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Articular inflammation induced by an enzymatically-inactive Lys49 phospholipase A2: activation of endogenous phospholipases contributes to the pronociceptive effect J. Venom. Anim. Toxins incl. Trop. Dis.
Dias,Renata Gonçalves; Sampaio,Sandra Coccuzzo; Sant’Anna,Morena Brazil; Cunha,Fernando Queiroz; Gutiérrez,José María; Lomonte,Bruno; Cury,Yara; Picolo,Gisele.
Abstract Background Arthritis is a set of inflammatory conditions that induce aching, stiffness, swelling, pain and may cause functional disability with severe consequences to the patient’s lives. These are multi-mediated pathologies that cannot be effectively protected and/or treated. Therefore, the aim of this study was to establish a new model of acute arthritis, using a Lys49-PLA2 (Bothrops asper myotoxin II; MT-II) to induce articular inflammation. Methods The articular inflammation was induced by MT-II (10 μg/joint) injection into the left tibio-tarsal or femoral-tibial-patellar joints. Cellular influx was evaluated counting total and differential cells that migrated to the joint. The plasma extravasation was determined using Evans blue dye. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lys49-PLA2; Myotoxin II; Arthritis; Bothrops asper; Phospholipase.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992017000100307
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Ausência de efeito antinociceptivo decorrente da administração intravenosa de crotalfina em comparação com morfina, U50-488H ou fenilbutazona em equinos submetidos à estimulação térmica da pele íntegra Ciência Rural
Guirro,Erica Cristina Bueno do Prado; Perotta,João Henrique; Paula,Márcio de; Cury,Yara; Valadão,Carlos Augusto Araújo.
Crotalfina é um novo peptídeo analgésico que atua em receptores opioides kappa e delta promovendo potente analgesia em ratos submetidos a modelos de dor inflamatória, neuropática ou oncológica. Talvez a crotalfina possa ser utilizada para tratar a dor em outras espécies. Assim, o objetivo deste estudo foi avaliar a resposta nociceptiva na região escapular e isquiática de cavalos tratados com crotalfina, morfina, U50-488H ou fenilbutazona e submetidos à estimulação térmica na pele íntegra. Dezoito cavalos da raça Puro Sangue Árabe foram alocados em cinco grupos experimentais: GC (5mL NaCl 0,9%), GCRO (3,8mg.kg-1 crotalfina), GK (160 µg.kg-1 U50-488H), GM (0,1mg.kg-1 morfina) e GF (4,4mg.kg-1 fenilbutazona). Os animais foram submetidos ao modelo de dor...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Analgésicos opioides; Crotalfina; Equinos; Estimulação térmica; Kappa; Nociceptividade.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000400028
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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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Structural determinants of the hyperalgesic activity of myotoxic Lys49-phospholipase A2 J. Venom. Anim. Toxins incl. Trop. Dis.
Zambelli,Vanessa Olzon; Chioato,Lucimara; Gutierrez,Vanessa Pacciari; Ward,Richard John; Cury,Yara.
Abstract Background Bothropstoxin-I (BthTx-I) is a Lys49-phospholipase A2 (Lys49-PLA2) from the venom of Bothrops jararacussu, which despite of the lack of catalytic activity induces myotoxicity, inflammation and pain. The C-terminal region of the Lys49-PLA2s is important for these effects; however, the amino acid residues that determine hyperalgesia and edema are unknown. The aim of this study was to characterize the structural determinants for the Lys49-PLA2-induced nociception and inflammation. Methods Scanning alanine mutagenesis in the active-site and C-terminal regions of BthTx-I has been used to study the structural determinants of toxin activities. The R118A mutant was employed as this substitution decreases PLA2 myotoxicity. In addition, K115A...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lys49-Phospholipase A2; Hyperalgesia; Site-directed mutagenesis; Myotoxic effect; Edema; Membrane damage.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992017000100304
Registros recuperados: 4
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