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Ionizing Radiation-Induced Brain Cell Aging and the Potential Underlying Molecular Mechanisms. Cells 2021; 10:cells10123570. [PMID: 34944078 PMCID: PMC8700624 DOI: 10.3390/cells10123570] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 12/02/2021] [Accepted: 12/16/2021] [Indexed: 01/10/2023] Open
Abstract
Population aging is occurring rapidly worldwide, challenging the global economy and healthcare services. Brain aging is a significant contributor to various age-related neurological and neuropsychological disorders, including Alzheimer's disease and Parkinson's disease. Several extrinsic factors, such as exposure to ionizing radiation, can accelerate senescence. Multiple human and animal studies have reported that exposure to ionizing radiation can have varied effects on organ aging and lead to the prolongation or shortening of life span depending on the radiation dose or dose rate. This paper reviews the effects of radiation on the aging of different types of brain cells, including neurons, microglia, astrocytes, and cerebral endothelial cells. Further, the relevant molecular mechanisms are discussed. Overall, this review highlights how radiation-induced senescence in different cell types may lead to brain aging, which could result in the development of various neurological and neuropsychological disorders. Therefore, treatment targeting radiation-induced oxidative stress and neuroinflammation may prevent radiation-induced brain aging and the neurological and neuropsychological disorders it may cause.
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Yang N, Liu X, Niu X, Wang X, Jiang R, Yuan N, Wang J, Zhang C, Lim KL, Lu L. Activation of Autophagy Ameliorates Age-Related Neurogenesis Decline and Neurodysfunction in Adult Mice. Stem Cell Rev Rep 2021; 18:626-641. [PMID: 34546510 DOI: 10.1007/s12015-021-10265-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/14/2021] [Indexed: 01/10/2023]
Abstract
Adult neurogenesis is the ongoing generation of functional new neurons from neural progenitor cells (NPCs) in the mammalian brain. However, this process declines with aging, which is implicated in the recession of brain function and neurodegeneration. Understanding the mechanism of adult neurogenesis and stimulating neurogenesis will benefit the mitigation of neurodegenerative diseases. Autophagy, a highly conserved process of cellular degradation, is essential for maintaining cellular homeostasis and normal function. Whether and how autophagy affects adult neurogenesis remains poorly understood. In present study, we revealed a close connection between impaired autophagy and adult neurogenetic decline. Expression of autophagy-related genes and autophagic activity were significantly declined in the middle-adult subventricular/subgranular zone (SVZ/SGZ) homogenates and cultured NPCs, and inhibiting autophagy by siRNA interference resulted in impaired proliferation and differentiation of NPCs. Conversely, stimulating autophagy by rapamycin not only revitalized the viability of middle-adult NPCs, but also facilitated the neurogenesis in middle-adult SVZ/SGZ. More importantly, autophagic activation by rapamycin also ameliorated the olfactory sensitivity and cognitional capacities in middle-adult mice. Taken together, our results reveal that compromised autophagy is involved in the decline of adult neurogenesis, which could be reversed by autophagy activation. It also shed light on the regulation of adult neurogenesis and paves the way for developing a therapeutic strategy for aging and neurodegenerative diseases.
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Affiliation(s)
- Na Yang
- Department of Anatomy, Shanxi Medical University, 030001, Taiyuan, People's Republic of China.,Key Laboratory of Cellular Physiology, Ministry of Education, Shanxi Medical University, 030001, Taiyuan, People's Republic of China
| | - Xueqin Liu
- Department of Anatomy, Shanxi Medical University, 030001, Taiyuan, People's Republic of China
| | - Xiaojie Niu
- Department of Anatomy, Shanxi Medical University, 030001, Taiyuan, People's Republic of China
| | - Xiaoqiang Wang
- Department of Anatomy, Shanxi Medical University, 030001, Taiyuan, People's Republic of China
| | - Rong Jiang
- Department of Anatomy, Shanxi Medical University, 030001, Taiyuan, People's Republic of China
| | - Na Yuan
- Hematology Center of Cyrus Tang Medical Institute, Soochow University School of Medicine, 215123, Suzhou, People's Republic of China
| | - Jianrong Wang
- Hematology Center of Cyrus Tang Medical Institute, Soochow University School of Medicine, 215123, Suzhou, People's Republic of China
| | - Chengwu Zhang
- Institute of Advanced Materials, Nanjing Tech University, 211816, Nanjing, People's Republic of China
| | - Kah-Leong Lim
- Lee Kong Chian School of Medicine, Nanyang Technological University, 308232, Singapore, Singapore.
| | - Li Lu
- Department of Anatomy, Shanxi Medical University, 030001, Taiyuan, People's Republic of China. .,Key Laboratory of Cellular Physiology, Ministry of Education, Shanxi Medical University, 030001, Taiyuan, People's Republic of China.
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Vega-Rivera NM, González-Monroy E, Morelos-Santana E, Estrada-Camarena E. The relevance of the endocrine condition in microglia morphology and dendrite complexity of doublecortin-associated neurons in young adult and middle-aged female rats exposed to acute stress. Eur J Neurosci 2021; 54:5293-5309. [PMID: 34302304 DOI: 10.1111/ejn.15398] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 07/19/2021] [Accepted: 07/19/2021] [Indexed: 01/04/2023]
Abstract
Menopause, natural or surgical, might facilitate the onset of psychiatric pathologies. Some reports suggest that their severity could increase if the decline of ovarian hormones occurs abruptly and before natural endocrine senescence. Therefore, we compared the effects of ovariectomy on microglia's morphological alterations, the complexity of newborn neurons, and the animal's ability to cope with stress. Young adult (3 months) and middle-aged (15 months) female Wistar rats were subjected to an ovariectomy (OVX) or were sham-operated. After 3 weeks, animals were assigned to one of the following independent groups: (1) young adult OVX + no stress; (2) young adult sham + no stress; (3) young adult OVX + stress; (4) young adult sham + stress; (5) middle-aged OVX + no stress; (6) middle-aged sham + no stress; (7) middle-aged OVX + stress; (8) middle-aged sham + stress. Acute stress was induced by forced swimming test (FST) exposure. Immobility behavior was scored during FST and 30 min after; animals were euthanized, their brains collected and prepared for immunohistochemical detection of Iba-1 to analyze morphological alterations in microglia, and doublecortin (DCX) detection to evaluate the dendrite complexity of newborn neurons. OVX increased immobility behavior, induced microglia morphological alterations, and reduced dendrite complexity of newborn neurons in young adult rats. FST further increased this effect. In middle-aged rats, the main effects were related to the aging process without OVX or stress exposure. In conclusion, surgical menopause favors in young adult rats, but not in middle-aged, the vulnerability to develop immobility behavior, retracted morphology of microglial cells, and decreased dendrite complexity of newborn neurons.
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Affiliation(s)
- Nelly Maritza Vega-Rivera
- Laboratory of Neuropsychopharmacology, Division of Neurosciences, National Institute of Psychiatry, Mexico City, Mexico
| | - Edgar González-Monroy
- Laboratory of Neuropsychopharmacology, Division of Neurosciences, National Institute of Psychiatry, Mexico City, Mexico
| | - Erik Morelos-Santana
- Division of Clinical Investigations, National Institute of Psychiatry, Mexico City, Mexico
| | - Erika Estrada-Camarena
- Laboratory of Neuropsychopharmacology, Division of Neurosciences, National Institute of Psychiatry, Mexico City, Mexico
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Cuccia F, Rigo M, Gurrera D, Nicosia L, Mazzola R, Figlia V, Giaj-Levra N, Ricchetti F, Attinà G, Pastorello E, De Simone A, Naccarato S, Sicignano G, Ruggieri R, Alongi F. Mitigation on bowel loops daily variations by 1.5-T MR-guided daily-adaptive SBRT for abdomino-pelvic lymph-nodal oligometastases. J Cancer Res Clin Oncol 2021; 147:3269-3277. [PMID: 34268583 DOI: 10.1007/s00432-021-03739-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 06/30/2021] [Indexed: 11/27/2022]
Abstract
PURPOSE We report preliminary dosimetric data concerning the use of 1.5-T MR-guided daily-adaptive radiotherapy for abdomino-pelvic lymph-nodal oligometastases. We aimed to assess the impact of this technology on mitigating daily variations for both target coverage and organs-at-risk (OARs) sparing. METHODS A total of 150 sessions for 30 oligometastases in 23 patients were analyzed. All patients were treated with MR-guided stereotactic body radiotherapy (SBRT) for a total dose of 35 Gy in five fractions. For each fraction, a quantitative analysis was performed for PTV volume, V35Gy and Dmean. Similarly, for OARs, we assessed daily variations of volume, Dmean, Dmax. Any potential statistically significant change between baseline planning and daily-adaptive sessions was assessed using the Wilcoxon signed-rank test, assuming a p value < 0.05 as significant. RESULTS Average baseline PTV, bowel, bladder, and single intestinal loop volumes were respectively 8.9 cc (range 0.7-41.2 cc), 1176 cc (119-3654 cc), 95 cc (39.7-202.9 cc), 18.3 cc (9.1-37.7 cc). No significant volume variations were detected for PTV (p = 0.21) bowel (p = 0.36), bladder (p = 0.47), except for single intestinal loops, which resulted smaller (p = 0.026). Average baseline V35Gy and Dmean for PTV were respectively 85.6% (72-98.8%) and 35.6 Gy (34.6-36.1 Gy). We recorded a slightly positive trend in favor of daily-adaptive strategy vs baseline planning for improved target coverage, although not reaching statistical significance (p = 0.11 and p = 0.18 for PTV-V35Gy and PTV-Dmean). Concerning OARs, a significant difference was observed in favor of daily-adapted treatments in terms of single intestinal loop Dmax [23.05 Gy (13.2-26.9 Gy) at baseline vs 20.5 Gy (12.1-24 Gy); p value = 0.0377] and Dmean [14.4 Gy (6.5-18 Gy) at baseline vs 13.0 Gy (6.7-17.6 Gy); p value = 0.0003]. Specifically for bladder, the average Dmax was 18.6 Gy (0.4-34.3 Gy) at baseline vs 18.3 Gy (0.7-34.3 Gy) for a p value = 0.28; the average Dmean was 7.0 Gy (0.2-16.6 Gy) at baseline vs 6.98 Gy (0.2-16.4 Gy) for a p value = 0.66. Concerning the bowel, no differences in terms of Dmean [4.78 Gy (1.3-10.9 Gy) vs 5.6 Gy (1.4-10.5 Gy); p value = 0.23] were observed between after daily-adapted sessions. A statistically significant difference was observed for bowel Dmax [26.4 Gy (7.7-34 Gy) vs 25.8 Gy (7.8-33.1 Gy); p value = 0.0086]. CONCLUSIONS Daily-adaptive MR-guided SBRT reported a significantly improved single intestinal loop sparing for lymph-nodal oligometastases. Also, bowel Dmax was significantly reduced with daily-adaptive strategy. A minor advantage was also reported in terms of PTV coverage, although not statistically significant.
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Affiliation(s)
- Francesco Cuccia
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Michele Rigo
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Davide Gurrera
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Luca Nicosia
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy.
| | - Rosario Mazzola
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Vanessa Figlia
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Niccolò Giaj-Levra
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Francesco Ricchetti
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Giorgio Attinà
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Edoardo Pastorello
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Antonio De Simone
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Stefania Naccarato
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Gianluisa Sicignano
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Ruggero Ruggieri
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy
| | - Filippo Alongi
- Advanced Radiation Oncology Department, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, VR, Italy.,University of Brescia, Brescia, Italy
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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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Newton J, Brown T, Corley C, Alexander T, Trujillo M, McElroy T, Ntagwabira F, Wang J, Byrum SD, Allen AR. Cranial irradiation impairs juvenile social memory and modulates hippocampal physiology. Brain Res 2020; 1748:147095. [PMID: 32896524 DOI: 10.1016/j.brainres.2020.147095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 07/27/2020] [Accepted: 08/27/2020] [Indexed: 01/20/2023]
Abstract
Cranial and craniospinal irradiation are the oldest central nervous system prophylaxis treatments considered for pediatric patients with acute lymphoblastic leukemia (ALL). However, survivors of childhood ALL that received cranial radiotherapy are at increased risk for deficits in neurocognitive skills. The continuous and dynamic response of normal tissue after irradiation has been identified as one of the causative factors for cognitive changes after cranial radiation therapy. The aim of our study was to investigate the radiation effects on social behavior and neuronal morphology in the hippocampus of adult mice. Twenty-oneday-old male C57BL/6 mice were irradiated with the small-animal radiation research platform (SARRP). Animals were given a single 10-Gy dose of radiation of X-ray cranial radiation. One month following irradiation, animals underwent behavioral testing in the Three-Chamber Sociability paradigm. Radiation affected social discrimination during the third stage eliciting an inability to discriminate between the familiar and stranger mouse, while sham successfully spent more time exploring the novel stranger. Proteomic analysis revealed dysregulation of metabolic and signaling pathways associated with neurocognitive dysfunction such as mitochondrial dysfunction, Rac 1 signaling, and synaptogenesis signaling. We observed significant decreases in mushroom spine density in the Cornu Ammonis 2 of the hippocampus, which is associated with sociability processing.
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Affiliation(s)
- Jamila Newton
- California State University, Stanislaus, Turlock, CA 95382, United States
| | - Taurean Brown
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States; Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States
| | - Christa Corley
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States; Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States
| | - Tyler Alexander
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States; Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States
| | - Madison Trujillo
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States; Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States
| | - Taylor McElroy
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States; Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States
| | - Fabio Ntagwabira
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States; Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States
| | - Jing Wang
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States; Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States
| | - Stephanie D Byrum
- Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States; Arkansas Children's Research Institute, Little Rock, AR 72202, United States
| | - Antiño R Allen
- Division of Radiation Health, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States; Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, AR 72205, United States; Neurobiology & Developmental Sciences, University of Arkansas for Medical Sciences, Little Rock, AR, United States.
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Shi W, Liu W, Ma J, Lu J, Yang X, Wang J, Cao J, Tian Y, Yang H, Zhang L. The role of Atg7-mediated autophagy in ionizing radiation-induced neural stem cell damage. Gene 2020; 738:144485. [PMID: 32087272 DOI: 10.1016/j.gene.2020.144485] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 02/15/2020] [Accepted: 02/18/2020] [Indexed: 02/06/2023]
Abstract
Impairment of neurogenesis is thought to be one of the important mechanisms underlying radiation-induced cognitive decline. Self-renewal and differentiation of neural stem cells (NSCs) are important components of neurogenesis. It has been well established that autophagy plays an important role in neurodegenerative conditions, however, its role in radiation-induced cognitive decline remains unclear. Our previous studies have found that ionizing radiation (IR) induces autophagy in mouse neurons, and minocycline, an antibiotic that can cross the blood-brain barrier, protects neurons from radiation-induced apoptosis through promoting autophagy, thus may contribute to the improvement of mouse cognitive performance after whole-brain irradiation. In the present study, we investigated whether autophagy is involved in radiation-induced damage in self-renewal and differentiation of NSCs. We found that NSCs were extremely sensitive to IR. Irradiation induced autophagy in NSCs in a dose-dependent manner. Atg7 knockdown significantly decreased autophagy, thus increased the apoptosis levels in irradiated NSCs, suggesting that autophagy protected NSCs from radiation-induced apoptosis. Moreover, compared with the negative control NSCs, the neurosphere size was significantly reduced and the neuronal differentiation was notably inhibited in Atg7-deficient NSCs after irradiation, indicating that autophagy defect could exacerbate radiation-induced reduction in NSC self-renewal and differentiation potential. In conclusion, down-regulating autophagy by selective Atg7 knockdown in NSCs enhanced radiation-induced NSC damage, suggesting an important protective role of autophagy in maintaining neurogenesis. Along with the protective effect of autophagy on irradiated neurons, our results on NSCs not only shed the light on the involvement of autophagy in the development of radiation-induced cognitive decline, but also provided a potential target for preventing cognitive impairment after cranial radiation exposure.
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Affiliation(s)
- Wenyu Shi
- Department of Radiotherapy and Oncology, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu Province 215004, PR China; Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu Province 215004, PR China
| | - Wei Liu
- Department of Radiotherapy and Oncology, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu Province 215004, PR China; Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu Province 215004, PR China
| | - Jiayan Ma
- Department of Radiotherapy and Oncology, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu Province 215004, PR China; Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu Province 215004, PR China
| | - Jiawei Lu
- Department of Radiotherapy and Oncology, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu Province 215004, PR China; Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu Province 215004, PR China
| | - Xuejiao Yang
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University/Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, 199 Renai Road, Suzhou Industrial Park, Suzhou, Jiangsu Province 215123, PR China
| | - Jingdong Wang
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University/Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, 199 Renai Road, Suzhou Industrial Park, Suzhou, Jiangsu Province 215123, PR China
| | - Jianping Cao
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University/Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, 199 Renai Road, Suzhou Industrial Park, Suzhou, Jiangsu Province 215123, PR China
| | - Ye Tian
- Department of Radiotherapy and Oncology, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu Province 215004, PR China; Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu Province 215004, PR China; Institute of Radiotherapy & Oncology of Soochow University, PR China
| | - Hongying Yang
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Medical College of Soochow University/Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, 199 Renai Road, Suzhou Industrial Park, Suzhou, Jiangsu Province 215123, PR China; Institute of Radiotherapy & Oncology of Soochow University, PR China.
| | - Liyuan Zhang
- Department of Radiotherapy and Oncology, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu Province 215004, PR China; Jiangsu Key Laboratory of Translational Research and Therapy for Neuro-Psycho-Diseases, Second Affiliated Hospital of Soochow University, 1055 Sanxiang Road, Suzhou, Jiangsu Province 215004, PR China; Institute of Radiotherapy & Oncology of Soochow University, PR China.
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Li YQ, Koritzinsky M, Wong CS. Metabolic Regulation of Hippocampal Neuroprogenitor Apoptosis After Irradiation. J Neuropathol Exp Neurol 2019; 79:325-335. [DOI: 10.1093/jnen/nlz108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 09/23/2019] [Indexed: 12/30/2022] Open
Abstract
Abstract
The tumor suppressor p53 is an important regulator of cell fate response after DNA damage. Cell fate response following metabolic stresses has also been linked to p53-dependent pathways. In this study, we asked if 5′-adenosine monophosphate-activated protein kinase (AMPK), the master sensor of cellular energy balance, played a role in p53-dependent apoptosis of neural progenitor cells (NPCs) in the hippocampus after irradiation. Adult mice with targeted disruption of p53 or prkaa2 (gene that encodes AMPKα) in the brain were used to determine the role of p53 and AMPK, respectively, in radiation-induced apoptosis of NPCs in the hippocampus. The p53-dependent apoptosis of NPCs was associated with an increase in phospho-AMPK expression in the dentate gyrus at 8 hours after irradiation. Activation of AMPK was seen in granule neurons and subgranular NPCs. Compared with wildtype mice, apoptosis of NPCs was significantly attenuated in AMPK deficient (nestinCre: prkaa2fl/fl) mice after irradiation. AMPK deficiency did not however alter p53 activation in NPCs after irradiation. We conclude that AMPK may regulate apoptosis of hippocampal NPCs after irradiation. These findings suggest that cellular metabolism may play a role in determining cell fate response such as apoptosis after DNA damage in NPCs.
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Affiliation(s)
- Yu-Qing Li
- From the Sunnybrook Health Sciences Centre
| | - Marianne Koritzinsky
- University Health Network
- Departments of Radiation Oncology and Medical Biophysics, University of Toronto (MK, CSW), Toronto, Ontario, Canada
| | - C Shun Wong
- From the Sunnybrook Health Sciences Centre
- Departments of Radiation Oncology and Medical Biophysics, University of Toronto (MK, CSW), Toronto, Ontario, Canada
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9
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Cucinotta FA, Cacao E. Risks of cognitive detriments after low dose heavy ion and proton exposures. Int J Radiat Biol 2019; 95:985-998. [PMID: 31120359 PMCID: PMC6606350 DOI: 10.1080/09553002.2019.1623427] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 04/16/2019] [Accepted: 04/25/2019] [Indexed: 12/15/2022]
Abstract
Purpose: Heavy ion and proton brain irradiations occur during space travel and in Hadron therapy for cancer. Heavy ions produce distinct patterns of energy deposition in neuron cells and brain tissues compared to X-rays leading to large uncertainties in risk estimates. We make a critical review of findings from research studies over the last 25 years for understanding risks at low dose. Conclusions: A large number of mouse and rat cognitive testing measures have been reported for a variety of particle species and energies for acute doses. However, tissue reactions occur above dose thresholds and very few studies were performed at the heavy ion doses to be encountered on space missions (<0.04 Gy/y) or considered dose-rate effects, such that threshold doses are not known in rodent models. Investigations of possible mechanisms for cognitive changes have been limited by experimental design with largely group specific and not subject specific findings reported. Persistent oxidative stress and activated microglia cells are common mechanisms studied, while impairment of neurogenesis, detriments in neuron morphology, and changes to gene and protein expression were each found to be important in specific studies. Future research should focus on estimating threshold doses carried out with experimental designs aimed at understating causative mechanisms, which will be essential for extrapolating rodent findings to humans and chronic radiation scenarios, while establishing if mitigation are needed.
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Stoker J, Vora S, Patel A, Grosshans D, Brown PD, Vern-Gross T, Bues M, Daniels T, Allred B, Uejo A, Kosiorek H, Bruso M, Keole S. Advantages of intensity modulated proton therapy during hippocampal avoidance whole brain radiation therapy. PHYSICS & IMAGING IN RADIATION ONCOLOGY 2018; 8:28-32. [PMID: 33458413 PMCID: PMC7807533 DOI: 10.1016/j.phro.2018.11.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 10/31/2018] [Accepted: 11/02/2018] [Indexed: 02/07/2023]
Abstract
Whole-brain intensity modulated proton therapy capably spares hippocampal volumes. Hippocampal avoidance whole-brain radiotherapy may benefit pediatric populations. Intensity modulated proton therapy provides superior target-dose homogeneity relative to modulated x-rays.
Background and purpose Intensity modulated proton therapy (IMPT) allows for modulation parameterized for individual beamlets by position, intensity, and depth. This modulation capability is ideally suited for sparing organs at risk intermediate of the radiation target, such as hippocampal volumes within the whole brain. This work compared IMPT relative to volumetric modulated arc therapy (VMAT) during hippocampal avoidance whole brain radiation therapy (HA WBRT). Materials and methods Ten adult and ten pediatric patients previously treated for central nervous system malignancies were identified. IMPT and VMAT treatment plans employing HA WBRT were generated for each patient, delivering 30 GyE (Gray Equivalent) in 10 fractions for adults and 36 GyE in 20 fractions for pediatrics. Dose indices, including dose volume histogram metrics and homogeneity index HI = [D5% − D95%]/[Dmean] × 100, were used to assess plan quality and describe target coverage and normal-tissue sparing. Results IMPT offered significant benefits relative to VMAT for hippocampal sparing. Hippocampal mean dose was reduced from 13.7 ± 0.8 Gy with VMAT to 5.4 ± 0.3 GyE using IMPT for pediatrics, and was reduced from 11.7 ± 0.9 Gy with VMAT to 4.4 ± 0.2 GyE using IMPT for adults. IMPT similarly lowered left hippocampal mean dose. Dose to 95% of the clinical target volume was statistically equivalent for both groups; however IMPT reduced the homogeneity index by roughly half. Conclusion This manuscript demonstrates that HA IMPT can match or exceed dosimetric benefits offered with modulated X-rays. Inclusion of IMPT in future prospective studies is warranted.
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Affiliation(s)
- Joshua Stoker
- Department of Radiation Oncology, Mayo Clinic Arizona, Phoenix, AZ, USA
- Corresponding author at: Mayo Clinic Arizona, 5777 E. Mayo Blvd, Phoenix, AZ 85054, USA.
| | - Sujay Vora
- Department of Radiation Oncology, Mayo Clinic Arizona, Phoenix, AZ, USA
| | - Ameet Patel
- Department of Radiology, Division of Neuroradiology, Mayo Clinic Arizona, Phoenix, AZ, USA
| | - David Grosshans
- Division of Radiation Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, TX, USA
| | - Paul D. Brown
- Department of Radiation Oncology, Mayo Clinic Rochester, Rochester, MN, USA
| | - Tamara Vern-Gross
- Department of Radiation Oncology, Mayo Clinic Arizona, Phoenix, AZ, USA
| | - Martin Bues
- Department of Radiation Oncology, Mayo Clinic Arizona, Phoenix, AZ, USA
| | - Thomas Daniels
- Department of Radiation Oncology, Mayo Clinic Arizona, Phoenix, AZ, USA
| | - Bryce Allred
- Department of Radiation Oncology, Mayo Clinic Arizona, Phoenix, AZ, USA
| | - Arielle Uejo
- Department of Radiation Oncology, Mayo Clinic Arizona, Phoenix, AZ, USA
| | - Heidi Kosiorek
- Department of Research Biostatistics, Mayo Clinic Arizona, Phoenix, AZ, USA
| | - Marlene Bruso
- Department of Research Biostatistics, Mayo Clinic Arizona, Phoenix, AZ, USA
| | - Sameer Keole
- Department of Radiation Oncology, Mayo Clinic Arizona, Phoenix, AZ, USA
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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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Ji S, Ding X, Ji J, Wu H, Sun R, Li X, Zhang L, Tian Y. Cranial irradiation inhibits hippocampal neurogenesis via DNMT1 and DNMT3A. Oncol Lett 2018; 15:2899-2904. [PMID: 29435016 PMCID: PMC5778827 DOI: 10.3892/ol.2017.7643] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Accepted: 11/16/2017] [Indexed: 02/07/2023] Open
Abstract
Impairment of neurogenesis in the hippocampus following whole-brain irradiation is the most important mechanism of radiation-induced cognitive dysfunction. However, the underlying mechanism remains obscure, meaning an ideal therapeutic target has not been identified. Evidence indicates that DNA methylation in neurons regulates synaptic plasticity and neuronal network activity. In the present study, the expression of DNA methyltransferases (DNMTs) in the hippocampus was analyzed to investigate their potential function in radiation-induced neurogenesis impairment. Sprague-Dawley rats were used throughout the present study, apportioned to the following groups: Control, radiation only, zebularine (a DNMT inhibitor) only, and radiation and zebularine together. Immunofluorescence staining revealed that radiation inhibited cellular proliferation and dendritic growth within new neurons of the hippocampus. In addition, western blot analysis demonstrated lower expression levels of DNMT1 and DNMT3A protein following radiation treatment compared with that in the non-irradiated control. Furthermore, compared with the radiation-only group, the radiation and zebularine group had significantly lower cell proliferative abilities, dendritic growth, and DNMT1 and DNMT3A protein levels. The results of the present study indicated that DNMT1 and DNMT3A may be involved in the pathogenesis of whole-brain radiation-induced neurogenesis impairment.
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Affiliation(s)
- Shengjun Ji
- Cancer Center, Nanjing Medical University Affiliated Suzhou Hospital, Suzhou, Jiangsu 215001, P.R. China
| | - Xin Ding
- Department of Radiotherapy and Oncology, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, P.R. China
| | - Jiang Ji
- Department of Radiotherapy and Oncology, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, P.R. China
| | - Haohao Wu
- Department of Radiotherapy and Oncology, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, P.R. China
| | - Rui Sun
- Department of Radiotherapy and Oncology, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, P.R. China
| | - Xiaoyang Li
- Department of Radiotherapy and Oncology, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, P.R. China
| | - Liyuan Zhang
- Department of Radiotherapy and Oncology, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, P.R. China
| | - Ye Tian
- Department of Radiotherapy and Oncology, The Second Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215004, P.R. China
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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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Long-term brain structural magnetic resonance imaging and cognitive functioning in children treated for acute lymphoblastic leukemia with high-dose methotrexate chemotherapy alone or combined with CNS radiotherapy at reduced total dose to 12 Gy. Neuroradiology 2017; 59:147-156. [PMID: 28074235 PMCID: PMC5371615 DOI: 10.1007/s00234-016-1777-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 12/14/2016] [Indexed: 10/24/2022]
Abstract
INTRODUCTION The aim of this study was to assess the long-term side effects of central nervous system prophylaxis (high-dose chemotherapy alone vs chemotherapy and CNS radiotherapy) according to the ALL IC-BFM 2002. METHODS Thirty-tree children aged 6.7-19.9 years have been studied. The control group consisted of 12 children newly diagnosed with acute lymphoblastic leukemia. We assessed subcortical gray matter volume using automatic MRI segmentation and cognitive performance to identify differences between two therapeutic schemes and patients prior to treatment. RESULTS Patients treated with chemotherapy and CNS radiotherapy had smaller hippocampi than two other subgroups and lower IQ score than patients treated with chemotherapy alone. Both treated groups, whether with chemotherapy only or in combination with CNS radiotherapy, had significantly lower volumes of caudate nucleus and performed significantly worse on measures of verbal fluency in comparison with patients prior to treatment. There were no differences in the mean volumes of total white matter, total gray matter, thalamus, putamen, and amygdala between the studied groups. CONCLUSION In all children treated according to the ALL IC-BFM 2002 with high-dose chemotherapy, both decreased volume of selected subcortical structures and cognitive impairment was observed, especially in children who received chemotherapy in combination with reduced dose CNS radiotherapy. In all children treated according to the ALL IC-BFM 2002 with high-dose chemotherapy, both decreased volume of selected subcortical structures and cognitive impairment were observed, especially in children who received chemotherapy in combination with CNS radiotherapy.
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