Abstract
The cytotoxic, antibacterial, and antifungal activities of cyanobacterium Gloeocapsa sp. strain Gacheva 2007/R-06/1 were investigated and the possibility for an enhancement of these activities by changing the culture conditions evaluated. Fatty acids of this cyanobacterium were found to be active against Streptococcus pyogenes. Exopolysaccharides inhibited the growth of both Gram-positive and Gram-negative bacteria and the fungus Candida albicans. Both exopolysaccharides and fatty acid mixtures also significantly decreased the viability of human cervical carcinoma cells, HeLa. Greater biological activities were exhibited by Gloeocapsa sp., cultured at suboptimal temperatures (15–26°C) than at optimal and supraoptimal ones. In comparison with higher light intensity, the low-light cultivation stimulated the cytotoxicity of the fatty acids. In general, low temperatures decreased the growth of Gloeocapsa sp., but promoted its biological activity. Prolonged cultivation also had a beneficial impact on the bioactivity. Compared to 4 days, the 17-day cultivation resulted in fourfold higher antibacterial and antifungal activities of exopolysaccharides and more than twice increases in their cytotoxicity. The study revealed that this cyanobacterial isolate is a new source of natural products with potential for pharmacological and medical applications.
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Acknowledgments
This work was supported by research grants D002-299/2008 and DMU-02/2 from the National Science Fund, Ministry of Education, Youth and Science, Bulgaria. The authors are grateful to Mrs. Iva Tsvetkova for her excellent technical assistance during antibacterial and antifungal screening.
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Gacheva, G., Gigova, L., Ivanova, N. et al. Suboptimal growth temperatures enhance the biological activity of cultured cyanobacterium Gloeocapsa sp.. J Appl Phycol 25, 183–194 (2013). https://doi.org/10.1007/s10811-012-9852-y
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DOI: https://doi.org/10.1007/s10811-012-9852-y