Abstract
Effects of flavonoids extracted from Citrus reticulata (mandarin) juice on proliferation and migration of 3 human anaplastic thyroid carcinoma (ATC) cell lines were evaluated. Flavonoid components of Mandarin juice extract (MJe) were analyzed by uHPLC. Proliferation of CAL-62, C-643, and 8505C cells, measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide, was significantly reduced by MJe in a concentration- and time-dependent way, with maximal effect elicited at 0.5 mg/ml concentration after 48 h. Cytofluorimetric analysis showed a block in the G2/M phase of the cell cycle, accompanied by low cell mortality owed to autophagic death. The extract caused also a reduction of cell migration, associated with decreased activity of the metalloproteinase MMP-2. These findings demonstrate that the flavonoid fraction of mandarin juice exerts in vitro antiproliferative effects on ATC cells, associated with a reduction of migration, suggesting for such a functional food a potential use as adjuvant in the treatment of thyroid cancer.
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