Angiostatin-like molecules are generated by snake venom metalloproteinases

Angiostatin is a plasminogen-derived anti-angiogenic factor composed of its first four kringle structures. This molecule is generated by proteolytic cleavage of plasminogen by some proteolytic enzymes in vitro. Since venoms of viper snakes are a rich source of both serine- and metalloproteinase, we...

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Veröffentlicht in:Biochemical and biophysical research communications 2002-06, Vol.294 (4), p.879-885
Hauptverfasser: Ho, Paulo Lee, Serrano, Solange Maria de Toledo, Chudzinski-Tavassi, Ana Marisa, da Silva, Ana Maria Moura, Mentele, Reinhard, Caldas, Cristina, Oliva, Maria Luiza Vilela, Batista, Isabel de Fátima Correia, de Oliveira, Maria Leonor Sarno
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Sprache:eng
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Zusammenfassung:Angiostatin is a plasminogen-derived anti-angiogenic factor composed of its first four kringle structures. This molecule is generated by proteolytic cleavage of plasminogen by some proteolytic enzymes in vitro. Since venoms of viper snakes are a rich source of both serine- and metalloproteinase, we hypothesized that angiostatin-like polypeptides could be generated during the envenomation after snake bites and play a pathophysiological role in the local tissue damage and regeneration. Our results showed that crude venoms from several species of Bothrops snakes were able to generate angiostatin-like polypeptides and purified metalloproteinases but not serine proteinases from Bothrops jararaca and Bothrops moojeni venoms were responsible for their generation in vitro. The putative plasminogen cleavage sites by the crude venoms and purified proteinases were determined by N-terminal amino acid sequencing of the angiostatin-like molecules. Angiostatin-like peptides derived from human plasminogen digestion by jararhagin, a metalloproteinase isolated from B. jararaca venom, inhibited endothelial cell proliferation in vitro. These results indicate that angiostatin-like molecules can be generated upon snakebite envenomations and may account for the poor and incomplete regenerative response observed in the damaged tissue.
ISSN:0006-291X
1090-2104
DOI:10.1016/S0006-291X(02)00567-3