Abstract
In the present study, we aimed to extract, purify, analyze monosaccharide composition of exopolysaccharide (EPS) produced by Halorubrum sp. TBZ112 (KCTC 4203 and IBRC-M 10773) and also to evaluate its possible antiproliferative activity against human gastric cancer (MKN-45) cell line and its biocompatibility effect on normal cells using human dermal fibroblast (HDF) cell line. Average molecular weight and monosaccharide composition were determined by high-pressure size exclusion chromatography (HPSEC) with multi-angle laser light scattering (MALLS) and high-pressure anion exchange chromatography (HPAEC), respectively. Fourier transform infrared (FTIR) spectroscopy was used for the partial characterization of the EPS. The EPS effect on the cell proliferation and viability of MKN-45 and HDF cells was assessed using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and trypan blue dye exclusion, respectively. Strain TBZ112 excreted 480 mg.l−1 of the EPS under optimal growth conditions. The EPS had a molecular weight of 5.052 kDa and was a heteropolysaccharide containing ten moieties mainly composed of mannose (19.95%), glucosamine (15.55%), galacturonic acid (15.43%), arabinose (12.24%), and glucuronic acid (12.05%). No significant difference of the EPS treatments on the proliferation activity of MKN-45 and HDF cells were observed (P > 0.05). For the first time, the EPS from Halorubrum sp. TBZ112, an extremely halophilic archaeon related to Halorubrum genus, was isolated and chemically characterized. The EPS from Halorubrum sp. TBZ112 possesses a relatively low molecular weight and might be applied as a biocompatible compound. More investigations are needed to determine other biological activities of the EPS along with further details of its chemical structure.
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Acknowledgements
This research was performed as an MSc thesis (Number 13) at School of Paramedicene, Guilan University of Medical Sciences (Rasht, Iran). This work was financially supported by the Research Deputy of Guilan University of Medical Sciences (Rasht, Iran).
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MH designed the research. RM, GP, CG, EP, and SF performed the research. M.H., RM, CD, KK, and FK wrote the paper. MH, CD, and KK performed analysis and interpretation of data. All authors discussed the results and participated in the manuscript revision.
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Hamidi, M., Mirzaei, R., Delattre, C. et al. Characterization of a new exopolysaccharide produced by Halorubrum sp. TBZ112 and evaluation of its anti-proliferative effect on gastric cancer cells. 3 Biotech 9, 1 (2019). https://doi.org/10.1007/s13205-018-1515-5
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DOI: https://doi.org/10.1007/s13205-018-1515-5