Transcranial direct current stimulation promotes the mobility of engrafted NSCs in the rat brain

Transcranial direct current stimulation (tDCS) is used in numerous clinical studies and considered an effective and versatile add‐on therapy in neurorehabilitation. To date, however, the underlying neurobiological mechanisms remain elusive. In a rat model of tDCS, we recently observed a polarity‐dep...

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Veröffentlicht in:NMR in biomedicine 2015-02, Vol.28 (2), p.231-239
Hauptverfasser: Keuters, Meike Hedwig, Aswendt, Markus, Tennstaedt, Annette, Wiedermann, Dirk, Pikhovych, Anton, Rotthues, Steffen, Fink, Gereon Rudolf, Schroeter, Michael, Hoehn, Mathias, Rueger, Maria Adele
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container_issue 2
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container_title NMR in biomedicine
container_volume 28
creator Keuters, Meike Hedwig
Aswendt, Markus
Tennstaedt, Annette
Wiedermann, Dirk
Pikhovych, Anton
Rotthues, Steffen
Fink, Gereon Rudolf
Schroeter, Michael
Hoehn, Mathias
Rueger, Maria Adele
description Transcranial direct current stimulation (tDCS) is used in numerous clinical studies and considered an effective and versatile add‐on therapy in neurorehabilitation. To date, however, the underlying neurobiological mechanisms remain elusive. In a rat model of tDCS, we recently observed a polarity‐dependent accumulation of endogenous neural stem cells (NSCs) in the stimulated cortex. Based upon these findings, we hypothesized that tDCS may exert a direct migratory effect on endogenous NSCs towards the stimulated cortex. Using noninvasive imaging, we here investigated whether tDCS may also cause a directed migration of engrafted NSCs. Murine NSCs were labeled with superparamagnetic particles of iron oxide (SPIOs) and implanted into rat striatum and corpus callosum. MRI was performed (i) immediately after implantation and (ii) after 10 tDCS sessions of anodal or cathodal polarity. Sham‐stimulated rats served as control. Imaging results were validated ex vivo using immunohistochemistry. Overall migratory activity of NSCs almost doubled after anodal tDCS. However, no directed migration within the electric field (i.e. towards or away from the electrode) could be observed. Rather, an undirected outward migration from the center of the graft was detected. Xenograft transplantation induced a neuroinflammatory response that was significantly enhanced following cathodal tDCS. This inflammatory response did not impact negatively on the survival of implanted NSCs. Data suggest that anodal tDCS increases the undirected migratory activity of implanted NSCs. Since the electric field did not guide implanted NSCs over large distances, previously observed polarity‐dependent accumulation of endogenous NSCs in the cortex might have originated from local proliferation. Results enhance our understanding of the neurobiological mechanisms underlying tDCS, and may thereby help to develop a targeted and sustainable application of tDCS in clinical practice. Copyright © 2014 John Wiley & Sons, Ltd. The effects of transcranial direct current stimulation (tDCS) on the migration of neural stem cells (NSCs) in vivo was assessed with MRI. NSCs were labelled with superparamagnetic particles of iron oxide and implanted into the rat brain. MRI was performed (i) immediately after implantation and (ii) after 10 tDCS sessions of anodal or cathodal polarity, compared with sham stimulation. Anodal tDCS led to an almost twofold increase in the migratory activity of engrafted NSCs.
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To date, however, the underlying neurobiological mechanisms remain elusive. In a rat model of tDCS, we recently observed a polarity‐dependent accumulation of endogenous neural stem cells (NSCs) in the stimulated cortex. Based upon these findings, we hypothesized that tDCS may exert a direct migratory effect on endogenous NSCs towards the stimulated cortex. Using noninvasive imaging, we here investigated whether tDCS may also cause a directed migration of engrafted NSCs. Murine NSCs were labeled with superparamagnetic particles of iron oxide (SPIOs) and implanted into rat striatum and corpus callosum. MRI was performed (i) immediately after implantation and (ii) after 10 tDCS sessions of anodal or cathodal polarity. Sham‐stimulated rats served as control. Imaging results were validated ex vivo using immunohistochemistry. Overall migratory activity of NSCs almost doubled after anodal tDCS. However, no directed migration within the electric field (i.e. towards or away from the electrode) could be observed. Rather, an undirected outward migration from the center of the graft was detected. Xenograft transplantation induced a neuroinflammatory response that was significantly enhanced following cathodal tDCS. This inflammatory response did not impact negatively on the survival of implanted NSCs. Data suggest that anodal tDCS increases the undirected migratory activity of implanted NSCs. Since the electric field did not guide implanted NSCs over large distances, previously observed polarity‐dependent accumulation of endogenous NSCs in the cortex might have originated from local proliferation. Results enhance our understanding of the neurobiological mechanisms underlying tDCS, and may thereby help to develop a targeted and sustainable application of tDCS in clinical practice. Copyright © 2014 John Wiley &amp; Sons, Ltd. The effects of transcranial direct current stimulation (tDCS) on the migration of neural stem cells (NSCs) in vivo was assessed with MRI. NSCs were labelled with superparamagnetic particles of iron oxide and implanted into the rat brain. MRI was performed (i) immediately after implantation and (ii) after 10 tDCS sessions of anodal or cathodal polarity, compared with sham stimulation. 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To date, however, the underlying neurobiological mechanisms remain elusive. In a rat model of tDCS, we recently observed a polarity‐dependent accumulation of endogenous neural stem cells (NSCs) in the stimulated cortex. Based upon these findings, we hypothesized that tDCS may exert a direct migratory effect on endogenous NSCs towards the stimulated cortex. Using noninvasive imaging, we here investigated whether tDCS may also cause a directed migration of engrafted NSCs. Murine NSCs were labeled with superparamagnetic particles of iron oxide (SPIOs) and implanted into rat striatum and corpus callosum. MRI was performed (i) immediately after implantation and (ii) after 10 tDCS sessions of anodal or cathodal polarity. Sham‐stimulated rats served as control. Imaging results were validated ex vivo using immunohistochemistry. Overall migratory activity of NSCs almost doubled after anodal tDCS. However, no directed migration within the electric field (i.e. towards or away from the electrode) could be observed. Rather, an undirected outward migration from the center of the graft was detected. Xenograft transplantation induced a neuroinflammatory response that was significantly enhanced following cathodal tDCS. This inflammatory response did not impact negatively on the survival of implanted NSCs. Data suggest that anodal tDCS increases the undirected migratory activity of implanted NSCs. Since the electric field did not guide implanted NSCs over large distances, previously observed polarity‐dependent accumulation of endogenous NSCs in the cortex might have originated from local proliferation. Results enhance our understanding of the neurobiological mechanisms underlying tDCS, and may thereby help to develop a targeted and sustainable application of tDCS in clinical practice. Copyright © 2014 John Wiley &amp; Sons, Ltd. 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To date, however, the underlying neurobiological mechanisms remain elusive. In a rat model of tDCS, we recently observed a polarity‐dependent accumulation of endogenous neural stem cells (NSCs) in the stimulated cortex. Based upon these findings, we hypothesized that tDCS may exert a direct migratory effect on endogenous NSCs towards the stimulated cortex. Using noninvasive imaging, we here investigated whether tDCS may also cause a directed migration of engrafted NSCs. Murine NSCs were labeled with superparamagnetic particles of iron oxide (SPIOs) and implanted into rat striatum and corpus callosum. MRI was performed (i) immediately after implantation and (ii) after 10 tDCS sessions of anodal or cathodal polarity. Sham‐stimulated rats served as control. Imaging results were validated ex vivo using immunohistochemistry. Overall migratory activity of NSCs almost doubled after anodal tDCS. However, no directed migration within the electric field (i.e. towards or away from the electrode) could be observed. Rather, an undirected outward migration from the center of the graft was detected. Xenograft transplantation induced a neuroinflammatory response that was significantly enhanced following cathodal tDCS. This inflammatory response did not impact negatively on the survival of implanted NSCs. Data suggest that anodal tDCS increases the undirected migratory activity of implanted NSCs. Since the electric field did not guide implanted NSCs over large distances, previously observed polarity‐dependent accumulation of endogenous NSCs in the cortex might have originated from local proliferation. Results enhance our understanding of the neurobiological mechanisms underlying tDCS, and may thereby help to develop a targeted and sustainable application of tDCS in clinical practice. Copyright © 2014 John Wiley &amp; Sons, Ltd. The effects of transcranial direct current stimulation (tDCS) on the migration of neural stem cells (NSCs) in vivo was assessed with MRI. NSCs were labelled with superparamagnetic particles of iron oxide and implanted into the rat brain. MRI was performed (i) immediately after implantation and (ii) after 10 tDCS sessions of anodal or cathodal polarity, compared with sham stimulation. Anodal tDCS led to an almost twofold increase in the migratory activity of engrafted NSCs.</abstract><cop>England</cop><pub>Blackwell Publishing Ltd</pub><pmid>25521600</pmid><doi>10.1002/nbm.3244</doi><tpages>9</tpages></addata></record>
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subjects Animals
Astrocytes - drug effects
Astrocytes - metabolism
Brain - metabolism
Cell Line
Cell Movement - drug effects
Cell Survival - drug effects
Electrodes
galvanotaxis
Immunity - drug effects
Immunohistochemistry
Iron - pharmacology
Macrophages - cytology
Macrophages - drug effects
Magnetic Resonance Imaging
Male
Mice
microglia
Microglia - drug effects
Microglia - metabolism
migration
MRI
Neural Stem Cells - cytology
Neural Stem Cells - drug effects
Neural Stem Cells - transplantation
neuroinflammation
phagocytes
Phagocytosis - drug effects
Rats, Wistar
Spio
superparamagnetic particles of iron oxide
Transcranial Direct Current Stimulation
title Transcranial direct current stimulation promotes the mobility of engrafted NSCs in the rat brain
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