1887

Abstract

Purpose. To investigate the efficiency of natural astaxanthin that has been extracted from Xanthophyllomyces dendrorhous in inhibiting the proliferation and viability of colorectal adenocarcinoma cell line (Caco-2; colon cancer cells).

Methodology. Caco-2 cells and normal human oralkeratinocytes (NOKs) were treated with different concentrations of extracted astaxanthin, ranging from 0.075 to 10 mg ml, for 24, 48 and 72 h. The number of cells was determined via MTS assay and the proliferating cells were investigated by bromodeoxyuridine (BrdU) assay.

Results/Key findings. Of the Caco-2 cells, 30–50 % remained viable, while the NOKs showed 110–120 % survival when treated with 5 mg ml astaxanthin. The Caco-2 cells showed distinct structural shrinkage when treated with the same concentration of astaxanthin. Fluorescent labelling of the DNA of the proliferative cells with BrdU showed a significant decrease in the number of the proliferative Caco-2 cells when the concentration of astaxanthin was increased to 5 mg ml.

Conclusion. The natural astaxanthin from X. dendrorhous, at an appropriate concentration, is effective in terminating the viability of, or retarding the proliferative activity of, Caco-2 cells, without harmful effects on NOKs.

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2018-03-05
2019-10-23
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