Abstract
Calyptranthes tricona is a species (Myrtaceae) native to South Brazil. Plants belonging to this family are folkloric used for analgesia, inflammation, and infectious diseases. However, little is known about the toxic potential of C. tricona. The present study aimed to evaluate the antioxidant activity of C. tricona ethanol and hexane leaf extracts, as well as verify their effect on human lymphocytes and MCF-7 cells. The extracts were subjected to preliminary phytochemical screening, antioxidant activity using DPPH and ORAC methods. Genotoxic and mutagenic effects in cultured human lymphocytes were assessed using the comet assay and the micronucleus assay, respectively. In addition, cell viability by MTT assay and fluorometric analysis of mitochondrial potential and caspases-9 activity were performed in order to verify the possible effects of both extracts on H2O2-induced cell death of MCF-7 cells. Our findings revealed that the phenol content and the antioxidant activity were only present in the ethanol extract. Also, the phytochemical screening presented steroids, triterpenoids, condensed tannins, and flavones as the main compounds. However, both extracts were capable of inducing concentration-dependent DNA damage in human lymphocytes. When treating MCF-7 cells with the extracts, both of them inhibited MCF-7 cell death in response to oxidative stress through a decrease of mitochondrial depolarization and caspases-9 activity. Thus, our results need to be considered in future in vitro and in vivo studies of C. tricona effects. In the meanwhile, we recommend caution in the acute/chronic use of this homemade preparation for medicinal purpose.
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Acknowledgments
We thank Ms. Andréa Horst from the Physiology Department of Universidade Federal do Rio Grande do Sul (UFRGS) and Dr. Adriane Pozzobon from Centro Universitário UNIVATES for technical assistance. This work was supported by Centro Universitário UNIVATES and the National Counsel of Technological and Scientific Development (CNPq). DMK, DF, and SB are the recipients of Master grants and a postdoctoral grant from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Capes), respectively.
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Kich, D.M., Bitencourt, S., Caye, B. et al. Lymphocyte genotoxicity and protective effect of Calyptranthes tricona (Myrtaceae) against H2O2-induced cell death in MCF-7 cells. Mol Cell Biochem 424, 35–43 (2017). https://doi.org/10.1007/s11010-016-2840-9
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DOI: https://doi.org/10.1007/s11010-016-2840-9