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Biocell ; 27(1): 37-46, Apr. 2003.
Article Dans Anglais | LILACS | ID: lil-384252

Résumé

Amphibians respond to microbial infection through cellular and humoral defense mechanisms such as antimicrobial protein secretion. Most humoral defense proteins are synthetized in the skin. In this study we isolated two beta-galactoside-binding lectins with molecular weights of 50 and 56 KDa from the skin of Bufo arenarum. These lectins have significant hemagglutination activity against trypsinized rabbit erythrocytes, which was inhibited by galactose-containing saccharides. They are water-soluble and independent of the presence of calcium. The antimicrobial analysis for each lectin was performed. At mumolar concentration lectins show strong bacteriostatic activity against Gram negative bacteria (Escherichia coli K12 4100 and wild strains of Escherichia coli and Proteus morganii) and Gram positive bacteria (Enterococcus faecalis). The antibacterial activity of these lectins may provide an effective defense against invading microbes in the amphibian Bufo arenarum.


Sujets)
Antibactériens/pharmacologie , Bufo arenarum/métabolisme , Lectines/pharmacologie , Peau/composition chimique , Bactéries à Gram négatif/effets des médicaments et des substances chimiques , Bactéries à Gram positif/effets des médicaments et des substances chimiques , Bufo arenarum/anatomie et histologie , Enterococcus faecalis/effets des médicaments et des substances chimiques , Escherichia coli/effets des médicaments et des substances chimiques , Tests d'hémagglutination , Hémagglutinines/métabolisme , Lactose/métabolisme , Lectines/métabolisme , Proteus/effets des médicaments et des substances chimiques , Lapins
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