Ontology type: schema:ScholarlyArticle
2019-12
AUTHORSMonique Meyenberg Cunha-de Padua, Guilhermina Rodrigues Noleto, Carmen Lucia de Oliveira Petkowicz, Silvia Maria Suter Correia Cadena, Frédéric Bost, Jacques Pouysségur, Nathalie M. Mazure
ABSTRACTBackground: Polysaccharides from various sources have been used in traditional medicine for centuries. The beneficial pharmacological effects of plant-derived polysaccharides include anti-tumor activity. Methods: Here, we evaluated the anti-cancer effect of the MSAGM:VO complex under hypoxic conditions (1% oxygen). MSAGM:VO is a complex of the hydrolysate of galactomannan (MSAGM) from Schizolobium amazonicum with oxovanadium (IV/V). The hepatocellular carcinoma (HCC) cell line HepG2 was selected as HCC are one of the most hypoxic solid tumors. Results: Our results showed that the strong apoptotic activity of MSAGM:VO observed in HepG2 cells under normoxic conditions was completely lost under hypoxic conditions. We found a dynamic balance between the pro- and anti-apoptotic members of the Bcl-2 protein family. The expressions of anti-apoptotic Mcl-1 and Bcl-XL increased in hypoxia, whereas the expression of pro-apoptotic Bax decreased. MSAGM:VO strongly induced autophagy, which was previously characterized as a pro-survival mechanism in hypoxia. These results demonstrate total elimination of the anti-cancer activity of MSAGM:VO with activation of autophagy under conditions of hypoxia. Conclusion: Although this study is a proof-of-concept of the impact of hypoxia on the potential of polysaccharides, further study is encouraged. The anti-tumor activity of polysaccharides could be achieved in normoxia or through raising the activity of the immune system. In addition, combination strategies for therapy with anti-autophagic drugs could be proposed. More... »
PAGES18
http://scigraph.springernature.com/pub.10.1186/s11658-019-0135-3
DOIhttp://dx.doi.org/10.1186/s11658-019-0135-3
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/30949212
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