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Strohm AO, Johnston C, Hernady E, Marples B, O'Banion MK, Majewska AK. Cranial irradiation disrupts homeostatic microglial dynamic behavior. J Neuroinflammation 2024; 21:82. [PMID: 38570852 PMCID: PMC10993621 DOI: 10.1186/s12974-024-03073-z] [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: 12/18/2023] [Accepted: 03/22/2024] [Indexed: 04/05/2024] Open
Abstract
Cranial irradiation causes cognitive deficits that are in part mediated by microglia, the resident immune cells of the brain. Microglia are highly reactive, exhibiting changes in shape and morphology depending on the function they are performing. Additionally, microglia processes make dynamic, physical contacts with different components of their environment to monitor the functional state of the brain and promote plasticity. Though evidence suggests radiation perturbs homeostatic microglia functions, it is unknown how cranial irradiation impacts the dynamic behavior of microglia over time. Here, we paired in vivo two-photon microscopy with a transgenic mouse model that labels cortical microglia to follow these cells and determine how they change over time in cranial irradiated mice and their control littermates. We show that a single dose of 10 Gy cranial irradiation disrupts homeostatic cortical microglia dynamics during a 1-month time course. We found a lasting loss of microglial cells following cranial irradiation, coupled with a modest dysregulation of microglial soma displacement at earlier timepoints. The homogeneous distribution of microglia was maintained, suggesting microglia rearrange themselves to account for cell loss and maintain territorial organization following cranial irradiation. Furthermore, we found cranial irradiation reduced microglia coverage of the parenchyma and their surveillance capacity, without overtly changing morphology. Our results demonstrate that a single dose of radiation can induce changes in microglial behavior and function that could influence neurological health. These results set the foundation for future work examining how cranial irradiation impacts complex cellular dynamics in the brain which could contribute to the manifestation of cognitive deficits.
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Affiliation(s)
- Alexandra O Strohm
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA
| | - Carl Johnston
- Department of Pediatrics, University of Rochester Medical Center, Rochester, NY, 14642, USA
| | - Eric Hernady
- Department of Radiation Oncology, University of Rochester Medical Center, Rochester, NY, 14642, USA
| | - Brian Marples
- Department of Radiation Oncology, University of Rochester Medical Center, Rochester, NY, 14642, USA
| | - M Kerry O'Banion
- Department of Neuroscience, University of Rochester Medical Center, Rochester, NY, 14642, USA
- Del Monte Institute for Neuroscience, University of Rochester Medical Center, Rochester, NY, 14642, USA
| | - Ania K Majewska
- Department of Neuroscience, University of Rochester Medical Center, Rochester, NY, 14642, USA.
- Del Monte Institute for Neuroscience, University of Rochester Medical Center, Rochester, NY, 14642, USA.
- Center for Visual Science, University of Rochester Medical Center, Rochester, NY, 14642, USA.
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Raber J, Holden S, Kessler K, Glaeser B, McQuesten C, Chaudhari M, Stenzel F, Lenarczyk M, Leonard SW, Morré J, Choi J, Kronenberg A, Borg A, Kwok A, Stevens JF, Olsen C, Willey JS, Bobe G, Minnier J, Baker JE. Effects of photon irradiation in the presence and absence of hindlimb unloading on the behavioral performance and metabolic pathways in the plasma of Fischer rats. Front Physiol 2024; 14:1316186. [PMID: 38260101 PMCID: PMC10800373 DOI: 10.3389/fphys.2023.1316186] [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: 10/10/2023] [Accepted: 12/11/2023] [Indexed: 01/24/2024] Open
Abstract
Introduction: The space environment astronauts experience during space missions consists of multiple environmental challenges, including microgravity. In this study, we assessed the behavioral and cognitive performances of male Fisher rats 2 months after sham irradiation or total body irradiation with photons in the absence or presence of simulated microgravity. We analyzed the plasma collected 9 months after sham irradiation or total body irradiation for distinct alterations in metabolic pathways and to determine whether changes to metabolic measures were associated with specific behavioral and cognitive measures. Methods: A total of 344 male Fischer rats were irradiated with photons (6 MeV; 3, 8, or 10 Gy) in the absence or presence of simulated weightlessness achieved using hindlimb unloading (HU). To identify potential plasma biomarkers of photon radiation exposure or the HU condition for behavioral or cognitive performance, we performed regression analyses. Results: The behavioral effects of HU on activity levels in an open field, measures of anxiety in an elevated plus maze, and anhedonia in the M&M consumption test were more pronounced than those of photon irradiation. Phenylalanine, tyrosine, and tryptophan metabolism, and phenylalanine metabolism and biosynthesis showed very strong pathway changes, following photon irradiation and HU in animals irradiated with 3 Gy. Here, 29 out of 101 plasma metabolites were associated with 1 out of 13 behavioral measures. In the absence of HU, 22 metabolites were related to behavioral and cognitive measures. In HU animals that were sham-irradiated or irradiated with 8 Gy, one metabolite was related to behavioral and cognitive measures. In HU animals irradiated with 3 Gy, six metabolites were related to behavioral and cognitive measures. Discussion: These data suggest that it will be possible to develop stable plasma biomarkers of behavioral and cognitive performance, following environmental challenges like HU and radiation exposure.
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Affiliation(s)
- Jacob Raber
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
- Departments of Neurology, and Radiation Medicine, Division of Neuroscience ONPRC, Oregon Health & Science University, Portland, OR, United States
- College of Pharmacy, Oregon State University, Corvallis, OR, United States
| | - Sarah Holden
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
| | - Kat Kessler
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
| | - Breanna Glaeser
- Neuroscience Center and Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Chloe McQuesten
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
| | - Mitali Chaudhari
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
| | - Fiona Stenzel
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
| | - Marek Lenarczyk
- Radiation Biosciences Laboratory, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Scott Willem Leonard
- Department of Radiation Oncology, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - Jeffrey Morré
- Mass Spectrometry Core, Oregon State University, Corvallis, OR, United States
| | - Jaewoo Choi
- Linus Pauling Institute, Oregon State University, Corvallis, OR, United States
| | - Amy Kronenberg
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - Alexander Borg
- Department of Radiation Oncology, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - Andy Kwok
- Department of Radiation Oncology, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - Jan Frederik Stevens
- College of Pharmacy, Oregon State University, Corvallis, OR, United States
- Linus Pauling Institute, Oregon State University, Corvallis, OR, United States
| | - Christopher Olsen
- Neuroscience Center and Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Jeffrey S. Willey
- Department of Radiation Oncology, Wake Forest School of Medicine, Winston-Salem, NC, United States
| | - Gerd Bobe
- Linus Pauling Institute, Oregon State University, Corvallis, OR, United States
- Department of Animal Sciences, Oregon State University, Corvallis, OR, United States
| | - Jessica Minnier
- Oregon Health & Science University-Portland State University School of Public Health, Knight Cancer Institute Biostatistics Shared Resource, The Knight Cardiovascular Institute, OR Health & Science University, Portland, OR, United States
| | - John E. Baker
- Neuroscience Center and Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, WI, United States
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Lipp HP, Krackow S, Turkes E, Benner S, Endo T, Russig H. IntelliCage: the development and perspectives of a mouse- and user-friendly automated behavioral test system. Front Behav Neurosci 2024; 17:1270538. [PMID: 38235003 PMCID: PMC10793385 DOI: 10.3389/fnbeh.2023.1270538] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 10/18/2023] [Indexed: 01/19/2024] Open
Abstract
IntelliCage for mice is a rodent home-cage equipped with four corner structures harboring symmetrical double panels for operant conditioning at each of the two sides, either by reward (access to water) or by aversion (non-painful stimuli: air-puffs, LED lights). Corner visits, nose-pokes and actual licks at bottle-nipples are recorded individually using subcutaneously implanted transponders for RFID identification of up to 16 adult mice housed in the same home-cage. This allows for recording individual in-cage activity of mice and applying reward/punishment operant conditioning schemes in corners using workflows designed on a versatile graphic user interface. IntelliCage development had four roots: (i) dissatisfaction with standard approaches for analyzing mouse behavior, including standardization and reproducibility issues, (ii) response to handling and housing animal welfare issues, (iii) the increasing number of mouse models had produced a high work burden on classic manual behavioral phenotyping of single mice. and (iv), studies of transponder-chipped mice in outdoor settings revealed clear genetic behavioral differences in mouse models corresponding to those observed by classic testing in the laboratory. The latter observations were important for the development of home-cage testing in social groups, because they contradicted the traditional belief that animals must be tested under social isolation to prevent disturbance by other group members. The use of IntelliCages reduced indeed the amount of classic testing remarkably, while its flexibility was proved in a wide range of applications worldwide including transcontinental parallel testing. Essentially, two lines of testing emerged: sophisticated analysis of spontaneous behavior in the IntelliCage for screening of new genetic models, and hypothesis testing in many fields of behavioral neuroscience. Upcoming developments of the IntelliCage aim at improved stimulus presentation in the learning corners and videotracking of social interactions within the IntelliCage. Its main advantages are (i) that mice live in social context and are not stressfully handled for experiments, (ii) that studies are not restricted in time and can run in absence of humans, (iii) that it increases reproducibility of behavioral phenotyping worldwide, and (iv) that the industrial standardization of the cage permits retrospective data analysis with new statistical tools even after many years.
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Affiliation(s)
- Hans-Peter Lipp
- Faculty of Medicine, Institute of Evolutionary Medicine, University of Zürich, Zürich, Switzerland
| | - Sven Krackow
- Institute of Pathology and Molecular Pathology, University Hospital Zürich, Zürich, Switzerland
| | - Emir Turkes
- Queen Square Institute of Neurology, University College London, London, United Kingdom
| | - Seico Benner
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, Ibaraki, Japan
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Zisiadis GA, Alevyzaki A, Nicola E, Rodrigues CFD, Blomgren K, Osman AM. Memantine increases the dendritic complexity of hippocampal young neurons in the juvenile brain after cranial irradiation. Front Oncol 2023; 13:1202200. [PMID: 37860190 PMCID: PMC10584145 DOI: 10.3389/fonc.2023.1202200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Accepted: 09/20/2023] [Indexed: 10/21/2023] Open
Abstract
Introduction Cranial irradiation (IR) negatively regulates hippocampal neurogenesis and causes cognitive dysfunctions in cancer survivors, especially in pediatric patients. IR decreases proliferation of neural stem/progenitor cells (NSPC) and consequently diminishes production of new hippocampal neurons. Memantine, an NMDA receptor antagonist, used clinically to improve cognition in patients suffering from Alzheimer's disease and dementia. In animal models, memantine acts as a potent enhancer of hippocampal neurogenesis. Memantine was recently proposed as an intervention to improve cognitive impairments occurring after radiotherapy and is currently under investigation in a number of clinical trials, including pediatric patients. To date, preclinical studies investigating the mechanisms underpinning how memantine improves cognition after IR remain limited, especially in the young, developing brain. Here, we investigated whether memantine could restore proliferation in the subgranular zone (SGZ) or rescue the reduction in the number of hippocampal young neurons after IR in the juvenile mouse brain. Methods Mice were whole-brain irradiated with 6 Gy on postnatal day 20 (P20) and subjected to acute or long-term treatment with memantine. Proliferation in the SGZ and the number of young neurons were further evaluated after the treatment. We also measured the levels of neurotrophins associated with memantine improved neural plasticity, brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF). Results We show that acute intraperitoneal treatment with a high, non-clinically used, dose of memantine (50 mg/kg) increased the number of proliferating cells in the intact brain by 72% and prevented 23% of IR-induced decrease in proliferation. Long-term treatment with 10 mg/kg/day of memantine, equivalent to the clinically used dose, did not impact proliferation, neither in the intact brain, nor after IR, but significantly increased the number of young neurons (doublecortin expressing cells) with radial dendrites (29% in sham controls and 156% after IR) and enhanced their dendritic arborization. Finally, we found that long-term treatment with 10 mg/kg/day memantine did not affect the levels of BDNF, but significantly reduced the levels of NGF by 40%. Conclusion These data suggest that the enhanced dendritic complexity of the hippocampal young neurons after treatment with memantine may contribute to the observed improved cognition in patients treated with cranial radiotherapy.
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Affiliation(s)
| | - Androniki Alevyzaki
- Department of Women’s and Children’s Health, Karolinska Institutet, Stockholm, Sweden
| | - Elene Nicola
- Department of Women’s and Children’s Health, Karolinska Institutet, Stockholm, Sweden
| | | | - Klas Blomgren
- Department of Women’s and Children’s Health, Karolinska Institutet, Stockholm, Sweden
- Pediatric Oncology, Karolinska University Hospital, Stockholm, Sweden
| | - Ahmed M. Osman
- Department of Women’s and Children’s Health, Karolinska Institutet, Stockholm, Sweden
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Nemec-Bakk AS, Sridharan V, Seawright JW, Nelson GA, Cao M, Singh P, Cheema AK, Singh B, Li Y, Koturbash I, Miousse IR, Ewing LE, Skinner CM, Landes RD, Lowery JD, Mao XW, Singh SP, Boerma M. Effects of proton and oxygen ion irradiation on cardiovascular function and structure in a rabbit model. LIFE SCIENCES IN SPACE RESEARCH 2023; 37:78-87. [PMID: 37087182 PMCID: PMC10122719 DOI: 10.1016/j.lssr.2023.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 03/13/2023] [Accepted: 03/27/2023] [Indexed: 05/03/2023]
Abstract
PURPOSE Astronauts on missions beyond low Earth orbit will be exposed to galactic cosmic radiation, and there is concern about potential adverse cardiovascular effects. Most of the research to identify cardiovascular risk of space radiation has been performed in rodent models. To aid in the translation of research results to humans, the current study identified long-term effects of high-energy charged particle irradiation on cardiovascular function and structure in a larger non-rodent animal model. MATERIALS AND METHODS At the age of 12 months, male New Zealand white rabbits were exposed to whole-body protons (250 MeV) or oxygen ions (16O, 600 MeV/n) at a dose of 0 or 0.5 Gy and were followed for 12 months after irradiation. Ultrasonography was used to measure in vivo cardiac function and blood flow parameters at 10- and 12-months post-irradiation. At 12 months after irradiation, blood cell counts and blood chemistry values were assessed, and cardiac tissue and aorta were collected for histological as well as molecular and biochemical analyses. Plasma was used for metabolomic analysis and to quantify common markers of cardiac injury. RESULTS A small but significant decrease in the percentage of circulating lymphocytes and an increase in neutrophil percentage was seen 12 months after 0.5 Gy protons, while 16O exposure resulted in an increase in monocyte percentage. Markers of cardiac injury, cardiac troponin I (cTnI) and N-Terminal pro-B-type Natriuretic Peptide were modestly increased in the proton group, and cTnI was also increased after 16O. On the other hand, metabolomics on plasma at 12 months revealed no changes. Both types of irradiation demonstrated alterations in cardiac mitochondrial morphology and an increase in left ventricular protein levels of inflammatory cell marker CD68. However, changes in cardiac function were only mild. CONCLUSION Low dose charged particle irradiation caused mild long-term changes in inflammatory markers, cardiac function, and structure in the rabbit heart, in line with previous studies in mouse and rat models.
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Affiliation(s)
- Ashley S Nemec-Bakk
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA.
| | - Vijayalakshmi Sridharan
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | | | - Gregory A Nelson
- Departments of Basic Sciences and Radiation Medicine, Loma Linda University, Loma Linda, CA, USA
| | - Maohua Cao
- College of Dentistry, Texas A&M, Dallas, TX, USA
| | | | - Amrita K Cheema
- Department of Oncology, Georgetown University Medical Center, Washington, DC, USA
| | - Bhaldev Singh
- Department of Oncology, Georgetown University Medical Center, Washington, DC, USA
| | - Yaoxiang Li
- Department of Oncology, Georgetown University Medical Center, Washington, DC, USA
| | - Igor Koturbash
- Department of Environmental Health Sciences, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Isabelle R Miousse
- Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Laura E Ewing
- Natural State Laboratories and Natural State Genomics, North Little Rock, AR, USA
| | - Charles M Skinner
- Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Reid D Landes
- Department of Biostatistics, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - John D Lowery
- Department of Laboratory Animal Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Xiao-Wen Mao
- Departments of Basic Sciences and Radiation Medicine, Loma Linda University, Loma Linda, CA, USA
| | - Sharda P Singh
- Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, USA
| | - Marjan Boerma
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA
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Valdés Zayas A, Kumari N, Liu K, Neill D, Delahoussaye A, Gonçalves Jorge P, Geyer R, Lin SH, Bailat C, Bochud F, Moeckli R, Koong AC, Bourhis J, Taniguchi CM, Herrera FG, Schüler E. Independent Reproduction of the FLASH Effect on the Gastrointestinal Tract: A Multi-Institutional Comparative Study. Cancers (Basel) 2023; 15:cancers15072121. [PMID: 37046782 PMCID: PMC10093322 DOI: 10.3390/cancers15072121] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 03/27/2023] [Accepted: 03/31/2023] [Indexed: 04/05/2023] Open
Abstract
FLASH radiation therapy (RT) is a promising new paradigm in radiation oncology. However, a major question that remains is the robustness and reproducibility of the FLASH effect when different irradiators are used on animals or patients with different genetic backgrounds, diets, and microbiomes, all of which can influence the effects of radiation on normal tissues. To address questions of rigor and reproducibility across different centers, we analyzed independent data sets from The University of Texas MD Anderson Cancer Center and from Lausanne University (CHUV). Both centers investigated acute effects after total abdominal irradiation to C57BL/6 animals delivered by the FLASH Mobetron system. The two centers used similar beam parameters but otherwise conducted the studies independently. The FLASH-enabled animal survival and intestinal crypt regeneration after irradiation were comparable between the two centers. These findings, together with previously published data using a converted linear accelerator, show that a robust and reproducible FLASH effect can be induced as long as the same set of irradiation parameters are used.
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Affiliation(s)
- Anet Valdés Zayas
- Radio-Oncology Department, AGORA Cancer Research Institute, Lausanne University Hospital, Lausanne University, Rue du Bugnon 46, CH-1011 Lausanne, Switzerland
| | - Neeraj Kumari
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Kevin Liu
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
- Graduate School of Biomedical Sciences, The University of Texas, Houston, TX 77030, USA
| | - Denae Neill
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Abagail Delahoussaye
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Patrik Gonçalves Jorge
- Institute of Radiation Physics, Lausanne University Hospital, Lausanne University, Rue du Grand-Pré-1, CH-1007 Lausanne, Switzerland
| | - Reiner Geyer
- Institute of Radiation Physics, Lausanne University Hospital, Lausanne University, Rue du Grand-Pré-1, CH-1007 Lausanne, Switzerland
| | - Steven H. Lin
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
- Graduate School of Biomedical Sciences, The University of Texas, Houston, TX 77030, USA
| | - Claude Bailat
- Institute of Radiation Physics, Lausanne University Hospital, Lausanne University, Rue du Grand-Pré-1, CH-1007 Lausanne, Switzerland
| | - François Bochud
- Institute of Radiation Physics, Lausanne University Hospital, Lausanne University, Rue du Grand-Pré-1, CH-1007 Lausanne, Switzerland
| | - Raphael Moeckli
- Institute of Radiation Physics, Lausanne University Hospital, Lausanne University, Rue du Grand-Pré-1, CH-1007 Lausanne, Switzerland
| | - Albert C. Koong
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
- Graduate School of Biomedical Sciences, The University of Texas, Houston, TX 77030, USA
| | - Jean Bourhis
- Radio-Oncology Department, AGORA Cancer Research Institute, Lausanne University Hospital, Lausanne University, Rue du Bugnon 46, CH-1011 Lausanne, Switzerland
| | - Cullen M. Taniguchi
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
- Graduate School of Biomedical Sciences, The University of Texas, Houston, TX 77030, USA
| | - Fernanda G. Herrera
- Radio-Oncology Department, AGORA Cancer Research Institute, Lausanne University Hospital, Lausanne University, Rue du Bugnon 46, CH-1011 Lausanne, Switzerland
| | - Emil Schüler
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
- Graduate School of Biomedical Sciences, The University of Texas, Houston, TX 77030, USA
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de Guzman AE, Ahmed M, Perrier S, Hammill C, Li YQ, Wong CS, Nieman BJ. Protection from radiation-induced neuroanatomical deficits by CCL2-deficiency is dependent on sex. Int J Radiat Oncol Biol Phys 2022; 113:390-400. [PMID: 35143888 DOI: 10.1016/j.ijrobp.2022.01.035] [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: 08/26/2021] [Revised: 01/19/2022] [Accepted: 01/23/2022] [Indexed: 11/26/2022]
Abstract
PURPOSE Cranial radiation therapy for the treatment of paediatric brain tumours results in changes to brain development that are detectable with magnetic resonance imaging (MRI). We have previously demonstrated similar structural changes in both humans and mice. The goal of the current study was to examine the role of inflammation in this response. Since neuroanatomical volume deficits in paediatric survivors are more pronounced in females, we also evaluated possible dependence on sex. EXPERIMENTAL DESIGN Male mice deficient in the C-C chemokine ligand 2 gene (Ccl2; previously Mcp-1) have been shown by others to have a muted neuroinflammatory response after irradiation. We irradiated Ccl2-/- (HOM; females[f]=12, males[m]=13), Ccl2+/- (HET; f=13, m=16), and Ccl2+/+ (WT; f=11, m=13) mice with a whole brain dose of 7 Gy during infancy. Control mice (with approximately equal groups sizes) were anaesthetized but not irradiated. In vivo MR images were acquired at 4 time points up to 3 months following irradiation, and deformation-based morphometry was used to identify volume differences. RESULTS Irradiation of WT mice resulted in a deficit in neuroanatomical growth with limited sex dependence. HOM and HET males were significantly protected from this radiation-induced damage, while HOM and HET females were not. We conclude that interventions aimed at mitigating the effects of cranial radiation therapy in paediatric cancer survivors by modulating inflammatory response will need to consider patient sex.
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Affiliation(s)
- A Elizabeth de Guzman
- Mouse Imaging Centre, Hospital for Sick Children, 25 Orde Street, Toronto, Ontario, M5T 3H7, Canada; Translational Medicine, Hospital for Sick Children, 555 University Ave, Toronto, Ontario, M5G 1X8, Canada; Department of Medical Biophysics, University of Toronto, 610 University Avenue, Rm 7-411, Toronto, Ontario, M5G 2M9, Canada
| | - Mashal Ahmed
- Mouse Imaging Centre, Hospital for Sick Children, 25 Orde Street, Toronto, Ontario, M5T 3H7, Canada; Translational Medicine, Hospital for Sick Children, 555 University Ave, Toronto, Ontario, M5G 1X8, Canada
| | - Stefanie Perrier
- Mouse Imaging Centre, Hospital for Sick Children, 25 Orde Street, Toronto, Ontario, M5T 3H7, Canada; Translational Medicine, Hospital for Sick Children, 555 University Ave, Toronto, Ontario, M5G 1X8, Canada
| | - Christopher Hammill
- Mouse Imaging Centre, Hospital for Sick Children, 25 Orde Street, Toronto, Ontario, M5T 3H7, Canada
| | - Yu-Qing Li
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre, Odette Cancer Centre, 2075 Bayview Avenue, Toronto, Ontario, M4N 3M5, Canada
| | - C Shun Wong
- Department of Medical Biophysics, University of Toronto, 610 University Avenue, Rm 7-411, Toronto, Ontario, M5G 2M9, Canada; Department of Radiation Oncology, Sunnybrook Health Sciences Centre, Odette Cancer Centre, 2075 Bayview Avenue, Toronto, Ontario, M4N 3M5, Canada; Department of Radiation Oncology, University of Toronto, 149 College Street - Stewart Building, Suite 504, Toronto, Ontario, M5T 1P5, Canada
| | - Brian J Nieman
- Mouse Imaging Centre, Hospital for Sick Children, 25 Orde Street, Toronto, Ontario, M5T 3H7, Canada; Translational Medicine, Hospital for Sick Children, 555 University Ave, Toronto, Ontario, M5G 1X8, Canada; Department of Medical Biophysics, University of Toronto, 610 University Avenue, Rm 7-411, Toronto, Ontario, M5G 2M9, Canada; Ontario Institute for Cancer Research, Toronto, Ontario, Canada.
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8
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Nemec-Bakk AS, Sridharan V, Landes RD, Singh P, Cao M, Dominic P, Seawright JW, Chancellor JC, Boerma M. Effects of low-dose oxygen ions on cardiac function and structure in female C57BL/6J mice. LIFE SCIENCES IN SPACE RESEARCH 2022; 32:105-112. [PMID: 35065756 PMCID: PMC8803400 DOI: 10.1016/j.lssr.2021.12.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/27/2021] [Accepted: 12/28/2021] [Indexed: 05/07/2023]
Abstract
PURPOSE Astronauts in space vehicles beyond low-Earth orbit will be exposed to high charge and energy (HZE) ions, and there is concern about potential adverse effects on the cardiovascular system. Thus far, most animal studies that assess cardiac effects of HZE particles have included only males. This study assessed the effects of oxygen ions (16O) as a representative ion of the intravehicular radiation environment on the heart of female mice. MATERIALS AND METHODS Female C57BL/6 J mice at 6 months of age were exposed to 16O (600 MeV/n) at 0.25-0.26 Gy/min to a total dose of 0, 0.1, or 0.25 Gy. Cardiac function and abdominal aorta blood velocity were measured with ultrasonography at 3, 5, 7, and 9 months after irradiation. At 2 weeks, 3 months, and 9 months, cardiac tissue was collected to assess collagen deposition and markers of immune cells. RESULTS Ultrasonography revealed increased left ventricle mass, diastolic volume and diameter but there was no change in the abdominal aorta. There was no indication of cardiac fibrosis however, a 75 kDa peptide of left ventricular collagen type III and α-smooth muscle cell actin were increased suggesting some remodeling had occurred. Left ventricular protein levels of the T-cell marker CD2 was significantly increased at all time points, while the neutrophil marker myeloperoxidase was decreased at 2 weeks and 9 months. CONCLUSIONS These results taken together suggest 16O ion exposure did not result in cardiac fibrosis or cardiac dysfunction in female mice. However, it does appear mild cardiac remodeling occurs in response to HZE radiation.
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Affiliation(s)
- Ashley S Nemec-Bakk
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA.
| | - Vijayalakshmi Sridharan
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Reid D Landes
- Department of Biostatistics, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Preeti Singh
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Maohua Cao
- College of Dentistry, Texas A&M University, Dallas TX, USA
| | - Paari Dominic
- Department of Medicine and Center of Excellence for Cardiovascular Diseases & Sciences, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | | | - Jeffery C Chancellor
- Department of Physics & Astronomy, Louisiana State University, Baton Rouge, LA, USA; Department of Preventative Medicine & Population Health, University of Texas Medical Branch, Galveston, TX, USA; Outer Space Institute, University of British Columbia, Vancouver, CA, Canada
| | - Marjan Boerma
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA
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9
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Craeghs L, Callaerts-Vegh Z, Verslegers M, Van der Jeugd A, Govaerts K, Dresselaers T, Wogensen E, Verreet T, Moons L, Benotmane MA, Himmelreich U, D'Hooge R. Prenatal Radiation Exposure Leads to Higher-Order Telencephalic Dysfunctions in Adult Mice That Coincide with Reduced Synaptic Plasticity and Cerebral Hypersynchrony. Cereb Cortex 2021; 32:3525-3541. [PMID: 34902856 DOI: 10.1093/cercor/bhab431] [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: 04/06/2021] [Revised: 10/25/2021] [Accepted: 10/26/2021] [Indexed: 11/14/2022] Open
Abstract
Higher-order telencephalic circuitry has been suggested to be especially vulnerable to irradiation or other developmentally toxic impact. This report details the adult effects of prenatal irradiation at a sensitive time point on clinically relevant brain functions controlled by telencephalic regions, hippocampus (HPC), and prefrontal cortex (PFC). Pregnant C57Bl6/J mice were whole-body irradiated at embryonic day 11 (start of neurogenesis) with X-ray intensities of 0.0, 0.5, or 1.0 Gy. Female offspring completed a broad test battery of HPC-/PFC-controlled tasks that included cognitive performance, fear extinction, exploratory, and depression-like behaviors. We examined neural functions that are mechanistically related to these behavioral and cognitive changes, such as hippocampal field potentials and long-term potentiation, functional brain connectivity (by resting-state functional magnetic resonance imaging), and expression of HPC vesicular neurotransmitter transporters (by immunohistochemical quantification). Prenatally exposed mice displayed several higher-order dysfunctions, such as decreased nychthemeral activity, working memory defects, delayed extinction of threat-evoked response suppression as well as indications of perseverative behavior. Electrophysiological examination indicated impaired hippocampal synaptic plasticity. Prenatal irradiation also induced cerebral hypersynchrony and increased the number of glutamatergic HPC terminals. These changes in brain connectivity and plasticity could mechanistically underlie the irradiation-induced defects in higher telencephalic functions.
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Affiliation(s)
- Livine Craeghs
- Department of Brain & Cognition, Research Group Biological Psychology, University of Leuven (KU Leuven), Leuven 3000, Belgium
| | - Zsuzsanna Callaerts-Vegh
- Department of Brain & Cognition, Research Group Biological Psychology, University of Leuven (KU Leuven), Leuven 3000, Belgium
| | - Mieke Verslegers
- Department of Radiobiology, Institute for Environmental Health and Safety, Nuclear Research Center (SCK CEN), Mol 2400, Belgium
| | - Ann Van der Jeugd
- Department of Brain & Cognition, Research Group Biological Psychology, University of Leuven (KU Leuven), Leuven 3000, Belgium
| | - Kristof Govaerts
- Department of Imaging & Pathology, Research Group Biomedical MRI, University of Leuven (KU Leuven), Leuven 3000, Belgium
| | - Tom Dresselaers
- Department of Imaging & Pathology, Research Group Biomedical MRI, University of Leuven (KU Leuven), Leuven 3000, Belgium
| | - Elise Wogensen
- Department of Brain & Cognition, Research Group Biological Psychology, University of Leuven (KU Leuven), Leuven 3000, Belgium
| | - Tine Verreet
- Department of Radiobiology, Institute for Environmental Health and Safety, Nuclear Research Center (SCK CEN), Mol 2400, Belgium
| | - Lieve Moons
- Department of Biology, Research Group Neural Circuit Development and Regeneration, University of Leuven (KU Leuven), Leuven 3000, Belgium
| | - Mohammed A Benotmane
- Department of Radiobiology, Institute for Environmental Health and Safety, Nuclear Research Center (SCK CEN), Mol 2400, Belgium
| | - Uwe Himmelreich
- Department of Imaging & Pathology, Research Group Biomedical MRI, University of Leuven (KU Leuven), Leuven 3000, Belgium
| | - Rudi D'Hooge
- Department of Brain & Cognition, Research Group Biological Psychology, University of Leuven (KU Leuven), Leuven 3000, Belgium
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10
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Garrett L, Ung MC, Einicke J, Zimprich A, Fenzl F, Pawliczek D, Graw J, Dalke C, Hölter SM. Complex Long-term Effects of Radiation on Adult Mouse Behavior. Radiat Res 2021; 197:67-77. [PMID: 34237145 DOI: 10.1667/rade-20-00281.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 05/24/2021] [Indexed: 11/03/2022]
Abstract
We have shown previously that a single radiation event (0.063, 0.125 or 0.5 Gy, 0.063 Gy/min) in adult mice (age 10 weeks) can have delayed dose-dependent effects on locomotor behavior 18 months postirradiation. The highest dose (0.5 Gy) reduced, whereas the lowest dose (0.063 Gy) increased locomotor activity at older age independent of sex or genotype. In the current study we investigated whether higher doses administered at a higher dose rate (0.5, 1 or 2 Gy, 0.3 Gy/min) at the same age (10 weeks) cause stronger or earlier effects on a range of behaviors, including locomotion, anxiety, sensorimotor and cognitive behavior. There were clear dose-dependent effects on spontaneous locomotor and exploratory activity, anxiety-related behavior, body weight and affiliative social behavior independent of sex or genotype of wild-type and Ercc2S737P heterozygous mice on a mixed C57BL/6JG and C3HeB/FeJ background. In addition, smaller genotype- and dose-dependent radiation effects on working memory were evident in males, but not in females. The strongest dose-dependent radiation effects were present 4 months postirradiation, but only effects on affiliative social behaviors persisted until 12 months postirradiation. The observed radiation-induced behavioral changes were not related to alterations in the eye lens, as 4 months postirradiation anterior and posterior parts of the lens were still normal. Overall, we did not find any sensitizing effect of the mutation towards radiation effects in vivo.
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Affiliation(s)
- Lillian Garrett
- Helmholtz Zentrum München, German Research Centre for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany
| | - Marie-Claire Ung
- Helmholtz Zentrum München, German Research Centre for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany
| | - Jan Einicke
- Helmholtz Zentrum München, German Research Centre for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany
| | - Annemarie Zimprich
- Technical University Munich, School of Life Science Weihenstephan, Freising, Germany
| | - Felix Fenzl
- Technical University Munich, School of Life Science Weihenstephan, Freising, Germany
| | - Daniel Pawliczek
- Helmholtz Zentrum München, German Research Centre for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany
| | - Jochen Graw
- Helmholtz Zentrum München, German Research Centre for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany
| | - Claudia Dalke
- Helmholtz Zentrum München, German Research Centre for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany
| | - Sabine M Hölter
- Helmholtz Zentrum München, German Research Centre for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany.,Technical University Munich, School of Life Science Weihenstephan, Freising, Germany
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11
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Radiation Triggers a Dynamic Sequence of Transient Microglial Alterations in Juvenile Brain. Cell Rep 2021; 31:107699. [PMID: 32492415 DOI: 10.1016/j.celrep.2020.107699] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 10/08/2019] [Accepted: 05/06/2020] [Indexed: 11/21/2022] Open
Abstract
Cranial irradiation (IR), an effective tool to treat malignant brain tumors, triggers a chronic pro-inflammatory microglial response, at least in the adult brain. Using single-cell and bulk RNA sequencing, combined with histology, we show that the microglial response in the juvenile mouse hippocampus is rapid but returns toward normal within 1 week. The response is characterized by a series of temporally distinct homeostasis-, sensome-, and inflammation-related molecular signatures. We find that a single microglial cell simultaneously upregulates transcripts associated with pro- and anti-inflammatory microglial phenotypes. Finally, we show that juvenile and adult irradiated microglia are already transcriptionally distinct in the early phase after IR. Our results indicate that microglia are involved in the initial stages but may not be responsible for driving long-term inflammation in the juvenile brain.
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12
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Ren BX, Huen I, Wu ZJ, Wang H, Duan MY, Guenther I, Bhanu Prakash KN, Tang FR. Early postnatal irradiation-induced age-dependent changes in adult mouse brain: MRI based characterization. BMC Neurosci 2021; 22:28. [PMID: 33882822 PMCID: PMC8061041 DOI: 10.1186/s12868-021-00635-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Accepted: 04/13/2021] [Indexed: 02/08/2023] Open
Abstract
Background Brain radiation exposure, in particular, radiotherapy, can induce cognitive impairment in patients, with significant effects persisting for the rest of their life. However, the main mechanisms leading to this adverse event remain largely unknown. A study of radiation-induced injury to multiple brain regions, focused on the hippocampus, may shed light on neuroanatomic bases of neurocognitive impairments in patients. Hence, we irradiated BALB/c mice (male and female) at postnatal day 3 (P3), day 10 (P10), and day 21 (P21) and investigated the long-term radiation effect on brain MRI changes and hippocampal neurogenesis. Results We found characteristic brain volume reductions in the hippocampus, olfactory bulbs, the cerebellar hemisphere, cerebellar white matter (WM) and cerebellar vermis WM, cingulate, occipital and frontal cortices, cerebellar flocculonodular WM, parietal region, endopiriform claustrum, and entorhinal cortex after irradiation with 5 Gy at P3. Irradiation at P10 induced significant volume reduction in the cerebellum, parietal region, cingulate region, and olfactory bulbs, whereas the reduction of the volume in the entorhinal, parietal, insular, and frontal cortices was demonstrated after irradiation at P21. Immunohistochemical study with cell division marker Ki67 and immature marker doublecortin (DCX) indicated the reduced cell division and genesis of new neurons in the subgranular zone of the dentate gyrus in the hippocampus after irradiation at all three postnatal days, but the reduction of total granule cells in the stratum granulosun was found after irradiation at P3 and P10. Conclusions The early life radiation exposure during different developmental stages induces varied brain pathophysiological changes which may be related to the development of neurological and neuropsychological disorders later in life.
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Affiliation(s)
- Bo Xu Ren
- Department of Medical Imaging, School of Medicine, Yangtze University, 1 Nanhuan Road, Jingzhou, 434023, Hubei, China
| | - Isaac Huen
- Singapore Bioimaging Consortium (SBIC), Agency for Science, Technology and Research (A*STAR), Singapore, 138667, Singapore
| | - Zi Jun Wu
- Huaxi MR Research Center (HMRRC), Functional and Molecular Imaging Key Laboratory of Sichuan Province, Department of Radiology, West China Hospital, Sichuan University, Chengdu, China
| | - Hong Wang
- Radiation Physiology Laboratory, Nuclear Research and Safety Initiative, National University of Singapore, CREATE Tower, 1 CREATE Way #04-01, Singapore, 138602, Singapore
| | - Meng Yun Duan
- Department of Medical Imaging, School of Medicine, Yangtze University, 1 Nanhuan Road, Jingzhou, 434023, Hubei, China
| | - Ilonka Guenther
- Comparative Medicine, Centre for Life Sciences (CeLS), National University of Singapore, #05-02, 28 Medical Drive, Singapore, 117456, Singapore
| | - K N Bhanu Prakash
- Singapore Bioimaging Consortium (SBIC), Agency for Science, Technology and Research (A*STAR), Singapore, 138667, Singapore.
| | - Feng Ru Tang
- Radiation Physiology Laboratory, Nuclear Research and Safety Initiative, National University of Singapore, CREATE Tower, 1 CREATE Way #04-01, Singapore, 138602, Singapore.
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13
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Han J, Fan Y, Zhou K, Blomgren K, Harris RA. Uncovering sex differences of rodent microglia. J Neuroinflammation 2021; 18:74. [PMID: 33731174 PMCID: PMC7972194 DOI: 10.1186/s12974-021-02124-z] [Citation(s) in RCA: 72] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 03/05/2021] [Indexed: 12/11/2022] Open
Abstract
There are inherent structural and functional differences in the central nervous systems (CNS) of females and males. It has been gradually established that these sex-specific differences are due to a spectrum of genetic, epigenetic, and hormonal factors which actively contribute to the differential incidences, disease courses, and even outcomes of CNS diseases between sexes. Microglia, as principle resident macrophages in the CNS, play a crucial role in both CNS physiology and pathology. However, sex differences of microglia have been relatively unexplored until recently. Emerging data has convincingly demonstrated the existence of sex-dependent structural and functional differences of rodent microglia, consequently changing our current understanding of these versatile cells. In this review, we attempt to comprehensively outline the current advances revealing microglial sex differences in rodent and their potential implications for specific CNS diseases with a stark sex difference. A detailed understanding of molecular processes underlying microglial sex differences is of major importance in design of translational sex- and microglia-specific therapeutic approaches.
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Affiliation(s)
- Jinming Han
- Applied Immunology and Immunotherapy, Department of Clinical Neuroscience, Karolinska Institutet, Center for Molecular Medicine, Karolinska University Hospital, CMM L8:04, Karolinska Sjukhuset, S-171 76, Stockholm, Sweden.
| | - Yueshan Fan
- Applied Immunology and Immunotherapy, Department of Clinical Neuroscience, Karolinska Institutet, Center for Molecular Medicine, Karolinska University Hospital, CMM L8:04, Karolinska Sjukhuset, S-171 76, Stockholm, Sweden.,Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China.,Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin Neurological Institute, Tianjin, China.,Tianjin Medical University, Tianjin, China
| | - Kai Zhou
- Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden.,Department of Pediatrics, Children's Hospital of Zhengzhou, Zhengzhou, China
| | - Klas Blomgren
- Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden.,Pediatric Oncology, Karolinska University Hospital, Stockholm, Sweden
| | - Robert A Harris
- Applied Immunology and Immunotherapy, Department of Clinical Neuroscience, Karolinska Institutet, Center for Molecular Medicine, Karolinska University Hospital, CMM L8:04, Karolinska Sjukhuset, S-171 76, Stockholm, Sweden.
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14
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Li YQ, Wong CS. Metabolic Regulation of Hippocampal Neuronal Development and Its Inhibition After Irradiation. J Neuropathol Exp Neurol 2021; 80:467-475. [PMID: 33706379 DOI: 10.1093/jnen/nlab014] [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] [Indexed: 11/14/2022] Open
Abstract
5'-Adenosine monophosphate-activated protein kinase (AMPK), a key regulator of cellular energy homeostasis, plays a role in cell fate determination. Whether AMPK regulates hippocampal neuronal development remains unclear. Hippocampal neurogenesis is abrogated after DNA damage. Here, we asked whether AMPK regulates adult hippocampal neurogenesis and its inhibition following irradiation. Adult Cre-lox mice deficient in AMPK in brain, and wild-type mice were used in a birth-dating study using bromodeoxyuridine to evaluate hippocampal neurogenesis. There was no evidence of AMPK or phospho-AMPK immunoreactivity in hippocampus. Increase in p-AMPK but not AMPK expression was observed in granule neurons and subgranular neuroprogenitor cells (NPCs) in the dentate gyrus within 24 hours and persisted up to 9 weeks after irradiation. AMPK deficiency in Cre-lox mice did not alter neuroblast and newborn neuron numbers but resulted in decreased newborn and proliferating NPCs. Inhibition of neurogenesis was observed after irradiation regardless of genotypes. In Cre-lox mice, there was further loss of newborn early NPCs and neuroblasts but not newborn neurons after irradiation compared with wild-type mice. These results are consistent with differential negative effect of AMPK on hippocampal neuronal development and its inhibition after irradiation.
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Affiliation(s)
- Yu-Qing Li
- From the Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
| | - C Shun Wong
- From the Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
- Departments of Radiation Oncology and Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
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15
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Zanni G, Goto S, Fragopoulou AF, Gaudenzi G, Naidoo V, Di Martino E, Levy G, Dominguez CA, Dethlefsen O, Cedazo-Minguez A, Merino-Serrais P, Stamatakis A, Hermanson O, Blomgren K. Lithium treatment reverses irradiation-induced changes in rodent neural progenitors and rescues cognition. Mol Psychiatry 2021; 26:322-340. [PMID: 31723242 PMCID: PMC7815512 DOI: 10.1038/s41380-019-0584-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 10/13/2019] [Accepted: 10/25/2019] [Indexed: 12/21/2022]
Abstract
Cranial radiotherapy in children has detrimental effects on cognition, mood, and social competence in young cancer survivors. Treatments harnessing hippocampal neurogenesis are currently of great relevance in this context. Lithium, a well-known mood stabilizer, has both neuroprotective, pro-neurogenic as well as antitumor effects, and in the current study we introduced lithium treatment 4 weeks after irradiation. Female mice received a single 4 Gy whole-brain radiation dose on postnatal day (PND) 21 and were randomized to 0.24% Li2CO3 chow or normal chow from PND 49 to 77. Hippocampal neurogenesis was assessed on PND 77, 91, and 105. We found that lithium treatment had a pro-proliferative effect on neural progenitors, but neuronal integration occurred only after it was discontinued. Also, the treatment ameliorated deficits in spatial learning and memory retention observed in irradiated mice. Gene expression profiling and DNA methylation analysis identified two novel factors related to the observed effects, Tppp, associated with microtubule stabilization, and GAD2/65, associated with neuronal signaling. Our results show that lithium treatment reverses irradiation-induced loss of hippocampal neurogenesis and cognitive impairment even when introduced long after the injury. We propose that lithium treatment should be intermittent in order to first make neural progenitors proliferate and then, upon discontinuation, allow them to differentiate. Our findings suggest that pharmacological treatment of cognitive so-called late effects in childhood cancer survivors is possible.
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Affiliation(s)
- Giulia Zanni
- Department of Women's and Children's Health, Karolinska Institutet, BioClinicum J9:30, 171 64, Stockholm, Sweden.
- Department of Developmental Neuroscience, New York State Psychiatric Institute, Columbia University, 1051 Riverside, New York, NY, 10032, USA.
| | - Shinobu Goto
- Department of Women's and Children's Health, Karolinska Institutet, BioClinicum J9:30, 171 64, Stockholm, Sweden
- Department of Obstetrics and Gynecology, Nagoya City University Graduate School of Medical Sciences, 467-8601, 1, Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, Japan
| | - Adamantia F Fragopoulou
- Department of Women's and Children's Health, Karolinska Institutet, BioClinicum J9:30, 171 64, Stockholm, Sweden
| | - Giulia Gaudenzi
- Department of Neuroscience, Karolinska Institutet, Biomedicum, 171 77, Stockholm, Sweden
- Department of Protein Science, Division of Nanobiotechnology, KTH Royal Institute of Technology, Science for Life Laboratory, 171 21, Stockholm, Sweden
| | - Vinogran Naidoo
- Department of Women's and Children's Health, Karolinska Institutet, BioClinicum J9:30, 171 64, Stockholm, Sweden
- Department of Human Biology, Faculty of Health Sciences, Anzio Road Observatory, 7925, University of Cape Town, Cape Town, South Africa
| | - Elena Di Martino
- Department of Women's and Children's Health, Karolinska Institutet, BioClinicum J9:30, 171 64, Stockholm, Sweden
| | - Gabriel Levy
- Department of Women's and Children's Health, Karolinska Institutet, BioClinicum J9:30, 171 64, Stockholm, Sweden
- Ludwig Institute for Cancer Research, Brussels Branch, Avenue Hippocrate 75, 1200, Brussels, Belgium
| | - Cecilia A Dominguez
- Department of Women's and Children's Health, Karolinska Institutet, BioClinicum J9:30, 171 64, Stockholm, Sweden
| | - Olga Dethlefsen
- National Bioinformatics Infrastructure Sweden (NIBIS), Science for Life Laboratory (SciLifeLab), Svante Arrhenius väg 16C, 106 91, Stockholm, Sweden
- Department of Biochemistry and Biophysics (DBB), Stockholm University, Svante Arrhenius väg 16C, 106 91, Stockholm, Sweden
| | - Angel Cedazo-Minguez
- Department of Neurobiology, Care Sciences and Society, Center for Alzheimer Research, Division of Neurogeriatrics, Karolinska Institutet, BioClinicum J9:20, 171 64, Stockholm, Sweden
| | - Paula Merino-Serrais
- Department of Neurobiology, Care Sciences and Society, Center for Alzheimer Research, Division of Neurogeriatrics, Karolinska Institutet, BioClinicum J9:20, 171 64, Stockholm, Sweden
| | - Antonios Stamatakis
- Biology-Biochemistry Lab, Faculty of Nursing, School of Health Sciences, National and Kapodistrian University of Athens, Papadiamantopoulou 123, Goudi, 11527, Athens, Greece
| | - Ola Hermanson
- Department of Neuroscience, Karolinska Institutet, Biomedicum, 171 77, Stockholm, Sweden
| | - Klas Blomgren
- Department of Women's and Children's Health, Karolinska Institutet, BioClinicum J9:30, 171 64, Stockholm, Sweden.
- Pediatric Oncology, Karolinska University Hospital, Eugeniavägen 23, 171 64, Stockholm, Sweden.
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16
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Raber J, Fuentes Anaya A, Torres ERS, Lee J, Boutros S, Grygoryev D, Hammer A, Kasschau KD, Sharpton TJ, Turker MS, Kronenberg A. Effects of Six Sequential Charged Particle Beams on Behavioral and Cognitive Performance in B6D2F1 Female and Male Mice. Front Physiol 2020; 11:959. [PMID: 32982769 PMCID: PMC7485338 DOI: 10.3389/fphys.2020.00959] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 07/15/2020] [Indexed: 12/12/2022] Open
Abstract
The radiation environment astronauts are exposed to in deep space includes galactic cosmic radiation (GCR) with different proportions of all naturally occurring ions. To assist NASA with assessment of risk to the brain following exposure to a mixture of ions broadly representative of the GCR, we assessed the behavioral and cognitive performance of female and male C57BL/6J × DBA2/J F1 (B6D2F1) mice two months following rapidly delivered, sequential 6 beam irradiation with protons (1 GeV, LET = 0.24 keV, 50%), 4He ions (250 MeV/n, LET = 1.6 keV/μm, 20%), 16O ions (250 MeV/n, LET = 25 keV/μm 7.5%), 28Si ions (263 MeV/n, LET = 78 keV/μm, 7.5%), 48Ti ions (1 GeV/n, LET = 107 keV/μm, 7.5%), and 56Fe ions (1 GeV/n, LET = 151 keV/μm, 7.5%) at 0, 25, 50, or 200 cGy) at 4-6 months of age. When the activity over 3 days of open field habituation was analyzed in female mice, those irradiated with 50 cGy moved less and spent less time in the center than sham-irradiated mice. Sham-irradiated female mice and those irradiated with 25 cGy showed object recognition. However, female mice exposed to 50 or 200 cGy did not show object recognition. When fear memory was assessed in passive avoidance tests, sham-irradiated mice and mice irradiated with 25 cGy showed memory retention while mice exposed to 50 or 200 cGy did not. The effects of radiation passive avoidance memory retention were not sex-dependent. There was no effect of radiation on depressive-like behavior in the forced swim test. There was a trend toward an effect of radiation on BDNF levels in the cortex of males, but not for females, with higher levels in male mice irradiated with 50 cGy than sham-irradiated. Finally, sequential 6-ion irradiation impacted the composition of the gut microbiome in a sex-dependent fashion. Taxa were uncovered whose relative abundance in the gut was associated with the radiation dose received. Thus, exposure to sequential six-beam irradiation significantly affects behavioral and cognitive performance and the gut microbiome.
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Affiliation(s)
- Jacob Raber
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
- Departments of Neurology and Radiation Medicine, Division of Neuroscience ONPRC, Oregon Health & Science University, Portland, OR, United States
| | - Andrea Fuentes Anaya
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
| | - Eileen Ruth S. Torres
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
| | - Joanne Lee
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
| | - Sydney Boutros
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, United States
| | - Dmytro Grygoryev
- Oregon Institute of Occupational Health Sciences and Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, OR, United States
| | - Austin Hammer
- Department of Microbiology, Oregon State University, Corvallis, OR, United States
| | - Kristin D. Kasschau
- Department of Microbiology, Oregon State University, Corvallis, OR, United States
| | - Thomas J. Sharpton
- Department of Microbiology, Oregon State University, Corvallis, OR, United States
- Department of Statistics, Oregon State University, Corvallis, OR, United States
| | - Mitchell S. Turker
- Oregon Institute of Occupational Health Sciences and Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, OR, United States
| | - Amy Kronenberg
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
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17
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Lamirault C, Doyère V, Juchaux M, Pouzoulet F, Labiod D, Dendale R, Patriarca A, Nauraye C, Le Dudal M, Jouvion G, Hardy D, Massioui NE, Prezado Y. Short and long-term evaluation of the impact of proton minibeam radiation therapy on motor, emotional and cognitive functions. Sci Rep 2020; 10:13511. [PMID: 32782370 PMCID: PMC7419511 DOI: 10.1038/s41598-020-70371-w] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 07/15/2020] [Indexed: 12/23/2022] Open
Abstract
Radiotherapy (RT) is one of the most frequently used methods for cancer treatment. Despite remarkable advancements in RT techniquesthe treatment of radioresistant tumours (i.e. high-grade gliomas) is not yet satisfactory. Finding novel approaches less damaging for normal tissues is of utmost importance. This would make it possible to increase the dose applied to tumours, resulting in an improvement in the cure rate. Along this line, proton minibeam radiation therapy (pMBRT) is a novel strategy that allows the spatial modulation of the dose, leading to minimal damage to brain structures compared to a high dose (25 Gy in one fraction) of standard proton therapy (PT). The aim of the present study was to evaluate whether pMBRT also preserves important cerebral functions. Comprehensive longitudinal behavioural studies were performed in irradiated (peak dose of 57 Gy in one fraction) and control rats to evaluate the impact of pMBRT on motor function (motor coordination, muscular tonus, and locomotor activity), emotional function (anxiety, fear, motivation, and impulsivity), and cognitive function (learning, memory, temporal processing, and decision making). The evaluations, which were conducted over a period of 10 months, showed no significant motor or emotional dysfunction in pMBRT-irradiated rats compared with control animals. Concerning cognitive functions, similar performance was observed between the groups, although some slight learning delays might be present in some of the tests in the long term after irradiation. This study shows the minimal impact of pMBRT on the normal brain at the functional level.
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Affiliation(s)
- Charlotte Lamirault
- Translational Research Department, Experimental Radiotherapy Platform, Institut Curie, PSL Research University, Orsay, France
| | - Valérie Doyère
- Université Paris-Saclay, CNRS, Institut des Neurosciences Paris-Saclay, 91190, Gif-sur-Yvette, France
| | - Marjorie Juchaux
- Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab-UMR 9012), CNRS/Université Paris-Saclay/Université de Paris, Campus Universitaire, Orsay, France
| | - Frederic Pouzoulet
- Translational Research Department, Experimental Radiotherapy Platform, Institut Curie, PSL Research University, Orsay, France
| | - Dalila Labiod
- Translational Research Department, Experimental Radiotherapy Platform, Institut Curie, PSL Research University, Orsay, France
| | - Remi Dendale
- Radiation Oncology Department, Centre de Protonthérapie d'Orsay, 101, Institut Curie, PSL Research University, 91898, Orsay, France
| | - Annalisa Patriarca
- Radiation Oncology Department, Centre de Protonthérapie d'Orsay, 101, Institut Curie, PSL Research University, 91898, Orsay, France
| | - Catherine Nauraye
- Radiation Oncology Department, Centre de Protonthérapie d'Orsay, 101, Institut Curie, PSL Research University, 91898, Orsay, France
| | - Marine Le Dudal
- Institut Pasteur, Neuropathologie Expérimentale, 75015, Paris, France
- Ecole Nationale Vétérinaire d'Alfort, Biopôle, Unité d'Histologie, d'Embryologie et d'Anatomie Pathologique, Université Paris-Est, Maisons-Alfort, France
| | - Grégory Jouvion
- Institut Pasteur, Neuropathologie Expérimentale, 75015, Paris, France
- Physiopathologie des Maladies Génétiques d'Expression Pédiatrique, Assistance Publique des Hôpitaux de Paris, Hôpital Armand-Trousseau, UF de Génétique Moléculaire, Sorbonne Université, INSERM, Paris, France
| | - David Hardy
- Institut Pasteur, Neuropathologie Expérimentale, 75015, Paris, France
| | - Nicole El Massioui
- Université Paris-Saclay, CNRS, Institut des Neurosciences Paris-Saclay, 91190, Gif-sur-Yvette, France
| | - Yolanda Prezado
- Institut Curie, Inserm U 1021-CNRS UMR 3347, University Paris Saclay, PSL Research University, Bat 110, Campus d'Orsay, Orsay, France.
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18
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Assessment of cognitive and neural recovery in survivors of pediatric brain tumors in a pilot clinical trial using metformin. Nat Med 2020; 26:1285-1294. [PMID: 32719487 DOI: 10.1038/s41591-020-0985-2] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 06/19/2020] [Indexed: 02/06/2023]
Abstract
We asked whether pharmacological stimulation of endogenous neural precursor cells (NPCs) may promote cognitive recovery and brain repair, focusing on the drug metformin, in parallel rodent and human studies of radiation injury. In the rodent cranial radiation model, we found that metformin enhanced the recovery of NPCs in the dentate gyrus, with sex-dependent effects on neurogenesis and cognition. A pilot double-blind, placebo-controlled crossover trial was conducted (ClinicalTrials.gov, NCT02040376) in survivors of pediatric brain tumors who had been treated with cranial radiation. Safety, feasibility, cognitive tests and MRI measures of white matter and the hippocampus were evaluated as endpoints. Twenty-four participants consented and were randomly assigned to complete 12-week cycles of metformin (A) and placebo (B) in either an AB or BA sequence with a 10-week washout period at crossover. Blood draws were conducted to monitor safety. Feasibility was assessed as recruitment rate, medication adherence and procedural adherence. Linear mixed modeling was used to examine cognitive and MRI outcomes as a function of cycle, sequence and treatment. We found no clinically relevant safety concerns and no serious adverse events associated with metformin. Sequence effects were observed for all cognitive outcomes in our linear mixed models. For the subset of participants with complete data in cycle 1, metformin was associated with better performance than placebo on tests of declarative and working memory. We present evidence that a clinical trial examining the effects of metformin on cognition and brain structure is feasible in long-term survivors of pediatric brain tumors and that metformin is safe to use and tolerable in this population. This pilot trial was not intended to test the efficacy of metformin for cognitive recovery and brain growth, but the preliminary results are encouraging and warrant further investigation in a large multicenter phase 3 trial.
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19
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Corti O, Blomgren K, Poletti A, Beart PM. Autophagy in neurodegeneration: New insights underpinning therapy for neurological diseases. J Neurochem 2020; 154:354-371. [PMID: 32149395 DOI: 10.1111/jnc.15002] [Citation(s) in RCA: 77] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 02/27/2020] [Accepted: 03/05/2020] [Indexed: 12/13/2022]
Abstract
In autophagy long-lived proteins, protein aggregates or damaged organelles are engulfed by vesicles called autophagosomes prior to lysosomal degradation. Autophagy dysfunction is a hallmark of several neurodegenerative diseases in which misfolded proteins or dysfunctional mitochondria accumulate. Excessive autophagy can also exacerbate brain injury under certain conditions. In this review, we provide specific examples to illustrate the critical role played by autophagy in pathological conditions affecting the brain and discuss potential therapeutic implications. We show how a singular type of autophagy-dependent cell death termed autosis has attracted attention as a promising target for improving outcomes in perinatal asphyxia and hypoxic-ischaemic injury to the immature brain. We provide evidence that autophagy inhibition may be protective against radiotherapy-induced damage to the young brain. We describe a specialized form of macroautophagy of therapeutic relevance for motoneuron and neuromuscular diseases, known as chaperone-assisted selective autophagy, in which heat shock protein B8 is used to deliver aberrant proteins to autophagosomes. We summarize studies pinpointing mitophagy mediated by the serine/threonine kinase PINK1 and the ubiquitin-protein ligase Parkin as a mechanism potentially relevant to Parkinson's disease, despite debate over the physiological conditions in which it is activated in organisms. Finally, with the example of the autophagy-inducing agent rilmenidine and its discrepant effects in cell culture and mouse models of motor neuron disorders, we illustrate the importance of considering aspects such a disease stage and aggressiveness, type of insult and load of damaged or toxic cellular components, when choosing the appropriate drug, timepoint and duration of treatment.
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Affiliation(s)
- Olga Corti
- Institut National de la Santé et de la Recherche Médicale, Paris, France.,Centre National de la Recherche Scientifique, Paris, France.,Sorbonne Universités, Paris, France.,Institut du Cerveau et de la Moelle épinière, ICM, Paris, France
| | - Klas Blomgren
- Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden.,Department of Paediatric Oncology, Karolinska University Hospital, Stockholm, Sweden
| | - Angelo Poletti
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Centro di Eccellenza sulle Malattie Neurodegenerative, Università degli Studi di Milano, Milan, Italy
| | - Philip M Beart
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, Vic, Australia.,Department of Pharmacology, University of Melbourne, Parkville, Vic, Australia
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20
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Kiryk A, Janusz A, Zglinicki B, Turkes E, Knapska E, Konopka W, Lipp HP, Kaczmarek L. IntelliCage as a tool for measuring mouse behavior - 20 years perspective. Behav Brain Res 2020; 388:112620. [PMID: 32302617 DOI: 10.1016/j.bbr.2020.112620] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 03/23/2020] [Indexed: 12/21/2022]
Abstract
Since the 1980s, we have witnessed the rapid development of genetically modified mouse models of human diseases. A large number of transgenic and knockout mice have been utilized in basic and applied research, including models of neurodegenerative and neuropsychiatric disorders. To assess the biological function of mutated genes, modern techniques are critical to detect changes in behavioral phenotypes. We review the IntelliCage, a high-throughput system that is used for behavioral screening and detailed analyses of complex behaviors in mice. The IntelliCage was introduced almost two decades ago and has been used in over 150 studies to assess both spontaneous and cognitive behaviors. We present a critical analysis of experimental data that have been generated using this device.
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Affiliation(s)
- Anna Kiryk
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Artur Janusz
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Bartosz Zglinicki
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Emir Turkes
- Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University, Irving Medical Center, New York, NY, USA
| | - Ewelina Knapska
- BRAINCITY, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Witold Konopka
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Hans-Peter Lipp
- Institute of Anatomy, University of Zurich, Zurich, Switzerland; Institute of Evolutionary Medicine, University of Zurich, Zurich, Switzerland
| | - Leszek Kaczmarek
- BRAINCITY, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland.
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21
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Lönnerblad M, Van't Hooft I, Blomgren K, Berglund E. A nationwide, population-based study of school grades, delayed graduation, and qualification for school years 10-12, in children with brain tumors in Sweden. Pediatr Blood Cancer 2020; 67:e28014. [PMID: 31595683 DOI: 10.1002/pbc.28014] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 08/28/2019] [Accepted: 09/06/2019] [Indexed: 01/04/2023]
Abstract
BACKGROUND As many as 95.7% of children diagnosed with a brain tumor will experience persistent late effects as adults. These include difficulties with general executive functions, lower IQ, and mental fatigue, which may negatively affect school performance. METHODS Through the Swedish Childhood Cancer Registry, we identified 475 children born between 1988 and 1996, diagnosed with a brain tumor before their 15th birthday. School grades in "Swedish," "mathematics," and "English," if their graduation was delayed, and qualification for school years 10-12 were compared with 2197 matched controls. Furthermore, we checked for interaction effects between sex and age at diagnosis, and possible effects of tumor grade (high or low) as well as parents' education. RESULTS Children treated for a brain tumor performed worse in the subjects compared to controls and also had delayed graduation to a greater extent. Fewer children treated for a brain tumor than controls qualified for school years 10-12. Children treated at a young age, especially females, and children whose parents have low education seem to be at particular risk. Unexpectedly, there were no differences in outcomes between survivors with high- and low-grade tumors. CONCLUSIONS It is important that schools provide regular pedagogical assessment and individualized support to meet the different needs of children treated for a brain tumor. Children treated for low-grade tumors do not perform better than children treated for high-grade tumors, despite the lighter treatment, and hence require the same attention and support.
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Affiliation(s)
- Malin Lönnerblad
- Department of Special Education, Stockholm University, Stockholm, Sweden.,Neuropediatric Unit, Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden
| | - Ingrid Van't Hooft
- Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
| | - Klas Blomgren
- Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden.,Pediatric Oncology, Karolinska University Hospital, Stockholm, Sweden
| | - Eva Berglund
- Department of Special Education, Stockholm University, Stockholm, Sweden
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22
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Ruddy RM, Derkach D, Dadwal P, Morshead CM. Cranial irradiation in juvenile mice leads to early and sustained defects in the stem and progenitor cell pools and late cognitive impairments. Brain Res 2019; 1727:146548. [PMID: 31715143 DOI: 10.1016/j.brainres.2019.146548] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 10/08/2019] [Accepted: 11/08/2019] [Indexed: 12/29/2022]
Abstract
Cranial irradiation is used in combination with other therapies as a treatment for brain tumours and is thought to contribute to long-term cognitive deficits. Several rodent models have demonstrated that these cognitive deficits may be correlated with damage to neural progenitor cells in the subventricular zone (SVZ) and dentate gyrus (DG), the two neurogenic niches of the brain. Studies in rodent models typically assess the proliferating progenitor population, but rarely investigate the effect of cranial irradiation on the neural stem cell pool. Further, few studies evaluate the effects in juveniles, an age when children typically receive this treatment. Herein, we examine the cellular and behavioural effects of juvenile cranial irradiation on stem and progenitor populations in the two neurogenic regions of the brain and assess cognitive outcomes. We found regionally distinct effects of cranial irradiation in the juvenile brain. In the SVZ, we observed a defect in the stem cell pool and a concomitant decrease in proliferating cells that were maintained for at least one week. In the DG, a similar defect in the stem cell pool and proliferating cells was observed and persisted in the stem cell population. Finally, we demonstrated that cranial irradiation resulted in late cognitive deficits. This study demonstrates that juvenile cranial irradiation leads to regionally distinct defects in the stem and progenitor populations, and late cognitive deficits, which may be important factors in determining therapeutic targets and timing of interventions following cranial irradiation.
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Affiliation(s)
- Rebecca M Ruddy
- Institute of Medical Science, University of Toronto, Canada; Terrence Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Canada
| | - Daniel Derkach
- Institute of Medical Science, University of Toronto, Canada; Terrence Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Canada
| | - Parvati Dadwal
- Institute of Medical Science, University of Toronto, Canada; Terrence Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Canada
| | - Cindi M Morshead
- Institute of Medical Science, University of Toronto, Canada; Terrence Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Canada; Division of Anatomy, Department of Surgery, University of Toronto, Canada; Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada; Toronto Rehabilitation Institute (KITE), University Health Network, Toronto, Canada.
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23
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Zhang D, Zhou W, Lam TT, Weng C, Bronk L, Ma D, Wang Q, Duman JG, Dougherty PM, Grosshans DR. Radiation induces age-dependent deficits in cortical synaptic plasticity. Neuro Oncol 2019; 20:1207-1214. [PMID: 29660023 DOI: 10.1093/neuonc/noy052] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Background Radiation-induced cognitive dysfunction is a significant side effect of cranial irradiation for brain tumors. Clinically, pediatric patients are more vulnerable than adults. However, the underlying mechanisms of dysfunction, including reasons for age dependence, are still largely unknown. Previous studies have focused on the loss of hippocampal neuronal precursor cells and deficits in memory. However, survivors may also experience deficits in attention, executive function, or other non-hippocampal-dependent cognitive domains. We hypothesized that brain irradiation induces age-dependent deficits in cortical synaptic plasticity. Methods In vivo recordings were used to test neuronal plasticity along the direct pathway from the cornu ammonis 1 (CA1)/subicular region to the prefrontal cortex (PFC). Specifically, long-term potentiation (LTP) in the CA1/subicular-PFC pathway was assessed after cranial irradiation of juvenile and adult Sprague Dawley rats. We further assessed a potential role for glutamate toxicity by evaluating the potential neuroprotective effects of memantine. Results LTP was greatly inhibited in both adult and juvenile animals at 3 days after radiation but returned to near-normal levels by 8 weeks-only in adult rats. Memantine given before, but not after, irradiation partially prevented LTP inhibition in juvenile and adult rats. Conclusion Cranial radiation impairs neuroplasticity along the hippocampal-PFC pathway; however, its effects vary by age. Pretreatment with memantine offered protection to both juvenile and adult animals. Deficits in cortical plasticity may contribute to radiation-induced cognitive dysfunction, including deficits in attention and age-dependent sensitivity of such pathways, which may underlie differences in clinical outcomes between juveniles and adults after cranial irradiation.
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Affiliation(s)
- Die Zhang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Wei Zhou
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Thanh Thai Lam
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Connie Weng
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Lawrence Bronk
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Duo Ma
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Qiang Wang
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Joseph G Duman
- Department of Neuroscience, Baylor College of Medicine, Houston, Texas
| | - Patrick M Dougherty
- Departments of Pain Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - David R Grosshans
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.,Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
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24
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Chronic disturbance in the thalamus following cranial irradiation to the developing mouse brain. Sci Rep 2019; 9:9588. [PMID: 31270437 PMCID: PMC6610082 DOI: 10.1038/s41598-019-45973-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 06/18/2019] [Indexed: 12/14/2022] Open
Abstract
Better survival rates among pediatric brain tumor patients have resulted in an increased awareness of late side effects that commonly appear following cancer treatment. Radiation-induced changes in hippocampus and white matter are well described, but do not explain the full range of neurological late effects in childhood cancer survivors. The aim of this study was to investigate thalamus following cranial irradiation (CIR) to the developing brain. At postnatal day 14, male mice pups received a single dose of 8 Gy CIR. Cellular effects in thalamus were assessed using immunohistochemistry 4 months after CIR. Interestingly, the density of neurons decreased with 35% (p = 0.0431) and the density of astrocytes increased with 44% (p = 0.011). To investigate thalamic astrocytes, S100β+ cells were isolated by fluorescence-activated cell sorting and genetically profiled using next-generation sequencing. The phenotypical characterization indicated a disrupted function, such as downregulated microtubules’ function, higher metabolic activity, immature phenotype and degraded ECM. The current study provides novel insight into that thalamus, just like hippocampus and white matter, is severely affected by CIR. This knowledge is of importance to understand the late effects seen in pediatric brain tumor survivors and can be used to give them the best suitable care.
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25
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Sun Q, Li M, Wang G, Xu H, He Z, Zhou Y, Zhou Y, Zhou Y, Song H, Jiang H. Distribution of metastasis in the brain in relation to the hippocampus: a retrospective single-center analysis of 565 metastases in 116 patients. Cancer Imaging 2019; 19:2. [PMID: 30670096 PMCID: PMC6341547 DOI: 10.1186/s40644-019-0188-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Accepted: 01/16/2019] [Indexed: 01/01/2023] Open
Abstract
OBJECTIVE To examine the distribution of brain metastases (BM) in relation to the hippocampus, so as to determine the risk of metastasis in the hippocampus, and thus provide experimental evidence for the hippocampal avoidance (HA) in patients with BM during radiotherapy. METHODS (1) For the retrospective analysis of 116 patients diagnosed with malignancies, confirmed as BM, from December 2014 to December 2016 at the First Affiliated Hospital of Bengbu Medical College. We obtained the T1-weighted, postcontrast axial, sagittal, and coronal Magnetic Resonance imaging (MRI) images f the patients, in supine position, using the head restraints and head thermoplastic masks to adjust the positioning, with computed tomography (CT) positioning scan ranging from the head to the mandible (layer thickness: 3 mm). CT and MRI images were fused on a Philips Pinnacle v9.8 treatment planning system;(2) Every metastasis of the 565 metastases was contoured;(3) hippocampus were contoured, and hippocampus with 5 mm expansion envelopes were analyzed;(4) Using the SPSS 16.0 software, we analyzed the relation between the distribution and age, sex, Karnofsky performance status (KPS), primary site, aggregate volume of intracranial metastases and the whole brain. The data were analyzed using a binary logistic regression analysis method, with two-sided P < 0.05 for statistical significance. RESULTS In this study, we recruited 116 patients with 565 metastases. Among them, 1.7% (n = 2) had metastases in the hippocampus, and 11.2% (n = 13) had metastases within 5 mm of the hippocampus, of which more than half were patients with non-small cell lung cancer (n = 7). Using a binary logistic regression to analyze the relation between the metastases located within 5 mm of the hippocampus and age (P = 0.395), sex (P = 0.139), KPS (P = 0.724), primary site (P = 0.894), aggregate volume of intracranial metastases (p = 0.093) and the whole brain (p = 0.998), and none of them showed statistically significant difference between them and the metastases location (P>0.05). CONCLUSION This study showed a low risk for the perihippocampal metastases (PHM) and no significant correlation between PHM and age, sex, KPS, primary site, aggregate volume of intracranial metastases and the whole brain. Accordingly, it is may be acceptable to avoid the perihippocampal region during whole brain radiotherapy.
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Affiliation(s)
- Qian Sun
- Department of Radiation Oncology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004 China
| | - Min Li
- Department of Pharmacy, Bengbu Medical College, Bengbu, 233004 China
| | - Gengming Wang
- Department of Radiation Oncology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004 China
| | - Hongbo Xu
- Department of Radiation Oncology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004 China
| | - Zelai He
- Department of Radiation Oncology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004 China
| | - Yongchun Zhou
- Department of Radiation Oncology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004 China
| | - Yan Zhou
- Department of Radiation Oncology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004 China
| | - Yufu Zhou
- Department of Radiation Oncology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004 China
| | - Hongwei Song
- Department of Radiation Oncology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004 China
| | - Hao Jiang
- Department of Radiation Oncology, The First Affiliated Hospital of Bengbu Medical College, Bengbu, 233004 China
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26
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Beera KG, Li YQ, Dazai J, Stewart J, Egan S, Ahmed M, Wong CS, Jaffray DA, Nieman BJ. Altered brain morphology after focal radiation reveals impact of off-target effects: implications for white matter development and neurogenesis. Neuro Oncol 2019; 20:788-798. [PMID: 29228390 PMCID: PMC5961122 DOI: 10.1093/neuonc/nox211] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Background Children with brain tumors treated with cranial radiation therapy (RT) often exhibit cognitive late effects, commonly associated with reduced white matter (WM) volume and decreased neurogenesis. The impact of radiation damage in particular regions or tissues on brain development as a whole has not been elucidated. Methods We delivered whole-brain or focal radiation (8 Gy single dose) to infant mice. Focal treatments targeted white matter (anterior commissure), neuronal (olfactory bulbs), or neurogenic (subventricular zone) regions. High-resolution ex vivo MRI was used to assess radiation-induced volume differences. Immunohistochemistry for myelin basic protein and doublecortin was performed to assess associated cellular changes within white matter and related to neurogenesis, respectively. Results Both whole-brain and focal RT in infancy resulted in volume deficits in young adulthood, with whole-brain RT resulting in the largest deficits. RT of the anterior commissure, surprisingly, showed no impact on its volume or on brain development as a whole. In contrast, RT of the olfactory bulbs resulted in off-target volume reduction in the anterior commissure and decreased subventricular zone neurogenesis. RT of the subventricular zone likewise produced volume deficits in both the olfactory bulbs and the anterior commissure. Similar off-target effects were found in the corpus callosum and parietal cortex. Conclusions Our results demonstrate that radiation damage locally can have important off-target consequences for brain development. These data suggest that WM may be less radiosensitive than volume change alone would indicate and have implications for region-sparing radiation treatments aimed at reducing cognitive late effects.
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Affiliation(s)
- Kiran G Beera
- Mouse Imaging Centre, Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
| | - Yu-Qing Li
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
| | - Jun Dazai
- Mouse Imaging Centre, Hospital for Sick Children, Toronto, Ontario, Canada
| | - James Stewart
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada
| | - Shannon Egan
- Mouse Imaging Centre, Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Physics, University of McGill, Montreal, Quebec, Canada
| | - Mashal Ahmed
- Mouse Imaging Centre, Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Biology, University of Waterloo, Waterloo, Ontario, Canada
| | - C Shun Wong
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.,Department of Radiation Oncology, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada.,Department of Radiation Oncology, University of Toronto, Toronto, Ontario, Canada
| | - David A Jaffray
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.,Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada.,Princess Margaret Cancer Centre, Radiation Medicine Program, Techna Institute, University Health Network, Toronto, Ontario, Canada
| | - Brian J Nieman
- Mouse Imaging Centre, Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.,Ontario Institute for Cancer Research, Toronto, Ontario, Canada
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27
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Peng S, Yang B, Duan MY, Liu ZW, Wang WF, Zhang XZ, Ren BX, Tang FR. The Disparity of Impairment of Neurogenesis and Cognition After Acute or Fractionated Radiation Exposure in Adolescent BALB/c Mice. Dose Response 2019; 17:1559325818822574. [PMID: 30670940 PMCID: PMC6327339 DOI: 10.1177/1559325818822574] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 09/20/2018] [Accepted: 09/25/2018] [Indexed: 12/31/2022] Open
Abstract
The effect of acute X-ray irradiation with 2 Gy or fractionated exposure with 0.2 Gy continuously for 10 days (0.2 Gy × 10 = 2 Gy) was evaluated in the postnatal day 21 (P21) BALB/c mouse model. Both acute and fractionated irradiation induced impairment of cell proliferation and neurogenesis in the subgranular zone of the dentate gyrus labeled by Ki67 and doublecortin, respectively. Parvalbumin immunopositive interneurons in the subgranular zone were also reduced significantly. However, the 2 patterns of irradiation did not affect animal weight gain when measured at ages of P90 and P180 or 69 and 159 days after irradiation. Behavioral tests indicated that neither acute nor fractionated irradiation with a total dose of 2 Gy induced deficits in the contextual fear or spatial memory and memory for novel object recognition. Animal motor activity was also not affected in the open-field test. The disparity of the impairment of neurogenesis and unaffected cognition suggests that the severity of impairment of neurogenesis induced by acute or fractionated irradiation with a total dose of 2 Gy at P21 may not be worse enough to induce the deficit of cognition.
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Affiliation(s)
- Shuang Peng
- Health Center of Yangtze University, Jingzhou, Hubei, China
| | - Bo Yang
- Department of Medical Imaging Center, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei, People's Republic of China
| | - Meng Yun Duan
- Health Center of Yangtze University, Jingzhou, Hubei, China
| | - Zi Wei Liu
- Health Center of Yangtze University, Jingzhou, Hubei, China
| | - Wei Feng Wang
- Health Center of Yangtze University, Jingzhou, Hubei, China
| | - Xiang Zhi Zhang
- Affiliated Hospital of Yangtze University, Jingzhou, Hubei, People's Republic of China
| | - Bo Xu Ren
- Health Center of Yangtze University, Jingzhou, Hubei, China
| | - Feng Ru Tang
- Radiation Physiology Laboratory, Singapore Nuclear Research and Safety Initiative, National University of Singapore, Singapore
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28
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Sato Y, Shinjyo N, Sato M, Nilsson MKL, Osato K, Zhu C, Pekna M, Kuhn HG, Blomgren K. Grafting Neural Stem and Progenitor Cells Into the Hippocampus of Juvenile, Irradiated Mice Normalizes Behavior Deficits. Front Neurol 2018; 9:715. [PMID: 30254600 PMCID: PMC6141740 DOI: 10.3389/fneur.2018.00715] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 08/08/2018] [Indexed: 11/17/2022] Open
Abstract
The pool of neural stem and progenitor cells (NSPCs) in the dentate gyrus of the hippocampus is reduced by ionizing radiation. This explains, at least partly, the learning deficits observed in patients after radiotherapy, particularly in pediatric cases. An 8 Gy single irradiation dose was delivered to the whole brains of postnatal day 9 (P9) C57BL/6 mice, and BrdU-labeled, syngeneic NSPCs (1.0 × 105 cells/injection) were grafted into each hippocampus on P21. Three months later, behavior tests were performed. Irradiation impaired novelty-induced exploration, place learning, reversal learning, and sugar preference, and it altered the movement pattern. Grafting of NSPCs ameliorated or even normalized the observed deficits. Less than 4% of grafted cells survived and were found in the dentate gyrus 5 months later. The irradiation-induced loss of endogenous, undifferentiated NSPCs in the dentate gyrus was completely restored by grafted NSPCs in the dorsal, but not the ventral, blade. The grafted NSPCs did not exert appreciable effects on the endogenous NSPCs; however, more than half of the grafted NSPCs differentiated. These results point to novel strategies aimed at ameliorating the debilitating late effects of cranial radiotherapy, particularly in children.
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Affiliation(s)
- Yoshiaki Sato
- Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden.,Division of Neonatology, Center for Maternal-Neonatal Care, Nagoya University Hospital, Nagoya, Japan
| | - Noriko Shinjyo
- Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
| | - Machiko Sato
- Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden.,Department of Obstetrics and Gynecology, Narita Hospital, Nagoya, Japan
| | - Marie K L Nilsson
- Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
| | - Kazuhiro Osato
- Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden.,Department of Obstetrics and Gynecology, Mie University, Tsu, Japan
| | - Changlian Zhu
- Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden.,Department of Pediatrics, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Marcela Pekna
- Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
| | - Hans G Kuhn
- Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
| | - Klas Blomgren
- Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden.,Department of Pediatric Oncology, Karolinska University Hospital, Stockholm, Sweden.,Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
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Increased Synthesis of Chondroitin Sulfate Proteoglycan Promotes Adult Hippocampal Neurogenesis in Response to Enriched Environment. J Neurosci 2018; 38:8496-8513. [PMID: 30126967 DOI: 10.1523/jneurosci.0632-18.2018] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 08/06/2018] [Accepted: 08/15/2018] [Indexed: 12/12/2022] Open
Abstract
Chondroitin sulfate proteoglycan (CSPG) is a candidate regulator of embryonic neurogenesis. The aim of this study was to specify the functional significance of CSPG in adult hippocampal neurogenesis using male mice. Here, we showed that neural stem cells and neuronal progenitors in the dentate gyrus were covered in part by CSPG. Pharmacological depletion of CSPG in the dentate gyrus reduced the densities of neuronal progenitors and newborn granule cells. 3D reconstruction of newborn granule cells showed that their maturation was inhibited by CSPG digestion. The novel object recognition test revealed that CSPG digestion caused cognitive memory impairment. Western blot analysis showed that expression of β-catenin in the dentate gyrus was decreased by CSPG digestion. The amount of CSPG in the dentate gyrus was increased by enriched environment (EE) and was decreased by forced swim stress. In addition, EE accelerated the recovery of CSPG expression in the dentate gyrus from the pharmacological depletion and promoted the restoration of granule cell production. Conversely, the densities of newborn granule cells were also decreased in mice that lacked chondroitin sulfate N-acetylgalactosaminyltransferase 1 (CSGalNAcT1), a key enzyme for CSPG synthesis (T1KO mice). The capacity of EE to promote granule cell production and improve cognitive memory was impaired in T1KO mice. These findings indicate that CSPG is involved in the regulation of adult hippocampal neurogenesis and suggest that increased synthesis of CSPG by CSGalNacT1 may mediate promotion of granule cell production and improvement of cognitive memory in response to EE.SIGNIFICANCE STATEMENT Chondroitin sulfate proteoglycan (CSPG) is a candidate regulator of embryonic neurogenesis. Here, we specified the role of CSPG in adult neurogenesis in the mouse hippocampus. Digestion of CSPG in the dentate gyrus impaired granule cell production and cognitive memory. Enriched environment (EE) promoted the recovery of CSPG expression and granule cell production from the CSPG digestion. Additionally, adult neurogenesis was impaired in mice that lacked a key enzyme for CSPG synthesis (T1KO mice). The capacity of EE to promote granule cell production and cognitive memory was impaired in T1KO mice. Altogether, these findings indicate that CSPG underlies adult hippocampal neurogenesis and suggest that increased synthesis of CSPG may mediate promotion of granule cell production in response to EE.
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Perez EC, Rodgers SP, Inoue T, Pedersen SE, Leasure JL, Gaber MW. Olfactory Memory Impairment Differs by Sex in a Rodent Model of Pediatric Radiotherapy. Front Behav Neurosci 2018; 12:158. [PMID: 30116180 PMCID: PMC6084003 DOI: 10.3389/fnbeh.2018.00158] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 07/09/2018] [Indexed: 11/24/2022] Open
Abstract
Although an effective treatment for pediatric brain tumors, cranial radiation therapy (CRT) damages surrounding healthy tissue, thereby disrupting brain development. Animal models of pediatric CRT have primarily relied on visual tasks to assess cognitive impairment. Moreover, there has been a lack of sex comparisons as most research on the cognitive effects of pediatric CRT does not include females. Therefore, we utilized olfaction, an ethologically relevant sensory modality, to assess cognitive impairment in an animal model of CRT that included both male and female mice. Specifically, we used the novel odor recognition (NOdorR) task with social odors to test recognition memory, a cognitive parameter that has been associated with olfactory neurogenesis, a form of cellular plasticity damaged by CRT. In addition to odor recognition memory, olfactory ability or discrimination of non-social and social odors were assessed both acutely and 3 months after CRT. Magnetic resonance imaging (MRI) and histology were performed after behavioral testing to assess long-term damage by CRT. Long-term but not acute radiation-induced impairment in odor recognition memory was observed, consistent with delayed onset of cognitive impairment in human patients. Males showed greater exploration of social odors than females, but general exploration was not affected by irradiation. However, irradiated males had impaired odor recognition memory in adulthood, compared to non-irradiated males (or simply male controls). Female olfactory recognition memory, in contrast, was dependent on estrus stage. CRT damage was demonstrated by (1) histological evaluation of olfactory neurogenesis, which suggested a reduction in CRT versus control, and (2) imaging analyses which showed that the majority of brain regions were reduced in volume by CRT. Specifically, two regions involved in social odor processing (amygdala and piriform cortex) were damaged by cranial irradiation in males but not females, paralleling olfactory recognition findings.
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Affiliation(s)
- Emma C Perez
- Behavioral Neuroscience Lab, Department of Psychology, University of Houston, Houston, TX, United States.,Texas Children's Cancer Center, Department of Pediatrics, Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX, United States
| | - Shaefali P Rodgers
- Behavioral Neuroscience Lab, Department of Psychology, University of Houston, Houston, TX, United States
| | - Taeko Inoue
- Texas Children's Cancer Center, Department of Pediatrics, Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX, United States
| | - Steen E Pedersen
- Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX, United States.,Department of Physiology and Biochemistry, Ross University School of Medicine, Roseau, Dominica
| | - J Leigh Leasure
- Behavioral Neuroscience Lab, Department of Psychology, University of Houston, Houston, TX, United States.,Department of Biology and Biochemistry, University of Houston, Houston, TX, United States
| | - M Waleed Gaber
- Texas Children's Cancer Center, Department of Pediatrics, Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX, United States.,Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX, United States
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31
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Effects of p21 on adult hippocampal neuronal development after irradiation. Cell Death Discov 2018; 4:15. [PMID: 30210818 PMCID: PMC6131552 DOI: 10.1038/s41420-018-0081-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 06/18/2018] [Accepted: 06/22/2018] [Indexed: 12/27/2022] Open
Abstract
Inhibition of hippocampal neurogenesis is implicated in neurocognitive impairment after cranial irradiation. We recently demonstrated that disruption of neuronal development after DNA damage was regulated by p53. The cyclin-dependent kinase inhibitor 1 or p21, a downstream effector p53, mediates cell cycle arrest in response to DNA damage. There is evidence that p21 negatively regulates proliferation of neural progenitors (NPCs). Here we characterized the effects of p21 on disruption of neuronal development in the hippocampal dentate gyrus after irradiation. We irradiated young adult mice wild type (+/+) or knockout (−/−) of the Cdkn1a (p21) gene, and used different bromodeoxyuridine (BrdU) paradigms for cell fate mapping. The acute apoptotic response of NPCs in the subgranular zone of the dentate gyrus was independent of p21 after irradiation. In nonirradiated mice, p21 knockout resulted in an increase in neuroblast proliferation and neurogenesis. At 9 weeks after 5Gy, NPCs in the subgranular zone demonstrated increased p21 expression. Loss of newborn type-1 cells and disruption of hippocampal neurogenesis was evident at 9 weeks after irradiation, and these effects were independent of p21 genotype status. Within the developmental milestones of NPCs, irradiation resulted in loss of early intermediate NPCs (type-2a cells) in wild-type mice, whereas the principal effect of irradiation with p21 loss was culling of proliferating late intermediate (type-2b cells) and neuroblasts. These results suggest that p21 exerts differential effects on cell fate of NPCs after irradiation. p21 may serve to protect proliferating late NPCs but does not alter the ultimate inhibition of new neuron production after DNA damage.
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Hain EG, Sparenberg M, Rasińska J, Klein C, Akyüz L, Steiner B. Indomethacin promotes survival of new neurons in the adult murine hippocampus accompanied by anti-inflammatory effects following MPTP-induced dopamine depletion. J Neuroinflammation 2018; 15:162. [PMID: 29803225 PMCID: PMC5970532 DOI: 10.1186/s12974-018-1179-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Accepted: 04/25/2018] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Parkinson's disease (PD) is characterized by dopaminergic cell loss and inflammation in the substantia nigra (SN) leading to motor deficits but also to hippocampus-associated non-motor symptoms such as spatial learning and memory deficits. The cognitive decline is correlated with impaired adult hippocampal neurogenesis resulting from dopamine deficit and inflammation, represented in the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine hydrochloride (MPTP) mouse model of PD. In the inflammatory tissue, cyclooxygenase (COX) is upregulated leading to an ongoing inflammatory process such as prostaglandin-mediated increased cytokine levels. Therefore, inhibition of COX by indomethacin may prevent the inflammatory response and the impairment of adult hippocampal neurogenesis. METHODS Wildtype C57Bl/6 and transgenic Nestin-GFP mice were treated with MPTP followed by short-term or long-term indomethacin treatment. Then, aspects of inflammation and neurogenesis were evaluated by cell counts using immunofluorescence and immunohistochemical stainings in the SN and dentate gyrus (DG). Furthermore, hippocampal mRNA expression of neurogenesis-related genes of the Notch, Wnt, and sonic hedgehog signaling pathways and neurogenic factors were assessed, and protein levels of serum cytokines were measured. RESULTS Indomethacin restored the reduction of the survival rate of new mature neurons and reduced the amount of amoeboid CD68+ cells in the DG after MPTP treatment. Indomethacin downregulated genes of the Wnt and Notch signaling pathways and increased neuroD6 expression. In the SN, indomethacin reduced the pro-inflammatory cellular response without reversing dopaminergic cell loss. CONCLUSION Indomethacin has a pro-neurogenic and thereby restorative effect and an anti-inflammatory effect on the cellular level in the DG following MPTP treatment. Therefore, COX inhibitors such as indomethacin may represent a therapeutic option to restore adult neurogenesis in PD.
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Affiliation(s)
- Elisabeth G Hain
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt - Universität zu Berlin and Berlin Institute of Health, Department of Neurology with Experimental Neurology, Charitéplatz 1, 10117, Berlin, Germany.
| | - Maria Sparenberg
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt - Universität zu Berlin and Berlin Institute of Health, Department of Neurology with Experimental Neurology, Charitéplatz 1, 10117, Berlin, Germany
| | - Justyna Rasińska
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt - Universität zu Berlin and Berlin Institute of Health, Department of Neurology with Experimental Neurology, Charitéplatz 1, 10117, Berlin, Germany
| | - Charlotte Klein
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt - Universität zu Berlin and Berlin Institute of Health, Department of Neurology with Experimental Neurology, Charitéplatz 1, 10117, Berlin, Germany
| | - Levent Akyüz
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt - Universität zu Berlin, and Berlin Institute of Health, Institute for Medical Immunology, Augustenburger Platz 1, 13353, Berlin, Germany.,Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt - Universität zu Berlin, and Berlin Institute of Health, Berlin-Brandenburg Center for Regenerative Therapies (BCRT), Augustenburger Platz 1, 13353, Berlin, Germany
| | - Barbara Steiner
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt - Universität zu Berlin and Berlin Institute of Health, Department of Neurology with Experimental Neurology, Charitéplatz 1, 10117, Berlin, Germany
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Boström M, Kalm M, Eriksson Y, Bull C, Ståhlberg A, Björk-Eriksson T, Hellström Erkenstam N, Blomgren K. A role for endothelial cells in radiation-induced inflammation. Int J Radiat Biol 2018; 94:259-271. [PMID: 29359989 DOI: 10.1080/09553002.2018.1431699] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
PURPOSE To unravel the role of the vasculature in radiation-induced brain tissue damage. MATERIALS AND METHODS Postnatal day 14 mice received a single dose of 10 Gy cranial irradiation and were sacrificed 6 h, 24 h or 7 days post-irradiation. Endothelial cells were isolated from the hippocampus and cerebellum using fluorescence-activated cell sorting, followed by cell cycle analysis and gene expression profiling. RESULTS Flow cytometric analysis revealed that irradiation increased the percentage of endothelial cells, relative to the whole cell population in both the hippocampus and the cerebellum. This change in cell distribution indicates that other cell types are more susceptible to irradiation-induced cell death, compared to endothelial cells. This was supported by data showing that genes involved in endothelial cell-specific apoptosis (e.g. Smpd1) were not induced at any time point investigated but that genes involved in cell-cycle arrest (e.g. Cdkn1a) were upregulated at all investigated time points, indicating endothelial cell repair. Inflammation-related genes, on the other hand, were strongly induced, such as Ccl2, Ccl11 and Il6. CONCLUSIONS We conclude that endothelial cells are relatively resistant to ionizing radiation but that they play an active, hitherto unknown, role in the inflammatory response after irradiation. In the current study, this was shown in both the hippocampus, where neurogenesis and extensive cell death after irradiation occurs, and in the cerebellum, where neurogenesis no longer occurs at this developmental age.
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Affiliation(s)
- Martina Boström
- a Center for Brain Repair and Rehabilitation , Institute of Neuroscience and Physiology, University of Gothenburg , Gothenburg , Sweden.,b Department of Oncology , Institute of Clinical Sciences, University of Gothenburg , Gothenburg , Sweden.,c Department of Pharmacology , Institute of Neuroscience and Physiology, University of Gothenburg , Gothenburg , Sweden
| | - Marie Kalm
- a Center for Brain Repair and Rehabilitation , Institute of Neuroscience and Physiology, University of Gothenburg , Gothenburg , Sweden.,c Department of Pharmacology , Institute of Neuroscience and Physiology, University of Gothenburg , Gothenburg , Sweden
| | - Yohanna Eriksson
- c Department of Pharmacology , Institute of Neuroscience and Physiology, University of Gothenburg , Gothenburg , Sweden
| | - Cecilia Bull
- b Department of Oncology , Institute of Clinical Sciences, University of Gothenburg , Gothenburg , Sweden
| | - Anders Ståhlberg
- d Department of Pathology and Genetics , Sahlgrenska Cancer Centre, Institute of Biomedicine, University of Gothenburg , Gothenburg , Sweden
| | - Thomas Björk-Eriksson
- b Department of Oncology , Institute of Clinical Sciences, University of Gothenburg , Gothenburg , Sweden
| | - Nina Hellström Erkenstam
- a Center for Brain Repair and Rehabilitation , Institute of Neuroscience and Physiology, University of Gothenburg , Gothenburg , Sweden
| | - Klas Blomgren
- a Center for Brain Repair and Rehabilitation , Institute of Neuroscience and Physiology, University of Gothenburg , Gothenburg , Sweden.,e Department of Pediatric Oncology , Karolinska University Hospital , Stockholm , Sweden.,f Department of Women's and Children's Health , Karolinska Institutet, Karolinska University Hospital , Stockholm , Sweden
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Kalm M, Andreasson U, Björk-Eriksson T, Zetterberg H, Pekny M, Blennow K, Pekna M, Blomgren K. C3 deficiency ameliorates the negative effects of irradiation of the young brain on hippocampal development and learning. Oncotarget 2017; 7:19382-94. [PMID: 27029069 PMCID: PMC4991390 DOI: 10.18632/oncotarget.8400] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Accepted: 03/09/2016] [Indexed: 02/06/2023] Open
Abstract
Radiotherapy in the treatment of pediatric brain tumors is often associated with debilitating late-appearing adverse effects, such as intellectual impairment. Areas in the brain harboring stem cells are particularly sensitive to irradiation (IR) and loss of these cells may contribute to cognitive deficits. It has been demonstrated that IR-induced inflammation negatively affects neural progenitor differentiation. In this study, we used mice lacking the third complement component (C3−/−) to investigate the role of complement in a mouse model of IR-induced injury to the granule cell layer (GCL) of the hippocampus. C3−/− and wild type (WT) mice received a single, moderate dose of 8 Gy to the brain on postnatal day 10. The C3−/− mice displayed 55 % more microglia (Iba-1+) and a trend towards increase in proliferating cells in the GCL compared to WT mice 7 days after IR. Importantly, months after IR C3−/− mice made fewer errors than WT mice in a reversal learning test indicating better learning capacity in C3−/− mice after IR. Notably, months after IR C3−/− and WT mice had similar GCL volumes, survival of newborn cells (BrdU), microglia (Iba-1) and astrocyte (S100β) numbers in the GCL. In summary, our data show that the complement system contributes to IR-induced loss of proliferating cells and maladaptive inflammatory responses in the acute phase after IR, leading to impaired learning capacity in adulthood. Targeting the complement system is hence promising for future strategies to reduce the long-term adverse consequences of IR in the young brain.
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Affiliation(s)
- Marie Kalm
- Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
| | - Ulf Andreasson
- Clinical Neurochemistry Laboratory, Institute of Neuroscience and Physiology, University of Gothenburg, Sahlgrenska University Hospital, Mölndal, Sweden
| | | | - Henrik Zetterberg
- Clinical Neurochemistry Laboratory, Institute of Neuroscience and Physiology, University of Gothenburg, Sahlgrenska University Hospital, Mölndal, Sweden.,Department of Molecular Neuroscience, UCL Institute of Neurology, Queen Square, London, UK
| | - Milos Pekny
- Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden.,Florey Institute of Neuroscience and Mental Health, Parkville, Victoria, Australia.,Hunter Medical Research Institute, University of Newcastle, New South Wales, Australia
| | - Kaj Blennow
- Clinical Neurochemistry Laboratory, Institute of Neuroscience and Physiology, University of Gothenburg, Sahlgrenska University Hospital, Mölndal, Sweden
| | - Marcela Pekna
- Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden.,Florey Institute of Neuroscience and Mental Health, Parkville, Victoria, Australia.,Hunter Medical Research Institute, University of Newcastle, New South Wales, Australia
| | - Klas Blomgren
- Department of Women's and Children's Health, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden
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Yousuf S, Brat DJ, Shu HK, Wang Y, Stein DG, Atif F. Progesterone improves neurocognitive outcomes following therapeutic cranial irradiation in mice. Horm Behav 2017; 96:21-30. [PMID: 28866326 DOI: 10.1016/j.yhbeh.2017.08.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 07/20/2017] [Accepted: 08/23/2017] [Indexed: 12/13/2022]
Abstract
Despite improved therapeutic methods, CNS toxicity resulting from cancer treatment remains a major cause of post-treatment morbidity. More than half of adult patients with cranial irradiation for brain cancer develop neurobehavioral/cognitive deficits that severely impact quality of life. We examined the neuroprotective effects of the neurosteroid progesterone (PROG) against ionizing radiation (IR)-induced neurobehavioral/cognitive deficits in mice. Male C57/BL mice were exposed to one of two fractionated dose regimens of IR (3Gy×3 or 3Gy×5). PROG (16mg/kg; 0.16mg/g) was given as a pre-, concurrent or post-IR treatment for 14days. Mice were tested for short- and long-term effects of IR and PROG on neurobehavioral/cognitive function on days 10 and 30 after IR treatment. We evaluated both hippocampus-dependent and -independent memory functions. Locomotor activity, elevated plus maze, novel object recognition and Morris water maze tests revealed behavioral deficits following IR. PROG treatment produced improvement in behavioral performance at both time points in the mice given IR. Western blot analysis of hippocampal and cortical tissue showed that IR at both doses induced astrocytic activation (glial fibrillary acidic protein), reactive macrophages/microglia (CD68) and apoptosis (cleaved caspase-3) and PROG treatment inhibited these markers of brain injury. There was no significant difference in the degree of deficit in any test between the two dose regimens of IR at either time point. These findings could be important in the context of patients with brain tumors who may undergo radiotherapy and eventually develop cognitive deficits.
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Affiliation(s)
- Seema Yousuf
- Brain Research Laboratory, Department of Emergency Medicine, 1365 B Clifton Rd NE, Suite 5100, Atlanta, GA 30322, USA.
| | - Daniel J Brat
- Department of Pathology, Emory University Hospital Room H183, 1364 Clifton Rd NE, Atlanta, GA 30322, USA.
| | - Hui-Kuo Shu
- Department of Radiation Oncology, 1365 C Clifton Rd NE, Emory University School of Medicine, Atlanta, GA 30322, USA.
| | - Ya Wang
- Department of Radiation Oncology, 1365 C Clifton Rd NE, Emory University School of Medicine, Atlanta, GA 30322, USA.
| | - Donald G Stein
- Brain Research Laboratory, Department of Emergency Medicine, 1365 B Clifton Rd NE, Suite 5100, Atlanta, GA 30322, USA.
| | - Fahim Atif
- Brain Research Laboratory, Department of Emergency Medicine, 1365 B Clifton Rd NE, Suite 5100, Atlanta, GA 30322, USA.
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36
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Fu Z, Zhao Y, Zhang K, Wang J, Zhang M, Zhao X. Age-Dependent Responses of Brain Myelin Integrity and Behavioral Performance to Radiation in Mice. Radiat Res 2017; 188:505-516. [PMID: 28937316 DOI: 10.1667/rr14732.1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Radiation therapy is widely used to treat primary and metastatic brain tumors, but it may also lead to delayed neurological complications. Oligodendrocytes in the central nervous system produce myelin, and myelin integrity becomes highly vulnerable after brain irradiation. In this study, mice at different developmental stages were used to test the age-dependent sensitivity of myelin formation and maintenance, as well as behavioral performance after whole-brain irradiation (WBI). Mice at postnatal days 21 and 28 and at 2 months received a single dose of 25 Gy WBI. Behavioral tests for general locomotor activity and motor coordination revealed an age-dependent response after WBI. Quantitative observation revealed a sharp decrease in the number of oligodendrocytes beginning at day 1 after WBI, which recovered during different observation intervals in white matter and gray matter in mice of different ages. Myelin basic protein (MBP) staining revealed disparate quantities in an age- and brain-region-dependent pattern between groups after WBI, which was confirmed using Black-Gold staining. In summary, the response to radiation in mice of different ages provided insight into the potential of oligogenesis in microenvironments at respective stages of myelin regeneration, which may reduce central nervous system impairment and optimize the prognosis after radiation treatment.
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Affiliation(s)
- Zhimeng Fu
- a Department of Neurobiology and Collaborative Innovation Center for Brain Science, School of Basic Medicine, Fourth Military Medical University, Xi'an 710032 China
| | - Yunfei Zhao
- a Department of Neurobiology and Collaborative Innovation Center for Brain Science, School of Basic Medicine, Fourth Military Medical University, Xi'an 710032 China.,b 93514 Hospital, Tangshan 064200 China
| | - Kaixiang Zhang
- a Department of Neurobiology and Collaborative Innovation Center for Brain Science, School of Basic Medicine, Fourth Military Medical University, Xi'an 710032 China
| | - Jian Wang
- a Department of Neurobiology and Collaborative Innovation Center for Brain Science, School of Basic Medicine, Fourth Military Medical University, Xi'an 710032 China
| | - Min Zhang
- a Department of Neurobiology and Collaborative Innovation Center for Brain Science, School of Basic Medicine, Fourth Military Medical University, Xi'an 710032 China
| | - Xianghui Zhao
- a Department of Neurobiology and Collaborative Innovation Center for Brain Science, School of Basic Medicine, Fourth Military Medical University, Xi'an 710032 China
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Li Y, Kim J. Distinct roles of neuronal and microglial CB2 cannabinoid receptors in the mouse hippocampus. Neuroscience 2017; 363:11-25. [PMID: 28888955 DOI: 10.1016/j.neuroscience.2017.08.053] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 08/06/2017] [Accepted: 08/29/2017] [Indexed: 01/03/2023]
Abstract
The effects of cannabinoids are primarily mediated by type-1 cannabinoid receptors in the brain and type-2 cannabinoid receptors (CB2Rs) in the peripheral immune system. However, recent evidence demonstrates that CB2Rs are also expressed in the brain and implicated in neuropsychiatric effects. Diverse types of cells in various regions in the brain express CB2Rs but the cellular loci of CB2Rs that induce specific behavioral effects have not been determined. To manipulate CB2R expression in specific types of cells in the dorsal hippocampus of adult mice, we used Cre-dependent overexpression and CRISPR-Cas9 genome-editing techniques in combination with adeno-associated viruses and transgenic mice. Elevation and disruption of CB2R expression in microglia in the CA1 area increased and decreased, respectively, contextual fear memory. In CA1 pyramidal neurons, disruption of CB2R expression enhanced spatial working memory, whereas their overexpression reduced anxiety levels assessed asan increase in the exploration time in the central area of open field. Interneuronal CB2Rs were not involved in the modulation of cognitive or emotional behaviors tested in this study. The targeted manipulation of CB2R expression in pyramidal neurons and microglia suggests that CB2Rs in different types of cells in the mature hippocampus play distinct roles in the regulation of memory and anxiety.
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Affiliation(s)
- Yong Li
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA.
| | - Jimok Kim
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA; Department of Neurology, Medical College of Georgia, Augusta University, Augusta, GA 30912, USA
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Home sweet home: the neural stem cell niche throughout development and after injury. Cell Tissue Res 2017; 371:125-141. [PMID: 28776186 DOI: 10.1007/s00441-017-2658-0] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Accepted: 05/29/2017] [Indexed: 12/26/2022]
Abstract
Neural stem cells and their progeny reside in two distinct neurogenic niches within the mammalian brain: the subventricular zone and the dentate gyrus. The interplay between the neural stem cells and the niche in which they reside can have significant effects on cell kinetics and neurogenesis. A comprehensive understanding of the changes to the niche that occur through postnatal development and aging, as well as following injury, is relevant for developing therapeutics and interventions to promote neural repair. We discuss changes that occur within the neural stem and progenitor cell populations, the vasculature, extracellular matrix, microglia, and secreted proteins through aging which impact cell behavior within the neurogenic niches. We examine neural precursor cell and niche responses to injury in neonatal hypoxia-ischemia, juvenile cranial irradiation, and adult stroke. This review examines the interplay between the niche and stem cell behavior through aging and following injury as a means to understand intrinsic and extrinsic factors that regulate neurogenesis in vivo.
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Tang FR, Loke WK, Wong P, Khoo BC. Radioprotective effect of ursolic acid in radiation-induced impairment of neurogenesis, learning and memory in adolescent BALB/c mouse. Physiol Behav 2017; 175:37-46. [PMID: 28341234 DOI: 10.1016/j.physbeh.2017.03.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 03/13/2017] [Accepted: 03/20/2017] [Indexed: 10/19/2022]
Abstract
The effect of acute irradiation with 5Gy or fractionated exposure with 0.5Gy continuously for 10days (a total dose of 5Gy) was evaluated in an immature BALB/c mouse model. Radioprotective effect of ursolic acid (at 25mg/kg/daily administered 1h after acute or each of fractionated irradiations, and continuously for 30days) was also investigated. We found that both acute and fractionated irradiation at a total dose of 5Gy did not induce any mortality within 30days after exposure to postnatal day 26 (P26) BALB/c mice, but reduced animal weigh gain in the first few weeks. At 90days after irradiation, the weight of animals with acute irradiation was still significantly lower than the control group; no significant difference though was observed for those fractionatedly exposed mice compared to the control group. Behavioral tests indicated that acute irradiation at 5Gy induced deficits in learning and memory in the contextual fear conditioning test. The memory for novel object recognition was also impaired. Similar changes were not observed in mice with fractionated irradiation. Immunohistochemical study demonstrated clearly that acute and fractionated irradiations induced impairment of neurogenesis in the subgranular zone (SGZ) of the dentate gyrus although fractionated exposure induced much lesser loss of newly generated neurons. Ursolic acid administered at 25mg/kg/daily for 30days after irradiation greatly improved acute irradiation-induced deficits in contextual learning and memory and in novel object recognition memory although it exacerbated radiation-induced reduction of neurogenesis in SGZ.
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Affiliation(s)
- Feng Ru Tang
- Radiation Physiology Laboratory, Singapore Nuclear Research and Safety initiative, National University of Singapore, 1 CREATE Way #04-01, CREATE Tower, 138602, Singapore.
| | - Weng Keong Loke
- Defence Medical and Environmental Research Institute, DSO National Laboratories, 11 Stockport Road, 11760, Singapore
| | - Peiyan Wong
- Neuroscience Phenotyping Core, Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, 117456, Singapore
| | - Boo Cheong Khoo
- Temasek Laboratories, National University of Singapore, 5A, Engineering Drive 1, 117411, Singapore
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Zhou K, Xie C, Wickström M, Dolga AM, Zhang Y, Li T, Xu Y, Culmsee C, Kogner P, Zhu C, Blomgren K. Lithium protects hippocampal progenitors, cognitive performance and hypothalamus-pituitary function after irradiation to the juvenile rat brain. Oncotarget 2017; 8:34111-34127. [PMID: 28415806 PMCID: PMC5470955 DOI: 10.18632/oncotarget.16292] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 03/01/2017] [Indexed: 11/25/2022] Open
Abstract
Cranial radiotherapy in children typically causes delayed and progressive cognitive dysfunction and there is no effective preventive strategy for radiation-induced cognitive impairments. Here we show that lithium treatment reduced irradiation-induced progenitor cell death in the subgranular zone of the hippocampus, and subsequently ameliorated irradiation-reduced neurogenesis and astrogenesis in the juvenile rat brain. Irradiation-induced memory impairment, motor hyperactivity and anxiety-like behaviour were normalized by lithium treatment. Late-onset irradiation-induced hypopituitarism was prevented by lithium treatment. Additionally, lithium appeared relatively toxic to multiple cultured tumour cell lines, and did not improve viability of radiated DAOY cells in vitro. In summary, our findings demonstrate that lithium can be safely administered to prevent both short- and long-term injury to the juvenile brain caused by ionizing radiation.
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Affiliation(s)
- Kai Zhou
- Centre for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
- Karolinska Institutet, Department of Women's and Children's Health, Stockholm, Sweden
| | - Cuicui Xie
- Centre for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
- Henan Key Laboratory of Child Brain Injury, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Malin Wickström
- Centre for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
| | - Amalia M. Dolga
- Institute of Pharmacology and Clinical Pharmacy, University of Marburg, Marburg, Germany
- Department of Molecular Pharmacology, University of Groningen, Groningen Research Institute of Pharmacy, Groningen, The Netherlands
| | - Yaodong Zhang
- Centre for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
- Department of Paediatrics, Zhengzhou Children's Hospital, Zhengzhou, China
| | - Tao Li
- Centre for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
- Henan Key Laboratory of Child Brain Injury, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Department of Paediatrics, Zhengzhou Children's Hospital, Zhengzhou, China
| | - Yiran Xu
- Centre for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
- Henan Key Laboratory of Child Brain Injury, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Carsten Culmsee
- Institute of Pharmacology and Clinical Pharmacy, University of Marburg, Marburg, Germany
| | - Per Kogner
- Karolinska Institutet, Department of Women's and Children's Health, Stockholm, Sweden
- Department of Paediatric Oncology, Karolinska University Hospital, Stockholm, Sweden
| | - Changlian Zhu
- Centre for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
- Henan Key Laboratory of Child Brain Injury, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Klas Blomgren
- Karolinska Institutet, Department of Women's and Children's Health, Stockholm, Sweden
- Department of Paediatric Oncology, Karolinska University Hospital, Stockholm, Sweden
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41
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Tang FR, Loke WK, Khoo BC. Postnatal irradiation-induced hippocampal neuropathology, cognitive impairment and aging. Brain Dev 2017; 39:277-293. [PMID: 27876394 DOI: 10.1016/j.braindev.2016.11.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 11/04/2016] [Accepted: 11/04/2016] [Indexed: 12/26/2022]
Abstract
Irradiation of the brain in early human life may set abnormal developmental events into motion that last a lifetime, leading to a poor quality of life for affected individuals. While the effect of irradiation at different early developmental stages on the late human life has not been investigated systematically, animal experimental studies suggest that acute postnatal irradiation with ⩾0.1Gy may significantly reduce neurogenesis in the dentate gyrus and endotheliogenesis in cerebral vessels and induce cognitive impairment and aging. Fractionated irradiation also reduces neurogenesis. Furthermore, irradiation induces hippocampal neuronal loss in CA1 and CA3 areas, neuroinflammation and reduces gliogenesis. The hippocampal neurovascular niche and the total number of microvessels are also changed after radiation exposures. Each or combination of these pathological changes may cause cognitive impairment and aging. Interestingly, acute irradiation of aged brain with a certain amount of radiation has also been reported to induce brain hormesis or neurogenesis. At molecular levels, inflammatory cytokines, chemokines, neural growth factors, neurotransmitters, their receptors and signal transduction systems, reactive oxygen species are involved in radiation-induced adverse effect on brain development and functions. Further study at different omics levels after low dose/dose rate irradiation may not only unravel the mechanisms of radiation-induced adverse brain effect or hormesis, but also provide clues for detection or diagnosis of radiation exposure and for therapeutic approaches to effectively prevent radiation-induced cognitive impairment and aging. Investigation focusing on radiation-induced changes of critical brain development events may reveal many previously unknown adverse effects.
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Affiliation(s)
- Feng Ru Tang
- Singapore Nuclear Research and Safety Initiative, National University of Singapore, Singapore 138602, Singapore.
| | - Weng Keong Loke
- Defence Medical and Environmental Research Institute, DSO National Laboratories, 11 Stockport Road, Singapore 11760, Singapore
| | - Boo Cheong Khoo
- Temasek Laboratories, National University of Singapore, 5A, Engineering Drive 1, Singapore 117411, Singapore
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Cheng Z, Zheng YZ, Li YQ, Wong CS. Cellular Senescence in Mouse Hippocampus After Irradiation and the Role of p53 and p21. J Neuropathol Exp Neurol 2017; 76:260-269. [DOI: 10.1093/jnen/nlx006] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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Dagne BA, Sunay MK, Cayla NS, Ouyang YB, Knox SJ, Giffard RG, Adler JR, Maciver B. High Dose Gamma Radiation Selectively Reduces GABAA-slow Inhibition. Cureus 2017; 9:e1076. [PMID: 28401026 PMCID: PMC5382012 DOI: 10.7759/cureus.1076] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Studies on the effects of gamma radiation on brain tissue have produced markedly differing results, ranging from little effect to major pathology, following irradiation. The present study used control-matched animals to compare effects on a well characterized brain region following gamma irradiation. Male Sprague-Dawley rats were exposed to 60 Gy of whole brain gamma radiation and, after 24-hours, 48-hours, and one-week periods, hippocampal brain slices were isolated and measured for anatomical and physiological differences. There were no major changes observed in tissue appearance or evoked synaptic responses at any post-irradiation time point. However, exposure to 60 Gy of irradiation resulted in a small, but statistically significant (14% change; ANOVA p < 0.005; n = 9) reduction in synaptic inhibition seen at 100 ms, indicating a selective depression of the gamma-aminobutyric acid (GABAA) slow form of inhibition. Population spike (PS) amplitudes also transiently declined by ~ 10% (p < 0.005; n = 9) when comparing the 24-hour group to sham group. Effects on PS amplitude recovered to baseline 48 hour and one week later. There were no obvious negative pathological effects; however, a subtle depression in circuit level inhibition was observed and provides evidence for 'radiomodulation' of brain circuits.
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Affiliation(s)
- Beza A Dagne
- Anesthesia, Stanford University School of Medicine
| | | | | | | | - Susan J Knox
- Department of Radiation Oncology, Stanford University Medical Center
| | | | - John R Adler
- Department of Neurosurgery, Stanford University School of Medicine
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Sirtuin-2 inhibition affects hippocampal functions and sodium butyrate ameliorates the reduction in novel object memory, cell proliferation, and neuroblast differentiation. Lab Anim Res 2016; 32:224-230. [PMID: 28053616 PMCID: PMC5206229 DOI: 10.5625/lar.2016.32.4.224] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 12/03/2016] [Accepted: 12/03/2016] [Indexed: 12/03/2022] Open
Abstract
We investigated the effects of the sirtuin-2 (SIRT2) inhibitor AK-7 on novel object memory, cell proliferation, and neuroblast differentiation in the dentate gyrus. In addition, we also observed the relationships with sodium butyrate, a histone deacetylase inhibitor, on the hippocampal functions. To investigate the effects of AK-7 on hippocampal functions, 10-week-old C57BL/6 mice were daily injected intraperitoneally with 20 mg/kg AK-7 alone or in combination with subcutaneous administration of 300 mg/kg sodium butyrate, a histone deacetylase inhibitor, for 21 days. A novel object recognition test was conducted on days 20 (training) and 21 (testing) of treatment. Thereafter, the animals were sacrificed for immunohistochemistry for Ki67 (cell proliferation) and doublecortin (DCX, neuroblast differentiation). AK-7 administration significantly reduced the time spent exploring new objects, while treatment in combination with sodium butyrate significantly alleviated this reduction. Additionally, AK-7 administration significantly reduced the number of Ki67-positive cells and DCX-immunoreactive neuroblasts in the dentate gyrus, while the treatment in combination with sodium butyrate ameliorated these changes. This result suggests that the reduction of SIRT2 may be closely related to age-related phenotypes including novel object memory, as well as cell proliferation and neuroblast differentiation in the dentate gyrus. In addition, sodium butyrate reverses SIRT2-related age phenotypes.
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45
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Li YQ, Cheng ZC, Liu SW, Aubert I, Wong CS. P53 regulates disruption of neuronal development in the adult hippocampus after irradiation. Cell Death Discov 2016; 2:16072. [PMID: 27752364 PMCID: PMC5045962 DOI: 10.1038/cddiscovery.2016.72] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 08/19/2016] [Indexed: 01/01/2023] Open
Abstract
Inhibition of hippocampal neurogenesis is implicated in neurocognitive dysfunction after cranial irradiation for brain tumors. How irradiation results in impaired neuronal development remains poorly understood. The Trp53 (p53) gene is known to regulate cellular DNA damage response after irradiation. Whether it has a role in disruption of late neuronal development remains unknown. Here we characterized the effects of p53 on neuronal development in adult mouse hippocampus after irradiation. Different bromodeoxyuridine incorporation paradigms and a transplantation study were used for cell fate mapping. Compared with wild-type mice, we observed profound inhibition of hippocampal neurogenesis after irradiation in mice deficient in p53 despite the absence of acute apoptosis of neuroblasts. The putative neural stem cells were apoptosis resistant after irradiation regardless of p53 genotype. Cell fate mapping using different bromodeoxyuridine incorporation paradigms revealed enhanced activation of neural stem cells and their consequential exhaustion in the absence of p53 after irradiation. Both p53-knockout and wild-type mice demonstrated similar extent of microglial activation in the hippocampus after irradiation. Impairment of neuronal differentiation of neural progenitors transplanted in irradiated hippocampus was not altered by p53 genotype of the recipient mice. We conclude that by inhibiting neural progenitor activation, p53 serves to mitigate disruption of neuronal development after irradiation independent of apoptosis and perturbation of the neural stem cell niche. These findings suggest for the first time that p53 may have a key role in late effects in brain after irradiation.
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Affiliation(s)
- Y-Q Li
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre, University of Toronto , Toronto, ON, Canada
| | - Zw-C Cheng
- Institute of Medical Science, University of Toronto , Toronto, ON, Canada
| | - Sk-W Liu
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre, University of Toronto , Toronto, ON, Canada
| | - I Aubert
- Department of Laboratory Medicine and Pathobiology, Sunnybrook Health Sciences Centre, University of Toronto , Toronto, ON, Canada
| | - C S Wong
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre, University of Toronto , Toronto, ON, Canada
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46
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Drobish JK, Gan ZS, Cornfeld AD, Eckenhoff MF. From the Cover: Volatile Anesthetics Transiently Disrupt Neuronal Development in Neonatal Rats. Toxicol Sci 2016; 154:309-319. [PMID: 27562558 DOI: 10.1093/toxsci/kfw164] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Volatile anesthetics can cause neuronal and glial toxicity in the developing mammalian brain, as well as long-term defects in learning and memory. The goals of this study were to compare anesthetics using a clinically relevant exposure paradigm, and to assess the anesthetic effects on hippocampal development and behavior. Our hypothesis was that volatile anesthetics disrupt hippocampal development, causing neurobehavioral defects later in life. Bromodeoxyuridine (BrdU) was administered to rats on postnatal day (P)1, and the rats were exposed to volatile anesthetics (isoflurane, sevoflurane, or desflurane) for 2 h on P2. On days P7 and P14, the BrdU-labeled cells were quantified in the hippocampal dentate gyrus using immunohistochemical assays and fluorescent microscopy. Caspase-3 positive cells were quantified on P2 to evaluate apoptosis. The remaining animals underwent behavioral testing at ages 6 weeks and 6 months, using the Morris Water Maze. Significantly fewer BrdU-positive cells were detected in the hippocampal dentate gyrus in both isoflurane and desflurane-treated animals compared with controls at P7, but there were no changes in cell numbers after sevoflurane exposure. Cell counts for all three anesthetics compared with controls were equivalent at P14. Isoflurane or desflurane exposure yielded slight differences in the behavioral tests at 6 weeks, but no differences at 6 months post-exposure. We conclude that a single 2-h exposure at P2 to either isoflurane or desflurane causes a transient disruption of hippocampal neuronal development with no significant detectable long-term effects on learning and memory, whereas the same exposure to sevoflurane has no effects.
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Affiliation(s)
- Julie K Drobish
- Department of Anesthesiology and Critical Care, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104
| | - Zoe S Gan
- Department of Anesthesiology and Critical Care, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104
| | - Amanda D Cornfeld
- Department of Anesthesiology and Critical Care, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104
| | - Maryellen F Eckenhoff
- Department of Anesthesiology and Critical Care, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104
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Li YQ, Cheng Z, Wong S. Differential Apoptosis Radiosensitivity of Neural Progenitors in Adult Mouse Hippocampus. Int J Mol Sci 2016; 17:ijms17060970. [PMID: 27331809 PMCID: PMC4926502 DOI: 10.3390/ijms17060970] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 06/01/2016] [Accepted: 06/13/2016] [Indexed: 12/22/2022] Open
Abstract
Mammalian tissue-specific stem cells and progenitors demonstrate differential DNA damage response. Neural progenitors in dentate gyrus of the hippocampus are known to undergo apoptosis after irradiation. Using a mouse model of hippocampal neuronal development, we characterized the apoptosis sensitivity of the different neural progenitor subpopulations in adult mouse dentate gyrus after irradiation. Two different bromodeoxyuridine incorporation paradigms were used for cell fate mapping. We identified two apoptosis sensitive neural progenitor subpopulations after irradiation. The first represented non-proliferative and non-newborn neuroblasts and immature neurons that expressed doublecortin, calretinin or both. The second consisted of proliferative intermediate neural progenitors. The putative radial glia-like neural stem cells or type-1 cells, regardless of proliferation status, were apoptosis resistant after irradiation. There was no evidence of radiation-induced apoptosis in the absence of the Trp53 (p53) gene but absence of Cdkn1a (p21) did not alter the apoptotic response. Upregulation of nuclear p53 was observed in neuroblasts after irradiation. We conclude that adult hippocampal neural progenitors may demonstrate differential p53-dependent apoptosis sensitivity after irradiation.
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Affiliation(s)
- Yu-Qing Li
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre, Toronto, ON M4N 3M5, Canada.
| | - Zoey Cheng
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre, Toronto, ON M4N 3M5, Canada.
- Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada.
| | - Shun Wong
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre, Toronto, ON M4N 3M5, Canada.
- Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada.
- Departments of Radiation Oncology and Medical Biophysics, University of Toronto, Toronto, ON M4N 3M5, Canada.
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Verreet T, Rangarajan JR, Quintens R, Verslegers M, Lo AC, Govaerts K, Neefs M, Leysen L, Baatout S, Maes F, Himmelreich U, D'Hooge R, Moons L, Benotmane MA. Persistent Impact of In utero Irradiation on Mouse Brain Structure and Function Characterized by MR Imaging and Behavioral Analysis. Front Behav Neurosci 2016; 10:83. [PMID: 27199692 PMCID: PMC4854899 DOI: 10.3389/fnbeh.2016.00083] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 04/13/2016] [Indexed: 01/29/2023] Open
Abstract
Prenatal irradiation is known to perturb brain development. Epidemiological studies revealed that radiation exposure during weeks 8-15 of pregnancy was associated with an increased occurrence of mental disability and microcephaly. Such neurological deficits were reproduced in animal models, in which rodent behavioral testing is an often used tool to evaluate radiation-induced defective brain functionality. However, up to now, animal studies suggested a threshold dose of around 0.30 Gray (Gy) below which no behavioral alterations can be observed, while human studies hinted at late defects after exposure to doses as low as 0.10 Gy. Here, we acutely irradiated pregnant mice at embryonic day 11 with doses ranging from 0.10 to 1.00 Gy. A thorough investigation of the dose-response relationship of altered brain function and architecture following in utero irradiation was achieved using a behavioral test battery and volumetric 3D T2-weighted magnetic resonance imaging (MRI). We found dose-dependent changes in cage activity, social behavior, anxiety-related exploration, and spatio-cognitive performance. Although behavioral alterations in low-dose exposed animals were mild, we did unveil that both emotionality and higher cognitive abilities were affected in mice exposed to ≥0.10 Gy. Microcephaly was apparent from 0.33 Gy onwards and accompanied by deviations in regional brain volumes as compared to controls. Of note, total brain volume and the relative volume of the ventricles, frontal and posterior cerebral cortex, cerebellum, and striatum were most strongly correlated to altered behavioral parameters. Taken together, we present conclusive evidence for persistent low-dose effects after prenatal irradiation in mice and provide a better understanding of the correlation between their brain size and performance in behavioral tests.
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Affiliation(s)
- Tine Verreet
- Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre (SCK•CEN)Mol, Belgium; Laboratory of Neural Circuit Development and Regeneration, Animal Physiology and Neurobiology Section, Department of Biology, Faculty of Science, Katholieke Universiteit LeuvenLeuven, Belgium
| | - Janaki Raman Rangarajan
- Faculty of Medicine, Molecular Small Animal Imaging Center, Katholieke Universiteit LeuvenLeuven, Belgium; Department of Electrical Engineering (ESAT/PSI), Katholieke Universiteit Leuven and Medical Image Research Center, University Hospital LeuvenLeuven, Belgium
| | - Roel Quintens
- Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre (SCK•CEN) Mol, Belgium
| | - Mieke Verslegers
- Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre (SCK•CEN) Mol, Belgium
| | - Adrian C Lo
- Laboratory of Biological Psychology, Faculty of Psychology and Educational Sciences, Katholieke Universiteit Leuven Leuven, Belgium
| | - Kristof Govaerts
- Biomedical MRI Unit, Department of Imaging and Pathology, Faculty of Medicine, Katholieke Universiteit Leuven Leuven, Belgium
| | - Mieke Neefs
- Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre (SCK•CEN) Mol, Belgium
| | - Liselotte Leysen
- Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre (SCK•CEN) Mol, Belgium
| | - Sarah Baatout
- Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre (SCK•CEN) Mol, Belgium
| | - Frederik Maes
- Department of Electrical Engineering (ESAT/PSI), Katholieke Universiteit Leuven and Medical Image Research Center, University Hospital Leuven Leuven, Belgium
| | - Uwe Himmelreich
- Faculty of Medicine, Molecular Small Animal Imaging Center, Katholieke Universiteit LeuvenLeuven, Belgium; Biomedical MRI Unit, Department of Imaging and Pathology, Faculty of Medicine, Katholieke Universiteit LeuvenLeuven, Belgium
| | - Rudi D'Hooge
- Laboratory of Biological Psychology, Faculty of Psychology and Educational Sciences, Katholieke Universiteit Leuven Leuven, Belgium
| | - Lieve Moons
- Laboratory of Neural Circuit Development and Regeneration, Animal Physiology and Neurobiology Section, Department of Biology, Faculty of Science, Katholieke Universiteit Leuven Leuven, Belgium
| | - Mohammed A Benotmane
- Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre (SCK•CEN) Mol, Belgium
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49
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Effects of Aging on Hippocampal Neurogenesis After Irradiation. Int J Radiat Oncol Biol Phys 2016; 94:1181-9. [DOI: 10.1016/j.ijrobp.2015.12.364] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 12/16/2015] [Accepted: 12/21/2015] [Indexed: 12/11/2022]
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50
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Eriksson P, Buratovic S, Fredriksson A, Stenerlöw B, Sundell-Bergman S. Neonatal exposure to whole body ionizing radiation induces adult neurobehavioural defects: Critical period, dose--response effects and strain and sex comparison. Behav Brain Res 2016; 304:11-9. [PMID: 26876140 DOI: 10.1016/j.bbr.2016.02.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Revised: 02/03/2016] [Accepted: 02/07/2016] [Indexed: 02/06/2023]
Abstract
Development of the brain includes periods which can be critical for its normal maturation. The present study investigates specifically vulnerable peri-/postnatal periods in mice which are essential for understanding the etiology behind radiation induced neurotoxicity and functional defects, including evaluation of neurotoxicity between sexes or commonly used laboratory mouse strains following low/moderate doses of ionizing radiation (IR). Male Naval Medical Research Institute (NMRI) mice, whole body irradiated to a single 500 mGy IR dose, on postnatal day (PND) 3 or PND 10 showed an altered adult spontaneous behaviour and impaired habituation capacity, whereas irradiation on PND 19 did not have any impact on the studied variables. Both NMRI and C57bl/6 male and female mice showed an altered adult spontaneous behaviour and impaired habituation following a single whole body irradiation of 500 or 1000 mGy, but not after 20 or 100 mGy, on PND 10. The present study shows that exposure to low/moderate doses of IR during critical life stages might be involved in the induction of neurological/neurodegenerative disorder/disease. A specifically vulnerable period for radiation induced neurotoxicity seems to be around PND 3-10 in mice. Further studies are needed to investigate mechanisms involved in induction of developmental neurotoxicity following low-dose irradiation.
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Affiliation(s)
- Per Eriksson
- Department of Environmental Toxicology, Uppsala University, Norbyvägen 18A, SE-75236 Uppsala, Sweden.
| | - Sonja Buratovic
- Department of Environmental Toxicology, Uppsala University, Norbyvägen 18A, SE-75236 Uppsala, Sweden
| | - Anders Fredriksson
- Department of Environmental Toxicology, Uppsala University, Norbyvägen 18A, SE-75236 Uppsala, Sweden
| | - Bo Stenerlöw
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Synnöve Sundell-Bergman
- Department of Soil and Environment, Swedish University of Agricultural Sciences, Uppsala, Sweden
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