Stanford, CA, 94305, USA
| | - Adriane Mosley
- Division of Oncology, Department of Medicine, Stanford University, Stanford, CA, 94305, USA
| | - Angela N Koehler
- Koch Institute for Integrative Cancer Research at MIT, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Center for Precision Cancer Medicine, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA
| | - Yulin Li
- Division of Oncology, Department of Medicine, Stanford University, Stanford, CA, 94305, USA.
- Institute for Academic Medicine, Houston Methodist and Weill Cornell Medical College, Houston, TX, 77030, USA.
| | - Dean W Felsher
- Division of Oncology, Department of Medicine, Stanford University, Stanford, CA, 94305, USA.
- Department of Pathology, Stanford University, Stanford, CA, 94305, USA.
- Stanford Cancer Institute, Stanford University, Stanford, CA, 94305, USA.
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Newell S, van der Watt PJ, Leaner VD. Therapeutic targeting of nuclear export and import receptors in cancer and their potential in combination chemotherapy. IUBMB Life 2024; 76:4-25. [PMID: 37623925 PMCID: PMC10952567 DOI: 10.1002/iub.2773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 07/03/2023] [Indexed: 08/26/2023]
Abstract
Systemic modalities are crucial in the management of disseminated malignancies and liquid tumours. However, patient responses and tolerability to treatment are generally poor and those that enter remission often return with refractory disease. Combination therapies provide a methodology to overcome chemoresistance mechanisms and address dose-limiting toxicities. A deeper understanding of tumorigenic processes at the molecular level has brought a targeted therapy approach to the forefront of cancer research, and novel cancer biomarkers are being identified at a rapid rate, with some showing potential therapeutic benefits. The Karyopherin superfamily of proteins is soluble receptors that mediate nucleocytoplasmic shuttling of proteins and RNAs, and recently, nuclear transport receptors have been recognized as novel anticancer targets. Inhibitors against nuclear export have been approved for clinical use against certain cancer types, whereas inhibitors against nuclear import are in preclinical stages of investigation. Mechanistically, targeting nucleocytoplasmic shuttling has shown to abrogate oncogenic signalling and restore tumour suppressor functions through nuclear sequestration of relevant proteins and mRNAs. Hence, nuclear transport inhibitors display broad spectrum anticancer activity and harbour potential to engage in synergistic interactions with a wide array of cytotoxic agents and other targeted agents. This review is focussed on the most researched nuclear transport receptors in the context of cancer, XPO1 and KPNB1, and highlights how inhibitors targeting these receptors can enhance the therapeutic efficacy of standard of care therapies and novel targeted agents in a combination therapy approach. Furthermore, an updated review on the therapeutic targeting of lesser characterized karyopherin proteins is provided and resistance to clinically approved nuclear export inhibitors is discussed.
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Affiliation(s)
- Stella Newell
- Division of Medical Biochemistry and Structural Biology, Department of Integrative Biomedical Sciences, Faculty of Health SciencesUniversity of Cape TownCape TownSouth Africa
| | - Pauline J. van der Watt
- Division of Medical Biochemistry and Structural Biology, Department of Integrative Biomedical Sciences, Faculty of Health SciencesUniversity of Cape TownCape TownSouth Africa
- Institute of Infectious Diseases and Molecular Medicine, University of Cape TownCape TownSouth Africa
| | - Virna D. Leaner
- Division of Medical Biochemistry and Structural Biology, Department of Integrative Biomedical Sciences, Faculty of Health SciencesUniversity of Cape TownCape TownSouth Africa
- UCT/SAMRC Gynaecological Cancer Research CentreUniversity of Cape TownCape TownSouth Africa
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