16 results on '"Rzechorzek, Nina M"'
Search Results
2. Macromolecular condensation buffers intracellular water potential
- Author
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Watson, Joseph L., Seinkmane, Estere, Styles, Christine T., Mihut, Andrei, Krüger, Lara K., McNally, Kerrie E., Planelles-Herrero, Vicente Jose, Dudek, Michal, McCall, Patrick M., Barbiero, Silvia, Vanden Oever, Michael, Peak-Chew, Sew Yeu, Porebski, Benjamin T., Zeng, Aiwei, Rzechorzek, Nina M., Wong, David C. S., Beale, Andrew D., Stangherlin, Alessandra, Riggi, Margot, Iwasa, Janet, Morf, Jörg, Miliotis, Christos, Guna, Alina, Inglis, Alison J., Brugués, Jan, Voorhees, Rebecca M., Chambers, Joseph E., Meng, Qing-Jun, O’Neill, John S., Edgar, Rachel S., and Derivery, Emmanuel
- Published
- 2023
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3. Author Correction: Macromolecular condensation buffers intracellular water potential
- Author
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Watson, Joseph L., Seinkmane, Estere, Styles, Christine T., Mihut, Andrei, Krüger, Lara K., McNally, Kerrie E., Planelles-Herrero, Vicente Jose, Dudek, Michal, McCall, Patrick M., Barbiero, Silvia, Vanden Oever, Michael, Peak-Chew, Sew Yeu, Porebski, Benjamin T., Zeng, Aiwei, Rzechorzek, Nina M., Wong, David C. S., Beale, Andrew D., Stangherlin, Alessandra, Riggi, Margot, Iwasa, Janet, Morf, Jörg, Miliotis, Christos, Guna, Alina, Inglis, Alison J., Brugués, Jan, Voorhees, Rebecca M., Chambers, Joseph E., Meng, Qing-Jun, O’Neill, John S., Edgar, Rachel S., and Derivery, Emmanuel
- Published
- 2024
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4. Human stem cell–derived astrocytes replicate human prions in a PRNP genotype–dependent manner
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Krejciova, Zuzana, Alibhai, James, Zhao, Chen, Krencik, Robert, Rzechorzek, Nina M, Ullian, Erik M, Manson, Jean, Ironside, James W, Head, Mark W, and Chandran, Siddharthan
- Subjects
Transmissible Spongiform Encephalopathy (TSE) ,Stem Cell Research - Induced Pluripotent Stem Cell - Human ,Stem Cell Research ,Genetics ,Neurosciences ,Infectious Diseases ,Stem Cell Research - Induced Pluripotent Stem Cell ,Rare Diseases ,Neurodegenerative ,Brain Disorders ,Clinical Research ,Foodborne Illness ,Stem Cell Research - Nonembryonic - Human ,Emerging Infectious Diseases ,2.1 Biological and endogenous factors ,Aetiology ,Neurological ,Good Health and Well Being ,Adult ,Astrocytes ,Cells ,Cultured ,Codon ,Creutzfeldt-Jakob Syndrome ,Female ,Genotype ,Humans ,Induced Pluripotent Stem Cells ,Kinetics ,Male ,Middle Aged ,Prion Proteins ,Prions ,Young Adult ,Medical and Health Sciences ,Immunology - Abstract
Prions are infectious agents that cause neurodegenerative diseases such as Creutzfeldt-Jakob disease (CJD). The absence of a human cell culture model that replicates human prions has hampered prion disease research for decades. In this paper, we show that astrocytes derived from human induced pluripotent stem cells (iPSCs) support the replication of prions from brain samples of CJD patients. For experimental exposure of astrocytes to variant CJD (vCJD), the kinetics of prion replication occur in a prion protein codon 129 genotype-dependent manner, reflecting the genotype-dependent susceptibility to clinical vCJD found in patients. Furthermore, iPSC-derived astrocytes can replicate prions associated with the major sporadic CJD strains found in human patients. Lastly, we demonstrate the subpassage of prions from infected to naive astrocyte cultures, indicating the generation of prion infectivity in vitro. Our study addresses a long-standing gap in the repertoire of human prion disease research, providing a new in vitro system for accelerated mechanistic studies and drug discovery.
- Published
- 2017
5. Network analysis of canine brain morphometry links tumour risk to oestrogen deficiency and accelerated brain ageing
- Author
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Rzechorzek, Nina M., Saunders, Olivia M., Hiscox, Lucy V., Schwarz, Tobias, Marioni-Henry, Katia, Argyle, David J., Schoenebeck, Jeffrey J., and Freeman, Tom C.
- Published
- 2019
- Full Text
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6. Healthy human brains have a daily heatwave.
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Rzechorzek, Nina M. and O'Neill, John S.
- Subjects
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HEAT waves (Meteorology) , *BODY temperature , *NON-REM sleep , *RAPID eye movement sleep - Abstract
Some clinical studies report that I T i SB Br sb increases after brain injury and some patients undergo interventions to achieve a "normal" I T i SB Br sb . If I T i SB Br sb rhythms are similarly affected, it will be critical to establish how normal I T i SB Br sb variation interacts with the daily neural molecular clockwork before inferring a role for I T i SB Br sb disruption in disease. Daily variations in I T i SB Br sb are demonstrable in rodents and non-human primates; in the latter, I T i SB Br sb is consistently higher than carotid artery, aortic arch, and abdominal cavity temperature, and exhibits its own spatial gradient [[1]]. To address this gap, we undertook a retrospective analysis of I T i SB Br sb measured directly in patients with traumatic brain injury, alongside a prospective study of I T i SB Br sb measured non-invasively in healthy adults using magnetic resonance spectroscopy (MRS) [[1]]. [Extracted from the article]
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- 2023
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7. Modelling Neurological Diseases in Large Animals: Criteria for Model Selection and Clinical Assessment.
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Eaton, Samantha L., Murdoch, Fraser, Rzechorzek, Nina M., Thompson, Gerard, Hartley, Claudia, Blacklock, Benjamin Thomas, Proudfoot, Chris, Lillico, Simon G., Tennant, Peter, Ritchie, Adrian, Nixon, James, Brennan, Paul M., Guido, Stefano, Mitchell, Nadia L., Palmer, David N., Whitelaw, C. Bruce A., Cooper, Jonathan D., and Wishart, Thomas M.
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NEUROLOGICAL disorders ,ANIMAL diseases ,ANIMAL models in research ,NEUROLOGIC examination ,ANIMAL species - Abstract
Issue: The impact of neurological disorders is recognised globally, with one in six people affected in their lifetime and few treatments to slow or halt disease progression. This is due in part to the increasing ageing population, and is confounded by the high failure rate of translation from rodent-derived therapeutics to clinically effective human neurological interventions. Improved translation is demonstrated using higher order mammals with more complex/comparable neuroanatomy. These animals effectually span this translational disparity and increase confidence in factors including routes of administration/dosing and ability to scale, such that potential therapeutics will have successful outcomes when moving to patients. Coupled with advancements in genetic engineering to produce genetically tailored models, livestock are increasingly being used to bridge this translational gap. Approach: In order to aid in standardising characterisation of such models, we provide comprehensive neurological assessment protocols designed to inform on neuroanatomical dysfunction and/or lesion(s) for large animal species. We also describe the applicability of these exams in different large animals to help provide a better understanding of the practicalities of cross species neurological disease modelling. Recommendation: We would encourage the use of these assessments as a reference framework to help standardise neurological clinical scoring of large animal models. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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8. A daily temperature rhythm in the human brain predicts survival after brain injury.
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Rzechorzek, Nina M, Thrippleton, Michael J, Chappell, Francesca M, Mair, Grant, Ercole, Ari, Cabeleira, Manuel, Investigators, The CENTER-TBI High Resolution ICU (HR ICU) Sub-Study Participants and, Rhodes, Jonathan, Marshall, Ian, O'Neill, John S, and CENTER-TBI High Resolution ICU (HR ICU) Sub-Study Participants and Investigators
- Abstract
Patients undergo interventions to achieve a 'normal' brain temperature; a parameter that remains undefined for humans. The profound sensitivity of neuronal function to temperature implies the brain should be isothermal, but observations from patients and non-human primates suggest significant spatiotemporal variation. We aimed to determine the clinical relevance of brain temperature in patients by establishing how much it varies in healthy adults. We retrospectively screened data for all patients recruited to the Collaborative European NeuroTrauma Effectiveness Research in Traumatic Brain Injury (CENTER-TBI) High Resolution Intensive Care Unit Sub-Study. Only patients with direct brain temperature measurements and without targeted temperature management were included. To interpret patient analyses, we prospectively recruited 40 healthy adults (20 males, 20 females, 20-40 years) for brain thermometry using magnetic resonance spectroscopy. Participants were scanned in the morning, afternoon, and late evening of a single day. In patients (n = 114), brain temperature ranged from 32.6 to 42.3°C and mean brain temperature (38.5 ± 0.8°C) exceeded body temperature (37.5 ± 0.5°C, P < 0.0001). Of 100 patients eligible for brain temperature rhythm analysis, 25 displayed a daily rhythm, and the brain temperature range decreased in older patients (P = 0.018). In healthy participants, brain temperature ranged from 36.1 to 40.9°C; mean brain temperature (38.5 ± 0.4°C) exceeded oral temperature (36.0 ± 0.5°C) and was 0.36°C higher in luteal females relative to follicular females and males (P = 0.0006 and P < 0.0001, respectively). Temperature increased with age, most notably in deep brain regions (0.6°C over 20 years, P = 0.0002), and varied spatially by 2.41 ± 0.46°C with highest temperatures in the thalamus. Brain temperature varied by time of day, especially in deep regions (0.86°C, P = 0.0001), and was lowest at night. From the healthy data we built HEATWAVE-a 4D map of human brain temperature. Testing the clinical relevance of HEATWAVE in patients, we found that lack of a daily brain temperature rhythm increased the odds of death in intensive care 21-fold (P = 0.016), whilst absolute temperature maxima or minima did not predict outcome. A warmer mean brain temperature was associated with survival (P = 0.035), however, and ageing by 10 years increased the odds of death 11-fold (P = 0.0002). Human brain temperature is higher and varies more than previously assumed-by age, sex, menstrual cycle, brain region, and time of day. This has major implications for temperature monitoring and management, with daily brain temperature rhythmicity emerging as one of the strongest single predictors of survival after brain injury. We conclude that daily rhythmic brain temperature variation-not absolute brain temperature-is one way in which human brain physiology may be distinguished from pathophysiology. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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9. CRYPTOCHROMES promote daily protein homeostasis.
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Wong, David C S, Seinkmane, Estere, Zeng, Aiwei, Stangherlin, Alessandra, Rzechorzek, Nina M, Beale, Andrew D, Day, Jason, Reed, Martin, Peak‐Chew, Sew Y, Styles, Christine T, Edgar, Rachel S, Putker, Marrit, and O'Neill, John S
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CRYPTOCHROMES ,ION transport (Biology) ,CELL physiology ,HOMEOSTASIS ,PROTEINS ,MOLECULAR clock ,CIRCADIAN rhythms ,CLOCK genes - Abstract
The daily organisation of most mammalian cellular functions is attributed to circadian regulation of clock‐controlled protein expression, driven by daily cycles of CRYPTOCHROME‐dependent transcriptional feedback repression. To test this, we used quantitative mass spectrometry to compare wild‐type and CRY‐deficient fibroblasts under constant conditions. In CRY‐deficient cells, we found that temporal variation in protein, phosphopeptide, and K+ abundance was at least as great as wild‐type controls. Most strikingly, the extent of temporal variation within either genotype was much smaller than overall differences in proteome composition between WT and CRY‐deficient cells. This proteome imbalance in CRY‐deficient cells and tissues was associated with increased susceptibility to proteotoxic stress, which impairs circadian robustness, and may contribute to the wide‐ranging phenotypes of CRY‐deficient mice. Rather than generating large‐scale daily variation in proteome composition, we suggest it is plausible that the various transcriptional and post‐translational functions of CRY proteins ultimately act to maintain protein and osmotic homeostasis against daily perturbation. Synopsis: CRYPTOCHROMES regulate proteome composition but are not required for its circadian organisation. Loss of these global transcriptional regulators leads to proteotoxic stress, which impairs the daily organisation of physiology in both cells and mice. Circadian protein abundance, phosphorylation and ion transport do not require CRYPTOCHROMEs.CRYPTOCHROME‐deficient cells and tissues show increased proteotoxic stress.Proteotoxic stress impairs the robustness of circadian rhythms in cells and mice.CRYPTOCHROME primarily functions to suppress temporal variation in proteome composition. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
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10. CRYPTOCHROMES confer robustness, not rhythmicity, to circadian timekeeping.
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Putker, Marrit, Wong, David C S, Seinkmane, Estere, Rzechorzek, Nina M, Zeng, Aiwei, Hoyle, Nathaniel P, Chesham, Johanna E, Edwards, Mathew D, Feeney, Kevin A, Fischer, Robin, Peschel, Nicolai, Chen, Ko‐Fan, Vanden Oever, Michael, Edgar, Rachel S, Selby, Christopher P, Sancar, Aziz, and O'Neill, John S
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CIRCADIAN rhythms ,CRYPTOCHROMES ,TIMEKEEPING ,PROTEIN stability ,CLOCK genes ,BIOLOGICAL rhythms ,MOLECULAR clock - Abstract
Circadian rhythms are a pervasive property of mammalian cells, tissues and behaviour, ensuring physiological adaptation to solar time. Models of cellular timekeeping revolve around transcriptional feedback repression, whereby CLOCK and BMAL1 activate the expression of PERIOD (PER) and CRYPTOCHROME (CRY), which in turn repress CLOCK/BMAL1 activity. CRY proteins are therefore considered essential components of the cellular clock mechanism, supported by behavioural arrhythmicity of CRY‐deficient (CKO) mice under constant conditions. Challenging this interpretation, we find locomotor rhythms in adult CKO mice under specific environmental conditions and circadian rhythms in cellular PER2 levels when CRY is absent. CRY‐less oscillations are variable in their expression and have shorter periods than wild‐type controls. Importantly, we find classic circadian hallmarks such as temperature compensation and period determination by CK1δ/ε activity to be maintained. In the absence of CRY‐mediated feedback repression and rhythmic Per2 transcription, PER2 protein rhythms are sustained for several cycles, accompanied by circadian variation in protein stability. We suggest that, whereas circadian transcriptional feedback imparts robustness and functionality onto biological clocks, the core timekeeping mechanism is post‐translational. SYNOPSIS: CRYPTOCHROME (CRY) proteins are central regulators of the circadian clock transcription/translation feedback loop. The finding that circadian timekeeping persists, albeit with reduced robustness, in CRY‐deficient cells and mice suggests that clock gene activity is determined by evolutionarily‐conserved post‐translational timing mechanisms. CRY‐mediated transcriptional feedback is dispensable for circadian timekeeping in mammalian cells, but functions to make rhythms more robust.CRY knockout mice exhibit behavioural rhythmicity under specific environmental conditions.Circadian variation in the abundance of core clock component PER2 is amplified by, but does not require, rhythmic Per2 transcription.CK1 and GSK3 kinases regulate PER2 stability in the absence of CRY. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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11. Hypothermic modulation of human cortical neurons to explore a role for tau protein in neuroprotection
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Rzechorzek, Nina M, Connick, Peter, Livesey, Matthew R, Borooah, Shyamanga, Patani, Rickie, Burr, Karen, Story, David, Wyllie, David J A, Hardingham, Giles E, and Chandran, Siddharthan
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- 2016
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12. Sheep Lung Segmental Delivery Strategy Demonstrates Adenovirus Priming of Local Lung Responses to Bacterial LPS and the Role of Elafin as a Response Modulator.
- Author
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Brown, Thomas I., Collie, David S., Shaw, Darren J., Rzechorzek, Nina M., and Sallenave, Jean-Michel
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ADENOVIRUSES ,ENDOTOXINS ,BACTERIAL diseases ,LYMPHOPENIA ,MYELOPEROXIDASE ,MACROPHAGES ,PHAGOCYTOSIS - Abstract
Viral lung infections increase susceptibility to subsequent bacterial infection. We questioned whether local lung administration of recombinant adenoviral vectors in the sheep would alter the susceptibility of the lung to subsequent challenge with bacterial lipopolysaccharide (LPS). We further questioned whether local lung expression of elafin, a locally produced alarm anti-LPS/anti-bacterial molecule, would modulate the challenge response. We established that adenoviral vector treatment primed the lung for an enhanced response to bacterial LPS. Whereas this local effect appeared to be independent of the transgene used (Ad-o-elafin or Ad-GFP), Ad-o-elafin treated sheep demonstrated a more profound lymphopenia in response to local lung administration of LPS. The local influence of elafin in modulating the response to LPS was restricted to maintaining neutrophil myeloperoxidase activity, and levels of alveolar macrophage and neutrophil phagocytosis at higher levels post-LPS. Adenoviral vector-bacterial synergism exists in the ovine lung and elafin expression modulates such synergism both locally and systemically. [ABSTRACT FROM AUTHOR]
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- 2014
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13. Maturation of AMPAR Composition and the GABAAR Reversal Potential in hPSC-Derived Cortical Neurons.
- Author
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Livesey, Matthew R., Bilican, Bilada, Jing Qiu, Rzechorzek, Nina M., Haghi, Ghazal, Burr, Karen, Hardingham, Giles E., Chandran, Siddharthan, and Wyllie, David J. A.
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NEURONS ,EXCITATION (Physiology) ,PLURIPOTENT stem cells ,HUMAN stem cells ,NEUROTROPHINS - Abstract
Rodent-based studies have shown that neurons undergo major developmental changes to ion channel expression and ionic gradients that determine their excitation-inhibition balance. Neurons derived from human pluripotent stem cells theoretically offer the potential to study classical developmental processes in a human-relevant system, although this is currently not well explored. Here, we show that excitatory cortical-patterned neurons derived from multiple human pluripotent stem cell lines exhibit native-like maturation changes inAMPARcomposition such that there is an increase in the expression of GluA2(R) subunits. Moreover, we observe a dynamic shift in intracellular Cl
- levels, which determines the reversal potential ofGABAAR-mediated currents and is influenced by neurotrophic factors. The shift is concomitant with changes in KCC2 and NKCC1 expression. Because some human diseases are thought to involve perturbations to AMPAR GluA2 content and others in the chloride reversal potential,humanstem-cell-derived neurons represent a valuable tool for studying these fundamental properties. [ABSTRACT FROM AUTHOR]- Published
- 2014
- Full Text
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14. Network Analysis Reveals Distinct Clinical Syndromes Underlying Acute Mountain Sickness.
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Hall, David P., MacCormick, Ian J. C., Phythian-Adams, Alex T., Rzechorzek, Nina M., Hope-Jones, David, Cosens, Sorrel, Jackson, Stewart, Bates, Matthew G. D., Collier, David J., Hume, David A., Freeman, Thomas, Thompson, A. A. Roger, and Baillie, John Kenneth
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MOUNTAIN sickness ,EDEMA ,LUNG diseases ,SYMPTOMS ,FATIGUE (Physiology) ,SLEEP disorders - Abstract
Acute mountain sickness (AMS) is a common problem among visitors at high altitude, and may progress to life-threatening pulmonary and cerebral oedema in a minority of cases. International consensus defines AMS as a constellation of subjective, non-specific symptoms. Specifically, headache, sleep disturbance, fatigue and dizziness are given equal diagnostic weighting. Different pathophysiological mechanisms are now thought to underlie headache and sleep disturbance during acute exposure to high altitude. Hence, these symptoms may not belong together as a single syndrome. Using a novel visual analogue scale (VAS), we sought to undertake a systematic exploration of the symptomatology of AMS using an unbiased, data-driven approach originally designed for analysis of gene expression. Symptom scores were collected from 292 subjects during 1110 subject-days at altitudes between 3650 m and 5200 m on Apex expeditions to Bolivia and Kilimanjaro. Three distinct patterns of symptoms were consistently identified. Although fatigue is a ubiquitous finding, sleep disturbance and headache are each commonly reported without the other. The commonest pattern of symptoms was sleep disturbance and fatigue, with little or no headache. In subjects reporting severe headache, 40% did not report sleep disturbance. Sleep disturbance correlates poorly with other symptoms of AMS (Mean Spearman correlation 0.25). These results challenge the accepted paradigm that AMS is a single disease process and describe at least two distinct syndromes following acute ascent to high altitude. This approach to analysing symptom patterns has potential utility in other clinical syndromes. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
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15. Hypothermic Preconditioning Reverses Tau Ontogenesis in Human Cortical Neurons and is Mimicked by Protein Phosphatase 2A Inhibition.
- Author
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Rzechorzek NM, Connick P, Livesey MR, Borooah S, Patani R, Burr K, Story D, Wyllie DJA, Hardingham GE, and Chandran S
- Subjects
- Gene Expression, Glutamic Acid toxicity, Humans, Hypothermia, Induced, Neural Stem Cells cytology, Neural Stem Cells metabolism, Neurons cytology, Neurons drug effects, Oxidative Stress, Phosphorylation, Protein Phosphatase 2 metabolism, Receptors, N-Methyl-D-Aspartate metabolism, Temperature, tau Proteins genetics, Cerebral Cortex cytology, Cerebral Cortex metabolism, Hypothermia, Neurons metabolism, Protein Phosphatase 2 antagonists & inhibitors, tau Proteins metabolism
- Abstract
Hypothermia is potently neuroprotective, but the molecular basis of this effect remains obscure. Changes in neuronal tau protein are of interest, since tau becomes hyperphosphorylated in injury-resistant, hypothermic brains. Noting inter-species differences in tau isoforms, we have used functional cortical neurons differentiated from human pluripotent stem cells (hCNs) to interrogate tau modulation during hypothermic preconditioning at clinically-relevant temperatures. Key tau developmental transitions (phosphorylation status and splicing shift) are recapitulated during hCN differentiation and subsequently reversed by mild (32 °C) to moderate (28 °C) cooling--conditions which reduce oxidative and excitotoxic stress-mediated injury in hCNs. Blocking a major tau kinase decreases hCN tau phosphorylation and abrogates hypothermic neuroprotection, whilst inhibition of protein phosphatase 2A mimics cooling-induced tau hyperphosphorylation and protects normothermic hCNs from oxidative stress. These findings indicate a possible role for phospho-tau in hypothermic preconditioning, and suggest that cooling drives human tau towards an earlier ontogenic phenotype whilst increasing neuronal resilience to common neurotoxic insults. This work provides a critical step forward in understanding how we might exploit the neuroprotective benefits of cooling without cooling patients.
- Published
- 2015
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16. Maturation of AMPAR composition and the GABAAR reversal potential in hPSC-derived cortical neurons.
- Author
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Livesey MR, Bilican B, Qiu J, Rzechorzek NM, Haghi G, Burr K, Hardingham GE, Chandran S, and Wyllie DJ
- Subjects
- Cell Differentiation physiology, Cell Line, Embryonic Stem Cells cytology, Excitatory Postsynaptic Potentials physiology, Female, Humans, Male, Patch-Clamp Techniques, Receptors, AMPA genetics, Receptors, GABA-A genetics, Solute Carrier Family 12, Member 2 genetics, Solute Carrier Family 12, Member 2 physiology, Symporters genetics, Symporters physiology, K Cl- Cotransporters, Cerebral Cortex cytology, Neurons cytology, Neurons physiology, Pluripotent Stem Cells cytology, Receptors, AMPA physiology, Receptors, GABA-A physiology
- Abstract
Rodent-based studies have shown that neurons undergo major developmental changes to ion channel expression and ionic gradients that determine their excitation-inhibition balance. Neurons derived from human pluripotent stem cells theoretically offer the potential to study classical developmental processes in a human-relevant system, although this is currently not well explored. Here, we show that excitatory cortical-patterned neurons derived from multiple human pluripotent stem cell lines exhibit native-like maturation changes in AMPAR composition such that there is an increase in the expression of GluA2(R) subunits. Moreover, we observe a dynamic shift in intracellular Cl- levels, which determines the reversal potential of GABAAR-mediated currents and is influenced by neurotrophic factors. The shift is concomitant with changes in KCC2 and NKCC1 expression. Because some human diseases are thought to involve perturbations to AMPAR GluA2 content and others in the chloride reversal potential, human stem-cell-derived neurons represent a valuable tool for studying these fundamental properties.
- Published
- 2014
- Full Text
- View/download PDF
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