Abstract
Dialysed latex C-serum supernatant (DCS) sub-fraction from the rubber tree (Hevea brasiliensis) was reported to exert significant anti-proliferative effect on specific cancer cell lines, especially in human triple negative breast cancer (MDA-MB-231) and human liver carcinoma (HepG2) cells. In the present study, two human non-cancer origin cell lines, MCF-10A (human breast epithelial cells) and HDFa (human adult dermal fibroblast cells), showed least susceptibility when treated with DCS sub-fraction at concentration range 0–100 µg/mL using 2,5-diphenyl tetrazolium bromide (MTT) assay. Genotoxicity of DCS sub-fraction was assessed through Ames test, in vitro mouse lymphoma assay, and in vitro micronucleus assay. All genotoxicity experiments were tested with the presence and absence of S9 mixture as metabolic activation system. Ames test results showed negative result of mutagenicity as no clear dose-dependent relationship was observed despite mutagenic potential was detected in frame shift-based TA98 and TA1535 Salmonella typhimurium strains. Mouse lymphoma assay produced non-linear dose-dependent effect in experiments without the presence of S9. Meanwhile, experiment with the presence of S9 resulted in an inverse effect of the dose-dependent relationship. In micronucleus assay, the dose-dependent cytotoxicity effect of DCS sub-fraction showed no correlation with the increase number of cells containing micronuclei but appeared to be time-dependent. In conclusion, DCS sub-fraction showed no significant positive results in genotoxicity assays. In vivo genotoxicity assays should be conducted to ensure the safe use of DCS sub-fraction in further exploration for biological applications.
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Acknowledgements
This work was supported by Rubber Research Institute Malaysia (RRIM) [under research project SEAC S13BTP0460]; and the Universiti Sains Malaysia (USM), Penang Malaysia Fundamental Research Grant Scheme (FRGS) (FRGS/1/2014/SG03/USM/02/1).
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YKL, OMT, and SS designed and performed the experiments, processed experimental data, and wrote the manuscript. YKL and SS performed the statistical analyses and assisted in manuscript writing. ES and ARN assisted in result interpretation. SS, OMT, and ES supervised the project. All authors discussed the results and contributed to the manuscript.
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Lee, Y.K., Thong, O.M., Sunderasan, E. et al. Cytotoxicity and genotoxicity of Hevea brasiliensis latex C-serum DCS sub-fraction as anticancer agents. J Rubber Res 23, 273–285 (2020). https://doi.org/10.1007/s42464-020-00056-6
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DOI: https://doi.org/10.1007/s42464-020-00056-6