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Lebecetin, a novel C-lectin protein from the venom of Macrovipera lebetina that affect platelet aggregation and adhesion of cancerous cells


Authors: Sameh SARRAY, Najet SRAIRI., José LUIS, Jacques MARVALDI, Mohamed EL AYEB and Naziha MARRAKCHI
Abstract: The adhesion receptors of the integrin family play an essential role during tumour progression and thus represent interesting potential targets for the development of new therapeutic agents. The snake venom contains natural inhibitors of integrin–ligand interactions called disintegrins. It also contains C-type lectin proteins mainly known as modulators of platelet aggregation. In this study, we demonstrate that lebectin, a novel C-type lectin isolated from Macrovipera lebetina venom, displayed an anti-integrin activity. Lebectin inhibited the integrin-mediated attachment of various tumour cell lines to different adhesion substrata. The Ctype lectin also completely blocked cell migration towards fibronectin in haptotaxis assays and prevented invasion of fibrin gels by tumour cells. In addition, lebectin proved to be a potent inhibitor of tumour cell proliferation. Although the specific integrins affected by lebectin are not identified in this study, the integrin a5b1 might be involved.
Published in: Haemostasis;31(3):173-176
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