Neurologische Klinik und Poliklinik
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Background
Fibromyalgia syndrome (FMS) is a chronic condition characterized by widespread pain and associated symptoms. We investigated cerebral activation in FMS patients by functional near-infrared spectroscopy (fNIRS).
Methods
Two stimulation paradigms were applied: a) painful pressure stimulation at the dorsal forearm; b) verbal fluency test (VFT). We prospectively recruited 25 FMS patients, ten patients with unipolar major depression (MD) without pain, and 35 healthy controls. All patients underwent neurological examination and all subjects were investigated with questionnaires (pain, depression, FMS, empathy).
Results
FMS patients had lower pressure pain thresholds than patients with MD and controls (p < 0.001) and reported higher pain intensity (p < 0.001). Upon unilateral pressure pain stimulation fNIRS recordings revealed increased bilateral cortical activation in FMS patients compared to controls (p < 0.05). FMS patients also displayed a stronger contralateral activity over the dorsolateral prefrontal cortex in direct comparison to patients with MD (p < 0.05). While all three groups performed equally well in the VFT, a frontal deficit in cortical activation was only found in patients with depression (p < 0.05). Performance and cortical activation correlated negatively in FMS patients (p < 0.05) and positively in patients with MD (p < 0.05).
Conclusion
Our data give further evidence for altered central nervous processing in patients with FMS and the distinction between FMS and MD.
To investigate the usefulness of pain-related evoked potentials (PREP) elicited by electrical stimulation for the identification of small fiber involvement in patients with mixed fiber neuropathy (MFN). Eleven MFN patients with clinical signs of large fiber impairment and neuropathic pain and ten healthy controls underwent clinical and electrophysiological evaluation. Small fiber function, electrical conductivity and morphology were examined by quantitative sensory testing (QST), PREP, and skin punch biopsy. MFN was diagnosed following clinical and electrophysiological examination (chronic inflammatory demyelinating neuropathy: n = 6; vasculitic neuropathy: n = 3; chronic axonal neuropathy: n = 2). The majority of patients with MFN characterized their pain by descriptors that mainly represent C-fiber-mediated pain. In QST, patients displayed elevated cold, warm, mechanical, and vibration detection thresholds and cold pain thresholds indicative of MFN. PREP amplitudes in patients correlated with cold (p < 0.05) and warm detection thresholds (p < 0.05). Burning pain and the presence of par-/dysesthesias correlated negatively with PREP amplitudes (p < 0.05). PREP amplitudes correlating with cold and warm detection thresholds, burning pain, and par-/dysesthesias support employing PREP amplitudes as an additional tool in conjunction with QST for detecting small fiber impairment in patients with MFN.
Die hier vorliegende Forschungsarbeit überprüfte eine mögliche Beteiligung des peripheren Nervensystems bei M. Parkinson und den atypischen Parkinson-Syndromen. 31 Patienten mit einem idiopathischen Parkinson-Syndrom (IPD-Patienten) und neun Patienten mit einem atypischen Parkinson-Syndrom (APD-Patienten) sowie 35 altersentsprechende Kontrollprobanden wurden zwischen 2011 und 2012 für diese Studie rekrutiert. Neben der Eigenanamnese und der neurologischen Untersuchung erhielten die Patienten eine Suralisneurographie zur Überprüfung der large fibers und eine Quantitative sensorische Testung (QST) zur Detektion einer möglichen Small-fiber-Dysfunktion. Die Vitamin-Bestimmung diente der Untersuchung möglicher Zusammenhänge zwischen der Levodopa-Therapie, eventuell daraus resultierenden Vitamin-Mangelzuständen und einer reduzierten intraepidermalen Nervenfaser-Dichte (IENF-Dichte) beim M. Parkinson. Für die histologische Auswertung der IENF-Dichte und der dermalen, myelinisierten Nervenfaserbündel (PGP 9.5- / MBP- Doppelfärbung) sowie für die immunohistochemische Untersuchung der Nervenfasersubtypen (anti-alpha-CGRP- und anti-Substanz P-Antikörper) wurden bei jedem Probanden vier Hautbiopsien von den Extremitäten und dem Körperstamm entnommen.
Sieben IPD-Patienten und ein Proband mit einem atypischen Parkinson-Syndrom wiesen ein vermindertes sensorisches Nervenaktionspotenzial (SNAP) in der Suralisneurographie auf. Dagegen war eine pathologisch reduzierte Nervenleitgeschwindigkeit nur bei einem IPD-Patienten nachweisbar. Auffällig war zudem eine negative Korrelation zwischen der Erkrankungsdauer und dem SNAP (Korrelationskoeffizient -0,367, p<0,03). In der Auswertung der Hautbiopsien konnte eine statistisch signifikante Reduktion der myelinisierten Bündel am Unterschenkel der IPD-Patienten festgestellt werden.
Bei zehn von 30 IPD-Patienten, jedoch bei keinem der Probanden mit einem atypischen Parkinson-Syndrom, konnte eine verminderte IENF-Dichte nachgewiesen werden. In der statistischen Überprüfung wurde außerdem am Unterschenkel ein signifikanter Unterschied zwischen den IPD-Patienten und der Kontrollkohorte sowie eine negative Korrelation zwischen der Krankheitsdauer und der IENF-Dichte (Korrelationskoeffizient -0,320, p<0,05) festgestellt. Die QST konnte dagegen keinen statistisch signifikanten Unterschied zwischen den einzelnen Kohorten aufzeigen.
Im Kontrast dazu fand sich eine längenunabhängige Reduktion der CGRP-positiven und der Substanz P-positiven IENF-Dichte bei den Patienten mit einem idiopathischen Parkinson-Syndrom. Bemerkenswert war zudem eine signifikante Verminderung der Substanz P-positiven intraepidermalen Nervenfasern am Oberschenkel und Rücken bei den APD-Patienten. Eine statistisch signifikante Abweichung der CGRP- und Substanz P-positiven Bündel konnte dagegen nicht festgestellt werden.
In der laborchemischen Untersuchung war ein Zusammenhang zwischen den bestimmten Vitamin-Spiegeln und der kumulativen Levodopa-Dosis sowie zwischen den Vitaminen und der IENF-Dichte lediglich bei dem Vitamin B6 nachweisbar.
Zusammengefasst erscheint eine Beteiligung des peripheren Nervensystems beim idiopathischen Parkinson als wahrscheinlich, wohingegen bei den atypischen Parkinson-Syndromen vor allem von einer zentralen Genese ausgegangen werden kann. Basierend auf den Ergebnissen der Suralisneurographie und der Bestimmung der myelinisierten Bündel erscheint eine krankheitsbedingte Large-fiber-Beeinträchtigung beim M.Parkinson möglich. Die nachgewiesene längenabhängige Small-fiber-Reduktion bei IPD-Patienten wird vermutlich durch eine axonale Transportstörung verursacht. Einen krankheitsbedingten Erklärungsansatz für die längenunabhängige Reduktion der CGRP-positiven und der Substanz P-positiven IENF-Dichte bei IPD-Patienten liefert der Nachweis von neurotoxischem α-Synuclein in den sensiblen Spinatganglien mit einem daraus resultierenden Untergang von sensorischen Nervenfasern. Aufgrund der geringen Anzahl an Parkinson-Patienten mit sensiblen Symptomen und dem fehlenden Nachweis eines statistisch signifikanten Unterschiedes in der QST liegt der Verdacht nahe, dass die ermittelte intraepidermale Nervenfaserreduktion der IPD-Patienten nicht stark genug ausgeprägt ist, um eine signifikante Abweichung der QST-Ergebnisse zu verursachen. Weiterhin konnte kein Zusammenhang zwischen der kumulativen Levodopa-Menge, den Vitaminen B12, Methylmalonsäure sowie Homocystein und dem Auftreten einer Nervenfaserverminderung nachgewiesen werden, was gegen eine iatrogene Beteiligung des peripheren Nervensystems als Nebenwirkung der Levodopa-Therapie spricht. Das idiopathische Parkinson-Syndrom geht mit einer Reduktion der kleinen Nervenfasern einher, welche vermutlich auf die Grunderkrankung selbst zurückzuführen ist. Die Untersuchung der Haut erscheint somit vielversprechend für die Erforschung der Pathogenese und für die Differentialdiagnostik des M. Parkinson.
Background
A new thromboembolic animal model showed beneficial effects of t-PA with an infarct volume reduction of 36.8% in swiss mice. Because knock-out animal experiments for stroke frequently used C57BL76 mice we evaluated t-PA effects in this mouse strain and measured infarct volume and vascular recanalisation in-vivo by using high-field 9.4 T MRI and a 1H surface cryo coil.
Methods
Clot formation was triggered by microinjection of murine thrombin into the right middle cerebral artery (MCA). Animals (n = 28) were treated with 10 mg/kg, 5 mg/kg or no tissue plasminogen activator (t-PA) 40 min after MCA occlusion. For MR-imaging a Bruker 9.4 T animal system with a 1H surface cryo probe was used and a T2-weighted RARE sequence, a diffusion weighted multishot EPI sequence and a 3D flow-compensated gradient echo TOF angiography were performed.
Results
The infarct volume in animals treated with t-PA was significantly reduced (0.67 ± 1.38 mm3 for 10 mg/kg and 10.9 ± 8.79 mm3 for 5 mg/kg vs. 19.76 ± 2.72 mm3 ; p < 0.001) compared to untreated mice. An additional group was reperfused with t-PA inside the MRI. Already ten minutes after beginning of t-PA treatment, reperfusion flow was re-established in the right MCA. However, signal intensity was lower than in the contralateral MCA. This reduction in cerebral blood flow was attenuated during the first 60 minutes after reperfusion. 24 h after MCA occlusion and reperfusion, no difference in signal intensity of the contralateral and ipsilateral MCAs was observed.
Conclusions
We confirm a t-Pa effect using this stroke model in the C57BL76 mouse strain and demonstrate a chronological sequence MRI imaging after t-PA using a 1H surface cryo coil in a 9.4 T MRI. This setting will allow testing of new thrombolytic strategies for stroke treatment in-vivo in C57BL76 knock-out mice.
INTRODUCTION: Tuberculous meningitis (TM) causes substantial morbidity and mortality in humans. Human TM has been known to be induced by bacteria from the Mycobacterium tuberculosis complex (MTBC), such as M. tuberculosis and M. bovis.
CASE PRESENTATION: We describe a case of meningitis treated with fosfomycin, which showed partial effectiveness in an 80-year-old patient. After a lethal myocardial infarction, M. caprae (MC) was identified in cerebrospinal fluid culture. This isolated acid-fast organism was first identified as MTBC by MTBC-specific PCR (16S rDNA-PCR). Furthermore, species-specific identification of the isolate was done by gyrB PCR-restriction fragment length polymorphism analysis of a part of gyrB DNA. Colony morphology of the isolated MC strain showed dysgonic growth on Lowenstein-Jensen medium. The strain was susceptible to pyrazinamide (PZA).
CONCLUSION: This isolated strain was convincingly identified as MC according to the phenotypic and genotypic characteristics and PZA sensitivity. This is the first report of MC causing TM.
Unlike other organs the nervous system is secluded from the rest of the organism by the blood brain barrier (BBB) or blood nerve barrier (BNB) preventing passive influx of fluids from the circulation. Similarly, leukocyte entry to the nervous system is tightly controlled. Breakdown of these barriers and cellular inflammation are hallmarks of inflammatory as well as ischemic neurological diseases and thus represent potential therapeutic targets. The spatiotemporal relationship between BBB/BNB disruption and leukocyte infiltration has been a matter of debate. We here review contrast-enhanced magnetic resonance imaging (MRI) as a non-invasive tool to depict barrier dysfunction and its relation to macrophage infiltration in the central and peripheral nervous system under pathological conditions. Novel experimental contrast agents like Gadofluorine M (Gf) allow more sensitive assessment of BBB dysfunction than conventional Gadolinium (Gd)-DTPA enhanced MRI. In addition, Gf facilitates visualization of functional and transient alterations of the BBB remote from lesions. Cellular contrast agents such as superparamagnetic iron oxide particles (SPIO) and perfluorocarbons enable assessment of leukocyte (mainly macrophage) infiltration by MR technology. Combined use of these MR contrast agents disclosed that leukocytes can enter the nervous system independent from a disturbance of the BBB, and vice versa, a dysfunctional BBB/BNB by itself is not sufficient to attract inflammatory cells from the circulation. We will illustrate these basic imaging findings in animal models of multiple sclerosis, cerebral ischemia, and traumatic nerve injury and review corresponding findings in patients.
Background. Missed or delayed detection of progressive neuronal damage after traumatic brain injury (TBI) may have negative impact on the outcome. We investigated whether routine follow-up CT is beneficial in sedated and mechanically ventilated trauma patients. Methods. The study design is a retrospective chart review. A routine follow-up cCT was performed 6 hours after the admission scan. We defined 2 groups of patients, group I: patients with equal or recurrent pathologies and group II: patients with new findings or progression of known pathologies. Results. A progression of intracranial injury was found in 63 patients (42%) and 18 patients (12%) had new findings in cCT 2 (group II). In group II a change in therapy was found in 44 out of 81 patients (54%). 55 patients with progression or new findings on the second cCT had no clinical signs of neurological deterioration. Of those 24 patients (44%) had therapeutic consequences due to the results of the follow-up cCT. Conclusion. We found new diagnosis or progression of intracranial pathology in 54% of the patients. In 54% of patients with new findings and progression of pathology, therapy was changed due to the results of follow-up cCT. In trauma patients who are sedated and ventilated for different reasons a routine follow-up CT is beneficial.
The pathogenic role of endogenous antibodies in a mouse model for Charcot-Marie-Tooth 1B neuropathy
(2015)
Charcot-Marie-Tooth (CMT) type 1 neuropathies are a genetically heterogeneous group of non-treatable inherited disorders affecting the peripheral nervous system that lead to sensory and motor dysfunction. Secondary low grade inflammation, implicating the innate and adaptive immune system, could previously be identified as a substantial disease modifier in two mouse models for CMT1, CMT1B and 1X, respectively. However, the exact mechanism how the adaptive immune system contributes to disease pathogenesis is not completely understood. Based on observations that the accumulation of endogenous antibodies to myelin components is important for rapid myelin clearance after nerve injury during Wallerian degeneration, a possibly similar mechanism was considered for endogenous antibodies as disease amplifier in mice heterozygously deficient for P0 (P0het), mimicking some typical features of CMT1B.
In this study an increased antibody deposition was detected in the affected peripheral nerves of P0het myelin mutant mice. By crossbreeding P0het mutants with mice specifically lacking B-lymphocytes, and therefore antibodies (JHD-/-), a decline of endoneurial macrophages together with a substantially ameliorated demyelination could be demonstrated in 6-month-old mutant mice. Moreover, reconstitution with murine IgGs reverted the neuropathic phenotype, substantiating that endogenous antibodies are potentially pathogenic at this early stage of disease. Unexpectedly, in 12-months-old P0het mutants, JHD deficiency resulted in disease aggravation accompanied by an increased inflammatory reaction and M2-polarized macrophage response.
These observations suggest that in a mouse model for CMT1B, the lack of endogenous antibodies has a dichotomous effect: ameliorating early macrophage-mediated demyelination, as opposed to increasing inflammatory reactions leading to disease aggravation at older ages.
Rett syndrome is an X-linked neurodevelopmental condition mainly characterized by loss of spoken language and a regression of purposeful hand use, with the development of distinctive hand stereotypies, and gait abnormalities. Gait initiation is the transition from quiet stance to steady-state condition of walking. The associated motor program seems to be centrally mediated and includes preparatory adjustments prior to any apparent voluntary movement of the lower limbs. Anticipatory postural adjustments contribute to postural stability and to create the propulsive forces necessary to reach steady-state gait at a predefined velocity and may be indicative of the effectiveness of the feedforward control of gait. In this study, we examined anticipatory postural adjustments associated with gait initiation in eleven girls with Rett syndrome and ten healthy subjects. Muscle activity (tibialis anterior and soleus muscles), ground reaction forces and body kinematic were recorded. Children with Rett syndrome showed a distinctive impairment in temporal organization of all phases of the anticipatory postural adjustments. The lack of appropriate temporal scaling resulted in a diminished impulse to move forward, documented by an impairment in several parameters describing the efficiency of gait start: length and velocity of the first step, magnitude and orientation of centre of pressure-centre of mass vector at the instant of (swing-)toe off. These findings were related to an abnormal muscular activation pattern mainly characterized by a disruption of the synergistic activity of antagonistic pairs of postural muscles. This study showed that girls with Rett syndrome lack accurate tuning of feedforward control of gait.
Background and Purpose
In animal models, von Willebrand factor (VWF) is involved in thrombus formation and propagation of ischemic stroke. However, the pathophysiological relevance of this molecule in humans, and its potential use as a biomarker for the risk and severity of ischemic stroke remains unclear. This study had two aims: to identify predictors of altered VWF levels and to examine whether VWF levels differ between acute cerebrovascular events and chronic cerebrovascular disease (CCD).
Methods
A case–control study was undertaken between 2010 and 2013 at our University clinic. In total, 116 patients with acute ischemic stroke (AIS) or transitory ischemic attack (TIA), 117 patients with CCD, and 104 healthy volunteers (HV) were included. Blood was taken at days 0, 1, and 3 in patients with AIS or TIA, and once in CCD patients and HV. VWF serum levels were measured and correlated with demographic and clinical parameters by multivariate linear regression and ANOVA.
Results
Patients with CCD (158±46%) had significantly higher VWF levels than HV (113±36%, P<0.001), but lower levels than AIS/TIA patients (200±95%, P<0.001). Age, sex, and stroke severity influenced VWF levels (P<0.05).
Conclusions
VWF levels differed across disease subtypes and patient characteristics. Our study confirms increased VWF levels as a risk factor for cerebrovascular disease and, moreover, suggests that it may represent a potential biomarker for stroke severity, warranting further investigation.
We investigated in vivo brain nicotinic acetylcholine receptor (nAChR) distribution in cognitively intact subjects with Parkinson's disease (PD) at an early stage of the disease. Fourteen patients and 13 healthy subjects were imaged with single photon emission computed tomography and the radiotracer 5-[(123)I]iodo-3-[2(S)-2-azetidinylmethoxy]pyridine ([(123)I]5IA). Patients were selected according to several criteria, including short duration of motor signs (<7 years) and normal scores at an extensive neuropsychological evaluation. In PD patients, nAChR density was significantly higher in the putamen, the insular cortex and the supplementary motor area and lower in the caudate nucleus, the orbitofrontal cortex, and the middle temporal gyrus. Disease duration positively correlated with nAChR density in the putamen ipsilateral (ρ = 0.56, p < 0.05) but not contralateral (ρ = 0.49, p = 0.07) to the clinically most affected hemibody. We observed, for the first time in vivo, higher nAChR density in brain regions of the motor and limbic basal ganglia circuits of subjects with PD. Our findings support the notion of an up-regulated cholinergic activity at the striatal and possibly cortical level in cognitively intact PD patients at an early stage of disease.
Traumatic brain injury (TBI) induces a strong inflammatory response which includes blood-brain barrier damage, edema formation and infiltration of different immune cell subsets. More recently, microvascular thrombosis has been identified as another pathophysiological feature of TBI. The contact-kinin system represents an interface between inflammatory and thrombotic circuits and is activated in different neurological diseases. C1-Inhibitor counteracts activation of the contact-kinin system at multiple levels. We investigated the therapeutic potential of C1-Inhibitor in a model of TBI. Male and female C57BL/6 mice were subjected to cortical cryolesion and treated with C1-Inhibitor after 1 h. Lesion volumes were assessed between day 1 and day 5 and blood-brain barrier damage, thrombus formation as well as the local inflammatory response were determined post TBI. Treatment of male mice with 15.0 IU C1-Inhibitor, but not 7.5 IU, 1 h after cryolesion reduced lesion volumes by ~75% on day 1. This protective effect was preserved in female mice and at later stages of trauma. Mechanistically, C1-Inhibitor stabilized the blood-brain barrier and decreased the invasion of immune cells into the brain parenchyma. Moreover, C1-Inhibitor had strong antithrombotic effects. C1-Inhibitor represents a multifaceted anti-inflammatory and antithrombotic compound that prevents traumatic neurodegeneration in clinically meaningful settings.
Traumatic brain injury (TBI) is a major cause of mortality and morbidity worldwide. Despite improvements in acute intensive care, there are currently no specific therapies to ameliorate the effects of TBI. Successful therapeutic strategies for TBI should target multiple pathophysiologic mechanisms that occur at different stages of brain injury. The kallikrein-kinin system is a promising therapeutic target for TBI as it mediates key pathologic events of traumatic brain damage, such as edema formation, inflammation, and thrombosis. Selective and specific kinin receptor antagonists and inhibitors of plasma kallikrein and coagulation factor XII have been developed, and have already shown therapeutic efficacy in animal models of stroke and TBI. However, conflicting preclinical evaluation, as well as limited and inconclusive data from clinical trials in TBI, suggests that caution should be taken before transferring observations made in animals to humans. This review summarizes current evidence on the pathologic significance of the kallikrein-kinin system during TBI in animal models and, where available, the experimental findings are compared with human data.
Background: Progressive Supranuclear Palsy (PSP) is a sporadic and progressive neurodegenerative disease which belongs to the family of tauopathies and involves both cortical and subcortical structures. No effective therapy is to date available.
Methods/design: Autologous bone marrow (BM) mesenchymal stem cells (MSC) from patients affected by different type of parkinsonisms have shown their ability to improve the dopaminergic function in preclinical and clinical models. It is also possible to isolate and expand MSC from the BM of PSP patients with the same proliferation rate and immuphenotypic profile as MSC from healthy donors. BM MSC can be efficiently delivered to the affected brain regions of PSP patients where they can exert their beneficial effects through different mechanisms including the secretion of neurotrophic factors. Here we propose a randomized, placebo-controlled, double-blind phase I clinical trial in patients affected by PSP with MSC delivered via intra-arterial injection.
Discussion: To our knowledge, this is the first clinical trial to be applied in a no-option parkinsonism that aims to test the safety and to exploit the properties of autologous mesenchymal stem cells in reducing disease progression. The study has been designed to test the safety of this " first-in-man" approach and to preliminarily explore its efficacy by excluding the placebo effect.
Trial registration: NCT01824121
FoxP3+Regulatory T Cells Determine Disease Severity in Rodent Models of Inflammatory Neuropathies
(2014)
Inflammatory neuropathies represent disabling human autoimmune disorders with considerable disease variability. Animal models provide insights into defined aspects of their disease pathogenesis. Forkhead box P3 (FoxP3)+ regulatory T lymphocytes (Treg) are anti-inflammatory cells that maintain immune tolerance and counteract tissue damage in a variety of immune-mediated disorders. Dysfunction or a reduced frequency of Tregs have been associated with different human autoimmune disorders. We here analyzed the functional relevance of Tregs in determining disease manifestation and severity in murine models of autoimmune neuropathies. We took advantage of the DEREG mouse system allowing depletion of Treg with high specificity as well as anti-CD25 directed antibodies to deplete Tregs in mice in actively induced experimental autoimmune neuritis (EAN). Furthermore antibody-depletion was performed in an adoptive transfer model of chronic neuritis. Early Treg depletion increased clinical EAN severity both in active and adoptive transfer chronic neuritis. This was accompanied by increased proliferation of myelin specific T cells and histological signs of peripheral nerve inflammation. Late stage Treg depletion after initial disease manifestation however did not exacerbate inflammatory neuropathy symptoms further. We conclude that Tregs determine disease severity in experimental autoimmune neuropathies during the initial priming phase, but have no major disease modifying function after disease manifestation. Potential future therapeutic approaches targeting Tregs should thus be performed early in inflammatory neuropathies.
Background: Persistent pain after inguinal herniorrhaphy is a disabling condition with a lack of evidence-based pharmacological treatment options. This randomized placebo-controlled trial investigated the efficacy of a capsaicin 8% cutaneous patch in the treatment of severe persistent inguinal postherniorrhaphy pain. Methods: Forty-six patients with persistent inguinal postherniorrhaphy pain were randomized to receive either a capsaicin 8% patch or a placebo patch. Pain intensity (Numerical Rating Scale [NRS 0-10]) was evaluated under standardized conditions (at rest, during movement, and during pressure) at baseline and at 1, 2 and 3 months after patch application. Skin punch biopsies for intraepidermal nerve fiber density (IENFD) measurements were taken at baseline and 1 month after patch application. Quantitative sensory testing was performed at baseline and at 1, 2, and 3 months after patch application. The primary outcome was comparisons of summed pain intensity differences (SPIDs) between capsaicin and placebo treatments at 1, 2 and 3 months after patch application (significance level P<0.01). Results: The maximum difference in SPID, between capsaicin and placebo treatments, was observed at 1 month after patch application, but the pain reduction was not significant (NRS, mean difference [95% CI]: 5.0 [0.09 to 9.9]; P=0.046). No differences in SPID between treatments were observed at 2 and 3 months after patch application. Changes in IENFD on the pain side, from baseline to 1 month after patch application, did not differ between capsaicin and placebo treatment: 1.9 [-0.1 to 3.9] and 0.6 [-1.2 to 2.5] fibers/mm, respectively (P=0.32). No significant changes in sensory function, sleep quality or psychological factors were associated with capsaicin patch treatment. Conclusions: The study did not demonstrate significant differences in pain relief between capsaicin and placebo treatment, although a trend toward pain improvement in capsaicin treated patients was observed 1 month after patch application.
Myelin formation during peripheral nervous system (PNS) development, and reformation after injury and in disease, requires multiple intrinsic and extrinsic signals. Akt/mTOR signaling has emerged as a major player involved, but the molecular mechanisms and downstream effectors are virtually unknown. Here, we have used Schwann-cell-specific conditional gene ablation of raptor and rictor, which encode essential components of the mTOR complexes 1 (mTORC1) and 2 (mTORC2), respectively, to demonstrate that mTORC1 controls PNS myelination during development. In this process, mTORC1 regulates lipid biosynthesis via sterol regulatory element-binding proteins (SREBPs). This course of action is mediated by the nuclear receptor RXRg, which transcriptionally regulates SREBP1c downstream of mTORC1. Absence of mTORC1 causes delayed myelination initiation as well as hypomyelination, together with abnormal lipid composition and decreased nerve conduction velocity. Thus, we have identified the mTORC1-RXR gamma-SREBP axis controlling lipid biosynthesis as a major contributor to proper peripheral nerve function.
Background: Patients presenting with bilateral trigeminal hypoesthesia may go on to have trigeminal isolated sensory neuropathy, a benign, purely trigeminal neuropathy, or facial-onset sensory motor neuronopathy (FOSMN), a malignant life-threatening condition. No diagnostic criteria can yet differentiate the two conditions at their onset. Nor is it clear whether the two diseases are distinct entities or share common pathophysiological mechanisms.
Methods: Seeking pathophysiological and diagnostic information to distinguish these two conditions at their onset, in this neurophysiological and morphometric study we neurophysiologically assessed function in myelinated and unmyelinated fibres and histologically examined supraorbital nerve biopsy specimens with optic and electron microscopy in 13 consecutive patients with recent onset trigeminal hypoesthesia and pain.
Results: The disease course distinctly differed in the 13 patients. During a mean 10 year follow-up whereas in eight patients the disease remained relatively stable, in the other five it progressed to possibly life-threatening motor disturbances and extra-trigeminal spread. From two to six years elapsed between the first sensory symptoms and the onset of motor disorders. In patients with trigeminal isolated sensory neuropathy (TISN) and in those with FOSMN neurophysiological and histological examination documented a neuronopathy manifesting with trigeminal nerve damage selectively affecting myelinated fibres, but sparing the Ia-fibre-mediated proprioceptive reflex.
Conclusions: Although no clinical diagnostic criteria can distinguish the two conditions at onset, neurophysiological and nerve-biopsy findings specify that in both disorders trigeminal nerve damage manifests as a dissociated neuronopathy affecting myelinated and sparing unmyelinated fibres, thus suggesting similar pathophysiological mechanisms.
Natalizumab ist ein humanisierter monoklonaler Antikörper gegen das Oberflächenadhäsionsmolekül Integrin α-4, der zur Therapie von schweren Verlaufsformen der Multiplen Sklerose (MS) zugelassen ist. Integrin α-4/β-1 wird durch Leukozyten exprimiert und steuert deren Extravasation über die Bindung an VCAM-1 (vascular cell adhesion molecule-1) auf Endothelzellen. Natalizumab wirkt über eine Blockade der Leukozytenadhäsion. In einigen Publikationen konnte darüber hinaus gezeigt werden, dass Integrin α-4 auch auf zerebralen Endothelzellen von Mäusen und Ratten exprimiert wird. In der vorliegenden Arbeit wurde die Expression und Funktion von Integrin α-4 in kultivierten primären humanen zerebralen Endothelzellen untersucht.
Die im Rahmen dieser Arbeit an verschiedenen Einzelspenderpräparationen durchgeführten FACS-Analysen zeigten, dass Integrin α-4 in unterschiedlicher Ausprägung auf primären zerebralen Endothelzellisolationen nachzuweisen war. Mit Hilfe immunzytochemischer Färbungen konnte ein spezifisches Verteilungsmuster des Integrin α-4 in Form eines feinen, granulären Musters im Bereich des Zellleibes dokumentiert werden.
In Adhäsionsversuchen zeigten Integrin α-4-exprimierende Endothelzellen nach Zugabe von Natalizumab in niedriger Konzentration eine verminderte Fähigkeit zur Haftung an Fibronectin, einem Bindungspartner in der extrazellulären Matrix. In hohen Konzentrationen dominierte im eingesetzten experimentellen System ein unspezifischer Blockadeeffekt, der auch mit Kontrollantikörpern zu beobachten war.
In MS-Läsionen findet sich auch die lösliche Form des VCAM-1 (sVCAM-1), die möglicherweise mit endothelialem Integrin α-4 interagiert. Daher wurde mit Hilfe von Western-Blot-Untersuchungen die intrazelluläre Signaltransduktion unter Stimulation mit sVCAM-1 untersucht. Es zeigte sich wie in anderen Endothelarten vorbeschrieben eine Aktivierung des p38-MAP-Kinase-Signalweges.
Zusammenfassend wurde demonstriert, dass primäre humane zerebrale Endothelzellen Integrin α-4 exprimieren und dass dieses wahrscheinlich nicht nur für die mechanische Verankerung in der Extrazellulärmatrix eine Bedeutung besitzt, sondern auch als Induktor intrazellulärer Signaltransduktion fungiert, welche die Schrankeneigenschaften zerebraler Endothelzellen beeinflussen könnte.
Background
Postherpetic neuralgia (PHN) is the painful complication of a varicella zoster virus reactivation. We investigated the systemic and local gene expression of pro- and anti-inflammatory cytokine expression in patients with PHN.
Methods
Thirteen patients with PHN at the torso (Th4-S1) were recruited. Skin punch biopsies were obtained from the painful and the contralateral painless body area for intraepidermal nerve fiber density (IENFD) and cytokine profiling. Additionally, blood was withdrawn for systemic cytokine expression and compared to blood values of healthy controls. We analyzed the gene expression of selected pro- and anti-inflammatory cytokines (tumor necrosis factor-alpha [TNF] and interleukins [IL]-1β, IL-2, and IL-8).
Results
IENFD was lower in affected skin compared to unaffected skin (p<0.05), while local gene expression of pro- and anti-inflammatory cytokines did not differ except for two patients who had 7fold higher IL-6 and 10fold higher IL-10 gene expression in the affected skin compared to the contralateral unaffected skin sample. Also, the systemic expression of cytokines in patients with PHN and in healthy controls was similar.
Conclusion
While the systemic and local expression of the investigated pro- and anti-inflammatory cytokines was not different from controls, this may have been influenced by study limitations like the low number of patients and different disease durations. Furthermore, other cytokines or pain mediators need to be considered.