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Clinical, behavioral and antinociceptive effects of crotalphine in horses Ciência Rural
Guirro,Erica Cristina Bueno do Prado; Perotta,João Henrique; Paula,Márcio de; Cury,Yara; Valadão,Carlos Augusto Araújo.
ABSTRACT: Crotalphine is a novel analgesic peptide that acts on kappa opioid and delta receptors, causing powerful analgesia in rats submitted to inflammatory, neuropathic or oncologic models of pain. This study evaluated clinical, behavioral and antinociceptive effects caused by crotalphine in horses, employing 18 Arabian horses and it was divided in three phases. In Phase I, "clinical and behavioral effects", crotalphine did not change the latency to urinate and defecate; did not modify the values of cardiac or respiratory rates, intestinal motility and rectal temperature; and did not cause significant ataxia, head, eye and lip ptosis. In Phase II, "antinociceptive effect on intact skin at scapular or ischial region", crotalphine did not cause...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crotalphine; Horses; Kappa; Nociception; Opioids.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000400694
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Comparison of the sedative effects of morphine, meperidine or fentanyl, in combination with acepromazine, in dogs Ciência Rural
Gomes,Viviane Horta; Monteiro,Eduardo Raposo; Dias,Raquel Sartori; Oliveira,Renato Leão Sá de; Silva,Marta Fernanda Albuquerque da; Coelho,Karina.
This study aimed to compare the sedative effects of morphine, meperidine and fentanyl, in combination with acepromazine (ACP) and their effects on physiologic values in dogs. Six healthy beagle dogs were randomly assigned to four treatments with 7-day washout intervals. In three treatments, ACP (0.05mg kg-1) was administered and 20 minutes later, the dogs received administration of 0.5mg kg-1 of morphine (ACPMOR), 5mg kg-1 of meperidine (ACPMEP) or 5µg kg-1 of fentanyl (ACPFEN). In treatment ACP HD MOR, 0.1mg kg-1 of ACP was administered in combination with 0.5mg kg-1 of morphine. All drugs were administered intravenously. Sedation scores were evaluated by a numeric descriptive scale (NDS: 0-3) and a simple numeric scale (SNS: 0-10). All variables were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sedation; Opioids; Phenothiazines.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000800018
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Endogenous opiate analgesia induced by tonic immobility in guinea pigs BJMBR
Leite-Panissi,C.R.A.; Rodrigues,C.L.; Brentegani,M.R.; Menescal-de-Oliveira,L..
A function of the endogenous analgesic system is to prevent recuperative behaviors generated by tissue damage, thus preventing the emission of species-specific defensive behaviors. Activation of intrinsic nociception is fundamental for the maintenance of the behavioral strategy adopted. Tonic immobility (TI) is an inborn defensive behavior characterized by a temporary state of profound and reversible motor inhibition elicited by some forms of physical restraint. We studied the effect of TI behavior on nociception produced by the formalin and hot-plate tests in guinea pigs. The induction of TI produced a significant decrease in the number of flinches (18 ± 6 and 2 ± 1 in phases 1 and 2) and lickings (6 ± 2 and 1 ± 1 in phases 1 and 2) in the formalin test...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tonic immobility; Guinea pig; Antinociception; Opioids; Naloxone; Analgesia.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000200013
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Envolvimento dos opióides endógenos sobre o controle do hormônio luteinizante (LH) em ovelhas hipoglicêmicas e ovariectomizadas. Repositório Alice
ELOY, A. M. X.; RODWAY, R..
1997
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Receptores opióides; Luteinizing hormone; Opioids; Ovino; Ovelha; Hormônio; Sheep; LH; Receptors.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/514860
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Fluorescent ligands for studying neuropeptide receptors by confocal microscopy BJMBR
Beaudet,A.; Nouel,D.; Stroh,T.; Vandenbulcke,F.; Dal-Farra,C.; Vincent,J.-P..
This paper reviews the use of confocal microscopy as it pertains to the identification of G-protein coupled receptors and the study of their dynamic properties in cell cultures and in mammalian brain following their tagging with specific fluorescent ligands. Principles that should guide the choice of suitable ligands and fluorophores are discussed. Examples are provided from the work carried out in the authors' laboratory using custom synthetized fluoresceinylated or BODIPY-tagged bioactive peptides. The results show that confocal microscopic detection of specifically bound fluorescent ligands permits high resolution appraisal of neuropeptide receptor distribution both in cell culture and in brain sections. Within the framework of time course experiments,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Neurotensin; Somatostatin; Opioids; Internalization; Endocytosis; Confocal microscopy.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998001100017
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Identification of multi-drug resistance gene (MDR1) in equine ileum Ciência Rural
Natalini,Cláudio Corrêa; Linardi,Renata Lehn.
P-glycoprotein (P-gp) is a membrane transporter encoded in the Multi-drug Resistance (MDR1) gene expressed in several normal tissues and over expressed in tumor cells. P-gp was already identified in different species but not yet in equine. MDR1 gene and P-gp are able to interfere with bioavailability and disposition of several drugs, altering pharmacokinetic and pharmacodinamic of drugs. The presence of the MDR1 and P-gp in the central nervous system blocks the entry of certain drugs in this tissue and reduces drug absorption and enhances drug elimination when P-gp and MDR1 are presented in the gastrointestinal tract. This study showed that the MDR1 gene is present in equine ileum. Future studies on the impact of the P-glycoprotein encoded gene MDR1 on...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Molecular biology; Opioids; Equine; Gene; MDR1; ABCB1.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782006000100048
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Involvement of calcium in pain and antinociception BJMBR
Prado,W.A..
Calcium ions are widely recognized to play a fundamental role in the regulation of several biological processes. Transient changes in cytoplasmic calcium ion concentration represent a key step for neurotransmitter release and the modulation of cell membrane excitability. Evidence has accumulated for the involvement of calcium ions also in nociception and antinociception, including the analgesic effects produced by opioids. The combination of opioids with drugs able to interfere with calcium ion functions in neurons has been pointed out as a useful alternative for safer clinical pain management. Alternatively, drugs that reduce the flux of calcium ions into neurons have been indicated as analgesic alternatives to opioids. This article reviews the manners by...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antinociception; Analgesia; Calcium ions; Calcium antagonists; Opioids.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000400003
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Minimum alveolar concentration of isoflurane in dogs administered two morphine doses Ciência Rural
Coelho,Karina; Monteiro,Eduardo Raposo; Bressan,Thais Feres; Monteiro,Betânia Souza; Campagnol,Daniela; Alievi,Marcelo Meller.
ABSTRACT: This study aimed to evaluate the effects of intramuscular 0.5mg kg-1 (MOR0.5) and 1.0mg kg-1 (MOR1.0) morphine premedication on the minimum alveolar concentration of isoflurane (ISOMAC) in dogs. Eighteen client-owned female dogs were scheduled for elective ovariohysterectomy. Dogs received intramuscular MOR0.5 or MOR1.0 as premedication and propofol IV for induction of anesthesia. Isoflurane was delivered for maintenance of anesthesia and dogs were maintained under normocapnia and normothermia. Determinations of the ISOMAC were conducted by use of the “up-and-down” method. Noxious stimulus (placement of Backhaus towel clamps, a midline skin incision and subcutaneous tissue dissection) was delivered approximately 50 minutes after premedication...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Autonomic response; Canine; Inhalational anesthetics; Opioids.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017001100601
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Multi-drug resistance gene (MDR1) and opioid analgesia in horses Ciência Rural
Natalini,Cláudio Corrêa; Cunha,Anderson Fávaro da; Linardi,Renata Lehn.
Opioid absorption in the intestinal tract as well as its effects in the central nervous system is modulated by the P-glycoprotein (P-gp) encoded in the Multi-drug Resistance gene (MDR1) also named ATP-binding cassete, subfamily B, member 1 (ABCB1). This MDR1 gene acts as a selective pump. The expression of this protein in humans and rodents inhibits cellular uptake of substrate opioids. The presence of the intestinal iso-enzyme CYP3A4 associated with MDR1 gene decreases the opioid analgesic activity due to an increase in intestinal metabolism, with a predicted intestinal first pass extraction around 20% which significantly influences the oral availability of opioids. In the central nervous system, P-gp expression decreases opioid neuronal uptake...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Molecular biology; Opioids; Equine; Gene; MDR1; ABCB1; Analgesia.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782006000100055
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New perspective on the pathophysiology of panic: merging serotonin and opioids in the periaqueductal gray BJMBR
Graeff,F.G..
Panic disorder patients are vulnerable to recurrent panic attacks. Two neurochemical hypotheses have been proposed to explain this susceptibility. The first assumes that panic patients have deficient serotonergic inhibition of neurons localized in the dorsal periaqueductal gray matter of the midbrain that organize defensive reactions to cope with proximal threats and of sympathomotor control areas of the rostral ventrolateral medulla that generate most of the neurovegetative symptoms of the panic attack. The second suggests that endogenous opioids buffer normal subjects from the behavioral and physiological manifestations of the panic attack, and their deficit brings about heightened suffocation sensitivity and separation anxiety in panic patients, making...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Panic; Animal model; Periaqueductal gray; Serotonin; Opioids.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012000400011
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Opiatergic participation in the thirst-inhibiting effect of acute third ventricle injections of cadmium (Cd2+) and lead (Pb2+) BJMBR
De-Castro-e-Silva,E.; Luz,C.P.; Sarmento,C.; Nascimento,T.; Gonzalez,V.; Marinho,C.A.; Castro,L.; Oliveira,P.; Santana Jr.,P.; De-Oliveira,I.R.; De-Paula,S.; Lima,A.K.S.; Fregoneze,J.B..
We have previously demonstrated that acute third ventricle injections of both lead and cadmium prevent the dipsogenic response elicited by dehydration or by central injections of dipsogenic agents such as angiotensin II, carbachol and isoproterenol in rats. We have also shown that the antidipsogenic action of cadmium may be due, at least in part, to activation of thirst-inhibitory central serotonergic pathways. In the present paper we show that in Wistar male rats the antidipsogenic effect of both lead acetate (3.0 nmol/rat) and cadmium chloride (3.0 nmol/rat) may be partially dependent on the activation of brain opiatergic pathways since central injections of naloxone (82.5 nmol/rat), a non-selective opioid antagonist, blunt the thirst-inhibiting effect...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Cadmium; Lead; Water intake; Opioids; Rats.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000600013
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Plasma and cerebrospinal fluid alfentanil, butorphanol, and morphine concentrations following caudal epidural administration in horses Ciência Rural
Natalini,Cláudio Corrêa.
This study was conducted with the objective of determining the plasma and cerebrospinal fluid (CSF) concentrations after epidurally administered alfentanil, butorphanol, and morphine in horses. Five clinically healthy adult horses were studied. Morphine 0.1mg kg-1, alfentanil 0.02mg kg-1, and butorphanol 0.08mg kg-1 in equal volumes (20ml) were epidurally injected. A 10-ml sample of CSF and blood were drawn at sampling times before the epidural administration and at 5, 10, 20, 30, 40, 50, 60 and 120 minutes, and hourly for 24 hours Enzyme-linked immonosorbent assay (ELISA) was used as the screening test to detect the injected opioids. ANOVA and Bonferroni’s test were used with a P values <0.05 considered significant. The ELISA method was used and seemed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Analgesia; Opioids; Pharmacokinetics; Equine; Epidural.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782006000500014
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Zinc and water intake in rats: investigation of adrenergic and opiatergic central mechanisms BJMBR
Fregoneze,J.B.; Luz,C.P.; Castro,L.; Oliveira,P.; Lima,A.K.S.; Souza,F.; Maldonado,I.; Macêdo,D.F.; Ferreira,M.G.; Bandeira,I.P.V.; Rocha Jr.,M.A.; Carvalho,F.L.Q.; De-Castro-e-Silva,E..
We have demonstrated that central administration of zinc in minute amounts induces a significant antidipsogenic action in dehydrated rats as well as in rats under central cholinergic and angiotensinergic stimulation. Here we show that acute third ventricle injections of zinc also block water intake induced by central ß-adrenergic stimulation in Wistar rats (190-250 g). Central inhibition of opioid pathways by naloxone reverses the zinc-induced antidipsogenic effect in dehydrated rats. After 120 min, rats receiving third ventricle injections of isoproterenol (160 nmol/rat) exhibited a significant increase in water intake (5.78 ± 0.54 ml/100 g body weight) compared to saline-treated controls (0.15 ± 0.07 ml/100 g body weight). Pretreatment with zinc (3.0,...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Zinc; Isoproterenol; Opioids; Thirst; Naloxone; Rats.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001000007
Registros recuperados: 13
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