1
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Bak A, Koch H, van Loo KMJ, Schmied K, Gittel B, Weber Y, Ort J, Schwarz N, Tauber SC, Wuttke TV, Delev D. Human organotypic brain slice cultures: a detailed and improved protocol for preparation and long-term maintenance. J Neurosci Methods 2024; 404:110055. [PMID: 38184112 DOI: 10.1016/j.jneumeth.2023.110055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 12/11/2023] [Accepted: 12/31/2023] [Indexed: 01/08/2024]
Abstract
The investigation of the human brain at cellular and microcircuit level remains challenging due to the fragile viability of neuronal tissue, inter- and intra-variability of the samples and limited availability of human brain material. Especially brain slices have proven to be an excellent source to investigate brain physiology and disease at cellular and small network level, overcoming the temporal limits of acute slices. Here we provide a revised, detailed protocol of the production and in-depth knowledge on long-term culturing of such human organotypic brain slice cultures for research purposes. We highlight the critical pitfalls of the culturing process of the human brain tissue and present exemplary results on viral expression, single-cell Patch-Clamp recordings, as well as multi-electrode array recordings as readouts for culture viability, enabling the use of organotypic brain slice cultures of these valuable tissue samples for basic neuroscience and disease modeling (Fig. 1).
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Affiliation(s)
- Aniella Bak
- Department of Epileptology, Neurology, RWTH Aachen University Hospital, Aachen, Germany.
| | - Henner Koch
- Department of Epileptology, Neurology, RWTH Aachen University Hospital, Aachen, Germany
| | - Karen M J van Loo
- Department of Epileptology, Neurology, RWTH Aachen University Hospital, Aachen, Germany; Department of Neurosurgery, RWTH Aachen University, Aachen, Germany
| | - Katharina Schmied
- Department of Epileptology, Neurology, RWTH Aachen University Hospital, Aachen, Germany
| | - Birgit Gittel
- Department of Epileptology, Neurology, RWTH Aachen University Hospital, Aachen, Germany
| | - Yvonne Weber
- Department of Epileptology, Neurology, RWTH Aachen University Hospital, Aachen, Germany
| | - Jonas Ort
- Department of Neurosurgery, RWTH Aachen University, Aachen, Germany
| | - Niklas Schwarz
- Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Simone C Tauber
- Department of Neurology, RWTH Aachen University Hospital, Aachen, Germany
| | - Thomas V Wuttke
- Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany; Department of Neurosurgery, University of Tübingen, Tübingen, Germany
| | - Daniel Delev
- Department of Neurosurgery, RWTH Aachen University, Aachen, Germany; Neurosurgical Artificial Intelligence Laboratory Aachen (NAILA), RWTH Aachen University Hospital, Aachen, Germany; Department of Neurosurgery, University of Erlangen, Erlangen, Germany
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2
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Pan S, Yang PH, DeFreitas D, Ramagiri S, Bayguinov PO, Hacker CD, Snyder AZ, Wilborn J, Huang H, Koller GM, Raval DK, Halupnik GL, Sviben S, Achilefu S, Tang R, Haller G, Quirk JD, Fitzpatrick JAJ, Esakky P, Strahle JM. Gold nanoparticle-enhanced X-ray microtomography of the rodent reveals region-specific cerebrospinal fluid circulation in the brain. Nat Commun 2023; 14:453. [PMID: 36707519 PMCID: PMC9883388 DOI: 10.1038/s41467-023-36083-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 01/12/2023] [Indexed: 01/28/2023] Open
Abstract
Cerebrospinal fluid (CSF) is essential for the development and function of the central nervous system (CNS). However, the brain and its interstitium have largely been thought of as a single entity through which CSF circulates, and it is not known whether specific cell populations within the CNS preferentially interact with the CSF. Here, we develop a technique for CSF tracking, gold nanoparticle-enhanced X-ray microtomography, to achieve micrometer-scale resolution visualization of CSF circulation patterns during development. Using this method and subsequent histological analysis in rodents, we identify previously uncharacterized CSF pathways from the subarachnoid space (particularly the basal cisterns) that mediate CSF-parenchymal interactions involving 24 functional-anatomic cell groupings in the brain and spinal cord. CSF distribution to these areas is largely restricted to early development and is altered in posthemorrhagic hydrocephalus. Our study also presents particle size-dependent CSF circulation patterns through the CNS including interaction between neurons and small CSF tracers, but not large CSF tracers. These findings have implications for understanding the biological basis of normal brain development and the pathogenesis of a broad range of disease states, including hydrocephalus.
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Affiliation(s)
- Shelei Pan
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Peter H Yang
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Dakota DeFreitas
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Sruthi Ramagiri
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Peter O Bayguinov
- Washington University Center for Cellular Imaging, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Carl D Hacker
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Abraham Z Snyder
- Department of Radiology, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
- Department of Neurology, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Jackson Wilborn
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Hengbo Huang
- Department of Radiology, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Gretchen M Koller
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Dhvanii K Raval
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Grace L Halupnik
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Sanja Sviben
- Washington University Center for Cellular Imaging, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Samuel Achilefu
- Department of Biomedical Engineering, UT Southwestern Medical Center, Dallas, TX, 75390, USA
| | - Rui Tang
- Department of Radiology, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Gabriel Haller
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
- Department of Neurology, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
- Department of Genetics, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - James D Quirk
- Department of Radiology, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - James A J Fitzpatrick
- Washington University Center for Cellular Imaging, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
- Department of Neuroscience, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
- Department of Cell Biology and Physiology, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Prabagaran Esakky
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - Jennifer M Strahle
- Department of Neurosurgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA.
- Department of Orthopedic Surgery, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA.
- Department of Pediatrics, Washington University School of Medicine, Washington University in St. Louis, St. Louis, MO, 63110, USA.
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3
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Izsak J, Seth H, Theiss S, Hanse E, Illes S. Human Cerebrospinal Fluid Promotes Neuronal Circuit Maturation of Human Induced Pluripotent Stem Cell-Derived 3D Neural Aggregates. Stem Cell Reports 2021; 14:1044-1059. [PMID: 32521247 PMCID: PMC7355159 DOI: 10.1016/j.stemcr.2020.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 05/06/2020] [Accepted: 05/10/2020] [Indexed: 01/09/2023] Open
Abstract
Human induced pluripotent stem cell (hiPSC)-derived in vitro neural and organoid models resemble fetal, rather than adult brain properties, indicating that currently applied cultivation media and supplements are insufficient to achieve neural maturation beyond the fetal stage. In vivo, cerebrospinal fluid molecules are regulating the transition of the immature fetal human brain into a mature adult brain. By culturing hiPSC-3D neural aggregates in human cerebrospinal fluid (hCSF) obtained from healthy adult individuals, we demonstrate that hCSF rapidly triggers neurogenesis, gliogenesis, synapse formation, neurite outgrowth, suppresses proliferation of residing neural stem cells, and results in the formation of synchronously active neuronal circuits in vitro within 3 days. Thus, a physiologically relevant and adult brain-like milieu triggers maturation of hiPSC-3D neural aggregates into highly functional neuronal circuits in vitro. The approach presented here opens a new avenue to identify novel physiological factors for the improvement of hiPSC neural in vitro models. Human CSF triggers rapidly multiple maturation processes in human 3D neural models Human CSF triggers human neurogenesis and suppresses neural stem cell proliferation Human CSF triggers human astrocyte development, neurite growth, and synapse formation Human CSF triggers the maturation of neurons into highly functional neuronal circuits
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Affiliation(s)
- Julia Izsak
- Institute of Neuroscience and Physiology, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Henrik Seth
- Institute of Neuroscience and Physiology, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Stephan Theiss
- Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany; Result Medical GmbH, Düsseldorf, Germany
| | - Eric Hanse
- Institute of Neuroscience and Physiology, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Sebastian Illes
- Institute of Neuroscience and Physiology, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
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4
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Wickham J, Corna A, Schwarz N, Uysal B, Layer N, Honegger JB, Wuttke TV, Koch H, Zeck G. Human Cerebrospinal Fluid Induces Neuronal Excitability Changes in Resected Human Neocortical and Hippocampal Brain Slices. Front Neurosci 2020; 14:283. [PMID: 32372899 PMCID: PMC7186381 DOI: 10.3389/fnins.2020.00283] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 03/12/2020] [Indexed: 12/22/2022] Open
Abstract
Human cerebrospinal fluid (hCSF) has proven advantageous over conventional medium for culturing both rodent and human brain tissue. In addition, increased activity and synchrony, closer to the dynamic states exclusively recorded in vivo, were reported in rodent slices and cell cultures switching from artificial cerebrospinal fluid (aCSF) to hCSF. This indicates that hCSF possesses properties that are not matched by the aCSF, which is generally used for most electrophysiological recordings. To evaluate the possible significance of using hCSF as an electrophysiological recording medium, also for human brain tissue, we compared the network and single-cell firing properties of human brain slice cultures during perfusion with hCSF and aCSF. For measuring the overall activity from a majority of neurons within neocortical and hippocampal human slices, we used a microelectrode array (MEA) recording technique with 252 electrodes covering an area of 3.2 × 3.2 mm2. A second CMOS-based MEA with 4225 sensors on a 2 × 2 mm2 area was used for detailed mapping of action potential waveforms and cell identification. We found that hCSF increased the number of active electrodes and neurons and the firing rate of the neurons in the slices and induced an increase in the numbers of single channel and population bursts. Interestingly, not only an increase in the overall activity in the slices was observed, but a reconfiguration of the network could also be detected with specific activation and inactivation of subpopulations of neuronal ensembles. In conclusion, hCSF is an important component to consider for future human brain slice studies, especially for experiments designed to mimic parts of physiology and disease observed in vivo.
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Affiliation(s)
- Jenny Wickham
- Neurophysics, Natural and Medical Sciences Institute, University of Tübingen, Reutlingen, Germany
| | - Andrea Corna
- Neurophysics, Natural and Medical Sciences Institute, University of Tübingen, Reutlingen, Germany
- Graduate School of Neural Information Processing/International Max Planck Research School, Tübingen, Germany
- Institute for Ophthalmic Research, University of Tübingen, Tübingen, Germany
| | - Niklas Schwarz
- Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Betül Uysal
- Graduate School of Neural Information Processing/International Max Planck Research School, Tübingen, Germany
- Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Nikolas Layer
- Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | | | - Thomas V. Wuttke
- Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
- Department of Neurosurgery, University of Tübingen, Tübingen, Germany
| | - Henner Koch
- Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
- Department of Epileptology, Neurology, RWTH Aachen University, Aachen, Germany
| | - Günther Zeck
- Neurophysics, Natural and Medical Sciences Institute, University of Tübingen, Reutlingen, Germany
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5
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Komendantov AO, Venkadesh S, Rees CL, Wheeler DW, Hamilton DJ, Ascoli GA. Quantitative firing pattern phenotyping of hippocampal neuron types. Sci Rep 2019; 9:17915. [PMID: 31784578 PMCID: PMC6884469 DOI: 10.1038/s41598-019-52611-w] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 09/20/2019] [Indexed: 01/19/2023] Open
Abstract
Systematically organizing the anatomical, molecular, and physiological properties of cortical neurons is important for understanding their computational functions. Hippocampome.org defines 122 neuron types in the rodent hippocampal formation based on their somatic, axonal, and dendritic locations, putative excitatory/inhibitory outputs, molecular marker expression, and biophysical properties. We augmented the electrophysiological data of this knowledge base by collecting, quantifying, and analyzing the firing responses to depolarizing current injections for every hippocampal neuron type from published experiments. We designed and implemented objective protocols to classify firing patterns based on 5 transients (delay, adapting spiking, rapidly adapting spiking, transient stuttering, and transient slow-wave bursting) and 4 steady states (non-adapting spiking, persistent stuttering, persistent slow-wave bursting, and silence). This automated approach revealed 9 unique (plus one spurious) families of firing pattern phenotypes while distinguishing potential new neuronal subtypes. Novel statistical associations emerged between firing responses and other electrophysiological properties, morphological features, and molecular marker expression. The firing pattern parameters, experimental conditions, spike times, references to the original empirical evidences, and analysis scripts are released open-source through Hippocampome.org for all neuron types, greatly enhancing the existing search and browse capabilities. This information, collated online in human- and machine-accessible form, will help design and interpret both experiments and model simulations.
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Affiliation(s)
- Alexander O Komendantov
- Krasnow Institute for Advanced Study, George Mason University, 4400 University Drive, MS 2A1, Fairfax, Virginia, 2230, USA.
| | - Siva Venkadesh
- Krasnow Institute for Advanced Study, George Mason University, 4400 University Drive, MS 2A1, Fairfax, Virginia, 2230, USA
| | - Christopher L Rees
- Krasnow Institute for Advanced Study, George Mason University, 4400 University Drive, MS 2A1, Fairfax, Virginia, 2230, USA
| | - Diek W Wheeler
- Krasnow Institute for Advanced Study, George Mason University, 4400 University Drive, MS 2A1, Fairfax, Virginia, 2230, USA
| | - David J Hamilton
- Krasnow Institute for Advanced Study, George Mason University, 4400 University Drive, MS 2A1, Fairfax, Virginia, 2230, USA
| | - Giorgio A Ascoli
- Krasnow Institute for Advanced Study, George Mason University, 4400 University Drive, MS 2A1, Fairfax, Virginia, 2230, USA.
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6
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Bjorefeldt A, Roshan F, Forsberg M, Zetterberg H, Hanse E, Fisahn A. Human cerebrospinal fluid promotes spontaneous gamma oscillations in the hippocampus in vitro. Hippocampus 2019; 30:101-113. [PMID: 31313871 DOI: 10.1002/hipo.23135] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 06/11/2019] [Accepted: 06/12/2019] [Indexed: 01/23/2023]
Abstract
Gamma oscillations (30-80 Hz) are fast network activity patterns frequently linked to cognition. They are commonly studied in hippocampal brain slices in vitro, where they can be evoked via pharmacological activation of various receptor families. One limitation of this approach is that neuronal activity is studied in a highly artificial extracellular fluid environment, as provided by artificial cerebrospinal fluid (aCSF). Here, we examine the influence of human cerebrospinal fluid (hCSF) on kainate-evoked and spontaneous gamma oscillations in mouse hippocampus. We show that hCSF, as compared to aCSF of matched electrolyte and glucose composition, increases the power of kainate-evoked gamma oscillations and induces spontaneous gamma activity in areas CA3 and CA1 that is reversed by washout. Bath application of atropine entirely abolished hCSF-induced gamma oscillations, indicating critical contribution from muscarinic acetylcholine receptor-mediated signaling. In separate whole-cell patch clamp recordings from rat hippocampus, hCSF increased theta resonance frequency and strength in pyramidal cells along with enhancement of h-current (Ih ) amplitude. We found no evidence of intrinsic gamma frequency resonance at baseline (aCSF) among fast-spiking interneurons, and this was not altered by hCSF. However, hCSF increased the excitability of fast-spiking interneurons, which likely contributed to gamma rhythmogenesis. Our findings show that hCSF promotes network gamma oscillations in the hippocampus in vitro and suggest that neuromodulators distributed in CSF could have significant influence on neuronal network activity in vivo.
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Affiliation(s)
- Andreas Bjorefeldt
- Department of Physiology, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden.,Department of Neuroscience, Brown University, Providence, Rhode Island
| | - Firoz Roshan
- Neuronal Oscillations Laboratory, Center for Alzheimer Research, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
| | - My Forsberg
- Department of Physiology, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
| | - Henrik Zetterberg
- Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, University of Gothenburg, Molndal, Sweden.,Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Molndal, Sweden.,Department of Neurodegenerative Disease, UCL Institute of Neurology, London, UK.,UK Dementia Research Institute at UCL, London, UK
| | - Eric Hanse
- Department of Physiology, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
| | - André Fisahn
- Neuronal Oscillations Laboratory, Center for Alzheimer Research, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
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7
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Bjorefeldt A, Illes S, Zetterberg H, Hanse E. Neuromodulation via the Cerebrospinal Fluid: Insights from Recent in Vitro Studies. Front Neural Circuits 2018; 12:5. [PMID: 29459822 PMCID: PMC5807333 DOI: 10.3389/fncir.2018.00005] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Accepted: 01/11/2018] [Indexed: 12/11/2022] Open
Abstract
The cerebrospinal fluid (CSF) occupies the brain's ventricles and subarachnoid space and, together with the interstitial fluid (ISF), forms a continuous fluidic network that bathes all cells of the central nervous system (CNS). As such, the CSF is well positioned to actively distribute neuromodulators to neural circuits in vivo via volume transmission. Recent in vitro experimental work in brain slices and neuronal cultures has shown that human CSF indeed contains neuromodulators that strongly influence neuronal activity. Here we briefly summarize these new findings and discuss their potential relevance to neural circuits in health and disease.
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Affiliation(s)
- Andreas Bjorefeldt
- Department of Physiology, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
- Department of Neuroscience, Brown University, Providence, RI, United States
| | - Sebastian Illes
- Department of Physiology, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
| | - Henrik Zetterberg
- Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Gothenburg, Sweden
- Department of Molecular Neuroscience, UCL Institute of Neurology, University College London, London, United Kingdom
- United Kingdom Dementia Research Institute, University College London, London, United Kingdom
| | - Eric Hanse
- Department of Physiology, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
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8
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Guarina L, Calorio C, Gavello D, Moreva E, Traina P, Battiato A, Ditalia Tchernij S, Forneris J, Gai M, Picollo F, Olivero P, Genovese M, Carbone E, Marcantoni A, Carabelli V. Nanodiamonds-induced effects on neuronal firing of mouse hippocampal microcircuits. Sci Rep 2018; 8:2221. [PMID: 29396456 PMCID: PMC5797106 DOI: 10.1038/s41598-018-20528-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 01/11/2018] [Indexed: 01/31/2023] Open
Abstract
Fluorescent nanodiamonds (FND) are carbon-based nanomaterials that can efficiently incorporate optically active photoluminescent centers such as the nitrogen-vacancy complex, thus making them promising candidates as optical biolabels and drug-delivery agents. FNDs exhibit bright fluorescence without photobleaching combined with high uptake rate and low cytotoxicity. Focusing on FNDs interference with neuronal function, here we examined their effect on cultured hippocampal neurons, monitoring the whole network development as well as the electrophysiological properties of single neurons. We observed that FNDs drastically decreased the frequency of inhibitory (from 1.81 Hz to 0.86 Hz) and excitatory (from 1.61 to 0.68 Hz) miniature postsynaptic currents, and consistently reduced action potential (AP) firing frequency (by 36%), as measured by microelectrode arrays. On the contrary, bursts synchronization was preserved, as well as the amplitude of spontaneous inhibitory and excitatory events. Current-clamp recordings revealed that the ratio of neurons responding with AP trains of high-frequency (fast-spiking) versus neurons responding with trains of low-frequency (slow-spiking) was unaltered, suggesting that FNDs exerted a comparable action on neuronal subpopulations. At the single cell level, rapid onset of the somatic AP (“kink”) was drastically reduced in FND-treated neurons, suggesting a reduced contribution of axonal and dendritic components while preserving neuronal excitability.
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Affiliation(s)
- L Guarina
- Department of Drug Science and Technology, "NIS" inter-departmental centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy
| | - C Calorio
- Department of Drug Science and Technology, "NIS" inter-departmental centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy
| | - D Gavello
- Department of Drug Science and Technology, "NIS" inter-departmental centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy
| | - E Moreva
- Istituto Nazionale Ricerca Metrologica, Strada delle Cacce 91, 10135, Torino, Italy
| | - P Traina
- Istituto Nazionale Ricerca Metrologica, Strada delle Cacce 91, 10135, Torino, Italy
| | - A Battiato
- Istituto Nazionale di Fisica Nucleare, sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy
| | - S Ditalia Tchernij
- Department of Physics and "NIS" inter-departmental centre, University of Torino, Via P. Giuria 1, 10125, Torino, Italy.,Istituto Nazionale di Fisica Nucleare, sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy
| | - J Forneris
- Istituto Nazionale di Fisica Nucleare, sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy
| | - M Gai
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126, Torino, Italy
| | - F Picollo
- Department of Physics and "NIS" inter-departmental centre, University of Torino, Via P. Giuria 1, 10125, Torino, Italy.,Istituto Nazionale di Fisica Nucleare, sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy
| | - P Olivero
- Department of Physics and "NIS" inter-departmental centre, University of Torino, Via P. Giuria 1, 10125, Torino, Italy.,Istituto Nazionale di Fisica Nucleare, sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy
| | - M Genovese
- Istituto Nazionale Ricerca Metrologica, Strada delle Cacce 91, 10135, Torino, Italy.,Istituto Nazionale di Fisica Nucleare, sezione di Torino, Via P. Giuria 1, 10125, Torino, Italy
| | - E Carbone
- Department of Drug Science and Technology, "NIS" inter-departmental centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy
| | - A Marcantoni
- Department of Drug Science and Technology, "NIS" inter-departmental centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy
| | - V Carabelli
- Department of Drug Science and Technology, "NIS" inter-departmental centre, University of Torino, Corso Raffaello 30, 10125, Torino, Italy.
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9
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Illes S. More than a drainage fluid: the role of CSF in signaling in the brain and other effects on brain tissue. HANDBOOK OF CLINICAL NEUROLOGY 2018; 146:33-46. [PMID: 29110778 DOI: 10.1016/b978-0-12-804279-3.00003-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Current progress in neuroscience demonstrates that the brain is not an isolated organ and is influenced by the systemic environment and extracerebral processes within the body. In view of this new concept, blood and cerebrospinal fluid (CSF) are important body fluids linking extracerebral and intracerebral processes. For decades, substantial evidence has been accumulated indicating that CSF modulates brain states and influences behavior as well as cognition. This chapter provides an overview of how CSF directly modulates the function of different types of brain cells, such as neurons, neural stem cells, and CSF-contacting cells. Alterations in CSF content occur in most pathologic central nervous system (CNS) conditions. In a classic view, the function of CSF is to drain waste products and detrimental factors derived from diseased brain parenchyma. This chapter presents examples for how intra- and extracerebral pathologic processes lead to alterations in the CSF content. Current knowledge about how pathologically altered CSF influences the functionality of brain cells will be presented. Thereby, it becomes evident that CSF has more than a drainage function and has a causal role for the etiology and pathogenesis of different CNS diseases.
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Affiliation(s)
- Sebastian Illes
- Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
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Wang Y, Yu T, Yuan C, Yuan J, Luo Z, Pan Y, Zhang Y, Zhang Y, Yu B. Effects of propofol on the dopamine, metabolites and GABAA receptors in media prefrontal cortex in freely moving rats. Am J Transl Res 2016; 8:2301-2308. [PMID: 27347337 PMCID: PMC4891442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 02/19/2016] [Indexed: 06/06/2023]
Abstract
Recent researches indicate that the mechanism of anesthetic induce loss of consciousness (LOC) is related to dopamine dysfunction in the media prefrontal cortex (mPFC). Given GABAA receptors are the main target for commonly intravenous anesthetic propofol, in this study, we test whether that propofol induced LOC mediate by GABAA receptors in mPFC through altering the dopamine and its metabolites. In the present study, we use Loss of righting reflex (LORR) and Recovery of righting reflex (RORR) as measure to respectively reflect the status of unconsciousness and consciousness recovery in rats. We imitate the clinical anesthesia process, found the minimum of induction and maintenance concentration of propofol respectively was 11 mg/kg and 40 mg/kg per hour. Then, microdialysis technique was used to observe the change of dopamine (DA), metabolites 3, 4-dihydroxyphenylacetic acid (DOPAC) and homovanillic acid (HVA) before and after intravenous infusion of propofol from caudal vein of freely moving rats. The results showed that propofol can increase the level of DOPAC except HVA, and reduced the level of DA in mPFC during unconsciousness of rats. DOPAC and DA return to the baseline level when the rats began to regain consciousness. Local reverse dialysis infusion of GABAA receptor antagonist GABAzine (50 uM) in mPFC can promote the time of LORR, reduce the time of RORR, and increase the basal level of DOPAC. With this condition, propofol increased HVA instead of DOPAC, whereas the DA was still reduced. These results suggest that propofol may induce unconsciousness by directly inhibiting dopamine release in the mPFC, and this effect does not be mediated by GABAA receptor in mPFC.
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Affiliation(s)
- Yuan Wang
- Department of Anesthesiology, Ruijin Hospital, Shanghai Jiao Tong University School of MedicineShanghai, China
- Guizhou Key Laboratory of Anesthesia and Organ Protection, Zunyi Medical CollegeZunyi, Guizhou, China
| | - Tian Yu
- Guizhou Key Laboratory of Anesthesia and Organ Protection, Zunyi Medical CollegeZunyi, Guizhou, China
| | - Chengdong Yuan
- Guizhou Key Laboratory of Anesthesia and Organ Protection, Zunyi Medical CollegeZunyi, Guizhou, China
| | - Jie Yuan
- Guizhou Key Laboratory of Anesthesia and Organ Protection, Zunyi Medical CollegeZunyi, Guizhou, China
| | - Zhuxin Luo
- Guizhou Key Laboratory of Anesthesia and Organ Protection, Zunyi Medical CollegeZunyi, Guizhou, China
| | - Yunchao Pan
- Guizhou Key Laboratory of Anesthesia and Organ Protection, Zunyi Medical CollegeZunyi, Guizhou, China
| | - Yi Zhang
- Guizhou Key Laboratory of Anesthesia and Organ Protection, Zunyi Medical CollegeZunyi, Guizhou, China
| | - Yu Zhang
- Guizhou Key Laboratory of Anesthesia and Organ Protection, Zunyi Medical CollegeZunyi, Guizhou, China
| | - Buwei Yu
- Department of Anesthesiology, Ruijin Hospital, Shanghai Jiao Tong University School of MedicineShanghai, China
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