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Anti-cancer effects of Porphyra haitanensis polysaccharides on human colon cancer cells via cell cycle arrest and apoptosis without causing adverse effects in vitro

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Abstract

In this study, the anticancer effects of Porphyra haitanensis polysaccharides (PHPs) on human colon cancer cells and non-cancerous cells were evaluated. PHP was extracted by an ultrasonic/microwave-assisted method, and three fractions of polysaccharides (PHP-F1, PHP-F2 and PHP-F3) were obtained through a DEAE-52 cellulose ion-exchange column. The results of the cytotoxicity test showed that all of the PHP fractions had inhibitory effects on the growth of colon cancer cells HT-29, LoVo and SW-480, but no toxic effects on the normal human cells HaCaT. The fractions PHP-F2 and PHP-F3 had the most significant cytotoxicity on HT-29 cells. Studies on intracellular reactive oxygen species (ROS) levels, cell apoptosis, the apoptosis index (using Hoechst 33342 staining) and analysis of cell cycle arrest using flow cytometry revealed that the fractions PHP-F2 and PHP-F3 could apparently induce oxidative stress and apoptosis in HT-29 cells and cause cell G0–G1 phase arrest. These findings suggest that polysaccharides from P. haitanensis have anticancer effects on human colon cancer cells and therefore might be regarded as new candidates for the prevention and treatment of colon cancers.

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Acknowledgements

This research was financially supported by grants from the National Natural Science Foundation of China (31901692); Natural Science Foundation of Guangdong Province, China (2018A030310151).

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KLC and XQC conceived and designed the experiments. WZY, SV and HMQ performed the experiment and wrote the manuscript. All authors revised the paper and contributed reagents/materials/analysis tools. All authors reviewed and approved the final manuscript.

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Correspondence to Xian-Qiang Chen or Kit-Leong Cheong.

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No potential conflict of interest was reported by the authors.

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Yao, WZ., Veeraperumal, S., Qiu, HM. et al. Anti-cancer effects of Porphyra haitanensis polysaccharides on human colon cancer cells via cell cycle arrest and apoptosis without causing adverse effects in vitro. 3 Biotech 10, 386 (2020). https://doi.org/10.1007/s13205-020-02379-y

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  • DOI: https://doi.org/10.1007/s13205-020-02379-y

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