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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2010.tde-25032010-151949
Document
Author
Full name
Pollyana Cristina Maggio de Castro Souto
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2010
Supervisor
Committee
Teixeira, Catarina de Fatima Pereira (President)
Ferreira, Mônica Valdyrce dos Anjos Lopes
Sampaio, Sandra Coccuzzo
Title in Portuguese
Caracterização da reação inflamatória induzida pelo veneno da serpente Bothrops insularis: Influxo leucocitário, liberação de mediadores inflamatórios e mecanismos envolvidos nesses efeitos
Keywords in Portuguese
Bothrops insularis
Ciclooxigenases
Eicosanóides
Leucócitos
Lipooxigenases
Abstract in Portuguese
Este estudo teve por objetivos: i) caracterizar o influxo leucocitário induzido pelo veneno de Bothrops insularis (VBi); ii) avaliar a liberação de PGD2 e PGE2, TXA2 e LTB4 e das quimiocinas MCP-1 e KC induzida pelo VBi; iii) analisar a ação do VBi quanto a expressão protéica das enzimas ciclooxigenases (COX -1 e -2) e iv) avaliar a participação dos metabólitos das COX-1 e -2 e 5-LO no influxo leucocitário. O VBi causou aumento de leucócitos circulantes e do influxo de leucócitos PMN e MN para o local de sua injeção. Ainda, veneno induziu a liberação de PGD2, PGE2, TXA2 e LTB4, da MCP-1, mas não da KC, além da expressão protéica de COX-2. O tratamento dos animais com indometacina, etoricoxibe ou zileuton inibiu o influxo de leucócitos induzido pelo VBi na 12ª h. Em conclusão, o VBi tem capacidade de induzir influxo de leucócitos e liberação de mediadores inflamatórios para o local de sua injeção. O influxo leucocitário relaciona-se aos metabólitos das COX -1 e -2, 5-LO, da MCP-1 e do aumento de leucócitos circulantes
Title in English
Characterization of the inflammatory reaction induced by Bothrops insularis snake venom: leukocyte influx, release of inflammatory mediators and mechanisms involved in this effects
Keywords in English
Bothrops insularis
Ciclooxygenases
Eicosanoids
Leukocytes
Lipooxygenases
Abstract in English
In this study the effects of Bothrops insularis venom (BiV) on the leukocyte influx, on the circulating leukocyte numbers and release of mediators, such as PGD2, PGE2, TXA2, LTB4, MCP-1 and KC into the local of its injection. Moreover, the role of eicosanoids in the BiV- induced leukocyte influx was assessed by selected pharmacological treatments. PMN were accumulated from 6 up to 24 h and MN cells from 3 up to 72 h when injected into the peritoneal cavity of mice. Moreover, BiV increased blood leukocyte at 3 h after injection and incresed the levels of PGD2, PGE2, TXA2, LTB4, MCP-1 at distinct periods of time. In addition, BiV induced the protein expression of COX-2 from 1 up to 12 h and the BiV-induced leukocyte influx was reduced by indomethacin or etoricoxib or zileuton at 12 h after injection. In conclusion, BiV is able to induce leukocyte influx and increase of blood leukocyte numbers. Moreover, the ability of BiV to induce expression of COX-2 and release of inflammatory mediators is relevant for the leukocytes influx into the local of its injection
 
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Publishing Date
2010-03-29
 
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