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Reis C, Chambel S, Ferreira A, Cruz CD. Involvement of nerve growth factor (NGF) in chronic neuropathic pain - a systematic review. Rev Neurosci 2023; 34:75-84. [PMID: 35792932 DOI: 10.1515/revneuro-2022-0037] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 06/03/2022] [Indexed: 01/11/2023]
Abstract
Pain is a complex experience, encompassing physiological and psychological components. Amongst the different types of pain, neuropathic pain, resulting from injuries to the peripheral or central nervous system, still constitutes a challenge for researchers and clinicians. Nerve growth factor (NGF) is currently regarded as a key contributor and may serve as a therapeutic target in many types of pain, likely including neuropathic pain. Here, we reviewed the role of NGF in neuropathic pain of peripheral and central origin, also addressing its potential use as a pharmacological target to better help patients dealing with this condition that severely impacts the everyday life. For this, we conducted a search in the databases PubMed and Scopus. Our search resulted in 1103 articles (458 in PubMed and 645 in Scopus). Only articles related to the involvement of NGF in pain or articles that approached its potential use as a target in treatment of pain symptoms were included. Duplicates were eliminated and 274 articles were excluded. After careful analysis, 23 articles were selected for review. Original articles studying the role of NGF in pathology as well as its modulation as a possible therapeutic target were included. We found that NGF is widely regarded as a key player in neuropathic pain and seen as a putative therapeutic target. However, evidence obtained from years of clinical trials highlights the toxic adverse effects of anti-NGF therapeutics, precluding its use in clinical context. Further studies are, thus, needed to improve treatment of chronic neuropathic pain.
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Affiliation(s)
- Catarina Reis
- Faculty of Medicine of Porto, University of Porto, Porto, Portugal
| | - Sílvia Chambel
- Experimental Biology Unit, Department of Biomedicine, Faculty of Medicine of Porto, University of Porto, Porto, Portugal
- Translational Neurourology, Instituto de Investigação e Inovação em Saúde-i3S and IBMC, Universidade do Porto, Porto, Portugal
| | - Ana Ferreira
- Experimental Biology Unit, Department of Biomedicine, Faculty of Medicine of Porto, University of Porto, Porto, Portugal
- Translational Neurourology, Instituto de Investigação e Inovação em Saúde-i3S and IBMC, Universidade do Porto, Porto, Portugal
| | - Célia Duarte Cruz
- Experimental Biology Unit, Department of Biomedicine, Faculty of Medicine of Porto, University of Porto, Porto, Portugal
- Translational Neurourology, Instituto de Investigação e Inovação em Saúde-i3S and IBMC, Universidade do Porto, Porto, Portugal
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Wei D, Qi J, Hamblin MR, Wen X, Jiang X, Yang H. Near-infrared photoimmunotherapy: design and potential applications for cancer treatment and beyond. Am J Cancer Res 2022; 12:7108-7131. [PMID: 36276636 PMCID: PMC9576624 DOI: 10.7150/thno.74820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 09/28/2022] [Indexed: 11/22/2022] Open
Abstract
Near-infrared photoimmunotherapy (NIR-PIT) is a newly developed cancer treatment modality based on a target-specific photosensitizer conjugate (TSPC) composed of an NIR phthalocyanine photosensitizer and an antigen-specific recognition system. NIR-PIT has predominantly been used for targeted therapy of tumors via local irradiation with NIR light, following binding of TSPC to antigen-expressing cells. Physical stress-induced membrane damage is thought to be a major mechanism underlying NIR-PIT-triggered photokilling. Notably, NIR-PIT can rapidly induce immunogenic cell death and activate the adaptive immune response, thereby enabling its combination with immune checkpoint inhibitors. Furthermore, NIR-PIT-triggered “super-enhanced permeability and retention” effects can enhance drug delivery into tumors. Supported by its potential efficacy and safety, NIR-PIT is a rapidly developing therapeutic option for various cancers. Hence, this review seeks to provide an update on the (i) broad range of target molecules suitable for NIR-PIT, (ii) various types of receptor-selective ligands for designing the TSPC “magic bullet,” (iii) NIR light parameters, and (iv) strategies for enhancing the efficacy of NIR-PIT. Moreover, we review the potential application of NIR-PIT, including the specific design and efficacy in 19 different cancer types, and its clinical studies. Finally, we summarize possible NIR-PIT applications in noncancerous conditions, including infection, pain, itching, metabolic disease, autoimmune disease, and tissue engineering.
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Affiliation(s)
- Danfeng Wei
- Department of Dermatology and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, China.,Laboratory of Dermatology, Clinical Institute of Inflammation and Immunology, Frontiers Science Center for Disease-related Molecular Network West China Hospital, Sichuan University, Chengdu 610041, China.,NHC Key Lab of Transplant Engineering and Immunology, Organ Transplant Center, West China Hospital, Sichuan University, Chengdu, Chengdu 610041, China
| | - Jinxin Qi
- Department of Dermatology and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, China.,Laboratory of Dermatology, Clinical Institute of Inflammation and Immunology, Frontiers Science Center for Disease-related Molecular Network West China Hospital, Sichuan University, Chengdu 610041, China
| | - Michael R Hamblin
- Laser Research Centre, Faculty of Health Science, University of Johannesburg, Doornfontein 2028, South Africa
| | - Xiang Wen
- Department of Dermatology and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Xian Jiang
- Department of Dermatology and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, China.,Laboratory of Dermatology, Clinical Institute of Inflammation and Immunology, Frontiers Science Center for Disease-related Molecular Network West China Hospital, Sichuan University, Chengdu 610041, China
| | - Hao Yang
- NHC Key Lab of Transplant Engineering and Immunology, Organ Transplant Center, West China Hospital, Sichuan University, Chengdu, Chengdu 610041, China.,Sichuan Provincial Engineering Laboratory of Pathology in Clinical Application, West China Hospital, Sichuan University
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Jiang XW, Yu WH, Wang Y, Xiong ZL, Ma XL, Zhou C, Huo MH. Acetyl-11-keto-beta-boswellic acid promotes sciatic nerve repair after injury: molecular mechanism. Neural Regen Res 2022; 17:2778-2784. [PMID: 35662229 PMCID: PMC9165397 DOI: 10.4103/1673-5374.339494] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Previous studies showed that acetyl-11-keto-beta-boswellic acid (AKBA), the active ingredient in the natural Chinese medicine Boswellia, can stimulate sciatic nerve injury repair via promoting Schwann cell proliferation. However, the underlying molecular mechanism remains poorly understood. In this study, we performed genomic sequencing in a rat model of sciatic nerve crush injury after gastric AKBA administration for 30 days. We found that the phagosome pathway was related to AKBA treatment, and brain-derived neurotrophic factor expression in the neurotrophic factor signaling pathway was also highly up-regulated. We further investigated gene and protein expression changes in the phagosome pathway and neurotrophic factor signaling pathway. Myeloperoxidase expression in the phagosome pathway was markedly decreased, and brain-derived neurotrophic factor, nerve growth factor, and nerve growth factor receptor expression levels in the neurotrophic factor signaling pathway were greatly increased. Additionally, expression levels of the inflammatory factors CD68, interleukin-1β, pro-interleukin-1β, and tumor necrosis factor-α were also decreased. Myelin basic protein- and β3-tubulin-positive expression as well as the axon diameter-to-total nerve diameter ratio in the injured sciatic nerve were also increased. These findings suggest that, at the molecular level, AKBA can increase neurotrophic factor expression through inhibiting myeloperoxidase expression and reducing inflammatory reactions, which could promote myelin sheath and axon regeneration in the injured sciatic nerve.
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Russo I, Fagotto L, Colombo A, Sartor E, Luisetto R, Alaibac M. Near-infrared photoimmunotherapy for the treatment of skin disorders. Expert Opin Biol Ther 2021; 22:509-517. [PMID: 34860146 DOI: 10.1080/14712598.2022.2012147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
INTRODUCTION Near-Infrared Photoimmunotherapy (NIR-PIT) is a novel molecularly targeted phototherapy. This technique is based on a conjugate of a near-infrared photo-inducible molecule (antibody-photon absorber conjugate, APC) and a monoclonal antibody that targets a tumor-specific antigen. To date, this novel approach has been successfully applied to several types of cancer. AREAS COVERED The authors discuss the possible use of NIR-PIT for the management of skin diseases, with special attention given to squamous cell carcinomas, advanced melanomas, and primary cutaneous lymphomas. EXPERT OPINION NIR-PIT may be an attractive strategy for the treatment of skin disorders. The main advantage of NIR-PIT therapy is its low toxicity to healthy tissues. Cutaneous lymphocyte antigen is a potential molecular target for NIR-PIT for both cutaneous T-cell lymphomas and inflammatory skin disorders.
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Affiliation(s)
- Irene Russo
- Unit of Dermatology, University of Padua, Padova, Italy
| | - Laura Fagotto
- Unit of Dermatology, University of Padua, Padova, Italy
| | - Anna Colombo
- Unit of Dermatology, University of Padua, Padova, Italy
| | - Emma Sartor
- Unit of Dermatology, University of Padua, Padova, Italy
| | - Roberto Luisetto
- DISCOG-Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy
| | - Mauro Alaibac
- Unit of Dermatology, University of Padua, Padova, Italy
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Middleton SJ, Perez-Sanchez J, Dawes JM. The structure of sensory afferent compartments in health and disease. J Anat 2021; 241:1186-1210. [PMID: 34528255 PMCID: PMC9558153 DOI: 10.1111/joa.13544] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 08/12/2021] [Accepted: 08/30/2021] [Indexed: 12/20/2022] Open
Abstract
Primary sensory neurons are a heterogeneous population of cells able to respond to both innocuous and noxious stimuli. Like most neurons they are highly compartmentalised, allowing them to detect, convey and transfer sensory information. These compartments include specialised sensory endings in the skin, the nodes of Ranvier in myelinated axons, the cell soma and their central terminals in the spinal cord. In this review, we will highlight the importance of these compartments to primary afferent function, describe how these structures are compromised following nerve damage and how this relates to neuropathic pain.
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Affiliation(s)
- Steven J Middleton
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
| | | | - John M Dawes
- Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
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Testa G, Cattaneo A, Capsoni S. Understanding pain perception through genetic painlessness diseases: The role of NGF and proNGF. Pharmacol Res 2021; 169:105662. [PMID: 34000361 DOI: 10.1016/j.phrs.2021.105662] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 04/23/2021] [Accepted: 05/03/2021] [Indexed: 01/25/2023]
Abstract
Nerve growth factor (NGF), by binding to TrkA and p75NTR receptors, regulates the survival and differentiation of sensory neurons during development and mediates pain transmission and perception during adulthood, by acting at different levels of the nervous system. Key to understanding the role of NGF as a pain mediator is the finding that mutations (namely, R121W, V232fs and R221W) in the NGF gene cause painlessness disease Hereditary Sensory and Autonomic Neuropathy type V (HSAN V). Here we shall review the consequences of these NGF mutations, each of which results in specific clinical signs: R221W determines congenital pain insensitivity with no overt cognitive disabilities, whereas V232fs and R121W also result in intellectual disability, thus showing similarities to HSAN IV, which is caused by mutations in TrkA, rather than to HSAN V. Comparing the cellular, biochemical and clinical findings of these mutations could help in better understanding not only the possible mechanisms underlying HSAN V, but also mechanisms of NGF signalling and roles. These mutations alter the balance between NGF and proNGF in favour of an accumulation of the latter, suggesting a possible role of proNGF as a molecule with an analgesic role. Furthermore, the neurotrophic and pronociceptive functions of NGF are split by the R221W mutation, making NGF variants based on this mutation interesting for designing therapeutic applications for many diseases. This review emphasizes the possibility of using the mutations involved in "painlessness" clinical disorders as an innovative approach to identify new proteins and pathways involved in pain transmission and perception. OUTSTANDING QUESTIONS: Why do homozygous HSAN V die postnatally? What is the cause of this early postnatal lethality? Is the development of a mouse or a human feeling less pain affecting higher cognitive and perceptual functions? What is the consequence of the HSAN V mutation on the development of joints and bones? Are the multiple fractures observed in HSAN V patients due exclusively to the carelessness consequent to not feeling pain, or also to an intrinsic frailty of their bones? Are heterodimers of NGFWT and NGFR221W in the heterozygote state formed? And if so, what are the properties of these heterodimeric proteins? How is the processing of proNGFR221W to NGFR221W affected by the mutation?
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Affiliation(s)
- Giovanna Testa
- Bio@SNS Laboratory of Biology, Scuola Normale Superiore, Pisa, Italy
| | - Antonino Cattaneo
- Bio@SNS Laboratory of Biology, Scuola Normale Superiore, Pisa, Italy.
| | - Simona Capsoni
- Bio@SNS Laboratory of Biology, Scuola Normale Superiore, Pisa, Italy; Section of Physiology, Department of Neuroscience and Rehabilitation, University of Ferrara, Ferrara, Italy.
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Selected Ionotropic Receptors and Voltage-Gated Ion Channels: More Functional Competence for Human Induced Pluripotent Stem Cell (iPSC)-Derived Nociceptors. Brain Sci 2020; 10:brainsci10060344. [PMID: 32503260 PMCID: PMC7348931 DOI: 10.3390/brainsci10060344] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 05/28/2020] [Accepted: 05/30/2020] [Indexed: 01/09/2023] Open
Abstract
Preclinical research using different rodent model systems has largely contributed to the scientific progress in the pain field, however, it suffers from interspecies differences, limited access to human models, and ethical concerns. Human induced pluripotent stem cells (iPSCs) offer major advantages over animal models, i.e., they retain the genome of the donor (patient), and thus allow donor-specific and cell-type specific research. Consequently, human iPSC-derived nociceptors (iDNs) offer intriguingly new possibilities for patient-specific, animal-free research. In the present study, we characterized iDNs based on the expression of well described nociceptive markers and ion channels, and we conducted a side-by-side comparison of iDNs with mouse sensory neurons. Specifically, immunofluorescence (IF) analyses with selected markers including early somatosensory transcription factors (BRN3A/ISL1/RUNX1), the low-affinity nerve growth factor receptor (p75), hyperpolarization-activated cyclic nucleotide-gated channels (HCN), as well as high voltage-gated calcium channels (VGCC) of the CaV2 type, calcium permeable TRPV1 channels, and ionotropic GABAA receptors, were used to address the characteristics of the iDN phenotype. We further combined IF analyses with microfluorimetric Ca2+ measurements to address the functionality of these ion channels in iDNs. Thus, we provide a detailed morphological and functional characterization of iDNs, thereby, underpinning their enormous potential as an animal-free alternative for human specific research in the pain field for unveiling pathophysiological mechanisms and for unbiased, disease-specific personalized drug development.
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Habib AM, Nagi K, Thillaiappan NB, Sukumaran V, Akhtar S. Vitamin D and Its Potential Interplay With Pain Signaling Pathways. Front Immunol 2020; 11:820. [PMID: 32547536 PMCID: PMC7270292 DOI: 10.3389/fimmu.2020.00820] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 04/09/2020] [Indexed: 12/12/2022] Open
Abstract
About 50 million of the U.S. adult population suffer from chronic pain. It is a complex disease in its own right for which currently available analgesics have been deemed woefully inadequate since ~20% of the sufferers derive no benefit. Vitamin D, known for its role in calcium homeostasis and bone metabolism, is thought to be of clinical benefit in treating chronic pain without the side-effects of currently available analgesics. A strong correlation between hypovitaminosis D and incidence of bone pain is known. However, the potential underlying mechanisms by which vitamin D might exert its analgesic effects are poorly understood. In this review, we discuss pathways involved in pain sensing and processing primarily at the level of dorsal root ganglion (DRG) neurons and the potential interplay between vitamin D, its receptor (VDR) and known specific pain signaling pathways including nerve growth factor (NGF), glial-derived neurotrophic factor (GDNF), epidermal growth factor receptor (EGFR), and opioid receptors. We also discuss how vitamin D/VDR might influence immune cells and pain sensitization as well as review the increasingly important topic of vitamin D toxicity. Further in vitro and in vivo experimental studies will be required to study these potential interactions specifically in pain models. Such studies could highlight the potential usefulness of vitamin D either alone or in combination with existing analgesics to better treat chronic pain.
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Affiliation(s)
| | | | | | | | - Saghir Akhtar
- College of Medicine, QU Health, Qatar University, Doha, Qatar
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Malfait AM, Miller RE, Block JA. Targeting neurotrophic factors: Novel approaches to musculoskeletal pain. Pharmacol Ther 2020; 211:107553. [PMID: 32311372 DOI: 10.1016/j.pharmthera.2020.107553] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 04/06/2020] [Indexed: 12/13/2022]
Abstract
Chronic pain represents a substantial unmet medical need globally. In recent years, the quest for a new generation of novel, safe, mechanism-based analgesic treatments has focused on neurotrophic factors, a large group of secreted proteins that control the growth and survival of different populations of neurons, but that postnatally are involved in the genesis and maintenance of pain, with biological activity in both the periphery and the central nervous system. In this narrative review, we discuss the two families of neurotrophic proteins that have been extensively studied for their role in pain: first, the neurotrophins, nerve growth factor (NGF) and brain-derived growth factor (BDNF), and secondly, the GDNF family of ligands (GFLs). We provide an overview of the pain pathway, and the pain-producing effects of these different proteins. We summarize accumulating preclinical and clinical findings with a focus on musculoskeletal pain, and on osteoarthritis in particular, because the musculoskeletal system is the most prevalent source of chronic pain and of disability, and clinical testing of these novel agents - often biologics- is most advanced in this area.
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Affiliation(s)
- Anne-Marie Malfait
- Division of Rheumatology, Rush University Medical Center, 1611 W Harrison Street, Suite 510, Chicago, IL 60612, United States of America
| | - Rachel E Miller
- Division of Rheumatology, Rush University Medical Center, 1611 W Harrison Street, Suite 510, Chicago, IL 60612, United States of America
| | - Joel A Block
- Division of Rheumatology, Rush University Medical Center, 1611 W Harrison Street, Suite 510, Chicago, IL 60612, United States of America.
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Maffei M, Morelli C, Graham E, Patriarca S, Donzelli L, Doleschall B, de Castro Reis F, Nocchi L, Chadick CH, Reymond L, Corrêa IR, Johnsson K, Hackett JA, Heppenstall PA. A ligand-based system for receptor-specific delivery of proteins. Sci Rep 2019; 9:19214. [PMID: 31844114 PMCID: PMC6915567 DOI: 10.1038/s41598-019-55797-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 10/30/2019] [Indexed: 12/24/2022] Open
Abstract
Gene delivery using vector or viral-based methods is often limited by technical and safety barriers. A promising alternative that circumvents these shortcomings is the direct delivery of proteins into cells. Here we introduce a non-viral, ligand-mediated protein delivery system capable of selectively targeting primary skin cells in-vivo. Using orthologous self-labelling tags and chemical cross-linkers, we conjugate large proteins to ligands that bind their natural receptors on the surface of keratinocytes. Targeted CRE-mediated recombination was achieved by delivery of ligand cross-linked CRE protein to the skin of transgenic reporter mice, but was absent in mice lacking the ligand's cell surface receptor. We further show that ligands mediate the intracellular delivery of Cas9 allowing for CRISPR-mediated gene editing in the skin more efficiently than adeno-associated viral gene delivery. Thus, a ligand-based system enables the effective and receptor-specific delivery of large proteins and may be applied to the treatment of skin-related genetic diseases.
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Affiliation(s)
- Mariano Maffei
- European Molecular Biology Laboratory (EMBL) Rome, Adriano Buzzati-Traverso Campus, 00015, Monterotondo, Italy.
| | - Chiara Morelli
- European Molecular Biology Laboratory (EMBL) Rome, Adriano Buzzati-Traverso Campus, 00015, Monterotondo, Italy.,Collaboration for joint PhD degree between EMBL and Heidelberg University, Faculty of Biosciences, Heidelberg, Germany
| | - Ellie Graham
- European Molecular Biology Laboratory (EMBL) Rome, Adriano Buzzati-Traverso Campus, 00015, Monterotondo, Italy
| | - Stefano Patriarca
- European Molecular Biology Laboratory (EMBL) Rome, Adriano Buzzati-Traverso Campus, 00015, Monterotondo, Italy
| | - Laura Donzelli
- European Molecular Biology Laboratory (EMBL) Rome, Adriano Buzzati-Traverso Campus, 00015, Monterotondo, Italy
| | - Balint Doleschall
- European Molecular Biology Laboratory (EMBL) Rome, Adriano Buzzati-Traverso Campus, 00015, Monterotondo, Italy
| | - Fernanda de Castro Reis
- European Molecular Biology Laboratory (EMBL) Rome, Adriano Buzzati-Traverso Campus, 00015, Monterotondo, Italy
| | - Linda Nocchi
- European Molecular Biology Laboratory (EMBL) Rome, Adriano Buzzati-Traverso Campus, 00015, Monterotondo, Italy
| | - Cora H Chadick
- European Molecular Biology Laboratory (EMBL) Rome, Adriano Buzzati-Traverso Campus, 00015, Monterotondo, Italy
| | - Luc Reymond
- Biomolecular Screening Facility, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland.,National Center of Competence in Research (NCCR) in Chemical Biology, 1015, Lausanne, Switzerland
| | | | - Kai Johnsson
- Department of Chemical Biology, Max Plank Institute for Medical Research, 69120, Heidelberg, Germany
| | - Jamie A Hackett
- European Molecular Biology Laboratory (EMBL) Rome, Adriano Buzzati-Traverso Campus, 00015, Monterotondo, Italy
| | - Paul A Heppenstall
- European Molecular Biology Laboratory (EMBL) Rome, Adriano Buzzati-Traverso Campus, 00015, Monterotondo, Italy.
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