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Pegoraro A, Grignolo M, Ruo L, Ricci L, Adinolfi E. P2X7 Variants in Pathophysiology. Int J Mol Sci 2024; 25:6673. [PMID: 38928378 PMCID: PMC11204217 DOI: 10.3390/ijms25126673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2024] [Revised: 06/11/2024] [Accepted: 06/14/2024] [Indexed: 06/28/2024] Open
Abstract
P2X7 receptor activation by extracellular adenosine triphosphate (eATP) modulates different intracellular pathways, including pro-inflammatory and tumor-promoting cascades. ATP is released by cells and necrotic tissues during stressful conditions and accumulates mainly in the inflammatory and tumoral microenvironments. As a consequence, both the P2X7 blockade and agonism have been proposed as therapeutic strategies in phlogosis and cancer. Nevertheless, most studies have been carried out on the WT fully functional receptor variant. In recent years, the discovery of P2X7 variants derived by alternative splicing mechanisms or single-nucleotide substitutions gave rise to the investigation of these new P2X7 variants' roles in different processes and diseases. Here, we provide an overview of the literature covering the function of human P2X7 splice variants and polymorphisms in diverse pathophysiological contexts, paying particular attention to their role in oncological and neuroinflammatory conditions.
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Affiliation(s)
- Anna Pegoraro
- Department of Medical Sciences, Section of Experimental Medicine, University of Ferrara, 44121 Ferrara, Italy; (M.G.); (L.R.); (L.R.)
| | | | | | | | - Elena Adinolfi
- Department of Medical Sciences, Section of Experimental Medicine, University of Ferrara, 44121 Ferrara, Italy; (M.G.); (L.R.); (L.R.)
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2
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Magni L, Yu H, Christensen NM, Poulsen MH, Frueh A, Deshar G, Johansen AZ, Johansen JS, Pless SA, Jørgensen NR, Novak I. Human P2X7 receptor variants Gly150Arg and Arg276His polymorphisms have differential effects on risk association and cellular functions in pancreatic cancer. Cancer Cell Int 2024; 24:148. [PMID: 38664691 PMCID: PMC11044319 DOI: 10.1186/s12935-024-03339-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Accepted: 04/18/2024] [Indexed: 04/29/2024] Open
Abstract
BACKGROUND The purinergic P2X7 receptor (P2X7R) plays an important role in the crosstalk between pancreatic stellate cells (PSCs) and cancer cells, thus promoting progression of pancreatic ductal adenocarcinoma (PDAC). Single nucleotide polymorphisms (SNPs) in the P2X7R have been reported for several cancers, but have not been explored in PDAC. MATERIALS AND METHODS Blood samples from PDAC patients and controls were genotyped for 11 non-synonymous SNPs in P2X7R and a risk analysis was performed. Relevant P2X7R-SNP GFP variants were expressed in PSCs and cancer cells and their function was assayed in the following tests. Responses in Ca2+ were studied with Fura-2 and dye uptake with YO-PRO-1. Cell migration was monitored by fluorescence microscopy. Released cytokines were measured with MSD assay. RESULTS Risk analysis showed that two SNPs 474G>A and 853G>A (rs28360447, rs7958316), that lead to the Gly150Arg and Arg276His variants, had a significant but opposite risk association with PDAC development, protecting against and predisposing to the disease, respectively. In vitro experiments performed on cancer cells and PSCs expressing the Gly150Arg variant showed reduced intracellular Ca2+ response, fluorescent dye uptake, and cell migration, while the Arg276His variant reduced dye uptake but displayed WT-like Ca2+ responses. As predicted, P2X7R was involved in cytokine release (IL-6, IL-1β, IL-8, TNF-α), but the P2X7R inhibitors displayed varied effects. CONCLUSION In conclusion, we provide evidence for the P2X7R SNPs association with PDAC and propose that they could be considered as potential biomarkers.
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Affiliation(s)
- Lara Magni
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Universitetsparken 13, 2100, Copenhagen Ø, Denmark
| | - Haoran Yu
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Universitetsparken 13, 2100, Copenhagen Ø, Denmark
| | - Nynne M Christensen
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Universitetsparken 13, 2100, Copenhagen Ø, Denmark
| | - Mette H Poulsen
- Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - Alexander Frueh
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Universitetsparken 13, 2100, Copenhagen Ø, Denmark
| | - Ganga Deshar
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Universitetsparken 13, 2100, Copenhagen Ø, Denmark
| | - Astrid Z Johansen
- Department of Oncology, Copenhagen University Hospital - Herlev and Gentofte Hospital, Herlev, Denmark
| | - Julia S Johansen
- Department of Oncology, Copenhagen University Hospital - Herlev and Gentofte Hospital, Herlev, Denmark
- Department of Medicine, Copenhagen University Hospital - Herlev and Gentofte, Herlev, Denmark
| | - Stephan A Pless
- Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - Niklas R Jørgensen
- Department of Clinical Biochemistry, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Ivana Novak
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Universitetsparken 13, 2100, Copenhagen Ø, Denmark.
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3
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Acuña-Castillo C, Escobar A, García-Gómez M, Bachelet VC, Huidobro-Toro JP, Sauma D, Barrera-Avalos C. P2X7 Receptor in Dendritic Cells and Macrophages: Implications in Antigen Presentation and T Lymphocyte Activation. Int J Mol Sci 2024; 25:2495. [PMID: 38473744 DOI: 10.3390/ijms25052495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 01/15/2024] [Accepted: 01/24/2024] [Indexed: 03/14/2024] Open
Abstract
The P2X7 receptor, a member of the P2X purinergic receptor family, is a non-selective ion channel. Over the years, it has been associated with various biological functions, from modulating to regulating inflammation. However, its emerging role in antigen presentation has captured the scientific community's attention. This function is essential for the immune system to identify and respond to external threats, such as pathogens and tumor cells, through T lymphocytes. New studies show that the P2X7 receptor is crucial for controlling how antigens are presented and how T cells are activated. These studies focus on antigen-presenting cells, like dendritic cells and macrophages. This review examines how the P2X7 receptor interferes with effective antigen presentation and activates T cells and discusses the fundamental mechanisms that can affect the immune response. Understanding these P2X7-mediated processes in great detail opens up exciting opportunities to create new immunological therapies.
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Affiliation(s)
- Claudio Acuña-Castillo
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9160000, Chile
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9160000, Chile
| | - Alejandro Escobar
- Laboratorio Biología Celular y Molecular, Instituto de Investigación en Ciencias Odontológicas, Facultad de Odontología, Universidad de Chile, Santiago 8380000, Chile
| | - Moira García-Gómez
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago 7800003, Chile
| | - Vivienne C Bachelet
- Escuela de Medicina, Facultad de Ciencias Médicas, Universidad de Santiago de Chile, Santiago 9160000, Chile
| | - Juan Pablo Huidobro-Toro
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9160000, Chile
| | - Daniela Sauma
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago 7800003, Chile
- Centro Ciencia & Vida, Av. Del Valle Norte 725, Huechuraba 8580000, Chile
| | - Carlos Barrera-Avalos
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9160000, Chile
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4
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Zorina-Lichtenwalter K, Ase AR, Verma V, Parra AIM, Komarova S, Khadra A, Séguéla P, Diatchenko L. Characterization of Common Genetic Variants in P2RX7 and Their Contribution to Chronic Pain Conditions. THE JOURNAL OF PAIN 2024; 25:545-556. [PMID: 37742908 DOI: 10.1016/j.jpain.2023.09.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 08/22/2023] [Accepted: 09/19/2023] [Indexed: 09/26/2023]
Abstract
The adenosine triphosphate (ATP)-gated channel P2X7 is encoded by a gene enriched for common nonsynonymous variants. Many of these variants have functional cellular effects, and some have been implicated in chronic pain. In this study, we first systematically characterized all 17 common nonsynonymous variants using whole-cell patch clamp electrophysiology. Then, we analyzed these variants for statistical association with chronic pain phenotypes using both individual P2RX7 variants as predictors and cumulative allele counts of same-direction cellular effect in univariate models. Association and validation analyses were conducted in the Orofacial Pain: Prospective Evaluation and Risk Assessment (OPPERA) cohort (N = 3260) and in the Complex Persistent Pain Conditions (CPPC) cohort (N = 900), respectively. Our results showed an association between allele A of rs7958311 and an increased risk of chronic pelvic pain, with convergent evidence for contribution to fibromyalgia and irritable bowel syndrome, confirmed in a meta-analysis. This allelic variant produced a unique cellular phenotype: a gain-of-function in channel opening, and a loss-of-function in pore opening. A computational study using a 12-state Markov model of ATP binding to the P2X7 receptor suggested that this cellular phenotype arises from an increased ATP binding affinity and an increased open channel conductance combined with a loss of sensitization. Cumulative allele count analysis did not provide additional insights. In conclusion, our results go beyond reproducing association for rs7958311 with chronic pain and suggest that its unique combination of gain-of-function in channel and loss-of-function in pore activity may explain why it is likely the only common P2RX7 variant with contribution to chronic pain. PERSPECTIVE: This study characterizes all common P2RX7 variants using cellular assays and statistical association analyses with chronic pain, with Markov state modeling of the most robustly associated variant.
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Affiliation(s)
- Katerina Zorina-Lichtenwalter
- Faculty of Dental Medicine and Oral Health Sciences, Department of Anesthesia, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada; Alan Edwards Centre for Research on Pain, Department of Anesthesia, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada
| | - Ariel R Ase
- Department of Neurology & Neurosurgery, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada; Montreal Neurological Institute/Hospital, Montreal, QC, Canada; Alan Edwards Centre for Research on Pain, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada
| | - Vivek Verma
- Faculty of Dental Medicine and Oral Health Sciences, Department of Anesthesia, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada; Alan Edwards Centre for Research on Pain, Department of Anesthesia, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada
| | - Arturo I M Parra
- Faculty of Dental Medicine and Oral Health Sciences, Department of Anesthesia, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada; Alan Edwards Centre for Research on Pain, Department of Anesthesia, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada
| | - Svetlana Komarova
- Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, QC, Canada
| | - Anmar Khadra
- Department of Physiology, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada
| | - Philippe Séguéla
- Department of Neurology & Neurosurgery, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada; Montreal Neurological Institute/Hospital, Montreal, QC, Canada; Alan Edwards Centre for Research on Pain, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada
| | - Luda Diatchenko
- Faculty of Dental Medicine and Oral Health Sciences, Department of Anesthesia, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada; Alan Edwards Centre for Research on Pain, Department of Anesthesia, Faculty of Medicine and Health Sciences, McGill University, Montreal, QC, Canada; Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, QC, Canada
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5
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Ronning KE, Déchelle-Marquet PA, Che Y, Guillonneau X, Sennlaub F, Delarasse C. The P2X7 Receptor, a Multifaceted Receptor in Alzheimer's Disease. Int J Mol Sci 2023; 24:11747. [PMID: 37511507 PMCID: PMC10380278 DOI: 10.3390/ijms241411747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2023] [Revised: 07/13/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023] Open
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disease characterized by impaired episodic memory and two pathological lesions: amyloid plaques and neurofibrillary tangles. In AD, damaged neurons and the accumulation of amyloid β (Aβ) peptides cause a significant release of high amounts of extracellular ATP, which acts as a danger signal. The purinergic receptor P2X7 is the main sensor of high concentrations of ATP, and P2X7 has been shown to be upregulated in the brains of AD patients, contributing to the disease's pathological processes. Further, there are many polymorphisms of the P2X7 gene that impact the risk of developing AD. P2X7 can directly modulate Aβ plaques and Tau protein lesions as well as the inflammatory response by regulating NLRP3 inflammasome and the expression of several chemokines. The significant role of microglial P2X7 in AD has been well established, although other cell types may also be important in P2X7-mediated mechanisms. In this review, we will discuss the different P2X7-dependent pathways involved in the development of AD.
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Affiliation(s)
- Kaitryn E Ronning
- INSERM, CNRS, Institut de la Vision, Sorbonne University, F-75012 Paris, France
| | | | - Yueshen Che
- INSERM, CNRS, Institut de la Vision, Sorbonne University, F-75012 Paris, France
| | - Xavier Guillonneau
- INSERM, CNRS, Institut de la Vision, Sorbonne University, F-75012 Paris, France
| | - Florian Sennlaub
- INSERM, CNRS, Institut de la Vision, Sorbonne University, F-75012 Paris, France
| | - Cécile Delarasse
- INSERM, CNRS, Institut de la Vision, Sorbonne University, F-75012 Paris, France
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6
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Genetzakis E, Gilchrist J, Kassiou M, Figtree GA. Development and clinical translation of P2X7 receptor antagonists: A potential therapeutic target in coronary artery disease? Pharmacol Ther 2022; 237:108228. [DOI: 10.1016/j.pharmthera.2022.108228] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 05/17/2022] [Accepted: 06/06/2022] [Indexed: 12/12/2022]
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7
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He X, Zhang Y, Xu Y, Xie L, Yu Z, Zheng J. Function of the P2X7 receptor in hematopoiesis and leukemogenesis. Exp Hematol 2021; 104:40-47. [PMID: 34687808 DOI: 10.1016/j.exphem.2021.10.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/04/2021] [Accepted: 10/08/2021] [Indexed: 10/20/2022]
Abstract
Adenosine triphosphate (ATP) accumulates at tissue injury and inflammation sites. The P2X7 receptor is an ATP-gated ion channel known for its cytotoxic activity. However, P2X7 receptors also play important roles in the growth of cancer and the immune regulation. Functional P2X7 receptor is widely expressed in murine and human hematopoietic stem cells and their lineages, including monocytes, macrophages, mast cells, and B or T lymphocytes, and participates in various physiological and pathologic activities. Therefore, it is not surprising that the P2X7 receptor is important for the normal hematopoiesis and leukemogenesis. Here, we summarize the biological functions of P2X7 receptor during both normal hematopoiesis and leukemogenesis. In particular, we found that ATP levels are dramatically increased in the leukemic bone marrow niche and the fates of leukemia-initiating cells of acute myeloid leukemia are tightly controlled by P2X7 expression and ATP-P2X7-mediated signaling pathways. These findings strongly indicate that the P2X7 receptor may be considered a potential biomarker of hematological malignancies in bone marrow niches, and its antagonists may be useful for the leukemia treatment in addition to the traditional chemotherapy.
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Affiliation(s)
- Xiaoxiao He
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Yaping Zhang
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yilu Xu
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Li Xie
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhuo Yu
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Junke Zheng
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
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Li T, Chen J, Zeng Z. Pathophysiological role of calcium channels and transporters in the multiple myeloma. Cell Commun Signal 2021; 19:99. [PMID: 34579758 PMCID: PMC8477534 DOI: 10.1186/s12964-021-00781-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 08/28/2021] [Indexed: 12/11/2022] Open
Abstract
Multiple myeloma (MM) is a common malignant tumor of plasma cells. Despite several treatment approaches in the past two decades, MM remains an aggressive and incurable disease in dire need of new treatment strategies. Approximately 70–80% of patients with MM have myeloma bone disease (MBD), often accompanied by pathological fractures and hypercalcemia, which seriously affect the prognosis of the patients. Calcium channels and transporters can mediate Ca2+ balance inside and outside of the membrane, indicating that they may be closely related to the prognosis of MM. Therefore, this review focuses on the roles of some critical calcium channels and transporters in MM prognosis, which located in the plasma membrane, endoplasmic reticulum and mitochondria. The goal of this review is to facilitate the identification of new targets for the treatment and prognosis of MM.![]() Video Abstract
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Affiliation(s)
- Tingting Li
- Department of Hematology, The First Affiliated Hospital of Fujian Medical University, 20 Chazhong Road, Fuzhou, Fujian, 350005, People's Republic of China.,Fujian Key Laboratory of Laboratory Medicine, Fuzhou, People's Republic of China
| | - Junmin Chen
- Department of Hematology, The First Affiliated Hospital of Fujian Medical University, 20 Chazhong Road, Fuzhou, Fujian, 350005, People's Republic of China. .,Fujian Key Laboratory of Laboratory Medicine, Fuzhou, People's Republic of China.
| | - Zhiyong Zeng
- Department of Hematology, The First Affiliated Hospital of Fujian Medical University, 20 Chazhong Road, Fuzhou, Fujian, 350005, People's Republic of China. .,Fujian Key Laboratory of Laboratory Medicine, Fuzhou, People's Republic of China.
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9
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He X, Wan J, Yang X, Zhang X, Huang D, Li X, Zou Y, Chen C, Yu Z, Xie L, Zhang Y, Liu L, Li S, Zhao Y, Shao H, Yu Y, Zheng J. Bone marrow niche ATP levels determine leukemia-initiating cell activity via P2X7 in leukemic models. J Clin Invest 2021; 131:140242. [PMID: 33301426 DOI: 10.1172/jci140242] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 12/09/2020] [Indexed: 12/16/2022] Open
Abstract
How particular bone marrow niche factors contribute to the leukemogenic activities of leukemia-initiating cells (LICs) remains largely unknown. Here, we showed that ATP levels were markedly increased in the bone marrow niches of mice with acute myeloid leukemia (AML), and LICs preferentially localized to the endosteal niche with relatively high ATP levels, as indicated by a sensitive ATP indicator. ATP could efficiently induce the influx of ions into LICs in an MLL-AF9-induced murine AML model via the ligand-gated ion channel P2X7. P2x7 deletion led to notably impaired homing and self-renewal capacities of LICs and contributed to an approximately 5-fold decrease in the number of functional LICs but had no effect on normal hematopoiesis. ATP/P2X7 signaling enhanced the calcium flux-mediated phosphorylation of CREB, which further transactivated phosphoglycerate dehydrogenase (Phgdh) expression to maintain serine metabolism and LIC fates. P2X7 knockdown resulted in a markedly extended survival of recipients transplanted with either human AML cell lines or primary leukemia cells. Blockade of ATP/P2X7 signaling could efficiently inhibit leukemogenesis. Here, we provide a perspective for understanding how ATP/P2X7 signaling sustains LIC activities, which may benefit the development of specific strategies for targeting LICs or other types of cancer stem cells.
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Affiliation(s)
- Xiaoxiao He
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jiangbo Wan
- Department of Hematology, Xinhua Hospital, Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiaona Yang
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Xiuze Zhang
- Optogenetics & Synthetic Biology Interdisciplinary Research Center, State Key Laboratory of Bioreactor Engineering, Research Unit of Chinese Academy of Medical Sciences, School of Pharmacy, East China University of Science and Technology, Shanghai, China
| | - Dan Huang
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xie Li
- Optogenetics & Synthetic Biology Interdisciplinary Research Center, State Key Laboratory of Bioreactor Engineering, Research Unit of Chinese Academy of Medical Sciences, School of Pharmacy, East China University of Science and Technology, Shanghai, China
| | - Yejun Zou
- Optogenetics & Synthetic Biology Interdisciplinary Research Center, State Key Laboratory of Bioreactor Engineering, Research Unit of Chinese Academy of Medical Sciences, School of Pharmacy, East China University of Science and Technology, Shanghai, China
| | - Chiqi Chen
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhuo Yu
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Li Xie
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yaping Zhang
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ligen Liu
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Shangang Li
- Yunnan Key Laboratory of Primate Biomedicine Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, China
| | - Yuzheng Zhao
- Optogenetics & Synthetic Biology Interdisciplinary Research Center, State Key Laboratory of Bioreactor Engineering, Research Unit of Chinese Academy of Medical Sciences, School of Pharmacy, East China University of Science and Technology, Shanghai, China
| | - Hongfang Shao
- Center of Reproductive Medicine, Shanghai Sixth People's Hospital, Shanghai, China
| | - Ye Yu
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Junke Zheng
- Hongqiao International Institute of Medicine, Shanghai Tongren Hospital, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Faculty of Basic Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Reproductive Medicine, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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10
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Prince DJ, Patel D, Kachlany SC. Leukotoxin (LtxA/Leukothera) induces ATP expulsion via pannexin-1 channels and subsequent cell death in malignant lymphocytes. Sci Rep 2021; 11:18086. [PMID: 34508147 PMCID: PMC8433231 DOI: 10.1038/s41598-021-97545-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 08/26/2021] [Indexed: 11/09/2022] Open
Abstract
Leukotoxin (LtxA) (Trade name, Leukothera) is a protein that is secreted from the oral bacterium Aggregatibacter actinomycetemcomitans, which targets and kills activated white blood cells (WBCs) by binding to lymphocyte function associated antigen-1 (LFA-1). Interaction between LtxA and Jurkat T-cells results in cell death and is characterized by increased intracellular Ca2+, activation of caspases, clustering of LtxA and LFA-1 within lipid rafts, and involvement of the Fas death receptor. Here, we show that LtxA can kill malignant lymphocytes via apoptotic and necrotic forms of cell death. We show that LtxA causes activation of caspases and PARP, cleavage of pannexin-1 (Panx1) channels, and expulsion of ATP, ultimately leading to cell death via apoptosis and necrosis. CRISPR-Cas9 mediated knockout (K/O) of Panx1 in Jurkat cells prevented ATP expulsion and resulted in resistance to LtxA for both apoptotic and necrotic forms of death. Resistance to necrosis could only be overcome when supplementing LtxA with endogenous ATP (bzATP). The combination of LtxA and bzATP promoted only necrosis, as no Panx1 K/O cells stained positive for phosphatidylserine (PS) exposure following the combined treatment. Inhibition of LtxA/bzATP-induced necrosis was possible when pretreating Jurkat cells with oATP, a P2X7R antagonist. Similarly, blockage of P2X7Rs with oATP prevented the intracellular mobilization of Ca2+, an important early step in LtxA induced cell death. We show that LtxA is able to kill malignant lymphocytes through an apoptotic death pathway which is potentially linked to a Panx1/P2X7R mediated necrotic form of death. Thus, inhibition of ATP release appears to significantly delay the onset of LtxA induced apoptosis while completely disabling the necrotic death pathway in T-lymphocytes, demonstrating the crucial role of ATP release in LtxA-mediated cell death.
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Affiliation(s)
- Derek J Prince
- Department of Oral Biology, Rutgers School of Dental Medicine, Newark, NJ, 07103, USA
| | | | - Scott C Kachlany
- Department of Oral Biology, Rutgers School of Dental Medicine, Newark, NJ, 07103, USA.
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11
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Kepp O, Bezu L, Yamazaki T, Di Virgilio F, Smyth MJ, Kroemer G, Galluzzi L. ATP and cancer immunosurveillance. EMBO J 2021; 40:e108130. [PMID: 34121201 DOI: 10.15252/embj.2021108130] [Citation(s) in RCA: 117] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/24/2021] [Accepted: 04/05/2021] [Indexed: 12/14/2022] Open
Abstract
While intracellular adenosine triphosphate (ATP) occupies a key position in the bioenergetic metabolism of all the cellular compartments that form the tumor microenvironment (TME), extracellular ATP operates as a potent signal transducer. The net effects of purinergic signaling on the biology of the TME depend not only on the specific receptors and cell types involved, but also on the activation status of cis- and trans-regulatory circuitries. As an additional layer of complexity, extracellular ATP is rapidly catabolized by ectonucleotidases, culminating in the accumulation of metabolites that mediate distinct biological effects. Here, we discuss the molecular and cellular mechanisms through which ATP and its degradation products influence cancer immunosurveillance, with a focus on therapeutically targetable circuitries.
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Affiliation(s)
- Oliver Kepp
- Equipe labellisée par la Ligue contre le cancer, Centre de Recherche des Cordeliers, INSERM U1138, Sorbonne Université, Université de Paris, Paris, France.,Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute, Villejuif, France
| | - Lucillia Bezu
- Equipe labellisée par la Ligue contre le cancer, Centre de Recherche des Cordeliers, INSERM U1138, Sorbonne Université, Université de Paris, Paris, France.,Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute, Villejuif, France
| | - Takahiro Yamazaki
- Department of Radiation Oncology, Weill Cornell Medical College, New York, NY, USA
| | | | - Mark J Smyth
- Immunology in Cancer and Infection Laboratory, QIMR Berghofer Medical Research Institute, Herston, Brisbane, Qld, Australia
| | - Guido Kroemer
- Equipe labellisée par la Ligue contre le cancer, Centre de Recherche des Cordeliers, INSERM U1138, Sorbonne Université, Université de Paris, Paris, France.,Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute, Villejuif, France.,Pôle de Biologie, Hôpital Européen Georges Pompidou, AP-HP, Paris, France.,Suzhou Institute for Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, China.,Department of Women's and Children's Health, Karolinska University Hospital, Stockholm, Sweden
| | - Lorenzo Galluzzi
- Department of Radiation Oncology, Weill Cornell Medical College, New York, NY, USA.,Sandra and Edward Meyer Cancer Center, New York, NY, USA.,Caryl and Israel Englander Institute for Precision Medicine, New York, NY, USA.,Department of Dermatology, Yale School of Medicine, New Haven, CT, USA.,Université de Paris, Paris, France
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12
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De Marchi E, Pegoraro A, Adinolfi E. P2X7 Receptor in Hematological Malignancies. Front Cell Dev Biol 2021; 9:645605. [PMID: 33763425 PMCID: PMC7982859 DOI: 10.3389/fcell.2021.645605] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 02/01/2021] [Indexed: 12/21/2022] Open
Abstract
The P2X7 receptor is an ion channel gated by the nucleotide ATP, known for its role in immune responses and recently emerging as a critical onco-promoting factor. Lymphocytes, myeloid cells, and their precursors were among the first cells proved to express a functional P2X7 receptor; therefore, it is not surprising that lymphoproliferative and myeloproliferative diseases, also known as hematological malignancies, were shown to be related in their insurgence and progression to P2X7 alterations. Here, we overview established and recent literature relating P2X7 with the biological mechanisms underlying leukemias, lymphomas, and multiple myeloma development. Particular attention is paid to studies published in the very recent past correlating P2X7 with ATP concentration in the leukemic microenvironment and P2X7 overexpression to acute myeloid leukemia aggressiveness and response to chemotherapy. The described literature strongly suggests that P2X7 and its genetic variants could be regarded as potential new biomarkers in hematological malignancies and that both P2X7 antagonists and agonists could emerge as new therapeutic tools alone or in combination with traditional chemotherapy.
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Affiliation(s)
- Elena De Marchi
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Anna Pegoraro
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Elena Adinolfi
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
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13
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Predicted the P2RX7 rs3751143 polymorphism is associated with cancer risk: a meta-analysis and systematic review. Biosci Rep 2021; 41:227679. [PMID: 33501930 PMCID: PMC7859319 DOI: 10.1042/bsr20193877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 01/05/2021] [Accepted: 01/22/2021] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Both meta-analyses and systematic reviews were used to assess the relationship between purinergic receptor P2X ligand-gated ion channel 7 (P2RX7) rs3751143 polymorphism and the risk of cancer. MATERIALS AND METHODS The data used in this research were collected from Google Scholar, Web of Science, CNKI, and Wan Fang Data databases. The final retrieval ended on 22 February 2019. The strength of correlation was assessed using odds ratios and 95% confidence intervals. Based on the heterogeneity test results, fixed-effect (Mantel-Haenszel) or random-effects (DerSimonian-Laird) models were selected to summarise the collective effects. RESULTS Eight separate studies containing 1462 cancer cases and 3037 controls were enrolled. Overall, there was no significant association between P2RX7 rs3751143 polymorphism and the risk of cancer in the allelic, homozygous, heterozygous, dominant, or recessive models. CONCLUSIONS Our meta-analysis indicates that there is no significant association between P2RX7 rs3751143 polymorphism and the risk of cancer in the allelic, homozygous, heterozygous, dominant, and recessive models.
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14
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Senovilla L, Vacchelli E, Galon J, Adjemian S, Eggermont A, Fridman WH, Sautès-Fridman C, Ma Y, Tartour E, Zitvogel L, Kroemer G, Galluzzi L. Trial watch: Prognostic and predictive value of the immune infiltrate in cancer. Oncoimmunology 2021; 1:1323-1343. [PMID: 23243596 PMCID: PMC3518505 DOI: 10.4161/onci.22009] [Citation(s) in RCA: 177] [Impact Index Per Article: 59.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Solid tumors are constituted of a variety of cellular components, including bona fide malignant cells as well as endothelial, structural and immune cells. On one hand, the tumor stroma exerts major pro-tumorigenic and immunosuppressive functions, reflecting the capacity of cancer cells to shape the microenvironment to satisfy their own metabolic and immunological needs. On the other hand, there is a component of tumor-infiltrating leucocytes (TILs) that has been specifically recruited in the attempt to control tumor growth. Along with the recognition of the critical role played by the immune system in oncogenesis, tumor progression and response to therapy, increasing attention has been attracted by the potential prognostic and/or predictive role of the immune infiltrate in this setting. Data from large clinical studies demonstrate indeed that a robust infiltration of neoplastic lesions by specific immune cell populations, including (but not limited to) CD8+ cytotoxic T lymphocytes, Th1 and Th17 CD4+ T cells, natural killer cells, dendritic cells, and M1 macrophages constitutes an independent prognostic indicator in several types of cancer. Conversely, high levels of intratumoral CD4+CD25+FOXP3+ regulatory T cells, Th2 CD4+ T cells, myeloid-derived suppressor cells, M2 macrophages and neutrophils have frequently been associated with dismal prognosis. So far, only a few studies have addressed the true predictive potential of TILs in cancer patients, generally comforting the notion that—at least in some clinical settings—the immune infiltrate can reliably predict if a specific patient will respond to therapy or not. In this Trial Watch, we will summarize the results of clinical trials that have evaluated/are evaluating the prognostic and predictive value of the immune infiltrate in the context of solid malignancies.
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Affiliation(s)
- Laura Senovilla
- Institut Gustave Roussy; Villejuif, France ; Université Paris-Sud/Paris XI; Orsay, France ; INSERM, U848; Villejuif, France
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15
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Zhu X, Li Q, Song W, Peng X, Zhao R. P2X7 receptor: a critical regulator and potential target for breast cancer. J Mol Med (Berl) 2021; 99:349-358. [PMID: 33486566 DOI: 10.1007/s00109-021-02041-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 01/13/2021] [Accepted: 01/14/2021] [Indexed: 12/24/2022]
Abstract
Breast cancer is currently the most common cancer and the leading cause of cancer death among women worldwide. Advanced breast cancer is prone to metastasis, and there is currently no drug to cure metastatic breast cancer. The purinergic ligand-gated ion channel 7 receptor is an ATP-gated nonselective cation channel receptor and is involved in signal transduction, growth regulation, cytokine secretion, and tumor cell development. Recent studies have shown that upregulation of the P2X7 receptor in breast cancer can mediate AKT signaling pathways, Ca2 þ-activated SK3 potassium channels, and EMT and regulate the secretion of small extracellular vesicles to promote breast cancer invasion and migration, which are affected by factors such as hypoxia and ATP. In addition, studies have shown that microRNAs can bind to the 3' untranslated region of the P2X7 receptor, which affects the occurrence and development of breast cancer by upregulating and downregulating P2X7 receptor expression. Studies have shown that new P2X7 receptor inhibitors, such as emodin and Uncaria tomentosa, can inhibit P2X7 receptor-mediated breast cancer invasion and are expected to be used clinically. This article reviews the research progress on the relationship between the P2X7 receptor and breast cancer to provide new ideas and a basis for clinical diagnosis and treatment.
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Affiliation(s)
- Xiaodi Zhu
- School of Medical Laboratory, Weifang Medical University, Weifang, Shandong, China
| | - Qianqian Li
- School of Medical Laboratory, Weifang Medical University, Weifang, Shandong, China
| | - Wei Song
- School of Medical Laboratory, Weifang Medical University, Weifang, Shandong, China
| | - Xiaoxiang Peng
- School of Medical Laboratory, Weifang Medical University, Weifang, Shandong, China.
| | - Ronglan Zhao
- School of Medical Laboratory, Weifang Medical University, Weifang, Shandong, China.
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16
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Abstract
The P2X7 receptor for extracellular ATP is a well-established mediator of tumoral development and progression both in solid cancers and hematological malignancies. The human P2X7 gene is highly polymorphic, and several splice variants of the receptor have been identified in time. P2X7 single-nucleotide polymorphisms (SNPs) have been broadly analyzed by studies relating them to pathologies as different as infectious, inflammatory, nervous, and bone diseases, among which cancer is included. Moreover, in the last years, an increasing number of reports concentrated on P2X7 splice variants’ different roles and their implications in pathological conditions, including oncogenesis. Here, we give an overview of established and recent literature demonstrating a role for human P2X7 gene products in oncological conditions, mainly focusing on current data emerging on P2X7 isoform B and nfP2X7. We explored the role of these and other genetic variants of P2X7 in cancer insurgence, dissemination, and progression, as well as the effect of chemotherapy on isoforms expression. The described literature strongly suggests that P2X7 variants are potential new biomarkers and therapeutical targets in oncological conditions and that their study in carcinogenesis deserves to be further pursued.
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17
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Zhang WJ, Zhu ZM. Association between the rs3751143 polymorphism of P2RX7 gene and chronic lymphocytic leukemia: A meta-analysis. Purinergic Signal 2020; 16:479-484. [PMID: 33026566 DOI: 10.1007/s11302-020-09737-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 09/15/2020] [Indexed: 12/16/2022] Open
Abstract
OBJECTIVES Meta-analysis was used to determine the association between rs3751143 polymorphism of P2RX7 gene and the risk of chronic lymphocytic leukemia (CLL). METHODS Search for published articles about the association between the rs3751143 and CLL in PubMed, MEDINE, Web of Science, and Embase databases, with a calculated odds ratio of (OR) and 95% confidence interval (95%CI). RESULTS A total of 1184 cases and 1725 controls in 8 studies were pooled together for evaluation of the overall association between rs3751143 and risk of CLL. Allele model (A vs C, p = 0.16, OR = 0.85, 95%CI = 0.71-1.17), homozygous model (AA vs CC, p = 0.07; OR = 0.78, 95%CI = 0.84-1.08), and heterozygous model (AC vs CC, p = 0.76; OR = 0.85; 95%CI = 0.68-0.79) did not show decreased risk of developing CLL. Similarly, dominant model (AA + AC vs. CC: p = 0.58; OR = 1.10, 95%CI = 0.69-1.75), and recessive model (AA vs AC + CC, p = 0.21, OR = 1.18, 95%CI = 0.70-1.99) failed to show decreased risk of developing CLL. However, in familial, heterozygous model (AC vs. CC: p = 0.0006, OR = 0.64, 95%CI = 0.67-1.50) and recessive model (AA vs. AC + CC: p = 0.0017; OR = 1.02, 95%CI = 0.73-2.35) indicated the association between the inheritance of rs3751143 and the risk of developing CLL. In the overall survival prognosis, no significant association between rs3751143 and CLL was detected with relatively high heterogeneity. CONCLUSIONS Our pooled data indicates that there is a correlation between the inheritance of rs3751143 and the risk of CLL in familial.
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Affiliation(s)
- Wen-Jun Zhang
- The Second Affiliated Hospital, Nanchang University, Nanchang, 343000, Jiangxi, China
| | - Zheng-Ming Zhu
- The Second Affiliated Hospital, Nanchang University, Nanchang, 343000, Jiangxi, China.
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18
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Rivas-Yáñez E, Barrera-Avalos C, Parra-Tello B, Briceño P, Rosemblatt MV, Saavedra-Almarza J, Rosemblatt M, Acuña-Castillo C, Bono MR, Sauma D. P2X7 Receptor at the Crossroads of T Cell Fate. Int J Mol Sci 2020; 21:E4937. [PMID: 32668623 PMCID: PMC7404255 DOI: 10.3390/ijms21144937] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 06/26/2020] [Accepted: 07/07/2020] [Indexed: 02/06/2023] Open
Abstract
The P2X7 receptor is a ligand-gated, cation-selective channel whose main physiological ligand is ATP. P2X7 receptor activation may also be triggered by ARTC2.2-dependent ADP ribosylation in the presence of extracellular NAD. Upon activation, this receptor induces several responses, including the influx of calcium and sodium ions, phosphatidylserine externalization, the formation of a non-selective membrane pore, and ultimately cell death. P2X7 receptor activation depends on the availability of extracellular nucleotides, whose concentrations are regulated by the action of extracellular nucleotidases such as CD39 and CD38. The P2X7 receptor has been extensively studied in the context of the immune response, and it has been reported to be involved in inflammasome activation, cytokine production, and the migration of different innate immune cells in response to ATP. In adaptive immune responses, the P2X7 receptor has been linked to T cell activation, differentiation, and apoptosis induction. In this review, we will discuss the evidence of the role of the P2X7 receptor on T cell differentiation and in the control of T cell responses in inflammatory conditions.
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Affiliation(s)
- Elizabeth Rivas-Yáñez
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago 7800003, Chile; (E.R.-Y.); (B.P.-T.); (P.B.); (M.V.R.); (J.S.-A.); (M.R.)
| | - Carlos Barrera-Avalos
- Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9160000, Chile;
| | - Brian Parra-Tello
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago 7800003, Chile; (E.R.-Y.); (B.P.-T.); (P.B.); (M.V.R.); (J.S.-A.); (M.R.)
| | - Pedro Briceño
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago 7800003, Chile; (E.R.-Y.); (B.P.-T.); (P.B.); (M.V.R.); (J.S.-A.); (M.R.)
| | - Mariana V. Rosemblatt
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago 7800003, Chile; (E.R.-Y.); (B.P.-T.); (P.B.); (M.V.R.); (J.S.-A.); (M.R.)
- Facultad de Medicina y Ciencia, Universidad San Sebastián, Santiago 7510157, Chile
| | - Juan Saavedra-Almarza
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago 7800003, Chile; (E.R.-Y.); (B.P.-T.); (P.B.); (M.V.R.); (J.S.-A.); (M.R.)
| | - Mario Rosemblatt
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago 7800003, Chile; (E.R.-Y.); (B.P.-T.); (P.B.); (M.V.R.); (J.S.-A.); (M.R.)
- Facultad de Medicina y Ciencia, Universidad San Sebastián, Santiago 7510157, Chile
- Fundación Ciencia & Vida, Santiago 7780272, Chile
| | - Claudio Acuña-Castillo
- Centro de Biotecnología Acuícola, Universidad de Santiago de Chile, Santiago 9160000, Chile
| | - María Rosa Bono
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago 7800003, Chile; (E.R.-Y.); (B.P.-T.); (P.B.); (M.V.R.); (J.S.-A.); (M.R.)
| | - Daniela Sauma
- Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago 7800003, Chile; (E.R.-Y.); (B.P.-T.); (P.B.); (M.V.R.); (J.S.-A.); (M.R.)
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19
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Lara R, Adinolfi E, Harwood CA, Philpott M, Barden JA, Di Virgilio F, McNulty S. P2X7 in Cancer: From Molecular Mechanisms to Therapeutics. Front Pharmacol 2020; 11:793. [PMID: 32581786 PMCID: PMC7287489 DOI: 10.3389/fphar.2020.00793] [Citation(s) in RCA: 102] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 05/13/2020] [Indexed: 12/18/2022] Open
Abstract
P2X7 is a transmembrane receptor expressed in multiple cell types including neurons, dendritic cells, macrophages, monocytes, B and T cells where it can drive a wide range of physiological responses from pain transduction to immune response. Upon activation by its main ligand, extracellular ATP, P2X7 can form a nonselective channel for cations to enter the cell. Prolonged activation of P2X7, via high levels of extracellular ATP over an extended time period can lead to the formation of a macropore, leading to depolarization of the plasma membrane and ultimately to cell death. Thus, dependent on its activation state, P2X7 can either drive cell survival and proliferation, or induce cell death. In cancer, P2X7 has been shown to have a broad range of functions, including playing key roles in the development and spread of tumor cells. It is therefore unsurprising that P2X7 has been reported to be upregulated in several malignancies. Critically, ATP is present at high extracellular concentrations in the tumor microenvironment (TME) compared to levels observed in normal tissues. These high levels of ATP should present a survival challenge for cancer cells, potentially leading to constitutive receptor activation, prolonged macropore formation and ultimately to cell death. Therefore, to deliver the proven advantages for P2X7 in driving tumor survival and metastatic potential, the P2X7 macropore must be tightly controlled while retaining other functions. Studies have shown that commonly expressed P2X7 splice variants, distinct SNPs and post-translational receptor modifications can impair the capacity of P2X7 to open the macropore. These receptor modifications and potentially others may ultimately protect cancer cells from the negative consequences associated with constitutive activation of P2X7. Significantly, the effects of both P2X7 agonists and antagonists in preclinical tumor models of cancer demonstrate the potential for agents modifying P2X7 function, to provide innovative cancer therapies. This review summarizes recent advances in understanding of the structure and functions of P2X7 and how these impact P2X7 roles in cancer progression. We also review potential therapeutic approaches directed against P2X7.
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Affiliation(s)
- Romain Lara
- Biosceptre (UK) Limited, Cambridge, United Kingdom
| | - Elena Adinolfi
- Department of Medical Sciences, University of Ferrara, Ferrara, Italy
| | - Catherine A Harwood
- Centre for Cell Biology and Cutaneous Research, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Mike Philpott
- Centre for Cutaneous Research, Blizard Institute, Bart's & The London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | | | - Francesco Di Virgilio
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara, Ferrara, Italy
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20
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Role of the P2X7 receptor in in vitro and in vivo glioma tumor growth. Oncotarget 2019; 10:4840-4856. [PMID: 31448051 PMCID: PMC6690673 DOI: 10.18632/oncotarget.27106] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 06/29/2019] [Indexed: 12/12/2022] Open
Abstract
Human glioblastoma cells are strikingly refractory to ATP-stimulated, P2X7 receptor (P2X7R)-mediated cytotoxicity. To elucidate the mechanistic basis of this feature, we investigated P2X7R-dependent responses in wild type and P2X7R-transfected U138 cells. Mouse GL261 glioma cells were used as an additional control. Here, we report that wild type U138 glioma cells expressed the P2X7R to very low level. Contrary to human U138 cells, mouse GL261 cells showed strong P2X7R expression and P2X7R-dependent responses. Transfection of wild type P2RX7 into U138 cells fully restored P2X7R-dependent responses. P2RX7 transfection conferred a negligible in vitro growth advantage to U138 cells, while strongly accelerated in vivo growth. In silico analysis showed that the P2RX7 gene is seldom mutated in specimens from glioblastoma multiforme (GBM) patients. These observations suggest that the P2X7R might be an important receptor promoting GBM growth.
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21
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Degauque N, Brosseau C, Brouard S. Regulation of the Immune Response by the Inflammatory Metabolic Microenvironment in the Context of Allotransplantation. Front Immunol 2018; 9:1465. [PMID: 29988548 PMCID: PMC6026640 DOI: 10.3389/fimmu.2018.01465] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 06/12/2018] [Indexed: 12/13/2022] Open
Abstract
Antigen challenge induced by allotransplantation results in the activation of T and B cells, followed by their differentiation and proliferation to mount an effective immune response. Metabolic fitness has been shown to be crucial for supporting the major shift from quiescent to active immune cells and for tuning the immune response. Metabolic reprogramming includes regulation of the balance between glycolysis and mitochondrial respiration processes. Recent research has shed new light on the functions served by the end products of metabolism such as lactate, acetate, and ATP. At enhanced local concentrations, these metabolites have complex effects in which they not only induce T and B cell responses, cell mobility, and cytokine secretion but also favor the resolution of inflammation by promoting regulatory functions. Such mechanisms are instrumental in the context of the immune response in transplantation, not only to protect the graft and/or eliminate cells targeting it but also to maintain cell homeostasis per se. Metabolic adaptation thus plays an instrumental role on the outcome of the cellular and humoral responses. This, of course, raises the possibility of drugs that would interfere in these metabolic pathways to control the immune response but also highlights the risk that some drugs may perturb this metabolism and cell homeostasis and be deleterious for graft outcome. This review focuses on how metabolic alterations of the local immune microenvironment regulate the immune response and the impact of metabolic manipulation in allotransplantation.
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Affiliation(s)
- Nicolas Degauque
- CRTI UMR 1064, INSERM, Université de Nantes, Nantes, France.,Institut de Transplantation Urologie Néphrologie (ITUN), CHU Nantes, Nantes, France
| | - Carole Brosseau
- CRTI UMR 1064, INSERM, Université de Nantes, Nantes, France.,Institut de Transplantation Urologie Néphrologie (ITUN), CHU Nantes, Nantes, France
| | - Sophie Brouard
- CRTI UMR 1064, INSERM, Université de Nantes, Nantes, France.,Institut de Transplantation Urologie Néphrologie (ITUN), CHU Nantes, Nantes, France
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22
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Tozzi M, Larsen AT, Lange SC, Giannuzzo A, Andersen MN, Novak I. The P2X7 receptor and pannexin-1 are involved in glucose-induced autocrine regulation in β-cells. Sci Rep 2018; 8:8926. [PMID: 29895988 PMCID: PMC5997690 DOI: 10.1038/s41598-018-27281-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 05/31/2018] [Indexed: 01/02/2023] Open
Abstract
Extracellular ATP is an important short-range signaling molecule that promotes various physiological responses virtually in all cell types, including pancreatic β-cells. It is well documented that pancreatic β-cells release ATP through exocytosis of insulin granules upon glucose stimulation. We hypothesized that glucose might stimulate ATP release through other non-vesicular mechanisms. Several purinergic receptors are found in β-cells and there is increasing evidence that purinergic signaling regulates β-cell functions and survival. One of the receptors that may be relevant is the P2X7 receptor, but its detailed role in β-cell physiology is unclear. In this study we investigated roles of the P2X7 receptor and pannexin-1 in ATP release, intracellular ATP, Ca2+ signals, insulin release and cell proliferation/survival in β-cells. Results show that glucose induces rapid release of ATP and significant fraction of release involves the P2X7 receptor and pannexin-1, both expressed in INS-1E cells, rat and mouse β-cells. Furthermore, we provide pharmacological evidence that extracellular ATP, via P2X7 receptor, stimulates Ca2+ transients and cell proliferation in INS-1E cells and insulin secretion in INS-1E cells and rat islets. These data indicate that the P2X7 receptor and pannexin-1 have important functions in β-cell physiology, and should be considered in understanding and treatment of diabetes.
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Affiliation(s)
- Marco Tozzi
- Section for Cell Biology and Physiology, August Krogh Building, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Anna T Larsen
- Section for Cell Biology and Physiology, August Krogh Building, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Sofie C Lange
- Section for Cell Biology and Physiology, August Krogh Building, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Andrea Giannuzzo
- Section for Cell Biology and Physiology, August Krogh Building, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Martin N Andersen
- Section for Cell Biology and Physiology, August Krogh Building, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Ivana Novak
- Section for Cell Biology and Physiology, August Krogh Building, Department of Biology, University of Copenhagen, Copenhagen, Denmark.
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23
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Vaisitti T, Arruga F, Deaglio S. Targeting the Adenosinergic Axis in Chronic Lymphocytic Leukemia: A Way to Disrupt the Tumor Niche? Int J Mol Sci 2018; 19:ijms19041167. [PMID: 29649100 PMCID: PMC5979564 DOI: 10.3390/ijms19041167] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 04/06/2018] [Accepted: 04/09/2018] [Indexed: 12/11/2022] Open
Abstract
Targeting adenosine triphosphate (ATP) metabolism and adenosinergic signaling in cancer is gaining momentum, as increasing evidence is showing their relevance in tumor immunology and biology. Chronic lymphocytic leukemia (CLL) results from the expansion of a population of mature B cells that progressively occupies the bone marrow (BM), the blood, and peripheral lymphoid organs. Notwithstanding significant progress in the treatment of these patients, the cure remains an unmet clinical need, suggesting that novel drugs or drug combinations are needed. A unique feature of CLL is its reliance on micro-environmental signals for proliferation and cell survival. We and others have shown that the lymphoid niche, an area of intense interactions between leukemic and bystander non-tumor cells, is a typically hypoxic environment. Here adenosine is generated by leukemic cells, as well as by cells of myeloid origin, acting through autocrine and paracrine mechanisms, ultimately affecting tumor growth, limiting drug responses, and skewing the immune cells towards a tolerant phenotype. Hence, understanding the mechanisms through which this complex network of enzymes, receptors, and metabolites functions in CLL, will pave the way to the use of pharmacological agents targeting the system, which, in combination with drugs targeting leukemic cells, may get us one step closer to curing these patients.
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MESH Headings
- Adenosine/metabolism
- Adenosine Triphosphate/metabolism
- Animals
- Antineoplastic Agents/pharmacology
- Antineoplastic Agents/therapeutic use
- Gene Regulatory Networks/drug effects
- Humans
- Hypoxia
- Leukemia, Lymphocytic, Chronic, B-Cell/drug therapy
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/immunology
- Leukemia, Lymphocytic, Chronic, B-Cell/metabolism
- Molecular Targeted Therapy/methods
- Signal Transduction/drug effects
- Stem Cell Niche
- Tumor Microenvironment
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Affiliation(s)
- Tiziana Vaisitti
- Department of Medical Sciences, University of Turin School of Medicine & Italian Institute for Genomic Medicine (IIGM), via Nizza, 52, 10126 Torino, Italy.
| | - Francesca Arruga
- Department of Medical Sciences, University of Turin School of Medicine & Italian Institute for Genomic Medicine (IIGM), via Nizza, 52, 10126 Torino, Italy.
| | - Silvia Deaglio
- Department of Medical Sciences, University of Turin School of Medicine & Italian Institute for Genomic Medicine (IIGM), via Nizza, 52, 10126 Torino, Italy.
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Lewandowska M, Jędrychowska-Dańska K, Zamerska A, Płoszaj T, Witas HW. The genetic profile of susceptibility to infectious diseases in Roman-Period populations from Central Poland. INFECTION GENETICS AND EVOLUTION 2016; 47:1-8. [PMID: 27847329 DOI: 10.1016/j.meegid.2016.11.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 10/13/2016] [Accepted: 11/11/2016] [Indexed: 12/17/2022]
Abstract
For thousands of years human beings have resisted life-threatening pathogens. This ongoing battle is considered to be the major force shaping our gene pool as every micro-evolutionary process provokes specific shifts in the genome, both that of the host and the pathogen. Past populations were more susceptible to changes in allele frequencies not only due to selection pressure, but also as a result of genetic drift, migration and inbreeding. In the present study we have investigated the frequency of five polymorphisms within innate immune-response genes (SLC11A1 D543N, MBL2 G161A, P2RX7 A1513C, IL10 A-1082G, TLR2 -196 to -174 ins/del) related to susceptibility to infections in humans. The DNA of individuals from two early Roman-Period populations of Linowo and Rogowo was analysed. The distribution of three mutations varied significantly when compared to the modern Polish population. The TAFT analysis suggests that the decreased frequency of SLC11A1 D543N in modern Poles as compared to 2nd century Linowo samples is the result of non-stochastic mechanisms, such as purifying or balancing selection. The disparity in frequency of other mutations is most likely the result of genetic drift, an evolutionary force which is remarkably amplified in low-size groups. Together with the FST analysis, mtDNA haplotypes' distribution and deviation from the Hardy-Weinberg equilibrium, we suggest that the two populations were not interbreeding (despite the close proximity between them), but rather inbreeding, the results of which are particularly pronounced among Rogowo habitants.
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Affiliation(s)
- Magda Lewandowska
- Department of Molecular Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University of Lodz, Lodz, 90-136, Poland.
| | - Krystyna Jędrychowska-Dańska
- Department of Molecular Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University of Lodz, Lodz, 90-136, Poland
| | - Alicja Zamerska
- Department of Molecular Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University of Lodz, Lodz, 90-136, Poland
| | - Tomasz Płoszaj
- Department of Molecular Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University of Lodz, Lodz, 90-136, Poland
| | - Henryk W Witas
- Department of Molecular Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University of Lodz, Lodz, 90-136, Poland
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Srivastava S, Tsongalis GJ, Kaur P. Role of microRNAs in regulation of the TNF/TNFR gene superfamily in chronic lymphocytic leukemia. Clin Biochem 2016; 49:1307-1310. [DOI: 10.1016/j.clinbiochem.2016.08.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 08/08/2016] [Accepted: 08/12/2016] [Indexed: 12/26/2022]
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Denlinger LC, Schell K, Angelini G, Green D, Guadarrama A, Prabhu U, Coursin DB, Hogan K, Bertics PJ. A novel assay to detect nucleotide receptor P2X7 genetic polymorphisms influencing numerous innate immune functions. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519040100020101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The importance of accessory signaling pathways amplifying endotoxin responses has recently been highlighted by genetic studies describing LPS-hyporesponsive individuals despite carrying the common allele for TLR4. The nucleotide receptor P2X7 modulates the production of numerous LPS-stimulated inflammatory mediators. We have recently described the largest phenotypic screen known for genetic polymorphisms associated with the nucleotide receptor P2X7, a global regulator of leukocyte function. This required the development of a novel monocyte pore assay with numerous advantages over previous methods and with the potential to facilitate rapid (< 3 h), multiplex analysis of clinical samples. This paper addresses aspects pertinent to the development of the monocyte pore assay, briefly summarizes our results suggestingthat P2X7 alleles modulate LPSstimulated cytokine production, and discusses a model wherein P2X7 may serve as an amplification loop of innate immunity.
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Affiliation(s)
- Loren C. Denlinger
- Department of Medicine, University of Wisconsin Medical School, Madison, Wisconsin, USA, , Department of Biomolecular Chemistry, University of Wisconsin Medical School, Madison Wisconsin, USA
| | - Kathleen Schell
- Comprehensive Cancer Center, University of Wisconsin Medical School, Madison, Wisconsin, USA
| | - Giuditta Angelini
- Department of Anesthesiology, University of Wisconsin Medical School, Madison, Wisconsin, USA
| | - Dawn Green
- Department of Anesthesiology, University of Wisconsin Medical School, Madison, Wisconsin, USA
| | - Arturo Guadarrama
- Department of Biomolecular Chemistry, University of Wisconsin Medical School, Madison Wisconsin, USA
| | - Usha Prabhu
- Department of Biomolecular Chemistry, University of Wisconsin Medical School, Madison Wisconsin, USA
| | - Douglas B. Coursin
- Department of Medicine, University of Wisconsin Medical School, Madison, Wisconsin, USA, Department of Anesthesiology, University of Wisconsin Medical School, Madison, Wisconsin, USA
| | - Kirk Hogan
- Department of Anesthesiology, University of Wisconsin Medical School, Madison, Wisconsin, USA
| | - Paul J. Bertics
- Department of Biomolecular Chemistry, University of Wisconsin Medical School, Madison Wisconsin, USA, Comprehensive Cancer Center, University of Wisconsin Medical School, Madison, Wisconsin, USA
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Solini A, Simeon V, Derosa L, Orlandi P, Rossi C, Fontana A, Galli L, Di Desidero T, Fioravanti A, Lucchesi S, Coltelli L, Ginocchi L, Allegrini G, Danesi R, Falcone A, Bocci G. Genetic interaction of P2X7 receptor and VEGFR-2 polymorphisms identifies a favorable prognostic profile in prostate cancer patients. Oncotarget 2016; 6:28743-54. [PMID: 26337470 PMCID: PMC4745689 DOI: 10.18632/oncotarget.4926] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 08/10/2015] [Indexed: 12/12/2022] Open
Abstract
VEGFR-2 and P2X7 receptor (P2X7R) have been described to stimulate the angiogenesis and inflammatory processes of prostate cancer. The present study has been performed to investigate the genetic interactions among VEGFR-2 and P2X7R SNPs and their correlation with overall survival (OS) in a population of metastatic prostate cancer patients. Analyses were performed on germline DNA obtained from blood samples and SNPs were investigated by real-time PCR technique. The survival dimensionality reduction (SDR) methodology was applied to investigate the genetic interaction between SNPs. One hundred patients were enrolled. The SDR software provided two genetic interaction profiles consisting of the combination between specific VEGFR-2 (rs2071559, rs11133360) and P2X7R (rs3751143, rs208294) genotypes. The median OS was 126 months (95% CI, 115.94–152.96) and 65.65 months (95% CI, 52.95–76.53) for the favorable and the unfavorable genetic profile, respectively (p < 0.0001). The genetic statistical interaction between VEGFR-2 (rs2071559, rs11133360) and P2X7R (rs3751143, rs208294) genotypes may identify a population of prostate cancer patients with a better prognosis.
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Affiliation(s)
- Anna Solini
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Vittorio Simeon
- Laboratory of Pre-Clinical and Translational Research, IRCCS - CROB Referral Cancer Center of Basilicata, Rionero in Vulture, Potenza, Italy
| | - Lisa Derosa
- Oncology Unit 2, University Hospital of Pisa, Pisa, Italy
| | - Paola Orlandi
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Chiara Rossi
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Andrea Fontana
- Oncology Unit 2, University Hospital of Pisa, Pisa, Italy
| | - Luca Galli
- Oncology Unit 2, University Hospital of Pisa, Pisa, Italy
| | - Teresa Di Desidero
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Anna Fioravanti
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Sara Lucchesi
- Division of Medical Oncology, Pontedera Hospital, Azienda USL of Pisa, Pontedera, Italy
| | - Luigi Coltelli
- Division of Medical Oncology, Pontedera Hospital, Azienda USL of Pisa, Pontedera, Italy
| | - Laura Ginocchi
- Division of Medical Oncology, Pontedera Hospital, Azienda USL of Pisa, Pontedera, Italy
| | - Giacomo Allegrini
- Division of Medical Oncology, Pontedera Hospital, Azienda USL of Pisa, Pontedera, Italy
| | - Romano Danesi
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | | | - Guido Bocci
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
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Migita K, Ozaki T, Shimoyama S, Yamada J, Nikaido Y, Furukawa T, Shiba Y, Egan TM, Ueno S. HSP90 Regulation of P2X7 Receptor Function Requires an Intact Cytoplasmic C-Terminus. Mol Pharmacol 2016; 90:116-26. [PMID: 27301716 PMCID: PMC11037447 DOI: 10.1124/mol.115.102988] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 06/10/2016] [Indexed: 12/19/2022] Open
Abstract
P2X7 receptors (P2X7Rs) are ATP-gated ion channels that display the unusual property of current facilitation during long applications of agonists. Here we show that facilitation disappears in chimeric P2X7Rs containing the C-terminus of the P2X2 receptor (P2X2R), and in a truncated P2X7R missing the cysteine-rich domain of the C-terminus. The chimeric and truncated receptors also show an apparent decreased permeability to N-methyl-d-glucamine(+) (NMDG(+)). The effects of genetic modification of the C-terminus on NMDG(+) permeability were mimicked by preapplication of the HSP90 antagonist geldanamycin to the wild-type receptor. Further, the geldanamycin decreased the shift in the reversal potential of the ATP-gated current measured under bi-ionic NMDG(+)/Na(+) condition without affecting the ability of the long application of agonist to facilitate current amplitude. Taken together, the results suggest that HSP90 may be essential for stabilization and function of P2X7Rs through an action on the cysteine-rich domain of the cytoplasmic the C-terminus.
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Affiliation(s)
- Keisuke Migita
- Department of Drug Informatics, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan (K.M.); Department of Neurophysiology (T.O., S.S., Y.N., T.F., Y.S., S.U.) and Research Center for Child Mental Development (T.O., S.S., S.U.), Hirosaki University Graduate School of Medicine, Hirosaki, Aomori, Japan; Department of Biomedical Sciences, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori, Japan (J.Y.); and Department of Pharmacology and Physiology, and The Center for Neuroscience, Saint Louis University School of Medicine, St. Louis, Missouri (T.M.E.)
| | - Taku Ozaki
- Department of Drug Informatics, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan (K.M.); Department of Neurophysiology (T.O., S.S., Y.N., T.F., Y.S., S.U.) and Research Center for Child Mental Development (T.O., S.S., S.U.), Hirosaki University Graduate School of Medicine, Hirosaki, Aomori, Japan; Department of Biomedical Sciences, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori, Japan (J.Y.); and Department of Pharmacology and Physiology, and The Center for Neuroscience, Saint Louis University School of Medicine, St. Louis, Missouri (T.M.E.)
| | - Shuji Shimoyama
- Department of Drug Informatics, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan (K.M.); Department of Neurophysiology (T.O., S.S., Y.N., T.F., Y.S., S.U.) and Research Center for Child Mental Development (T.O., S.S., S.U.), Hirosaki University Graduate School of Medicine, Hirosaki, Aomori, Japan; Department of Biomedical Sciences, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori, Japan (J.Y.); and Department of Pharmacology and Physiology, and The Center for Neuroscience, Saint Louis University School of Medicine, St. Louis, Missouri (T.M.E.)
| | - Junko Yamada
- Department of Drug Informatics, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan (K.M.); Department of Neurophysiology (T.O., S.S., Y.N., T.F., Y.S., S.U.) and Research Center for Child Mental Development (T.O., S.S., S.U.), Hirosaki University Graduate School of Medicine, Hirosaki, Aomori, Japan; Department of Biomedical Sciences, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori, Japan (J.Y.); and Department of Pharmacology and Physiology, and The Center for Neuroscience, Saint Louis University School of Medicine, St. Louis, Missouri (T.M.E.)
| | - Yoshikazu Nikaido
- Department of Drug Informatics, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan (K.M.); Department of Neurophysiology (T.O., S.S., Y.N., T.F., Y.S., S.U.) and Research Center for Child Mental Development (T.O., S.S., S.U.), Hirosaki University Graduate School of Medicine, Hirosaki, Aomori, Japan; Department of Biomedical Sciences, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori, Japan (J.Y.); and Department of Pharmacology and Physiology, and The Center for Neuroscience, Saint Louis University School of Medicine, St. Louis, Missouri (T.M.E.)
| | - Tomonori Furukawa
- Department of Drug Informatics, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan (K.M.); Department of Neurophysiology (T.O., S.S., Y.N., T.F., Y.S., S.U.) and Research Center for Child Mental Development (T.O., S.S., S.U.), Hirosaki University Graduate School of Medicine, Hirosaki, Aomori, Japan; Department of Biomedical Sciences, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori, Japan (J.Y.); and Department of Pharmacology and Physiology, and The Center for Neuroscience, Saint Louis University School of Medicine, St. Louis, Missouri (T.M.E.)
| | - Yuko Shiba
- Department of Drug Informatics, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan (K.M.); Department of Neurophysiology (T.O., S.S., Y.N., T.F., Y.S., S.U.) and Research Center for Child Mental Development (T.O., S.S., S.U.), Hirosaki University Graduate School of Medicine, Hirosaki, Aomori, Japan; Department of Biomedical Sciences, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori, Japan (J.Y.); and Department of Pharmacology and Physiology, and The Center for Neuroscience, Saint Louis University School of Medicine, St. Louis, Missouri (T.M.E.)
| | - Terrance M Egan
- Department of Drug Informatics, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan (K.M.); Department of Neurophysiology (T.O., S.S., Y.N., T.F., Y.S., S.U.) and Research Center for Child Mental Development (T.O., S.S., S.U.), Hirosaki University Graduate School of Medicine, Hirosaki, Aomori, Japan; Department of Biomedical Sciences, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori, Japan (J.Y.); and Department of Pharmacology and Physiology, and The Center for Neuroscience, Saint Louis University School of Medicine, St. Louis, Missouri (T.M.E.)
| | - Shinya Ueno
- Department of Drug Informatics, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan (K.M.); Department of Neurophysiology (T.O., S.S., Y.N., T.F., Y.S., S.U.) and Research Center for Child Mental Development (T.O., S.S., S.U.), Hirosaki University Graduate School of Medicine, Hirosaki, Aomori, Japan; Department of Biomedical Sciences, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori, Japan (J.Y.); and Department of Pharmacology and Physiology, and The Center for Neuroscience, Saint Louis University School of Medicine, St. Louis, Missouri (T.M.E.)
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29
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Monif M, Reid CA, Powell KL, Drummond KJ, O'Brien TJ, Williams DA. Interleukin-1β has trophic effects in microglia and its release is mediated by P2X7R pore. J Neuroinflammation 2016; 13:173. [PMID: 27364756 PMCID: PMC4929731 DOI: 10.1186/s12974-016-0621-8] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 06/10/2016] [Indexed: 11/21/2022] Open
Abstract
Background Enhanced expression of the purinergic P2X7 receptor (P2X7R) occurs in several neuroinflammatory conditions where increased microglial activation is a co-existing feature. P2X7 receptors can function either as a cation channel or, upon continued stimulation, a large pore. P2X7R-over-expression alone is sufficient to drive microglial activation and proliferation in a process that is P2X7R pore dependent, although the biological signaling pathway through which this occurs remains unclear. Once activated, microglia are known to release a number of bioactive substances that include the proinflammatory cytokine interleukin-1β (IL-1β). Previous studies have linked P2X7R stimulation to the processing and release of IL-1β, but whether the channel or pore state of P2X7R is predominant in driving IL-1β release is unknown and is a major aim of this study. In addition, we will determine whether IL-1β has trophic effects on surrounding microglia. Methods Electron microscopy and immunohistochemistry were used to delineate the sub-cellular localization of P2X7R and IL-1β in primary hippocampal rat cultures. FM1-43 fluorescent dye and confocal microscopy were used to quantify vesicular exocytosis from microglia expressing the pore-forming P2X7R versus a non-pore-forming point mutant, P2X7RG345Y. IL-1β in culture was quantified with an enzyme-linked immunosorbent assay (ELISA). IL-1β intracellular processing was blocked with inhibition of caspase 1 (with a synthetic peptide antagonist), and its extracellular form was neutralized with an IL-1β neutralizing antibody. Microglial activation and proliferation was quantified immunohistochemically with confocal microscopy. Results P2X7R and IL-1β were co-localized in lysosomes. Vesicular exocytosis was higher in microglia expressing the pore-forming P2X7R compared to those expressing the non-pore-forming mutant. There was increased IL-1β in cultures expressing the pore-forming P2X7R, and this proinflammatory cytokine was found to mediate the trophic effects of P2X7R pore in microglia. Inhibition of IL-1β production and function resulted in a significant decrease in P2X7R-mediated microglial activation and proliferation. Conclusions IL-1β is a mediator of microglial activation and proliferation, and its release/production is P2X7R pore dependent. Blockade of P2X7R pore could serve as a therapeutic target in alleviating the degree of inflammation seen in neurodegenerative and neoplastic conditions. Electronic supplementary material The online version of this article (doi:10.1186/s12974-016-0621-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Mastura Monif
- Department of Physiology, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Melbourne, Victoria, 3010, Australia.,The Department of Neurology, The Royal Melbourne Hospital, Parkville, Victoria, 3052, Australia
| | - Christopher A Reid
- Howard Florey Institute, The University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Kim L Powell
- Department of Medicine, Royal Melbourne Hospital, The University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Katherine J Drummond
- Department of Surgery, Royal Melbourne Hospital, The University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Terrence J O'Brien
- Department of Medicine, Royal Melbourne Hospital, The University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - David A Williams
- Department of Physiology, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Melbourne, Victoria, 3010, Australia.
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De Marchi E, Orioli E, Dal Ben D, Adinolfi E. P2X7 Receptor as a Therapeutic Target. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2016; 104:39-79. [PMID: 27038372 DOI: 10.1016/bs.apcsb.2015.11.004] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
P2X7 receptor is an ATP-gated cation channel that upon agonist interaction leads to cellular influx of Na(+) and Ca(2+) and efflux of K(+). P2X7 is expressed by a wide variety of cells and its activation mediates a large number of biological processes like inflammation, neuromodulation, cell death or cell proliferation and it has been associated to related pathological conditions including infectious, inflammatory, autoimmune, neurological, and musculoskeletal disorders and, in the last years, to cancer. This chapter describes structural features of P2X7, chemical properties of its agonist, antagonist, and allosteric modulators and summarizes recent advances on P2X7 receptor as therapeutic target in the aforementioned diseases. We also give an overview on recent literature suggesting that P2X7 single-nucleotide polymorphisms could be exploited as diagnostic biomarkers for the development of tailored therapies.
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Affiliation(s)
- Elena De Marchi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara, Ferrara, Italy
| | - Elisa Orioli
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara, Ferrara, Italy
| | - Diego Dal Ben
- School of Pharmacy, Medicinal Chemistry Unit, University of Camerino, Camerino, Italy
| | - Elena Adinolfi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara, Ferrara, Italy.
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31
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Fucikova J, Moserova I, Urbanova L, Bezu L, Kepp O, Cremer I, Salek C, Strnad P, Kroemer G, Galluzzi L, Spisek R. Prognostic and Predictive Value of DAMPs and DAMP-Associated Processes in Cancer. Front Immunol 2015; 6:402. [PMID: 26300886 PMCID: PMC4528281 DOI: 10.3389/fimmu.2015.00402] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 07/22/2015] [Indexed: 01/04/2023] Open
Abstract
It is now clear that human neoplasms form, progress, and respond to therapy in the context of an intimate crosstalk with the host immune system. In particular, accumulating evidence demonstrates that the efficacy of most, if not all, chemo- and radiotherapeutic agents commonly employed in the clinic critically depends on the (re)activation of tumor-targeting immune responses. One of the mechanisms whereby conventional chemotherapeutics, targeted anticancer agents, and radiotherapy can provoke a therapeutically relevant, adaptive immune response against malignant cells is commonly known as “immunogenic cell death.” Importantly, dying cancer cells are perceived as immunogenic only when they emit a set of immunostimulatory signals upon the activation of intracellular stress response pathways. The emission of these signals, which are generally referred to as “damage-associated molecular patterns” (DAMPs), may therefore predict whether patients will respond to chemotherapy or not, at least in some settings. Here, we review clinical data indicating that DAMPs and DAMP-associated stress responses might have prognostic or predictive value for cancer patients.
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Affiliation(s)
- Jitka Fucikova
- Sotio , Prague , Czech Republic ; Department of Immunology, 2nd Faculty of Medicine, University Hospital Motol, Charles University , Prague , Czech Republic
| | - Irena Moserova
- Sotio , Prague , Czech Republic ; Department of Immunology, 2nd Faculty of Medicine, University Hospital Motol, Charles University , Prague , Czech Republic
| | - Linda Urbanova
- Sotio , Prague , Czech Republic ; Department of Immunology, 2nd Faculty of Medicine, University Hospital Motol, Charles University , Prague , Czech Republic
| | - Lucillia Bezu
- Equipe 11 labellisée par la Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers , Paris , France ; U1138, INSERM , Paris , France ; Sorbonne Paris Cité, Université Paris Descartes , Paris , France ; Université Pierre et Marie Curie , Paris , France ; Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France
| | - Oliver Kepp
- Equipe 11 labellisée par la Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers , Paris , France ; U1138, INSERM , Paris , France ; Sorbonne Paris Cité, Université Paris Descartes , Paris , France ; Université Pierre et Marie Curie , Paris , France ; Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France
| | - Isabelle Cremer
- Sorbonne Paris Cité, Université Paris Descartes , Paris , France ; Université Pierre et Marie Curie , Paris , France ; Equipe 13, Centre de Recherche des Cordeliers , Paris , France
| | - Cyril Salek
- Institute of Hematology and Blood Transfusion , Prague , Czech Republic
| | - Pavel Strnad
- Department of Gynecology and Obsterics, 2nd Faculty of Medicine, University Hospital Motol, Charles University , Prague , Czech Republic
| | - Guido Kroemer
- Equipe 11 labellisée par la Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers , Paris , France ; U1138, INSERM , Paris , France ; Sorbonne Paris Cité, Université Paris Descartes , Paris , France ; Université Pierre et Marie Curie , Paris , France ; Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute , Villejuif , France ; Pôle de Biologie, Hopitâl Européen George Pompidou, AP-HP , Paris , France
| | - Lorenzo Galluzzi
- Equipe 11 labellisée par la Ligue Nationale contre le Cancer, Centre de Recherche des Cordeliers , Paris , France ; U1138, INSERM , Paris , France ; Sorbonne Paris Cité, Université Paris Descartes , Paris , France ; Université Pierre et Marie Curie , Paris , France ; Gustave Roussy Comprehensive Cancer Institute , Villejuif , France
| | - Radek Spisek
- Sotio , Prague , Czech Republic ; Department of Immunology, 2nd Faculty of Medicine, University Hospital Motol, Charles University , Prague , Czech Republic
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32
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Feng W, Wang L, Zheng G. Expression and function of P2 receptors in hematopoietic stem and progenitor cells. Stem Cell Investig 2015; 2:14. [PMID: 27358882 DOI: 10.3978/j.issn.2306-9759.2015.07.01] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 05/28/2015] [Indexed: 12/15/2022]
Abstract
Nucleotides have unambiguously emerged as a family of mediators of intercellular communication, which bind to a class of plasma membrane receptors, P2 receptors, to trigger intercellular signaling. P2 receptors can be further divided into P2X and P2Y subfamilies based on structure and function. Different hematopoietic cells express diverse spectrums of P2 receptors at different levels, including hematopoietic stem and progenitor cells (HSPCs). Extracellular adenosine triphosphate (ATP) exerts different effects on HSPCs, regulating cell proliferation, differentiation, migration, and chemotaxis, release of cytokines or lysosomal constituents, and generation of reactive oxygen or nitrogen species. The relationship between abnormal P2 receptor function and human diseases attracts more and more attention. This review summarizes the expression and function of P2 receptors in HSPCs and the relationship to hematopoietic diseases.
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Affiliation(s)
- Wenli Feng
- 1 State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Disease Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300020, China ; 2 Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing 100730, China
| | - Lina Wang
- 1 State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Disease Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300020, China ; 2 Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing 100730, China
| | - Guoguang Zheng
- 1 State Key Laboratory of Experimental Hematology, Institute of Hematology & Blood Disease Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Tianjin 300020, China ; 2 Center for Stem Cell Medicine, Chinese Academy of Medical Sciences, Beijing 100730, China
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Lewandowska M, Garczyńska P, Jędrychowska-Dańska K, Kopczyńska P, Masłowska A, Witas H. Frequency of P2RX7 A1513C and TLR2 -196 to -174 ins/del in healthy Polish individuals. Int J Immunogenet 2015; 42:195-9. [PMID: 25726710 DOI: 10.1111/iji.12185] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 01/30/2015] [Accepted: 02/02/2015] [Indexed: 02/06/2023]
Abstract
Polymorphisms within genes coding innate immune response proteins are involved in genetic susceptibility to various conditions. We investigated the frequency of P2RX7 A1513C and TLR2 -196 to -174 ins/del polymorphisms in healthy Polish population. Frequency of minor alleles was relatively similar to the pattern presented by Caucasian populations while it differed significantly when compared to non-European populations, which could be a result of variable selection pressure put upon studied alleles or hindered gene flow between populations.
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Affiliation(s)
- M Lewandowska
- Department of Molecular Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University, Lodz, Poland
| | - P Garczyńska
- Department of Molecular Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University, Lodz, Poland
| | - K Jędrychowska-Dańska
- Department of Molecular Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University, Lodz, Poland
| | - P Kopczyńska
- Department of Molecular Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University, Lodz, Poland
| | - A Masłowska
- Department of Molecular Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University, Lodz, Poland
| | - H Witas
- Department of Molecular Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University, Lodz, Poland
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Hofman P, Cherfils-Vicini J, Bazin M, Ilie M, Juhel T, Hébuterne X, Gilson E, Schmid-Alliana A, Boyer O, Adriouch S, Vouret-Craviari V. Genetic and pharmacological inactivation of the purinergic P2RX7 receptor dampens inflammation but increases tumor incidence in a mouse model of colitis-associated cancer. Cancer Res 2015; 75:835-45. [PMID: 25564520 DOI: 10.1158/0008-5472.can-14-1778] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Colitis-associated cancer (CAC) is a complication of inflammatory bowel disease (IBD). Binding of extracellular ATP to the purinergic receptor P2RX7 has emerged as a critical event in controlling intestinal inflammation, acting to limit elevation of proinflammatory mast cells and cytokines and promote survival of regulatory T cells (Treg) and enteric neurons. In this study, we investigated the effect of P2RX7 blockade in an established mouse model of CAC. Using genetic and pharmacologic tools, we found unexpectedly that while P2RX7 mediated inflammatory responses, it also acted at an early time to suppress CAC development. P2RX7 blockade enhanced proliferation of intestinal epithelial cells and protected them from apoptosis. The proliferative effects of P2RX7 blockade were associated with an increased production of TGFβ1 that was sufficient to stimulate the proliferation of intestinal epithelial cells. Finally, P2RX7 blockade also altered immune cell infiltration and promoted Treg accumulation within lesions of the digestive system. Taken together, our findings reveal an unexpected role for P2RX7 in preventing CAC, suggesting cautions in the use of P2RX7 inhibitors to treat IBD given the possibility of increasing risks CAC as a result.
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Affiliation(s)
- Paul Hofman
- Institute for Research on Cancer and Aging, Nice, France; IRCAN U1081 UMR CNRS 7284, Nice Cedex, France. University of Nice-Sophia Antipolis, Nice, France. Laboratory of Clinical and Experimental Pathology and Biobank, Pasteur Hospital, Nice, France. Centre Antoine Lacassagne, Nice, France
| | - Julien Cherfils-Vicini
- Institute for Research on Cancer and Aging, Nice, France; IRCAN U1081 UMR CNRS 7284, Nice Cedex, France. University of Nice-Sophia Antipolis, Nice, France. Centre Antoine Lacassagne, Nice, France
| | - Marie Bazin
- Institute for Research on Cancer and Aging, Nice, France; IRCAN U1081 UMR CNRS 7284, Nice Cedex, France. University of Nice-Sophia Antipolis, Nice, France. Centre Antoine Lacassagne, Nice, France
| | - Marius Ilie
- Institute for Research on Cancer and Aging, Nice, France; IRCAN U1081 UMR CNRS 7284, Nice Cedex, France. University of Nice-Sophia Antipolis, Nice, France. Laboratory of Clinical and Experimental Pathology and Biobank, Pasteur Hospital, Nice, France. Centre Antoine Lacassagne, Nice, France
| | - Thierry Juhel
- Institute for Research on Cancer and Aging, Nice, France; IRCAN U1081 UMR CNRS 7284, Nice Cedex, France. University of Nice-Sophia Antipolis, Nice, France. Centre Antoine Lacassagne, Nice, France
| | - Xavier Hébuterne
- Institute for Research on Cancer and Aging, Nice, France; IRCAN U1081 UMR CNRS 7284, Nice Cedex, France. University of Nice-Sophia Antipolis, Nice, France. Laboratory of Gastroenterology, Archet II Hospital, Nice, France
| | - Eric Gilson
- Institute for Research on Cancer and Aging, Nice, France; IRCAN U1081 UMR CNRS 7284, Nice Cedex, France. University of Nice-Sophia Antipolis, Nice, France. Centre Antoine Lacassagne, Nice, France. Department of Medical Genetics, Archet 2 Hospital, CHU of Nice, Nice, France
| | - Annie Schmid-Alliana
- University of Nice-Sophia Antipolis, Nice, France. iBV, UMR7277 CNRS-UMR1091 INSERM, Nice, France
| | - Olivier Boyer
- INSERM U905, Rouen, France. Institute for Research and Innovation in Biomedicine (IRIB), Normandy University, Rouen, France
| | - Sahil Adriouch
- INSERM U905, Rouen, France. Institute for Research and Innovation in Biomedicine (IRIB), Normandy University, Rouen, France
| | - Valérie Vouret-Craviari
- Institute for Research on Cancer and Aging, Nice, France; IRCAN U1081 UMR CNRS 7284, Nice Cedex, France. University of Nice-Sophia Antipolis, Nice, France. Centre Antoine Lacassagne, Nice, France.
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Roger S, Jelassi B, Couillin I, Pelegrin P, Besson P, Jiang LH. Understanding the roles of the P2X7 receptor in solid tumour progression and therapeutic perspectives. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1848:2584-602. [PMID: 25450340 DOI: 10.1016/j.bbamem.2014.10.029] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Revised: 10/13/2014] [Accepted: 10/20/2014] [Indexed: 01/05/2023]
Abstract
P2X7 is an intriguing ionotropic receptor for which the activation by extracellular ATP induces rapid inward cationic currents and intracellular signalling pathways associated with numerous physiological processes such as the induction of the inflammatory cascade, the survival and proliferation of cells. In contrast, long-term stimulation of P2X7 is generally associated with membrane permeabilisation and cell death. Recently, P2X7 has attracted great attention in the cancer field, and particularly in the neoplastic transformation and the progression of solid tumours. A growing number of studies were published; however they often appeared contradictory in their results and conclusions. As such, the involvement of P2X7 in the oncogenic process remains unclear so far. The present review aims to discuss the current knowledge and hypotheses on the involvement of the P2X7 receptor in the development and progression of solid tumours, and highlight the different aspects that require further clarification in order to decipher whether P2X7 could be considered as a cancer biomarker or as a target for pharmacological intervention. This article is part of a Special Issue entitled: Membrane channels and transporters in cancers.
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Affiliation(s)
- Sébastien Roger
- Inserm UMR1069 Nutrition, Croissance et Cancer, Université François-Rabelais de Tours, 10 Boulevard Tonnellé, 37032 Tours, France; Département de Physiologie Animale, UFR Sciences et Techniques, Université François-Rabelais de Tours, Avenue Monge, 37200 Tours, France.
| | - Bilel Jelassi
- Inserm UMR1069 Nutrition, Croissance et Cancer, Université François-Rabelais de Tours, 10 Boulevard Tonnellé, 37032 Tours, France
| | - Isabelle Couillin
- UMR CNRS 7355 Experimental and Molecular Immunology and Neurogenetics, Université d'Orléans, 3B rue de la Ferollerie, F-45071 Orléans, France
| | - Pablo Pelegrin
- Inflammation and Experimental Surgery Research Unit, CIBERehd, Clinical University Hospital "Virgen de la Arrixaca", Murcia's BioHealth Research Institute IMIB-Arrixaca, Carretera Cartagena-Madrid s/n, 30120 Murcia, Spain
| | - Pierre Besson
- Inserm UMR1069 Nutrition, Croissance et Cancer, Université François-Rabelais de Tours, 10 Boulevard Tonnellé, 37032 Tours, France
| | - Lin-Hua Jiang
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom
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P2X7 receptors are a potential novel target for anti-glioma therapies. JOURNAL OF INFLAMMATION-LONDON 2014. [DOI: 10.1186/s12950-014-0025-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Burnstock G, Di Virgilio F. Purinergic signalling and cancer. Purinergic Signal 2014; 9:491-540. [PMID: 23797685 DOI: 10.1007/s11302-013-9372-5] [Citation(s) in RCA: 234] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2013] [Accepted: 06/06/2013] [Indexed: 01/24/2023] Open
Abstract
Receptors for extracellular nucleotides are widely expressed by mammalian cells. They mediate a large array of responses ranging from growth stimulation to apoptosis, from chemotaxis to cell differentiation and from nociception to cytokine release, as well as neurotransmission. Pharma industry is involved in the development and clinical testing of drugs selectively targeting the different P1 nucleoside and P2 nucleotide receptor subtypes. As described in detail in the present review, P2 receptors are expressed by all tumours, in some cases to a very high level. Activation or inhibition of selected P2 receptor subtypes brings about cancer cell death or growth inhibition. The field has been largely neglected by current research in oncology, yet the evidence presented in this review, most of which is based on in vitro studies, although with a limited amount from in vivo experiments and human studies, warrants further efforts to explore the therapeutic potential of purinoceptor targeting in cancer.
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38
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miR-34a expands myeloid-derived suppressor cells via apoptosis inhibition. Exp Cell Res 2014; 326:259-66. [DOI: 10.1016/j.yexcr.2014.04.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2014] [Revised: 03/21/2014] [Accepted: 04/16/2014] [Indexed: 01/08/2023]
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Non-synonymous single nucleotide polymorphisms in the P2X receptor genes: association with diseases, impact on receptor functions and potential use as diagnosis biomarkers. Int J Mol Sci 2014; 15:13344-71. [PMID: 25079442 PMCID: PMC4159798 DOI: 10.3390/ijms150813344] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 07/10/2014] [Accepted: 07/14/2014] [Indexed: 12/17/2022] Open
Abstract
P2X receptors are Ca2+-permeable cationic channels in the cell membranes, where they play an important role in mediating a diversity of physiological and pathophysiological functions of extracellular ATP. Mammalian cells express seven P2X receptor genes. Single nucleotide polymorphisms (SNPs) are widespread in the P2RX genes encoding the human P2X receptors, particularly the human P2X7 receptor. This article will provide an overview of the non-synonymous SNPs (NS-SNPs) that have been associated with or implicated in altering the susceptibility to pathologies or disease conditions, and discuss the consequences of the mutations resulting from such NS-SNPs on the receptor functions. Disease-associated NS-SNPs in the P2RX genes have been valuable in understanding the disease etiology and the receptor function, and are promising as biomarkers to be used for the diagnosis and development of stratified therapeutics.
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40
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Shoji KF, Sáez PJ, Harcha PA, Aguila HL, Sáez JC. Pannexin1 channels act downstream of P2X 7 receptors in ATP-induced murine T-cell death. Channels (Austin) 2014; 8:142-56. [PMID: 24590064 DOI: 10.4161/chan.28122] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Death of murine T cells induced by extracellular ATP is mainly triggered by activation of purinergic P2X 7 receptors (P2X 7Rs). However, a link between P2X 7Rs and pannexin1 (Panx1) channels, which are non-selective, has been recently demonstrated in other cell types. In this work, we characterized the expression and cellular distribution of pannexin family members (Panxs 1, 2 and 3) in isolated T cells. Panx1 was the main pannexin family member clearly detected in both helper (CD4+) and cytotoxic (CD8+) T cells, whereas low levels of Panx2 were found in both T-cell subsets. Using pharmacological and genetic approaches, Panx1 channels were found to mediate most ATP-induced ethidium uptake since this was drastically reduced by Panx1 channel blockers (10Panx1, Probenecid and low carbenoxolone concentration) and absent in T cells derived from Panx1-/- mice. Moreover, electrophysiological measurements in wild-type CD4+ cells treated with ATP unitary current events and pharmacological sensitivity compatible with Panx1 channels were found. In addition, ATP release from T cells treated with 4Br-A23187, a calcium ionophore, was completely blocked with inhibitors of both connexin hemichannels and Panx1 channels. Panx1 channel blockers drastically reduced the ATP-induced T-cell mortality, indicating that Panx1 channels mediate the ATP-induced T-cell death. However, mortality was not reduced in T cells of Panx1-/- mice, in which levels of P2X 7Rs and ATP-induced intracellular free Ca2+ responses were enhanced suggesting that P2X 7Rs take over Panx1 channels lose-function in mediating the onset of cell death induced by extracellular ATP.
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Affiliation(s)
- Kenji F Shoji
- Departamento de Fisiología; Pontificia Universidad Católica de Chile; Santiago, Chile
| | - Pablo J Sáez
- Departamento de Fisiología; Pontificia Universidad Católica de Chile; Santiago, Chile
| | - Paloma A Harcha
- Departamento de Fisiología; Pontificia Universidad Católica de Chile; Santiago, Chile
| | - Hector L Aguila
- Department of Immunology; University of Connecticut Health Center; Farmington, CT USA
| | - Juan C Sáez
- Departamento de Fisiología; Pontificia Universidad Católica de Chile; Santiago, Chile; Instituto Milenio; Centro Interdisciplinario de Neurociencias de Valparaíso; Valparaíso, Chile
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41
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Vergani A, Tezza S, Fotino C, Visner G, Pileggi A, Chandraker A, Fiorina P. The purinergic system in allotransplantation. Am J Transplant 2014; 14:507-14. [PMID: 24433446 DOI: 10.1111/ajt.12567] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 10/31/2013] [Accepted: 10/31/2013] [Indexed: 01/25/2023]
Abstract
The purine nucleotide adenosine triphosphate (ATP) is a universal source of energy for any intracellular reaction. Under specific physiological or pathological conditions, ATP can be released into extracellular spaces, where it binds and activates the purinergic receptors system (i.e. P2X, P2Y and P1 receptors). Extracellular ATP (eATP) binds to P2X or P2Y receptors in immune cells, where it mediates proliferation, chemotaxis, cytokine release, antigen presentation and cytotoxicity. eATP is then hydrolyzed by ectonucleotidases into adenosine diphosphate (ADP), which activates P2Y receptors. Ectonucleotidases also hydrolyze ADP to adenosine monophosphate and adenosine, which binds P1 receptors. In contrast to P2X and P2Y receptors, P1 receptors exert mainly an inhibitory effect on the immune response. In transplantation, a prominent role has been demonstrated for the eATP/P2X7R axis; the targeting of this pathway in fact is associated with long-term graft function and reduced graft versus host disease severity in murine models. Novel P2X receptor inhibitors are available for clinical use and are under assessment as immunomodulatory agents. In this review, we will focus on the relevance of the purinergic system and on the potential benefits of targeting this system in allograft rejection and tolerance.
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Affiliation(s)
- A Vergani
- Nephrology Division, Boston Children's Hospital, Harvard Medical School, Boston, MA; Department of Medicine, San Raffaele Scientific Institute, Milan, Italy
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Sava GP, Speedy HE, Houlston RS. Candidate gene association studies and risk of chronic lymphocytic leukemia: a systematic review and meta-analysis. Leuk Lymphoma 2014; 55:160-7. [PMID: 23647060 DOI: 10.3109/10428194.2013.800197] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
To evaluate the contribution of association studies of candidate polymorphisms to inherited predisposition to chronic lymphocytic leukemia (CLL), we conducted a systematic review and meta-analysis of published case-control studies. We identified 36 studies which reported on polymorphic variation in 19 genes and CLL risk. Out of the 23 polymorphic variants, significant associations (p < 0.05) were seen in pooled analyses for only four variants: MDR1, rs1045642; LTA, rs2239704; CD38, rs6449182; and IFNGR1, rs4896243. These findings should be interpreted cautiously, as the estimated false positive report probabilities (FPRPs) for each association were not noteworthy (i.e. FPRP > 0.2). While studies of candidate polymorphisms may be an attractive means of identifying risk factors for CLL, the limited power of published studies to demonstrate statistically significant associations makes it essential that future analyses be based on sample sizes well-powered to identify variants having modest effects on CLL risk.
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MESH Headings
- Apoptosis/genetics
- Carcinogens/metabolism
- DNA Repair/genetics
- Genetic Association Studies
- Genetic Predisposition to Disease
- Humans
- Immunity
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/immunology
- Leukemia, Lymphocytic, Chronic, B-Cell/metabolism
- Odds Ratio
- Polymorphism, Genetic
- Risk
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Affiliation(s)
- Georgina P Sava
- Division of Genetics and Epidemiology, Institute of Cancer Research , Sutton, Surrey , UK
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Identification of interconnected markers for T-cell acute lymphoblastic leukemia. BIOMED RESEARCH INTERNATIONAL 2013; 2013:210253. [PMID: 23956970 PMCID: PMC3727179 DOI: 10.1155/2013/210253] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Accepted: 06/04/2013] [Indexed: 12/11/2022]
Abstract
T-cell acute lymphoblastic leukemia (T-ALL) is a complex disease, resulting from proliferation of differentially arrested immature T cells. The molecular mechanisms and the genes involved in the generation of T-ALL remain largely undefined. In this study, we propose a set of genes to differentiate individuals with T-ALL from the nonleukemia/healthy ones and genes that are not differential themselves but interconnected with highly differentially expressed ones. We provide new suggestions for pathways involved in the cause of T-ALL and show that network-based classification techniques produce fewer genes with more meaningful and successful results than expression-based approaches. We have identified 19 significant subnetworks, containing 102 genes. The classification/prediction accuracies of subnetworks are considerably high, as high as 98%. Subnetworks contain 6 nondifferentially expressed genes, which could potentially participate in pathogenesis of T-ALL. Although these genes are not differential, they may serve as biomarkers if their loss/gain of function contributes to generation of T-ALL via SNPs. We conclude that transcription factors, zinc-ion-binding proteins, and tyrosine kinases are the important protein families to trigger T-ALL. These potential disease-causing genes in our subnetworks may serve as biomarkers, alternative to the traditional ones used for the diagnosis of T-ALL, and help understand the pathogenesis of the disease.
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Jiang LH, Baldwin JM, Roger S, Baldwin SA. Insights into the Molecular Mechanisms Underlying Mammalian P2X7 Receptor Functions and Contributions in Diseases, Revealed by Structural Modeling and Single Nucleotide Polymorphisms. Front Pharmacol 2013; 4:55. [PMID: 23675347 PMCID: PMC3646254 DOI: 10.3389/fphar.2013.00055] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Accepted: 04/11/2013] [Indexed: 12/13/2022] Open
Abstract
The mammalian P2X7 receptors (P2X7Rs), a member of the ionotropic P2X receptor family with distinctive functional properties, play an important part in mediating extracellular ATP signaling in health and disease. A clear delineation of the molecular mechanisms underlying the key receptor properties, such as ATP-binding, ion permeation, and large pore formation of the mammalian P2X7Rs, is still lacking, but such knowledge is crucial for a better understanding of their physiological functions and contributions in diseases and for development of therapeutics. The recent breakthroughs in determining the atomic structures of the zebrafish P2X4.1R in the closed and ATP-bound open states have provided the long-awaited structural information. The human P2RX7 gene is abundant with non-synonymous single nucleotide polymorphisms (NS-SNPs), which generate a repertoire of human P2X7Rs with point mutations. Characterizations of the NS-SNPs identified in patients of various disease conditions and the resulting mutations have informed previously unknown molecular mechanisms determining the mammalian P2X7R functions and diseases. In this review, we will discuss the new insights into such mechanisms provided by structural modeling and recent functional and genetic linkage studies of NS-SNPs.
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Affiliation(s)
- Lin-Hua Jiang
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds Leeds, UK
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45
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Mishra A. New insights of P2X7 receptor signaling pathway in alveolar functions. J Biomed Sci 2013; 20:26. [PMID: 23634990 PMCID: PMC3652760 DOI: 10.1186/1423-0127-20-26] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Accepted: 04/29/2013] [Indexed: 12/20/2022] Open
Abstract
Purinergic P2X7 receptor (P2X7R), an ATP-gated cation channel, is unique among all other family members because of its ability to respond to various stimuli and to modulate pro-inflammatory signaling. The activation of P2X7R in immune cells is absolutely required for mature interleukin -1beta (IL-1beta) and IL-18 production and release. Lung alveoli are lined by the structural alveolar epithelial type I (AEC I) and alveolar epithelial type II cells (AEC II). AEC I plays important roles in alveolar barrier protection and fluid homeostasis whereas AEC II synthesizes and secrete surfactant and prevents alveoli from collapse. Earlier studies indicated that purinergic P2X7 receptors were specifically expressed in AEC I. However, their implication in alveolar functions has not been explored. This paper reviews two important signaling pathways of P2X7 receptors in surfactant homeostatsis and Acute Lung Injury (ALI). Thus, P2X7R resides at the critical nexus of alveolar pathophysiology.
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Affiliation(s)
- Amarjit Mishra
- National Institute of Health, 10 Center Dr, Bldg No, 10, Bethesda, MD 20892, USA.
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46
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Wesselius A, Bours MJL, Henriksen Z, Syberg S, Petersen S, Schwarz P, Jørgensen NR, van Helden S, Dagnelie PC. Association of P2X7 receptor polymorphisms with bone mineral density and osteoporosis risk in a cohort of Dutch fracture patients. Osteoporos Int 2013; 24:1235-46. [PMID: 22776862 PMCID: PMC3604588 DOI: 10.1007/s00198-012-2059-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Accepted: 06/13/2012] [Indexed: 10/29/2022]
Abstract
UNLABELLED The P2X7 receptor is thought to be involved in bone physiology in a pro-osteogenic manner. Therefore, we examined associations between genetic variations in the P2X7 receptor gene and bone mineral density (BMD). We found an association between four non-synonymous polymorphism of the human P2X7 receptor and the risk of osteoporosis. INTRODUCTION The purpose of this study was to determine whether genetic variation in the P2X7 receptor gene (P2RX7) is associated with decreased BMD and risk of osteoporosis in fracture patients. METHODS Six hundred ninety women and 231 men aged≥50 years were genotyped for 15 non-synonymous P2RX7 SNPs. BMD was measured at the total hip, lumbar spine and femoral neck. RESULTS Four non-synonymous SNPs were associated with BMD. The Ala348Thr gain-of-function polymorphism was associated with increased BMD values at the lumbar spine (p=0.012). Decreased hip BMD values were associated with two loss-of-function SNPs in the P2RX7, i.e., in subjects homozygous for the Glu496Ala polymorphism as well as in subjects carrying at least one variant allele of the Gly150Arg polymorphism (p=0.018 and p=0.011; respectively). In men, we showed that subjects either heterozygous or homozygous for the Gln460Arg gain-of-function polymorphism in the P2RX7 had a significantly 40% decrease in risk of a lower T-score value (OR=0.58 [95%CI, 0.33-1.00]). CONCLUSION Thus, genetic aberrations of P2X7R function are associated with lower BMD and increased osteoporosis risk. Therefore, detection of non-synonymous SNPs within the P2RX7 might be useful for osteoporosis risk estimation at an early stage, potentially enabling better osteoporosis prevention and treatment.
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Affiliation(s)
- A Wesselius
- Department of Epidemiology, School for Public Health and Primary Care (CAPHRI), Maastricht University, Peter Debyeplein 1, P.O. Box 616, 6200, MD, Maastricht, The Netherlands.
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47
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Srivastava S, Tsongalis GJ, Kaur P. Recent advances in microRNA-mediated gene regulation in chronic lymphocytic leukemia. Clin Biochem 2013; 46:901-8. [PMID: 23518313 DOI: 10.1016/j.clinbiochem.2013.03.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Revised: 03/01/2013] [Accepted: 03/08/2013] [Indexed: 01/04/2023]
Abstract
Chronic lymphocytic leukemia (CLL) is the most common leukemia in the western world and is a very clinically heterogeneous disease for which better prognostic biomarkers are needed. Current prognostic markers exhibit both biological and technical limitations. MicroRNAs (miRNAs) are small endogenous, non-coding 22-nucleotide regulatory RNAs that have been shown to modulate hematopoietic lineage differentiation and play important gene-regulatory roles in disease processes. In this manuscript, we review miRNA biology and the association of specific miRNAs with CLL.
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Affiliation(s)
- Swati Srivastava
- Department of Pathology, Geisel School of Medicine at Dartmouth, Dartmouth Hitchcock Medical Center, Norris Cotton Cancer Center, Lebanon, NH 03756, USA
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Xu XJ, Boumechache M, Robinson LE, Marschall V, Gorecki DC, Masin M, Murrell-Lagnado RD. Splice variants of the P2X7 receptor reveal differential agonist dependence and functional coupling with pannexin-1. J Cell Sci 2012; 125:3776-89. [PMID: 22553206 DOI: 10.1242/jcs.099374] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
P2X7 receptors function as ATP-gated cation channels but also interact with other proteins as part of a larger signalling complex to mediate a variety of downstream responses that are dependent upon the cell type in which they are expressed. Receptor-mediated membrane permeabilization to large molecules precedes the induction of cell death, but remains poorly understood. The mechanisms that underlie differential sensitivity to NAD are also unknown. By studying alternative variants of the mouse P2X7 receptor we show that sensitivity to NAD is mediated through the P2X7k variant, which has a much more restricted distribution than the P2X7a receptor, but is expressed in T lymphocytes. The altered N-terminus and TM1 of the P2X7k receptor enhances the stability of the active state of this variant compared with P2X7a, thereby increasing the efficacy of NAD-dependent ADP ribosylation as measured by ethidium uptake, a rise in intracellular Ca(2+) and the activation of inward currents. Co-expression of P2X7k and P2X7a receptors reduced NAD sensitivity. P2X7k-receptor-mediated ethidium uptake was also triggered by much lower BzATP concentrations and was insensitive to the P451L single nucleotide polymorphism. P2X7k-receptor-mediated ethidium uptake occurred independently of pannexin-1 suggesting a pathway intrinsic to the receptor. Only for the P2X7aL451 receptor could we resolve a component of dye uptake dependent upon pannexin-1. Signalling occurred downstream of the activation of caspases rather than involving direct cross talk between the channels. However, an in situ proximity assay showed close association between P2X7 receptors and pannexin-1, which would facilitate ATP efflux through pannexin-1 acting in an autocrine manner.
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Affiliation(s)
- Xing Jian Xu
- Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge CB2 1PD, UK
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Kaczmarek-Hájek K, Lörinczi E, Hausmann R, Nicke A. Molecular and functional properties of P2X receptors--recent progress and persisting challenges. Purinergic Signal 2012; 8:375-417. [PMID: 22547202 PMCID: PMC3360091 DOI: 10.1007/s11302-012-9314-7] [Citation(s) in RCA: 147] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Accepted: 10/18/2011] [Indexed: 12/16/2022] Open
Abstract
ATP-gated P2X receptors are trimeric ion channels that assemble as homo- or heteromers from seven cloned subunits. Transcripts and/or proteins of P2X subunits have been found in most, if not all, mammalian tissues and are being discovered in an increasing number of non-vertebrates. Both the first crystal structure of a P2X receptor and the generation of knockout (KO) mice for five of the seven cloned subtypes greatly advanced our understanding of their molecular and physiological function and their validation as drug targets. This review summarizes the current understanding of the structure and function of P2X receptors and gives an update on recent developments in the search for P2X subtype-selective ligands. It also provides an overview about the current knowledge of the regulation and modulation of P2X receptors on the cellular level and finally on their physiological roles as inferred from studies on KO mice.
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Affiliation(s)
- Karina Kaczmarek-Hájek
- Max Planck Institute for Experimental Medicine, Hermann Rein Str. 3, 37075, Göttingen, Germany
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Jørgensen NR, Husted LB, Skarratt KK, Stokes L, Tofteng CL, Kvist T, Jensen JEB, Eiken P, Brixen K, Fuller S, Clifton-Bligh R, Gartland A, Schwarz P, Langdahl BL, Wiley JS. Single-nucleotide polymorphisms in the P2X7 receptor gene are associated with post-menopausal bone loss and vertebral fractures. Eur J Hum Genet 2012; 20:675-81. [PMID: 22274585 DOI: 10.1038/ejhg.2011.253] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The purinergic P2X7 receptor has a major role in the regulation of osteoblast and osteoclast activity and changes in receptor function may therefore affect bone mass in vivo. The aim of this study was to determine the association of non-synonymous single-nucleotide polymorphisms in the P2RX7 gene to bone mass and fracture incidence in post-menopausal women. A total of 1694 women (aged 45-58) participating in the Danish Osteoporosis Prevention Study were genotyped for 12 functional P2X7 receptor variants. Bone mineral density was determined at baseline and after 10 years. In addition, vertebral fracture incidence was documented at 10 years. We found that the rate of bone loss was clearly associated with the Arg307Gln amino acid substitution such that individuals heterozygous for this polymorphism had a 40% increased rate of bone loss. Furthermore, individuals carrying the Ile568Asn variant allele had increased bone loss. In contrast, the Gln460Arg polymorphism was associated with protection against bone loss. The Ala348Thr polymorphism was associated with a lower vertebral fracture incidence 10 years after menopause. Finally, we developed a risk model, which integrated P2RX7 genotypes. Using this model, we found a clear association between the low-risk (high-P2X7 function) alleles and low rate of bone loss. Conversely, high-risk (reduced P2X7 function) alleles were associated with a high rate of bone loss. In conclusion, an association was demonstrated between variants that reduce P2X7 receptor function and increased rate of bone loss. These data support that the P2X7 receptor is important in regulation of bone mass.
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Affiliation(s)
- Niklas R Jørgensen
- Research Center for Ageing and Osteoporosis, Department of Clinical Biochemistry, Glostrup University Hospital, Glostrup, Denmark.
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