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Collier-Bain HD, Emery A, Causer AJ, Brown FF, Oliver R, Dutton D, Crowe J, Augustine D, Graby J, Leach S, Eddy R, Rothschild-Rodriguez D, Gray JC, Cragg MS, Cleary KL, Moore S, Murray J, Turner JE, Campbell JP. A single bout of vigorous intensity exercise enhances the efficacy of rituximab against human chronic lymphocytic leukaemia B-cells ex vivo. Brain Behav Immun 2024; 118:468-479. [PMID: 38503395 DOI: 10.1016/j.bbi.2024.03.023] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 02/15/2024] [Accepted: 03/16/2024] [Indexed: 03/21/2024] Open
Abstract
Chronic lymphocytic leukaemia (CLL) is characterised by the clonal proliferation and accumulation of mature B-cells and is often treated with rituximab, an anti-CD20 monoclonal antibody immunotherapy. Rituximab often fails to induce stringent disease eradication, due in part to failure of antibody-dependent cellular cytotoxicity (ADCC) which relies on natural killer (NK)-cells binding to rituximab-bound CD20 on B-cells. CLL cells are diffusely spread across lymphoid and other bodily tissues, and ADCC resistance in survival niches may be due to several factors including low NK-cell frequency and a suppressive stromal environment that promotes CLL cell survival. It is well established that exercise bouts induce a transient relocation of NK-cells and B-cells into peripheral blood, which could be harnessed to enhance the efficacy of rituximab in CLL by relocating both target and effector cells together with rituximab in blood. In this pilot study, n = 20 patients with treatment-naïve CLL completed a bout of cycling 15 % above anaerobic threshold for ∼ 30-minutes, with blood samples collected pre-, immediately post-, and 1-hour post-exercise. Flow cytometry revealed that exercise evoked a 254 % increase in effector (CD3-CD56+CD16+) NK-cells in blood, and a 67 % increase in CD5+CD19+CD20+ CLL cells in blood (all p < 0.005). NK-cells were isolated from blood samples pre-, and immediately post-exercise and incubated with primary isolated CLL cells with or without the presence of rituximab to determine specific lysis using a calcein-release assay. Rituximab-mediated cell lysis increased by 129 % following exercise (p < 0.001). Direct NK-cell lysis of CLL cells - independent of rituximab - was unchanged following exercise (p = 0.25). We conclude that exercise improved the efficacy of rituximab-mediated ADCC against autologous CLL cells ex vivo and propose that exercise should be explored as a means of enhancing clinical responses in patients receiving anti-CD20 immunotherapy.
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Affiliation(s)
| | | | - Adam J Causer
- Department for Health, University of Bath, United Kingdom
| | - Frankie F Brown
- Department for Health, University of Bath, United Kingdom; School of Applied Sciences, Edinburgh Napier University, Edinburgh, United Kingdom
| | - Rebecca Oliver
- Department for Health, University of Bath, United Kingdom; Department for Haematology, Royal United Hospitals Bath NHS Foundation Trust, United Kingdom
| | - David Dutton
- Department for Haematology, Great Western Hospitals NHS Foundation Trust, United Kingdom
| | - Josephine Crowe
- Department for Haematology, Royal United Hospitals Bath NHS Foundation Trust, United Kingdom
| | - Daniel Augustine
- Department of Cardiology, Royal United Hospitals Bath NHS Foundation Trust, United Kingdom
| | - John Graby
- Department for Health, University of Bath, United Kingdom; Department of Cardiology, Royal United Hospitals Bath NHS Foundation Trust, United Kingdom
| | - Shoji Leach
- Department for Health, University of Bath, United Kingdom
| | - Rachel Eddy
- Department for Health, University of Bath, United Kingdom
| | | | - Juliet C Gray
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton, United Kingdom
| | - Mark S Cragg
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton, United Kingdom
| | - Kirstie L Cleary
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton, United Kingdom
| | - Sally Moore
- Department for Haematology, Royal United Hospitals Bath NHS Foundation Trust, United Kingdom
| | - James Murray
- Department for Haematology, Royal United Hospitals Bath NHS Foundation Trust, United Kingdom
| | - James E Turner
- Department for Health, University of Bath, United Kingdom; School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom
| | - John P Campbell
- Department for Health, University of Bath, United Kingdom; School of Medical and Health Sciences, Edith Cowan University, Perth, Australia.
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2
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Wienke J, Visser LL, Kholosy WM, Keller KM, Barisa M, Poon E, Munnings-Tomes S, Himsworth C, Calton E, Rodriguez A, Bernardi R, van den Ham F, van Hooff SR, Matser YAH, Tas ML, Langenberg KPS, Lijnzaad P, Borst AL, Zappa E, Bergsma FJ, Strijker JGM, Verhoeven BM, Mei S, Kramdi A, Restuadi R, Sanchez-Bernabeu A, Cornel AM, Holstege FCP, Gray JC, Tytgat GAM, Scheijde-Vermeulen MA, Wijnen MHWA, Dierselhuis MP, Straathof K, Behjati S, Wu W, Heck AJR, Koster J, Nierkens S, Janoueix-Lerosey I, de Krijger RR, Baryawno N, Chesler L, Anderson J, Caron HN, Margaritis T, van Noesel MM, Molenaar JJ. Integrative analysis of neuroblastoma by single-cell RNA sequencing identifies the NECTIN2-TIGIT axis as a target for immunotherapy. Cancer Cell 2024; 42:283-300.e8. [PMID: 38181797 PMCID: PMC10864003 DOI: 10.1016/j.ccell.2023.12.008] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 11/10/2023] [Accepted: 12/11/2023] [Indexed: 01/07/2024]
Abstract
Pediatric patients with high-risk neuroblastoma have poor survival rates and urgently need more effective treatment options with less side effects. Since novel and improved immunotherapies may fill this need, we dissect the immunoregulatory interactions in neuroblastoma by single-cell RNA-sequencing of 24 tumors (10 pre- and 14 post-chemotherapy, including 5 pairs) to identify strategies for optimizing immunotherapy efficacy. Neuroblastomas are infiltrated by natural killer (NK), T and B cells, and immunosuppressive myeloid populations. NK cells show reduced cytotoxicity and T cells have a dysfunctional profile. Interaction analysis reveals a vast immunoregulatory network and identifies NECTIN2-TIGIT as a crucial immune checkpoint. Combined blockade of TIGIT and PD-L1 significantly reduces neuroblastoma growth, with complete responses (CR) in vivo. Moreover, addition of TIGIT+PD-L1 blockade to standard relapse treatment in a chemotherapy-resistant Th-ALKF1174L/MYCN 129/SvJ syngeneic model induces CR. In conclusion, our integrative analysis provides promising targets and a rationale for immunotherapeutic combination strategies.
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Affiliation(s)
- Judith Wienke
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands.
| | - Lindy L Visser
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | - Waleed M Kholosy
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | - Kaylee M Keller
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | - Marta Barisa
- Cancer Section, Developmental Biology and Cancer Programme, UCL Great Ormond Street Institute of Child Health, London, UK
| | - Evon Poon
- Division of Clinical Studies, The Institute of Cancer Research, London, UK
| | - Sophie Munnings-Tomes
- Cancer Section, Developmental Biology and Cancer Programme, UCL Great Ormond Street Institute of Child Health, London, UK
| | - Courtney Himsworth
- Cancer Section, Developmental Biology and Cancer Programme, UCL Great Ormond Street Institute of Child Health, London, UK
| | - Elizabeth Calton
- Division of Clinical Studies, The Institute of Cancer Research, London, UK
| | | | - Ronald Bernardi
- Genentech, A Member of the Roche Group, South San Francisco, CA, USA
| | - Femke van den Ham
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | | | - Yvette A H Matser
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | - Michelle L Tas
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | | | - Philip Lijnzaad
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | - Anne L Borst
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | - Elisa Zappa
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | | | | | - Bronte M Verhoeven
- Childhood Cancer Research Unit, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
| | - Shenglin Mei
- Department of Biomedical Informatics, Harvard Medical School, Boston, MA 02115, USA
| | - Amira Kramdi
- Institut Curie, Inserm U830, PSL Research University, Diversity and Plasticity of Childhood Tumors Lab, Paris, France; SIREDO: Care, Innovation and Research for Children, Adolescents and Young Adults with Cancer, Institut Curie, Paris, France
| | - Restuadi Restuadi
- Infection, Immunity and Inflammation Research and Teaching Department, UCL Great Ormond Street Institute of Child Health, London, UK; NIHR Biomedical Research Centre, Great Ormond Street Hospital, London, UK
| | - Alvaro Sanchez-Bernabeu
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, the Netherlands; Netherlands Proteomics Centre, Utrecht University, Utrecht, the Netherlands
| | - Annelisa M Cornel
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands; Center for Translational Immunology, University Medical Center Utrecht, Utrecht, the Netherlands
| | | | - Juliet C Gray
- Centre for Cancer Immunology, University of Southampton, Southampton, UK
| | | | | | - Marc H W A Wijnen
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands
| | | | - Karin Straathof
- University College London (UCL) Great Ormond Street Institute of Child Health, London, UK; UCL Cancer Institute, London, UK
| | - Sam Behjati
- Wellcome Sanger Institute, Hinxton, UK; Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK; Department of Paediatrics, University of Cambridge, Cambridge, UK
| | - Wei Wu
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, the Netherlands; Netherlands Proteomics Centre, Utrecht University, Utrecht, the Netherlands; Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (A∗STAR), Singapore, Singapore; Department of Pharmacy, National University of Singapore, Singapore, Singapore
| | - Albert J R Heck
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, the Netherlands; Netherlands Proteomics Centre, Utrecht University, Utrecht, the Netherlands
| | - Jan Koster
- Amsterdam UMC location University of Amsterdam, Center for Experimental and Molecular Medicine, Amsterdam, the Netherlands
| | - Stefan Nierkens
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands; Center for Translational Immunology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Isabelle Janoueix-Lerosey
- Institut Curie, Inserm U830, PSL Research University, Diversity and Plasticity of Childhood Tumors Lab, Paris, France; SIREDO: Care, Innovation and Research for Children, Adolescents and Young Adults with Cancer, Institut Curie, Paris, France
| | - Ronald R de Krijger
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands; Department of Pathology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Ninib Baryawno
- Childhood Cancer Research Unit, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
| | - Louis Chesler
- Division of Clinical Studies, The Institute of Cancer Research, London, UK
| | - John Anderson
- Cancer Section, Developmental Biology and Cancer Programme, UCL Great Ormond Street Institute of Child Health, London, UK; Department of Oncology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, England, UK
| | | | | | - Max M van Noesel
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands; Division Imaging & Cancer, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Jan J Molenaar
- Princess Máxima Center for Pediatric Oncology, Utrecht, the Netherlands; Department of Pharmaceutical Sciences, Utrecht University, Utrecht, the Netherlands
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Gao J, Fosbrook C, Gibson J, Underwood TJ, Gray JC, Walters ZS. Review: Targeting EZH2 in neuroblastoma. Cancer Treat Rev 2023; 119:102600. [PMID: 37467626 DOI: 10.1016/j.ctrv.2023.102600] [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] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 07/10/2023] [Accepted: 07/12/2023] [Indexed: 07/21/2023]
Abstract
Neuroblastoma is one of the commonest extra-cranial pediatric tumors, and accounts for over 15% of all childhood cancer mortality. Risk stratification for children with neuroblastoma is based on age, stage, histology, and tumor cytogenetics. The majority of patients are considered to have high-risk neuroblastoma, for which the long-term survival is less than 50%. Current treatments combine surgical resection, chemotherapy, stem cell transplantation, radiotherapy, anti-GD2 based immunotherapy as well as the differentiating agent isotretinoin. Despite the intensive multimodal therapies applied, there are high relapse rates, and recurrent disease is often resistant to further therapy. Enhancer of Zeste Homolog 2 (EZH2), a catalytic subunit of Polycomb Repressive Complex 2 (PRC2), is a histone methyltransferase that represses transcription through trimethylation of lysine residue K27 on histone H3 (H3K27me3). It is responsible for epigenetic repression of transcription, making EZH2 an essential regulator for cell differentiation. Overexpression of EZH2 has been shown to promote tumorigenesis, cancer cell proliferation and prevent tumor cells from differentiating in a number of cancers. Therefore, research has been ongoing for the past decade, developing treatments that target EZH2 in neuroblastoma. This review summarises the role of EZH2 in neuroblastoma and evaluates the latest research findings on the therapeutic potential of targeting EZH2 in the treatment of neuroblastoma.
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Affiliation(s)
- Jinhui Gao
- School of Cancer Sciences, Faculty of Medicine, University of Southampton, SO16 6YD, UK.
| | - Claire Fosbrook
- School of Cancer Sciences, Faculty of Medicine, University of Southampton, SO16 6YD, UK
| | - Jane Gibson
- School of Cancer Sciences, Faculty of Medicine, University of Southampton, SO16 6YD, UK
| | - Timothy J Underwood
- School of Cancer Sciences, Faculty of Medicine, University of Southampton, SO16 6YD, UK
| | - Juliet C Gray
- School of Cancer Sciences, Faculty of Medicine, University of Southampton, SO16 6YD, UK
| | - Zoë S Walters
- School of Cancer Sciences, Faculty of Medicine, University of Southampton, SO16 6YD, UK
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4
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Brown S, Chowdhury T, Collin M, Grundy RG, Howell L, Ramanujachar R, Rees H, Vora A, Gray JC, Bate J. National advisory panels for childhood cancer in the United Kingdom: An evaluation of current practice and a best practice statement for the future. Pediatr Blood Cancer 2023; 70:e30159. [PMID: 36565277 DOI: 10.1002/pbc.30159] [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] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 10/31/2022] [Accepted: 11/04/2022] [Indexed: 12/25/2022]
Abstract
BACKGROUND National advisory panels (NAPs) have been established for the care of children and young people (CYP) with cancer in the United Kingdom since 2011, with an increase in panel number in recent years. Their practice has not previously been reviewed; therefore, we sought to evaluate the role, practice and impact of six selected NAPs offering expertise in ependymoma, histiocytosis, leukaemia, neuroblastoma, renal tumours and sarcoma. PROCEDURE This service evaluation used mixed methodology, including review of NAP documentation, semi-structured interviews with the NAP chairs and an analysis of the cases referred for discussion. RESULTS Total 1110 referrals were analysed. Results demonstrated the significant scope and amount of work undertaken by the NAPs, largely testament to the commitment of the panel members. Specific roles fulfilled have been highlighted, and NAP recommendations have been shown to influence clinical decision-making and be implemented in the majority of cases. Despite widespread good practice, areas to address have been identified; these include clarity regarding NAP membership, consistency in recommendations, the consideration of holistic information to promote personalised management and the exploration of wider multidisciplinary team roles. CONCLUSIONS In the context of increasing demand and the escalating number of NAPs, it is timely to consider how service improvement can be facilitated. Best practice guidelines have been formulated as a product of this study, to promote a sustainable and effective model for NAPs. Review and benchmarking national panel performance against these guidelines will drive high standards of care going forward and they should be embedded as standard practice.
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Affiliation(s)
- Sarah Brown
- Department of Paediatric Oncology, Southampton Children's Hospital, Southampton, UK.,Cancer Sciences Unit, University of Southampton, Southampton, UK
| | - Tanzina Chowdhury
- Department of Paediatric Oncology, Great Ormond Street Hospital, London, UK
| | - Matthew Collin
- Department of Haematology, The Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle, UK
| | - Richard G Grundy
- Children's Brain Tumour Research Centre, Bio-Discovery Institute and Queen's Medical Centre, University Hospital Nottingham, Nottingham, UK
| | - Lisa Howell
- Department of Paediatric Oncology, Alder Hey Children's Hospital, Liverpool, UK
| | - Ramya Ramanujachar
- Department of Paediatric Oncology, Southampton Children's Hospital, Southampton, UK
| | - Helen Rees
- Department of Paediatric Oncology, University Hospitals Bristol and Weston NHS Foundation Trust, Bristol, UK
| | - Ajay Vora
- Department of Paediatric Haematology, Great Ormond Street Hospital, London, UK
| | - Juliet C Gray
- Department of Paediatric Oncology, Southampton Children's Hospital, Southampton, UK.,Cancer Sciences Unit, University of Southampton, Southampton, UK
| | - Jessica Bate
- Department of Paediatric Oncology, Southampton Children's Hospital, Southampton, UK
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Smith HL, Gray JC, Beers SA, Kanczler JM. Tri-Lineage Differentiation Potential of Osteosarcoma Cell Lines and Human Bone Marrow Stromal Cells from Different Anatomical Locations. Int J Mol Sci 2023; 24:ijms24043667. [PMID: 36835079 PMCID: PMC9960605 DOI: 10.3390/ijms24043667] [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] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 02/09/2023] [Indexed: 02/15/2023] Open
Abstract
The bone cancer osteosarcoma, found mainly in adolescents, routinely forms around the growth plate/metaphysis of long bones. Bone marrow composition changes with age, shifting from a more hematopoietic to an adipocyte-rich tissue. This conversion occurs in the metaphysis during adolescence, implicating a link between bone marrow conversion and osteosarcoma initiation. To assess this, the tri-lineage differentiation potential of human bone marrow stromal cells (HBMSCs) isolated from the femoral diaphysis/metaphysis (FD) and epiphysis (FE) was characterized and compared to two osteosarcoma cell lines, Saos-2 and MG63. Compared to FE-cells, FD-cells showed an increase in tri-lineage differentiation. Additionally, differences were found between the Saos-2 cells exhibiting higher levels of osteogenic differentiation, lower adipogenic differentiation, and a more developed chondrogenic phenotype than MG63, with the Saos-2 being more comparable to FD-derived HBMSCs. The differences found between the FD and FE derived cells are consistent with the FD region containing more hematopoietic tissue compared to the FE. This may be related to the similarities between FD-derived cells and Saos-2 cells during osteogenic and chondrogenic differentiation. These studies reveal distinct differences in the tri-lineage differentiations of 'hematopoietic' and 'adipocyte rich' bone marrow, which correlate with specific characteristics of the two osteosarcoma cell lines.
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Affiliation(s)
- Hannah L. Smith
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences Unit, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK
- Bone and Joint Research Group, Institute of Developmental Sciences, Human Development and Health, Faulty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK
| | - Juliet C. Gray
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences Unit, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK
| | - Stephen A. Beers
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences Unit, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK
| | - Janos M. Kanczler
- Bone and Joint Research Group, Institute of Developmental Sciences, Human Development and Health, Faulty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK
- Correspondence:
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Webb ER, Moreno-Vincente J, Easton A, Lanati S, Taylor M, James S, Williams EL, English V, Penfold C, Beers SA, Gray JC. Cyclophosphamide depletes tumor infiltrating T regulatory cells and combined with anti-PD-1 therapy improves survival in murine neuroblastoma. iScience 2022; 25:104995. [PMID: 36097618 PMCID: PMC9463572 DOI: 10.1016/j.isci.2022.104995] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 05/20/2022] [Accepted: 08/18/2022] [Indexed: 10/27/2022] Open
Abstract
The outcome for children with high-risk neuroblastoma is poor despite intensive multi-modal treatment protocols. Toxicity from current treatments is significant, and novel approaches are needed to improve outcome. Cyclophosphamide (CPM) is a key component of current chemotherapy regimens and is known to have immunomodulatory effects. However, this has not been investigated in the context of tumor infiltrating lymphocytes in neuroblastoma. Using murine models of neuroblastoma, the immunomodulatory effects of low-dose CPM were investigated using detailed immunophenotyping. We demonstrated that CPM resulted in a specific depletion of intratumoral T regulatory cells by apoptosis, and when combined with anti-PD-1 antibody therapy, this resulted in improved therapeutic efficacy. CPM combined with anti-PD-1 therapy was demonstrated to be an effective combinational therapy, with metronomic CPM found to be more effective than single dosing in more resistant tumor models. Overall, this pre-clinical data strongly support clinical evaluation of such combination strategies in neuroblastoma.
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Affiliation(s)
- Emily R. Webb
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Tremona Road, Southampton, Hampshire SO16 6YD, UK
| | - Julia Moreno-Vincente
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Tremona Road, Southampton, Hampshire SO16 6YD, UK
| | - Alistair Easton
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Tremona Road, Southampton, Hampshire SO16 6YD, UK
- Cellular Pathology, University Hospitals Southampton NHS Foundation Trust, Southampton SO16 6YD, UK
| | - Silvia Lanati
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Tremona Road, Southampton, Hampshire SO16 6YD, UK
| | - Martin Taylor
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Tremona Road, Southampton, Hampshire SO16 6YD, UK
| | - Sonya James
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Tremona Road, Southampton, Hampshire SO16 6YD, UK
| | - Emily L. Williams
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Tremona Road, Southampton, Hampshire SO16 6YD, UK
| | - Vikki English
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Tremona Road, Southampton, Hampshire SO16 6YD, UK
| | - Chris Penfold
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Tremona Road, Southampton, Hampshire SO16 6YD, UK
| | - Stephen A. Beers
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Tremona Road, Southampton, Hampshire SO16 6YD, UK
| | - Juliet C. Gray
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Tremona Road, Southampton, Hampshire SO16 6YD, UK
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7
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Izquierdo E, Carvalho DM, Mackay A, Temelso S, Boult JK, Pericoli G, Fernandez E, Das M, Molinari V, Grabovska Y, Rogers RF, Ajmone-Cat MA, Proszek PZ, Stubbs M, Depani S, O'Hare P, Yu L, Roumelioti G, Choudhary JS, Clarke M, Fairchild AR, Jacques TS, Grundy RG, Howell L, Picton S, Adamski J, Wilson S, Gray JC, Zebian B, Marshall LV, Carceller F, Grill J, Vinci M, Robinson SP, Hubank M, Hargrave D, Jones C. DIPG Harbors Alterations Targetable by MEK Inhibitors, with Acquired Resistance Mechanisms Overcome by Combinatorial Inhibition. Cancer Discov 2022; 12:712-729. [PMID: 34737188 PMCID: PMC7612484 DOI: 10.1158/2159-8290.cd-20-0930] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [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: 06/30/2020] [Revised: 09/04/2021] [Accepted: 10/19/2021] [Indexed: 11/16/2022]
Abstract
The survival of children with diffuse intrinsic pontine glioma (DIPG) remains dismal, with new treatments desperately needed. In a prospective biopsy-stratified clinical trial, we combined detailed molecular profiling and drug screening in newly established patient-derived models in vitro and in vivo. We identified in vitro sensitivity to MEK inhibitors in DIPGs harboring MAPK pathway alterations, but treatment of patient-derived xenograft models and a patient at relapse failed to elicit a significant response. We generated trametinib-resistant clones in a BRAFG469V model through continuous drug exposure and identified acquired mutations in MEK1/2 with sustained pathway upregulation. These cells showed hallmarks of mesenchymal transition and expression signatures overlapping with inherently trametinib-insensitive patient-derived cells, predicting sensitivity to dasatinib. Combined trametinib and dasatinib showed highly synergistic effects in vitro and on ex vivo brain slices. We highlight the MAPK pathway as a therapeutic target in DIPG and show the importance of parallel resistance modeling and combinatorial treatments for meaningful clinical translation. SIGNIFICANCE We report alterations in the MAPK pathway in DIPGs to confer initial sensitivity to targeted MEK inhibition. We further identify for the first time the mechanism of resistance to single-agent targeted therapy in these tumors and suggest a novel combinatorial treatment strategy to overcome it in the clinic. This article is highlighted in the In This Issue feature, p. 587.
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Affiliation(s)
- Elisa Izquierdo
- Division of Molecular Pathology, Institute of Cancer Research, London, United Kingdom
| | - Diana M. Carvalho
- Division of Molecular Pathology, Institute of Cancer Research, London, United Kingdom
| | - Alan Mackay
- Division of Molecular Pathology, Institute of Cancer Research, London, United Kingdom
| | - Sara Temelso
- Division of Molecular Pathology, Institute of Cancer Research, London, United Kingdom
| | - Jessica K.R. Boult
- Division of Radiotherapy and Imaging, The Institute of Cancer Research, London, United Kingdom
| | - Giulia Pericoli
- Department of Haematology/Oncology, Gene and Cell Therapy, Bambino Gesù Children's Hospital-IRCCS, Rome, Italy
| | - Elisabet Fernandez
- Division of Molecular Pathology, Institute of Cancer Research, London, United Kingdom
| | - Molina Das
- Division of Molecular Pathology, Institute of Cancer Research, London, United Kingdom
| | - Valeria Molinari
- Division of Molecular Pathology, Institute of Cancer Research, London, United Kingdom
| | - Yura Grabovska
- Division of Molecular Pathology, Institute of Cancer Research, London, United Kingdom
| | - Rebecca F. Rogers
- Division of Molecular Pathology, Institute of Cancer Research, London, United Kingdom
| | | | - Paula Z. Proszek
- Molecular Diagnostics, Royal Marsden Hospital NHS Trust, Sutton, United Kingdom
| | - Mark Stubbs
- Division of Cancer Therapeutics, Institute of Cancer Research, London, United Kingdom
| | - Sarita Depani
- Department of Haematology and Oncology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Patricia O'Hare
- Department of Haematology and Oncology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Lu Yu
- Division of Cancer Biology, Institute of Cancer Research, London, United Kingdom
| | - Georgia Roumelioti
- Division of Cancer Biology, Institute of Cancer Research, London, United Kingdom
| | - Jyoti S. Choudhary
- Division of Cancer Biology, Institute of Cancer Research, London, United Kingdom
| | - Matthew Clarke
- Division of Molecular Pathology, Institute of Cancer Research, London, United Kingdom
| | - Amy R. Fairchild
- UCL Great Ormond Street Institute for Child Health, London, United Kingdom
| | - Thomas S. Jacques
- UCL Great Ormond Street Institute for Child Health, London, United Kingdom
| | - Richard G. Grundy
- Children's Brain Tumour Research Centre, School of Medicine, University of Nottingham, Nottingham, United Kingdom
| | - Lisa Howell
- Alder Hey Children's NHS Foundation Trust, Liverpool, United Kingdom
| | - Susan Picton
- Leeds Children's Hospital, Leeds, United Kingdom
| | - Jenny Adamski
- Birmingham Women's and Children's Hospital, Birmingham, United Kingdom
| | - Shaun Wilson
- Oxford University Hospitals NHS Foundation Trust, Oxford, United Kingdom
| | - Juliet C. Gray
- Centre for Cancer Immunology, University of Southampton, Southampton, United Kingdom
| | - Bassel Zebian
- Department of Neurosurgery, Kings College Hospital NHS Trust, London, United Kingdom
| | - Lynley V. Marshall
- Division of Clinical Studies, The Institute of Cancer Research, London, United Kingdom
- Children & Young People's Unit, Royal Marsden Hospital NHS Trust, Sutton, United Kingdom
| | - Fernando Carceller
- Division of Clinical Studies, The Institute of Cancer Research, London, United Kingdom
- Children & Young People's Unit, Royal Marsden Hospital NHS Trust, Sutton, United Kingdom
| | - Jacques Grill
- Department of Pediatric and Adolescent Oncology and INSERM Unit U891, Team “Genomics and Oncogenesis of Pediatric Brain Tumors,” Gustave Roussy and University Paris-Saclay, Villejuif, France
| | - Maria Vinci
- Department of Haematology/Oncology, Gene and Cell Therapy, Bambino Gesù Children's Hospital-IRCCS, Rome, Italy
| | - Simon P. Robinson
- Division of Radiotherapy and Imaging, The Institute of Cancer Research, London, United Kingdom
| | - Michael Hubank
- Molecular Diagnostics, Royal Marsden Hospital NHS Trust, Sutton, United Kingdom
| | - Darren Hargrave
- Department of Haematology and Oncology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
- UCL Great Ormond Street Institute for Child Health, London, United Kingdom
| | - Chris Jones
- Division of Molecular Pathology, Institute of Cancer Research, London, United Kingdom
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8
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Moreno-Vicente J, Willoughby JE, Taylor MC, Booth SG, English VL, Williams EL, Penfold CA, Mockridge CI, Inzhelevskaya T, Kim J, Chan HTC, Cragg MS, Gray JC, Beers SA. Fc-null anti-PD-1 monoclonal antibodies deliver optimal checkpoint blockade in diverse immune environments. J Immunother Cancer 2022; 10:e003735. [PMID: 35017153 PMCID: PMC8753441 DOI: 10.1136/jitc-2021-003735] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [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: 12/08/2021] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Despite extensive clinical use, the mechanisms that lead to therapeutic resistance to anti-programmed cell-death (PD)-1 monoclonal antibodies (mAbs) remain elusive. Here, we sought to determine how interactions between the Fc region of anti-PD-1 mAbs and Fcγ receptors (FcγRs) affect therapeutic activity and how these are impacted by the immune environment. METHODS Mouse and human anti-PD-1 mAbs with different Fc binding profiles were generated and characterized in vitro. The ability of these mAbs to elicit T-cell responses in vivo was first assessed in a vaccination setting using the model antigen ovalbumin. The antitumor activity of anti-PD-1 mAbs was investigated in the context of immune 'hot' MC38 versus 'cold' neuroblastoma tumor models, and flow cytometry performed to assess immune infiltration. RESULTS Engagement of activating FcγRs by anti-PD-1 mAbs led to depletion of activated CD8 T cells in vitro and in vivo, abrogating therapeutic activity. Importantly, the extent of this Fc-mediated modulation was determined by the surrounding immune environment. Low FcγR-engaging mouse anti-PD-1 isotypes, which are frequently used as surrogates for human mAbs, were unable to expand ovalbumin-reactive CD8 T cells, in contrast to Fc-null mAbs. These results were recapitulated in mice expressing human FcγRs, in which clinically relevant hIgG4 anti-PD-1 led to reduced endogenous expansion of CD8 T cells compared with its engineered Fc-null counterpart. In the context of an immunologically 'hot' tumor however, both low-engaging and Fc-null mAbs induced long-term antitumor immunity in MC38-bearing mice. Finally, a similar anti-PD-1 isotype hierarchy was demonstrated in the less responsive 'cold' 9464D neuroblastoma model, where the most effective mAbs were able to delay tumor growth but could not induce long-term protection. CONCLUSIONS Our data collectively support a critical role for Fc:FcγR interactions in inhibiting immune responses to both mouse and human anti-PD-1 mAbs, and highlight the context-dependent effect that anti-PD-1 mAb isotypes can have on T-cell responses. We propose that engineering of Fc-null anti-PD-1 mAbs would prevent FcγR-mediated resistance in vivo and allow maximal T-cell stimulation independent of the immunological environment.
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Affiliation(s)
- Julia Moreno-Vicente
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
- Cancer Research UK Cambridge Institute, University of Cambridge, Cambridge, UK
| | - Jane E Willoughby
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
| | - Martin C Taylor
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
| | - Steven G Booth
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
| | - Vikki L English
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
| | - Emily L Williams
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
| | - Christine A Penfold
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
| | - C Ian Mockridge
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
| | - Tatyana Inzhelevskaya
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
| | - Jinny Kim
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
| | - H T Claude Chan
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
| | - Mark S Cragg
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
| | - Juliet C Gray
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
| | - Stephen A Beers
- Antibody and Vaccine Group, Centre for Cancer Immunology, Cancer Sciences, University of Southampton, Southampton, UK
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9
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Segura MF, Soriano A, Roma J, Piskareva O, Jiménez C, Boloix A, Fletcher JI, Haber M, Gray JC, Cerdá-Alberich L, Martínez de Las Heras B, Cañete A, Gallego S, Moreno L. Methodological advances in the discovery of novel neuroblastoma therapeutics. Expert Opin Drug Discov 2021; 17:167-179. [PMID: 34807782 DOI: 10.1080/17460441.2022.2002297] [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] [Indexed: 10/19/2022]
Abstract
INTRODUCTION Neuroblastoma is a cancer of the sympathetic nervous system that causes up to 15% of cancer-related deaths among children. Among the ~1,000 newly diagnosed cases per year in Europe, more than half are classified as high-risk, with a 5-year survival rate <50%. Current multimodal treatments have improved survival among these patients, but relapsed and refractory tumors remain a major therapeutic challenge. A number of new methodologies are paving the way for the development of more effective and safer therapies to ultimately improve outcomes for high-risk patients. AREAS COVERED The authors provide a critical review on methodological advances aimed at providing new therapeutic opportunities for neuroblastoma patients, including preclinical models of human disease, generation of omics data to discover new therapeutic targets, and artificial intelligence-based technologies to implement personalized treatments. EXPERT OPINION While survival of childhood cancer has improved over the past decades, progress has been uneven. Still, survival is dismal for some cancers, including high-risk neuroblastoma. Embracing new technologies (e.g. molecular profiling of tumors, 3D in vitro models, etc.), international collaborative efforts and the incorporation of new therapies (e.g. RNA-based therapies, epigenetic therapies, immunotherapy) will ultimately lead to more effective and safer therapies for these subgroups of neuroblastoma patients.
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Affiliation(s)
- Miguel F Segura
- Pediatric Oncology and Hematology Department, Translational Research in Child and Adolescent Cancer, Vall d'Hebron Institut de Recerca (VHIR), Barcelona. Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Aroa Soriano
- Pediatric Oncology and Hematology Department, Translational Research in Child and Adolescent Cancer, Vall d'Hebron Institut de Recerca (VHIR), Barcelona. Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Josep Roma
- Pediatric Oncology and Hematology Department, Translational Research in Child and Adolescent Cancer, Vall d'Hebron Institut de Recerca (VHIR), Barcelona. Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Olga Piskareva
- Cancer Bioengineering Group, Department of Anatomy and Regenerative Medicine, RCSI University of Medicine and Health Sciences, Dublin, Ireland.,Department of Anatomy and Regenerative Medicine, Advanced Materials and Bioengineering Research Centre (AMBER), RCSI and TCD, Dublin, Ireland.,National Children's Research Centre, OLCHC, Dublin, Ireland School of Pharmacy and Biomolecular Sciences, RCSI University of Medicine and Health Sciences, Dublin, Ireland
| | - Carlos Jiménez
- Pediatric Oncology and Hematology Department, Translational Research in Child and Adolescent Cancer, Vall d'Hebron Institut de Recerca (VHIR), Barcelona. Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Ariadna Boloix
- Pediatric Oncology and Hematology Department, Translational Research in Child and Adolescent Cancer, Vall d'Hebron Institut de Recerca (VHIR), Barcelona. Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Jamie I Fletcher
- Children's Cancer Institute Australia, Lowy Cancer Research Centre, UNSW Sydney, Kensington, Australia
| | - Michelle Haber
- Children's Cancer Institute Australia, Lowy Cancer Research Centre, UNSW Sydney, Kensington, Australia
| | - Juliet C Gray
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton, UK
| | - Leonor Cerdá-Alberich
- Grupo de Investigación Biomédica En Imagen, Instituto de Investigación Sanitaria La Fe, Spain
| | | | - Adela Cañete
- Unidad de Oncohematología Pediátrica, Hospital Universitario y Politécnico La Fe, Spain
| | - Soledad Gallego
- Pediatric Oncology and Hematology Department, Translational Research in Child and Adolescent Cancer, Vall d'Hebron Institut de Recerca (VHIR), Barcelona. Universitat Autònoma de Barcelona, Bellaterra, Spain.,Pediatric Oncology and Hematology Department, Vall d'Hebron University Hospital-UAB, Barcelona, Spain
| | - Lucas Moreno
- Pediatric Oncology and Hematology Department, Translational Research in Child and Adolescent Cancer, Vall d'Hebron Institut de Recerca (VHIR), Barcelona. Universitat Autònoma de Barcelona, Bellaterra, Spain.,Pediatric Oncology and Hematology Department, Vall d'Hebron University Hospital-UAB, Barcelona, Spain
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10
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Webb ER, Lanati S, Wareham C, Easton A, Dunn SN, Inzhelevskaya T, Sadler FM, James S, Ashton-Key M, Cragg MS, Beers SA, Gray JC. Immune characterization of pre-clinical murine models of neuroblastoma. Sci Rep 2020; 10:16695. [PMID: 33028899 PMCID: PMC7541480 DOI: 10.1038/s41598-020-73695-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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: 07/01/2020] [Accepted: 09/18/2020] [Indexed: 12/17/2022] Open
Abstract
Immunotherapy offers a potentially less toxic, more tumor-specific treatment for neuroblastoma than conventional cytotoxic therapies. Accurate and reproducible immune competent preclinical models are key to understanding mechanisms of action, interactions with other therapies and mechanisms of resistance to immunotherapy. Here we characterized the tumor and splenic microenvironment of two syngeneic subcutaneous (NXS2 and 9464D), and a spontaneous transgenic (TH-MYCN) murine model of neuroblastoma, comparing histological features and immune infiltrates to previously published data on human neuroblastoma. Histological sections of frozen tissues were stained by immunohistochemistry and immunofluorescence for immune cell markers and tumor architecture. Tissues were dissociated by enzymatic digestion, stained with panels of antibodies to detect and quantify cancer cells, along with lymphocytic and myeloid infiltration by flow cytometry. Finally, we tested TH-MYCN mice as a feasible model for immunotherapy, using prior treatment with cyclophosphamide to create a therapeutic window of minimal residual disease to favor host immune development. Immune infiltration differed significantly between all the models. TH-MYCN tumors were found to resemble immune infiltration in human tumors more closely than the subcutaneous models, alongside similar GD2 and MHC class I expression. Finally, TH-MYCN transgenic mice were administered cyclophosphamide alone or in combination with an anti-GD2 or anti-4-1BB monoclonal antibody, which resulted in increase in survival in both combination therapies. The TH-MYCN transgenic mouse is a promising in vivo model for testing immunotherapy compounds and combination therapy in a preclinical setting.
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Affiliation(s)
- Emily R Webb
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton General Hospital (MP127), Tremona Road, Southampton, Hampshire, SO16 6YD, UK.,Edinburgh Cancer Research Centre, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, EH4 2XU, UK
| | - Silvia Lanati
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton General Hospital (MP127), Tremona Road, Southampton, Hampshire, SO16 6YD, UK
| | - Carol Wareham
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton General Hospital (MP127), Tremona Road, Southampton, Hampshire, SO16 6YD, UK
| | - Alistair Easton
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton General Hospital (MP127), Tremona Road, Southampton, Hampshire, SO16 6YD, UK.,Cellular Pathology, University Hospitals Southampton NHS Foundation Trust, Southampton, SO16 6YD, UK.,Department of Oncology, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford, OX3 7DQ, UK
| | - Stuart N Dunn
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton General Hospital (MP127), Tremona Road, Southampton, Hampshire, SO16 6YD, UK
| | - Tatyana Inzhelevskaya
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton General Hospital (MP127), Tremona Road, Southampton, Hampshire, SO16 6YD, UK
| | - Freja M Sadler
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton General Hospital (MP127), Tremona Road, Southampton, Hampshire, SO16 6YD, UK
| | - Sonya James
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton General Hospital (MP127), Tremona Road, Southampton, Hampshire, SO16 6YD, UK
| | - Margaret Ashton-Key
- Cellular Pathology, University Hospitals Southampton NHS Foundation Trust, Southampton, SO16 6YD, UK
| | - Mark S Cragg
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton General Hospital (MP127), Tremona Road, Southampton, Hampshire, SO16 6YD, UK
| | - Stephen A Beers
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton General Hospital (MP127), Tremona Road, Southampton, Hampshire, SO16 6YD, UK
| | - Juliet C Gray
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton General Hospital (MP127), Tremona Road, Southampton, Hampshire, SO16 6YD, UK.
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11
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Bate J, Borrow R, Chisholm J, Clarke SC, Dixon E, Faust SN, Galanopoulou A, Goldblatt D, Heath PT, Maishman T, Mapstone S, Patel SR, Williams AP, Gray JC. Thirteen-Valent Pneumococcal Conjugate Vaccine in Children With Acute Lymphoblastic Leukemia: Protective Immunity Can Be Achieved on Completion of Treatment. Clin Infect Dis 2020; 71:1271-1280. [PMID: 31586206 DOI: 10.1093/cid/ciz965] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 05/07/2019] [Accepted: 10/02/2019] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Children with acute lymphoblastic leukemia (ALL) are at increased risk of developing invasive pneumococcal disease. This study describes the immunogenicity of 13-valent pneumococcal conjugate vaccine (PCV13) during and after chemotherapy. METHODS Children with ALL were allocated to study groups and received a single dose of PCV13: group 1, maintenance chemotherapy; group 2, end of chemotherapy; group 3, 6 months after chemotherapy. A protective vaccine response was defined as at least 10 of 12 serotypes (or >83% of serotypes with data) achieving postvaccination serotype-specific immunoglobulin G ≥0.35 µg/mL and ≥4-fold rise, compared to prevaccination at 1 and 12 months. RESULTS One hundred eighteen children were recruited. Only 12.8% (5/39; 95% confidence interval [CI], 4.3%-27.4%) of patients vaccinated during maintenance (group 1) achieved a protective response at 1 month postvaccination and none had a protective response at 12 months. For group 2 patients, 59.5% (22/37; 95% CI, 42.1%-75.3%) achieved a response at 1 month and 37.9% (11/29; 95% CI, 20.7%-57.7%) maintained immunity at 12 months. For group 3 patients, 56.8% (21/37; 95% CI, 39.5%-72.9%) achieved a protective response at 1 month and 43.3% (13/30; 95% CI, 25.5%-62.6%) maintained immunity at 12 months. CONCLUSIONS This study demonstrated that the earliest time point at which protective immunity can be achieved in children with ALL is on completion of chemotherapy. This is earlier than current recommendations and may improve protection during a period when children are most susceptible to infection. CLINICAL TRIALS REGISTRATION EudraCT 2009-011587-11.
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Affiliation(s)
- Jessica Bate
- University Hospital Southampton National Health Service Foundation Trust, Southampton, England, United Kingdom
| | - Ray Borrow
- Vaccine Evaluation Unit, Public Health England, Manchester Royal Infirmary, Manchester, England, United Kingdom
| | - Julia Chisholm
- Department of Paediatric Oncology, Royal Marsden Hospital, Sutton, Surrey, United Kingdom
| | - Stuart C Clarke
- Faculty of Medicine, University of Southampton, Southampton, England, United Kingdom
| | - Elizabeth Dixon
- Faculty of Medicine, University of Southampton, Southampton, England, United Kingdom
| | - Saul N Faust
- Faculty of Medicine, University of Southampton, Southampton, England, United Kingdom
- National Institute of Health Research Southampton Clinical Research Facility, National Institute of Health Research Southampton Biomedical Research Centre and Southampton National Institute of Health Research Cancer Research United Kingdom Experimental Cancer Medicine Centre, University Hospital Southampton National Health Service Foundation Trust, England, United Kingdom
| | - Angeliki Galanopoulou
- University of Southampton, Clinical Trials Unit, Southampton, England, United Kingdom
| | - David Goldblatt
- Great Ormond Street Institute of Child Health Biomedical Research Centre, University College London, London, England, United Kingdom
| | - Paul T Heath
- Paediatric Infectious Diseases Research Group & Vaccine Institute, St George's University of London and St George's University Hospitals National Health Service Trust, London, England, United Kingdom
| | - Tom Maishman
- University of Southampton, Clinical Trials Unit, Southampton, England, United Kingdom
| | - Susan Mapstone
- University of Southampton, Clinical Trials Unit, Southampton, England, United Kingdom
| | - Soonie R Patel
- Department of Paediatrics, Croydon University Hospital, Croydon, England, United Kingdom
| | - Antony P Williams
- Faculty of Medicine, University of Southampton, Southampton, England, United Kingdom
- National Institute of Health Research Southampton Clinical Research Facility, National Institute of Health Research Southampton Biomedical Research Centre and Southampton National Institute of Health Research Cancer Research United Kingdom Experimental Cancer Medicine Centre, University Hospital Southampton National Health Service Foundation Trust, England, United Kingdom
| | - Juliet C Gray
- University Hospital Southampton National Health Service Foundation Trust, Southampton, England, United Kingdom
- Faculty of Medicine, University of Southampton, Southampton, England, United Kingdom
- National Institute of Health Research Southampton Clinical Research Facility, National Institute of Health Research Southampton Biomedical Research Centre and Southampton National Institute of Health Research Cancer Research United Kingdom Experimental Cancer Medicine Centre, University Hospital Southampton National Health Service Foundation Trust, England, United Kingdom
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12
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Williams AP, Bate J, Brooks R, Chisholm J, Clarke SC, Dixon E, Faust SN, Galanopoulou A, Heath PT, Maishman T, Mapstone S, Patel SR, Vora A, Wilding SA, Gray JC. Immune reconstitution in children following chemotherapy for acute leukemia. EJHaem 2020; 1:142-151. [PMID: 35847713 PMCID: PMC9176016 DOI: 10.1002/jha2.27] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 05/15/2020] [Accepted: 05/20/2020] [Indexed: 11/09/2022]
Abstract
Although survival rates for pediatric acute lymphoblastic leukemia are now excellent, this is at the expense of prolonged chemotherapy regimens. We report the long-term immune effects in children treated according to the UK Medical Research Council UKALL 2003 protocol. Peripheral blood lymphocyte subsets and immunoglobulin levels were studied in 116 participants, at six time points, during and for 18-month following treatment, with 30-39 patients analyzed at each time point. Total lymphocytes were reduced during maintenance chemotherapy and remained low 18 months following treatment completion. CD4 T cells remained significantly reduced 18 months after treatment, but CD8 cells and natural killer cells recovered to normal values. The fall in naïve B-cell numbers during maintenance was most marked, but numbers recovered rapidly after cessation of treatment. Memory B cells, particularly nonclass-switched memory B cells, remained below normal levels 18 months following treatment. All immunoglobulin subclasses were reduced during treatment compared to normal values, with IgM levels most affected. This study demonstrates that immune reconstitution differs between lymphocyte compartments. Although total B-cell numbers recover rapidly, disruption of memory/naïve balance persists and T-cell compartment persist at 18 months. This highlights the impact of modern chemotherapy regimens on immunity, and thus, infectious susceptibility and response to immunization.
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Affiliation(s)
- Anthony P. Williams
- Faculty of Medicine and Institute for Life SciencesUniversity of SouthamptonSouthamptonUK
| | - Jessica Bate
- NIHR Southampton Clinical Research FacilityNIHR Southampton Biomedical Research Centre and Southampton NIHR CRUK Experimental Cancer Medicine CentreUniversity Hospital Southampton NHS Foundation TrustSouthamptonUK
| | - Rachael Brooks
- Faculty of Medicine and Institute for Life SciencesUniversity of SouthamptonSouthamptonUK
| | - Julia Chisholm
- Department of Paediatric OncologyRoyal Marsden HospitalSuttonSurrey
| | - Stuart C. Clarke
- Faculty of Medicine and Institute for Life SciencesUniversity of SouthamptonSouthamptonUK
| | | | - Saul N. Faust
- Faculty of Medicine and Institute for Life SciencesUniversity of SouthamptonSouthamptonUK
| | | | - Paul T. Heath
- Paediatric Infectious Diseases Research Group & Vaccine InstituteSt. George's University of London and St. Georges University Hospitals NHS TrustLondonUK
| | | | - Susan Mapstone
- NIHR Southampton Clinical Research FacilityNIHR Southampton Biomedical Research Centre and Southampton NIHR CRUK Experimental Cancer Medicine CentreUniversity Hospital Southampton NHS Foundation TrustSouthamptonUK
| | | | - Ajay Vora
- Department of Paediatric HaematologyGreat Ormond Street HospitalLondonUK
| | | | - Juliet C. Gray
- Faculty of Medicine and Institute for Life SciencesUniversity of SouthamptonSouthamptonUK
- NIHR Southampton Clinical Research FacilityNIHR Southampton Biomedical Research Centre and Southampton NIHR CRUK Experimental Cancer Medicine CentreUniversity Hospital Southampton NHS Foundation TrustSouthamptonUK
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13
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Moreno-Vicente J, Beers SA, Gray JC. PD-1/PD-L1 blockade in paediatric cancers: What does the future hold? Cancer Lett 2019; 457:74-85. [PMID: 31055109 DOI: 10.1016/j.canlet.2019.04.025] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [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: 02/01/2019] [Revised: 04/23/2019] [Accepted: 04/25/2019] [Indexed: 12/28/2022]
Abstract
Checkpoint blockade (CPB) immunotherapy has shown unprecedented success in a wide range of adult malignancies, and is increasingly being employed in the treatment of advanced cancers. However, the experience in the paediatric population remains limited and the small number of single agent studies reported have shown disappointing response rates. Paediatric cancers offer unique challenges that can hinder the translation of CPB into the paediatric clinic, and combinational therapies are likely to be needed to achieve therapeutic success. As the number of paediatric trials using CPB rapidly increases, understanding the challenges that these agents may encounter in this population is of special significance to allow the design of optimal combinatorial strategies for each tumour type. Here, we offer an overview of the unique biological and immunological features of paediatric cancers as compared to adult malignancies, and how these might impact the overall success of CPB in the paediatric population. We review the growing body of pre-clinical and clinical experiences to date, and discuss future strategies involving the combination of CPB with traditionally used therapies (chemotherapy and radiotherapy) or with other newly developed immunotherapies.
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Affiliation(s)
- Julia Moreno-Vicente
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Department of Paediatric Oncology, Southampton, Hants, SO16 6YD, UK
| | - Stephen A Beers
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Department of Paediatric Oncology, Southampton, Hants, SO16 6YD, UK
| | - Juliet C Gray
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Department of Paediatric Oncology, Southampton, Hants, SO16 6YD, UK.
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14
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Buchan SL, Dou L, Remer M, Booth SG, Dunn SN, Lai C, Semmrich M, Teige I, Mårtensson L, Penfold CA, Chan HTC, Willoughby JE, Mockridge CI, Dahal LN, Cleary KLS, James S, Rogel A, Kannisto P, Jernetz M, Williams EL, Healy E, Verbeek JS, Johnson PWM, Frendéus B, Cragg MS, Glennie MJ, Gray JC, Al-Shamkhani A, Beers SA. Antibodies to Costimulatory Receptor 4-1BB Enhance Anti-tumor Immunity via T Regulatory Cell Depletion and Promotion of CD8 T Cell Effector Function. Immunity 2018; 49:958-970.e7. [PMID: 30446386 DOI: 10.1016/j.immuni.2018.09.014] [Citation(s) in RCA: 96] [Impact Index Per Article: 16.0] [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: 08/14/2017] [Revised: 07/12/2018] [Accepted: 09/20/2018] [Indexed: 12/11/2022]
Abstract
The costimulatory receptor 4-1BB is expressed on activated immune cells, including activated T cells. Antibodies targeting 4-1BB enhance the proliferation and survival of antigen-stimulated T cells in vitro and promote CD8 T cell-dependent anti-tumor immunity in pre-clinical cancer models. We found that T regulatory (Treg) cells infiltrating human or murine tumors expressed high amounts of 4-1BB. Intra-tumoral Treg cells were preferentially depleted by anti-4-1BB mAbs in vivo. Anti-4-1BB mAbs also promoted effector T cell agonism to promote tumor rejection. These distinct mechanisms were competitive and dependent on antibody isotype and FcγR availability. Administration of anti-4-1BB IgG2a, which preferentially depletes Treg cells, followed by either agonistic anti-4-1BB IgG1 or anti-PD-1 mAb augmented anti-tumor responses in multiple solid tumor models. An antibody engineered to optimize both FcγR-dependent Treg cell depleting capacity and FcγR-independent agonism delivered enhanced anti-tumor therapy. These insights into the effector mechanisms of anti-4-1BB mAbs lay the groundwork for translation into the clinic.
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Affiliation(s)
- Sarah L Buchan
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Lang Dou
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Marcus Remer
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Steven G Booth
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Stuart N Dunn
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Chester Lai
- Department of Dermatopharmacology, University of Southampton, Faculty of Medicine, Southampton SO16 6YD, UK; Department of Dermatology, University Hospital Southampton NHS Foundation Trust, Southampton SO16 6YD, UK
| | - Monika Semmrich
- BioInvent International AB, Sölvegatan 41, 22370 Lund, Sweden
| | - Ingrid Teige
- BioInvent International AB, Sölvegatan 41, 22370 Lund, Sweden
| | | | - Christine A Penfold
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - H T Claude Chan
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Jane E Willoughby
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - C Ian Mockridge
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Lekh N Dahal
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Kirstie L S Cleary
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Sonya James
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Anne Rogel
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Päivi Kannisto
- Department of Obstetrics and Gynecology, Lund University Hospital, Lund, Sweden
| | - Mats Jernetz
- Department of Obstetrics and Gynecology, Lund University Hospital, Lund, Sweden
| | - Emily L Williams
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Eugene Healy
- Department of Dermatopharmacology, University of Southampton, Faculty of Medicine, Southampton SO16 6YD, UK; Department of Dermatology, University Hospital Southampton NHS Foundation Trust, Southampton SO16 6YD, UK
| | - J Sjef Verbeek
- Department of Human Genetics, Leiden University Medical Centre, Leiden, the Netherlands
| | - Peter W M Johnson
- Cancer Research UK Southampton Centre, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Björn Frendéus
- BioInvent International AB, Sölvegatan 41, 22370 Lund, Sweden
| | - Mark S Cragg
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Martin J Glennie
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK
| | - Juliet C Gray
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK.
| | - Aymen Al-Shamkhani
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK.
| | - Stephen A Beers
- Antibody and Vaccine Group, Centre for Cancer Immunology, University of Southampton Faculty of Medicine, Southampton SO16 6YD, UK.
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Brooks R, Lord C, Davies JH, Gray JC. Hypercalcaemia secondary to ectopic parathyroid hormone expression in an adolescent with metastatic alveolar rhabdomyosarcoma. Pediatr Blood Cancer 2018; 65. [PMID: 28843052 DOI: 10.1002/pbc.26778] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [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: 12/06/2016] [Revised: 07/27/2017] [Accepted: 07/31/2017] [Indexed: 11/06/2022]
Abstract
We report the case of a 14-year-old male with metastatic alveolar rhabdomyosarcoma, presenting with hypercalcaemia (3.89 mmol/l) and elevated parathyroid hormone (PTH) level (10.2 pmol/l). Imaging demonstrated extensive bony lytic damage, with "floating teeth" in the mandible. Normalisation of calcium levels and bony reformation of the mandible occurred following chemotherapy; PTH levels decreased initially but remained above normal levels. Imaging did not demonstrate any evidence of parathyroid abnormality. Tumour ectopic PTH secretion is a very rare cause of hypercalcaemia of malignancy in children. Hypercalcaemia with an elevated PTH, in the absence of parathyroid-related cause, should prompt investigation for underlying malignancy.
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Affiliation(s)
- Rachael Brooks
- Department of Paediatric Oncology, University Hospital Southampton Foundation Trust, Southampton, UK
| | - Christopher Lord
- Department of Paediatric Radiology, University Hospital Southampton Foundation Trust, Southampton, UK
| | - Justin H Davies
- Department of Paediatric Endocrinology, University Hospital Southampton Foundation Trust, Southampton, UK
| | - Juliet C Gray
- Department of Paediatric Oncology, University Hospital Southampton Foundation Trust, Southampton, UK.,Cancer Sciences Unit, University of Southampton, Southampton, UK
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Bidwell LC, McGeary JE, Gray JC, Palmer RHC, Knopik VS, MacKillop J. An initial investigation of associations between dopamine-linked genetic variation and smoking motives in African Americans. Pharmacol Biochem Behav 2015; 138:104-10. [PMID: 26410615 DOI: 10.1016/j.pbb.2015.09.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [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: 05/12/2015] [Revised: 08/05/2015] [Accepted: 09/24/2015] [Indexed: 11/25/2022]
Abstract
Nicotine dependence (ND) is a heterogeneous phenotype with complex genetic influences that may vary across ethnicities. The use of intermediate phenotypes may clarify genetic influences and reveal specific etiological pathways. Prior work in European Americans has found that the four Primary Dependence Motives (PDM) subscales (Automaticity, Craving, Loss of Control, and Tolerance) of the Wisconsin Inventory of Smoking Motives represent core features of nicotine dependence and are promising intermediate phenotypes for understanding genetic pathways to ND. However, no studies have examined PDM as an intermediate phenotype in African American smokers, an ethnic population that displays unique patterns of smoking and genetic variation. In the current study, 268 African American daily smokers completed a phenotypic assessment and provided a sample of DNA. Associations among haplotypes in the NCAM1-TTC12-ANKK1-DRD2 gene cluster, a dopamine-related gene region associated with ND, PDM intermediate phenotypes, and ND were examined. Dopamine-related genetic variation in the DBH and COMT genes was also considered on an exploratory basis. Mediational analysis was used to test the indirect pathway from genetic variation to smoking motives to nicotine dependence. NCAM1-TTC12-ANKK1-DRD2 region variation was significantly associated with the Automaticity subscale and, further, Automaticity significantly mediated associations among NCAM1-TTC12-ANKK1-DRD2 cluster variants and ND. DBH was also significantly associated with Automaticity, Craving, and Tolerance; Automaticity and Tolerance also served as mediators of the DBH-ND relationship. These results suggest that PDM, Automaticity in particular, may be a viable intermediate phenotype for understanding dopamine-related genetic influences on ND in African American smokers. Findings support a model in which putatively dopaminergic variants exert influence on ND through an effect on patterns of automatic routinized smoking.
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Affiliation(s)
- L C Bidwell
- Institute of Cognitive Science, University of Colorado at Boulder, Boulder, CO 80304, United States; Division of Behavioral Genetics, Rhode Island Hospital, 1 Hoppin St., Providence, RI 02903, United States; Department of Psychiatry and Human Behavior, Alpert Medical School, Brown University, Providence, RI 02903, United States.
| | - J E McGeary
- Providence Veterans Affairs Medical Center, 830 Chalkstone Avenue, Building 35, Providence, RI 02908, United States; Division of Behavioral Genetics, Rhode Island Hospital, 1 Hoppin St., Providence, RI 02903, United States; Department of Psychiatry and Human Behavior, Alpert Medical School, Brown University, Providence, RI 02903, United States
| | - J C Gray
- Department of Psychology, 100 Hooper St., University of Georgia, Athens, GA 30602, United States
| | - R H C Palmer
- Division of Behavioral Genetics, Rhode Island Hospital, 1 Hoppin St., Providence, RI 02903, United States; Department of Psychiatry and Human Behavior, Alpert Medical School, Brown University, Providence, RI 02903, United States
| | - V S Knopik
- Division of Behavioral Genetics, Rhode Island Hospital, 1 Hoppin St., Providence, RI 02903, United States; Department of Psychiatry and Human Behavior, Alpert Medical School, Brown University, Providence, RI 02903, United States
| | - J MacKillop
- Peter Boris Centre for Addictions Research, McMaster University/St. Joseph's Healthcare Hamilton, 100 West 5th At., Hamilton, ON L8N 3K7, Canada
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Chowdhury F, Dunn S, Mitchell S, Mellows T, Ashton-Key M, Gray JC. PD-L1 and CD8+PD1+ lymphocytes exist as targets in the pediatric tumor microenvironment for immunomodulatory therapy. Oncoimmunology 2015. [DOI: 10.1080/2162402x.2015.1029701] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- Ferdousi Chowdhury
- Cancer Sciences Unit; Faculty of Medicine; University of Southampton; Southampton, UK
| | - Stuart Dunn
- Cancer Sciences Unit; Faculty of Medicine; University of Southampton; Southampton, UK
| | - Simon Mitchell
- Cancer Sciences Unit; Faculty of Medicine; University of Southampton; Southampton, UK
| | - Toby Mellows
- Cellular Pathology; University Hospitals Southampton; Southampton, UK
| | - Margaret Ashton-Key
- Cancer Sciences Unit; Faculty of Medicine; University of Southampton; Southampton, UK
- Cellular Pathology; University Hospitals Southampton; Southampton, UK
| | - Juliet C Gray
- Cancer Sciences Unit; Faculty of Medicine; University of Southampton; Southampton, UK
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Hyde TP, Craddock HL, Gray JC, Pavitt SH, Hulme C, Godfrey M, Fernandez C, Navarro-Coy N, Dillon S, Wright J, Brown S, Dukanovic G, Brunton PA. A randomised controlled trial of complete denture impression materials. J Dent 2014; 42:895-901. [PMID: 24995473 PMCID: PMC4119301 DOI: 10.1016/j.jdent.2014.02.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Revised: 02/07/2014] [Accepted: 02/11/2014] [Indexed: 11/15/2022] Open
Abstract
Objectives There is continuing demand for non-implant prosthodontic treatment and yet there is a paucity of high quality Randomised Controlled Trial (RCT) evidence for best practice. The aim of this research was to provide evidence for best practice in prosthodontic impressions by comparing two impression materials in a double-blind, randomised, crossover, controlled, clinical trial. Methods Eighty-five patients were recruited, using published eligibility criteria, to the trial at Leeds Dental Institute, UK. Each patient received two sets of dentures; made using either alginate or silicone impressions. Randomisations determined the order of assessment and order of impressions. The primary outcome was patient blinded preference for unadjusted dentures. Secondary outcomes were patient preference for the adjusted dentures, rating of comfort, stability and chewing efficiency, experience of each impression, and an OHIP-EDENT questionnaire. Results Seventy-eight (91.8%) patients completed the primary assessment. 53(67.9%) patients preferred dentures made from silicone impressions while 14(17.9%) preferred alginate impressions. 4(5.1%) patients found both dentures equally satisfactory and 7 (9.0%) found both equally unsatisfactory. There was a 50% difference in preference rates (in favour of silicone) (95%CI 32.7–67.3%, p < 0.0001). Conclusion There is significant evidence that dentures made from silicone impressions were preferred by patients. Clinical significance Given the strength of the clinical findings within this paper, dentists should consider choosing silicone rather than alginate as their material of choice for secondary impressions for complete dentures. Trial Registration: ISRCTN 01528038.
This article forms part of a project for which the author (TPH) won the Senior Clinical Unilever Hatton Award of the International Assocation for Dental Research, Capetown, South Africa, June 2014.
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Affiliation(s)
- T P Hyde
- Leeds Dental Institute, University of Leeds, Leeds LS2 9LU, UK.
| | - H L Craddock
- University of Aberdeen Dental School, Cornhill Road, Aberdeen AB25 2ZR, UK
| | - J C Gray
- Clinical Trials Research Unit, Leeds Institute of Clinical Trials Research, University of Leeds, Leeds LS2 9JT, UK
| | - S H Pavitt
- Applied Health Research, Leeds Institute of Health Sciences, University of Leeds, Leeds LS2 9LJ, UK
| | - C Hulme
- Academic Unit of Health Economics, Leeds Institute of Health Sciences, University of Leeds, Leeds LS2 9LJ, UK
| | - M Godfrey
- Health and Social Care, Leeds Institute of Health Sciences, Leeds LS2 9LJ, UK
| | - C Fernandez
- Clinical Trials Research Unit, Leeds Institute of Clinical Trials Research, University of Leeds, Leeds LS2 9JT, UK
| | - N Navarro-Coy
- Leeds Institute of Clinical Trials Research, University of Leeds, Leeds LS2 9JT, UK
| | - S Dillon
- Leeds Dental Institute, University of Leeds, Leeds LS2 9LU, UK
| | - J Wright
- Leeds Institute of Clinical Trials Research, University of Leeds, Leeds LS2 9JT, UK
| | - S Brown
- Clinical Trials Research Unit, Leeds Institute of Clinical Trials Research, University of Leeds, Leeds LS2 9JT, UK
| | - G Dukanovic
- Dental Translational Clinical Research Unit (DenTCRU), Leeds Dental institute, University of Leeds, Leeds LS2 9LU, UK
| | - P A Brunton
- Leeds Dental Institute, University of Leeds, Leeds LS2 9LU, UK; Faculty of Dentistry, University of Otago, Dunedin, New Zealand
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Chowdhury F, Lode HN, Cragg MS, Glennie MJ, Gray JC. Development of immunomonitoring of antibody‑dependent cellular cytotoxicity against neuroblastoma cells using whole blood. Cancer Immunol Immunother 2014; 63:559-69. [PMID: 24658837 PMCID: PMC11029018 DOI: 10.1007/s00262-014-1534-y] [Citation(s) in RCA: 5] [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] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Accepted: 03/07/2014] [Indexed: 12/19/2022]
Abstract
Neuroblastoma, a childhood tumour of neuroectodermal origin, accounts for 15 % of paediatric cancer deaths, which is often metastatic at diagnosis and despite aggressive therapies, it has poor long-term prognosis with high risk of recurrence. Monoclonal antibody (mAb) therapy targeting GD2, a disialoganglioside expressed on neuroblastoma, has shown promise in recent trials with natural killer cell (NK)-mediated antibody-dependent cellular cytotoxicity (ADCC) thought to be central to efficacy, although other immune effectors may be important. To further enhance therapy, immunomonitoring of patients is essential to elucidate the in vivo mechanisms of action and provides surrogate end points of efficacy for future clinical trials. Our aim was to establish a 'real-time' ex vivo wholeblood (WB) immunomonitoring strategy to perform within the logistical constraints such as limited sample volumes, anticoagulant effects, sample stability and shipping time. A fluorescent dye release assay measuring target cell lysis was coupled with flow cytometry to monitor specific effector response. Significant target cell lysis with anti-GD2 antibody (p < 0.05) was abrogated following NK depletion. NK up-regulation of CD107a and CD69 positively correlated with target cell lysis (r > 0.6). The ADCC activity of WB correlated with peripheral blood mononuclear cells (r > 0.95), although WB showed overall greater target cell lysis attributed to the combination of NK-mediated ADCC, CD16+ granulocyte degranulation and complement- dependent cytotoxicity. Response was maintained in heparinised samples stored for 24 h at room temperature, but not 4 °C. Critically, the assay showed good reproducibility (mean % CV < 6.4) and was successfully applied to primary neuroblastoma samples. As such, WB provides a resourceful analysis of multiple mechanisms for efficient end point monitoring to correlate immune modulation with clinical outcome.
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Affiliation(s)
- Ferdousi Chowdhury
- Cancer Sciences Unit, Antibody and Vaccine Group, Faculty of Medicine, Southampton General Hospital, University of Southampton, Tremona Road, Southampton, SO16 6YD UK
| | - Holger N. Lode
- Department of Pediatric Oncology and Hematology, University of Greifswald, 17475 Greifswald, Germany
| | - Mark S. Cragg
- Cancer Sciences Unit, Antibody and Vaccine Group, Faculty of Medicine, Southampton General Hospital, University of Southampton, Tremona Road, Southampton, SO16 6YD UK
| | - Martin J. Glennie
- Cancer Sciences Unit, Antibody and Vaccine Group, Faculty of Medicine, Southampton General Hospital, University of Southampton, Tremona Road, Southampton, SO16 6YD UK
| | - Juliet C. Gray
- Cancer Sciences Unit, Antibody and Vaccine Group, Faculty of Medicine, Southampton General Hospital, University of Southampton, Tremona Road, Southampton, SO16 6YD UK
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Williams EL, Dunn SN, James S, Johnson PW, Cragg MS, Glennie MJ, Gray JC. Immunomodulatory monoclonal antibodies combined with peptide vaccination provide potent immunotherapy in an aggressive murine neuroblastoma model. Clin Cancer Res 2013; 19:3545-55. [PMID: 23649004 DOI: 10.1158/1078-0432.ccr-12-3226] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [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
PURPOSE Neuroblastoma is one of the commonest extracranial tumors of childhood. The majority of patients present with metastatic disease for which outcome remains poor. Immunotherapy is an attractive therapeutic approach for this disease, and a number of neuroblastoma tumor antigens have been identified. Here, we examine the therapeutic potential of combining immunomodulatory monoclonal antibodies (mAb) with peptide vaccination in murine neuroblastoma models. EXPERIMENTAL DESIGN Neuroblastoma-bearing mice were treated with mAb targeting 4-1BB, CD40, and CTLA-4 alone, or in combination with a peptide derived from the tumor antigen survivin (GWEDPPNDI). Survivin-specific immune response and therapeutic efficacy were assessed. RESULTS In the Neuro2a model, treatment of established tumor with anti-4-1BB, anti-CD40, or anti-CTLA-4 mAb results in tumor regression and long-term survival in 40% to 60% of mice. This is dependent on natural killer (NK) and CD8(+) T cells and is associated with tumor CD8(+) lymphocyte infiltrate. Successful therapy is achieved only if mAb is given to mice once tumors are established, suggesting dependence on sufficient tumor to provide antigen. In the more aggressive AgN2a and NXS2 models, single-agent mAb therapy provides ineffective therapy. However, if mAb (anti-CTLA-4) is given in conjunction with survivin peptide vaccination, then 60% long-term survival is achieved. This is associated with the generation of survivin-specific T-cell immunity, which again is only shown in the presence of tumor antigen. CONCLUSIONS These data suggest that the combination of antigen and costimulatory mAb may provide effective immunotherapy against neuroblastoma and may be of particular use in the minimal residual disease setting.
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Affiliation(s)
- Emily L Williams
- Antibody and Vaccine Group, Cancer Research UK Experimental Cancer Medicine Centre, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
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21
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Calton EA, Temple IK, Mackay DJ, Lever M, Ellard S, Flanagan SE, Davies JH, Hussain K, Gray JC. Hepatoblastoma in a child with a paternally-inherited ABCC8 mutation and mosaic paternal uniparental disomy 11p causing focal congenital hyperinsulinism. Eur J Med Genet 2013; 56:114-7. [DOI: 10.1016/j.ejmg.2012.12.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Accepted: 12/09/2012] [Indexed: 01/19/2023]
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Howe CJ, Auffret AD, Doherty A, Bowman CM, Dyer TA, Gray JC. Location and nucleotide sequence of the gene for the proton-translocating subunit of wheat chloroplast ATP synthase. Proc Natl Acad Sci U S A 2010; 79:6903-7. [PMID: 16593250 PMCID: PMC347242 DOI: 10.1073/pnas.79.22.6903] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The proton-translocating subunit of wheat chloroplast ATP synthase is encoded by a chloroplast gene that has been accurately mapped and whose nucleotide sequence has been determined. The predicted sequence of 81 amino acids has been confirmed in part by determination of the sequence of the first 40 amino acids from the NH(2) terminus of the protein, and it shows 100% homology with the known amino acid sequence of the spinach protein but no more than 35% homology with the amino acid sequences of bacterial and mitochondrial proteins. The gene shows no deviation from the "universal" genetic code and is not split. A potential ribosome binding site is located 12 nucleotides upstream from the initiation codon, but sequences homologous to prokaryotic promotors and transcription terminators are not apparent.
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Affiliation(s)
- C J Howe
- Botany School, University of Cambridge, Downing Street, Cambridge CB2 3EA. United Kingdom
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Abstract
Neuroblastoma is one of the commonest and most aggressive paediatric malignancies. The majority of children present with metastatic disease for which long-term survival remains poor despite intensive multi-modal therapies. Toxicity from current treatment regimes is already significant, and there is little room to further intensify therapy. Alternative treatment strategies are therefore needed in order to improve survival. Immunotherapy is an attractive therapeutic option for these children as it potentially offers a much more specific and less toxic treatment than conventional therapies. This review discusses the different immunotherapy strategies that may be useful in neuroblastoma, their advantages and disadvantages and the challenges that need to be overcome to successfully use them clinically.
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Affiliation(s)
- Juliet C Gray
- Cancer Sciences Division, University of Southampton, Southampton, UK.
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Abstract
BACKGROUND Studies have established that levels of fatigue vary between different patient groups. It is less clear whether the nature, as opposed to severity of fatigue differs between groups. OBJECTIVE To examine descriptions of fatigue by patients with a range of chronic diseases and determine the relationship between symptom domains. DESIGN Retrospective review of Fatigue Impact Scale (FIS) data. SETTING Fatigue Research Group. PARTICIPANTS Six hundred subjects in five chronic disease groups and one (n = 45) normal control group. MAIN OUTCOME MEASURES Statistical analysis was performed to assess the effect of increasing fatigue and the overlap of FIS domain scores between disease groups by calculation of geometric means as proportions summed to 1 in each FIS domains, whilst controlling for total score. RESULTS Those with lower scores exhibit relatively higher physical scores than patients with higher total scores. In contrast, as total score increases, so does the proportion accounted for by the cognitive and psychosocial scores. This was not related to a threshold effect as the maximum total score of 40 in the physical domain was only achieved in three patients (<1%). Average domain proportions between patient groups did not vary to any degree among physical (0.30-0.39), cognitive (0.15-0.23) and psychosocial (0.42-0.47) domain proportions of the patient groups. CONCLUSION Perceived fatigue is similar between patient groups. Increasing scores were not related to simply reaching the maximum threshold in the physical domain. Studies have confirmed a positive-structured approach to symptom management in one fatigue-associated chronic disease, primary biliary cirrhosis, leads to significant improvements in quality of life. We suggest that, with a similar approach, the same might be true in other chronic diseases where moderate fatigue is a significant problem.
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Affiliation(s)
- D E J Jones
- Institute of Cellular Medicine, Newcastle University, Newcastle, NE2 4HH, UK
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Parry SW, Chadwick T, Gray JC, Bexton RS, Tynan M, Bourke JP, Nath S. The intravenous adenosine test: a new test for the identification of bradycardia pacing indications? A pilot study in subjects with bradycardia pacing indications, vasovagal syncope and controls. QJM 2009; 102:461-8. [PMID: 19468041 DOI: 10.1093/qjmed/hcp048] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Intravenous adenosine has recently been used in the diagnosis of unexplained syncope, but there is no consensus as to the meaning of a 'positive' test. The objective is to determine the sensitivity and specificity of intravenous adenosine testing in the diagnosis of bradycardia-pacing indications [sinus node dysfunction(SND), atrio-ventricular block (AVB) and cardio-inhibitory carotid sinus syndrome (CSS)]. DESIGN Pilot cohort study. METHODS Patients-(i) Bradycardia-pacing group: Consecutive patients referred for pacing for SND, AVB and CSS; (ii) Consecutive head-up tilt (HUT)-positive VVS patients. Controls-(i) Simple controls (S-Con: normal examination/ECG) and (ii) Electrophysiology controls (EP-Con: consecutive subjects referred for accessory pathway ablation). Pacing referrals and EP-Con had electrophysiology studies to confirm referral diagnosis and exclude others. All subjects had bolus injection of 20 mg intravenous adenosine during continuous ECG and blood pressure monitoring (positive test: >or=6 s asystole, >or=10 s high-degree AVB post-injection). Sensitivity, specificity, safety and tolerability of the test were measured. RESULTS Of 264 potential participants (4 SND, 8 AVB, 7 CSS, 10 VVS, 10 EP-Con and 11 S-Con) 50 were studied. All (100%) of the bradycardia-pacing group were adenosine test-positive, as were 6 (60%) VVS. None (0%) and 3 (27%) of the EP- and S-Con groups were positive. Adenosine testing was 100% sensitive and 86% specific for bradycardia-pacing indications, and 100% specific using the diagnostically 'clean' EP-Con results. There were no significant adverse or side effects. CONCLUSION Adenosine testing reliably identified patients with definitive bradycardia-pacing indications in whom alternative diagnoses were excluded. Further work is needed to evaluate the role of this test in the diagnosis of unexplained syncope.
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Affiliation(s)
- S W Parry
- Falls and Syncope Service, Institute for Ageing and Health, Newcastle University, Royal Victoria Infirmary, Newcastle upon Tyne, UK.
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Gray JC, French RR, James S, Al-Shamkhani A, Johnson PW, Glennie MJ. Optimising anti-tumour CD8 T-cell responses using combinations of immunomodulatory antibodies. Eur J Immunol 2008; 38:2499-511. [PMID: 18792403 DOI: 10.1002/eji.200838208] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Immunostimulatory mAb as vaccine adjuvants for the treatment of cancer hold considerable potential for boosting weak responses when used against immunogenic tumours, or in combination with various other vaccines. We now show that when administered with OVA, the combination of anti-4-1BB mAb with anti-CD40, anti-OX40 or anti-CD25 resulted in a fourfold enhancement in the antigen-specific T-cell response compared with anti-4-1BB mAb alone, with a similar enhancement in memory responses following rechallenge with OVA. Although the number of antigen-specific T-cells generated after treatment with each of the combinations was similar, marked functional differences were detected. In particular, anti-4-1BB/anti-CD25 resulted in excellent expansion of specific CD8+ T cells but produced fewer IFN-gamma-secreting effector cells than the other combinations. Anti-4-1BB/anti-OX40 proved to be the most potent, inducing the most effective T-cell responses in the RIPmOVA diabetes model with adoptively transferred OVA-specific T cells, and, when given with a peptide vaccine, protecting mice against the poorly immunogenic B16-F10 tumour. Overall the results suggest that although these combinations of mAb look promising in terms of their therapeutic potential, further functional assays are needed to compare their effects.
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Affiliation(s)
- Juliet C Gray
- Tenovus Research Laboratory, Cancer Sciences Division, Southampton University School of Medicine, Tremona Road, Southampton, UK
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Abstract
The aim of cancer immunotherapy is to employ the specificity of the immune system to provide a more effective, less toxic, treatment compared with conventional therapies. Although many strategies have been used to try to generate effective anticancer immune responses, very few have reached mainstream clinical use. A new approach introduced over the last few years is to use immunostimulatory mAbs (monoclonal antibodies) to boost weak endogenous antitumour immune responses to levels which are therapeutic. Such agonistic or antagonistic mAbs bind to key receptors in the immune system acting to enhance antigen presentation, provide co-stimulation or to counteract immunoregulation. In animal models, this approach has been shown to promote powerful tumour-specific T-cell responses capable of clearing established tumour and leaving the animal with long-term immunity. In addition to this impressive therapy seen in tumour models, these same mAbs also have the potential to be therapeutically useful in autoimmune and infectious diseases. This review discusses the use of these mAbs as therapeutic agents, their advantages and disadvantages and the challenges that need to be overcome to use them clinically.
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Affiliation(s)
- Juliet C Gray
- Cancer Research UK Medical Oncology Unit, The Cancer Sciences Division, Southampton University School of Medicine, General Hospital, Southampton SO16 6YD, UK.
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French RR, Taraban VY, Crowther GR, Rowley TF, Gray JC, Johnson PW, Tutt AL, Al-Shamkhani A, Glennie MJ. Eradication of lymphoma by CD8 T cells following anti-CD40 monoclonal antibody therapy is critically dependent on CD27 costimulation. Blood 2007; 109:4810-5. [PMID: 17311995 DOI: 10.1182/blood-2006-11-057216] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Growing evidence points to the potential of agonistic anti-CD40 mAbs as adjuvants for vaccination against cancer. These appear to act by maturing dendritic cells (DCs) and allowing them to prime CD8 cytotoxic T lymphocytes (CTLs). Although it is well established that optimal T-cell priming requires costimulation via B7:CD28, recent studies emphasize the contribution of TNF receptors to this process. To understand how anti-CD40 mAbs trigger effective antitumor immunity, we investigated the role of TNFR superfamily members CD27 and 4-1BB in the generation of this immunity and showed that, although partially dependent on 4-1BB:4-1BBL engagement, it is completely reliant on CD27:CD70 interactions. Importantly, blocking CD70, and to some extent 4-1BBL, during anti-CD40 treatment prevented accumulation of tumor-reactive T cells and subsequent tumor protection. However, it did not influence changes in DC number, phenotype, nor the activity of CTLs once immunity was established. We conclude that CD27:CD70 and 4-1BB:4-1BBL interactions are needed for DC-driven accumulation of antitumor CTLs following anti-CD40 mAb treatment. Finally, in support of the critical role for CD70:CD27, we show for the first time that agonistic anti-CD27 mAbs given without a DC maturation signal completely protect tumor-bearing mice and provide a highly potent reagent for boosting antitumor T-cell immunity.
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Affiliation(s)
- Ruth R French
- Cancer Sciences Division, School of Medicine, Tenovus Research Laboratory, University of Southampton, Tremona Road, Southampton, UK
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29
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Sutton AGC, Campbell PG, Graham R, Price DJA, Gray JC, Grech ED, Hall JA, Harcombe AA, Wright RA, Smith RH, Murphy JJ, Shyam-Sundar A, Stewart MJ, Davies A, Linker NJ, de Belder MA. One year results of the Middlesbrough early revascularisation to limit infarction (MERLIN) trial. Heart 2005; 91:1330-7. [PMID: 16162629 PMCID: PMC1769146 DOI: 10.1136/hrt.2004.047753] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
OBJECTIVE To report one year results of the MERLIN (Middlesbrough early revascularisation to limit infarction) trial, a prospective randomised trial comparing the strategy of coronary angiography and urgent revascularisation with conservative treatment in patients with failed fibrinolysis complicating ST segment elevation myocardial infarction (STEMI). The 30 day results have recently been published. At the planning stage of the trial, it was determined that follow up of trial patients would continue annually to three years to determine whether late benefit occurred. SUBJECTS 307 patients who received a fibrinolytic for STEMI but failed to reperfuse early according to previously described ECG criteria and did not develop cardiogenic shock. METHODS Patients were randomly assigned to receive either emergency coronary angiography with a view to proceeding to urgent revascularisation (rescue percutaneous coronary intervention (rPCI) arm) or continued medical treatment (conservative arm). The primary end point was all cause mortality at 30 days. The secondary end points included the composite end point of death, reinfarction, stroke, unplanned revascularisation, or heart failure at 30 days. The same end points were evaluated at one year and these results are presented. RESULTS All cause mortality at one year was similar in the conservative arm and the rPCI arm (13.0% v 14.4%, p = 0.7, risk difference (RD) -1.4%, 95% confidence interval (CI) -9.3 to 6.4). The incidence of the composite secondary end point of death, reinfarction, stroke, unplanned revascularisation, or heart failure was significantly higher in the conservative arm (57.8% v 43.1%, p = 0.01, RD 14.7%, 95% CI 3.5% to 25.5%). This was driven almost exclusively by a significantly higher incidence of subsequent unplanned revascularisation in the conservative arm (29.9% v 12.4%, p < 0.001, RD 17.5%, 95% CI 8.5% to 26.4%). Reinfarction and clinical heart failure were numerically, but not statistically, more common in the conservative arm (14.3% v 10.5%, p = 0.3, RD 3.8%, 95% CI -3.7 to 11.4, and 31.2% v 26.1%, p = 0.3, RD 5.0%, 95% CI -5.1 to 15.1). There was a strong trend towards fewer strokes in the conservative arm (1.3% v 5.2%, p = 0.06, RD -3.9%, 95% CI -8.9 to 0.06). CONCLUSION At one year of follow up, there was no survival advantage in the rPCI arm compared with the conservative arm. The incidence of the composite secondary end point was significantly lower in the rPCI arm, but this was driven almost entirely by a highly significant reduction in the incidence of further revascularisation.
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Affiliation(s)
- A G C Sutton
- The James Cook University Hospital, Middlesbrough TS4 3BW, UK.
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30
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Helliwell CA, Sullivan JA, Mould RM, Gray JC, Peacock WJ, Dennis ES. A plastid envelope location of Arabidopsis ent-kaurene oxidase links the plastid and endoplasmic reticulum steps of the gibberellin biosynthesis pathway. Plant J 2001; 28:201-8. [PMID: 11722763 DOI: 10.1046/j.1365-313x.2001.01150.x] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We have used fusions of gibberellin biosynthesis enzymes to green fluorescent protein (GFP) to determine the subcellular localization of the early steps of the pathway. Gibberellin biosynthesis from geranylgeranyl diphosphate is catalysed by enzymes of the terpene cyclase, cytochrome P450 mono-oxygenase and 2-oxoglutarate-dependent dioxygenase classes. We show that the N-terminal pre-sequences of the Arabidopsis thaliana terpene cyclases copalyl diphosphate synthase (AtCPS1) and ent-kaurene synthase (AtKS1) direct GFP to chloroplasts in transient assays following microprojectile bombardment of tobacco leaves. The AtKS1-GFP fusion is also imported by isolated pea chloroplasts. The N-terminal portion of the cytochrome P450 protein ent-kaurene oxidase (AtKO1) directs GFP to chloroplasts in tobacco leaf transient assays. Chloroplast import assays with 35S-labelled AtKO1 protein show that it is targeted to the outer face of the chloroplast envelope. The leader sequences of the two ent-kaurenoic acid oxidases (AtKAO1 and AtKAO2) from Arabidopsis direct GFP to the endoplasmic reticulum. These data suggest that the AtKO1 protein links the plastid- and endoplasmic reticulum-located steps of the gibberellin biosynthesis pathway by association with the outer envelope of the plastid.
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Affiliation(s)
- C A Helliwell
- CSIRO Plant Industry, GPO Box 1600, ACT 2601, Australia.
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31
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Drea SC, Mould RM, Hibberd JM, Gray JC, Kavanagh TA. Tissue-specific and developmental-specific expression of an Arabidopsis thaliana gene encoding the lipoamide dehydrogenase component of the plastid pyruvate dehydrogenase complex. Plant Mol Biol 2001; 46:705-15. [PMID: 11575725 DOI: 10.1023/a:1011612921144] [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] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We describe an Arabidopsis thaliana gene, ptlpd2, which codes for a protein with high amino acid similarity to lipoamide dehydrogenases (LPDs) from diverse species. Ptlpd2 codes for a precursor protein possessing an N-terminal extension predicted to be a plastid-targeting signal. Expression of the ptlpd2 cDNA in Escherichia coli showed the encoded protein possessed the predicted LPD activity. PTLPD2 protein, synthesized in vitro, was efficiently imported into isolated chloroplasts of Pisum sativum and shown to be located in the stroma. In addition, fusion proteins containing the predicted transit peptide of PTLPD2 or the entire protein fused at the N-terminus with the green fluorescent protein (GFP), showed accumulation in vivo in chloroplasts but not in mitochondria of A. thaliana. Expression of ptlpd2 was investigated by introducing ptlpd2 promoter-beta-glucuronidase (GUS) gene fusions into Nicotiana tabacum. GUS expression was observed in seeds, flowers, root tips and young leaves. GUS activity was highest in mature seeds, decreased on germination and increased again in young leaves. Expression was also found to be temporally regulated in pollen grains where it was highest in mature grains at dehiscence. Database searches on ptlpd2 sequences identified a second A. thaliana gene encoding a putative plastidial LPD and two genes encoding proteins with high similarity to the mitochondrial LPD of P. sativum.
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Affiliation(s)
- S C Drea
- Department of Genetics, Trinity College, Dublin, Ireland
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32
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Abstract
Arabidopsis cDNAs encoding ATJ11, the smallest known J-domain protein, have been isolated and characterized. The precursor protein of 161 amino acid residues was synthesized in vitro and imported by isolated pea chloroplasts where it was localized to the stroma and cleaved to a mature protein of 125 amino acid residues. The mature protein consists of an 80 amino acid J-domain, and N- and C-terminal extensions of 24 and 21 amino acid residues, respectively, which show no similarity to regions in other DnaJ-related proteins. ATJ11 produced in Escherichia coli stimulated the weak ATPase activity of E. coli DnaK, but was unable to stimulate refolding of firefly luciferase by DnaK, and inhibited refolding by DnaK, DnaJ and GrpE. ATJ11 is encoded by a single-copy gene on chromosome 4, and is expressed in all plant organs examined. A paralogue of ATJ11, showing 72% identity, is encoded in a 4.5 Mb duplication of chromosome 4 on chromosome 2. These proteins represent a novel class of J-domain proteins.
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MESH Headings
- Adenosine Triphosphatases/drug effects
- Adenosine Triphosphatases/metabolism
- Amino Acid Sequence
- Arabidopsis/genetics
- Arabidopsis/metabolism
- Arabidopsis Proteins
- Binding Sites
- Biological Transport
- Blotting, Northern
- Blotting, Southern
- Chloroplasts/metabolism
- Chromosome Mapping
- DNA, Complementary/chemistry
- DNA, Complementary/genetics
- DNA, Complementary/isolation & purification
- DNA, Plant/genetics
- Escherichia coli Proteins
- HSP70 Heat-Shock Proteins/drug effects
- HSP70 Heat-Shock Proteins/metabolism
- Luciferases/chemistry
- Luciferases/drug effects
- Metalloendopeptidases/metabolism
- Molecular Chaperones/genetics
- Molecular Chaperones/metabolism
- Molecular Sequence Data
- Pisum sativum/metabolism
- Plant Proteins/genetics
- Plant Proteins/metabolism
- Plant Proteins/pharmacology
- Plastids/metabolism
- Protein Denaturation
- Protein Folding
- Protein Precursors/metabolism
- RNA, Plant/genetics
- RNA, Plant/metabolism
- Sequence Alignment
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Species Specificity
- Tissue Distribution
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Affiliation(s)
- W Orme
- Department of Plant Sciences and Cambridge Centre for Molecular Recognition, University of Cambridge, UK
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33
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Reynolds NJ, Franklin V, Gray JC, Diffey BL, Farr PM. Narrow-band ultraviolet B and broad-band ultraviolet A phototherapy in adult atopic eczema: a randomised controlled trial. Lancet 2001; 357:2012-6. [PMID: 11438134 DOI: 10.1016/s0140-6736(00)05114-x] [Citation(s) in RCA: 157] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
BACKGROUND Narrow-band ultraviolet B (UVB) is an effective treatment for psoriasis, and open studies suggest that this phototherapy might improve atopic eczema. We did a randomised controlled trial to compare narrow-band UVB, UVA, and visible light phototherapy as second-line, adjunctive treatments in adult patients with moderate to severe atopic eczema. METHODS Phototherapy was administered twice a week for 12 weeks. 26 patients were randomly assigned narrow-band UVB, 24 were assigned UVA, and 23 visible fluorescent light. The primary endpoints were change in total disease activity (sum of scores at six body sites) and change in extent of disease after 24 treatments compared with baseline. Data were analysed by the method of summary measures. FINDINGS 13 patients withdrew or were excluded from analysis. Mean reductions in total disease activity over 24 treatments in patients who received narrow-band UVB and UVA, respectively, were 9.4 points (95% CI 3.6 to 15.2) and 4.4 points (-1.0 to 9.8) more than in patients who received visible light. Mean reductions in extent of disease after 24 treatments with narrow-band UVB and UVA were 6.7% (1.5 to 11.9) and -1.0% (-5.3 to 3.3) compared with visible light. A small proportion of patients developed erythema after phototherapy or had a flare in their eczema sufficient to withdraw from treatment. INTERPRETATION Narrow-band UVB is an effective adjunctive treatment for moderate to severe atopic eczema, and the treatment is well tolerated by most patients.
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Affiliation(s)
- N J Reynolds
- Department of Dermatology Medical School, Framlington Place, University of Newcastle upon Tyne, NE2 4HH, UK.
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34
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Baena-Gonzalez E, Gray JC, Tyystjarvi E, Aro EM, Maenpaa P. Abnormal regulation of photosynthetic electron transport in a chloroplast ycf9 inactivation mutant. J Biol Chem 2001; 276:20795-802. [PMID: 11259438 DOI: 10.1074/jbc.m101255200] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [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: 11/06/2022] Open
Abstract
The ycf9 (orf62) gene of the plastid genome encodes a 6.6-kDa protein (ORF62) of thylakoid membranes. To elucidate the role of the ORF62 protein, the coding region of the gene was disrupted with an aadA cassette, yielding mutant plants that were nearly (more than 95%) homoplasmic for ycf9 inactivation. The ycf9 mutant had no altered phenotype under standard growth conditions, but its growth rate was severely reduced under suboptimal irradiances. On the other hand, it was less susceptible to photodamage than the wild type. ycf9 inactivation resulted in a clear reduction in protein amounts of CP26, the NAD(P)H dehydrogenase complex, and the plastid terminal oxidase. Furthermore, depletion of ORF62 led to a faster flow of electrons to photosystem I without a change in the maximum electron transfer capacity of photosystem II. Despite the reduction of CP26 in the mutant thylakoids, no differences in PSII oxygen evolution rates were evident even at low light intensities. On the other hand, the ycf9 mutant presented deficiencies in the capacity for PSII-independent electron transport (ferredoxin-dependent cyclic electron transport and NAD(P)H dehydrogenase-mediated plastoquinone reduction). Altogether, it is shown that depletion of ORF62 leads to anomalies in the photosynthetic electron transfer chain and in the regulation of electron partitioning among the different routes of electron transport.
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Affiliation(s)
- E Baena-Gonzalez
- Department of Biology, Plant Physiology and Molecular Biology, University of Turku, FIN-20014 Turku, Finland
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35
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Abstract
High-mobility-group proteins HMG-1 and HMG-I/Y bind at overlapping sites within the A/T-rich enhancer element of the pea plastocyanin gene. Competition binding experiments revealed that HMG-1 enhanced the binding of HMG-I/Y to a 31-bp region (P31) of the enhancer. Circularization assays showed that HMG-1, but not HMG-I/Y, was able to bend a linear 100-bp DNA containing P31 so that the ends could be ligated. HMG-1, but not HMG-I/Y, showed preferential binding to the circular 100-bp DNA compared with the equivalent linear DNA, indicating that alteration of the conformation of the DNA by HMG-1 was not responsible for enhanced binding of HMG-I/Y. Direct interaction of HMG-I/Y and HMG-1 in the absence of DNA was demonstrated by binding of 35S-labeled proteins to immobilized histidine-tagged proteins, and this was due to an interaction of the N-terminal HMG-box-containing region of HMG-1 and the C-terminal AT-hook region of HMG-I/Y. Kinetic analysis using the IAsys biosensor revealed that HMG-1 had an affinity for immobilized HMG-I/Y (Kd = 28 nM) similar to that for immobilized P31 DNA. HMG-1-enhanced binding of HMG-I/Y to the enhancer element appears to be mediated by the formation of an HMG-1-HMG-I/Y complex, which binds to DNA with the rapid loss of HMG-1.
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Affiliation(s)
- C I Webster
- Cambridge Centre for Molecular Recognition and Department of Plant Sciences, University of Cambridge, UK
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36
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Chua YL, Brown AP, Gray JC. Targeted histone acetylation and altered nuclease accessibility over short regions of the pea plastocyanin gene. Plant Cell 2001; 13:599-612. [PMID: 11251099 PMCID: PMC135505 DOI: 10.1105/tpc.13.3.599] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2000] [Accepted: 01/09/2001] [Indexed: 05/17/2023]
Abstract
The chromatin structure of the pea plastocyanin gene (PetE) was examined at three different transcriptional states by investigating the acetylation states of histones H3 and H4 and the nuclease accessibility of the gene in pea roots, etiolated shoots, and green shoots. The acetylation states of histones associated with different regions of PetE were analyzed by chromatin immunoprecipitation with antibodies specific for acetylated or nonacetylated histone H3 or H4 tails, followed by polymerase chain reaction quantification. Comparison of pea tissues indicated that histone hyperacetylation was associated with increased PetE transcription in green shoots. Moreover, hyperacetylation of both histones H3 and H4 was targeted to the enhancer/promoter region in green shoots, suggesting that only specific nucleosomes along the gene were modified. Time-course digestions of nuclei with micrococcal nuclease and DNaseI indicated that the enhancer/promoter region was more resistant to digestion in the inactive gene in pea roots than was the same region in the active gene in shoots, whereas the transcribed region of PetE was digested similarly among the tissues. This finding indicates that transcription is accompanied by changes in the nuclease accessibility of the enhancer/promoter region only. Moreover, these results indicate that the changes in nuclease accessibility are organ specific, whereas histone hyperacetylation is light dependent, and they suggest that changes in nuclease accessibility precede histone hyperacetylation during PetE activation.
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Affiliation(s)
- Y L Chua
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, United Kingdom
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37
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Chua YL, Brown AP, Gray JC. Targeted histone acetylation and altered nuclease accessibility over short regions of the pea plastocyanin gene. Plant Cell 2001; 13:599-612. [PMID: 11251099 DOI: 10.2307/3871409] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The chromatin structure of the pea plastocyanin gene (PetE) was examined at three different transcriptional states by investigating the acetylation states of histones H3 and H4 and the nuclease accessibility of the gene in pea roots, etiolated shoots, and green shoots. The acetylation states of histones associated with different regions of PetE were analyzed by chromatin immunoprecipitation with antibodies specific for acetylated or nonacetylated histone H3 or H4 tails, followed by polymerase chain reaction quantification. Comparison of pea tissues indicated that histone hyperacetylation was associated with increased PetE transcription in green shoots. Moreover, hyperacetylation of both histones H3 and H4 was targeted to the enhancer/promoter region in green shoots, suggesting that only specific nucleosomes along the gene were modified. Time-course digestions of nuclei with micrococcal nuclease and DNaseI indicated that the enhancer/promoter region was more resistant to digestion in the inactive gene in pea roots than was the same region in the active gene in shoots, whereas the transcribed region of PetE was digested similarly among the tissues. This finding indicates that transcription is accompanied by changes in the nuclease accessibility of the enhancer/promoter region only. Moreover, these results indicate that the changes in nuclease accessibility are organ specific, whereas histone hyperacetylation is light dependent, and they suggest that changes in nuclease accessibility precede histone hyperacetylation during PetE activation.
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Affiliation(s)
- Y L Chua
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, United Kingdom
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38
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Millen RS, Olmstead RG, Adams KL, Palmer JD, Lao NT, Heggie L, Kavanagh TA, Hibberd JM, Gray JC, Morden CW, Calie PJ, Jermiin LS, Wolfe KH. Many parallel losses of infA from chloroplast DNA during angiosperm evolution with multiple independent transfers to the nucleus. Plant Cell 2001. [PMID: 11251102 DOI: 10.2307/3871412] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
We used DNA sequencing and gel blot surveys to assess the integrity of the chloroplast gene infA, which codes for translation initiation factor 1, in >300 diverse angiosperms. Whereas most angiosperms appear to contain an intact chloroplast infA gene, the gene has repeatedly become defunct in approximately 24 separate lineages of angiosperms, including almost all rosid species. In four species in which chloroplast infA is defunct, transferred and expressed copies of the gene were found in the nucleus, complete with putative chloroplast transit peptide sequences. The transit peptide sequences of the nuclear infA genes from soybean and Arabidopsis were shown to be functional by their ability to target green fluorescent protein to chloroplasts in vivo. Phylogenetic analysis of infA sequences and assessment of transit peptide homology indicate that the four nuclear infA genes are probably derived from four independent gene transfers from chloroplast to nuclear DNA during angiosperm evolution. Considering this and the many separate losses of infA from chloroplast DNA, the gene has probably been transferred many more times, making infA by far the most mobile chloroplast gene known in plants.
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Affiliation(s)
- R S Millen
- Department of Environmental, Population, and Organismic Biology, University of Colorado, Boulder, Colorado 80309, USA
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39
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Millen RS, Olmstead RG, Adams KL, Palmer JD, Lao NT, Heggie L, Kavanagh TA, Hibberd JM, Gray JC, Morden CW, Calie PJ, Jermiin LS, Wolfe KH. Many parallel losses of infA from chloroplast DNA during angiosperm evolution with multiple independent transfers to the nucleus. Plant Cell 2001; 13:645-58. [PMID: 11251102 PMCID: PMC135507 DOI: 10.1105/tpc.13.3.645] [Citation(s) in RCA: 290] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2000] [Accepted: 01/20/2001] [Indexed: 05/18/2023]
Abstract
We used DNA sequencing and gel blot surveys to assess the integrity of the chloroplast gene infA, which codes for translation initiation factor 1, in >300 diverse angiosperms. Whereas most angiosperms appear to contain an intact chloroplast infA gene, the gene has repeatedly become defunct in approximately 24 separate lineages of angiosperms, including almost all rosid species. In four species in which chloroplast infA is defunct, transferred and expressed copies of the gene were found in the nucleus, complete with putative chloroplast transit peptide sequences. The transit peptide sequences of the nuclear infA genes from soybean and Arabidopsis were shown to be functional by their ability to target green fluorescent protein to chloroplasts in vivo. Phylogenetic analysis of infA sequences and assessment of transit peptide homology indicate that the four nuclear infA genes are probably derived from four independent gene transfers from chloroplast to nuclear DNA during angiosperm evolution. Considering this and the many separate losses of infA from chloroplast DNA, the gene has probably been transferred many more times, making infA by far the most mobile chloroplast gene known in plants.
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Affiliation(s)
- R S Millen
- Department of Environmental, Population, and Organismic Biology, University of Colorado, Boulder, Colorado 80309, USA
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Graham LA, Gray JC, Kenny RA. Comparison of provocative tests for unexplained syncope: isoprenaline and glyceryl trinitrate for diagnosing vasovagal syncope. Eur Heart J 2001; 22:497-503. [PMID: 11237545 DOI: 10.1053/euhj.1999.2007] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
AIMS To compare the sensitivity, specificity and adverse event profile of glyceryl trinitrate head-up tilt with isoprenaline head-up tilt in the diagnosis of vasovagal syncope in patients with unexplained syncope and healthy controls. METHODS AND RESULTS Forty-eight patients with unexplained syncope and negative passive head-up tilt at 70 degrees for 40 min, and 14 healthy controls underwent glyceryl trinitrate head-up tilt and isoprenaline head-up tilt (maximum dose 5 microg x min(-1)) one week apart in random order. Outcome measures were production of symptoms (syncope, pre-syncope) with development of hypotension. In those with negative passive head-up tilt, the sensitivity of glyceryl trinitrate for diagnosing vasovagal syncope was 48% and the specificity was 71%. Glyceryl trinitrate was well tolerated. Isoprenaline sensitivity was 21% with specificity 64%. Side-effects prevented completion of the test in 68%. Commonest adverse events were the development of hypertension or tachycardia and intolerable flushing or nausea. CONCLUSIONS Glyceryl trinitrate head-up tilt is as effective as isoprenaline head-up tilt as a provocative agent for vasovagal syncope and has a lower incidence of adverse events.
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Affiliation(s)
- L A Graham
- Cardiovascular Investigation Unit, Royal Victoria Infirmary, Newcastle upon Tyne, UK
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41
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Abstract
Structural features of cytochrome f necessary for assembly into the cytochrome bf complex were examined in isolated pea chloroplasts following import of (35)S-labelled chimeric precursor proteins, consisting of the presequence of the small subunit of Rubisco fused to the turnip cytochrome f precursor. Assembly was detected by nondenaturing gel electrophoresis of dodecyl maltoside-solubilized thylakoid membranes. A cytochrome f polypeptide unable to bind haem because of mutagenesis of Cys21 and Cys24 to alanine residues was assembled into the complex and had similar stability to the wild-type polypeptide. This indicates that covalent haem binding to cytochrome f is not necessary for assembly of the protein into the cytochrome bf complex. A truncated protein lacking the C-terminal 33 amino acid residues, including the transmembrane span and the stroma-exposed region, was translocated across the thylakoid membrane, had a similar stability to wild-type cytochrome f but was not assembled into the complex. This indicates that the C-terminal region of cytochrome f is important for assembly into the complex. A mutant cytochrome f unable to bind haem and lacking the C-terminal region was also translocated across the thylakoid membrane but was extremely labile, indicating that, in the absence of the C-terminal membrane anchor, haem-less cytochrome f is recognized by a thylakoid proteolytic system.
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Affiliation(s)
- R M Mould
- Department of Plant Sciences, University of Cambridge, UK.
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42
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Row PE, Gray JC. Chloroplast precursor proteins compete to form early import intermediates in isolated pea chloroplasts. J Exp Bot 2001; 52:47-56. [PMID: 11181712] [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: 12/16/2023]
Abstract
In order to ascertain whether there is one site for the import of precursor proteins into chloroplasts or whether different precursor proteins are imported via different import machineries, chloroplasts were incubated with large quantities of the precursor of the 33 kDa subunit of the oxygen-evolving complex (pOE33) or the precursor of the light-harvesting chlorophyll a/b-binding protein (pLHCP) and tested for their ability to import a wide range of other chloroplast precursor proteins. Both pOE33 and pLHCP competed for import into chloroplasts with precursors of the stromally-targeted small subunit of Rubisco (pSSu), ferredoxin NADP(+) reductase (pFNR) and porphobilinogen deaminase; the thylakoid membrane proteins LHCP and the Rieske iron-sulphur protein (pRieske protein); ferrochelatase and the gamma subunit of the ATP synthase (which are both associated with the thylakoid membrane); the thylakoid lumenal protein plastocyanin and the phosphate translocator, an integral membrane protein of the inner envelope. The concentrations of pOE33 or pLHCP required to cause half-maximal inhibition of import ranged between 0.2 and 4.9 microM. These results indicate that all of these proteins are imported into the chloroplast by a common import machinery. Incubation of chloroplasts with pOE33 inhibited the formation of early import intermediates of pSSu, pFNR and pRieske protein.
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Affiliation(s)
- P E Row
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
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Row PE, Gray JC. The effect of amino acid-modifying reagents on chloroplast protein import and the formation of early import intermediates. J Exp Bot 2001; 52:57-66. [PMID: 11181713] [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: 05/23/2023]
Abstract
In order to identify functionally important amino acid residues in the chloroplast protein import machinery, chloroplasts were preincubated with amino-acid-modifying reagents and then allowed to import or form early import intermediates with precursor proteins. Incubation of chloroplasts with N-ethyl maleimide, diethyl pyrocarbonate, phenylglyoxal, 4,4'-di-isothiocyanatostilbene 2,2'-disulphonic acid (DIDS), dicyclohexylcarbodiimide (DCCD), and 1-ethyl- 3-dimethylaminopropylcarbodiimide (EDC) inhibited both import and formation of early import intermediates with precursor proteins by chloroplasts. This suggests that one or more of the binding components of the chloroplast protein import machinery contains functionally important solvent-exposed cysteine, histidine, arginine, and aspartate/glutamate residues, as well as functionally important lysine and aspartate/ glutamate residues in a hydrophobic environment.
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Affiliation(s)
- P E Row
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
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Abstract
In order to ascertain whether there is one site for the import of precursor proteins into chloroplasts or whether different precursor proteins are imported via different import machineries, chloroplasts were incubated with large quantities of the precursor of the 33 kDa subunit of the oxygen-evolving complex (pOE33) or the precursor of the light-harvesting chlorophyll a/b-binding protein (pLHCP) and tested for their ability to import a wide range of other chloroplast precursor proteins. Both pOE33 and pLHCP competed for import into chloroplasts with precursors of the stromally-targeted small subunit of Rubisco (pSSu), ferredoxin NADP(+) reductase (pFNR) and porphobilinogen deaminase; the thylakoid membrane proteins LHCP and the Rieske iron-sulphur protein (pRieske protein); ferrochelatase and the gamma subunit of the ATP synthase (which are both associated with the thylakoid membrane); the thylakoid lumenal protein plastocyanin and the phosphate translocator, an integral membrane protein of the inner envelope. The concentrations of pOE33 or pLHCP required to cause half-maximal inhibition of import ranged between 0.2 and 4.9 microM. These results indicate that all of these proteins are imported into the chloroplast by a common import machinery. Incubation of chloroplasts with pOE33 inhibited the formation of early import intermediates of pSSu, pFNR and pRieske protein.
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Affiliation(s)
- P E Row
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
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Abstract
OBJECTIVES The role of Helicobacter pylori in the pathogenesis of colorectal polyps and colorectal carcinoma is unknown. H. pylori infection causes fasting and meal stimulated hypergastrinemia. Gastrin increases colorectal mucosal proliferation and promotes tumor growth. We performed a prospective study to determine the seroprevalence of H. pylori in patients with colorectal polyps and colorectal carcinoma and in controls. METHODS Blood samples were collected from 189 patients with colorectal carcinoma, 57 patients with colorectal polyps, and 179 controls. H. pylori serology was determined by an ELISA assay. RESULTS Logistic regression showed no difference in seroprevalence of H. pylori between patients with colorectal cancer and controls (odds ratio, 1.1; 95% confidence interval, 0.7 to 1.8) or between patients with colorectal polyps and controls (odds ratio 1.3; 95% confidence interval, 0.7 to 2.5). Age and sex were not found to be associated with H. pylori infection. Patients in social classes IV and V were 2.3 times more likely to have H. pylori infection than those in social classes I, II, and III (95% confidence interval, 1.3 to 4.2). CONCLUSIONS This study shows that there is no increase in the seroprevalence of H. pylori in patients with colorectal polyps or colorectal carcinoma compared with controls. These results do not support the hypothesis that there is a relationship between H. pylori infection and the development of colorectal neoplasia.
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Affiliation(s)
- R K Siddheshwar
- Department of Surgery, Regional School of Medicine, North Tyneside General Hospital, Tyne & Wear, North Shields, England
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Abstract
BACKGROUND The relationship between plasma gastrin levels and colorectal cancer is controversial. When confounding factors which increase plasma gastrin levels are taken into account, it has been shown that gastrin levels are not elevated in patients with colorectal cancer. However, these studies only measured amidated gastrin. Total gastrin (which includes unprocessed, partially processed, and mature forms of gastrin) has been shown to be elevated in patients with colorectal cancer. AIMS The aim of this study was to determine whether fasting plasma levels of progastrin, amidated gastrin, or glycine extended gastrin are elevated in patients with colorectal cancer or colorectal polyps compared with controls. METHODS Progastrin, amidated gastrin, and glycine extended gastrin were estimated by radioimmunoassay using the following antibodies: L289, 109-21, and L2. Blood samples were analysed for Helicobacter pylori by an enzyme linked immunosorbent assay. RESULTS Median progastrin levels were significantly higher in the cancer group (27.5 pmol/l) than in the polyp (< or =15 pmol/l) or control (< or =15 pmol/l) group (p=0.0001 There was no difference in median levels of amidated gastrin between groups. Median levels of amidated gastrin were significantly higher in H pylori positive patients (19 pmol/l) than in H pylori negative patients (8 pmol/l) (p=0.0022). Median plasma progastrin levels were significantly higher for moderately dysplastic polyps (38 pmol/l) compared with mildly dysplastic (15 pmol/l) and severely dysplastic (15 pmol/l) polyps (p=0.05). CONCLUSIONS Plasma levels of progastrin, but not amidated gastrin or glycine extended gastrin, are significantly elevated in patients with colorectal cancer compared with those with colorectal polyps or controls, irrespective of their H pylori status. We conclude that measuring plasma progastrin levels in patients with colorectal cancer is warranted.
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Affiliation(s)
- R K Siddheshwar
- Department of Surgery, Regional School of Medicine, North Tyneside General Hospital, Rake Lane, North Shields, Tyne and Wear NE29 8NH, UK
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Sullivan JA, Gray JC. The pea light-independent photomorphogenesis1 mutant results from partial duplication of COP1 generating an internal promoter and producing two distinct transcripts. Plant Cell 2000; 12:1927-38. [PMID: 11041887 PMCID: PMC149130 DOI: 10.1105/tpc.12.10.1927] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2000] [Accepted: 07/17/2000] [Indexed: 05/19/2023]
Abstract
The pea lip1 (light-independent photomorphogenesis1) mutant shows many of the characteristics of light-grown development when grown in continuous darkness. To investigate the identity of LIP1, cDNAs encoding the pea homolog of COP1, a repressor of photomorphogenesis identified in Arabidopsis, were isolated from wild-type and lip1 pea seedlings. lip1 seedlings contained a wild-type COP1 transcript as well as a larger COP1' transcript that contained an internal in-frame duplication of 894 bp. The COP1' transcript segregated with the lip1 phenotype in F(2) seedlings and could be translated in vitro to produce a protein of approximately 100 kD. The COP1 gene in lip1 peas contained a 7.5-kb duplication, consisting of exons 1 to 7 of the wild-type sequence, located 2.5 kb upstream of a region of genomic DNA identical to the wild-type COP1 DNA sequence. Transcription and splicing of the mutant COP1 gene was predicted to produce the COP1' transcript, whereas transcription from an internal promoter in the 2.5-kb region of DNA located between the duplicated regions of COP1 would produce the wild-type COP1 transcript. The presence of small quantities of wild-type COP1 transcripts may reduce the severity of the phenotype produced by the mutated COP1' protein. The genomic DNA sequences of the COP1 gene from wild-type and lip1 peas and the cDNA sequences of COP1 and COP1' transcripts have been submitted to the EMBL database under the EMBL accession numbers AJ276591, AJ276592, AJ289773, and AJ289774, respectively.
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Affiliation(s)
- J A Sullivan
- Department of Plant Sciences and Cambridge Centre for Molecular Recognition, University of Cambridge, Downing Street, Cambridge, CB2 3EA, United Kingdom
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Abstract
An enantiomeric assay for the flavonoids vestitone and medicarpin from transgenic plant extracts was developed using capillary electrophoresis. It was found that no single cyclodextrin proved capable of resolving the enantiomers of both medicarpin and vestitone. Instead, hydroxypropyl-beta-cyclodextrin provided the best selectivity for the vestitones while hydroxypropyl-gamma-cyclodextrin was best for the medicarpins. The addition of organic modifiers improved the resolution of both enantiomers. Acetonitrile proved best for the vestitones and only methanol improved the resolution of the medicarpins. An optimization study of mixed hydroxypropyl-beta-cyclodextrin and hydroxypropyl-gamma-cyclodextrin containing electrolytes revealed that the separation of the medicarpin enantiomers was intolerant to the presence of hydroxypropyl-beta-cyclodextrin. Our optimized running electrolyte was composed of 2 mM hydroxypropyl-beta-cyclodextrin, 20 mM hydroxypropyl-gamma-cyclodextrin, and 25 mM borate at pH 10.0 with 10% v/v methanol. This system provided a resolution of 1.47 and 1.80 for the medicarpin and vestitone enantiomers, respectively. This analysis was completed in 12 min. This separation provided a rapid screen to determine the enantiomeric purity of key flavonoids biosynthesized by transgenic legumes.
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Affiliation(s)
- D J Allen
- Department of Physical Sciences, Southeastern Oklahoma State University, Durant 74701-0609, USA
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Gong XS, Wen JQ, Fisher NE, Young S, Howe CJ, Bendall DS, Gray JC. The role of individual lysine residues in the basic patch on turnip cytochrome f for electrostatic interactions with plastocyanin in vitro. Eur J Biochem 2000; 267:3461-8. [PMID: 10848961 DOI: 10.1046/j.1432-1327.2000.01366.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The role of electrostatic interactions in determining the rate of electron transfer between cytochrome f and plastocyanin has been examined in vitro with mutants of turnip cytochrome f and mutants of pea and spinach plastocyanins. Mutation of lysine residues Lys58, Lys65 and Lys187 of cytochrome f to neutral or acidic residues resulted in decreased binding constants and decreased rates of electron transfer to wild-type pea plastocyanin. Interaction of the cytochrome f mutant K187E with the pea plastocyanin mutant D51K gave a further decrease in electron transfer rate, indicating that a complementary charge pair at these positions could not compensate for the decreased overall charge on the proteins. Similar results were obtained with the interaction of the cytochrome f mutant K187E with single, double and triple mutants of residues in the acidic patches of spinach plastocyanin. These results suggest that the lysine residues of the basic patch on cytochrome f are predominantly involved in long-range electrostatic interactions with plastocyanin. However, analysis of the data using thermodynamic cycles provided evidence for the interaction of Lys187 of cytochrome f with Asp51, Asp42 and Glu43 of plastocyanin in the complex, in agreement with a structural model of a cytochrome f-plastocyanin complex determined by NMR.
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Affiliation(s)
- X S Gong
- Cambridge Centre for Molecular Recognition and Department of Plant Sciences, University of Cambridge, UK
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Paul MJ, Driscoll SP, Andralojc PJ, Knight JS, Gray JC, Lawlor DW. Decrease of phosphoribulokinase activity by antisense RNA in transgenic tobacco: definition of the light environment under which phosphoribulokinase is not in large excess. Planta 2000; 211:112-9. [PMID: 10923711 DOI: 10.1007/s004250000269] [Citation(s) in RCA: 18] [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] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
To test the hypothesis that the contribution of phosphoribulokinase (PRK) to the control of photosynthesis changes depending on the light environment of the plant, the response of transgenic tobacco (Nicotiana tabacum L.) transformed with antisense PRK constructs to irradiance was determined. In plants grown under low irradiance (330 micromol m(-2) s(-1)) steady-state photosynthesis was limited in plants with decreased PRK activity upon exposure to higher irradiance, with a control coefficient of PRK for CO2 assimilation of 0.25 at and above 800 micromol m(-2) s(-1). The flux control coefficient of PRK for steady-state CO2 assimilation was zero, however, at all irradiances in plant material grown at 800 micromol m(-2) s(-1) and in plants grown in a glasshouse during mid-summer (alternating shade and sun 300-1600 micromol m(-2) s(-1)). To explain these differences between plants grown under low and high irradiances, Calvin cycle enzyme activities and metabolite content were determined. Activities of PRK and other non-equilibrium Calvin cycle enzymes fructose-1,6-bisphosphatase, sedoheptulose-1,7-bisphosphatase and ribulose-1,5-bisphosphate carboxylase-oxygenase were twofold higher in plants grown at 800 micromol m(-2) s(-1) or in the glasshouse than in plants grown at 330 micromol m(-2) s(-1). Activities of equilibrium enzymes transketolase, aldolase, ribulose-5-phosphate epimerase and isomerase were very similar under all growth irradiances. The flux control coefficient of 0.25 in plants grown at 330 micromol m(-2) s(-1) can be explained because low ribulose-5-phosphate content in combination with low PRK activity limits the synthesis of ribulose-1,5-bisphosphate. This limitation is overcome in high-light-grown plants because of the large relative increase in activities of sedoheptulose-1,7-bisphosphatase and fructose-1,6-bisphosphatase under these conditions, which facilitates the synthesis of larger amounts of ribulose-5-phosphate. This potential limitation will have maintained evolutionary selection pressure for high concentrations of PRK within the chloroplast.
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Affiliation(s)
- M J Paul
- Biochemistry and Physiology Department, IACR-Rothamsted, Harpenden, Hertfordshire, UK
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