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Master's Dissertation
DOI
https://doi.org/10.11606/D.87.2009.tde-22122009-104551
Document
Author
Full name
Anderson Daniel Ramos
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2009
Supervisor
Committee
Ferreira, Mônica Valdyrce dos Anjos Lopes (President)
Haddad Júnior, Vidal
Spencer, Patrick Jack
Title in Portuguese
Caracterização bioquímica e biológica de toxinas presentes na peçonha e no muco do bagre Cathorops spixii.
Keywords in Portuguese
Bagre marinho
Biotecnologia
Muco
Peixes venenosos
Toxinas
Venenos
WAP 65
Abstract in Portuguese
Dos peixes peçonhentos encontrados no Brasil os bagres destacam-se pelo número de acidentes provocados. O objetivo deste trabalho foi caracterizar os componentes tóxicos presentes na peçonha e no muco. Obtivemos uma média protéica de 3,1 mg/mL (peçonha) e 1,4 mg/mL (muco). O perfil eletroforético da peçonha e do muco possui poucas bandas protéicas. O fracionamento isolou 11 frações para peçonha e 13 frações para o muco. Com relação às atividades biológicas avaliadas, as frações peptídicas induziram danos teciduais ao passo que as frações protéicas induziram processo inflamatório. Isolamos duas frações com atividade antimicrobiana para cada secreção. Isolamos uma toxina de 65,1 kDa que apresenta homologia com Wap65 e análise por microscopia intravital revelou que esta proteína causa aumento dos leucócitos rolantes assim como a presença de leucócitos aderidos ao endotélio. Nossos resultados indicam uma diferença entre os componentes protéicos e peptídicos do muco e da peçonha. Finalmente, conseguimos isolar e caracterizar a proteína Wap65 da peçonha deste peixe.
Title in English
Biochemical and biological characterization of toxins in the venom and mucus of the catfish Cathorops spixii.
Keywords in English
Biotechnology
Marine catfish
Mucus
Nenomous fishes
Toxins
Venoms
WAP65
Abstract in English
Of the venomous fish found in Brazil, catfish noteworthy for the number of accidents they cause. The objective of this study was to characterize the toxic compounds present in the venom and mucus. We obtained an average protein intake of 3,1 mg / mL (venom) and 1,4 mg / mL (mucus). The electrophoretic profile of venom and mucus has a few protein bands. Fractionation isolated 11 fractions to the venom and 13 fractions to the mucus. With respect to biological activities evaluated, the peptide fractions induced tissue damage while the protein fractions induced inflammation. We isolated two fractions with antimicrobial activity for each sample. We isolated a toxin of 65,1 kDa which shows homology with Wap65 and intravital microscopy analysis revealed that this protein causes an increase in leukocyte rolling as well as the presence of leukocytes adhered to the endothelium. Our results indicate a difference between the peptide and protein components of mucus and venom. Finally, we isolate and characterize the protein Wap65 from the venom of this fish.
 
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Publishing Date
2010-02-18
 
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