Hossein Riahi - Professor, Faculty of biological Sciences and Biotechnology, Shahid Beheshti university
pardis Irankhahi - Department of Plant Sciences and Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University,Tehran, Iran.
Zeinab Aghashariatmadari - Faculty of biology Sciences and Biotechnolgy, Shahid Beheshti university, Tehran
Neda Soleimani - Department of Microbiology and Microbial Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University,Tehran, Iran.
Zeinab Aghashariatmadar

Cyanobacteria produce a wide range of biologically active compounds. Among the cyanobacterial metabolites, cytotoxins are of particular interest because of their potential to kill target cancer cells. The present study was undertaken to isolate Nodularia harveyana from Ardakan County (Yazd Province, Iran) soil and determine the cytotoxic effect of cytoplasmic extract and medium culture of its on the human melanoma cell line. Nitrate-free BG۱۱ medium was used for preparing an axenic monoalgal culture of Nodularia harveyana ISB۱۱۲. In addition, ۳- to ۵-week-old cytoplasmic extraction and medium were used for the cytotoxic study on human melanoma cell lines (B۱۶). The cytotoxic effects of cytoplasmic extract, and medium culture at the concentration ranging from ۵ to ۵۰ μg.ml-۱ increased significantly in a concentration-dependent manner (p<۰.۰۵). The ۴- and ۵-week-old cytoplasmic extract of Nodularia harveyana ISB۱۱۲ was more effective than the ۳-week-old extract and the viability percent of cells were ۵۲.۵۷% and ۵۲.۳۵%, respectively. The results showed that the medium culture activity in the fifth week of growth was higher than other periods and the cell's viability percent was ۴۸.۸۴% (p ≤ ۰.۰۵). Overall, the results suggested that Nodularia harveyana ISB۱۱۲ could kill tumor cells that can be used as a treatment for cancer disease.

Nodularia harveyana, Cyanobacteria, Cytotoxic, Cytoplasmic extract