In the present study, we isolated and characterized a homogenous polysaccharide (GIAP1) from the alkaline extract of the roots of Glycyrrhiza inflata. The anti-tumor activity of GIAP1 toward human oral cancer SCC-25 cells and the underlying mechanisms were also examined in vitro. GIAP1 dose-dependently inhibited the proliferation of SCC-25 cells via inducing apoptosis. Moreover, GIAP1 downregulated Bax/Bcl-2 ratio, disrupted the mitochondrial membrane potential (MMP), and caused the release of cytochrome c to cytosol. Besides, GIAP1 triggered activation of capase-3 and caspase-9, as well as the degradation of poly (ADP-ribose) polymerase (PARP). In addition, the caspase-3 or caspase-9 inhibitor significantly inhibited GIAP1-induced apoptosis in SCC-25 cells. Collectively, we can conclude that the GIAP1 induces apoptosis in SCC-25 cells via a mitochondrial pathway.
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Conflicts of interest
Guang Zeng and Huan Shen contributed equally to this work.
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Zeng, G., Shen, H., Tang, G. et al. A polysaccharide from the alkaline extract of Glycyrrhiza inflata induces apoptosis of human oral cancer SCC-25 cells via mitochondrial pathway. Tumor Biol. 36, 6781–6788 (2015). https://doi.org/10.1007/s13277-015-3359-5
- Glycyrrhiza inflata
- Human oral cancer