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Lange F, Porath K, Sellmann T, Einsle A, Jaster R, Linnebacher M, Köhling R, Kirschstein T. Direct-Current Electrical Field Stimulation of Patient-Derived Colorectal Cancer Cells. Biology (Basel) 2023; 12:1032. [PMID: 37508461 PMCID: PMC10376471 DOI: 10.3390/biology12071032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 07/17/2023] [Accepted: 07/20/2023] [Indexed: 07/30/2023]
Abstract
Several cues for a directional migration of colorectal cancer cells were identified as being crucial in tumor progression. However, galvanotaxis, the directional migration in direct-current electrical fields, has not been investigated so far. Therefore, we asked whether direct-current electrical fields could be used to mobilize colorectal cancer cells along field vectors. For this purpose, five patient-derived low-passage cell lines were exposed to field strengths of 150-250 V/m in vitro, and migration along the field vectors was investigated. To further study the role of voltage-gated calcium channels on galvanotaxis and intracellular signaling pathways that are associated with migration of colorectal cancer cells, the cultures were exposed to selective inhibitors. In three out of five colorectal cancer cell lines, we found a preferred cathodal migration. The cellular integrity of the cells was not impaired by exposure of the cells to the selected field strengths. Galvanotaxis was sensitive to inhibition of voltage-gated calcium channels. Furthermore, signaling pathways such as AKT and MEK, but not STAT3, were also found to contribute to galvanotaxis in our in vitro model system. Overall, we identify electrical fields as an important contributor to the directional migration of colorectal cancer cells.
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Affiliation(s)
- Falko Lange
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany
| | - Katrin Porath
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany
| | - Tina Sellmann
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany
| | - Anne Einsle
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany
| | - Robert Jaster
- Division of Gastroenterology and Endocrinology, Department of Medicine II, Rostock University Medical Center, 18057 Rostock, Germany
| | - Michael Linnebacher
- Molecular Oncology and Immunotherapy, Clinic of General Surgery, Rostock University Medical Center, 18057 Rostock, Germany
| | - Rüdiger Köhling
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany
| | - Timo Kirschstein
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany
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Küpper M, Porath K, Sellmann T, Bien CG, Köhling R, Kirschstein T. GluN2B inhibition rescues impaired potentiation and epileptogenicity at associational-commissural CA3 synapses in a model of anti-NMDAR encephalitis. Neurosci Lett 2023; 795:137031. [PMID: 36574811 DOI: 10.1016/j.neulet.2022.137031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 12/21/2022] [Accepted: 12/21/2022] [Indexed: 12/25/2022]
Abstract
Anti-N-methyl-d-aspartate receptor (anti-NMDAR) encephalitis is an autoimmune epilepsy associated with memory deficits. Research has demonstrated that anti-NMDAR inhibit long-term potentiation, and, at the same time, lead to disinhibition in the form of epileptiform afterpotentials in the potentiated state. While both effects may give rise to the key symptoms of the disease, the molecular basis of being simultaneously inhibitory and disinhibitory is difficult to explain. Here, we explored a possible involvement of the GluN2B subunit. To this aim, we injected cerebrospinal fluid from anti-NMDAR encephalitis patients into the rat hippocampus and prepared brain slices for in vitro field potential recordings. Associational-commissural-fiber-CA3 synapses from anti-NMDAR-treated animals showed increased field potential amplitudes with concomitantly enhanced paired-pulse ratios as compared to control tissue. GluN2B inhibition by Ro25-6981 mimicked these effects in controls but had no effect in anti-NMDAR tissues indicating a presynaptic and occluding effect of anti-NMDAR. We then induced potentiation of associational-commissural-fiber-CA3 synapses, and confirmed that slices from anti-NMDAR-treated animals showed reduced potentiation and pronounced epileptiform afterpotentials. Intriguingly, both effects were absent when Ro25-6981 was added in vitro before inducing potentiation. These results indicate that GluN2B-containing NMDARs, partially expressed presynaptically, show differential sensitivity to anti-NMDAR, and that altered GluN2B function is particularly apparent in the potentiated state rather than under baseline conditions. Since GluN2B inhibition rescued the effects of anti-NMDAR in the potentiated state, this opens the possibility that at least a subgroup of patients could benefit from a GluN2B antagonist.
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Affiliation(s)
- Maraike Küpper
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - Katrin Porath
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - Tina Sellmann
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - Christian G Bien
- Department of Epileptology (Krankenhaus Mara), Bielefeld University, Medical School, Bielefeld, Germany
| | - Rüdiger Köhling
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany; Center of Transdisciplinary Neurosciences Rostock (CTNR), University of Rostock, Germany
| | - Timo Kirschstein
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany; Center of Transdisciplinary Neurosciences Rostock (CTNR), University of Rostock, Germany.
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Dawson JE, Sellmann T, Porath K, Bader R, van Rienen U, Appali R, Köhling R. Cell-cell interactions and fluctuations in the direction of motility promote directed migration of osteoblasts in direct current electrotaxis. Front Bioeng Biotechnol 2022; 10:995326. [PMID: 36277406 PMCID: PMC9582662 DOI: 10.3389/fbioe.2022.995326] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 09/20/2022] [Indexed: 11/13/2022] Open
Abstract
Under both physiological (development, regeneration) and pathological conditions (cancer metastasis), cells migrate while sensing environmental cues in the form of mechanical, chemical or electrical stimuli. In the case of bone tissue, osteoblast migration is essential in bone regeneration. Although it is known that osteoblasts respond to exogenous electric fields, the underlying mechanism of electrotactic collective movement of human osteoblasts is unclear. Here, we present a computational model that describes the osteoblast cell migration in a direct current electric field as the motion of a collection of active self-propelled particles and takes into account fluctuations in the direction of single-cell migration, finite-range cell-cell interactions, and the interaction of a cell with the external electric field. By comparing this model with in vitro experiments in which human primary osteoblasts are exposed to a direct current electric field of different field strengths, we show that cell-cell interactions and fluctuations in the migration direction promote anode-directed collective migration of osteoblasts.
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Affiliation(s)
- Jonathan Edward Dawson
- Institute of General Electrical Engineering, University of Rostock, Rostock, Germany
- Department of Chemistry and Physics, Augusta University, Augusta, GA, United States
- *Correspondence: Jonathan Edward Dawson, ; Rüdiger Köhling,
| | - Tina Sellmann
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Katrin Porath
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Rainer Bader
- Department of Life, Light and Matter, Interdisciplinary Faculty, University of Rostock, Rostock, Germany
- Biomechanics and Implant Research Lab, Department of Orthopedics, Rostock University Medical Center, Rostock, Germany
| | - Ursula van Rienen
- Institute of General Electrical Engineering, University of Rostock, Rostock, Germany
- Department of Life, Light and Matter, Interdisciplinary Faculty, University of Rostock, Rostock, Germany
- Department of Ageing of Individuals and Society, Interdisciplinary Faculty, University of Rostock, Rostock, Germany
| | - Revathi Appali
- Institute of General Electrical Engineering, University of Rostock, Rostock, Germany
- Department of Ageing of Individuals and Society, Interdisciplinary Faculty, University of Rostock, Rostock, Germany
| | - Rüdiger Köhling
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
- Department of Ageing of Individuals and Society, Interdisciplinary Faculty, University of Rostock, Rostock, Germany
- Center for Translational Neuroscience Research, Rostock University Medical Center, Rostock, Germany
- *Correspondence: Jonathan Edward Dawson, ; Rüdiger Köhling,
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Lange F, Venus J, Shams Esfand Abady D, Porath K, Einsle A, Sellmann T, Neubert V, Reichart G, Linnebacher M, Köhling R, Kirschstein T. Galvanotactic Migration of Glioblastoma and Brain Metastases Cells. Life (Basel) 2022; 12:life12040580. [PMID: 35455071 PMCID: PMC9027426 DOI: 10.3390/life12040580] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/11/2022] [Accepted: 04/11/2022] [Indexed: 12/27/2022] Open
Abstract
Galvanotaxis, the migration along direct current electrical fields, may contribute to the invasion of brain cancer cells in the tumor-surrounding tissue. We hypothesized that pharmacological perturbation of the epidermal growth factor (EGF) receptor and downstream phosphatidylinositol 3-kinase (PI3K)/AKT pathway prevent galvanotactic migration. In our study, patient-derived glioblastoma and brain metastases cells were exposed to direct current electrical field conditions. Velocity and direction of migration were estimated. To determine the effects of EGF receptor antagonist afatinib and AKT inhibitor capivasertib, assays of cell proliferation, apoptosis and immunoblot analyses were performed. Both inhibitors attenuated cell proliferation in a dose-dependent manner and induced apoptosis. We found that most of the glioblastoma cells migrated preferentially in an anodal direction, while brain metastases cells were unaffected by direct current stimulations. Afatinib presented only a mild attenuation of galvanotaxis. In contrast, capivasertib abolished the migration of glioblastoma cells without genetic alterations in the PI3K/AKT pathway, but not in cells harboring PTEN mutation. In these cells, an increase in the activation of ERK1/2 may in part substitute the inhibition of the AKT pathway. Overall, our data demonstrate that glioblastoma cells migrate in the electrical field and the PI3K/AKT pathway was found to be highly involved in galvanotaxis.
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Affiliation(s)
- Falko Lange
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany; (J.V.); (D.S.E.A.); (K.P.); (A.E.); (T.S.); (V.N.); (G.R.); (R.K.); (T.K.)
- Center for Transdisciplinary Neurosciences Rostock, University of Rostock, 18147 Rostock, Germany
- Correspondence:
| | - Jakob Venus
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany; (J.V.); (D.S.E.A.); (K.P.); (A.E.); (T.S.); (V.N.); (G.R.); (R.K.); (T.K.)
| | - Daria Shams Esfand Abady
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany; (J.V.); (D.S.E.A.); (K.P.); (A.E.); (T.S.); (V.N.); (G.R.); (R.K.); (T.K.)
| | - Katrin Porath
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany; (J.V.); (D.S.E.A.); (K.P.); (A.E.); (T.S.); (V.N.); (G.R.); (R.K.); (T.K.)
| | - Anne Einsle
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany; (J.V.); (D.S.E.A.); (K.P.); (A.E.); (T.S.); (V.N.); (G.R.); (R.K.); (T.K.)
| | - Tina Sellmann
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany; (J.V.); (D.S.E.A.); (K.P.); (A.E.); (T.S.); (V.N.); (G.R.); (R.K.); (T.K.)
| | - Valentin Neubert
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany; (J.V.); (D.S.E.A.); (K.P.); (A.E.); (T.S.); (V.N.); (G.R.); (R.K.); (T.K.)
| | - Gesine Reichart
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany; (J.V.); (D.S.E.A.); (K.P.); (A.E.); (T.S.); (V.N.); (G.R.); (R.K.); (T.K.)
| | - Michael Linnebacher
- Molecular Oncology and Immunotherapy, Rostock University Medical Center, 18057 Rostock, Germany;
| | - Rüdiger Köhling
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany; (J.V.); (D.S.E.A.); (K.P.); (A.E.); (T.S.); (V.N.); (G.R.); (R.K.); (T.K.)
- Center for Transdisciplinary Neurosciences Rostock, University of Rostock, 18147 Rostock, Germany
| | - Timo Kirschstein
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, 18057 Rostock, Germany; (J.V.); (D.S.E.A.); (K.P.); (A.E.); (T.S.); (V.N.); (G.R.); (R.K.); (T.K.)
- Center for Transdisciplinary Neurosciences Rostock, University of Rostock, 18147 Rostock, Germany
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Wittstock M, Kästner M, Kolbaske S, Sellmann T, Porath K, Patejdl R. Serial Measurements of Refractive Index, Glucose and Protein to Assess Gastric Liquid Nutrient Transport—A Proof-of-Principal Study. Front Nutr 2022; 8:742656. [PMID: 35187015 PMCID: PMC8850719 DOI: 10.3389/fnut.2021.742656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 12/29/2021] [Indexed: 11/22/2022] Open
Abstract
Delayed gastric emptying contributes to complications as aspiration or malnutrition. Among patients suffering from acute neurological diseases, motility disorders are prevalent but poorly understood. Thus, methods to measure gastric emptying are required to allow for appropriate adaptions of individual enteral nutrition algorithms. For enterally fed patients repetitive concentration measurements of gastric content have been proposed to assess gastric emptying. This approach can be used to calculate the gastric residual volume (GRV) and transport of nutrition formula (NF), but it has not yet been implemented in clinical routine. The aim of this study was to investigate whether refractometry or other likewise straightforward analytical approaches produce the best results under in vitro conditions mimicking the gastric milieu. We measured NF in different known concentrations, either diluted in water or in simulated gastric fluid (SGF), with each of the following methods: refractometer, handheld glucose meter, and Bradford protein assay. Then, in enterally fed patients suffering from acute neurological disease, we calculated GRVs and nutrition transport and tested possible associations with clinical parameters. In water dilution experiments, NF concentrations could be assessed with the readout parameters of all three methods. Refractometry yielded the most precise results over the broadest range of concentrations and was biased least by the presence of SGF (detection range for Fresubin original fibre, given as volume concentration/normalized error of regression slope after incubation with water or SGF: 0–100 vs. 0–100%/0.5 vs. 3.9%; glucose-measurement: 5–100 vs. 25–100%/7.9 vs. 6.1%; Bradford-assay: 0–100 vs. 0–100%/7.8 vs. 15.7%). Out of 28 enterally fed patients, we calculated significant slower nutrition transport in patients with higher blood glucose (Rho −0.391; p = 0.039) and in patients who received high-dose sufentanil (Rho −0.514; p = 0.005). Also, the calculated nutrition transport could distinguish patients with and without feeding intolerance (Median 6 vs. 17 ml/h; Mann-Whitney test: p = 0.002). The results of our study prove that serial refractometry is a suitable and cost-effective method to assess gastric emptying and to enhance research on gastrointestinal complications of stroke.
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Affiliation(s)
- Matthias Wittstock
- Department of Neurology, University Medical Center Rostock, Rostock, Germany
| | - Matthias Kästner
- Department of Neurology, University Medical Center Rostock, Rostock, Germany
| | - Stephan Kolbaske
- Department of Neurology, University Medical Center Rostock, Rostock, Germany
| | - Tina Sellmann
- Oscar Langendorff Institute of Physiology, University Medical Center Rostock, Rostock, Germany
| | - Katrin Porath
- Oscar Langendorff Institute of Physiology, University Medical Center Rostock, Rostock, Germany
| | - Robert Patejdl
- Oscar Langendorff Institute of Physiology, University Medical Center Rostock, Rostock, Germany
- *Correspondence: Robert Patejdl
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Patejdl R, Klawitter F, Walter U, Zanaty K, Schwandner F, Sellmann T, Porath K, Ehler J. A novel ex vivo model for critical illness neuromyopathy using freshly resected human colon smooth muscle. Sci Rep 2021; 11:24249. [PMID: 34930954 PMCID: PMC8688412 DOI: 10.1038/s41598-021-03711-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 12/02/2021] [Indexed: 01/15/2023] Open
Abstract
Patients suffering from critical illness are at risk to develop critical illness neuromyopathy (CINM). The underlying pathophysiology is complex and controversial. A central question is whether soluble serum factors are involved in the pathogenesis of CINM. In this study, smooth muscle preparations obtained from the colon of patients undergoing elective surgery were used to investigate the effects of serum from critically ill patients. At the time of blood draw, CINM was assessed by clinical rating and electrophysiology. Muscle strips were incubated with serum of healthy controls or patients in organ baths and isometric force was measured. Fifteen samples from healthy controls and 98 from patients were studied. Ratios of responses to electric field stimulation (EFS) before and after incubation were 118% for serum from controls and 51% and 62% with serum from critically ill patients obtained at day 3 and 10 of critical illness, respectively (p = 0.003, One-Way-ANOVA). Responses to carbachol and high-K+ were equal between these groups. Ratios of post/pre-EFS responses correlated with less severe CINM. These results support the existence of pathogenic, i.e. neurotoxic factors in the serum of critically ill patients. Using human colon smooth muscle as a bioassay may facilitate their future molecular identification.
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Affiliation(s)
- Robert Patejdl
- Oscar Langendorff Institute of Physiology, Rostock University Medical Center, Gertrudenstraße 9, 18057, Rostock, Germany.
| | - Felix Klawitter
- Department of Anesthesiology and Intensive Care Medicine, Rostock University Medical Center, Rostock, Germany
| | - Uwe Walter
- Department of Neurology, Rostock University Medical Center, Rostock, Germany
| | - Karim Zanaty
- Oscar Langendorff Institute of Physiology, Rostock University Medical Center, Gertrudenstraße 9, 18057, Rostock, Germany
| | - Frank Schwandner
- Department of General, Thoracic, Vascular and Transplantation Surgery, Rostock University Medical Center, Rostock, Germany
| | - Tina Sellmann
- Oscar Langendorff Institute of Physiology, Rostock University Medical Center, Gertrudenstraße 9, 18057, Rostock, Germany
| | - Katrin Porath
- Oscar Langendorff Institute of Physiology, Rostock University Medical Center, Gertrudenstraße 9, 18057, Rostock, Germany
| | - Johannes Ehler
- Department of Anesthesiology and Intensive Care Medicine, Rostock University Medical Center, Rostock, Germany
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Lange F, Hartung J, Liebelt C, Boisserée J, Resch T, Porath K, Hörnschemeyer J, Reichart G, Sellmann T, Neubert V, Kriesen S, Hildebrandt G, Schültke E, Köhling R, Kirschstein T. Perampanel Add-on to Standard Radiochemotherapy in vivo Promotes Neuroprotection in a Rodent F98 Glioma Model. Front Neurosci 2020; 14:598266. [PMID: 33328869 PMCID: PMC7734300 DOI: 10.3389/fnins.2020.598266] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 11/10/2020] [Indexed: 01/02/2023] Open
Abstract
An abnormal glutamate signaling of glioblastoma may contribute to both tumor progression and the generation of glioma-associated epileptic seizures. We hypothesized that the AMPA receptor antagonist perampanel (PER) could attenuate tumor growth and epileptic events. F98 glioma cells, grown orthotopically in Fischer rats, were employed as a model of glioma to investigate the therapeutic efficiency of PER (15 mg/kg) as adjuvant to standard radiochemotherapy (RCT). The epileptiform phenotype was investigated by video-EEG analysis and field potential recordings. Effects on glioma progression were estimated by tumor size quantification, survival analysis and immunohistological staining. Our data revealed that orthotopically-growing F98 glioma promote an epileptiform phenotype in rats. RCT reduced the tumor size and prolonged the survival of the animals. The adjuvant administration of PER had no effect on tumor progression. The tumor-associated epileptic events were abolished by PER application or RCT respectively, to initial baseline levels. Remarkably, PER preserved the glutamatergic network activity on healthy peritumoral tissue in RCT-treated animals. F98 tumors are not only a robust model to investigate glioma progression, but also a viable model to simulate a glioma-associated epileptiform phenotype. Furthermore, our data indicate that PER acts as a potent anticonvulsant and may protect the tumor-surrounding tissue as adjuvant to RCT, but failed to attenuate tumor growth or promote animal survival.
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Affiliation(s)
- Falko Lange
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany.,Center for Transdisciplinary Neurosciences Rostock, University of Rostock, Rostock, Germany
| | - Jens Hartung
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Clara Liebelt
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Julius Boisserée
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Tobias Resch
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Katrin Porath
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Julia Hörnschemeyer
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Gesine Reichart
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Tina Sellmann
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Valentin Neubert
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany
| | - Stephan Kriesen
- Department of Radiotherapy and Radiation Oncology, Rostock University Medical Center, Rostock, Germany
| | - Guido Hildebrandt
- Department of Radiotherapy and Radiation Oncology, Rostock University Medical Center, Rostock, Germany
| | - Elisabeth Schültke
- Department of Radiotherapy and Radiation Oncology, Rostock University Medical Center, Rostock, Germany
| | - Rüdiger Köhling
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany.,Center for Transdisciplinary Neurosciences Rostock, University of Rostock, Rostock, Germany
| | - Timo Kirschstein
- Oscar-Langendorff-Institute of Physiology, Rostock University Medical Center, Rostock, Germany.,Center for Transdisciplinary Neurosciences Rostock, University of Rostock, Rostock, Germany
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Kirschstein T, Sadkiewicz E, Hund-Göschel G, Becker J, Guli X, Müller S, Rohde M, Hübner DC, Brehme H, Kolbaske S, Porath K, Sellmann T, Großmann A, Wittstock M, Syrbe S, Storch A, Köhling R. Stereotactically Injected Kv1.2 and CASPR2 Antisera Cause Differential Effects on CA1 Synaptic and Cellular Excitability, but Both Enhance the Vulnerability to Pro-epileptic Conditions. Front Synaptic Neurosci 2020; 12:13. [PMID: 32269520 PMCID: PMC7110982 DOI: 10.3389/fnsyn.2020.00013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 03/06/2020] [Indexed: 12/12/2022] Open
Abstract
PURPOSE We present a case of voltage-gated potassium channel (VGKC) complex antibody-positive limbic encephalitis (LE) harboring autoantibodies against Kv1.2. Since the patient responded well to immunotherapy, the autoantibodies were regarded as pathogenic. We aimed to characterize the pathophysiological role of this antibody in comparison to an antibody against the VGKC-associated protein contactin-associated protein-2 (CASPR2). METHODS Stereotactic injection of patient sera (anti-Kv1.2-associated LE or anti-CASPR2 encephalopathy) and a control subject was performed into the hippocampus of the anesthetized rat in vivo, and hippocampal slices were prepared for electrophysiological purposes. Using extra- and intracellular techniques, synaptic transmission, long-term potentiation (LTP) and vulnerability to pro-epileptic conditions were analyzed. RESULTS We observed that the slope of the field excitatory postsynaptic potential (fEPSP) was significantly increased at Schaffer collateral-CA1 synapses in anti-Kv1.2-treated and anti-CASPR2-treated rats, but not at medial perforant path-dentate gyrus synapses. The increase of the fEPSP slope in CA1 was accompanied by a decrease of the paired-pulse ratio in anti-Kv1.2, but not in anti-CASPR2 tissue, indicating presynaptic site of anti-Kv1.2. In addition, anti-Kv1.2 tissue showed enhanced LTP in CA1, but dentate gyrus LTP remained unaltered. Importantly, LTP in slices from anti-CASPR2-treated animals did not differ from control values. Intracellular recordings from CA1 neurons revealed that the resting membrane potential and a single action potential were not different between anti-Kv1.2 and control tissue. However, when the depolarization was prolonged, the number of action potentials elicited was reduced in anti-Kv1.2-treated tissue compared to both control and anti-CASPR2 tissue. In contrast, polyspike discharges induced by removal of Mg2+ occurred earlier and more frequently in both patient sera compared to control. CONCLUSION Patient serum containing anti-Kv1.2 facilitates presynaptic transmitter release as well as postsynaptic depolarization at the Schaffer-collateral-CA1 synapse, but not in the dentate gyrus. As a consequence, both synaptic transmission and LTP in CA1 are facilitated and action potential firing is altered. In contrast, anti-CASPR2 leads to increased postsynaptic potentials, but without changing LTP or firing properties suggesting that anti-Kv1.2 and anti-CASPR2 differ in their cellular effects. Both patient sera alter susceptibility to epileptic conditions, but presumably by different mechanisms.
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Affiliation(s)
- Timo Kirschstein
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
- Department of Neurology, University of Rostock, Rostock, Germany
- Center of Transdisciplinary Neurosciences Rostock, University of Rostock, Rostock, Germany
| | - Erika Sadkiewicz
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Gerda Hund-Göschel
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Juliane Becker
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Xiati Guli
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Steffen Müller
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Marco Rohde
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | | | - Hannes Brehme
- Department of Neurology, University of Rostock, Rostock, Germany
| | - Stephan Kolbaske
- Department of Neurology, University of Rostock, Rostock, Germany
| | - Katrin Porath
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Tina Sellmann
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Annette Großmann
- Institute of Diagnostic and Intervention Radiology, University of Rostock, Rostock, Germany
| | | | - Steffen Syrbe
- Clinik for Pediatric and Adolescent Medicine, University of Heidelberg, Heidelberg, Germany
| | - Alexander Storch
- Department of Neurology, University of Rostock, Rostock, Germany
- Center of Transdisciplinary Neurosciences Rostock, University of Rostock, Rostock, Germany
| | - Rüdiger Köhling
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
- Center of Transdisciplinary Neurosciences Rostock, University of Rostock, Rostock, Germany
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9
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Rohde M, Ziebart J, Kirschstein T, Sellmann T, Porath K, Kühl F, Delenda B, Bahls C, van Rienen U, Bader R, Köhling R. Human Osteoblast Migration in DC Electrical Fields Depends on Store Operated Ca 2+-Release and Is Correlated to Upregulation of Stretch-Activated TRPM7 Channels. Front Bioeng Biotechnol 2019; 7:422. [PMID: 31921825 PMCID: PMC6920109 DOI: 10.3389/fbioe.2019.00422] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 11/29/2019] [Indexed: 12/04/2022] Open
Abstract
Fracture healing and bone regeneration, particularly in the elderly, remains a challenge. There is an ongoing search for methods to activate osteoblasts, and the application of electrical fields is an attractive approach in this context. Although it is known that such electromagnetic fields lead to osteoblast migration and foster mesenchymal osteogenic differentiation, so far the mechanisms of osteoblast activation remain unclear. Possible mechanisms could rely on changes in Ca2+-influx via ion channels, as these are known to modulate osteoblast activity, e.g., via voltage-sensitive, stretch-sensitive, transient-receptor-potential (TRP) channels, or store-operated release. In the present in vitro study, we explored whether electrical fields are able to modulate the expression of voltage-sensitive calcium channels as well as TRP channels in primary human osteoblast cell lines. We show migration speed is significantly increased in stimulated osteoblasts (6.4 ± 2.1 μm/h stimulated, 3.6 ± 1.1 μm/h control), and directed toward the anode. However, within a range of 154–445 V/m, field strength did not correlate with migration velocity. Neither was there a correlation between electric field and voltage-gated calcium channel (Cav3.2 and Cav1.4) expression. However, the expression of TRPM7 significantly correlated positively to electric field strength. TRPM7 channel blockade using NS8593, in turn, did not significantly alter migration speed, nor did blockade of Cav3.2 and Cav1.4 channels using Ni+ or verapamil, respectively, while a general Ca2+-influx block using Mg2+ accelerated migration. Stimulating store-operated Ca2+-release significantly reduced migration speed, while blocking IP3 had only a minor effect (at low and high concentrations of 2-APB, respectively). We conclude that (i) store operated channels negatively modulate migration speed and that (ii) the upregulation of TRPM7 might constitute a compensatory mechanism-which might explain how increasing expression levels at increasing field strengths result in constant migration speeds.
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Affiliation(s)
- Marco Rohde
- Rostock University Medical Center, Oscar-Langendorff-Institute of Physiology, Rostock, Germany
| | - Josefin Ziebart
- Biomechanics and Implant Research Lab, Department of Orthopedics, Rostock University Medical Center, Rostock, Germany
| | - Timo Kirschstein
- Rostock University Medical Center, Oscar-Langendorff-Institute of Physiology, Rostock, Germany
| | - Tina Sellmann
- Rostock University Medical Center, Oscar-Langendorff-Institute of Physiology, Rostock, Germany
| | - Katrin Porath
- Rostock University Medical Center, Oscar-Langendorff-Institute of Physiology, Rostock, Germany
| | - Friederike Kühl
- Rostock University Medical Center, Oscar-Langendorff-Institute of Physiology, Rostock, Germany
| | - Bachir Delenda
- Faculty of Computer Science and Electrical Engineering, Institute of General Electrical Engineering, University of Rostock, Rostock, Germany
| | - Christian Bahls
- Faculty of Computer Science and Electrical Engineering, Institute of General Electrical Engineering, University of Rostock, Rostock, Germany
| | - Ursula van Rienen
- Faculty of Computer Science and Electrical Engineering, Institute of General Electrical Engineering, University of Rostock, Rostock, Germany.,Interdisciplinary Faculty, University of Rostock, Rostock, Germany
| | - Rainer Bader
- Biomechanics and Implant Research Lab, Department of Orthopedics, Rostock University Medical Center, Rostock, Germany.,Interdisciplinary Faculty, University of Rostock, Rostock, Germany
| | - Rüdiger Köhling
- Rostock University Medical Center, Oscar-Langendorff-Institute of Physiology, Rostock, Germany.,Interdisciplinary Faculty, University of Rostock, Rostock, Germany
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10
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Kersten M, Rabbe T, Blome R, Porath K, Sellmann T, Bien CG, Köhling R, Kirschstein T. Novel Object Recognition in Rats With NMDAR Dysfunction in CA1 After Stereotactic Injection of Anti-NMDAR Encephalitis Cerebrospinal Fluid. Front Neurol 2019; 10:586. [PMID: 31231304 PMCID: PMC6560222 DOI: 10.3389/fneur.2019.00586] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2018] [Accepted: 05/17/2019] [Indexed: 12/13/2022] Open
Abstract
Purpose: Limbic encephalitis associated with autoantibodies against N-methyl D-aspartate receptors (NMDARs) often presents with memory impairment. NMDARs are key targets for memory acquisition and retrieval, and have been mechanistically linked to its underlying process, synaptic plasticity. Clinically, memory deficits are largely compatible with a pre-dominantly hippocampus-dependent phenotype, which, in rodents, is principally involved in spatial memory. Previous studies confirmed the impaired spatial memory in the rat model of anti-NMDAR encephalitis. Here, we hypothesized that non-spatial memory functions, such as object recognition might also be affected in this model. Methods: We performed stereotactic intrahippocampal bolus injection of human cerebrospinal fluid (CSF) from anti-NMDAR encephalitis and control patients into the hippocampus of the anesthetized rat. After recovery for 1–8 days, hippocampal slices were prepared from these animals and NMDAR-dependent long-term potentiation was assessed at the Schaffer collateral-CA1 synapse. In addition, we performed behavioral analyses using the open field and novel object recognition tasks. Results: NMDAR-dependent long-term potentiation in the hippocampal CA1 area was significantly suppressed, indicating successful NMDAR dysfunction in this subfield. Spontaneous locomotor activity as well as anxiety-related behavior in the open field did not differ between NMDAR-CSF-treated and control animals. In the novel object recognition task, there were no differences in the motivation to approach objects. In contrast, we observed a significantly preferred exploration of the novel object only in control, but not in NMDAR-CSF-treated rats. Conclusion: These results indicate that NMDAR dysfunction obtained by intrahippocampal stereotactic injection does not alter locomotor or anxiety-related behavior. In addition, approach to an object or exploratory behavior in general are not affected either, but intact initial NMDAR-dependent processes might be involved in novel object recognition.
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Affiliation(s)
- Maxi Kersten
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Theresa Rabbe
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Roman Blome
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Katrin Porath
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Tina Sellmann
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | | | - Rüdiger Köhling
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany.,Center of Transdisciplinary Neurosciences Rostock, University of Rostock, Rostock, Germany
| | - Timo Kirschstein
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany.,Center of Transdisciplinary Neurosciences Rostock, University of Rostock, Rostock, Germany
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11
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Bajorat R, Porath K, Kuhn J, Goßla E, Goerss D, Sellmann T, Köhling R, Kirschstein T. Oral administration of the casein kinase 2 inhibitor TBB leads to persistent K Ca2.2 channel up-regulation in the epileptic CA1 area and cortex, but lacks anti-seizure efficacy in the pilocarpine epilepsy model. Epilepsy Res 2018; 147:42-50. [PMID: 30219695 DOI: 10.1016/j.eplepsyres.2018.08.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 07/31/2018] [Accepted: 08/29/2018] [Indexed: 02/04/2023]
Abstract
Temporal lobe epilepsy (TLE) is the most common epileptic syndrome in adults and often presents with seizures that prove intractable with currently available anticonvulsants. Thus, there is still a need for new anti-seizure drugs in this condition. Recently, we found that the casein kinase 2 inhibitor 4,5,6,7-tetrabromotriazole (TBB) prevented the emergence of spontaneous epileptic discharges in an acute in vitro epilepsy model. This prompted us to study the anti-seizure effects of TBB in the pilocarpine model of chronic epilepsy in vivo. To this end, we performed long-term video-EEG monitoring lasting 78-167 days of nine chronically epileptic rats and obtained a baseline seizure rate of 3.3 ± 1.3 per day (baseline of 27-80 days). We found a significant age effect with more pronounced seizure rates in older animals as compared to younger ones. However, the seizure rate increased to 6.3 ± 2.2 per day during the oral TBB administration (treatment period of 21-50 days), and following discontinuation of TBB, this rate remained stable with 5.2 ± 1.4 seizures per day (follow-up of 30-55 days). After completing the video-EEG during the follow-up the hippocampal tissue was prepared and studied for the expression of the Ca2+-activated K+ channel KCa2.2. We found a significant up-regulation of KCa2.2 in the epileptic CA1 region and in the neocortex, but in no other hippocampal subfield. Hence, our findings indicate that oral administration of TBB leads to persistent up-regulation of KCa2.2 in the epileptic CA1 subfield and in the neocortex, but lacks anti-seizure efficacy in the pilocarpine epilepsy model.
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Affiliation(s)
- Rika Bajorat
- Oscar Langendorff Institute of Physiology, Rostock University Medical Centre, Rostock, Germany; Department of Anesthesiology and Intensive Care Medicine, Rostock University Medical Centre, Rostock, Germany.
| | - Katrin Porath
- Oscar Langendorff Institute of Physiology, Rostock University Medical Centre, Rostock, Germany.
| | - Johannes Kuhn
- Oscar Langendorff Institute of Physiology, Rostock University Medical Centre, Rostock, Germany.
| | - Elke Goßla
- Oscar Langendorff Institute of Physiology, Rostock University Medical Centre, Rostock, Germany.
| | - Doreen Goerss
- Oscar Langendorff Institute of Physiology, Rostock University Medical Centre, Rostock, Germany; Department of Psychosomatic and Psychotherapeutic Medicine, Rostock University Medical Centre, Rostock, Germany.
| | - Tina Sellmann
- Oscar Langendorff Institute of Physiology, Rostock University Medical Centre, Rostock, Germany.
| | - Rüdiger Köhling
- Oscar Langendorff Institute of Physiology, Rostock University Medical Centre, Rostock, Germany.
| | - Timo Kirschstein
- Oscar Langendorff Institute of Physiology, Rostock University Medical Centre, Rostock, Germany.
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12
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Blome R, Bach W, Guli X, Porath K, Sellmann T, Bien CG, Köhling R, Kirschstein T. Differentially Altered NMDAR Dependent and Independent Long-Term Potentiation in the CA3 Subfield in a Model of Anti-NMDAR Encephalitis. Front Synaptic Neurosci 2018; 10:26. [PMID: 30108497 PMCID: PMC6079239 DOI: 10.3389/fnsyn.2018.00026] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Accepted: 07/11/2018] [Indexed: 11/24/2022] Open
Abstract
Purpose: Autoantibodies against NMDA receptors (NMDAR) in the cerebrospinal fluid (CSF) from anti-NMDAR encephalitis patients have been suggested to be pathogenic since in previous studies using patient CSF, NMDAR-dependent processes such as long-term potentiation (LTP) were compromised. However, autoantibodies may represent a family of antibodies targeted against different epitopes, and CSF may contain further autoantibodies. Here, we tested the specificity of the autoantibody by comparing NMDAR-dependent and NMDAR-independent LTP within the same hippocampal subfield, CA3, using CSF samples from four anti-NMDAR encephalitis patients and three control patients. Methods: We performed a stereotactic injection of patient-derived cell-free CSF with proven presence or absence of NMDAR-antibodies into the rat hippocampus in vivo. Hippocampal brain slices were prepared 1–8 days after intrahippocampal injection, and NMDAR-dependent LTP at the associational-commissural (A/C) fiber-CA3 synapse was compared to NMDAR-independent LTP at the mossy fiber (MF)-CA3 synapse. Results: The LTP magnitude at A/C fiber-CA3 synapses in slices from control-CSF-treated animals (168 ± 8% n = 54) was significantly higher than LTP in slices from NMDAR-CSF-treated animals (139 ± 9%, n = 40; P = 0.015), although there was some variation between the individual CSF samples. We found residual LTP in NMDAR-CSF-treated tissue which could be abolished by the NMDAR inhibitor D-AP5. Moreover, the CA3 field excitatory postsynaptic potential (fEPSP) was followed by epileptiform afterpotentials in 5% of slices (4/78) from control-CSF-treated animals, but in 26% of slices (12/46) from NMDAR-CSF-treated animals (P = 0.002). Application of the LTP-inducing paradigm increased the proportion of slices with epileptiform afterpotentials, but D-AP5 significantly reduced the occurrence of epileptiform afterpotentials only in NMDAR-CSF-treated, but not in control tissue. At the MF synapse, no significant difference in LTP values of control-CSF and in NMDAR-CSF-treated tissue was observed indicating that NMDAR-independent MF-LTP is intact in NMDAR-CSF-treated tissue. Conclusion: These findings indicate that anti-NMDAR containing CSF impairs LTP at the A/C fiber-CA3 synapse, although there is substantial variation among CSF samples suggesting different epitopes among patient-derived antibodies. The differential inhibition of LTP at this synapse in contrast to the MF-CA3 synapse suggests the specificity and underlines the pathophysiological role of the NMDAR-antibody.
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Affiliation(s)
- Roman Blome
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Willi Bach
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Xiati Guli
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Katrin Porath
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Tina Sellmann
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | | | - Rüdiger Köhling
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Timo Kirschstein
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
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13
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Sellmann T, Meyer J. Nichtinvasive Ventilation im Notarzt- und Rettungsdienst. Notf Rett Med 2017. [DOI: 10.1007/s10049-017-0372-9] [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: 11/29/2022]
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14
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Neumann AM, Abele J, Kirschstein T, Engelmann R, Sellmann T, Köhling R, Müller-Hilke B. Mycophenolate mofetil prevents the delayed T cell response after pilocarpine-induced status epilepticus in mice. PLoS One 2017; 12:e0187330. [PMID: 29182639 PMCID: PMC5705158 DOI: 10.1371/journal.pone.0187330] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 10/17/2017] [Indexed: 01/01/2023] Open
Abstract
Growing clinical and laboratory evidence corroborates a role for the immune system in the pathophysiology of epilepsy. In order to delineate the immune response following pilocarpine-induced status epilepticus (SE) in the mouse, we monitored the kinetics of leukocyte presence in the hippocampus over the period of four weeks. SE was induced following a ramping protocol of pilocarpine injection into 4–5 weeks old C57BL/6 mice. Brains were removed at days 1–4, 14 or 28 after SE, and the hippocampi were analyzed via flow cytometry, via quantitative reverse transcriptase PCR (qRT-PCR) and via immunohistochemistry. Epileptogenesis was confirmed by Timm staining of mossy fiber sprouting in the inner molecular layer of the dentate gyrus. The flow cytometry data revealed a biphasic immune response following pilocarpine-induced SE with a transient increase in activated CD11b+ and F4/80+ macrophages within the first four days replaced by an increase in CD3+ T-lymphocytes around day 28. This delayed T cell response was confirmed via qRT-PCR and via immunohistochemistry. In addition, qRT-PCR data could show that the delayed T cell response was associated with an increased CD8/CD4 ratio indicating a cytotoxic T cell response after SE. Intriguingly, early intervention with mycophenolate mofetil administration on days 0–3 after SE prevented this delayed T cell response. These results show an orchestrated immunological sequela and provide evidence that the delayed T cell response is sensitive to early immunomodulatory intervention.
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Affiliation(s)
- Anne-Marie Neumann
- Institute of Immunology, University of Rostock, Rostock, Germany
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Julia Abele
- Institute of Immunology, University of Rostock, Rostock, Germany
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Timo Kirschstein
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Robby Engelmann
- Institute of Immunology, University of Rostock, Rostock, Germany
| | - Tina Sellmann
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
| | - Rüdiger Köhling
- Oscar Langendorff Institute of Physiology, University of Rostock, Rostock, Germany
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15
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Würdemann T, Kersten M, Tokay T, Guli X, Kober M, Rohde M, Porath K, Sellmann T, Bien CG, Köhling R, Kirschstein T. Stereotactic injection of cerebrospinal fluid from anti-NMDA receptor encephalitis into rat dentate gyrus impairs NMDA receptor function. Brain Res 2015; 1633:10-18. [PMID: 26721688 DOI: 10.1016/j.brainres.2015.12.027] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 10/24/2015] [Accepted: 12/15/2015] [Indexed: 01/17/2023]
Abstract
Autoimmune encephalitis is increasingly recognized in patients with otherwise unexplained encephalopathy with epilepsy. Among these, patients with anti-N-methyl D-aspartate receptor (NMDAR) encephalitis present epileptic seizures, memory deficits, and psychiatric symptoms. However, the functional consequences of such autoantibodies are poorly understood. In order to investigate the pathophysiology of this disease, we stereotactically injected either cerebrospinal fluid (CSF) from three anti-NMDAR encephalitis patients or commercially available anti-NMDAR1 into the dentate gyrus of adult female rats. Control animals were injected with either CSF obtained from three epilepsy patients (ganglioglioma, posttraumatic epilepsy, focal cortical dysplasia) lacking anti-NMDAR or saline. Intracellular recordings from dentate gyrus granule cells showed a significant reduction of the NMDAR-evoked excitatory postsynaptic potentials (NMDAR-EPSPs) in animals treated with anti-NMDAR. As a consequence of this, action potential firing in these cells by NMDAR-EPSPs was significantly impaired. Long-term potentiation in the dentate gyrus was also significantly reduced in rats injected with anti-NMDAR as compared to control animals. This was accompanied by a significantly impaired learning performance in the Morris water maze hidden platform task when the animals had been injected with anti-NMDAR antibody-containing CSF. Our findings suggest that anti-NMDAR lead to reduced NMDAR function in vivo which could contribute to the memory impairment found in patients with anti-NMDAR encephalitis.
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Affiliation(s)
- Till Würdemann
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - Maxi Kersten
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - Tursonjan Tokay
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - Xiati Guli
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - Maria Kober
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - Marco Rohde
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - Katrin Porath
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - Tina Sellmann
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | | | - Rüdiger Köhling
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany
| | - Timo Kirschstein
- Oscar Langendorff Institute of Physiology, University of Rostock, Germany.
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16
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Kirschstein T, Protzel C, Porath K, Sellmann T, Köhling R, Hakenberg OW. Age-dependent contribution of Rho kinase in carbachol-induced contraction of human detrusor smooth muscle in vitro. Acta Pharmacol Sin 2014; 35:74-81. [PMID: 24122009 DOI: 10.1038/aps.2013.126] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2013] [Accepted: 08/12/2013] [Indexed: 01/15/2023] Open
Abstract
AIM Activation of muscarinic receptors on the detrusor smooth muscle is followed by contraction, which involves both myosin light chain kinase (MLCK) and Rho kinase (ROCK). The aim of this study was to determine the relative contributions of MLCK and ROCK to carbachol-induced contraction of human detrusor smooth muscle in vitro. METHODS Detrusor smooth muscle strips were prepared from the macroscopically unaffected bladder wall of patients underwent cystectomy. The strips were fixed in an organ bath, and carbachol or KCl-induced isometric contractions were measured by force transducers. RESULTS Addition of carbachol (0.4-4 μmol/L) into the bath induced concentration-dependent contractions of detrusor specimens, which was completely abolished by atropine (1 μmol/L). Pre-incubation of detrusor specimens with either the MLCK inhibitor ML-9 or the ROCK inhibitors HA1100 and Y-27632 (each at 10 μmol/L) significantly blocked carbachol-induced contractions as compared to the time-control experiments. Moreover, MLCK and ROCK inhibition were equally effective in reducing carbachol-induced contractions. The residual carbachol-induced contractions in the presence of both MLCK and ROCK inhibitors were significantly smaller than the contractions obtained when only one enzyme (either MLCK or ROCK) was inhibited, suggesting an additive effect of the two kinases. Interestingly, ROCK-mediated carbachol-induced contractions were positively correlated to the age of patients (r=o.52, P<0.05). CONCLUSION Both MLCK and ROCK contribute to carbachol-induced contractions of human detrusor smooth muscle. ROCK inhibitors may be a new pharmacological approach to modulate human bladder hyperactivity.
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Müller L, Müller S, Sellmann T, Groeneweg L, Tokay T, Köhling R, Kirschstein T. Effects of oxygen insufflation during pilocarpine-induced status epilepticus on mortality, tissue damage and seizures. Epilepsy Res 2014; 108:90-7. [DOI: 10.1016/j.eplepsyres.2013.10.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 09/28/2013] [Accepted: 10/31/2013] [Indexed: 11/16/2022]
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18
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Bajorat R, Wilde M, Sellmann T, Kirschstein T, Köhling R. Seizure frequency in pilocarpine-treated rats is independent of circadian rhythm. Epilepsia 2011; 52:e118-22. [DOI: 10.1111/j.1528-1167.2011.03200.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sellmann A, Sellmann T, Rott G, Gerharz CD, Neuhaus W, Pfohl M. Eine seltene Ursache rezidivierender Hypoglykämien – Ein Fallbericht. DIABETOL STOFFWECHS 2010. [DOI: 10.1055/s-0030-1253923] [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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