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Perry G. The dingo debate: origins, behaviour and conservation. Edited by Bradley Smith. CSIRO Publishing, 2015. 336 pages. A$39.95. ISBN 9781486300297. Aust Vet J 2016. [DOI: 10.1111/avj.12453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Dadiani M, Bossel Ben-Moshe N, Paluch-Shimon S, Perry G, Balint N, Marin I, Pavlovski A, Morzaev D, Kahana-Edwin S, Yosepovich A, Gal-Yam EN, Berger R, Barshack I, Domany E, Kaufman B. Tumor Evolution Inferred by Patterns of microRNA Expression through the Course of Disease, Therapy, and Recurrence in Breast Cancer. Clin Cancer Res 2016; 22:3651-62. [PMID: 26957561 DOI: 10.1158/1078-0432.ccr-15-2313] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 02/21/2016] [Indexed: 11/16/2022]
Abstract
PURPOSE Molecular evolution of tumors during progression, therapy, and metastasis is a major clinical challenge and the main reason for resistance to therapy. We hypothesized that microRNAs (miRNAs) that exhibit similar variation of expression through the course of disease in several patients have a significant function in the tumorigenic process. EXPERIMENTAL DESIGN Exploration of evolving disease by profiling 800 miRNA expression from serial samples of individual breast cancer patients at several time points: pretreatment, posttreatment, lymph nodes, and recurrence sites when available (58 unique samples from 19 patients). Using a dynamic approach for analysis, we identified expression modulation patterns and classified varying miRNAs into one of the eight possible temporal expression patterns. RESULTS The various patterns were found to be associated with different tumorigenic pathways. The dominant pattern identified an miRNA set that significantly differentiated between disease stages, and its pattern in each patient was also associated with response to therapy. These miRNAs were related to tumor proliferation and to the cell-cycle pathway, and their mRNA targets showed anticorrelated expression. Interestingly, the level of these miRNAs was lowest in matched recurrent samples from distant metastasis, indicating a gradual increase in proliferative potential through the course of disease. Finally, the average expression level of these miRNAs in the pretreatment biopsy was significantly different comparing patients experiencing recurrence to recurrence-free patients. CONCLUSIONS Serial tumor sampling combined with analysis of temporal expression patterns enabled to pinpoint significant signatures characterizing breast cancer progression, associated with response to therapy and with risk of recurrence. Clin Cancer Res; 22(14); 3651-62. ©2016 AACR.
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Tsarouchas N, Perry G, Singh K, Hamandi K. ID 431 – A novel method for the diagnosis of photosensitive epilepsy based on the phase-locking of evoked gamma-band magnetoencephalographic oscillatory brain responses. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2015.11.433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Mondragón-Rodríguez S, Perry G, Luna-Muñoz J, Acevedo-Aquino MC, Williams S. Phosphorylation of tau protein at sites Ser(396-404) is one of the earliest events in Alzheimer's disease and Down syndrome. Neuropathol Appl Neurobiol 2014; 40:121-35. [PMID: 24033439 DOI: 10.1111/nan.12084] [Citation(s) in RCA: 184] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Revised: 08/21/2013] [Accepted: 08/23/2013] [Indexed: 01/11/2023]
Abstract
AIMS Phosphorylation, conformational changes and cleavage of tau protein have been widely suggested to contribute to abnormal tau processing in the pathogenesis of Alzheimer's disease, as well as in other tauopathies. Consistently, many phosphorylated sites, such as Ser(199-202) -Thr(205) and Ser(396-404) , have been associated with this pathological processing. The present study examined the chronological appearance of phosphorylation during the neurofibrillary tangle (NFT) evolution in Alzheimer disease (AD) and Down syndrome. METHODS Immunohistochemistry for modified tau [phosphorylated at Ser(199-202) -Thr(205) (AT8) and Ser(396-404) (PHF-1) or truncated at D(421) (TauC3) and E(391) (MN423)] was performed on paraffin-embedded human brain sections. Double immunofluorescence for phosphorylated and truncated tau was used to detect intensity and distribution of tau immunoreactivity, and provided detailed characterization of NFT pathology. RESULTS Phosphorylation at sites Ser(396-404) was significantly increased when compared with phosphorylations at sites Ser(199-202) -Thr(205) . Around 50% of the total structures containing phosphorylation at sites Ser(396-404) were found as early phospho-tau aggregates with a well-preserved neuronal soma. Phosphorylation of tau protein at sites Ser(396) coexists with early and late truncation events. Tau abnormal processing in Down syndrome consistently showed similar alterations as observed in AD. CONCLUSION Phosphorylation of tau protein at the carboxyl terminus may be among the earliest tau events, and it occurs prior to the apparition of the classical fibrillar structure. Finally, these data validate PHF-1 as an efficient marker for AD cytopathology following the progression of tau aggregation into NFT.
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Caspi M, Perry G, Skalka N, Meisel S, Firsow A, Amit M, Rosin-Arbesfeld R. Aldolase positively regulates of the canonical Wnt signaling pathway. Mol Cancer 2014; 13:164. [PMID: 24993527 PMCID: PMC4094682 DOI: 10.1186/1476-4598-13-164] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Accepted: 06/20/2014] [Indexed: 11/10/2022] Open
Abstract
The Wnt signaling pathway is an evolutionary conserved system, having pivotal roles during animal development. When over-activated, this signaling pathway is involved in cancer initiation and progression. The canonical Wnt pathway regulates the stability of β-catenin primarily by a destruction complex containing a number of different proteins, including Glycogen synthase kinase 3β (GSK-3β) and Axin, that promote proteasomal degradation of β-catenin. As this signaling cascade is modified by various proteins, novel screens aimed at identifying new Wnt signaling regulators were conducted in our laboratory. One of the different genes that were identified as Wnt signaling activators was Aldolase C (ALDOC). Here we report that ALDOC, Aldolase A (ALDOA) and Aldolase B (ALDOB) activate Wnt signaling in a GSK-3β-dependent mechanism, by disrupting the GSK-3β-Axin interaction and targeting Axin to the dishevelled (Dvl)-induced signalosomes that positively regulate the Wnt pathway thus placing the Aldolase proteins as novel Wnt signaling regulators.
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Schrag M, Mueller C, Zabel M, Crofton A, Kirsch W, Ghribi O, Squitti R, Perry G. Oxidative stress in blood in Alzheimer's disease and mild cognitive impairment: A meta-analysis. Neurobiol Dis 2013; 59:100-10. [DOI: 10.1016/j.nbd.2013.07.005] [Citation(s) in RCA: 211] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Revised: 06/02/2013] [Accepted: 07/04/2013] [Indexed: 12/26/2022] Open
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Perry EA, Castellani RJ, Moreira PI, Nunomura A, Lui Q, Harris PLR, Sayre LM, Szweda PA, Szweda LI, Zhu X, Smith MA, Perry G. Neurofilaments are the major neuronal target of hydroxynonenal-mediated protein cross-links. Free Radic Res 2013; 47:507-10. [PMID: 23566300 DOI: 10.3109/10715762.2013.794265] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Lipid peroxidation generates reactive aldehydes, most notably hydroxynonenal (HNE), which covalently binds amino acid residue side chains leading to protein inactivation and insolubility. Specific adducts of lipid peroxidation have been demonstrated to be intimately associated with pathological lesions of Alzheimer's disease (AD), suggesting that oxidative stress is a major component in the disease. Here, we examined the HNE-cross-linking modifications by using an antibody specific for a lysine-lysine cross-link. Since in a prior study we noted no immunolabeling of neuritic plaques or neurofibrillary tangles but instead found strong labeling of axons, we focused this study on axons. Axonal labeling was examined in mouse sciatic nerve, and immunoblotting showed the cross-link was restricted to neurofilament heavy and medium subunits, which while altering migration, did not indicate larger NF aggregates, indicative of intermolecular cross-links. Examination of mice at various ages showed the extent of modification remaining relatively constant through the life span. These findings demonstrate lipid-cross-linking peroxidation primarily involves lysine-rich neurofilaments and is restricted to intramolecular cross-links.
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Malone S, Eapen L, C. E, Kendal W, MacRae R, D'Amico A, Perry G, Bowen J, Malone K, Grimes S. Preliminary Results of a Randomized Trial of Optimal Timing of Dose Escalated (76 Gy) Radiation and 6 months ADT in Prostate Cancer. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Cherpak AJ, Cygler JE, Kertzscher G, E C, Perry G. Poster - Thur Eve - 03: LDR to HDR: RADPOS applications in brachytherapy. Med Phys 2012; 39:4624. [PMID: 28516533 DOI: 10.1118/1.4740110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The RADPOS in vivo dosimetry system combines an electromagnetic positioning sensor and either one or five MOSFET dosimeters. The feasibility of using the system for quality control has been explored for a range of radiotherapy treatment techniques including most recently transperineal interstitial permanent prostate brachytherapy and high dose rate (HDR) treatments. Dose and position information was collected by a RADPOS array detector inside a Foley catheter within patients' urethra during permanent seed implantation. Ten patients were studied, and average displacement during implantation was Δr = (1.4-5.1) mm, with movements up to 9.7 mm due to the removal of the transrectal ultrasound probe. Maximum integral dose in the prostatic urethra ranged from 110-195 Gy, and it was found that the dose can change up to 63 cGy (62.0%) depending on whether the rectal probe is in place. For HDR, a RADPOS detector was first calibrated with an Ir-192 source. A treatment was then simulated using a total of 50 dwell positions in 5 catheters in an acrylic phantom. Dwell positions ranged from 1 to 10 cm away from the RADPOS detector and dose was measured for each source position. An average calibration coefficient of 0.74±0.11 cGy/mV was calculated for the detector and the average absolute difference between measured values and expected dose was 0.7±5.4 cGy (5±20%). The demonstrated accuracy of RADPOS dose measurements along with its ability to simultaneously measure displacement makes it a powerful tool for brachytherapy treatments, where high dose gradients can present unique in vivo dosimetry challenges.
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J. Bonda D, J. Castellani R, Zhu X, Nunomura A, Lee HG, Perry G, A. Smith M. A Novel Perspective on Tau in Alzheimers Disease. Curr Alzheimer Res 2011; 8:639-42. [DOI: 10.2174/156720511796717131] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Revised: 04/10/2011] [Accepted: 04/16/2011] [Indexed: 11/22/2022]
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Cherpak A, Cygler J, E C, Perry G. SU-E-T-390: Real-Time Measurement of Urethral Dose and Position Using a RADPOS Array during Permanent Seed Implantation for Prostate Brachytherapy. Med Phys 2011. [DOI: 10.1118/1.3612344] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Cygler J, Cherpak A, Monica S, Seuntjens J, MacRae R, Pantarotto J, Perry G. 525 oral CAPABILITIES OF RADPOS, 4D IN VIVO DOSIMETRY SYSTEM. Radiother Oncol 2011. [DOI: 10.1016/s0167-8140(11)70647-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Tipoo F, Perry G, Leong D, Joseph M, De Pasquale C, Selvanayagam J. Cardiovascular Magnetic Resonance Validation of Echocardiographic Evaluation of Left Ventricular Hypertrophy. Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Cherpak AJ, Cygler JE, Andrusyk S, Pantarotto J, MacRae R, Perry G. Poster - Thur Eve - 13: Monitoring the Breathing Patterns of Lung Patients throughout the Course of Treatment - Preliminary Experience with the RADPOS System. Med Phys 2010. [DOI: 10.1118/1.3476118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Cherpak A, Cygler J, Andrusyk S, Pantarotto J, MacRae R, Perry G. SU-GG-T-341: Initial Results of Real-Time External Surface Motion and Dose Monitoring Study for Lung Patients. Med Phys 2010. [DOI: 10.1118/1.3468738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Cherpak AJ, Cygler JE, Andrusyk S, Pantarotto J, MacRae R, Lochrin C, Perry G. Sci-Wed PM: Delivery-02: Characterization and Clinical Evaluation of RADPOS 4D in vivo
Dosimetry System. Med Phys 2009. [DOI: 10.1118/1.3244094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Perry G, Ames B, Aliev G. Is oxidative stress an initiator of mitochondrial failure and vascular hypoperfusion during aging and Alzheimer disease? Present and future. J Neurol Sci 2009. [DOI: 10.1016/j.jns.2009.02.122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Perry G, Cherpak A, Cygler J, Andrusyk S, Panarotto J, Macrae R, Lochrin C. 121P CLINICAL EVALUATION OF A NOVEL 4D IN-VIVO DOSIMETRY SYSTEM FOR LUNG CANCER RADIOTHERAPY. Lung Cancer 2009. [DOI: 10.1016/s0169-5002(09)70244-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Su B, Wang X, Nunomura A, Moreira PI, Lee HG, Perry G, Smith MA, Zhu X. Oxidative stress signaling in Alzheimer's disease. Curr Alzheimer Res 2009; 5:525-32. [PMID: 19075578 DOI: 10.2174/156720508786898451] [Citation(s) in RCA: 199] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Multiple lines of evidence demonstrate that oxidative stress is an early event in Alzheimer's disease (AD), occurring prior to cytopathology, and therefore may play a key pathogenic role in AD. Oxidative stress not only temporally precedes the pathological lesions of the disease but also activates cell signaling pathways, which, in turn, contribute to lesion formation and, at the same time, provoke cellular responses such as compensatory upregulation of antioxidant enzymes found in vulnerable neurons in AD. In this review, we provide an overview of the evidence of oxidative stress and compensatory responses that occur in AD, particularly focused on potential sources of oxidative stress and the roles and mechanism of activation of stress-activated protein kinase pathways.
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Crook J, Ludgate C, Malone S, Eapen L, Perry G, Bowen J, Robertson S, Lockwood G. Final Report of a Canadian Phase III Trial of 3 vs 8 months Neoadjuvant Androgen Deprivation Prior to 66 Gray External Beam Radiotherapy for Clinically Localized Prostate Cancer. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.936] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Zhu X, Wang Y, Ogawa O, Lee HG, Raina AK, Fujioka H, Shimohama S, Atwood CS, Petersen RB, Perry G, Smith MA. Oral Presentations OP01: Neurodegenerative Diseases. J Neurochem 2008. [DOI: 10.1046/j.1471-4159.81.s1.44_1.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Nunomura A, Moreira PI, Lee HG, Zhu X, Castellani RJ, Smith MA, Perry G. Neuronal death and survival under oxidative stress in Alzheimer and Parkinson diseases. CNS & NEUROLOGICAL DISORDERS-DRUG TARGETS 2008; 6:411-23. [PMID: 18220780 DOI: 10.2174/187152707783399201] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Neuronal death is a common feature in neurodegenerative diseases including Alzheimer disease (AD) and Parkinson disease (PD). This occurs over years, not the minutes of classically defined apoptosis, and neurons show both responses of apoptosis and regeneration, evidenced by accumulated oxidative insult and attempts at cell cycle re-entry. There is recent evidence suggesting that several known gene mutations in causing familial AD (amyloid beta protein precursor, presenilin-1, or presenilin-2 gene) and familial PD (Parkin, PINK-1, or DJ-1 gene) are associated with increased oxidative stress. Also, several known genetic (e.g. Apolipoprotein Eepsilon4 variant) and environmental (e.g. metals or pesticides exposure) risk factors of sporadic AD and/or PD are associated with increased oxidative stress. In concord, patients at the preclinical stages of AD and PD as well as cellular and animal models of the diseases provide consistent evidence that oxidative insult is a significant early event in the pathological cascade of AD and PD. In contrast to the general aspects of the pathological hallmarks, aggregation of the disease-specific proteins such as amyloid-beta, tau, and alpha-synuclein may act as a compensatory (survival) response against the oxidative insult via the mechanism that the disease-specific structures sequester redox-active metals. Expanding knowledge of the molecular mechanisms of organism longevity indicates that pro-longevity gene products such as forkhead transcription factors and sirtuins are involved in the insulin-like signaling pathway and oxidative stress resistance against aging. An enhancement of the pro-longevity signaling (e.g. caloric restriction) may be a promising approach as anti-oxidative strategy against age-associated neurodegenerative diseases.
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Aliev G, Liu J, Puchowicz M, Xu K, Siedlak S, Obrenovich M, Shenk J, Smith M, Gasimov E, LaManna J, Ames B, Perry G. DOES THE OXIDATIVE STRESS AND CEREBRAL ATHEROSCLEROSIS INITIATE BRAIN HYPOPERFUSION AND THE DEVELOPMENT OF ALZHEIMER DISEASE? ATHEROSCLEROSIS SUPP 2008. [DOI: 10.1016/s1567-5688(08)70622-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Nunomura A, Moreira PI, Takeda A, Smith MA, Perry G. Oxidative RNA damage and neurodegeneration. Curr Med Chem 2008; 14:2968-75. [PMID: 18220733 DOI: 10.2174/092986707782794078] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Although cellular RNA should be subject to the same oxidative insults as DNA and other cellular macromolecules, oxidative damage to RNA has not been a major focus in investigating the magnitude and the biological consequences of the free radical damage. However, because RNA is mostly single-stranded and its bases are not protected by hydrogen bonding and are less protected by specific proteins, RNA may be more susceptible to oxidative insults than DNA. Thereafter, oxidative damage to protein-coding RNA or non-coding RNA will potentially cause errors in proteins or dysregulation of gene expression. While less lethal than mutations in genome, such non-acutely lethal insults to cells might be associated with underlying mechanisms of several human diseases, especially chronic degeneration. Recently, oxidative RNA damage has been described in several neurodegenerative diseases including Alzheimer disease, Parkinson disease, dementia with Lewy bodies, and prion diseases. Of particular interest, oxidative RNA damage is a feature in vulnerable neurons at the very earliest-stages of these diseases, suggesting that RNA oxidation may actively contribute to the onset or to the development of disease. Mechanistically speaking, an increasing body of evidence suggests that the detrimental effects of oxidative RNA damage to protein synthesis are attenuated, at least in part, by the existence of mechanisms that avoid the incorporation of the damaged ribonucleotides into the translational machinery. Further investigations toward understanding of the consequences and processing mechanisms related to oxidative RNA damage may provide significant insights into the pathogenesis and therapeutic strategies for neurodegenerative and other degenerative diseases.
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