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Lefevre PLC, Wang Z, Teft W, Zou G, Van Viegen T, Linggi B, Jairath V, Feagan BG, Pai RK, Vande Casteele N. Identification of immune cell markers associated with ulcerative colitis histological disease activity in colonic biopsies. J Clin Pathol 2024:jcp-2023-209327. [PMID: 38418201 DOI: 10.1136/jcp-2023-209327] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 02/11/2024] [Indexed: 03/01/2024]
Abstract
AIMS Accurate determination of histological activity in ulcerative colitis (UC) is essential given its diagnostic and prognostic importance. Data on the relationship between histology and immune cell markers are limited. We aimed to evaluate the association between histological disease activity and immune cell marker concentration in colonic biopsies from patients with UC. METHODS Sigmoid colon biopsies from 20 patients with UC were retrospectively assessed using the Robarts Histopathology Index (RHI). Targeted mass spectrometry determined the concentration of 18 immune cell markers (cluster of differentiation (CD) 4, CD8, CD19, CD20, CD40, CD56, CD68, CD103, forkhead box p3 (FOXP3), human leucocyte antigen, DR alpha chain (HLA-DRA), interleukin 10 (IL-10), IL-23 subunit alpha (IL-23A), IL-23 receptor (IL-23R), IL-2 receptor alpha chain (IL-2RA), Ki67, lymphocyte-activation gene 3 (LAG-3), programmed cell death protein 1 (PD-1) and PD ligand 1 (PD-L1)). The association between RHI score and immune cell marker concentration was quantified using Spearman's rank correlation coefficient (ρ) and related 95% CIs. RESULTS Fourteen of the 18 immune cell marker proteins were detected, with tissue concentration ranging from 0.003 to 11.53 fmol/µg. The overall RHI score was positively correlated with CD19, CD20, CD40, FOXP3, LAG-3, PD-1 and PD-L1 concentration (ρ=0.596-0.799) and negatively correlated with CD56 concentration (ρ=-0.460). There was no significant association between RHI score and CD4, CD8, CD68, CD103, HLA-DRA or Ki67 concentration. CONCLUSIONS This study provides insight into the correlation between immune cell marker expression and histological disease activity and the possible molecular and immunological determinants underlying microscopic disease activity in UC.
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Affiliation(s)
| | | | | | - Guangyong Zou
- Alimentiv Inc, London, Ontario, Canada
- Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
| | | | | | - Vipul Jairath
- Alimentiv Inc, London, Ontario, Canada
- Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
- Department of Medicine, Western University, London, Ontario, Canada
| | - Brian G Feagan
- Alimentiv Inc, London, Ontario, Canada
- Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
- Department of Medicine, Western University, London, Ontario, Canada
| | - Rish K Pai
- Department of Laboratory Medicine & Pathology, Mayo Clinic Arizona, Scottsdale, Arizona, USA
| | - Niels Vande Casteele
- Alimentiv Inc, London, Ontario, Canada
- Department of Medicine, University of California, La Jolla, California, USA
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Linggi B, Cremer J, Wang Z, Van Viegen T, Vermeire S, Lefevre P, Shackelton LM, Jairath V, Teft W, Vande Casteele N, Verstockt B. Effect of storage time on peripheral blood mononuclear cell isolation from blood collected in vacutainer CPT™ tubes. J Immunol Methods 2023; 519:113504. [PMID: 37257687 DOI: 10.1016/j.jim.2023.113504] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 05/12/2023] [Accepted: 05/25/2023] [Indexed: 06/02/2023]
Abstract
BACKGROUND Clinical trials of novel therapies for the treatment of ulcerative colitis (UC) may benefit from immune cell profiling, however implementation of this methodology is limited in the multicenter trial setting by necessity of timely (within 6 to 8 h) isolation and processing of peripheral blood mononuclear cells (PBMC) from whole blood samples. Becton Dickinson Vacutainer CPT™ Cell Preparation Tubes (CPT™) limit required processing prior to shipping to a central lab to an initial centrifugation step within 24 h of sample collection. As shipping may delay final processing beyond 24 h, we analyzed cell viability and T cell composition in whole blood stored in CPT™ to determine if their use may accommodate processing delays typical for multicenter clinical trials. METHODS Whole blood samples from 3 patients with UC were collected in CPT™ (15 tubes/patient) and PBMC were processed at various timepoints (24-96 h). Cell viability and T cell composition (26 types) were evaluated by flow cytometry. Variability between technical and biological replicates was evaluated in the context of cell-type abundance, delayed processing time, and data normalization. RESULTS Total cell viability was <50% when processing was delayed to 48 h after collection and was further reduced at later processing timepoints. The effect of delayed processing on cell abundance varied widely across cell types, with CD4+, CD8+, naïve effector CD8+, and Tcm CD4 + T cells displaying the least variability in abundance with delayed processing. Normalization of cell counts to cell types other than total T cells corrected for the effect of delayed processing for several cell types, particularly Th17. CONCLUSIONS Based on these data, processing of PBMC in CPT™ should ideally be performed within 48 h. Delayed processing of PBMC in CPT™ may be considered for cell types that are robust to these conditions. Normalization of cell abundance to different parental cell-types may reduce variability in quantitation and should be used in conjunction with the expected effect size to meet the experimental goals of a multicenter clinical trial.
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Affiliation(s)
- Bryan Linggi
- Alimentiv Inc., 100 Dundas Street, Suite 200, London, ON, Canada.
| | - Jonathan Cremer
- Department of Microbiology and Immunology, Laboratory of Allergy and Clinical Immunology, KU Leuven, Herestraat 49, Leuven, Belgium; Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases & Metabolism (CHROMETA), KU Leuven, Herestraat 49, Leuven, Belgium.
| | - Zhongya Wang
- Alimentiv Inc., 100 Dundas Street, Suite 200, London, ON, Canada.
| | - Tanja Van Viegen
- Alimentiv Inc., 100 Dundas Street, Suite 200, London, ON, Canada.
| | - Séverine Vermeire
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases & Metabolism (CHROMETA), KU Leuven, Herestraat 49, Leuven, Belgium; Department of Gastroenterology and Hepatology, University Hospitals Leuven, KU Leuven, Herestraat 49, Leuven, Belgium.
| | - Pavine Lefevre
- Alimentiv Inc., 100 Dundas Street, Suite 200, London, ON, Canada.
| | | | - Vipul Jairath
- Alimentiv Inc., 100 Dundas Street, Suite 200, London, ON, Canada; Departments of Medicine and Epidemiology and Biostatistics, Western University, 1151 Richmond St, London, ON, Canada.
| | - Wendy Teft
- Alimentiv Inc., 100 Dundas Street, Suite 200, London, ON, Canada.
| | - Niels Vande Casteele
- Alimentiv Inc., 100 Dundas Street, Suite 200, London, ON, Canada; Inflammatory Bowel Disease Center, Division of Gastroenterology, Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, USA.
| | - Bram Verstockt
- Translational Research Center for Gastrointestinal Disorders (TARGID), Department of Chronic Diseases & Metabolism (CHROMETA), KU Leuven, Herestraat 49, Leuven, Belgium; Department of Gastroenterology and Hepatology, University Hospitals Leuven, KU Leuven, Herestraat 49, Leuven, Belgium.
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Monaghan KA, Hoi A, Gamell C, Tai TY, Linggi B, Jordan J, Cesaroni M, Sato T, Ng M, Oon S, Benson J, Wicks I, Morand E, Wilson N. CSL362 potently and specifically depletes pDCs invitro and ablates SLE-immune complex-induced IFN responses. iScience 2023; 26:107173. [PMID: 37456846 PMCID: PMC10338305 DOI: 10.1016/j.isci.2023.107173] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 03/16/2023] [Accepted: 06/14/2023] [Indexed: 07/18/2023] Open
Abstract
Systemic lupus erythematosus (SLE) is an autoimmune disease with significant morbidity and mortality. Type I interferon (IFN) drives SLE pathology and plasmacytoid dendritic cells (pDCs) are potent producers of IFN; however, the specific effects of pDC depletion have not been demonstrated. We show CD123 was highly expressed on pDCs and the anti-CD123 antibody CSL362 potently depleted pDCs in vitro. CSL362 pre-treatment abrogated the induction of IFNα and IFN-induced gene transcription following stimulation with SLE patient-derived serum or immune complexes. RNA transcripts induced in pDCs by ex vivo stimulation with TLR ligands were reflected in gene expression profiles of SLE blood, and correlated with disease severity. TLR ligand-induced protein production by SLE patient peripheral mononuclear cells was abrogated by CSL362 pre-treatment including proteins over expressed in SLE patient serum. These findings implicate pDCs as key drivers in the cellular activation and production of soluble factors seen in SLE.
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Affiliation(s)
| | - Alberta Hoi
- Centre for Inflammatory Disease, School of Clinical Sciences, Monash University, Melbourne, VIC 3168, Australia
- Monash Health, Clayton, VIC 3168, Australia
| | - Cristina Gamell
- Research and Development, CSL Limited, Melbourne, VIC 3010, Australia
| | - Tsin Yee Tai
- Research and Development, CSL Limited, Melbourne, VIC 3010, Australia
| | - Bryan Linggi
- Janssen Research and Development LLC, Spring House, PA 19477, USA
| | - Jarrat Jordan
- Janssen Research and Development LLC, Spring House, PA 19477, USA
| | - Matteo Cesaroni
- Janssen Research and Development LLC, Spring House, PA 19477, USA
| | - Takahiro Sato
- Janssen Research and Development LLC, Spring House, PA 19477, USA
| | - Milica Ng
- Research and Development, CSL Limited, Melbourne, VIC 3010, Australia
| | - Shereen Oon
- The Walter and Eliza Hall Institute, Parkville, VIC 3052, Australia
- The Royal Melbourne Hospital, Parkville, VIC 3050, Australia
- The University of Melbourne Parkville, Parkville, VIC 3010, Australia
| | | | - Ian Wicks
- The Walter and Eliza Hall Institute, Parkville, VIC 3052, Australia
- The Royal Melbourne Hospital, Parkville, VIC 3050, Australia
- The University of Melbourne Parkville, Parkville, VIC 3010, Australia
| | - Eric Morand
- Centre for Inflammatory Disease, School of Clinical Sciences, Monash University, Melbourne, VIC 3168, Australia
- Monash Health, Clayton, VIC 3168, Australia
| | - Nicholas Wilson
- Research and Development, CSL Limited, Melbourne, VIC 3010, Australia
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Ma C, MacDonald JK, Nguyen TM, Vande Casteele N, Linggi B, Lefevre P, Wang Y, Feagan BG, Jairath V. Pharmacological Interventions for the Prevention and Treatment of Immune Checkpoint Inhibitor-Associated Enterocolitis: A Systematic Review. Dig Dis Sci 2022; 67:1128-1155. [PMID: 33770330 DOI: 10.1007/s10620-021-06948-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Accepted: 03/08/2021] [Indexed: 12/11/2022]
Abstract
BACKGROUND Patients treated with immune checkpoint inhibitors (ICIs) may develop ICI-associated enterocolitis, for which there is no approved treatment. AIMS We aimed to systematically review the efficacy and safety of medical interventions for the prevention and treatment of ICI-associated enterocolitis. METHODS MEDLINE, EMBASE, and the Cochrane Library were searched to identify randomized controlled trials (RCTs), cohort and case-control studies, and case series/reports, evaluating interventions (including corticosteroids, biologics, aminosalicylates, immunosuppressants, and fecal transplantation) for ICI-associated enterocolitis. Clinical, endoscopic, and histologic efficacy endpoints were evaluated. The Grading of Recommendations, Assessment, Development, and Evaluation criteria were used to assess overall quality of evidence. RESULTS A total of 160 studies (n = 1514) were included (one RCT, 3 retrospective cohort studies, 156 case reports/case series). Very low quality evidence from one RCT suggests budesonide is not effective for prevention of ICI-associated enterocolitis in ipilimumab-treated patients (relative risk 0.93 [95% confidence interval 0.56, 1.56]). Very low quality evidence suggests that corticosteroids, infliximab, and vedolizumab may be effective for treatment of ICI-associated enterocolitis by inducing clinical response and remission. No validated indices for measuring disease activity were used. Biologic treatment was used in 42% (641/1528) of patients, as reported in 97 studies. ICIs were discontinued in 65% (457/702) of patients, as reported in 63 studies. CONCLUSIONS Current treatment recommendations for ICI-associated enterocolitis are based on very low quality evidence, primarily from case reports and case series. Large-scale prospective cohort studies and RCTs are needed to develop prophylactic and therapeutic treatments to minimize interruption or discontinuation of oncological therapies.
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Affiliation(s)
- Christopher Ma
- Division of Gastroenterology and Hepatology, Departments of Medicine and Community Health Sciences, Cumming School of Medicine, University of Calgary, 3280 Hospital Drive NW, Calgary, AB, T2N 4Z6, Canada.
- Alimentiv Inc (Formerly Robarts Clinical Trials), 100 Dundas St, Suite #200, London, ON, N6A 5B6, Canada.
| | - John K MacDonald
- Alimentiv Inc (Formerly Robarts Clinical Trials), 100 Dundas St, Suite #200, London, ON, N6A 5B6, Canada
| | - Tran M Nguyen
- Alimentiv Inc (Formerly Robarts Clinical Trials), 100 Dundas St, Suite #200, London, ON, N6A 5B6, Canada
| | - Niels Vande Casteele
- Alimentiv Inc (Formerly Robarts Clinical Trials), 100 Dundas St, Suite #200, London, ON, N6A 5B6, Canada
- Division of Gastroenterology, University of California San Diego, 4350 Executive Drive, Suite 210, La Jolla, San Diego, CA, 92121, USA
| | - Bryan Linggi
- Alimentiv Inc (Formerly Robarts Clinical Trials), 100 Dundas St, Suite #200, London, ON, N6A 5B6, Canada
| | - Pavine Lefevre
- Alimentiv Inc (Formerly Robarts Clinical Trials), 100 Dundas St, Suite #200, London, ON, N6A 5B6, Canada
| | - Yinghong Wang
- Department of Gastroenterology, Hepatology and Nutrition, University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd, Houston, TX, 77030, USA
| | - Brian G Feagan
- Alimentiv Inc (Formerly Robarts Clinical Trials), 100 Dundas St, Suite #200, London, ON, N6A 5B6, Canada
- Departments of Medicine, Epidemiology, and Biostatistics, Western University, 1151 Richmond St, London, ON, N6A 3K7, Canada
| | - Vipul Jairath
- Alimentiv Inc (Formerly Robarts Clinical Trials), 100 Dundas St, Suite #200, London, ON, N6A 5B6, Canada
- Departments of Medicine, Epidemiology, and Biostatistics, Western University, 1151 Richmond St, London, ON, N6A 3K7, Canada
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Porter AC, Aubrecht J, Birch C, Braun J, Cuff C, Dasgupta S, Gale JD, Hinton R, Hoffmann SC, Honig G, Linggi B, Schito M, Casteele NV, Sauer JM. Biomarkers of Crohn's Disease to Support the Development of New Therapeutic Interventions. Inflamm Bowel Dis 2020; 26:1498-1508. [PMID: 32840322 PMCID: PMC7500523 DOI: 10.1093/ibd/izaa215] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Indexed: 12/18/2022]
Abstract
BACKGROUND Currently, 2 coprimary end points are used by health authorities to determine the effectiveness of therapeutic interventions in patients with Crohn's disease (CD): symptomatic remission (patient-reported outcome assessment) and endoscopic remission (ileocolonoscopy). However, there is lack of accepted biomarkers to facilitate regulatory decision-making in the development of novel therapeutics for the treatment of CD. METHODS With support from the Helmsley Charitable Trust, Critical Path Institute formed the Crohn's Disease Biomarkers preconsortium (CDBpC) with members from the pharmaceutical industry, academia, and nonprofit organizations to evaluate the CD biomarker landscape. Biomarkers were evaluated based on biological relevance, availability of biomarker assays, and clinical validation data. RESULTS The CDBpC identified the most critical need as pharmacodynamic/response biomarkers to monitor disease activity in response to therapeutic intervention. Fecal calprotectin (FC) and serum C-reactive protein (CRP) were identified as biomarkers ready for the regulatory qualification process. A number of exploratory biomarkers and potential panels of these biomarkers was also identified for additional development. Given the different factors involved in CD and disease progression, a combination of biomarkers, including inflammatory, tissue injury, genetic, and microbiome-associated biomarkers, will likely have the most utility. CONCLUSIONS The primary focus of the Inflammatory Bowel Disease Regulatory Science Consortium will be development of exploratory biomarkers and the qualification of FC and CRP for IBD. The Inflammatory Bowel Disease Regulatory Science Consortium, focused on tools to support IBD drug development, will operate in the precompetitive space to share data, biological samples for biomarker testing, and assay information for novel biomarkers.
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Affiliation(s)
| | | | | | | | | | | | - Jeremy D Gale
- Pfizer Worldwide, Research, Development and Medical, Cambridge, MA, USA
| | - Robert Hinton
- The David R Clare and Margaret C Clare Foundation, Morristown, NJ, USA
| | | | | | | | | | - Niels Vande Casteele
- Department of Medicine, University of California San Diego, CA, USA,Robarts Clinical Trials Inc., London, ON, Canada
| | - John-Michael Sauer
- Critical Path Institute, AZ, USA,Address correspondence to: John-Michael Sauer, Critical Path Institute, 1730 E. River Rd Suite 200, Tucson, Arizona 85718, USA. E-mail:
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West NR, Hegazy AN, Owens BMJ, Bullers SJ, Linggi B, Buonocore S, Coccia M, Görtz D, This S, Stockenhuber K, Pott J, Friedrich M, Ryzhakov G, Baribaud F, Brodmerkel C, Cieluch C, Rahman N, Müller-Newen G, Owens RJ, Kühl AA, Maloy KJ, Plevy SE, Keshav S, Travis SPL, Powrie F. Oncostatin M drives intestinal inflammation and predicts response to tumor necrosis factor-neutralizing therapy in patients with inflammatory bowel disease. Nat Med 2017; 23:579-589. [PMID: 28368383 PMCID: PMC5420447 DOI: 10.1038/nm.4307] [Citation(s) in RCA: 475] [Impact Index Per Article: 67.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Accepted: 02/17/2017] [Indexed: 02/08/2023]
Abstract
Inflammatory bowel diseases (IBD), including Crohn's disease (CD) and ulcerative colitis (UC), are complex chronic inflammatory conditions of the gastrointestinal tract that are driven by perturbed cytokine pathways. Anti-tumor necrosis factor-α (TNF) antibodies are mainstay therapies for IBD. However, up to 40% of patients are nonresponsive to anti-TNF agents, which makes the identification of alternative therapeutic targets a priority. Here we show that, relative to healthy controls, inflamed intestinal tissues from patients with IBD express high amounts of the cytokine oncostatin M (OSM) and its receptor (OSMR), which correlate closely with histopathological disease severity. The OSMR is expressed in nonhematopoietic, nonepithelial intestinal stromal cells, which respond to OSM by producing various proinflammatory molecules, including interleukin (IL)-6, the leukocyte adhesion factor ICAM1, and chemokines that attract neutrophils, monocytes, and T cells. In an animal model of anti-TNF-resistant intestinal inflammation, genetic deletion or pharmacological blockade of OSM significantly attenuates colitis. Furthermore, according to an analysis of more than 200 patients with IBD, including two cohorts from phase 3 clinical trials of infliximab and golimumab, high pretreatment expression of OSM is strongly associated with failure of anti-TNF therapy. OSM is thus a potential biomarker and therapeutic target for IBD, and has particular relevance for anti-TNF-resistant patients.
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Affiliation(s)
- Nathaniel R. West
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
- Translational Gastroenterology Unit, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Ahmed N. Hegazy
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
- Translational Gastroenterology Unit, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | | | | | - Bryan Linggi
- Janssen Research and Development LLC, Raritan, NJ, USA
| | - Sofia Buonocore
- Sir William Dunn School of Pathology, University of Oxford, Oxford, UK
| | - Margherita Coccia
- Sir William Dunn School of Pathology, University of Oxford, Oxford, UK
| | - Dieter Görtz
- Institute of Biochemistry and Molecular Biology, RWTH Aachen University, Aachen, Germany
| | - Sébastien This
- Translational Gastroenterology Unit, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Krista Stockenhuber
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
- Translational Gastroenterology Unit, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Johanna Pott
- Sir William Dunn School of Pathology, University of Oxford, Oxford, UK
| | | | - Grigory Ryzhakov
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
| | | | | | - Constanze Cieluch
- Medical Department, Division of Gastroenterology, Infectiology and Rheumatology, Charité–Universitätsmedizin Berlin, Germany
| | - Nahid Rahman
- OPPF-UK, The Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Oxford, UK
| | - Gerhard Müller-Newen
- Institute of Biochemistry and Molecular Biology, RWTH Aachen University, Aachen, Germany
| | - Raymond J. Owens
- OPPF-UK, The Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Oxford, UK
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, UK
| | - Anja A. Kühl
- Medical Department, Division of Gastroenterology, Infectiology and Rheumatology, Charité–Universitätsmedizin Berlin, Germany
| | - Kevin J. Maloy
- Sir William Dunn School of Pathology, University of Oxford, Oxford, UK
| | | | | | - Satish Keshav
- Translational Gastroenterology Unit, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Simon P. L. Travis
- Translational Gastroenterology Unit, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Fiona Powrie
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
- Translational Gastroenterology Unit, Nuffield Department of Medicine, University of Oxford, Oxford, UK
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Monaghan K, Tai T, Benson J, Linggi B, Oon S, Ng M, Hoi A, Morand E, Wilson N. OP0041 JNJ-473 Potently and Specifically Depletes PDCS In SLE Patient Blood In Vitro and Ablates TLR9-Induced Interferon Alpha Responses. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.1285] [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: 11/03/2022]
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Abstract
BACKGROUND Preeclampsia contributes significantly to pregnancy-associated morbidity and mortality as well as future risk of cardiovascular disease in mother and offspring, and preeclampsia in offspring. The lack of reliable methods for early detection limits the opportunities for prevention, diagnosis, and timely treatment. PURPOSE The purpose of this study was to explore distinct DNA methylation patterns associated with preeclampsia in both maternal cells and fetal-derived tissue that represent potential biomarkers to predict future preeclampsia and inheritance in children. METHOD A convenience sample of nulliparous women (N = 55) in the first trimester of pregnancy was recruited for this prospective study. Genome-wide DNA methylation was quantified in first-trimester maternal peripheral white blood cells and placental chorionic tissue from normotensive women and those with preeclampsia (n = 6/group). RESULTS Late-onset preeclampsia developed in 12.7% of women. Significant differences in DNA methylation were identified in 207 individual linked cytosine and guanine (CpG) sites in maternal white blood cells collected in the first trimester (132 sites with gain and 75 sites with loss of methylation), which were common to approximately 75% of the differentially methylated CpG sites identified in chorionic tissue of fetal origin. CONCLUSION This study is the first to identify maternal epigenetic targets and common targets in fetal-derived tissue that represent putative biomarkers for early detection and heritable risk of preeclampsia. Findings may pave the way for diagnosis of preeclampsia prior to its clinical presentation and acute damaging effects, and the potential for prevention of the detrimental long-term sequelae.
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Affiliation(s)
- Cindy M Anderson
- College of Nursing, The Ohio State University, Columbus, Ohio, USA
| | - Jody L Ralph
- Department of Nursing, College of Nursing and Professional Disciplines, University of North Dakota, Grand Forks, ND, USA
| | - Michelle L Wright
- Department of Nursing, College of Nursing and Professional Disciplines, University of North Dakota, Grand Forks, ND, USA
| | - Bryan Linggi
- Pacific Northwest National Laboratory, U.S. Department of Energy, Richland, WA, USA
| | - Joyce E Ohm
- Department of Biochemistry and Microbiology, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND, USA
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Hess BM, Xue J, Markillie LM, Taylor RC, Wiley HS, Ahring BK, Linggi B. Coregulation of Terpenoid Pathway Genes and Prediction of Isoprene Production in Bacillus subtilis Using Transcriptomics. PLoS One 2013; 8:e66104. [PMID: 23840410 PMCID: PMC3686787 DOI: 10.1371/journal.pone.0066104] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Accepted: 05/02/2013] [Indexed: 11/19/2022] Open
Abstract
The isoprenoid pathway converts pyruvate to isoprene and related isoprenoid compounds in plants and some bacteria. Currently, this pathway is of great interest because of the critical role that isoprenoids play in basic cellular processes, as well as the industrial value of metabolites such as isoprene. Although the regulation of several pathway genes has been described, there is a paucity of information regarding system level regulation and control of the pathway. To address these limitations, we examined Bacillus subtilis grown under multiple conditions and determined the relationship between altered isoprene production and gene expression patterns. We found that with respect to the amount of isoprene produced, terpenoid genes fall into two distinct subsets with opposing correlations. The group whose expression levels positively correlated with isoprene production included dxs, which is responsible for the commitment step in the pathway, ispD, and two genes that participate in the mevalonate pathway, yhfS and pksG. The subset of terpenoid genes that inversely correlated with isoprene production included ispH, ispF, hepS, uppS, ispE, and dxr. A genome-wide partial least squares regression model was created to identify other genes or pathways that contribute to isoprene production. These analyses showed that a subset of 213 regulated genes was sufficient to create a predictive model of isoprene production under different conditions and showed correlations at the transcriptional level. We conclude that gene expression levels alone are sufficiently informative about the metabolic state of a cell that produces increased isoprene and can be used to build a model that accurately predicts production of this secondary metabolite across many simulated environmental conditions.
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Affiliation(s)
- Becky M. Hess
- Bioproducts, Sciences and Engineering Laboratory, Washington State University Tri-Cities, Richland, Washington, United States of America
- Chemical and Biological Signature Sciences Group, Pacific Northwest National Laboratory, Richland, Washington, United States of America
| | - Junfeng Xue
- Bioproducts, Sciences and Engineering Laboratory, Washington State University Tri-Cities, Richland, Washington, United States of America
| | - Lye Meng Markillie
- Fundamental and Computational Sciences, Pacific Northwest National Laboratory, Richland, Washington, United States of America
| | - Ronald C. Taylor
- Computational Biology and Bioinformatics Group, Pacific Northwest National Laboratory, Richland, Washington, United States of America
| | - H. Steven Wiley
- Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington, United States of America
| | - Birgitte K. Ahring
- Bioproducts, Sciences and Engineering Laboratory, Washington State University Tri-Cities, Richland, Washington, United States of America
| | - Bryan Linggi
- Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington, United States of America
- * E-mail:
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Schoeberl B, Pace EA, Fitzgerald JB, Harms BD, Xu L, Nie L, Linggi B, Kalra A, Paragas V, Bukhalid R, Grantcharova V, Kohli N, West KA, Leszczyniecka M, Feldhaus MJ, Kudla AJ, Nielsen UB. Therapeutically targeting ErbB3: a key node in ligand-induced activation of the ErbB receptor-PI3K axis. Sci Signal 2009; 2:ra31. [PMID: 19567914 DOI: 10.1126/scisignal.2000352] [Citation(s) in RCA: 258] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The signaling network downstream of the ErbB family of receptors has been extensively targeted by cancer therapeutics; however, understanding the relative importance of the different components of the ErbB network is nontrivial. To explore the optimal way to therapeutically inhibit combinatorial, ligand-induced activation of the ErbB-phosphatidylinositol 3-kinase (PI3K) axis, we built a computational model of the ErbB signaling network that describes the most effective ErbB ligands, as well as known and previously unidentified ErbB inhibitors. Sensitivity analysis identified ErbB3 as the key node in response to ligands that can bind either ErbB3 or EGFR (epidermal growth factor receptor). We describe MM-121, a human monoclonal antibody that halts the growth of tumor xenografts in mice and, consistent with model-simulated inhibitor data, potently inhibits ErbB3 phosphorylation in a manner distinct from that of other ErbB-targeted therapies. MM-121, a previously unidentified anticancer therapeutic designed using a systems approach, promises to benefit patients with combinatorial, ligand-induced activation of the ErbB signaling network that are not effectively treated by current therapies targeting overexpressed or mutated oncogenes.
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Affiliation(s)
- Birgit Schoeberl
- Merrimack Pharmaceuticals, One Kendall Square, Building 700, Cambridge, MA 02139, USA
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11
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Abstract
The ErbB family of four receptor tyrosine kinases occupies a central role in a wide variety of biological processes from neuronal development to breast cancer. New information continues to expand their biologic significance and to unravel the molecular mechanisms that underlie the signaling capacity of these receptors. Here, we review several aspects of ErbB receptor physiology for which new and significant information is available. These include ligand-dependent receptor dimerization and kinase activation, which is a prerequisite for all subsequent growth factor-dependent cell responses. We also address novel roles of receptor fragments in signaling, trafficking to intracellular sites, such as the nucleus, and ErbB roles in non-cancer disease processes, including schizophrenia, chronic renal disease, hypertension, and the cellular entry of infectious pathogens.
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Affiliation(s)
- Bryan Linggi
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232-0146, USA
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12
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Abstract
ErbB-4 is cleaved by alpha- and gamma-secretases to release a soluble 80-kDa intracellular domain, termed s80, which translocates to the nucleus. s80 is present in the nucleus of normal and cancerous mammary cells and is predicted to have a role in cell differentiation. To further investigate the mechanism by which s80 may mediate differentiation, we tested whether s80 regulates Eto2, a transcriptional corepressor that is involved in erythrocyte differentiation and is also implicated in human breast cancer. Here we show that ligand binding to ErbB-4 causes s80 translocation to the nucleus, where it colocalizes and interacts with Eto2. Expression of s80 blocks Eto2-mediated transcriptional repression of a heterologous promoter. This effect on Eto2 does not require s80 kinase activity and is mediated by the carboxyl-terminal region of s80. Although other cell surface receptors regulate transcription by activating signal transduction cascades, these data present a novel mechanism of corepressor regulation and suggest a role for Eto2 in ErbB-4-dependent differentiation.
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Affiliation(s)
- Bryan Linggi
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, USA
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13
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Abstract
The ErbB-4 receptor tyrosine kinase homo- and heterodimerizes following heregulin binding, which provokes increased levels of tyrosine autophosphorylation. Unique to the ErbB family, ErbB-4 is then proteolytically cleaved by alpha- and gamma-secretase to produce an 80 kDa intracellular domain (s80 ICD) fragment. This fragment is found in both the cytoplasm and nucleus of many normal and cancer cells and can interact with transcription factors in the cytoplasm and nucleus. Since the s80 ICD lacks ectodomain sequences known to play a major role in dimerization of ErbB family members, we asked whether the s80 ICD is an active tyrosine kinase. Here, we demonstrate that the s80 ICD is a constitutively active tyrosine kinase and can form homodimers. The s80 ICD is autophosphorylated in cells and can phosphorylate an exogenous substrate in vitro. Also, the s80 ICD can coassociate and dimers are detected by chemical crosslinking. This is the first example of constitutive kinase activation and dimerization totally within the cytoplasmic domain of an ErbB receptor and suggests that the s80 ICD may function to phosphorylate substrates in the cytoplasm or nucleus.
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Affiliation(s)
- B Linggi
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232-0146, USA
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14
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Steffen B, Serve H, Berdel WE, Agrawal S, Linggi B, Büchner T, Hiebert SW, Müller-Tidow C. Specific protein redirection as a transcriptional therapy approach for t(8;21) leukemia. Proc Natl Acad Sci U S A 2003; 100:8448-53. [PMID: 12819347 PMCID: PMC166249 DOI: 10.1073/pnas.1330293100] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Important progress has been achieved in the knowledge about the pathogenesis of cancer. However, despite these advances, the therapeutic strategies are still limited. Leukemias are often characterized by specific balanced translocations, with the t(8;21) balanced translocation being the most frequent chromosomal aberration in acute myeloid leukemia (AML). This translocation produces the AML1-ETO fusion protein, which binds to AML1 target promoter sequences. Transcriptional repression of AML1-dependent genes by AML1-ETO and associated corepressors represents the pathogenetic mechanisms of t(8;21). Here, we show that targeting of AML1-ETO to essential, MYB-dependent gene promoters induces t(8;21)-restricted cell death. We constructed a chimeric protein that contained the MYB DNA-binding domain and the AML1-binding domain of myeloid Elf-1-like factor (MEF). This protein associated with AML1-ETO and directed the complex to MYB-responsive promoters in vitro and in vivo. In the presence of AML1-ETO, the chimeric protein repressed the activity of MYB-responsive promoters, rapidly induced apoptosis, and specifically inhibited colony growth. All these effects occurred only in AML1-ETO-positive cells, whereas no adverse effects were observed in cells not expressing AML1-ETO. Taken together, this study demonstrates that redirection of oncogenic proteins can be used as a strategy to dramatically influence their cellular effects, with the ultimate goal to design highly specific therapies for cancer.
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MESH Headings
- Acute Disease
- Animals
- Apoptosis/physiology
- Binding Sites
- COS Cells
- Chromosomes, Human, Pair 21/genetics
- Chromosomes, Human, Pair 21/ultrastructure
- Chromosomes, Human, Pair 8/genetics
- Chromosomes, Human, Pair 8/ultrastructure
- Core Binding Factor Alpha 2 Subunit
- DNA-Binding Proteins/chemistry
- DNA-Binding Proteins/genetics
- DNA-Binding Proteins/physiology
- Genes, myb
- Humans
- Leukemia, Myeloid/genetics
- Leukemia, Myeloid/pathology
- Leukemia, Myeloid/therapy
- Macromolecular Substances
- Mice
- Neoplasm Proteins/genetics
- Neoplasm Proteins/physiology
- Oncogene Proteins/genetics
- Oncogene Proteins, Fusion/genetics
- Oncogene Proteins, Fusion/physiology
- Promoter Regions, Genetic/genetics
- Protein Binding
- Protein Structure, Tertiary
- Proto-Oncogene Proteins c-kit
- Proto-Oncogene Proteins c-myb/chemistry
- Proto-Oncogene Proteins c-myb/physiology
- RUNX1 Translocation Partner 1 Protein
- Recombinant Fusion Proteins/genetics
- Recombinant Fusion Proteins/physiology
- Substrate Specificity
- Transcription Factors/chemistry
- Transcription Factors/genetics
- Transcription Factors/physiology
- Transcription, Genetic
- Translocation, Genetic
- Tumor Cells, Cultured
- Tumor Stem Cell Assay
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Affiliation(s)
- Björn Steffen
- Department of Medicine, Hematology/Oncology,
University of Münster, 48129 Münster, Germany; and
Department of Biochemistry, Vanderbilt
University School of Medicine, Nashville, TN 37232
| | - Hubert Serve
- Department of Medicine, Hematology/Oncology,
University of Münster, 48129 Münster, Germany; and
Department of Biochemistry, Vanderbilt
University School of Medicine, Nashville, TN 37232
- To whom correspondence should be addressed at: Department of Medicine,
Hematology/Oncology, University of Münster, Albert-Schweitzer-Strasse 33,
48129 Münster, Germany. E-mail:
| | - Wolfgang E. Berdel
- Department of Medicine, Hematology/Oncology,
University of Münster, 48129 Münster, Germany; and
Department of Biochemistry, Vanderbilt
University School of Medicine, Nashville, TN 37232
| | - Shuchi Agrawal
- Department of Medicine, Hematology/Oncology,
University of Münster, 48129 Münster, Germany; and
Department of Biochemistry, Vanderbilt
University School of Medicine, Nashville, TN 37232
| | - Bryan Linggi
- Department of Medicine, Hematology/Oncology,
University of Münster, 48129 Münster, Germany; and
Department of Biochemistry, Vanderbilt
University School of Medicine, Nashville, TN 37232
| | - Thomas Büchner
- Department of Medicine, Hematology/Oncology,
University of Münster, 48129 Münster, Germany; and
Department of Biochemistry, Vanderbilt
University School of Medicine, Nashville, TN 37232
| | - Scott W. Hiebert
- Department of Medicine, Hematology/Oncology,
University of Münster, 48129 Münster, Germany; and
Department of Biochemistry, Vanderbilt
University School of Medicine, Nashville, TN 37232
| | - Carsten Müller-Tidow
- Department of Medicine, Hematology/Oncology,
University of Münster, 48129 Münster, Germany; and
Department of Biochemistry, Vanderbilt
University School of Medicine, Nashville, TN 37232
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15
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Hiebert SW, Reed-Inderbitzin EF, Amann J, Irvin B, Durst K, Linggi B. The t(8;21) fusion protein contacts co-repressors and histone deacetylases to repress the transcription of the p14ARF tumor suppressor. Blood Cells Mol Dis 2003; 30:177-83. [PMID: 12732181 DOI: 10.1016/s1079-9796(03)00021-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [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] [Indexed: 10/27/2022]
Abstract
The t(8;21) is one of the most frequent chromosomal translocations associated with acute leukemia. The translocation fuses the DNA binding domain of AML1 to nearly all of the ETO co-repressor. ETO associates with the mSin3 and N-CoR co-repressors as well as histone deacetylases 1, 2, and 3. Although this is one of the most frequent chromosomal translocations in acute leukemia, accounting for 10-15% of the cases of acute myeloid leukemia (AML), the direct targets for transcriptional regulation that stimulate leukemogenesis are unknown. We found that AML1-ETO repressed the promoter of p14(ARF) tumor suppressor in transient transfection assays and reduced endogenous levels of p14(ARF) expression in multiple cell types. Chromatin immunoprecipitation assays demonstrated that AML1-ETO bound to the p14(ARF) promoter. In acute myeloid leukemia samples containing the t(8;21), levels of p14(ARF) mRNA were markedly lower when compared to other acute myeloid leukemias. Therefore, p14(ARF) is a direct transcriptional target of AML1-ETO.
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Affiliation(s)
- Scott W Hiebert
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232, USA.
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16
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Linggi B, Müller-Tidow C, van de Locht L, Hu M, Nip J, Serve H, Berdel WE, van der Reijden B, Quelle DE, Rowley JD, Cleveland J, Jansen JH, Pandolfi PP, Hiebert SW. The t(8;21) fusion protein, AML1 ETO, specifically represses the transcription of the p14(ARF) tumor suppressor in acute myeloid leukemia. Nat Med 2002; 8:743-50. [PMID: 12091906 DOI: 10.1038/nm726] [Citation(s) in RCA: 213] [Impact Index Per Article: 9.7] [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] [Indexed: 12/16/2022]
Abstract
The t(8;21) is one of the most frequent chromosomal translocations associated with acute leukemia. This translocation creates a fusion protein consisting of the acute myeloid leukemia-1 transcription factor and the eight-twenty-one corepressor (AML1 ETO), which represses transcription through AML1 (RUNX1) DNA binding sites and immortalizes hematopoietic progenitor cells. We have identified the p14(ARF) tumor suppressor, a mediator of the p53 oncogene checkpoint, as a direct transcriptional target of AML1 ETO. AML1 ETO repressed the p14(ARF) promoter and reduced endogenous levels of p14(ARF) expression in multiple cell types. In contrast, AML1 stimulated p14(ARF) expression and induced phenotypes consistent with cellular senescence. Chromatin immunoprecipitation assays demonstrated that AML1 ETO was specifically bound to the p14(ARF) promoter. In acute myeloid leukemia samples containing the t(8;21), levels of p14(ARF) mRNA were markedly lower when compared with other acute myeloid leukemias lacking this translocation. Repression of p14(ARF) may explain why p53 is not mutated in t(8;21)-containing leukemias and suggests that p14(ARF) is an important tumor suppressor in a large number of human leukemias.
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MESH Headings
- Antigens, CD/analysis
- CD4 Antigens/analysis
- Chromosomes, Human, Pair 21
- Chromosomes, Human, Pair 8
- Core Binding Factor Alpha 2 Subunit
- Gene Expression Regulation, Neoplastic
- Genes, Reporter
- Genes, Tumor Suppressor
- Hematopoietic Stem Cells/pathology
- Humans
- K562 Cells
- Leukemia, Myeloid, Acute/genetics
- Oncogene Proteins, Fusion/genetics
- Oncogene Proteins, Fusion/metabolism
- Plasmids
- RUNX1 Translocation Partner 1 Protein
- Repressor Proteins/metabolism
- Transcription Factors/genetics
- Transcription Factors/metabolism
- Transcription, Genetic/physiology
- Translocation, Genetic
- Tumor Cells, Cultured
- Tumor Suppressor Protein p14ARF/genetics
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Affiliation(s)
- Bryan Linggi
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
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17
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Heibert SW, Lutterbach B, Durst K, Wang L, Linggi B, Wu S, Wood L, Amann J, King D, Hou Y. Mechanisms of transcriptional repression by the t(8;21)-, t(12;21)-, and inv(16)-encoded fusion proteins. Cancer Chemother Pharmacol 2001; 48 Suppl 1:S31-4. [PMID: 11587363 DOI: 10.1007/s002800100302] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
AML-1 is one of the most frequently translocated genes in human leukemia. AML-1 binds DNA and activates or represses transcription, while the chromosomal translocation fusion proteins in acute myeloid leukemia subvert these functions. The t(8;21) is the second most frequent translocation in acute myeloid leukemia and creates a fusion between the DNA binding domain of AML-1 and the ETO (also known as MTG8) corepressor. The t(12;21) is found in up to 25% of pediatric B cell acute lymphoblastic leukemias and fuses the ETS family transcription factor TEL to the amino terminus of AML-1. In addition, the inv(16), the most frequent translocation in acute myeloid leukemia, fuses the AML-1 cofactor CBFbeta to the smooth muscle myosin heavy chain MYH11. Both the t(8;21) and t(12;21) create transcriptional repressors that impair AML-1 target gene expression. We demonstrated that the fusion proteins encoded by these translocations contact the nuclear hormone corepressors (N-CoR/SMRT), mSin3A, and histone deacetylases. We have also found that both TEL and AML-1 interact with mSin3A. TEL also binds N-CoR and histone deacetylase-3, indicating that wild-type TEL is a transcriptional repressor. The t(12;21) fuses the mSin3A interaction domain of TEL to AML-1 to transform AML-1 from a regulated to an unregulated transcriptional repressor. The recognition that AML-1 interacts with mSin3A to repress transcription suggested that the inv(16) fusion protein might also repress the transcription of AML-1-target genes. In fact, the inv(16) encodes a protein that cooperates with AML-1 to repress transcription. The inv(16) fusion protein was found in a ternary complex with AML-1 and mSin3A, suggesting that the inv(16) also acts by recruiting transcriptional corepressors and histone deacetylases.
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MESH Headings
- 3T3 Cells
- Animals
- COS Cells
- Chromosome Inversion
- Chromosomes, Human, Pair 12
- Chromosomes, Human, Pair 16
- Chromosomes, Human, Pair 18
- Chromosomes, Human, Pair 21
- Core Binding Factor Alpha 2 Subunit
- Humans
- Mice
- Nuclear Proteins/metabolism
- Nuclear Receptor Co-Repressor 1
- Oncogene Proteins, Fusion/genetics
- Oncogene Proteins, Fusion/metabolism
- Oncogene Proteins, Fusion/physiology
- RUNX1 Translocation Partner 1 Protein
- Repressor Proteins/genetics
- Repressor Proteins/metabolism
- Repressor Proteins/physiology
- Transcription Factors/genetics
- Transcription Factors/metabolism
- Transcription Factors/physiology
- Transcription, Genetic/physiology
- Translocation, Genetic
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Affiliation(s)
- S W Heibert
- Department of Biochemistry, Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN 37232, USA.
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18
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Strom DK, Nip J, Westendorf JJ, Linggi B, Lutterbach B, Downing JR, Lenny N, Hiebert SW. Expression of the AML-1 oncogene shortens the G(1) phase of the cell cycle. J Biol Chem 2000; 275:3438-45. [PMID: 10652337 DOI: 10.1074/jbc.275.5.3438] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.5] [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] [Indexed: 11/06/2022] Open
Abstract
The AML-1-encoded transcription factor, AML-1B, regulates numerous hematopoietic-specific genes. Inappropriate expression of AML-1-family proteins is oncogenic in cell culture systems and in mice. To understand the oncogenic functions of AML-1, we established cell lines expressing AML-1B to examine the role of AML-1 in the cell cycle. DNA content analysis and bromodeoxyuridine pulse-chase studies indicated that entry into the S phase of the cell cycle was accelerated by up to 4 h in AML-1B-expressing 32D.3 myeloid progenitor cells as compared with control cells or cells expressing E2F-1. However, AML-1B was not able to induce continued cell cycle progression in the absence of growth factors. The DNA binding and transactivation domains of AML-1B were required for altering the cell cycle. Thus, AML-1B is the first transcription factor that affects the timing of the mammalian cell cycle.
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Affiliation(s)
- D K Strom
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
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19
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Lutterbach B, Westendorf JJ, Linggi B, Isaac S, Seto E, Hiebert SW. A mechanism of repression by acute myeloid leukemia-1, the target of multiple chromosomal translocations in acute leukemia. J Biol Chem 2000; 275:651-6. [PMID: 10617663 DOI: 10.1074/jbc.275.1.651] [Citation(s) in RCA: 213] [Impact Index Per Article: 8.9] [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] [Indexed: 11/06/2022] Open
Abstract
AML1 is one of the most frequently translocated genes in human leukemia. Here we demonstrate that acute myeloid leukemia-1 (AML-1) (Runx-1) represses transcription from a native promoter, p21(Waf1/Cip1). Unexpectedly, this repression did not require interactions with the Groucho co-repressor. To define the mechanism of repression, we asked whether other co-repressors could interact with AML-1. We demonstrate that AML-1 interacts with the mSin3 co-repressors. Moreover, endogenous AML-1 associated with endogenous mSin3A in mammalian cells. A deletion mutant of AML-1 that did not interact with mSin3A failed to repress transcription. The AML-1/mSin3 association suggests a mechanism of repression for the chromosomal translocation fusion proteins that disrupt AML-1.
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Affiliation(s)
- B Lutterbach
- Departments of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
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20
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Lutterbach B, Westendorf JJ, Linggi B, Patten A, Moniwa M, Davie JR, Huynh KD, Bardwell VJ, Lavinsky RM, Rosenfeld MG, Glass C, Seto E, Hiebert SW. ETO, a target of t(8;21) in acute leukemia, interacts with the N-CoR and mSin3 corepressors. Mol Cell Biol 1998; 18:7176-84. [PMID: 9819404 PMCID: PMC109299 DOI: 10.1128/mcb.18.12.7176] [Citation(s) in RCA: 362] [Impact Index Per Article: 13.9] [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: 07/16/1998] [Accepted: 08/27/1998] [Indexed: 11/20/2022] Open
Abstract
t(8;21) is one of the most frequent translocations associated with acute myeloid leukemia. It produces a chimeric protein, acute myeloid leukemia-1 (AML-1)-eight-twenty-one (ETO), that contains the amino-terminal DNA binding domain of the AML-1 transcriptional regulator fused to nearly all of ETO. Here we demonstrate that ETO interacts with the nuclear receptor corepressor N-CoR, the mSin3 corepressors, and histone deacetylases. Endogenous ETO also cosediments on sucrose gradients with mSin3A, N-CoR, and histone deacetylases, suggesting that it is a component of one or more corepressor complexes. Deletion mutagenesis indicates that ETO interacts with mSin3A independently of its association with N-CoR. Single amino acid mutations that impair the ability of ETO to interact with the central portion of N-CoR affect the ability of the t(8;21) fusion protein to repress transcription. Finally, AML-1/ETO associates with histone deacetylase activity and a histone deacetylase inhibitor impairs the ability of the fusion protein to repress transcription. Thus, t(8;21) fuses a component of a corepressor complex to AML-1 to repress transcription.
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Affiliation(s)
- B Lutterbach
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
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