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Oiwa K, Hosono N, Nishi R, Scotto L, O'Connor OA, Yamauchi T. Characterization of newly established Pralatrexate-resistant cell lines and the mechanisms of resistance. BMC Cancer 2021; 21:879. [PMID: 34332580 PMCID: PMC8325835 DOI: 10.1186/s12885-021-08607-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 07/16/2021] [Indexed: 11/20/2022] Open
Abstract
Background Pralatrexate (PDX) is a novel antifolate approved for the treatment of patients with relapsed/refractory peripheral T-cell lymphoma, but some patients exhibit intrinsic resistance or develop acquired resistance. Here, we evaluated the mechanisms underlying acquired resistance to PDX and explored potential therapeutic strategies to overcome PDX resistance. Methods To investigate PDX resistance, we established two PDX-resistant T-lymphoblastic leukemia cell lines (CEM and MOLT4) through continuous exposure to increasing doses of PDX. The resistance mechanisms were evaluated by measuring PDX uptake, apoptosis induction and folate metabolism-related protein expression. We also applied gene expression analysis and methylation profiling to identify the mechanisms of resistance. We then explored rational drug combinations using a spheroid (3D)-culture assay. Results Compared with their parental cells, PDX-resistant cells exhibited a 30-fold increase in half-maximal inhibitory concentration values. Induction of apoptosis by PDX was significantly decreased in both PDX-resistant cell lines. Intracellular uptake of [14C]-PDX decreased in PDX-resistant CEM cells but not in PDX-resistant MOLT4 cells. There was no significant change in expression of dihydrofolate reductase (DHFR) or folylpolyglutamate synthetase (FPGS). Gene expression array analysis revealed that DNA-methyltransferase 3β (DNMT3B) expression was significantly elevated in both cell lines. Gene set enrichment analysis revealed that adipogenesis and mTORC1 signaling pathways were commonly upregulated in both resistant cell lines. Moreover, CpG island hypermethylation was observed in both PDX resistant cells lines. In the 3D-culture assay, decitabine (DAC) plus PDX showed synergistic effects in PDX-resistant cell lines compared with parental lines. Conclusions The resistance mechanisms of PDX were associated with reduced cellular uptake of PDX and/or overexpression of DNMT3B. Epigenetic alterations were also considered to play a role in the resistance mechanism. The combination of DAC and PDX exhibited synergistic activity, and thus, this approach might improve the clinical efficacy of PDX. Supplementary Information The online version contains supplementary material available at 10.1186/s12885-021-08607-9.
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Affiliation(s)
- Kana Oiwa
- Department of Hematology and Oncology, Faculty of Medical Sciences, University of Fukui, 23-3 Matsuokashimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan
| | - Naoko Hosono
- Department of Hematology and Oncology, Faculty of Medical Sciences, University of Fukui, 23-3 Matsuokashimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan.
| | - Rie Nishi
- Department of Hematology and Oncology, Faculty of Medical Sciences, University of Fukui, 23-3 Matsuokashimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan
| | - Luigi Scotto
- The Center of Lymphoid Malignancy, Columbia University Medical Center, College of Physicians and Surgeons, 630 West 168th St, New York, NY, 10032, USA
| | - Owen A O'Connor
- The Center of Lymphoid Malignancy, Columbia University Medical Center, College of Physicians and Surgeons, 630 West 168th St, New York, NY, 10032, USA.,Department of Medicine, Division of Hematology and Oncology, University of Virginia, 1215 Lee Street, Charlottesville, VA, 22903, USA
| | - Takahiro Yamauchi
- Department of Hematology and Oncology, Faculty of Medical Sciences, University of Fukui, 23-3 Matsuokashimoaizuki, Eiheiji-cho, Yoshida-gun, Fukui, 910-1193, Japan
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Scotto L, Kinahan C, Casadei B, Mangone M, Douglass E, Murty VV, Marchi E, Ma H, George C, Montanari F, Califano A, O'Connor OA. Generation of pralatrexate resistant T-cell lymphoma lines reveals two patterns of acquired drug resistance that is overcome with epigenetic modifiers. Genes Chromosomes Cancer 2020; 59:639-651. [PMID: 32614991 PMCID: PMC7540375 DOI: 10.1002/gcc.22884] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 06/26/2020] [Accepted: 06/27/2020] [Indexed: 12/14/2022] Open
Abstract
While pralatrexate (PDX) has been successfully developed for the treatment of T-cell lymphoma, the mechanistic basis for its T-cell selectivity and acquired resistance remains elusive. In an effort to potentially identify synergistic combinations that might circumnavigate or delay acquired PDX resistance, we generated resistant cells lines over a broad concentration range. PDX-resistant cell lines H9-12 and H9-200 were developed, each exhibiting an IC50 of 35 and over 1000 nM, respectively. These lines were established in vitro from parental H9 cells. Expression analysis of the proteins known to be important determinants of antifolate pharmacology revealed increase expression of dihydrofolate reductase (DHFR) due to gene amplification, and reduced folate carrier1 downregulation, as the putative mechanisms of resistance in H9-12 and H9-200 cells. Cross resistance was only seen with methotrexate but not with romidepsin, azacitidine (AZA), decitabine, gemcitabine, doxorubicin, or bortezomib. Resistance to PDX was reversed by pretreatment with hypomethylating agents in a concentration-dependent fashion. Comparison of gene expression profiles of parental and resistant cell lines confirmed markedly different patterns of gene expression, and identified the dual specificity phosphatase four (DUSP4) as one of the molecular target of PDX activity. Reduced STAT5 phosphorylation following exposure to PDX was observed in the H9 but not in the H9-12 and H9-200 cells. These data suggest that combination with hypomethylating agents could be potent, and that DUSP4 and STAT5 could represent putative biomarkers of PDX activity.
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Affiliation(s)
- Luigi Scotto
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York, USA.,Division of Experimental Therapeutics, Columbia University Medical Center, New York, New York, USA
| | - Cristina Kinahan
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York, USA.,Division of Experimental Therapeutics, Columbia University Medical Center, New York, New York, USA
| | - Beatrice Casadei
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York, USA.,Division of Experimental Therapeutics, Columbia University Medical Center, New York, New York, USA
| | - Michael Mangone
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York, USA.,Division of Experimental Therapeutics, Columbia University Medical Center, New York, New York, USA
| | - Eugene Douglass
- Department of Systems Biology, Columbia University Medical Center, New York, New York, USA
| | - Vundavalli V Murty
- Department of Pathology and Cell Biology, Columbia University Medical Center, New York, New York, USA
| | - Enrica Marchi
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York, USA.,Division of Experimental Therapeutics, Columbia University Medical Center, New York, New York, USA
| | - Helen Ma
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York, USA.,Division of Experimental Therapeutics, Columbia University Medical Center, New York, New York, USA
| | - Changchun George
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York, USA.,Division of Experimental Therapeutics, Columbia University Medical Center, New York, New York, USA
| | - Francesca Montanari
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York, USA.,Division of Experimental Therapeutics, Columbia University Medical Center, New York, New York, USA
| | - Andrea Califano
- Department of Systems Biology, Columbia University Medical Center, New York, New York, USA
| | - Owen A O'Connor
- Center for Lymphoid Malignancies, Columbia University Medical Center, New York, New York, USA
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