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https://www.readbyqxmd.com/read/28587054/later-life-changes-in-hippocampal-neurogenesis-and-behavioral-functions-after-low-dose-prenatal-irradiation-at-early-organogenesis-stage
#1
Ramya Ganapathi, Kailash Manda
PURPOSE: To investigate long-term changes in behavioral functions of mice after exposure to low-dose prenatal radiation at an early organogenesis stage. METHODS AND MATERIALS: Pregnant C57BL/6J mice were irradiated (20 cGy) at postcoitus day 5.5. The male and female offspring were subjected to different behavioral assays for affective, motor, and cognitive functions at 3, 6, and 12 months of age. Behavioral functions were further correlated with the population of CA1 and CA3 pyramidal neurons and immature neurons in hippocampal dentate gyrus...
May 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28529513/ionizing-radiation-induced-immune-and-inflammatory-reactions-in-the-brain
#2
REVIEW
Katalin Lumniczky, Tünde Szatmári, Géza Sáfrány
Radiation-induced late brain injury consisting of vascular abnormalities, demyelination, white matter necrosis, and cognitive impairment has been described in patients subjected to cranial radiotherapy for brain tumors. Accumulating evidence suggests that various degrees of cognitive deficit can develop after much lower doses of ionizing radiation, as well. The pathophysiological mechanisms underlying these alterations are not elucidated so far. A permanent deficit in neurogenesis, chronic microvascular alterations, and blood-brain barrier dysfunctionality are considered among the main causative factors...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28454069/cns-bioavailability-and-radiation-protection-of-normal-hippocampal-neurogenesis-by-a-lipophilic-mn-porphyrin-based-superoxide-dismutase-mimic-mntnbuoe-2-pyp-5
#3
David Leu, Ivan Spasojevic, Huy Nguyen, Brian Deng, Artak Tovmasyan, Tin Weitner, Romulo S Sampaio, Ines Batinic-Haberle, Ting-Ting Huang
Although radiation therapy can be effective against cancer, potential damage to normal tissues limits the amount that can be safely administered. In central nervous system (CNS), radiation damage to normal tissues is presented, in part, as suppressed hippocampal neurogenesis and impaired cognitive functions. Mn porphyrin (MnP)-based redox active drugs have demonstrated differential effects on cancer and normal tissues in experimental animals that lead to protection of normal tissues and radio- and chemo-sensitization of cancers...
August 2017: Redox Biology
https://www.readbyqxmd.com/read/28415806/lithium-protects-hippocampal-progenitors-cognitive-performance-and-hypothalamus-pituitary-function-after-irradiation-to-the-juvenile-rat-brain
#4
Kai Zhou, Cuicui Xie, Malin Wickström, Amalia M Dolga, Yaodong Zhang, Tao Li, Yiran Xu, Carsten Culmsee, Per Kogner, Changlian Zhu, Klas Blomgren
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...
May 23, 2017: Oncotarget
https://www.readbyqxmd.com/read/28380447/the-p75-neurotrophin-receptor-regulates-cranial-irradiation-induced-hippocampus-dependent-cognitive-dysfunction
#5
Xin Ding, Hao-Hao Wu, Sheng-Jun Ji, Shang Cai, Pei-Wen Dai, Mei-Ling Xu, Jun-Jun Zhang, Qi-Xian Zhang, Ye Tian, Quan-Hong Ma
Cognitive deficits, characterized by progressive problems with hippocampus-dependent learning, memory and spatial processing, are the most serious complication of cranial irradiation. However, the underlying mechanisms remain obscure. The p75 neurotrophin receptor (p75NTR) is involved in a diverse arrays of cellular responses, including neurite outgrowth, neurogenesis, and negative regulation of spine density, which are associated with various neurological disorders. In this study, male Sprague-Dawley (SD) rats received 10 Gy cranial irradiation...
June 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/28375680/electroacupuncture-improves-cognitive-function-and-hippocampal-neurogenesis-after-brain-irradiation
#6
Xing-Wen Fan, Huan-Huan Liu, Hong-Bing Wang, Fu Chen, Yu Yang, Yan Chen, Shi-Kuo Guan, Kai-Liang Wu
Cognitive impairments after brain irradiation seriously affect quality of life for patients, and there is currently no effective treatment. In this study using an irradiated rat model, the role of electroacupuncture was investigated for treatment of radiation-induced brain injury. Animals received 10 Gy exposure to the entire brain, and electroacupuncture was administered 3 days before irradiation as well as up to 2 weeks postirradiation. Behavioral tests were performed one month postirradiation, and rats were then sacrificed for histology or molecular studies...
June 2017: Radiation Research
https://www.readbyqxmd.com/read/27925861/modeling-heavy-ion-impairment-of-hippocampal-neurogenesis-after-acute-and-fractionated-irradiation
#7
Eliedonna Cacao, Francis A Cucinotta
Radiation-induced impairment of neurogenesis in the hippocampal dentate gyrus is a concern due to its reported association with cognitive detriments after radiotherapy for brain cancers and the possible risks to astronauts chronically exposed to space radiation. Here, we have extended our recent work in a mouse model of impaired neurogenesis after exposure to low-linear energy transfer (LET) radiation to heavy ion irradiation. To our knowledge, this is the first report of a predictive mathematical model of radiation-induced changes to neurogenesis for a variety of radiation types after acute or fractionated irradiation...
December 2016: Radiation Research
https://www.readbyqxmd.com/read/27919332/effects-of-ionizing-radiation-on-the-mammalian-brain
#8
REVIEW
Daniela Hladik, Soile Tapio
Epidemiological studies on the atomic-bomb survivors, cancer survivors and occupational cohorts provide strong evidence for multifaceted damage to brain after ionizing radiation. Radiation-induced late effects may manifest as brain tumors or cognitive impairment. Decreased neurogenesis and differentiation, alteration in neural structure and synaptic plasticity as well as increased oxidative stress and inflammation are suggested to contribute to adverse effects in the brain. In addition to neural stems cells, several brain-specific mature cell types including endothelial and glial cells are negatively affected by ionizing radiation...
October 2016: Mutation Research
https://www.readbyqxmd.com/read/27876394/postnatal-irradiation-induced-hippocampal-neuropathology-cognitive-impairment-and-aging
#9
REVIEW
Feng Ru Tang, Weng Keong Loke, Boo Cheong Khoo
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...
April 2017: Brain & Development
https://www.readbyqxmd.com/read/27132524/radiation-induced-brain-injury-low-hanging-fruit-for-neuroregeneration
#10
Terry C Burns, Ahmed J Awad, Matthew D Li, Gerald A Grant
Brain radiation is a fundamental tool in neurooncology to improve local tumor control, but it leads to profound and progressive impairments in cognitive function. Increased attention to quality of life in neurooncology has accelerated efforts to understand and ameliorate radiation-induced cognitive sequelae. Such progress has coincided with a new understanding of the role of CNS progenitor cell populations in normal cognition and in their potential utility for the treatment of neurological diseases. The irradiated brain exhibits a host of biochemical and cellular derangements, including loss of endogenous neurogenesis, demyelination, and ablation of endogenous oligodendrocyte progenitor cells...
May 2016: Neurosurgical Focus
https://www.readbyqxmd.com/read/27087553/a-link-between-vascular-damage-and-cognitive-deficits-after-whole-brain-radiation-therapy-for-cancer-a-clue-to-other-types-of-dementia
#11
REVIEW
Maki K Yamada
Whole brain radiation therapy for the treatment of tumors can sometimes cause cognitive impairment. Memory deficits were noted in up to 50% of treated patients over a short period of several months. In addition, an increased rate of dementia in young patients has been noted over the longer term, i.e. years. A deficit in neurogenesis after irradiation has been postulated to be the main cause of cognitive decline in patients, but recent data on irradiation therapy for limited parts of the brain appear to indicate other possibilities...
2016: Drug Discoveries & Therapeutics
https://www.readbyqxmd.com/read/27057631/age-related-effects-of-x-ray-irradiation-on-mouse-hippocampus
#12
Arianna Casciati, Katalin Dobos, Francesca Antonelli, Anett Benedek, Stefan J Kempf, Montserrat Bellés, Andrea Balogh, Mirella Tanori, Luis Heredia, Michael J Atkinson, Christine von Toerne, Omid Azimzadeh, Anna Saran, Geza Sáfrány, Mohammed A Benotmane, M Victoria Linares-Vidal, Soile Tapio, Katalin Lumniczky, Simonetta Pazzaglia
Therapeutic irradiation of pediatric and adult patients can profoundly affect adult neurogenesis, and cognitive impairment manifests as a deficit in hippocampal-dependent functions. Age plays a major role in susceptibility to radiation, and younger children are at higher risk of cognitive decay when compared to adults. Cranial irradiation affects hippocampal neurogenesis by induction of DNA damage in neural progenitors, through the disruption of the neurogenic microenvironment, and defective integration of newborn neurons into the neuronal network...
May 10, 2016: Oncotarget
https://www.readbyqxmd.com/read/27023259/x-irradiation-induces-acute-cognitive-decline-via-transient-synaptic-dysfunction
#13
Anggraeini Puspitasari, Noriko Koganezawa, Yuta Ishizuka, Nobuhiko Kojima, Natsume Tanaka, Takashi Nakano, Tomoaki Shirao
Cranial X irradiation can severely impair higher brain function, resulting in neurocognitive deficits. Radiation-induced brain injury is characterized by acute, early and late delayed changes, and morbidity is evident more than 6 months after irradiation. While the acute effects of radiation exposure on the brain are known, the underlying mechanisms remain unclear. In this study, we examined the acute effect of X radiation on synaptic function using behavioral analysis and immunohistochemistry. We found that 10 Gy whole-brain irradiation immediately after conditioning (within 30 min) impaired the formation of fear memory, whereas irradiation 24 h prior to conditioning did not...
2016: Radiation Research
https://www.readbyqxmd.com/read/26996825/contrasting-the-effects-of-proton-irradiation-on-dendritic-complexity-of-subiculum-neurons-in-wild-type-and-mcat-mice
#14
Nicole N Chmielewski, Chongshan Caressi, Erich Giedzinski, Vipan K Parihar, Charles L Limoli
Growing evidence suggests that radiation-induced oxidative stress directly affects a wide range of biological changes with an overall negative impact on CNS function. In the past we have demonstrated that transgenic mice over-expressing human catalase targeted to the mitochondria (MCAT) exhibit a range of neuroprotective phenotypes following irradiation that include improved neurogenesis, dendritic complexity, and cognition. To determine the extent of the neuroprotective phenotype afforded by MCAT expression in different hippocampal regions, we analyzed subiculum neurons for changes in neuronal structure and synaptic integrity after exposure to low dose (0...
June 2016: Environmental and Molecular Mutagenesis
https://www.readbyqxmd.com/read/26946222/cognitive-impairments-following-cranial-irradiation-can-be-mitigated-by-treatment-with-a-tropomyosin-receptor-kinase-b-agonist
#15
Phillip Yang, David Leu, Keqiang Ye, Chandra Srinivasan, John R Fike, Ting-Ting Huang
Brain radiotherapy is frequently used successfully to treat brain tumors. However, radiotherapy is often associated with declines in short-term and long-term memory, learning ability, and verbal fluency. We previously identified a downregulation of the brain-derived neurotrophic factor (BDNF) following cranial irradiation in experimental animals. In the present study, we investigated whether targeting the BDNF high affinity receptor, tropomysin receptor kinase B (TrkB), could mitigate radiation-induced cognitive deficits...
May 2016: Experimental Neurology
https://www.readbyqxmd.com/read/26943452/modeling-impaired-hippocampal-neurogenesis-after-radiation-exposure
#16
Eliedonna Cacao, Francis A Cucinotta
Radiation impairment of neurogenesis in the hippocampal dentate gyrus is one of several factors associated with cognitive detriments after treatment of brain cancers in children and adults with radiation therapy. Mouse models have been used to study radiation-induced changes in neurogenesis, however the models are limited in the number of doses, dose fractions, age and time after exposure conditions that have been studied. The purpose of this study is to develop a novel predictive mathematical model of radiation-induced changes to neurogenesis using a system of nonlinear ordinary differential equations (ODEs) to represent the time, age and dose-dependent changes to several cell populations participating in neurogenesis as reported in mouse experiments exposed to low-LET radiation...
March 2016: Radiation Research
https://www.readbyqxmd.com/read/26610477/molecular-cellular-and-functional-effects-of-radiation-induced-brain-injury-a-review
#17
REVIEW
Sona Balentova, Marian Adamkov
Radiation therapy is the most effective non-surgical treatment of primary brain tumors and metastases. Preclinical studies have provided valuable insights into pathogenesis of radiation-induced injury to the central nervous system. Radiation-induced brain injury can damage neuronal, glial and vascular compartments of the brain and may lead to molecular, cellular and functional changes. Given its central role in memory and adult neurogenesis, the majority of studies have focused on the hippocampus. These findings suggested that hippocampal avoidance in cranial radiotherapy prevents radiation-induced cognitive impairment of patients...
2015: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/26086545/chemotherapy-cognitive-impairment-and-hippocampal-toxicity
#18
REVIEW
J Dietrich, M Prust, J Kaiser
Cancer therapies can be associated with significant central nervous system (CNS) toxicity. While radiation-induced brain damage has been long recognized both in pediatric and adult cancer patients, CNS toxicity from chemotherapy has only recently been acknowledged. Clinical studies suggest that the most frequent neurotoxic adverse effects associated with chemotherapy include memory and learning deficits, alterations of attention, concentration, processing speed and executive function. Preclinical studies have started to shed light on how chemotherapy targets the CNS both on cellular and molecular levels to disrupt neural function and brain plasticity...
November 19, 2015: Neuroscience
https://www.readbyqxmd.com/read/25797440/oxidative-stress-and-redox-regulation-on-hippocampal-dependent-cognitive-functions
#19
REVIEW
Ting-Ting Huang, David Leu, Yani Zou
Hippocampal-dependent cognitive functions rely on production of new neurons and maintenance of dendritic structures to provide the synaptic plasticity needed for learning and formation of new memories. Hippocampal formation is exquisitely sensitive to patho-physiological changes, and reduced antioxidant capacity and exposure to low dose irradiation can significantly impede hippocampal-dependent functions of learning and memory by reducing the production of new neurons and alter dendritic structures in the hippocampus...
June 15, 2015: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/25792232/cranial-irradiation-regulates-creb-bdnf-signaling-and-variant-bdnf-transcript-levels-in-the-mouse-hippocampus
#20
Yeonghoon Son, Miyoung Yang, Sohi Kang, Sueun Lee, Jinwook Kim, Juhwan Kim, Seri Park, Joong-Sun Kim, Sung-Kee Jo, Uhee Jung, Taekyun Shin, Sung-Ho Kim, Hongbing Wang, Changjong Moon
The brain can be exposed to ionizing radiation in various ways, and such irradiation can trigger adverse effects, particularly on learning and memory. However, the precise mechanisms of cognitive impairments induced by cranial irradiation remain unknown. In the hippocampus, brain-derived neurotrophic factor (BDNF) plays roles in neurogenesis, neuronal survival, neuronal differentiation, and synaptic plasticity. The significance of BDNF transcript variants in these contexts is becoming clearer. In the present study, both object recognition memory and contextual fear conditioning task performance in adult C57BL/6 mice were assessed 1 month after a single exposure to cranial irradiation (10 Gy) to evaluate hippocampus-related behavioral dysfunction following such irradiation...
May 2015: Neurobiology of Learning and Memory
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