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Chen Z, Taubert M, Chen C, Dokos C, Fuhr U, Weig T, Zoller M, Heck S, Dimitriadis K, Terpolilli N, Kinast C, Scharf C, Lier C, Dorn C, Liebchen U. Plasma and Cerebrospinal Fluid Population Pharmacokinetics of Vancomycin in Patients with External Ventricular Drain. Antimicrob Agents Chemother 2023; 67:e0024123. [PMID: 37162349 PMCID: PMC10269048 DOI: 10.1128/aac.00241-23] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 04/15/2023] [Indexed: 05/11/2023] Open
Abstract
Vancomycin is a commonly used antibacterial agent in patients with primary central nervous system (CNS) infection. This study aims to examine predictors of vancomycin penetration into cerebrospinal fluid (CSF) in patients with external ventricular drainage and the feasibility of CSF sampling from the distal drainage port for therapeutic drug monitoring. Fourteen adult patients (9 with primary CNS infection) were treated with vancomycin intravenously. The vancomycin concentrations in blood and CSF (from proximal [CSF_P] and distal [CSF_D] drainage ports) were evaluated by population pharmacokinetics. Model-based simulations were conducted to compare various infusion modes. A three-compartment model with first-order elimination best described the vancomycin data. Estimated parameters included clearance (CL, 4.53 L/h), central compartment volume (Vc, 24.0 L), apparent CSF compartment volume (VCSF, 0.445 L), and clearance between central and CSF compartments (QCSF, 0.00322 L/h and 0.00135 L/h for patients with and without primary CNS infection, respectively). Creatinine clearance was a significant covariate on vancomycin CL. CSF protein was the primary covariate to explain the variability of QCSF. There was no detectable difference between the data for sampling from the proximal and the distal port. Intermittent infusion and continuous infusion with a loading dose reached the CSF target concentration faster than continuous infusion only. All infusion schedules reached similar CSF trough concentrations. Beyond adjusting doses according to renal function, starting treatment with a loading dose in patients with primary CSF infection is recommended. Occasionally, very high and possibly toxic doses would be required to achieve adequate CSF concentrations, which calls for more investigation of direct intraventricular administration of vancomycin. (This study has been registered at ClinicalTrials.gov under registration no. NCT04426383).
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Affiliation(s)
- Zhendong Chen
- Department I of Pharmacology, Center for Pharmacology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Max Taubert
- Department I of Pharmacology, Center for Pharmacology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Chunli Chen
- Department I of Pharmacology, Center for Pharmacology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, College of Veterinary Medicine, Northeast Agricultural University, Harbin, People’s Republic of China
| | - Charalambos Dokos
- Department I of Pharmacology, Center for Pharmacology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Uwe Fuhr
- Department I of Pharmacology, Center for Pharmacology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Thomas Weig
- Department of Anesthesiology, University Hospital, Ludwig Maximilians University of Munich, Munich, Germany
| | - Michael Zoller
- Department of Anesthesiology, University Hospital, Ludwig Maximilians University of Munich, Munich, Germany
| | - Suzette Heck
- Department of Neurology, University Hospital, Ludwig Maximilian University, Munich, Germany
| | - Konstantinos Dimitriadis
- Department of Neurology, University Hospital, Ludwig Maximilian University, Munich, Germany
- Institute for Stroke and Dementia Research (ISD), University Hospital, Ludwig Maximilians University, Munich, Germany
| | - Nicole Terpolilli
- Institute for Stroke and Dementia Research (ISD), University Hospital, Ludwig Maximilians University, Munich, Germany
- Department of Neurosurgery, Munich University Hospital, Munich, Germany
| | - Christina Kinast
- Department of Anesthesiology, University Hospital, Ludwig Maximilians University of Munich, Munich, Germany
| | - Christina Scharf
- Department of Anesthesiology, University Hospital, Ludwig Maximilians University of Munich, Munich, Germany
| | - Constantin Lier
- Institute of Pharmacy, Faculty of Chemistry and Pharmacy, University of Regensburg, Regensburg, Germany
| | - Christoph Dorn
- Institute of Pharmacy, Faculty of Chemistry and Pharmacy, University of Regensburg, Regensburg, Germany
| | - Uwe Liebchen
- Department of Anesthesiology, University Hospital, Ludwig Maximilians University of Munich, Munich, Germany
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Hossain I, Younsi A, Castaño Leon AM, Lippa L, Tóth P, Terpolilli N, Tobieson L, Latini F, Raabe A, Depreitere B, Rostami E. Huge variability in restrictions of mobilization for patients with aneurysmal subarachnoid hemorrhage - A European survey of practice. Brain Spine 2023; 3:101731. [PMID: 37383447 PMCID: PMC10293289 DOI: 10.1016/j.bas.2023.101731] [Citation(s) in RCA: 1] [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] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Revised: 03/09/2023] [Accepted: 03/16/2023] [Indexed: 06/30/2023]
Abstract
Introduction One of the major goals of neurointensive care is to prevent secondary injuries following aSAH. Bed rest and patient immobilization are practiced in order to decrease the risk of DCI. Research question To explore the current practices in place concerning the management of patients with aSAH, specifically, protocols and habits regarding restrictions of mobilization and HOB positioning. Material and methods A survey was designed, modified, and approved by the panel of the Trauma & Critical Care section of the EANS to cover the practice of restrictions of patient mobilization and HOB positioning in patients with aSAH. Results Twenty-nine physicians from 17 countries completed the questionnaire. The majority (79.3%) stated that non-secured aneurysm and the presence of an EVD were the factors related to the establishment of restriction of mobilization. The average duration of the restriction varied widely ranging between 1 and 21 days. The presence of an EVD (13.8%) was found to be the main reason to recommend restriction of HOB elevation. The average duration of restriction of HOB positioning ranged between 3 and 14 days. Rebleeding or complications related to CSF over-drainage were found to be related to these restrictions. Discussion and conclusion Restriction of patient mobilization regimens vary widely in Europe. Current limited evidence does not support an increased risk of DCI rather the early mobilization might be beneficial. Large prospective studies and/or the initiative of a RCT are needed to understand the significance of early mobilization on the outcome of patients with aSAH.
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Affiliation(s)
- Iftakher Hossain
- Neurocenter, Department of Neurosurgery, Turku University Hospital, Turku, Finland
- Department of Clinical Neurosciences, Neurosurgery Unit, University of Cambridge, Addenbrooke's Hospital, Cambridge, United Kingdom
| | - Alexander Younsi
- Department of Neurosurgery, University Hospital Heidelberg, Heidelberg, Germany
| | - Ana Maria Castaño Leon
- Department of Neurosurgery, Hospital Universitario 12 de Octubre, Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Madrid, Spain
| | - Laura Lippa
- Department of Neurosurgery, Ospedale Niguarda, Milano, Italy
| | - Péter Tóth
- Department of Neurosurgery, University of Pecs, Hungary
| | - Nicole Terpolilli
- Department of Neurosurgery, Munich University Hospital, Munich, Germany
| | - Lovisa Tobieson
- Department of Neurosurgery of Linköping, Linköping University, Linköping, Sweden
- Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Francesco Latini
- Department of Medical Sciences, Section of Neurosurgery, Uppsala University, Uppsala, Sweden
| | - Andreas Raabe
- Department of Neurosurgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Bart Depreitere
- Department of Neurosurgery, University Hospitals Leuven, Leuven, Belgium
| | - Elham Rostami
- Department of Medical Sciences, Section of Neurosurgery, Uppsala University, Uppsala, Sweden
- Department of Neuroscience, Karolinska Institute, Stockholm, Sweden
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Fung C, Z'Graggen WJ, Jakob SM, Gralla J, Haenggi M, Rothen HU, Mordasini P, Lensch M, Söll N, Terpolilli N, Feiler S, Oertel MF, Raabe A, Plesnila N, Takala J, Beck J. Inhaled Nitric Oxide Treatment for Aneurysmal SAH Patients With Delayed Cerebral Ischemia. Front Neurol 2022; 13:817072. [PMID: 35250821 PMCID: PMC8894247 DOI: 10.3389/fneur.2022.817072] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 11/17/2021] [Accepted: 01/24/2022] [Indexed: 11/22/2022] Open
Abstract
Background We demonstrated experimentally that inhaled nitric oxide (iNO) dilates hypoperfused arterioles, increases tissue perfusion, and improves neurological outcome following subarachnoid hemorrhage (SAH) in mice. We performed a prospective pilot study to evaluate iNO in patients with delayed cerebral ischemia after SAH. Methods SAH patients with delayed cerebral ischemia and hypoperfusion despite conservative treatment were included. iNO was administered at a maximum dose of 40 ppm. The response to iNO was considered positive if: cerebral artery diameter increased by 10% in digital subtraction angiography (DSA), or tissue oxygen partial pressure (PtiO2) increased by > 5 mmHg, or transcranial doppler (TCD) values decreased more than 30 cm/sec, or mean transit time (MTT) decreased below 6.5 secs in CT perfusion (CTP). Patient outcome was assessed at 6 months with the modified Rankin Scale (mRS). Results Seven patients were enrolled between February 2013 and September 2016. Median duration of iNO administration was 23 h. The primary endpoint was reached in all patients (five out of 17 DSA examinations, 19 out of 29 PtiO2 time points, nine out of 26 TCD examinations, three out of five CTP examinations). No adverse events necessitating the cessation of iNO were observed. At 6 months, three patients presented with a mRS score of 0, one patient each with an mRS score of 2 and 3, and two patients had died. Conclusion Administration of iNO in SAH patients is safe. These results call for a larger prospective evaluation.
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Affiliation(s)
- Christian Fung
- Department of Neurosurgery, Medical Center, University of Freiburg, Freiburg, Germany
| | - Werner J Z'Graggen
- Department of Neurosurgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Stephan M Jakob
- Department of Intensive Care Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Jan Gralla
- Department of Diagnostic and Interventional Neuroradiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Matthias Haenggi
- Department of Intensive Care Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Hans-Ulrich Rothen
- Department of Intensive Care Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Pasquale Mordasini
- Department of Diagnostic and Interventional Neuroradiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Michael Lensch
- Department of Intensive Care Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Nicole Söll
- Department of Neurosurgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Nicole Terpolilli
- Institute for Stroke and Dementia Research (ISD), Munich University Hospital, Munich, Germany
- Department of Neurosurgery, Munich University Hospital, Munich, Germany
| | - Sergej Feiler
- Department of Neurosurgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Markus F Oertel
- Department of Neurosurgery, University Hospital Zurich, Zurich, Switzerland
| | - Andreas Raabe
- Department of Neurosurgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Nikolaus Plesnila
- Institute for Stroke and Dementia Research (ISD), Munich University Hospital, Munich, Germany
| | - Jukka Takala
- Department of Intensive Care Medicine, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Jürgen Beck
- Department of Neurosurgery, Medical Center, University of Freiburg, Freiburg, Germany
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Hadi I, Biczok A, Terpolilli N, Thorsteinsdottir J, Forbrig R, Albert N, Yanchovski P, Zollner B, Bodensohn R, Corradini S, Bartenstein P, Belka C, Tonn J, Schichor C, Niyazi M. OC-0078 Impact of surgery and PET-guided radiotherapy in therapy management of cavernous sinus meningioma. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)06772-4] [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: 11/16/2022]
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Hadi I, Biczok A, Terpolilli N, Thorsteinsdottir J, Forbrig R, Albert NL, Yanchovski P, Zollner B, Bodensohn R, Corradini S, Bartenstein P, Belka C, Tonn JC, Schichor C, Niyazi M. Multimodal therapy of cavernous sinus meningioma: Impact of surgery and 68Ga-DOTATATE PET-guided radiation therapy on tumor control and functional outcome. Neurooncol Adv 2021; 3:vdab114. [PMID: 34704034 PMCID: PMC8541706 DOI: 10.1093/noajnl/vdab114] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Functional preservation in patients with WHO grade I meningioma involving the cavernous sinus (CSM) is crucial for long-term tumor control. Concise data on the functional outcome of an interdisciplinary, multimodal treatment are scarce. We analyzed functional outcome and tumor control in CSM patients following maximal safe resection (MSR), fractionated stereotactic radiotherapy (FSRT), or combination of them, retrospectively. METHODS Patients with WHO grade I CSM treated between 2003 and 2017 were included. Prior to FSRT, a 68Ga-DOTATATE PET/CT was performed for radiation planning. Progression-free survival (PFS) was analyzed using Kaplan-Meier method and log-rank test was performed to test differences between groups. Visual function was analyzed at baseline and follow-up. RESULTS Eighty-five patients were included. MSR alone was performed in 48 patients (group A), MSR followed by FSRT in 25 patients (group B), and FSRT alone in 12 patients (group C). Intracranial tumor volumes were higher in A and B compared to C (median 9.2/10.8/4.3 ccm for A/B/C, P = .023). Median follow-up was 47/46/45 months and PFS at 5 years 55.7%, 100%, and 100% in A/B/C, respectively (P < .001). Optic nerve compression was more common in A (91.7%) and B (84.0%) than C (16.7%), P < .001. Post-therapeutic new onset or deterioration of double vision was observed in 29% (A), 17% (B), and 0% (C). CONCLUSION Personalized treatment strategies for CSM are essential to control space-occupying or functionally compromising lesions. The additional potential side effect of radiotherapy seems to be justified under the aspect of longer tumor control with low functional risk. Without space-occupying effect of CSM, FSRT alone is reasonably possible.
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Affiliation(s)
- Indrawati Hadi
- Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany
| | - Annamaria Biczok
- Department of Neurosurgery, University Hospital, LMU Munich, Munich, Germany
| | - Nicole Terpolilli
- Department of Neurosurgery, University Hospital, LMU Munich, Munich, Germany
| | | | - Robert Forbrig
- Department of Neuroradiology, University Hospital, LMU Munich, Munich, Germany
| | - Nathalie L Albert
- Department of Nuclear Medicine, University Hospital, LMU Munich, Munich, Germany
| | - Petar Yanchovski
- Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany
| | - Barbara Zollner
- Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany
| | - Raphael Bodensohn
- Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany
| | - Stefanie Corradini
- Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany
| | - Peter Bartenstein
- Department of Nuclear Medicine, University Hospital, LMU Munich, Munich, Germany
| | - Claus Belka
- Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany
- German Cancer Consortium (DKTK), partner site Munich, Munich, Germany
| | - Jörg-Christian Tonn
- Department of Neurosurgery, University Hospital, LMU Munich, Munich, Germany
- German Cancer Consortium (DKTK), partner site Munich, Munich, Germany
| | - Christian Schichor
- Department of Neurosurgery, University Hospital, LMU Munich, Munich, Germany
| | - Maximilian Niyazi
- Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany
- German Cancer Consortium (DKTK), partner site Munich, Munich, Germany
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Lenski M, Hofereiter J, Terpolilli N, Sandner T, Zausinger S, Tonn JC, Kreth FW, Schichor C. Dual-room CT with a sliding gantry for intraoperative imaging: feasibility and workflow analysis of an interdisciplinary concept. Int J Comput Assist Radiol Surg 2018; 14:397-407. [DOI: 10.1007/s11548-018-1812-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Accepted: 06/12/2018] [Indexed: 10/28/2022]
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Schichor C, Terpolilli N, Thorsteinsdottir J, Tonn JC. Intraoperative Computed Tomography in Cranial Neurosurgery. Neurosurg Clin N Am 2017; 28:595-602. [DOI: 10.1016/j.nec.2017.05.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [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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Terpolilli N, Rachinger W, Kunz M, Tonn JC, Schichor C. Intraoperative Control of Resection and Neuronavigation During Operation of Skull Base and Orbit-Associated Tumors: Feasibility and Possible Advantages of Intraoperative Computed Tomography (iCT). Skull Base Surg 2016. [DOI: 10.1055/s-0036-1592577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Schichor C, Terpolilli N, Ueberschaer M, Niyazi M, Thon N, Tonn JC. Long-Term Outcome in Orbital Meningiomas: Progression-Free Survival after Targeted Resection Combined with Early or Postponed Postoperative Radiotherapy. Skull Base Surg 2016. [DOI: 10.1055/s-0036-1592578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Tonn J, Rachinger W, Thon N, Terpolilli N, Haug A, Ertl L, Poeschl J, Schueller U, Schichor C. Increased 68Ga-DOTATATE uptake in PET imaging to discriminate meningioma and tumor-free tissue. J Clin Oncol 2014. [DOI: 10.1200/jco.2014.32.15_suppl.e13020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Joerg Tonn
- Department of Neurosurgery, LMU Munich, Munich, Germany
| | | | - Niklas Thon
- Department of Neurosurgery, LMU Munich, Munich, Germany
| | | | - Alexander Haug
- Klinikum Grosshadern, Department of Nuclear Medicine, University of Munich, Munich, Germany
| | - Lorenz Ertl
- Institute for Neuroradiology LMU, Munich, Germany
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von Baumgarten L, Pfeifenbring S, Terpolilli N, Schüller U, Jahn K, Opherk C, Freilinger T. A young man with symptomatic epilepsy and right hemianopia: family affair. Neurology 2012; 79:2008-9. [PMID: 23128442 DOI: 10.1212/wnl.0b013e3182735c68] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Dolga AM, Terpolilli N, Kepura F, Nijholt IM, Knaus HG, D'Orsi B, Prehn JHM, Eisel ULM, Plant T, Plesnila N, Culmsee C. KCa2 channels activation prevents [Ca2+]i deregulation and reduces neuronal death following glutamate toxicity and cerebral ischemia. Cell Death Dis 2011; 2:e147. [PMID: 21509037 PMCID: PMC3122061 DOI: 10.1038/cddis.2011.30] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [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] [Indexed: 11/10/2022]
Abstract
Exacerbated activation of glutamate receptor-coupled calcium channels and subsequent increase in intracellular calcium ([Ca2+]i) are established hallmarks of neuronal cell death in acute and chronic neurological diseases. Here we show that pathological [Ca2+]i deregulation occurring after glutamate receptor stimulation is effectively modulated by small conductance calcium-activated potassium (KCa2) channels. We found that neuronal excitotoxicity was associated with a rapid downregulation of KCa2.2 channels within 3 h after the onset of glutamate exposure. Activation of KCa2 channels preserved KCa2 expression and significantly reduced pathological increases in [Ca2+]i providing robust neuroprotection in vitro and in vivo. These data suggest a critical role for KCa2 channels in excitotoxic neuronal cell death and propose their activation as potential therapeutic strategy for the treatment of acute and chronic neurodegenerative disorders.
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Affiliation(s)
- A M Dolga
- Institut für Pharmakologie und Klinische Pharmazie, Fachbereich Pharmazie, Philipps-Universität Marburg, Marburg, Germany
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van den Maagdenberg AMJM, Pizzorusso T, Kaja S, Terpolilli N, Shapovalova M, Hoebeek FE, Barrett CF, Gherardini L, van de Ven RCG, Todorov B, Broos LAM, Tottene A, Gao Z, Fodor M, De Zeeuw CI, Frants RR, Plesnila N, Plomp JJ, Pietrobon D, Ferrari MD. High cortical spreading depression susceptibility and migraine-associated symptoms in Ca(v)2.1 S218L mice. Ann Neurol 2010; 67:85-98. [PMID: 20186955 DOI: 10.1002/ana.21815] [Citation(s) in RCA: 168] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE The CACNA1A gene encodes the pore-forming subunit of neuronal Ca(V)2.1 Ca2+ channels. In patients, the S218L CACNA1A mutation causes a dramatic hemiplegic migraine syndrome that is associated with ataxia, seizures, and severe, sometimes fatal, brain edema often triggered by only a mild head trauma. METHODS We introduced the S218L mutation into the mouse Cacna1a gene and studied the mechanisms for the S218L syndrome by analyzing the phenotypic, molecular, and electrophysiological consequences. RESULTS Cacna1a(S218L) mice faithfully mimic the associated clinical features of the human S218L syndrome. S218L neurons exhibit a gene dosage-dependent negative shift in voltage dependence of Ca(V)2.1 channel activation, resulting in enhanced neurotransmitter release at the neuromuscular junction. Cacna1a(S218L) mice also display an exquisite sensitivity to cortical spreading depression (CSD), with a vastly reduced triggering threshold, an increased propagation velocity, and frequently multiple CSD events after a single stimulus. In contrast, mice bearing the R192Q CACNA1A mutation, which in humans causes a milder form of hemiplegic migraine, typically exhibit only a single CSD event after one triggering stimulus. INTERPRETATION The particularly low CSD threshold and the strong tendency to respond with multiple CSD events make the S218L cortex highly vulnerable to weak stimuli and may provide a mechanistic basis for the dramatic phenotype seen in S218L mice and patients. Thus, the S218L mouse model may prove a valuable tool to further elucidate mechanisms underlying migraine, seizures, ataxia, and trauma-triggered cerebral edema.
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