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Neiva R, Caulino-Rocha A, Ferreirinha F, Lobo MG, Correia-de-Sá P. Non-genomic Actions of Methylprednisolone Differentially Influence GABA and Glutamate Release From Isolated Nerve Terminals of the Rat Hippocampus. Front Mol Neurosci 2020; 13:146. [PMID: 32848604 PMCID: PMC7419606 DOI: 10.3389/fnmol.2020.00146] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Accepted: 07/14/2020] [Indexed: 12/31/2022] Open
Abstract
Corticosteroids exert a dual role in eukaryotic cells through their action via (1) intracellular receptors (slow genomic responses), or (2) membrane-bound receptors (fast non-genomic responses). Highly vulnerable regions of the brain, like the hippocampus, express high amounts of corticosteroid receptors, yet their actions on ionic currents and neurotransmitters release are still undefined. Here, we investigated the effect of methylprednisolone (MP) on GABA and glutamate (Glu) release from isolated nerve terminals of the rat hippocampus. MP favored both spontaneous and depolarization-evoked [14C]Glu release from rat hippocampal nerve terminals, without affecting [3H]GABA outflow. Facilitation of [14C]Glu release by MP is mediated by a Na+-dependent Ca2+-independent non-genomic mechanism relying on the activation of membrane-bound glucocorticoid (GR) and mineralocorticoid (MR) receptors sensitive to their antagonists mifepristone and spironolactone, respectively. The involvement of Na+-dependent high-affinity EAAT transport reversal was inferred by blockage of MP-induced [14C]Glu release by DL-TBOA. Depolarization-evoked [3H]GABA release in the presence of MP was partially attenuated by the selective P2X7 receptor antagonist A-438079, but this compound did not affect the release of [14C]Glu. Data indicate that MP differentially affects GABA and glutamate release from rat hippocampal nerve terminals via fast non-genomic mechanisms putatively involving the activation of membrane-bound corticosteroid receptors. Facilitation of Glu release strengthen previous assumptions that MP may act as a cognitive enhancer in rats, while crosstalk with ATP-sensitive P2X7 receptors may promote a therapeutically desirable GABAergic inhibitory control during paroxysmal epileptic crisis that might be particularly relevant when extracellular Ca2+ levels decrease below the threshold required for transmitter release.
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Affiliation(s)
- Rafael Neiva
- Laboratório de Farmacologia e Neurobiologia - Departamento de Imuno-Fisiologia e Farmacologia, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Porto, Portugal.,Center for Drug Discovery and Innovative Medicines (MedInUP), Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Porto, Portugal
| | - Ana Caulino-Rocha
- Laboratório de Farmacologia e Neurobiologia - Departamento de Imuno-Fisiologia e Farmacologia, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Porto, Portugal.,Center for Drug Discovery and Innovative Medicines (MedInUP), Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Porto, Portugal
| | - Fátima Ferreirinha
- Laboratório de Farmacologia e Neurobiologia - Departamento de Imuno-Fisiologia e Farmacologia, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Porto, Portugal.,Center for Drug Discovery and Innovative Medicines (MedInUP), Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Porto, Portugal
| | - Maria Graça Lobo
- Laboratório de Farmacologia e Neurobiologia - Departamento de Imuno-Fisiologia e Farmacologia, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Porto, Portugal.,Center for Drug Discovery and Innovative Medicines (MedInUP), Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Porto, Portugal
| | - Paulo Correia-de-Sá
- Laboratório de Farmacologia e Neurobiologia - Departamento de Imuno-Fisiologia e Farmacologia, Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Porto, Portugal.,Center for Drug Discovery and Innovative Medicines (MedInUP), Instituto de Ciências Biomédicas de Abel Salazar (ICBAS), Universidade do Porto (UP), Porto, Portugal
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Leino T, Yaksh T, Horais K, Haapalinna A. Pharmacodynamics of intrathecal and epidural fadolmidine, an α 2-adrenoceptor agonist, after bolus and infusion in dogs-comparison with clonidine. Naunyn Schmiedebergs Arch Pharmacol 2020; 393:1459-1473. [PMID: 32179953 DOI: 10.1007/s00210-020-01850-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 03/06/2020] [Indexed: 01/09/2023]
Abstract
An α2-adrenoceptor agonist, clonidine, is extensively used in both anesthesia and intensive care medicine. However, clonidine may produce pronounced hemodynamic side effects such as hypotension and bradycardia which may limit its usefulness in certain conditions. Fadolmidine is a potent α2-adrenoceptor agonist with different physicochemical properties than clonidine. Here, the effects of fadolmidine and clonidine on analgesia (an increase in thermal skin twitch response latency), sedation, blood pressure, heart rate, respiratory rate, and body temperature were evaluated either up to 8 h after either intrathecal or epidural bolus injections or during a 24-h continuous intrathecal infusion at equipotent analgesic doses in non-anesthetized Beagle dogs. Fadolmidine and clonidine produced a dose-dependent and equipotent maximal antinociception after intrathecal bolus injection (ED50: 67 μg and 78 μg, respectively), but the duration of action of fadolmidine was more long-lasting. During the intrathecal infusion, fadolmidine achieved a good analgesic effect without evoking cardiovascular side effects, e.g., hypotension; these were evident during clonidine infusion. Epidurally, the antinociceptive potency of fadolmidine was weaker (ED50: 128 μg) than when intrathecally administered and weaker than that of epidural clonidine (ED50: 51 μg). At analgesic doses, fadolmidine injection induced moderate initial hypertension concomitantly with a decrease in heart rate whereas clonidine evoked hypotension and bradycardia. These results suggest that especially when non-opioid long-term pain relief is needed, an intrathecal infusion of fadolmidine can provide long-term antinociception with less of the known use-limiting adverse effects associated with clonidine.
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Affiliation(s)
- Tiina Leino
- Research and Development, Orion Corporation Orion Pharma, P.O.Box 425, 20101, Turku, Finland.
| | - Tony Yaksh
- Department of Anesthesiology, University of California, 9500 Gilman Drive, San Diego, CA, 92093, USA
| | - Kjersti Horais
- Department of Anesthesiology, University of California, 9500 Gilman Drive, San Diego, CA, 92093, USA
| | - Antti Haapalinna
- Research and Development, Orion Corporation Orion Pharma, P.O.Box 425, 20101, Turku, Finland
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Nonsurgical medical treatment in the management of pain due to lumbar disc prolapse: A network meta-analysis. Semin Arthritis Rheum 2019; 49:303-313. [PMID: 30940466 DOI: 10.1016/j.semarthrit.2019.02.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2018] [Revised: 02/20/2019] [Accepted: 02/22/2019] [Indexed: 11/24/2022]
Abstract
BACKGROUND Evaluate the comparative effectiveness of treatment strategies for patients with pain due to lumbar disc prolapse (LDP). METHODS PubMed, EMBASE, and the Cochrane Database were searched through September 2017. Randomized controlled trials on LDP reporting on pain intensity and/or global pain effects which compared included treatments head-to-head, against placebo, and/or against conventional care were included. Study data were independently double-extracted and data on patient traits and outcomes were collected. Risk of bias was assessed using the Cochrane risk of bias tool. Separate Bayesian network meta-analyses were undertaken to synthesize direct and indirect, short-term and long-term outcomes, summarized as odds ratios (OR) or weighted mean differences (WMD) with 95% credible intervals (CI) as well as surface under the cumulative ranking curve (SUCRA) values. RESULTS 58 studies in global effects and 74 studies in pain intensity analysis were included. Thirty-eight (65.5%) of these studies reported a possible elevated risk of bias. Autonomic drugs and transforminal epidural steroid injections (TESIs) had the highest SUCRA scores at short-term follow up (86.7 and 83.5 respectively), while Cytokines/Immunomodulators and TESI had the highest SUCRA values at long-term-follow-up in the global effect's analysis (86.6 and 80.9 respectively). Caudal steroid injections and TESIs had the highest SUCRA scores at short-term follow up (79.4 and 75.9 respectively), while at long-term follow-up biological agents and manipulation had the highest SUCRA scores (86.4 and 68.5 respectively) for pain intensity. Some treatments had few studies and/or no associated placebo-controlled trials. Studies often did not report on co-interventions, systematically differed, and reported an overall elevated risk of bias. CONCLUSION No treatment stands out as superior when compared on multiple outcomes and time periods but TESIs show promise as an effective short-term treatment. High quality studies are needed to confirm many nodes of this network meta-analysis.
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de Vargas LDS, Gonçalves R, Lara MVS, Costa-Ferro ZSM, Salamoni SD, Domingues MF, Piovesan AR, de Assis DR, Vinade L, Corrado AP, Alves-Do-Prado W, Correia-de-Sá P, da Costa JC, Izquierdo I, Dal Belo CA, Mello-Carpes PB. Methylprednisolone as a memory enhancer in rats: Effects on aversive memory, long-term potentiation and calcium influx. Brain Res 2017; 1670:44-51. [PMID: 28606783 DOI: 10.1016/j.brainres.2017.06.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 06/03/2017] [Accepted: 06/05/2017] [Indexed: 12/16/2022]
Abstract
It is well recognized that stress or glucocorticoids hormones treatment can modulate memory performance in both directions, either impairing or enhancing it. Despite the high number of studies aiming at explaining the effects of glucocorticoids on memory, this has not yet been completely elucidated. Here, we demonstrate that a low daily dose of methylprednisolone (MP, 5mg/kg, i.p.) administered for 10-days favors aversive memory persistence in adult rats, without any effect on the exploring behavior, locomotor activity, anxiety levels and pain perception. Enhanced performance on the inhibitory avoidance task was correlated with long-term potentiation (LTP), a phenomenon that was strengthen in hippocampal slices of rats injected with MP (5mg/kg) during 10days. Additionally, in vitro incubation with MP (30-300µM) concentration-dependently increased intracellular [Ca2+]i in cultured hippocampal neurons depolarized by KCl (35mM). In conclusion, a low daily dose of MP for 10days may promote aversive memory persistence in rats.
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Affiliation(s)
| | - Rithiele Gonçalves
- Physiology Research Group, Federal University of Pampa, Uruguaiana, RS, Brazil
| | | | - Zaquer S M Costa-Ferro
- Laboratory of Neuroscience, Brain Institute of Rio Grande do Sul, InsCer, PUCRS, Porto Alegre, RS, Brazil
| | - Simone Denise Salamoni
- Laboratory of Neuroscience, Brain Institute of Rio Grande do Sul, InsCer, PUCRS, Porto Alegre, RS, Brazil
| | - Michelle Flores Domingues
- Graduate Program in Cell and Molecular Biology, Center of Biotechnology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Laboratory of Neurotoxins, Laneurotox, Brain Institute of Rio Grande do Sul, InsCer, PUCRS, Porto Alegre, RS, Brazil
| | - Angela Regina Piovesan
- Graduate Program in Cell and Molecular Biology, Center of Biotechnology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Laboratory of Neurotoxins, Laneurotox, Brain Institute of Rio Grande do Sul, InsCer, PUCRS, Porto Alegre, RS, Brazil
| | - Dênis Reis de Assis
- Laboratory of Neuroscience, Brain Institute of Rio Grande do Sul, InsCer, PUCRS, Porto Alegre, RS, Brazil
| | - Lucia Vinade
- Laboratory of Neurobiology and Toxinology, Lanetox, Federal University of Pampa, São Gabriel, RS, Brazil
| | - Alexandre P Corrado
- Department of Pharmacology, FMRP, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Wilson Alves-Do-Prado
- Department of Pharmacology and Therapeutics, State University of Maringa, PR, Brazil
| | - Paulo Correia-de-Sá
- Laboratory of Pharmacology and Neurobiology, Center for Drug Discovery and Innovative Medicines (MedInUP), Instituto de Ciências Biomédicas de Abel Salazar, Universidade do Porto, Portugal
| | - Jaderson Costa da Costa
- Laboratory of Neuroscience, Brain Institute of Rio Grande do Sul, InsCer, PUCRS, Porto Alegre, RS, Brazil
| | - Ivan Izquierdo
- Centre of Memory, Brain Institute of Rio Grande do Sul, InsCer, PUCRS, Porto Alegre, RS, Brazil
| | - Cháriston A Dal Belo
- Laboratory of Neurobiology and Toxinology, Lanetox, Federal University of Pampa, São Gabriel, RS, Brazil
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Kaliya-Perumal AK, Yeh YC, Luo CA, Joey-Tan KY. Assessment of Anteroposterior Subpedicular Approach and Oblique Scotty Dog Subpedicular Approach for Selective Nerve Root Block. Clin Orthop Surg 2017; 9:71-76. [PMID: 28261430 PMCID: PMC5334030 DOI: 10.4055/cios.2017.9.1.71] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 12/13/2016] [Indexed: 11/06/2022] Open
Abstract
Background The technique used to administer a selective nerve root block (SNRB) varies depending on individual expertise. Both the anteroposterior (AP) subpedicular approach and oblique Scotty dog subpedicular approach are widely practiced. However, the literature does not provide a clear consensus regarding which approach is more suitable. Hence, we decided to analyse the procedural parameters and clinical outcomes following SNRBs using these two approaches. Methods Patients diagnosed with a single lumbar herniated intervertebral disc (HIVD) refractory to conservative management but not willing for immediate surgery were selected for a prospective nonrandomized comparative study. An SNRB was administered as a therapeutic alternative using the AP subpedicular approach in one group (n = 25; mean age, 45 ± 5.4 years) and the oblique Scotty dog subpedicular approach in the other group (n = 22; mean age, 43.8 ± 4.7 years). Results were compared in terms of the duration of the procedure, the number of C-arm exposures, accuracy, pain relief, functional outcome and the duration of relief. Results Our results suggest that the oblique Scotty dog subpedicular approach took a significantly longer duration (p = 0.02) and a greater number of C-arm exposures (p = 0.001). But, its accuracy of needle placement was 95.5% compared to only 72% using the AP subpedicular approach (p = 0.03). There was no significant difference in terms of clinical outcomes between these approaches. Conclusions The AP subpedicular approach was simple and facile, but the oblique Scotty dog subpedicular approach was more accurate. However, a brief window period of pain relief was achieved irrespective of the approaching technique used.
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Affiliation(s)
- Arun-Kumar Kaliya-Perumal
- Department of Orthopaedic Surgery, Melmaruvathur Adhiparasakthi Institute of Medical Sciences and Research, Melmaruvathur, Tamil Nadu, India
| | - Yu-Cheng Yeh
- Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Chi-An Luo
- Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taoyuan, Taiwan
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Abstract
BACKGROUND AND OBJECTIVE Epidural corticosteroid injections (ESIs) have been used for several decades and now represent the most common intervention performed for the management of back pain with a radicular component. However, several reports have presented devastating complications and adverse effects, which fuelled concerns over the risk versus clinical effectiveness. The authors offer a comprehensive review of the available literature and analyse the data derived from studies and case reports. METHODS Studies were identified by searching PubMed MEDLINE, Ovid MEDLINE, EMBASE, Scopus, Google Scholar and the Cochrane Library to retrieve all available relevant articles. Publications from the last 20 years (September 1994 to September 2014) were considered for further analysis. Studies selected were English-language original articles publishing results on complications related to the technique used for cervical and lumbar ESIs. The studies had to specify the approach used for injection. All studies that did not fulfil these eligibility criteria were excluded from further analysis. RESULTS Overall, the available literature supports the view that serious complications following injections of corticosteroid suspensions into the cervical and lumbar epidural space are uncommon, but if they occur they can be devastating. CONCLUSIONS The true incidence of such complications remains unclear. Direct vascular injury and/or administration of injectates intra-arterially represent a major concern and could account for the vast majority of the adverse events reported. Accurate placement of the needle, use of a non-particulate corticosteroid, live fluoroscopy, digital subtraction angiography, and familiarisation of the operator with contrast patterns on fluoroscopy should minimise these risks. The available literature has several limitations including incomplete documentation, unreported data and inherent bias. Large registries and well-structured observational studies are needed to determine the true incidence of adverse events and address the safety concerns.
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