1
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Isozaki H, Sakhtemani R, Abbasi A, Nikpour N, Stanzione M, Oh S, Langenbucher A, Monroe S, Su W, Cabanos HF, Siddiqui FM, Phan N, Jalili P, Timonina D, Bilton S, Gomez-Caraballo M, Archibald HL, Nangia V, Dionne K, Riley A, Lawlor M, Banwait MK, Cobb RG, Zou L, Dyson NJ, Ott CJ, Benes C, Getz G, Chan CS, Shaw AT, Gainor JF, Lin JJ, Sequist LV, Piotrowska Z, Yeap BY, Engelman JA, Lee JJK, Maruvka YE, Buisson R, Lawrence MS, Hata AN. Therapy-induced APOBEC3A drives evolution of persistent cancer cells. Nature 2023; 620:393-401. [PMID: 37407818 PMCID: PMC10804446 DOI: 10.1038/s41586-023-06303-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 06/08/2023] [Indexed: 07/07/2023]
Abstract
Acquired drug resistance to anticancer targeted therapies remains an unsolved clinical problem. Although many drivers of acquired drug resistance have been identified1-4, the underlying molecular mechanisms shaping tumour evolution during treatment are incompletely understood. Genomic profiling of patient tumours has implicated apolipoprotein B messenger RNA editing catalytic polypeptide-like (APOBEC) cytidine deaminases in tumour evolution; however, their role during therapy and the development of acquired drug resistance is undefined. Here we report that lung cancer targeted therapies commonly used in the clinic can induce cytidine deaminase APOBEC3A (A3A), leading to sustained mutagenesis in drug-tolerant cancer cells persisting during therapy. Therapy-induced A3A promotes the formation of double-strand DNA breaks, increasing genomic instability in drug-tolerant persisters. Deletion of A3A reduces APOBEC mutations and structural variations in persister cells and delays the development of drug resistance. APOBEC mutational signatures are enriched in tumours from patients with lung cancer who progressed after extended responses to targeted therapies. This study shows that induction of A3A in response to targeted therapies drives evolution of drug-tolerant persister cells, suggesting that suppression of A3A expression or activity may represent a potential therapeutic strategy in the prevention or delay of acquired resistance to lung cancer targeted therapy.
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Affiliation(s)
- Hideko Isozaki
- Massachusetts General Hospital Cancer Center, Boston, MA, USA.
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
| | - Ramin Sakhtemani
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Ammal Abbasi
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | - Naveed Nikpour
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | | | - Sunwoo Oh
- Department of Biological Chemistry, Center for Epigenetics and Metabolism, Chao Family Comprehensive Cancer Center, School of Medicine, University of California Irvine, Irvine, CA, USA
| | | | - Susanna Monroe
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | - Wenjia Su
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | - Heidie Frisco Cabanos
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | | | - Nicole Phan
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | - Pégah Jalili
- Department of Biological Chemistry, Center for Epigenetics and Metabolism, Chao Family Comprehensive Cancer Center, School of Medicine, University of California Irvine, Irvine, CA, USA
| | - Daria Timonina
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | - Samantha Bilton
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | | | | | - Varuna Nangia
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | - Kristin Dionne
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | - Amanda Riley
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | - Matthew Lawlor
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | | | - Rosemary G Cobb
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
| | - Lee Zou
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC, USA
| | - Nicholas J Dyson
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Christopher J Ott
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Cyril Benes
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Gad Getz
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
- Department of Pathology, Massachusetts General Hospital, Boston, MA, USA
- Department of Pathology, Harvard Medical School, Boston, MA, USA
| | - Chang S Chan
- Department of Medicine, Rutgers Robert Wood Johnson Medical School and Center for Systems and Computational Biology, Rutgers Cancer Institute, New Brunswick, NJ, USA
| | - Alice T Shaw
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Justin F Gainor
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Jessica J Lin
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Lecia V Sequist
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Zofia Piotrowska
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Beow Y Yeap
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Jeffrey A Engelman
- Massachusetts General Hospital Cancer Center, Boston, MA, USA
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Jake June-Koo Lee
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Yosef E Maruvka
- Faculty of Biotechnology and Food Engineering, Lorey Loki Center for Life Science and Engineering, Technion, Haifa, Israel
| | - Rémi Buisson
- Department of Biological Chemistry, Center for Epigenetics and Metabolism, Chao Family Comprehensive Cancer Center, School of Medicine, University of California Irvine, Irvine, CA, USA
- Department of Pharmaceutical Sciences, School of Pharmacy & Pharmaceutical Sciences, University of California Irvine, Irvine, CA, USA
| | - Michael S Lawrence
- Massachusetts General Hospital Cancer Center, Boston, MA, USA.
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
- Broad Institute of MIT and Harvard, Cambridge, MA, USA.
| | - Aaron N Hata
- Massachusetts General Hospital Cancer Center, Boston, MA, USA.
- Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
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2
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Hoffman TE, Nangia V, Ill CR, Passanisi VJ, Armstrong C, Yang C, Spencer SL. Multiple cancers escape from multiple MAPK pathway inhibitors and use DNA replication stress signaling to tolerate aberrant cell cycles. Sci Signal 2023; 16:eade8744. [PMID: 37527351 DOI: 10.1126/scisignal.ade8744] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 07/13/2023] [Indexed: 08/03/2023]
Abstract
Many cancers harbor pro-proliferative mutations of the mitogen-activated protein kinase (MAPK) pathway. In BRAF-driven melanoma cells treated with BRAF inhibitors, subpopulations of cells escape drug-induced quiescence through a nongenetic manner of adaptation and resume slow proliferation. Here, we found that this phenomenon is common to many cancer types driven by EGFR, KRAS, or BRAF mutations in response to multiple, clinically approved MAPK pathway inhibitors. In 2D cultures and 3D spheroid models of various cancer cell lines, a subset of cells escaped drug-induced quiescence within 4 days to resume proliferation. These "escapee" cells exhibited DNA replication deficits, accumulated DNA lesions, and mounted a stress response that depended on the ataxia telangiectasia and RAD3-related (ATR) kinase. We further identified that components of the Fanconi anemia (FA) DNA repair pathway are recruited to sites of mitotic DNA synthesis (MiDAS) in escapee cells, enabling successful completion of cell division. Analysis of patient tumor samples and clinical data correlated disease progression with an increase in DNA replication stress response factors. Our findings suggest that many MAPK pathway-mutant cancers rapidly escape drug action and that suppressing early stress tolerance pathways may achieve more durable clinical responses to MAPK pathway inhibitors.
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Affiliation(s)
- Timothy E Hoffman
- Department of Biochemistry and Biofrontiers Institute, University of Colorado Boulder, Boulder, CO 80303, USA
| | - Varuna Nangia
- Department of Biochemistry and Biofrontiers Institute, University of Colorado Boulder, Boulder, CO 80303, USA
- Medical Scientist Training Program, University of Colorado-Anschutz Medical School, Aurora, CO 80045, USA
| | - C Ryland Ill
- Department of Biochemistry and Biofrontiers Institute, University of Colorado Boulder, Boulder, CO 80303, USA
| | - Victor J Passanisi
- Department of Biochemistry and Biofrontiers Institute, University of Colorado Boulder, Boulder, CO 80303, USA
| | - Claire Armstrong
- Department of Biochemistry and Biofrontiers Institute, University of Colorado Boulder, Boulder, CO 80303, USA
| | - Chen Yang
- Department of Biochemistry and Biofrontiers Institute, University of Colorado Boulder, Boulder, CO 80303, USA
- Molecular Cellular and Developmental Biology, University of Colorado Boulder, Boulder, CO 80303, USA
| | - Sabrina L Spencer
- Department of Biochemistry and Biofrontiers Institute, University of Colorado Boulder, Boulder, CO 80303, USA
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3
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Arora M, Moser J, Hoffman TE, Watts LP, Min M, Musteanu M, Rong Y, Ill CR, Nangia V, Schneider J, Sanclemente M, Lapek J, Nguyen L, Niessen S, Dann S, VanArsdale T, Barbacid M, Miller N, Spencer SL. Rapid adaptation to CDK2 inhibition exposes intrinsic cell-cycle plasticity. Cell 2023; 186:2628-2643.e21. [PMID: 37267950 DOI: 10.1016/j.cell.2023.05.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 10/10/2022] [Accepted: 05/10/2023] [Indexed: 06/04/2023]
Abstract
CDK2 is a core cell-cycle kinase that phosphorylates many substrates to drive progression through the cell cycle. CDK2 is hyperactivated in multiple cancers and is therefore an attractive therapeutic target. Here, we use several CDK2 inhibitors in clinical development to interrogate CDK2 substrate phosphorylation, cell-cycle progression, and drug adaptation in preclinical models. Whereas CDK1 is known to compensate for loss of CDK2 in Cdk2-/- mice, this is not true of acute inhibition of CDK2. Upon CDK2 inhibition, cells exhibit a rapid loss of substrate phosphorylation that rebounds within several hours. CDK4/6 activity backstops inhibition of CDK2 and sustains the proliferative program by maintaining Rb1 hyperphosphorylation, active E2F transcription, and cyclin A2 expression, enabling re-activation of CDK2 in the presence of drug. Our results augment our understanding of CDK plasticity and indicate that co-inhibition of CDK2 and CDK4/6 may be required to suppress adaptation to CDK2 inhibitors currently under clinical assessment.
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Affiliation(s)
- Mansi Arora
- Department of Biochemistry and BioFrontiers Institute, University of Colorado-Boulder, Boulder, CO 80303, USA
| | - Justin Moser
- Department of Biochemistry and BioFrontiers Institute, University of Colorado-Boulder, Boulder, CO 80303, USA
| | - Timothy E Hoffman
- Department of Biochemistry and BioFrontiers Institute, University of Colorado-Boulder, Boulder, CO 80303, USA
| | - Lotte P Watts
- Department of Biochemistry and BioFrontiers Institute, University of Colorado-Boulder, Boulder, CO 80303, USA
| | - Mingwei Min
- Department of Biochemistry and BioFrontiers Institute, University of Colorado-Boulder, Boulder, CO 80303, USA; Guangzhou Laboratory, Guangzhou, Guangdong, China
| | - Monica Musteanu
- Experimental Oncology Group, Molecular Oncology Programme, Spanish National Cancer Research Centre, Madrid, Spain; Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Yao Rong
- Department of Biochemistry and BioFrontiers Institute, University of Colorado-Boulder, Boulder, CO 80303, USA; Department of Molecular, Cellular, and Developmental Biology and BioFrontiers Institute, University of Colorado-Boulder, Boulder, CO 80303, USA
| | - C Ryland Ill
- Department of Biochemistry and BioFrontiers Institute, University of Colorado-Boulder, Boulder, CO 80303, USA
| | - Varuna Nangia
- Department of Biochemistry and BioFrontiers Institute, University of Colorado-Boulder, Boulder, CO 80303, USA
| | - Jordan Schneider
- Department of Biochemistry and BioFrontiers Institute, University of Colorado-Boulder, Boulder, CO 80303, USA
| | - Manuel Sanclemente
- Experimental Oncology Group, Molecular Oncology Programme, Spanish National Cancer Research Centre, Madrid, Spain
| | - John Lapek
- Oncology Research & Development, Pfizer Worldwide Research & Development, San Diego, CA 92121, USA
| | - Lisa Nguyen
- Oncology Research & Development, Pfizer Worldwide Research & Development, San Diego, CA 92121, USA
| | - Sherry Niessen
- Oncology Research & Development, Pfizer Worldwide Research & Development, San Diego, CA 92121, USA
| | - Stephen Dann
- Oncology Research & Development, Pfizer Worldwide Research & Development, San Diego, CA 92121, USA
| | - Todd VanArsdale
- Oncology Research & Development, Pfizer Worldwide Research & Development, San Diego, CA 92121, USA
| | - Mariano Barbacid
- Experimental Oncology Group, Molecular Oncology Programme, Spanish National Cancer Research Centre, Madrid, Spain; Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Nichol Miller
- Oncology Research & Development, Pfizer Worldwide Research & Development, San Diego, CA 92121, USA
| | - Sabrina L Spencer
- Department of Biochemistry and BioFrontiers Institute, University of Colorado-Boulder, Boulder, CO 80303, USA.
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Hoffman TE, Yang C, Nangia V, Ill CR, Spencer SL. Abstract 3865: Multiple cancer types rapidly escape from multiple MAPK inhibitors to generate mutagenesis-prone subpopulations. Cancer Res 2023. [DOI: 10.1158/1538-7445.am2023-3865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
Abstract
Abstract
Many cancers harbor pro-proliferative mutations of the mitogen-activated protein kinase (MAPK) pathway and many targeted inhibitors now exist for clinical use, but drug resistance remains a major issue. We previously showed that BRAF-driven melanoma cells treated with BRAF inhibitors can non-genetically adapt to drug within 3-4 days to escape quiescence and resume slow proliferation. Here we show that this phenomenon is not unique to melanomas treated with BRAF inhibitors but rather is widespread across many clinical MAPK inhibitors and cancer types driven by EGFR, KRAS, and BRAF mutations. In all treatment contexts examined, a subset of cells can escape drug-induced quiescence within four days to resume proliferation. These escapee cells broadly experience aberrant DNA replication, accumulate DNA lesions, spend longer in G2-M cell cycle phases, and mount an ATR-dependent stress response. We further identify the Fanconi anemia (FA) DNA repair pathway as critical for successful mitotic completion in escapees. Long-term cultures, patient samples, and clinical data demonstrate a broad dependency on ATR- and FA-mediated stress tolerance. Together, these results highlight the pervasiveness with which MAPK-mutant cancers are able to rapidly escape drug and the importance of suppressing early stress tolerance pathways to potentially achieve more durable clinical responses to targeted MAPK pathway inhibitors.
Citation Format: Timothy E. Hoffman, Chen Yang, Varuna Nangia, Christopher Ryland Ill, Sabrina L. Spencer. Multiple cancer types rapidly escape from multiple MAPK inhibitors to generate mutagenesis-prone subpopulations. [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 3865.
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Affiliation(s)
| | - Chen Yang
- 1University of Colorado, Boulder, CO
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5
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Hoffman TE, Yang C, Nangia V, Ill CR, Spencer SL. Multiple cancer types rapidly escape from multiple MAPK inhibitors to generate mutagenesis-prone subpopulations. bioRxiv 2023:2023.03.17.533211. [PMID: 36993538 PMCID: PMC10055235 DOI: 10.1101/2023.03.17.533211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
Many cancers harbor pro-proliferative mutations of the mitogen-activated protein kinase (MAPK) pathway and many targeted inhibitors now exist for clinical use, but drug resistance remains a major issue. We recently showed that BRAF-driven melanoma cells treated with BRAF inhibitors can non-genetically adapt to drug within 3-4 days to escape quiescence and resume slow proliferation. Here we show that this phenomenon is not unique to melanomas treated with BRAF inhibitors but rather is widespread across many clinical MAPK inhibitors and cancer types driven by EGFR, KRAS, and BRAF mutations. In all treatment contexts examined, a subset of cells can escape drug-induced quiescence within four days to resume proliferation. These escapee cells broadly experience aberrant DNA replication, accumulate DNA lesions, spend longer in G2-M cell cycle phases, and mount an ATR-dependent stress response. We further identify the Fanconi anemia (FA) DNA repair pathway as critical for successful mitotic completion in escapees. Long-term cultures, patient samples, and clinical data demonstrate a broad dependency on ATR- and FA-mediated stress tolerance. Together, these results highlight the pervasiveness with which MAPK-mutant cancers are able to rapidly escape drug and the importance of suppressing early stress tolerance pathways to potentially achieve more durable clinical responses to targeted MAPK pathway inhibitors.
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6
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Nangia V, O'Connell J, Chopra K, Qing Y, Reppert C, Chai CM, Bhasiin K, Colodner KJ. Genetic reduction of tyramine β hydroxylase suppresses Tau toxicity in a Drosophila model of tauopathy. Neurosci Lett 2021; 755:135937. [PMID: 33910059 DOI: 10.1016/j.neulet.2021.135937] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 04/23/2021] [Accepted: 04/23/2021] [Indexed: 01/21/2023]
Abstract
Tauopathies are a class of neurodegenerative diseases characterized by the abnormal phosphorylation and accumulation of the microtubule-associated protein, Tau. These diseases are associated with degeneration and dysfunction of the noradrenergic system, a critical regulator of memory, locomotion, and the fight or flight response. Though Tau pathology accumulates early in noradrenergic neurons, the relationship between noradrenaline signaling and tauopathy pathogenesis remains unclear. The fruit fly, Drosophila melanogaster, is a valuable model organism commonly used to investigate factors that promote Tau-mediated degeneration. Moreover, Drosophila contain the biogenic amine, octopamine, which is the functional homolog to noradrenaline. Using a Drosophila model of tauopathy, we conducted a candidate modifier screen targeting tyramine β hydroxylase (tβh), the enzyme that controls the production of octopamine in the fly, to determine if levels of this enzyme modulate Tau-induced degeneration in the fly eye. We found that genetic reduction of tβh suppresses Tau toxicity, independent of Tau phosphorylation. These findings show that reduction of tβh, a critical enzyme in the octopaminergic pathway, suppresses Tau pathogenicity and establishes an interaction that can be further utilized to determine the relationship between noradrenergic-like signaling and Tau toxicity in Drosophila.
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Affiliation(s)
- Varuna Nangia
- Program in Neuroscience & Behavior, Mount Holyoke College, South Hadley, MA, USA
| | - Julia O'Connell
- Program in Neuroscience & Behavior, Mount Holyoke College, South Hadley, MA, USA
| | - Kusha Chopra
- Program in Neuroscience & Behavior, Mount Holyoke College, South Hadley, MA, USA
| | - Yaling Qing
- Program in Neuroscience & Behavior, Mount Holyoke College, South Hadley, MA, USA
| | - Camille Reppert
- Program in Neuroscience & Behavior, Mount Holyoke College, South Hadley, MA, USA
| | - Cynthia M Chai
- Program in Neuroscience & Behavior, Mount Holyoke College, South Hadley, MA, USA
| | - Kesshni Bhasiin
- Program in Neuroscience & Behavior, Mount Holyoke College, South Hadley, MA, USA
| | - Kenneth J Colodner
- Program in Neuroscience & Behavior, Mount Holyoke College, South Hadley, MA, USA.
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7
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Knitz MW, Bickett TE, Darragh LB, Oweida AJ, Bhatia S, Van Court B, Bhuvane S, Piper M, Gadwa J, Mueller AC, Nguyen D, Nangia V, Osborne DG, Bai X, Ferrara SE, Boss MK, Goodspeed A, Burchill MA, Tamburini BAJ, Chan ED, Pickering CR, Clambey ET, Karam SD. Targeting resistance to radiation-immunotherapy in cold HNSCCs by modulating the Treg-dendritic cell axis. J Immunother Cancer 2021; 9:e001955. [PMID: 33883256 PMCID: PMC8061827 DOI: 10.1136/jitc-2020-001955] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/10/2021] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Numerous trials combining radiation therapy (RT) and immunotherapy in head and neck squamous cell carcinoma (HNSCC) are failing. Using preclinical immune cold models of HNSCC resistant to RT-immune checkpoint inhibitors, we investigate therapeutic approaches of overcoming such resistance by examining the differential microenvironmental response to RT. METHODS We subjected two HPV-negative orthotopic mouse models of HNSCC to combination RT, regulatory T cells (Treg) depletion, and/or CD137 agonism. Tumor growth was measured and intratumorous and lymph node immune populations were compared among treatment groups. Human gene sets, genetically engineered mouse models DEREG and BATF3-/-, flow and time-of-flight cytometry, RNA-Seq, Treg adoptive transfer studies, and in vitro experiments were used to further evaluate the role of dendritic cells (DCs) and Tregs in these treatments. RESULTS In MOC2 orthotopic tumors, we find no therapeutic benefit to targeting classically defined immunosuppressive myeloids, which increase with RT. In these radioresistant tumors, supplementing combination RT and Treg depletion with anti-CD137 agonism stimulates CD103+ DC activation in tumor-draining lymph nodes as characterized by increases in CD80+ and CCR7+ DCs, resulting in a CD8 T cell-dependent response. Simultaneously, Tregs are reprogrammed to an effector phenotype demonstrated by increases in interferonγ+, tumor necrosis factorα+, PI3K+, pAKT+ and Eomes+ populations as well as decreases in CTLA4+ and NRP-1+ populations. Tumor eradication is observed when RT is increased to an 8 Gy x 5 hypofractionated regimen and combined with anti-CD25+ anti-CD137 treatment. In a human gene set from oral squamous cell carcinoma tumors, high Treg number is associated with earlier recurrence. CONCLUSIONS Regulating Treg functionality and DC activation status within the lymph node is critical for generating a T cell effector response in these highly radioresistant tumors. These findings underscore the plasticity of Tregs and represent a new therapeutic opportunity for reprogramming the tumor microenvironment in HNSCCs resistant to conventional radioimmunotherapy approaches.
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MESH Headings
- Animals
- Antineoplastic Agents, Immunological/pharmacology
- Basic-Leucine Zipper Transcription Factors/genetics
- Basic-Leucine Zipper Transcription Factors/metabolism
- Cell Line, Tumor
- Combined Modality Therapy
- Dendritic Cells/drug effects
- Dendritic Cells/immunology
- Dendritic Cells/metabolism
- Drug Resistance, Neoplasm
- Head and Neck Neoplasms/immunology
- Head and Neck Neoplasms/metabolism
- Head and Neck Neoplasms/pathology
- Head and Neck Neoplasms/therapy
- Immune Checkpoint Inhibitors/pharmacology
- Immunotherapy
- Interleukin-2 Receptor alpha Subunit/antagonists & inhibitors
- Interleukin-2 Receptor alpha Subunit/metabolism
- Lymphocyte Depletion
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Mice, Knockout
- Phenotype
- Radiation Dose Hypofractionation
- Radiation Tolerance
- Repressor Proteins/genetics
- Repressor Proteins/metabolism
- Squamous Cell Carcinoma of Head and Neck/immunology
- Squamous Cell Carcinoma of Head and Neck/metabolism
- Squamous Cell Carcinoma of Head and Neck/pathology
- Squamous Cell Carcinoma of Head and Neck/therapy
- T-Lymphocytes, Regulatory/drug effects
- T-Lymphocytes, Regulatory/immunology
- T-Lymphocytes, Regulatory/metabolism
- Tumor Burden
- Tumor Microenvironment
- Tumor Necrosis Factor Receptor Superfamily, Member 9/antagonists & inhibitors
- Tumor Necrosis Factor Receptor Superfamily, Member 9/metabolism
- Mice
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Affiliation(s)
- Michael W Knitz
- Department of Radiation Oncology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Thomas E Bickett
- Department of Radiation Oncology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Laurel B Darragh
- Department of Radiation Oncology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Ayman J Oweida
- Département de médecine nucléaire et radiobiologie, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Shilpa Bhatia
- Department of Radiation Oncology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Benjamin Van Court
- Department of Radiation Oncology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Shiv Bhuvane
- Department of Radiation Oncology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Miles Piper
- Department of Radiation Oncology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Jacob Gadwa
- Department of Radiation Oncology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Adam C Mueller
- Department of Radiation Oncology, Thomas Jefferson University, Philadelphia, Pennsylvania, USA
| | - Diemmy Nguyen
- Department of Radiation Oncology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Varuna Nangia
- Department of Radiation Oncology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Douglas G Osborne
- Department of Dermatology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Xiyuan Bai
- Department of Academic Affairs, National Jewish Health, Denver, Colorado, USA
| | - Sarah E Ferrara
- University of Colorado Comprehensive Cancer Center, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Mary-Keara Boss
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado, USA
| | - Andrew Goodspeed
- University of Colorado Comprehensive Cancer Center, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Matthew A Burchill
- Division of Gastroenterology & Hepatology, Department of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Beth A Jirón Tamburini
- Division of Gastroenterology & Hepatology, Department of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Edward D Chan
- Department of Academic Affairs, National Jewish Health, Denver, Colorado, USA
| | - Curtis R Pickering
- Department of Head and Neck Surgery, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Eric T Clambey
- Department of Anesthesiology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
| | - Sana D Karam
- Department of Radiation Oncology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
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8
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Gadwa J, Bickett TE, Darragh LB, Knitz MW, Bhatia S, Piper M, Van Court B, Bhuvane S, Nguyen D, Nangia V, Kleczko EK, Nemenoff RA, Karam SD. Complement C3a and C5a receptor blockade modulates regulatory T cell conversion in head and neck cancer. J Immunother Cancer 2021; 9:e002585. [PMID: 33789881 PMCID: PMC8016081 DOI: 10.1136/jitc-2021-002585] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/09/2021] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Resistance to therapy is a major problem in treating head and neck squamous cell carcinomas (HNSCC). Complement system inhibition has been shown to reduce tumor growth, metastasis, and therapeutic resistance in other tumor models, but has yet to be explored in the context of HNSCC. Here, we tested the effects of complement inhibition and its therapeutic potential in HNSCC. METHODS We conducted our studies using two Human Papilloma Virus (HPV)-negative HNSCC orthotopic mouse models. Complement C3aR and C5aR1 receptor antagonists were paired with radiation therapy (RT). Tumor growth was measured and immune populations from tumor, lymph node, and peripheral blood were compared among various treatment groups. Genetically engineered mouse models DEREG and C3-/- were used in addition to standard wild type models. Flow cytometry, clinical gene sets, and in vitro assays were used to evaluate the role complement receptor blockade has on the immunological makeup of the tumor microenvironment. RESULTS In contrast to established literature, inhibition of complement C3a and C5a signaling using receptor antagonists accelerated tumor growth in multiple HNSCC cell lines and corresponded with increased frequency of regulatory T cell (Treg) populations. Local C3a and C5a signaling has importance for CD4 T cell homeostasis and eventual development into effector phenotypes. Interruption of this signaling axis drives a phenotypic conversion of CD4+ T cells into Tregs, characterized by enhanced expression of Foxp3. Depletion of Tregs reversed tumor growth, and combination of Treg depletion and C3a and C5a receptor inhibition decreased tumor growth below that of the control groups. Complete knockout of C3 does not harbor the expected effect on tumor growth, indicating a still undetermined compensatory mechanism. Dexamethasone is frequently prescribed to patients undergoing RT and inhibits complement activation. We report no deleterious effects associated with dexamethasone due to complement inhibition. CONCLUSIONS Our data establish Tregs as a pro-tumorigenic driver during complement inhibition and provide evidence that targeted C3a and C5a receptor inhibition may add therapeutic advantage when coupled with anti-Treg therapy.
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MESH Headings
- Animals
- Cell Line, Tumor
- Cell Proliferation/drug effects
- Complement C3/genetics
- Complement C3/metabolism
- Complement Inactivating Agents/toxicity
- Dexamethasone/toxicity
- Forkhead Transcription Factors/metabolism
- Head and Neck Neoplasms/genetics
- Head and Neck Neoplasms/immunology
- Head and Neck Neoplasms/metabolism
- Head and Neck Neoplasms/pathology
- Humans
- Lymphocytes, Tumor-Infiltrating/drug effects
- Lymphocytes, Tumor-Infiltrating/immunology
- Lymphocytes, Tumor-Infiltrating/metabolism
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Mice, Knockout
- Receptor, Anaphylatoxin C5a/antagonists & inhibitors
- Receptor, Anaphylatoxin C5a/metabolism
- Receptors, Complement/antagonists & inhibitors
- Receptors, Complement/metabolism
- Signal Transduction
- Squamous Cell Carcinoma of Head and Neck/genetics
- Squamous Cell Carcinoma of Head and Neck/immunology
- Squamous Cell Carcinoma of Head and Neck/metabolism
- Squamous Cell Carcinoma of Head and Neck/pathology
- T-Lymphocytes, Regulatory/drug effects
- T-Lymphocytes, Regulatory/immunology
- T-Lymphocytes, Regulatory/metabolism
- Time Factors
- Tumor Burden/drug effects
- Mice
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Affiliation(s)
- Jacob Gadwa
- Radiation Oncology, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Thomas E Bickett
- Radiation Oncology, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Laurel B Darragh
- Radiation Oncology, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Michael William Knitz
- Radiation Oncology, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Shilpa Bhatia
- Radiation Oncology, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Miles Piper
- Radiation Oncology, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Benjamin Van Court
- Radiation Oncology, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Shiv Bhuvane
- Radiation Oncology, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Diemmy Nguyen
- Radiation Oncology, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Varuna Nangia
- Radiation Oncology, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Emily K Kleczko
- Medicine, University of Colorado Denver-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Raphael A Nemenoff
- Medicine, University of Colorado Denver-Anschutz Medical Campus, Aurora, Colorado, USA
| | - Sana D Karam
- Radiation Oncology, University of Colorado-Anschutz Medical Campus, Aurora, Colorado, USA
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9
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Chawla D, Olet S, Mortada ME, Zilinski J, Ammar KA, Nangia V, Bhatia A, Niazi I, Sra J, Tajik AJ, Jahangir A. P5658Incorporation of severity of left atrial enlargement in clinical risk factors improves identification of patients at risk for development of atrial fibrillation. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Early identification of patients at risk for atrial fibrillation (AF) is desirable to prevent its development and complications. Clinical predictors have been recognized but need refinement to improve predictability. We evaluated whether severity of left atrial enlargement (LAE) added to a scoring system (CHA2DS2VASC) in an unselected non-AF population improves risk stratification for incident AF.
Purpose
To assess the incremental benefit of LAE severity added to CHA2DS2VASc in predicting future AF in non-AF patients.
Methods
From 2012–2017, consecutive adult patients with an echocardiogram and no prior AF were identified. CHA2DS2VASc was used to define baseline AF risk, and the incremental risk of AF with addition of LAE was assessed through increased LA volume index (LAVI; moderate 42–48 ml/m2, severe >48 ml/m2). To quantify improvement in risk prediction, logistic regression model was fitted and odds ratios (OR) and ROC curves obtained.
Results
Out of 155,597 patients with no prior AF, 13.8% developed AF over 1.5±1.3 years. OR for AF with CHA2DS2VASc was 1.68 (95% CI 1.66–1.69). With addition of moderately or severely increased LAVI to the model, OR for AF increased to 2.3 (2.2–2.5) and 3.8 (3.6–4.0), respectively. ROC analysis showed c-statistics of 0.66 with CHA2DS2VASc, 0.63 with LAVI, and 0.71 with incorporation of both (Fig).
AF CHAD score
Conclusion(s)
In non-AF patients, predictability for future AF can be improved by using clinical factors (CHA2DS2VASc) and increased LAVI. This information may guide closer monitoring and initiation of therapies to prevent progression to AF or stroke.
Acknowledgement/Funding
None
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Affiliation(s)
- D Chawla
- Aurora Sinai Aurora St. Luke's Medical Centers, Milwaukee, United States of America
| | - S Olet
- Aurora Sinai Aurora St. Luke's Medical Centers, Milwaukee, United States of America
| | - M E Mortada
- Aurora Sinai Aurora St. Luke's Medical Centers, Milwaukee, United States of America
| | - J Zilinski
- Aurora Sinai Aurora St. Luke's Medical Centers, Milwaukee, United States of America
| | - K A Ammar
- Aurora Sinai Aurora St. Luke's Medical Centers, Milwaukee, United States of America
| | - V Nangia
- Aurora Sinai Aurora St. Luke's Medical Centers, Milwaukee, United States of America
| | - A Bhatia
- Aurora Sinai Aurora St. Luke's Medical Centers, Milwaukee, United States of America
| | - I Niazi
- Aurora Sinai Aurora St. Luke's Medical Centers, Milwaukee, United States of America
| | - J Sra
- Aurora Sinai Aurora St. Luke's Medical Centers, Milwaukee, United States of America
| | - A J Tajik
- Aurora Sinai Aurora St. Luke's Medical Centers, Milwaukee, United States of America
| | - A Jahangir
- Aurora Sinai Aurora St. Luke's Medical Centers, Milwaukee, United States of America
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10
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Raoof S, Mulford IJ, Frisco-Cabanos H, Nangia V, Timonina D, Labrot E, Hafeez N, Bilton SJ, Drier Y, Ji F, Greenberg M, Williams A, Kattermann K, Damon L, Sovath S, Rakiec DP, Korn JM, Ruddy DA, Benes CH, Hammerman PS, Piotrowska Z, Sequist LV, Niederst MJ, Barretina J, Engelman JA, Hata AN. Targeting FGFR overcomes EMT-mediated resistance in EGFR mutant non-small cell lung cancer. Oncogene 2019; 38:6399-6413. [PMID: 31324888 PMCID: PMC6742540 DOI: 10.1038/s41388-019-0887-2] [Citation(s) in RCA: 132] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 03/20/2019] [Accepted: 05/04/2019] [Indexed: 12/15/2022]
Abstract
Evolved resistance to tyrosine kinase inhibitor (TKI) targeted therapies
remains a major clinical challenge. In EGFR mutant non-small
cell lung cancer (NSCLC), failure of EGFR TKIs can result from both genetic and
epigenetic mechanisms of acquired drug resistance. Widespread reports of
histologic and gene expression changes consistent with an
epithelial-to-mesenchymal transition (EMT) have been associated with initially
surviving drug tolerant persister cells, which can seed bona
fide genetic mechanisms of resistance to EGFR TKIs. While
therapeutic approaches targeting fully resistant cells, such as those harboring
an EGFRT790M mutation, have been developed, a clinical strategy for
preventing the emergence of persister cells remains elusive. Using mesenchymal
cell lines derived from biopsies of patients who progressed on EGFR TKI as
surrogates for persister populations, we performed whole-genome CRISPR screening
and identified FGFR1 as the top target promoting survival of mesenchymal EGFR
mutant cancers. Although numerous previous reports of FGFR signaling
contributing to EGFR TKI resistance in vitro exist, the data has not yet been
sufficiently compelling to instigate a clinical trial testing this hypothesis,
nor has the role of FGFR in promoting the survival of persister cells been
elucidated. In this study, we find that combining EGFR and FGFR inhibitors
inhibited the survival and expansion of EGFR mutant drug
tolerant cells over long time periods, preventing the development of fully
resistant cancers in multiple vitro models and in vivo. These results suggest
that dual EGFR and FGFR blockade may be a promising clinical strategy for both
preventing and overcoming EMT-associated acquired drug resistance and provide
motivation for clinical study of combined EGFR and FGFR inhibition in
EGFR-mutated NSCLCs.
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Affiliation(s)
- Sana Raoof
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA
| | - Iain J Mulford
- Oncology Disease Area, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | | | - Varuna Nangia
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA
| | - Daria Timonina
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA
| | - Emma Labrot
- Oncology Disease Area, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - Nafeeza Hafeez
- Oncology Disease Area, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - Samantha J Bilton
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA
| | - Yotam Drier
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA
| | - Fei Ji
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA
| | - Max Greenberg
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA
| | - August Williams
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA
| | | | - Leah Damon
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA
| | - Sosathya Sovath
- Oncology Disease Area, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - Daniel P Rakiec
- Oncology Disease Area, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - Joshua M Korn
- Oncology Disease Area, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - David A Ruddy
- Oncology Disease Area, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - Cyril H Benes
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA.,Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Peter S Hammerman
- Oncology Disease Area, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - Zofia Piotrowska
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA.,Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Lecia V Sequist
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA.,Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Matthew J Niederst
- Oncology Disease Area, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - Jordi Barretina
- Oncology Disease Area, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - Jeffrey A Engelman
- Oncology Disease Area, Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - Aaron N Hata
- Massachusetts General Hospital (MGH) Cancer Center, Charlestown, MA, USA. .,Department of Medicine, Harvard Medical School, Boston, MA, USA.
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11
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Li C, Oh A, Nangia V, Hata AN. Abstract 2049: LKB1 regulates BH3-mimetics vulnerability of KRAS mutant non-small cell lung cancer by alternating mitochondrial apoptotic protein interactions. Cancer Res 2019. [DOI: 10.1158/1538-7445.am2019-2049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Over 30% of lung adenocarcinomas harbor KRAS mutation. Despite progress in targeted therapies for specific genetic subsets of lung cancer (e.g. EGFR or ALK), there are no clinically effective targeted therapies for KRAS non-small cell lung cancer (NSCLC). Interpatient heterogeneity of KRAS mutant lung cancers, with large variability in co-occurring mutations, may contribute to its refractory phenotype. Specifically, KRAS mutant lung cancers with concurrent loss of the tumor suppressor LKB1 (KRAS-LKB1) have increased metastatic frequency and resistance to chemotherapy in pre-clinical models, and these patients have poor responses to immune checkpoint inhibitor. Thus, there is a critical need to develop novel therapeutic approaches for this subset of NSCLC. Intrinsic resistance to apoptosis limits the efficacy of therapies targeting KRAS signaling. Previous studies reported BCL-2/BCL-XL + MEK inhibition can increase apoptotic responses of some KRAS mutant cancers. Recently, potent and selective inhibitors of MCL-1 have been developed, creating additional possibilities for targeting apoptotic machinery for cancers that dependent upon MCL-1 for survival.
We recently reported that novel MCL-1 inhibitor AMG-176 combined with MEK inhibitor trametinib can induce tumor regression in subsets of KRAS mutant NSCLC pre-clinical tumor models. In addition to commercially available cell lines, we established 20 patient-derived cell line/xenograft mouse model and showed that KRAS-LKB1 cell lines are particularly sensitive to MEK + MCL1 inhibition with high synergy score. Moreover, restoring LKB1 expression in LKB1-/- cell lines hampers the synergy and blocks mitochondrial depolarization and apoptosis. BH3-profiling reveals high dependency on MCL-1 in KRAS-LKB1 cell lines. We reported that trametinib increase intercellular Bim (pro-apoptotic protein) and subsequent loading of Bim onto pro-survival proteins BCL-XL and/or MCL1. MCL1 inhibitor releases Bim from MCL1 and initiates the apoptotic cascade. Interestingly, trametinib induces preferential sequestration of Bim by MCL-1 in KRAS-LKB1 models. Restoration of LKB1 in LKB1-/- cell lines reduces the trametinib-induced Bim:MCL-1 protein-protein interactions. Combined inhibition of MEK + MCL1 caused dramatic tumor regression in LKB1-deficient xenograft mouse models compared to LKB1-restored models.
Our results reveal fundamental insights into a novel role for LKB1 in the regulation of mitochondrial apoptosis and will lay a solid pre-clinical foundation for the clinical investigation of the MEK + MCL-1 inhibitor combination. Our data may also support using LKB1 as a genetic biomarker for guiding the selection of BH3 mimetics in targeting KRAS mutant NSCLC.
Citation Format: Chendi Li, Audris Oh, Varuna Nangia, Aaron N. Hata. LKB1 regulates BH3-mimetics vulnerability of KRAS mutant non-small cell lung cancer by alternating mitochondrial apoptotic protein interactions [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2019; 2019 Mar 29-Apr 3; Atlanta, GA. Philadelphia (PA): AACR; Cancer Res 2019;79(13 Suppl):Abstract nr 2049.
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Affiliation(s)
- Chendi Li
- Massachusetts General Hospital, Charlestown, MA
| | - Audris Oh
- Massachusetts General Hospital, Charlestown, MA
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12
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Piotrowska Z, Isozaki H, Lennerz JK, Gainor JF, Lennes IT, Zhu VW, Marcoux N, Banwait MK, Digumarthy SR, Su W, Yoda S, Riley AK, Nangia V, Lin JJ, Nagy RJ, Lanman RB, Dias-Santagata D, Mino-Kenudson M, Iafrate AJ, Heist RS, Shaw AT, Evans EK, Clifford C, Ou SHI, Wolf B, Hata AN, Sequist LV. Landscape of Acquired Resistance to Osimertinib in EGFR-Mutant NSCLC and Clinical Validation of Combined EGFR and RET Inhibition with Osimertinib and BLU-667 for Acquired RET Fusion. Cancer Discov 2018; 8:1529-1539. [PMID: 30257958 PMCID: PMC6279502 DOI: 10.1158/2159-8290.cd-18-1022] [Citation(s) in RCA: 307] [Impact Index Per Article: 51.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 09/21/2018] [Accepted: 09/24/2018] [Indexed: 12/12/2022]
Abstract
We present a cohort of 41 patients with osimertinib resistance biopsies, including 2 with an acquired CCDC6-RET fusion. Although RET fusions have been identified in resistant EGFR-mutant non-small cell lung cancer (NSCLC), their role in acquired resistance to EGFR inhibitors is not well described. To assess the biological implications of RET fusions in an EGFR-mutant cancer, we expressed CCDC6-RET in PC9 (EGFR del19) and MGH134 (EGFR L858R/T790M) cells and found that CCDC6-RET was sufficient to confer resistance to EGFR tyrosine kinase inhibitors (TKI). The selective RET inhibitors BLU-667 and cabozantinib resensitized CCDC6-RET-expressing cells to EGFR inhibition. Finally, we treated 2 patients with EGFR-mutant NSCLC and RET-mediated resistance with osimertinib and BLU-667. The combination was well tolerated and led to rapid radiographic response in both patients. This study provides proof of concept that RET fusions can mediate acquired resistance to EGFR TKIs and that combined EGFR and RET inhibition with osimertinib/BLU-667 may be a well-tolerated and effective treatment strategy for such patients. SIGNIFICANCE: The role of RET fusions in resistant EGFR-mutant cancers is unknown. We report that RET fusions mediate resistance to EGFR inhibitors and demonstrate that this bypass track can be effectively targeted with a selective RET inhibitor (BLU-667) in the clinic.This article is highlighted in the In This Issue feature, p. 1494.
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Affiliation(s)
- Zofia Piotrowska
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | - Hideko Isozaki
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | - Jochen K Lennerz
- Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts
| | - Justin F Gainor
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | - Inga T Lennes
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | - Viola W Zhu
- Chao Family Comprehensive Cancer Center, University of California Irvine School of Medicine, Orange, California
| | - Nicolas Marcoux
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | | | - Subba R Digumarthy
- Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts
| | - Wenjia Su
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | - Satoshi Yoda
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | - Amanda K Riley
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | - Varuna Nangia
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | - Jessica J Lin
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | | | | | - Dora Dias-Santagata
- Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts
| | - Mari Mino-Kenudson
- Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts
| | - A John Iafrate
- Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts
| | - Rebecca S Heist
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | - Alice T Shaw
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | | | | | - Sai-Hong I Ou
- Chao Family Comprehensive Cancer Center, University of California Irvine School of Medicine, Orange, California
| | - Beni Wolf
- Blueprint Medicines, Cambridge, Massachusetts
| | - Aaron N Hata
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.
| | - Lecia V Sequist
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.
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13
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Misale S, Fatherree JP, Cortez E, Li C, Bilton S, Timonina D, Myers DT, Lee D, Gomez-Caraballo M, Greenberg M, Nangia V, Greninger P, Egan RK, McClanaghan J, Stein GT, Murchie E, Zarrinkar PP, Janes MR, Li LS, Liu Y, Hata AN, Benes CH. KRAS G12C NSCLC Models Are Sensitive to Direct Targeting of KRAS in Combination with PI3K Inhibition. Clin Cancer Res 2018; 25:796-807. [PMID: 30327306 DOI: 10.1158/1078-0432.ccr-18-0368] [Citation(s) in RCA: 155] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 07/23/2018] [Accepted: 10/11/2018] [Indexed: 12/16/2022]
Abstract
PURPOSE KRAS-mutant lung cancers have been recalcitrant to treatments including those targeting the MAPK pathway. Covalent inhibitors of KRAS p.G12C allele allow for direct and specific inhibition of mutant KRAS in cancer cells. However, as for other targeted therapies, the therapeutic potential of these inhibitors can be impaired by intrinsic resistance mechanisms. Therefore, combination strategies are likely needed to improve efficacy.Experimental Design: To identify strategies to maximally leverage direct KRAS inhibition we defined the response of a panel of NSCLC models bearing the KRAS G12C-activating mutation in vitro and in vivo. We used a second-generation KRAS G12C inhibitor, ARS1620 with improved bioavailability over the first generation. We analyzed KRAS downstream effectors signaling to identify mechanisms underlying differential response. To identify candidate combination strategies, we performed a high-throughput drug screening across 112 drugs in combination with ARS1620. We validated the top hits in vitro and in vivo including patient-derived xenograft models. RESULTS Response to direct KRAS G12C inhibition was heterogeneous across models. Adaptive resistance mechanisms involving reactivation of MAPK pathway and failure to induce PI3K-AKT pathway inactivation were identified as likely resistance events. We identified several model-specific effective combinations as well as a broad-sensitizing effect of PI3K-AKT-mTOR pathway inhibitors. The G12Ci+PI3Ki combination was effective in vitro and in vivo on models resistant to single-agent ARS1620 including patient-derived xenografts models. CONCLUSIONS Our findings suggest that signaling adaptation can in some instances limit the efficacy of ARS1620 but combination with PI3K inhibitors can overcome this resistance.
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Affiliation(s)
- Sandra Misale
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Jackson P Fatherree
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Eliane Cortez
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Chendi Li
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Samantha Bilton
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Daria Timonina
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - David T Myers
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Dana Lee
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Maria Gomez-Caraballo
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Max Greenberg
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Varuna Nangia
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Patricia Greninger
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Regina K Egan
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Joseph McClanaghan
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Giovanna T Stein
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Ellen Murchie
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | | | | | | | - Yi Liu
- Wellspring Biosciences, Inc., San Diego, California.,Kura Oncology, Inc., San Diego, California
| | - Aaron N Hata
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts. .,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Cyril H Benes
- Massachusetts General Hospital Cancer Center, Boston, Massachusetts. .,Department of Medicine, Harvard Medical School, Boston, Massachusetts
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14
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Nangia V, Siddiqui FM, Caenepeel S, Timonina D, Bilton SJ, Phan N, Gomez-Caraballo M, Archibald HL, Li C, Fraser C, Rigas D, Vajda K, Ferris LA, Lanuti M, Wright CD, Raskin KA, Cahill DP, Shin JH, Keyes C, Sequist LV, Piotrowska Z, Farago AF, Azzoli CG, Gainor JF, Sarosiek KA, Brown SP, Coxon A, Benes CH, Hughes PE, Hata AN. Exploiting MCL1 Dependency with Combination MEK + MCL1 Inhibitors Leads to Induction of Apoptosis and Tumor Regression in KRAS-Mutant Non-Small Cell Lung Cancer. Cancer Discov 2018; 8:1598-1613. [PMID: 30254092 DOI: 10.1158/2159-8290.cd-18-0277] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 08/30/2018] [Accepted: 09/24/2018] [Indexed: 12/12/2022]
Abstract
BH3 mimetic drugs, which inhibit prosurvival BCL2 family proteins, have limited single-agent activity in solid tumor models. The potential of BH3 mimetics for these cancers may depend on their ability to potentiate the apoptotic response to chemotherapy and targeted therapies. Using a novel class of potent and selective MCL1 inhibitors, we demonstrate that concurrent MEK + MCL1 inhibition induces apoptosis and tumor regression in KRAS-mutant non-small cell lung cancer (NSCLC) models, which respond poorly to MEK inhibition alone. Susceptibility to BH3 mimetics that target either MCL1 or BCL-xL was determined by the differential binding of proapoptotic BCL2 proteins to MCL1 or BCL-xL, respectively. The efficacy of dual MEK + MCL1 blockade was augmented by prior transient exposure to BCL-xL inhibitors, which promotes the binding of proapoptotic BCL2 proteins to MCL1. This suggests a novel strategy for integrating BH3 mimetics that target different BCL2 family proteins for KRAS-mutant NSCLC. SIGNIFICANCE: Defining the molecular basis for MCL1 versus BCL-xL dependency will be essential for effective prioritization of BH3 mimetic combination therapies in the clinic. We discover a novel strategy for integrating BCL-xL and MCL1 inhibitors to drive and subsequently exploit apoptotic dependencies of KRAS-mutant NSCLCs treated with MEK inhibitors.See related commentary by Leber et al., p. 1511.This article is highlighted in the In This Issue feature, p. 1494.
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Affiliation(s)
- Varuna Nangia
- Massachusetts General Hospital Cancer Center, Charlestown, Massachusetts
| | - Faria M Siddiqui
- Massachusetts General Hospital Cancer Center, Charlestown, Massachusetts
| | - Sean Caenepeel
- Department of Oncology Research, Amgen, Thousand Oaks, California
| | - Daria Timonina
- Massachusetts General Hospital Cancer Center, Charlestown, Massachusetts
| | - Samantha J Bilton
- Massachusetts General Hospital Cancer Center, Charlestown, Massachusetts
| | - Nicole Phan
- Massachusetts General Hospital Cancer Center, Charlestown, Massachusetts
| | | | - Hannah L Archibald
- Massachusetts General Hospital Cancer Center, Charlestown, Massachusetts
| | - Chendi Li
- Massachusetts General Hospital Cancer Center, Charlestown, Massachusetts
| | - Cameron Fraser
- Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, Massachusetts
| | - Diamanda Rigas
- Department of Oncology Research, Amgen, Thousand Oaks, California
| | - Kristof Vajda
- Massachusetts General Hospital Cancer Center, Charlestown, Massachusetts
| | - Lorin A Ferris
- Massachusetts General Hospital Cancer Center, Charlestown, Massachusetts
| | - Michael Lanuti
- Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts
| | - Cameron D Wright
- Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts
| | - Kevin A Raskin
- Department of Orthopaedics, Massachusetts General Hospital, Boston, Massachusetts
| | - Daniel P Cahill
- Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts
| | - John H Shin
- Department of Neurosurgery, Massachusetts General Hospital, Boston, Massachusetts
| | - Colleen Keyes
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts
| | - Lecia V Sequist
- Division of Hematology Oncology, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Zofia Piotrowska
- Division of Hematology Oncology, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Anna F Farago
- Division of Hematology Oncology, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Christopher G Azzoli
- Division of Hematology Oncology, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Justin F Gainor
- Division of Hematology Oncology, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Kristopher A Sarosiek
- Department of Environmental Health, Harvard T. H. Chan School of Public Health, Boston, Massachusetts
| | - Sean P Brown
- Department of Medicinal Chemistry, Amgen, Thousand Oaks, California
| | - Angela Coxon
- Department of Oncology Research, Amgen, Thousand Oaks, California
| | - Cyril H Benes
- Massachusetts General Hospital Cancer Center, Charlestown, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Paul E Hughes
- Department of Oncology Research, Amgen, Thousand Oaks, California
| | - Aaron N Hata
- Massachusetts General Hospital Cancer Center, Charlestown, Massachusetts. .,Division of Hematology Oncology, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts.,Department of Medicine, Harvard Medical School, Boston, Massachusetts
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15
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Hata AN, Siddiqui FM, Gomez-Caraballo M, Bilton SJ, Timonina D, Nangia V, Coxon A, Caenepeel S, Hughes P. Abstract 2163: Combined targeting of MEK and MCL-1 induces apoptosis and tumor regression of KRAS mutant NSCLC. Cancer Res 2017. [DOI: 10.1158/1538-7445.am2017-2163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
There are currently no effective targeted therapeutic strategies for KRAS mutant non-small cell lung cancer (NSCLC). Single agent MEK inhibitors have demonstrated showed disappointing clinical activity, partly due to inability to induce a robust apoptotic response. Combining MEK inhibitors with BCL-XL/BCL-2 inhibitors may be effective for a subset of KRAS mutant cancers that are dependent on BCL-XL for survival, however this combination is unlikely to be an effective strategy for cancers dependent on MCL-1. We investigated the effect of combining the MEK inhibitor trametinib with a novel MCL-1 inhibitor (compound A), which possesses potent and selective anti-MCL-1 activity in vitro and in vivo, on KRAS mutant cancers. In contrast to colorectal cancer models, which are largely sensitive to combined MEK + BCL-XL inhibition, a subset of cell line and patient-derived mouse xenograft (PDX) KRAS mutant NSCLC models were significantly more sensitive to MEK + MCL-1 inhibition compared to MEK + BCL-XL. To model potential clinical strategies, we tested intermittent dosing regimens and unexpectedly discovered a method strategy for dramatically sensitizing KRAS mutant NSCLC cells to the MEK + MCL-1 combination. These studies provide rationale for the clinical evaluation of combined MEK + MCL-1 inhibitors for KRAS mutant NSCLC.
Citation Format: Aaron N. Hata, Faria M. Siddiqui, Maria Gomez-Caraballo, Samantha J. Bilton, Daria Timonina, Varuna Nangia, Angela Coxon, Sean Caenepeel, Paul Hughes. Combined targeting of MEK and MCL-1 induces apoptosis and tumor regression of KRAS mutant NSCLC [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 2163. doi:10.1158/1538-7445.AM2017-2163
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16
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Nangia V, Sunohara MD, Topp E, Gregorich EG, Drury CF, Gottschall N, Lapen DR. Measuring and modeling the effects of drainage water management on soil greenhouse gas fluxes from corn and soybean fields. J Environ Manage 2013; 129:652-64. [PMID: 23910796 DOI: 10.1016/j.jenvman.2013.05.040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 04/30/2013] [Accepted: 05/17/2013] [Indexed: 06/02/2023]
Abstract
Controlled tile drainage can boost crop yields and improve water quality, but it also has the potential to increase GHG emissions. This study compared in-situ chamber-based measures of soil CH4, N2O, and CO2 fluxes for silt loam soil under corn and soybean cropping with conventional tile drainage (UTD) and controlled tile drainage (CTD). A semi-empirical model (NEMIS-NOE) was also used to predict soil N2O fluxes from soils using observed soil data. Observed N2O and CH4 fluxes between UTD and CTD fields during the farming season were not significantly different at 0.05 level. Soils were primarily a sink for CH4 but in some cases a source (sources were associated exclusively with CTD). The average N2O fluxes measured ranged between 0.003 and 0.028 kg N ha(-1) day(-1). There were some significantly higher (p ≤ 0.05) CO2 fluxes associated with CTD relative to UTD during some years of study. Correlation analyses indicated that the shallower the water table, the greater the CO2 fluxes. Higher corn plant C for CTD tended to offset estimated higher CTD CO2 C losses via soil respiration by ∼100-300 kg C ha(-1). There were good fits between observed and predicted (NEMIS-NOE) N2O fluxes for corn (R(2) = 0.70) and soybean (R(2) = 0.53). Predicted N2O fluxes were higher for CTD for approximately 70% of the paired-field study periods suggesting that soil physical factors, such as water-filled pore space, imposed by CTD have potentially strong impacts on net N fluxes. Model predictions of daily cumulative N2O fluxes for the agronomically-active study period for corn-CTD and corn-UTD, as a percentage of total N fertilizer applied, were 3.1% and 2.6%, respectively. For predicted N2O fluxes on basis of yield units, indices were 0.0005 and 0.0004 (kg N kg(-1) crop grain yield) for CTD and UTD corn fields, respectively, and 0.0011 and 0.0005 for CTD and UTD soybean fields, respectively.
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Affiliation(s)
- V Nangia
- Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, Ontario, Canada K1A 0C6; International Centre for Agricultural Research in the Dry Areas (ICARDA), Aleppo, Syrian Arab Republic
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17
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Nangia V, Mulla DJ, Gowda PH. Precipitation changes impact stream discharge, nitrate-nitrogen load more than agricultural management changes. J Environ Qual 2010; 39:2063-2071. [PMID: 21284304 DOI: 10.2134/jeq2010.0105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Nitrate-N losses to surface waters in the Upper Midwest of the Untied States have increased in recent decades, contributing to hypoxia in the Gulf of Mexico. This paper investigates whether increasing nitrate-N export from cropland in the Upper Midwest since the late 1960s results from changes in land use or climate. The Agricultural Drainage and Pesticide Transport (ADAPT) Model simulated current and historical agricultural systems under past and recent wet climate for Seven Mile Creek in Minnesota. Simulations were run with management and climate for three distinctly different periods--namely, 1965 to 1969, 1976 to 1980, and 1999 to 2003 (wettest period). Results showed discharge and nitrate-N losses responded more to changes in climate than management. The wetter period (1999-2003) caused a simulated 70% increase in discharge under 1960s-era management compared with that period's observed climate and a simulated 51% increase in discharge under 1970s-era management compared with the 1976 to 1980 climate. The recent, wetter climate also produced a 62% increase in nitrate-N losses for 1960s-era management compared with the actual climate and a 137% increase in nitrate-N losses for 1978 management conditions compared with actual 1970s climate. Had recent climate been in place and stable since 1965, agricultural changes would have decreased discharge by 6.4% through the late 1970s and then by another 21.1% under modern management but would have increased nitrate-N losses by 184% through the late 1970s and then decreased nitrate-N losses by 13.5% between 1978 and 2001. Management changes that were important drivers included increasing N-fertilizer rates, increases in corn acreage, and increases in crop yield. But the most important factor driving increased nitrate-N losses from agriculture since the 1970s was an increasingly wetter climate.
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Affiliation(s)
- V Nangia
- Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, Ottawa, ON, Canada K1A 0C6.
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18
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Nangia V, Gowda PH, Mulla DJ, Sands GR. Water quality modeling of fertilizer management impacts on nitrate losses in tile drains at the field scale. J Environ Qual 2008; 37:296-307. [PMID: 18268291 DOI: 10.2134/jeq2007.0224] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2007] [Indexed: 05/11/2023]
Abstract
Nitrate losses from subsurface tile drained row cropland in the Upper Midwest U.S. contribute to hypoxia in the Gulf of Mexico. Strategies are needed to reduce nitrate losses to the Mississippi River. This paper evaluates the effect of fertilizer rate and timing on nitrate losses in two (East and West) commercial row crop fields located in south-central Minnesota. The Agricultural Drainage and Pesticide Transport (ADAPT) model was calibrated and validated for monthly subsurface tile drain flow and nitrate losses for a period of 1999-2003. Good agreement was found between observed and predicted tile drain flow and nitrate losses during the calibration period, with Nash-Sutcliffe modeling efficiencies of 0.75 and 0.56, respectively. Better agreements were observed for the validation period. The calibrated model was then used to evaluate the effects of rate and timing of fertilizer application on nitrate losses with a 50-yr climatic record (1954-2003). Significant reductions in nitrate losses were predicted by reducing fertilizer application rates and changing timing. A 13% reduction in nitrate losses was predicted when fall fertilizer application rate was reduced from 180 to 123 kg/ha. A further 9% reduction in nitrate losses can be achieved when switching from fall to spring application. Larger reductions in nitrate losses would require changes in fertilizer rate and timing, as well as other practices such as changing tile drain spacings and/or depths, fall cover cropping, or conversion of crop land to pasture.
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Affiliation(s)
- V Nangia
- International Water Management Inst, Colombo, Sri Lanka.
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19
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Jonas J, Nangia V, Matin A, Bhojwani K, Kulkarni M, Yadav M, Nawroth P. Prävalenz von Diabetes mellitus im ländlichen Zentralindien. Die Central India Eye and Medical Study. DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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20
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Jonas J, Nangia V, Matin A, Bhojwani K, Kulkarni M, Yadav M, Nawroth P. Häufigkeit von nicht-diagnostiziertem Diabetes mellitus im ländlichen Zentralindien. Die Central India Eye and Medical Study. DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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21
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Lang PJ, Bradley MM, Fitzsimmons JR, Cuthbert BN, Scott JD, Moulder B, Nangia V. Emotional arousal and activation of the visual cortex: an fMRI analysis. Psychophysiology 1998; 35:199-210. [PMID: 9529946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Functional activity in the visual cortex was assessed using functional magnetic resonance imaging technology while participants viewed a series of pleasant, neutral, or unpleasant pictures. Coronal images at four different locations in the occipital cortex were acquired during each of eight 12-s picture presentation periods (on) and 12-s interpicture interval (off). The extent of functional activation was larger in the right than the left hemisphere and larger in the occipital than in the occipitoparietal regions during processing of all picture contents compared with the interpicture intervals. More importantly, functional activity was significantly greater in all sampled brain regions when processing emotional (pleasant or unpleasant) pictures than when processing neutral stimuli. In Experiment 2, a hypothesis that these differences were an artifact of differential eye movements was ruled out. Whereas both emotional and neutral pictures produced activity centered on the calcarine fissure (Area 17), only emotional pictures also produced sizable clusters bilaterally in the occipital gyrus, in the right fusiform gyrus, and in the right inferior and superior parietal lobules.
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Affiliation(s)
- P J Lang
- University of Florida, Gainesville 32610, USA
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22
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Abstract
AIMS The laser Doppler technique was used to compare the capillary blood speed measured at localised sites of the optic nerve head in stable, untreated ocular hypertensive patients with that measured in healthy normal subjects. The stereophotogrammetric technique was also used to measure the retinal nerve fibre layer thickness at the disc margin in the eyes of the patients. METHODS Doppler broadening measurements were made at superior and inferior temporal disc sites in 18 eyes of 10 ocular hypertensive patients and in 12 eyes of seven age and sex-matched normal subjects. RESULTS On average, Doppler broadening and, hence, capillary blood speed were significantly higher (p = 0.018) in the patients than in the normal subjects. The largest values of Doppler broadening in the patients were measured at sites adjacent to the thinnest retinal nerve fibre layer. Linear regression analysis showed a significant inverse relation (p = 0.0004) between Doppler broadening and nerve fibre layer thickness in left eyes, and a nearly significant relation (p = 0.06) in right eyes. At temporal sites of the optic nerve head there is a compensatory relation between a thinning nerve fibre layer and a locally increasing blood supply to the optic nerve head. CONCLUSION Together with previous observations of fluorescein filling defects in similar patients, these results indicate that there is spatial heterogeneity of blood flow in the optic nerve head in stable, untreated ocular hypertensive patients.
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Affiliation(s)
- G T Feke
- Schepens Eye Research Institute, Boston, MA 02114, USA
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23
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Affiliation(s)
- V Nangia
- Department of Ophthalmology, Harvard Medical School, Boston, MA 02116
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24
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Abstract
Standardised echography is well documented for its use in the evaluation of enlarged extraocular muscles in orbital disease, but is still a largely underdeveloped imaging method in Britain. This paper demonstrates the technique of muscle ultrasound scanning and the characteristic echographic findings in a variety of extraocular muscle diseases, as illustrated by five case reports. The role of echography in the management of such cases is discussed.
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Affiliation(s)
- A D Dick
- Department of Ophthalmology, Medical School, Foresterhill, Aberdeen, UK
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25
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Affiliation(s)
- V Nangia
- New England Eye Center, Tufts University School of Medicine, Boston, MA 02111
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26
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Abstract
A case of metastatic endophthalmitis due to Clostridium perfringens originating from the biliary tract is reported. The grave visual prognosis and the importance of early detection and treatment of the primary source of infection are emphasised.
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Affiliation(s)
- V Nangia
- University of Aberdeen, Sir Andrew and Lady Lewis Department of Opthalmology, Medical School, Foresterhill, Aberdeen
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27
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Chhabra S, Nangia V, Ingley KN. Changes in respiratory function tests during pregnancy. Indian J Physiol Pharmacol 1988; 32:56-60. [PMID: 3169961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Anatomical, physiological and biochemical adaptations that occur during pregnancy are profound. Changes in respiratory physiology are a part of the same process. In the present study of 70 selected women, 50 pregnant and nonpregnant control, it was found that out of seven parameters studied five showed changes. There were changes in respiratory frequency, tidal volume, vital capacity, inspiratory capacity and expiratory reserve volume. Maximum voluntary ventilation and timed vital capacity did not change. RF, VT, VC and IC rose significantly while ERV had a significant fall. These changes may be affecting ante-intranatal behaviour of pregnant women and their pregnancy outcome.
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Affiliation(s)
- S Chhabra
- Mahatma Gandhi Institute of Medical Sciences, Sevagram, Wardha
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