ArticleMolecular pharmacology2014
Antileukemic activity and mechanism of drug resistance to the marine Salinispora tropica proteasome inhibitor salinosporamide A (Marizomib).
Article in Molecular pharmacology, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.
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Who cites it
20 citing papers in PubMed, 45 citations in OpenAlex.
- The Art of Domesticating Proteins: How Cancer Cells Adapt to Therapeutic and Environmental Stressors.International journal of molecular sciences · 2026Review
- The Ubiquitin-Proteasome System in Brain Disorders: Pathogenic Pathways, Post-Translational Tweaks, and Therapeutic Frontiers.Journal of neuroimmune pharmacology : the official journal of the Society on NeuroImmune Pharmacology · 2025Review
- Marizomib (Salinosporamide A) Promotes Apoptosis in A375 and G361 Melanoma Cancer Cells.Marine drugs · 2024Article
- Enzymatic assembly of the salinosporamide γ-lactam-β-lactone anticancer warhead.Nature chemical biology · 2022Article
- Revisiting Proteasome Inhibitors: Molecular Underpinnings of Their Development, Mechanisms of Resistance and Strategies to Overcome Anti-Cancer Drug Resistance.Molecules (Basel, Switzerland) · 2022Review
- Isolation of an Extract from the Soft Coral Symbiotic MicroorganismCurrent issues in molecular biology · 2021Article
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- Influence of Cultivation Conditions on the Sioxanthin Content and Antioxidative Protection Effect of a Crude Extract from the Vegetative Mycelium ofMarine drugs · 2021Article
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- Harnessing Gene Expression Profiles for the Identification of Ex Vivo Drug Response Genes in Pediatric Acute Myeloid Leukemia.Cancers · 2020Article
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- A focused structure-activity relationship study of psoralen-based immunoproteasome inhibitors.MedChemComm · 2019Article
- Bortezomib for the Treatment of Hematologic Malignancies: 15 Years Later.Drugs in R&D · 2019Review
- Positioning of proteasome inhibitors in therapy of solid malignancies.Cancer chemotherapy and pharmacology · 2018Review
- (Immuno)proteasomes as therapeutic target in acute leukemia.Cancer metastasis reviews · 2017Review
- Exocytosis of polyubiquitinated proteins in bortezomib-resistant leukemia cells: a role for MARCKS in acquired resistance to proteasome inhibitors.Oncotarget · 2016Article
- Platinum-containing compound platinum pyrithione is stronger and safer than cisplatin in cancer therapy.Biochemical pharmacology · 2016Article
- Natural compounds for pediatric cancer treatment.Naunyn-Schmiedeberg's archives of pharmacology · 2016Review
- Efficacy of panobinostat and marizomib in acute myeloid leukemia and bortezomib-resistant models.Leukemia research · 2015Article
Corrections and comments
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Authors and funding
11 authors at 2 institutions in 3 countries.
Funding
Abstract
Salinosporamide A (NPI-0052, marizomib) is a naturally occurring proteasome inhibitor derived from the marine actinobacterium Salinispora tropica, and represents a promising clinical agent in the treatment of hematologic malignancies. Recently, these actinobacteria were shown to harbor self-resistance properties to salinosporamide A by expressing redundant catalytically active mutants of the 20S proteasome β-subunit, reminiscent of PSMB5 mutations identified in cancer cells with acquired resistance to the founding proteasome inhibitor bortezomib (BTZ). Here, we assessed the growth inhibitory potential of salinosporamide A in human acute lymphocytic leukemia CCRF-CEM cells, and its 10-fold (CEM/BTZ7) and 123-fold (CEM/BTZ200) bortezomib-resistant sublines harboring PSMB5 mutations. Parental cells displayed sensitivity to salinosporamide A (IC50 = 5.1 nM), whereas their bortezomib-resistant sublines were 9- and 17-fold cross-resistant to salinosporamide A, respectively. Notably, combination experiments of salinosporamide A and bortezomib showed synergistic activity in CEM/BTZ200 cells. CEM cells gradually exposed to 20 nM salinosporamide A (CEM/S20) displayed stable 5-fold acquired resistance to salinosporamide A and were 3-fold cross-resistant to bortezomib. Consistent with the acquisition of a PSMB5 point mutation (M45V) in CEM/S20 cells, salinosporamide A displayed a markedly impaired capacity to inhibit β5-associated catalytic activity. Last, compared with parental CEM cells, CEM/S20 cells exhibited up to 2.5-fold upregulation of constitutive proteasome subunits, while retaining unaltered immunoproteasome subunit expression. In conclusion, salinosporamide A displayed potent antileukemic activity against bortezomib-resistant leukemia cells. β-Subunit point mutations as a common feature of acquired resistance to salinosporamide A and bortezomib in hematologic cells and S. tropica suggest an evolutionarily conserved mechanism of resistance to proteasome inhibitors.
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