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Alpha-terpineol affects synthesis and antitumor activity of triterpenoids from Antrodia cinnamomea mycelia in solid-state culture.
Food & Function 2018 November 27
To enhance production of Antrodia cinnamomea triterpenoids (ACTs) from mycelia in solid-state culture, α-terpineol was added to the medium as an elicitor at an optimal concentration of 0.05 mL L-1. Multi-stage solvent extraction and HPLC analysis were performed, and the compositions of ACTs-E (from culture with elicitor) and ACTs-NE (from culture without elicitor) were found to be quite different. In assays of in vitro antitumor activity, ACTs-E, in comparison with ACTs-NE, produced stronger viability reduction in several tumor cell lines and stronger apoptosis induction in HeLa in a dose-dependent manner. Several related proteins involved in the mitochondrial pathway of apoptosis (p53, Bax, caspase-3) did not show expression upregulation by ACTs-E, suggesting that apoptosis induction occurred through a p53-independent process. Further analysis revealed that ACTs-E strongly inhibited synthesis of topoisomerase I (TOP1) and tyrosyl-DNA phosphodiesterase I (TDP1), which are involved in DNA repair, at both transcriptional and protein levels. Our findings suggest that ACTs-E have potential for applications in the pharmaceutical, clinical, and functional food industries, as a novel antitumor agent and a dual TOP1/TDP1 inhibitor.
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