Evidence of caspase-mediated apoptosis induced by l-amino acid oxidase isolated from Bothrops atrox snake venom
| Autor: | Helder Henrique Paiva, Raquel Melo Alves, Elaine de Paula Mendonça-Franqueiro, Daniel Junqueira Dorta, Adélia Cristina Oliveira Cintra, José Roberto Giglio, Andreirnar Martins Soares, José César Rosa, João José Franco, Marcelo Dias-Baruffi, Suely Vilela Sampaio, Gilmara Ausech Antonucci, André Lopes Fuly |
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| Rok vydání: | 2008 |
| Předmět: |
Platelet Aggregation
Physiology Molecular Sequence Data Apoptosis HL-60 Cells Peptide In Vitro Techniques L-Amino Acid Oxidase L-amino-acid oxidase PC12 Cells Peptide Mapping Biochemistry Substrate Specificity Cell Line Tumor Animals Humans Bothrops Amino Acid Sequence Cytotoxicity Molecular Biology Peptide sequence Caspase chemistry.chemical_classification biology Caspase 3 Molecular biology Caspase 9 Peptide Fragments Rats Amino acid Enzyme chemistry Snake venom Caspases biology.protein Rabbits Snake Venoms |
| Zdroj: | Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology. 151:542-550 |
| ISSN: | 1095-6433 |
| DOI: | 10.1016/j.cbpa.2008.07.007 |
| Popis: | The aim of this work was to investigate the involvement of caspases in apoptosis induced by l -amino acid oxidase isolated from Bothrops atrox snake venom. The isolation of LAAO involved three chromatographic steps: molecular exclusion on a G-75 column; ion exchange column by HPLC and affinity chromatography on a Lentil Lectin column. SDS-PAGE was used to confirm the expected high purity level of BatroxLAAO. It is a glycoprotein with 12% sugar and an acidic character, as confirmed by its amino acid composition, rich in “Asp and Glu” residues. It displays high specificity toward hydrophobic l -amino acids. The N-terminal amino acid sequence and internal peptide sequences showed close structural homology to other snake venom LAAOs. This enzyme induces in vitro platelet aggregation, which may be due to H2O2 production by LAAOs, since the addition of catalase completely inhibited the aggregation effect. It also showed cytotoxicity towards several cancer cell lines: HL60, Jurkat, B16F10 and PC12. The cytotoxicity activity was abolished by catalase. A fluorescence microscopy evaluation revealed a significant increase in the apoptotic index of these cells after BatroxLAAO treatment. This observation was confirmed by phosphatidyl serine exposure and activation of caspases. BatroxLAAO is a protein with various biological functions that can be involved in envenomation. Further investigations of its function will contribute to toxicology advances. |
| Databáze: | OpenAIRE |
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