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Effects of Lippia sidoides essential oil, thymol, p-cymene, myrcene and caryophyllene on rat sciatic nerve excitability BJMBR
Barbosa,R.; Cruz-Mendes,Y.; Silva-Alves,K.S.; Ferreira-da-Silva,F.W.; Ribeiro,N.M.; Morais,L.P.; Leal-Cardoso,J.H..
Lippia sidoides Cham is a typical herb species of Northeast Brazil with widespread use in folk medicine. The major constituents of the essential oil of L. sidoides (EOLs) are thymol, p-cymene, myrcene, and caryophyllene. Several studies have shown that the EOLs and its constituents have pharmacological effects, including antibacterial, anti-inflammatory, antioxidant and neuroprotective activity. Therefore, this work aimed to investigate the effects of the EOLs and their main constituents on rat sciatic nerve excitability. The sciatic nerves of adult Wistar rats were dissected and mounted in a moist chamber. Nerves were stimulated by square wave pulses, with an amplitude of 40 V, duration of 100 μs to 0.2 Hz. Both EOLs and thymol inhibited compound action...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compound action potential; Essential oil; Lippia sidoides; Thyme oil; P-cymene; Myrcene.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017001200611
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Essential oil of Lippia alba and its main constituent citral block the excitability of rat sciatic nerves BJMBR
Sousa,D.G.; Sousa,S.D.G.; Silva,R.E.R.; Silva-Alves,K.S.; Ferreira-da-Silva,F.W.; Kerntopf,M.R.; Menezes,I.R.A.; Leal-Cardoso,J.H.; Barbosa,R..
Lippia alba is empirically used for infusions, teas, macerates, and hydroalcoholic extracts because of its antispasmodic, analgesic, sedative, and anxiolytic effects. Citral is a mixture of trans-geranial and cis-neral and is the main constituent of L. alba essential oil and possesses analgesic, anxiolytic, anticonvulsant, and sedative effects. The present study evaluated the effects of the essential oil of L. alba (EOLa) and citral on compound action potentials (CAPs) in Wistar rat sciatic nerves. Both drugs inhibited CAP in a concentration-dependent manner. The calculated half-maximal inhibitory concentrations (IC50) of peak-to-peak amplitude were 53.2 µg/mL and 35.00 µg/mL (or 230 µM) for EOLa and citral, respectively. Peak-to-peak amplitude of the CAP...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Citral; Nerve excitability; Lippia alba; Sciatic nerve; Essential oil; Compound action potential.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000800697
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Essential oil of Pterodon polygalaeflorus Benth attenuates nociception in mice BJMBR
Coelho-de-Souza,A.N.; dos-Santos,C.F.; Lopes-Filho,L.N.; Holanda,F.R.; Oliveira,A.C.; Gomes-Vasconcelos,Y.A.; Oliveira,K.A.; Ferreira-da-Silva,F.W.; Silva-Alves,K.S.; Leal-Cardoso,J.H..
Essential oils (EO) are volatile liquids responsible for the aroma of plants. Pterodon polygalaeflorus seeds have received widespread use in folk medicine for the treatment of inflammatory diseases. For this reason and because Pterodon polygalaeflorus seeds have great EO content, which is frequently pharmacologically active, the present study aimed to evaluate the antinociceptive effect of EO from Pterodon polygalaeflorus (EOPPgfl) and its acute toxic effects. The EEOPPgfl sample, which was extracted by steam distillation of the seeds, had a yield of 2.4% of the seeds weight and had, as major constituents, beta-elemene (48.19%), trans-caryophyllene (19.51%), and epi-bicyclosesquiphellandrene (12.24%). The EOPPgfl sample showed mild acute toxicity and its...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Essential oil; Pterodon polygalaeflorus; Antinociception; Anti-inflammatory activities; Beta-elemene; Caryophyllene.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018001100603
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Estragole blocks neuronal excitability by direct inhibition of Na+ channels BJMBR
Silva-Alves,K.S.; Ferreira-da-Silva,F.W.; Peixoto-Neves,D.; Viana-Cardoso,K.V.; Moreira-Júnior,L.; Oquendo,M.B.; Oliveira-Abreu,K.; Albuquerque,A.A.C.; Coelho-de-Souza,A.N.; Leal-Cardoso,J.H..
Estragole is a volatile terpenoid, which occurs naturally as a constituent of the essential oils of many plants. It has several pharmacological and biological activities. The objective of the present study was to investigate the mechanism of action of estragole on neuronal excitability. Intact and dissociated dorsal root ganglion neurons of rats were used to record action potential and Na+ currents with intracellular and patch-clamp techniques, respectively. Estragole blocked the generation of action potentials in cells with or without inflexions on their descendant (repolarization) phase (Ninf and N0 neurons, respectively) in a concentration-dependent manner. The resting potentials and input resistances of Ninf and N0 cells were not altered by estragole...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Estragole; Local anesthetic; Essential oil; Dorsal root ganglia; Phenylpropanoid; Na+ current.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013001201056
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Expression of myo-inositol cotransporters in the sciatic nerve and dorsal root ganglia in experimental diabetes BJMBR
Farias,V.X.; Uchoa,P.N.; Aquino,C.P.; Britto,L.R.G.; Fonteles,M.C.; Leal-Cardoso,J.H.; Silva-Alves,K.S.; Havt,A.; Prata,M.M.G.; Heimark,D.B.; Nascimento,N.R.F.; Santos,C.F..
The transport of myo-inositol is the main mechanism for the maintenance of its high intracellular levels. We aimed to measure the mRNA and protein levels of myo-inositol cotransporters in the sciatic nerve (SN) and dorsal root ganglia (DRG) during experimental diabetes. Streptozotocin-induced (STZ; 4, 8, and 12 weeks; 65 mg/kg; ip) diabetic rats (DB) and age-matched euglycemic (E) rats were used for the analysis of mRNA and protein levels of sodium myo-inositol cotransporters 1, 2 (SMIT1, SMIT2) or H+/myo-inositol cotransporter (HMIT). There was a significant reduction in the mRNA levels for SMIT1 in the SN and DRG (by 36.9 and 31.0%) in the 4-week DB (DB4) group compared to the E group. SMIT2 was not expressed in SN. The mRNA level for SMIT2 was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diabetic neuropathy; Inositol metabolism; Peripheral nervous tissues.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000600609
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