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Abstract
Anesthetic and surgical procedures and an electrophysiological method were developed for recording nerve conduction velocity (NCV) of CNS fibers in the murine spinal cord. Under intravenous anesthesia and artificial ventilation the lumbar spinal cord segments L1 to L4 and dorsal roots L3 to L5 on the left side were exposed by laminectomy. After stimulation of the dorsal root L4, a compound action potential (CAP) was recorded at the ipsilateral left fasciculus gracilis at the spinal cord level L1. The latency from stimulation to the CAP together with the measured distance between the electrodes was used for the determination of the NCV. NCV of the fastest fibers in the fasciculus gracilis was observed to be approximately 28 m/s. Reversible decrease of the NCV was measured, in vivo, under general hypothermia. The technique described serves for in vivo electrophysiological investigations of spinal central fibers in wildtype and mutant mice.
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Affiliation(s)
- P Dibaj
- Max-Planck-Institute for Experimental Medicine, Göttingen, Germany.
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Nadrigny F, Le Meur K, Schomburg ED, Safavi-Abbasi S, Dibaj P. Two-photon laser-scanning microscopy for single and repetitive imaging of dorsal and lateral spinal white matter in vivo. Physiol Res 2017; 66:531-537. [PMID: 28248542 DOI: 10.33549/physiolres.933461] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
We developed appropriate surgical procedures for single and repetitive multi-photon imaging of spinal cord in vivo. By intravenous anesthesia, artificial ventilation and laminectomy, acute experiments were performed in the dorsal and lateral white matter. By volatile anesthesia and minimal-invasive surgery, chronic repetitive imaging up to 8 months were performed in the dorsal column through the window between two adjacent spines. Transgenic mouse technology enabled simultaneous imaging of labeled axons, astrocytes and microglia. Repetitive imaging showed positional shifts of microglia over time. These techniques serve for investigations of cellular dynamics and cell-cell interactions in intact and pathologically changed spinal tissue.
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Affiliation(s)
- F Nadrigny
- Max-Planck-Institute for Experimental Medicine, Göttingen, Germany.
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Affiliation(s)
- P. Dibaj
- Zentrum für Neurologie, Asklepios Kliniken Schildautal, Seesen
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Dibaj P, Obermann M. Testen Sie Ihr Fachwissen. Akt Neurol 2016. [DOI: 10.1055/s-0042-112217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- P. Dibaj
- Zentrum für Neurologie, Asklepios Kliniken Schildautal, Seesen
| | - M. Obermann
- Zentrum für Neurologie, Asklepios Kliniken Schildautal, Seesen
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Schnegelsberg M, Dibaj P, Kröger R, Müller S, Obermann M. Testen Sie Ihr Fachwissen. Akt Neurol 2016. [DOI: 10.1055/s-0042-115476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
| | - P. Dibaj
- Zentrum für Neurologie, Asklepios Kliniken Schildautal, Seesen
| | - R. Kröger
- Zentrum für Radiologie, Asklepios Kliniken Schildautal, Seesen
| | - S. Müller
- Pathologisches Institut der LMU München
| | - M. Obermann
- Zentrum für Neurologie, Asklepios Kliniken Schildautal, Seesen
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Dibaj P, Kröger R, Tiede K, Obermann M. Testen Sie Ihr Fachwissen. Akt Neurol 2016. [DOI: 10.1055/s-0042-109259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- P. Dibaj
- Zentrum für Neurologie, Asklepios Kliniken Schildautal, Seesen
| | - R. Kröger
- Zentrum für Radiologie, Asklepios Kliniken Schildautal, Seesen
| | - K. Tiede
- Zentrum für Neurologie, Asklepios Kliniken Schildautal, Seesen
| | - M. Obermann
- Zentrum für Neurologie, Asklepios Kliniken Schildautal, Seesen
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Obermann M, Dibaj P. Testen Sie Ihr Fachwissen. Akt Neurol 2016. [DOI: 10.1055/s-0042-103680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- M. Obermann
- Zentrum für Neurologie, Asklepios Kliniken Schildautal, Seesen
| | - P. Dibaj
- Zentrum für Neurologie, Asklepios Kliniken Schildautal, Seesen
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Schomburg ED, Steffens H, Pilyavskii AI, Maisky VA, Brück W, Dibaj P, Sears TA. Long lasting activity of nociceptive muscular afferents facilitates bilateral flexion reflex pattern in the feline spinal cord. Neurosci Res 2015; 95:51-8. [PMID: 25615850 DOI: 10.1016/j.neures.2015.01.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 12/28/2014] [Accepted: 01/13/2015] [Indexed: 01/10/2023]
Abstract
Chronic muscular limb pain requires the adoption of motor patterns distinct from the classic ipsilateral flexion, crossed extension and corresponding reciprocal inhibitions to acute exteroceptive stimulation. Using selective chemical activation of group III/IV afferents in gastrocnemius-soleus (GS) muscles we investigated bilaterally their reflex responses conditioned by (a) acute 'myositis' induced by intramuscular carrageenan; and (b) sub-acute 'myositis' induced by infusion of complete Freund's adjuvant (CFA). Reflex transmission was detected by monosynaptic testing and c-fos staining used to identify increased neuronal activity. In all control experiments with chemical stimulation of group III/IV afferents, ipsilateral responses conformed to the flexor reflex pattern. However, the expected contralateral facilitation of GS motoneurones occurred in fewer than 50% trials while only 9% of trials induced contralateral inhibition of flexor posterior-biceps-semitendinosus (PBSt) motoneurones. During carrageenan acute myositis contralateral PBSt was transiently facilitated by selective activation of group III/IV afferents. During CFA-induced myositis, contralateral only inhibition of GS motoneurones occurred instead of any facilitation, while bidirectionally a crossed facilitation of PBST dominated. These reflex changes were mirrored in an enhanced number of neurones with enhanced c-fos expression. Muscle pain, particularly if chronically persistent, requires another behavioural response pattern than acute exteroceptive pain.
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Affiliation(s)
- E D Schomburg
- Institute of Physiology, University of Göttingen, Germany.
| | - H Steffens
- Institute of Physiology, University of Göttingen, Germany; Max-Planck-Institute of Biophysical Chemistry, Göttingen, Germany
| | - A I Pilyavskii
- Department of Movement Physiology, Bogomoletz Institute of Physiology, Kiev, Ukraine
| | - V A Maisky
- Department of Movement Physiology, Bogomoletz Institute of Physiology, Kiev, Ukraine
| | - W Brück
- Department of Neuropathology, University of Göttingen, Germany
| | - P Dibaj
- Max-Planck-Institute for Experimental Medicine, Göttingen, Germany
| | - T A Sears
- Wolfson CARD, Guy's Campus, King's College London, UK
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Zschüntzsch J, Schütze S, Hülsmann S, Dibaj P, Neusch C. Heterologous expression of a glial Kir channel (KCNJ10) in a neuroblastoma spinal cord (NSC-34) cell line. Physiol Res 2012; 62:95-105. [PMID: 23173681 DOI: 10.33549/physiolres.932264] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Heterologous expression of Kir channels offers a tool to modulate excitability of neurons which provide insight into Kir channel functions in general. Inwardly-rectifying K+ channels (Kir channels) are potential candidate proteins to hyperpolarize neuronal cell membranes. However, heterologous expression of inwardly-rectifying K+ channels has previously proven to be difficult. This was mainly due to a high toxicity of the respective Kir channel expression. We investigated the putative role of a predominantly glial-expressed, weakly rectifying Kir channel (Kir4.1 channel subunit; KCNJ10) in modulating electrophysiological properties of a motoneuron-like cell culture (NSC-34). Transfection procedures using an EGFP-tagged Kir4.1 protein in this study proved to have no toxic effects on NSC-34 cells. Using whole cell-voltage clamp, a substantial increase of inward rectifying K+ currents as well as hyperpolarization of the cell membrane was observed in Kir4.1-transfected cells. Na+ inward currents, observed in NSC-34 controls, were absent in Kir4.1/EGFP motoneuronal cells. The Kir4.1-transfection did not influence the NaV1.6 sodium channel expression. This study demonstrates the general feasibility of a heterologous expression of a weakly inward-rectifying K+ channel (Kir4.1 subunit) and shows that in vitro overexpression of Kir4.1 shifts electrophysiological properties of neuronal cells to a more glial-like phenotype and may therefore be a candidate tool to dampen excitability of neurons in experimental paradigms.
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Affiliation(s)
- J Zschüntzsch
- Department of Neurology, Georg-August-University, Göttingen, Germany
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Dibaj P. Untersuchungen zur Neuron-Glia-Interaktion in einem Mausmodell für Amyotrophe Lateralsklerose mittels 2-Photonen-Mikroskopie in vivo. KLIN NEUROPHYSIOL 2012. [DOI: 10.1055/s-0032-1316306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- P. Dibaj
- Abteilung Neurogenetik, Max-Planck-Institut für Experimentelle Medizin, Göttingen
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Zschüntzsch J, Hülsmann S, Schnell C, Dibaj P, Neusch C. Pharmacological modification of ATP-dependent microglial activation in a disease model of ALS. KLIN NEUROPHYSIOL 2010. [DOI: 10.1055/s-0030-1251013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Dibaj P, Steffens H, Zschüntzsch J, Schomburg ED, Kirchhoff F, Neusch C. Microglial contribution to neurodegeneration within the CNS and inflammation-independent degeneration within the PNS in the SOD1 (G93A) mouse model for ALS – a 2P-LSM study in vivo. KLIN NEUROPHYSIOL 2010. [DOI: 10.1055/s-0030-1250927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Dibaj P, Steffens H, Zschüntzsch J, Schomburg ED, Kirchhoff F, Neusch C. Entzündlich versus degenerativ, Zentralnervensystem versus peripheres Nervensystem – was können wir aus den aktuellen Erkenntnissen zur Pathogenese der amyotrophe Lateralsklerose für therapeutische Ansätze ableiten? Akt Neurol 2009. [DOI: 10.1055/s-0029-1238906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Zschüntzsch J, Dibaj P, Kötting J, Blaszczyk W, Neusch C. Eine neue Punktmutation im myelin protein zero (MPZ/P0) als Ursache einer schweren Ausprägung einer hereditären motorisch-sensiblen Neuropathie. Akt Neurol 2008. [DOI: 10.1055/s-0028-1086579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Tjan J, Zschüntzsch J, Dibaj P, Petri S, Kirchhoff F, Neusch C. Zellspezifische Expression von Maspardin in murinem und humanen postmortalen Rückenmark – Bedeutung für die hereditäre spastische Spinalparalyse 21. Akt Neurol 2008. [DOI: 10.1055/s-0028-1086534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ostertag K, Zschüntzsch J, Dibaj P, Petri S, Neusch C. Differentielle Expression von zwei P2-Purinorezeptoren (P2X4 und P2Y12) im Rückenmark und Vergleich mit dem SOD1-G93A-Mausmodell für ALS. Akt Neurol 2008. [DOI: 10.1055/s-0028-1086665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Neusch C, Zschüntzsch J, Kirchhoff F, Dibaj P. Pharmakologische Hemmung der Mikrogliareaktion bei der ALS – NO-Blockade als mögliche neue Therapiestrategie? Akt Neurol 2008. [DOI: 10.1055/s-0028-1086573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Neusch C, Zschüntzsch J, Dibaj P, Kirchhoff F. Dynamische 2-Photonenmikroskopie zur Untersuchung der Mikroglia-Aktivierung im SOD1-Mausmodell der ALS – Mikrogliahemmung als neuer Therapieansatz? Akt Neurol 2007. [DOI: 10.1055/s-2007-987587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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