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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Potencial analg?sico, anti-edematog?nico, antipir?tico e atividade ulcerog?nica de f?rmacos anti-inflamat?rios, em roedores. / Analgesic, antioedematogenic and antipyretic activity and ulcerogenic effects of anti-inflammatory drugs in rodents.

Pires, Priscila Andrade 28 August 2009 (has links)
Made available in DSpace on 2016-04-28T20:18:32Z (GMT). No. of bitstreams: 1 2009 - Priscila Andrade Pires.pdf: 1237061 bytes, checksum: 6489ca08dab0e701c25ed611f45a365e (MD5) Previous issue date: 2009-08-28 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Nonsteroidal anti-inflammatory drugs (NSAID) are widely using in veterinary medicine, having analgesic and anti-inflammatory activity, including reduction of oedema and antipyretic actions. They inhibit the cyclooxygenase enzime (COX). There are two isoforms of COX that are responsible for synthesis of prostaglandins. The COX I is usually a constitutive enzyme expressed in tissues. Prostaglandins, prostacyclin, and thromboxane synthesized by this enzyme are responsible for normal physiologic functions. COX II, on the other hand, is inducible and synthesized by inflammatory cells after stimulation by cytokines and other mediators of inflammation. In some tissues COX II may be constitutive as central nervous system and kidney. All NSAID can cause adverse side effects and their selective degree will be important for the ocurrence of undesirable reaction. The aim of this study was to evaluate the analgesic, antioedematogenic and antipyretic activity of some antiinflammatory used in veterinary clinics, the nonselective drugs, flunixin meglumine (FM) and ketoprofen (CT); the COX II preferential, meloxicam (MX) and carprofen (CP); and COX II selective, firocoxib, after oral administration, as well as their ulcerogenic activity in gastric mucosa, allowing a comparative analyses of their antinociceptive and/or anti-inflammatory actions and their adverse side effects, helping veterinary doctor in the choose of the drug that have better relation cost/risk/benefit of this drugs. To assess the antioedematogenic effect in croton oil-induced mice ear oedema method, the CT (ID50: 3,6 mg/kg) was the most potent drug, followed by CP and FM (ID50: 12,3 and 17,8 mg/kg, respectively). The MX and FC, despite of their effectiveness, showed low activity, didn t producing sufficient effects for determination the ID50 in maximal dose (30 mg/kg). In LPS induced fever in rats, the FC produced antipyretic activity with ID50 2,9 mg/kg, accompanied by CT, CP and FM (ID 50: 3,3; 3,6 and 4 mg/kg, respectively) and with greater dose of meloxicam (ID 50: 30 mg/kg). Evaluating the antinociceptive effect in the acetic acid-induced abdominal writhing model of analgesia in mice, the MX was the most effective drug (ID50: 0,09 mg/kg), followed by FM, FC, CP and CT (ID50: 0,4; 1,9; 2,3; 3,6, respectively), and using this ID50 in the evaluation of ulcerogenic action of this drugs in mice, the FC, FM and MX didn t induce significative gastric injury in 3o and 7o day of treatment. The CT and CP induced ulceration in 3o day, being the CT most intense. However in 7o day, we didn t notice gastric injury, suggesting that adapted gastric mucosa produces increased resistance to subsequent damage by this class of drugs. This results reveal that analgesic activity of almost all of this NSAID is independent of this antiodematogenic and antipyretic actions. The CT has similar ID50 in all pharmacological assays in this study. The gastric ulcerogenic activity has inverse ratio when compared with analgesic effects. / Os anti-inflamat?rios n?o esteroidais (AINES) s?o drogas amplamente usadas na medicina veterin?ria, tendo a??o analg?sica, anti-inflamat?ria, incluindo a redu??o do edema e antipir?tica. Agem inibindo a enzima cicloxigenase (COX), n?o havendo a forma??o de prostan?ides, e os efeitos colaterais promovidos pelos AINES tornam limitante o seu uso. H? duas isoformas de COX: a COX-I, constitutivamente nos tecidos e respons?vel pelas fun??es fisiol?gicas; e a COX-II, induzida ap?s est?mulos inflamat?rios, ?lgicos e t?rmicos. Dessa forma, entendeu-se que o uso de AINES seletivos para a COX-II, diminuiria os efeitos adversos desses f?rmacos, uma vez que garantiria as fun??es homeost?ticas da COX-I. Atualmente, sabe-se que a COX-II tamb?m est? presente constitutivamente em alguns tecidos como o sistema nervoso central e rim. Dessa forma, todos os AINEs podem causar efeitos adversos em maior ou menor intensidade, e o grau de seletividade de cada f?rmaco ser? determinante na ocorr?ncia de rea??es indesej?veis. O objetivo desse trabalho foi avaliar o potencial analg?sico, anti-edematog?nico e antipir?tico dos principais AINES utilizados em medicina veterin?ria, os COX n?o seletivos flunixim meglumine (FM) e cetoprofeno (CT); os COX-II preferenciais meloxicam (MX) e carprofeno (CP) e o COX-II seletivo firocoxibe (FC) ap?s a administra??o oral, bem como a atividade ulcerog?nica sobre a mucosa g?strica, tendo-se assim uma avalia??o comparativa tanto de seu efeito antinociceptivo e/ou antiinflamat?rio, como de rea??es indesej?veis; subsidiando o m?dico veterin?rio cl?nico, no estabelecimento da rela??o custo/benef?cio desses f?rmacos. No teste do edema de orelha induzido pelo ?leo de cr?ton em camundongos, o CT (ID50 = 3,6 mg/kg) foi ? droga mais potente, seguido do CP e FM (ID50 = 12,3 e 17,8 mg/kg, respectivamente). O MX e FC, apesar de efetivos, mostraram baixa atividade n?o produzindo efeito suficiente com a dose m?xima de 30mg/kg, para a determina??o da ID50. Na febre induzida pelo LPS em ratos, o FC produziu atividade antipir?tica com ID50 = 2,9 mg/kg, acompanhado do CT, CP e FM (ID50 = 3,3; 3,6 e 4 mg/kg, respectivamente) e com maiores doses do MX (ID50 = 17,8 mg/kg). Avaliando o potencial analg?sico pelo m?todo das contor??es abdominais com ?cido ac?tico em camundongos, o MX foi o mais potente (ID50 = 0,09 mg/kg), seguido do FM, FC, CP e CT (ID50 = 0,4; 1,9; 2,3 e 3,6 mg/kg, respectivamente) e, utilizando estas ID50 na avalia??o da atividade ulcerog?nica em camundongos, o FC, FM e MX n?o produziram efeitos g?stricos significativos no 3? ou no 7? dia dos tratamentos. O CT e o CP promoveram ulcera??es no 3? dia, sendo o CT de forma mais intensa; n?o se observando altera??es g?stricas no 7? dia, podendo esse efeito estar relacionado ao desenvolvimento de toler?ncia aos danos causados por essa classe de drogas na mucosa. Esses resultados revelam que a atividade analg?sica da quase totalidade desses f?rmacos independe da atividade antiedematog?nica e antipir?tica, tendo o CT revelado ID50 semelhantes em todos os testes farmacol?gicos. A atividade ulcerog?nica g?strica evidenciada, teve rela??o inversa com a atividade analg?sica de todos esses f?rmacos.

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