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Borngräber M, Schlesinger F, Petri S, Dengler R, Krampfl K. ZK200775, ZK187638, ZK238519 and ZK166350: comparison of different potent antagonists of AMPA-type glutamate receptor channels and their potential role for neuroprotection. AKTUELLE NEUROLOGIE 2008. [DOI: 10.1055/s-0028-1086659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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227
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Mohammadi B, Kollewe K, Krampfl K, Samii A, Dengler R, Münte T. Changes in cortical and subcortical motor activity in early ALS studied with fMRI. AKTUELLE NEUROLOGIE 2008. [DOI: 10.1055/s-0028-1086660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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228
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Grosskreutz J, Peschel T, Unrath A, Dengler R, Ludolph AC, Kassubek J. Whole brain-based computerized neuroimaging in ALS and other motor neuron disorders. ACTA ACUST UNITED AC 2008; 9:238-48. [PMID: 18608107 DOI: 10.1080/17482960802163622] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Advanced neuroimaging applications to patients suffering from ALS and other motor neuron disorders (MND) have a high potential in terms of understanding the pathophysiology and visualizing the in vivo pathoanatomy of the diseases. In this context, particularly observer-independent computerized analyses of magnetic resonance imaging (MRI) data are of special interest since they overcome shortcomings of region-of-interest-based techniques. For three-dimensional structural T1-weighted MRI of the whole brain, voxel-based morphometry (VBM) has proven the most valuable approach to analyse regional volume alterations of the grey or white matter at group level. For the analysis of the white matter integrity with respect to tissue diffusivity and white matter connectivity including fibre tracking algorithms, diffusion tensor imaging (DTI) which can also be performed on a whole brain-basis is of the highest potential to date. Both VBM and DTI have been applied to various MND, in particular ALS, in multiple studies over recent years and have substantially broadened our knowledge about their in vivo pathoanatomy and mechanisms of neurodegeneration. Especially both the degree of damage to motor areas and the involvement of non-motor areas are of interest to be subjected to quantitative assessment, in order to establish quantitative surrogate markers for disease progression usable in clinical trials. Here, the technical state-of-the-art and the results of VBM and DTI studies in MND as the current state are reviewed, and future perspectives for further neuroimaging applications are highlighted.
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Haeseler G, Karst M, Foadi N, Gudehus S, Roeder A, Hecker H, Dengler R, Leuwer M. High-affinity blockade of voltage-operated skeletal muscle and neuronal sodium channels by halogenated propofol analogues. Br J Pharmacol 2008; 155:265-75. [PMID: 18574460 DOI: 10.1038/bjp.2008.255] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND AND PURPOSE Voltage-operated sodium channels constitute major target sites for local anaesthetic-like action. The clinical use of local anaesthetics is still limited by severe side effects, in particular, arrhythmias and convulsions. These side effects render the search for new local anaesthetics a matter of high interest. EXPERIMENTAL APPROACH We have investigated the effects of three halogenated structural analogues of propofol on voltage-operated human skeletal muscle sodium channels (Na(V)1.4) and the effect of one compound (4-chloropropofol) on neuronal sodium channels (Na(V)1.2) heterologously expressed in human embryonic kidney cell line 293. KEY RESULTS 4-Iodo-, 4-bromo- and 4-chloropropofol reversibly suppressed depolarization-induced whole-cell sodium inward currents with high potency. The IC(50) for block of resting channels at -150 mV was 2.3, 3.9 and 11.3 microM in Na(V)1.4, respectively, and 29.2 microM for 4-chloropropofol in Na(V)1.2. Membrane depolarization inducing inactivation strongly increased the blocking potency of all compounds. Estimated affinities for the fast-inactivated channel state were 81 nM, 312 nM and 227 nM for 4-iodopropofol, 4-bromopropofol and 4-chloropropofol in Na(V)1.4, and 450 nM for 4-chloropropofol in Na(V)1.2. Recovery from fast inactivation was prolonged in the presence of drug leading to an accumulation of block during repetitive stimulation at high frequencies (100 Hz). CONCLUSIONS AND IMPLICATIONS Halogenated propofol analogues constitute a novel class of sodium channel-blocking drugs possessing almost 100-fold higher potency compared with the local anaesthetic and anti-arrhythmic drug lidocaine. Preferential drug binding to inactivated channel states suggests that halogenated propofol analogues might be especially effective in suppressing ectopic discharges in a variety of pathological conditions.
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Jahn K, Schlesinger F, Jin LJ, Dengler R, Bufler J, Krampfl K. Molecular mechanisms of interaction between the neuroprotective substance riluzole and GABA(A)-receptors. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2008; 378:53-63. [PMID: 18458879 DOI: 10.1007/s00210-008-0290-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2008] [Accepted: 03/26/2008] [Indexed: 11/28/2022]
Abstract
The antiepileptic drug riluzole is used as a therapeutic agent in amyotrophic lateral sclerosis due to its neuroprotective effects. Besides presynaptic inhibition of GABAergic and preferentially glutamatergic transmission, it also potentiates postsynaptic GABA(A)-receptor function. We investigated the postsynaptic effects of riluzole on GABA(A)-receptor channels by use of the patch-clamp technique. Recombinant alpha1beta2gamma(2s) and alpha1beta2 GABA(A) receptors were expressed in HEK 293 cells by transient transfection. Pulses of GABA were applied in combination with different concentrations of riluzole to whole cell or outside-out patches with either alpha1beta2gamma(2s) or alpha1beta2 GABA(A)-receptor channels. Co-application of riluzole led to a slight decrease of absolute peak current amplitudes and steady-state currents in prolonged presence of GABA at saturating concentrations. In the presence of riluzole, enhancement of current amplitudes was observed with lower concentrations of GABA at alpha1beta2gamma(2s) receptors and to a lower extent also at alpha1beta2 receptors. Thus, the potentiating effect of riluzole was shown to be not abolished in the absence of the gamma(2s)-subunit. A further prominent effect of riluzole was a highly significant acceleration of the time course of current decay, most probably pointing to an open-channel block-like mechanism of action. As both receptor subtypes were affected similarly by the block, it could be concluded that the respective binding sites should be assumed within a region of high sequence homology like it is given for the channel-lining M2 domain of GABA(A)-receptor subunits. In conclusion, three different molecular mechanisms of interaction of the neuroprotective compound riluzole were observed at two different subtypes of GABA(A) receptor channels. The results further point to the impact of the inhibitory as well as the excitatory synaptic activity as a pharmacological target to counteract chronic excitotoxicity and reveal molecular mechanisms of action of the only one neuroprotective drug in current clinical use in patients suffering from amyotrophic lateral sclerosis.
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Nager W, Münte TF, Marco-Pallares J, Heldmann M, Dengler R, Capelle HH, Lütjens G, Krauss JK. MO10 Beta-oscillations in the posterior hypothalamus are associated with acute cluster headache attacks. Clin Neurophysiol 2008. [DOI: 10.1016/s1388-2457(08)60032-2] [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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232
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Nikolova Z, Moebes J, Arsic M, Dengler R, Schroeder C. P230 Processing of emotional prosody in patients with primary dystonia. Clin Neurophysiol 2008. [DOI: 10.1016/s1388-2457(08)60501-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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233
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Dengler R, Cassim F. The potential of transcranial magnetic stimulation (TMS) in studies of the motor function. Clin Neurophysiol 2008. [DOI: 10.1016/s1388-2457(08)60100-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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234
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Schrader C, Peschel T, Däuper J, Rollnik J, Dengler R, Kossev A. Changes in processing of proprioceptive information in Parkinson’s disease and multiple system atrophy. Clin Neurophysiol 2008; 119:1139-46. [DOI: 10.1016/j.clinph.2008.01.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2007] [Revised: 12/29/2007] [Accepted: 01/10/2008] [Indexed: 10/22/2022]
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235
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Arsic M, Schröder C, Lefik M, Wittfoth M, Dengler R, Möbes J. P192 Modulation of prosodic speech by repetitive transcranial stimulation. Clin Neurophysiol 2008. [DOI: 10.1016/s1388-2457(08)60463-0] [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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236
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Althaus A, Becker OA, Spottke A, Dengler R, Schneider F, Kloss M, Eggert K, Oertel WH, Dillmann U, Herting B, Classen J, Dodel R. Frequency and treatment of depressive symptoms in a Parkinson's disease registry. Parkinsonism Relat Disord 2008; 14:626-32. [PMID: 18406197 DOI: 10.1016/j.parkreldis.2008.01.016] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2007] [Revised: 01/25/2008] [Accepted: 01/25/2008] [Indexed: 02/02/2023]
Abstract
Purpose of this cross-sectional study was to estimate the occurrence of depressive symptoms, as related to other clinical data, in a sample of Parkinson's disease (PD) patients (n=226). Furthermore, we examined the medical care of depressive symptoms in this sample. H&Y stages, cognitive status, sleeping disorders, and dysphagia resulted as significant predictors for depression. Prevalence of depressive symptoms was 35.4%. Only 25.0% of patients suffering from moderate to severe depressive symptoms were prescribed antidepressants. This study supports the view that depression may be underrecognized and undertreated in PD patients. A significant proportion of patients continues to experience depressive symptoms despite antidepressive medication. Recognition and treatment of depression remains a challenge for management of PD. Possible coexisting depressive symptoms should be revealed and assessed by standardized interviews in everyday clinical routine. Large scale randomized controlled trials examining efficacy and safety of antidepressants in PD patients are urgently required.
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Bufler J, Dengler R. Editorial. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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238
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Staude G, Wolf W, Wierzbicka M, Oertel W, Dengler R. Die Abhängigkeit schneller willkürlicher Kontraktionen von der Tremorphase beim Parkinsonismus. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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239
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Tröger M, Dengler R. Neurophysiologische Diagnostik bei amyotropher Lateralsklerose. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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240
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Dengler R, Elek J, Hermans R, Wolf W. Doppelentladungen motorischer Einheiten und Tremorstärke. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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241
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Dengler R, Struppler A. Beurteilung der Lokalisation und Ausdehnung von Hirnstammaffektionen mit Hilfe des Orbicularis-oculi-Reflexes. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1061091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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242
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Dengler R, Stein R. Direkte Messung der Leitgeschwindigkeit einzelner motorischer Axone am Menschen. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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243
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Dengler R, Heinze HJ, Rappelsberger P, Ringelstein E, Speckmann EJ, Stöhr M, Wieser HG. Editorial. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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244
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Dengler R. Stand und Entwicklungen der modernen klinischen Elektromyographie. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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245
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Wohlfarth K, Dengler R, Kossev A, Elek J, Schubert M, Wolf W. Ist die F-Wellen-Entstehung abhängig von der Größe der motorischen Einheiten? KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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246
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Schubert M, Mills K, Boniface S, Konstanzer A, Dengler R. Veränderungen der Reizantworten motorischer Einheiten auf transkranielle Magnetstimulation bei Patienten mit multipler Sklerose und zerebralem Insult. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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247
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Dengler R, Rechl F, Struppler A. Überlegungen zur Funktion der frühen und späten Komponente des Blinkreflexes - Untersuchung des Entladungsverhaltens einzelner motorischer Einheiten. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1061039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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248
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Dengler R, Wolf W, Schubert M, Struppler A. Störungen der Entladungstätigkeit motorischer Einheiten beim Parkinsonismus. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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249
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Nikolova Z, Moebes J, Arsic M, Dengler R, Scroeder C. Processing of emotional prosody in patients with primary cervical dystonia. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1072917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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250
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Dethlefsen C, Edler B, Nogueira W, Buechner A, Muente T, Lenarz T, Dengler R, Nager W. Simulation of a cochlear implant device diminishes the electrophysiological auditory orienting reaction to speech. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1072919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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