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Abstract
Cervical cancer is one of the most common female malignancies worldwide. Liquiritin (LT), a major constituent of Glycyrrhiza Radix, possesses a variety of pharmacological activities, including anti-cancer, anti-oxidative, anti-inflammatory and neuro-protective effects. However, its role in human cervical cancer remains to be elusive. In our study, we found that LT suppressed cervical cancer cell migration, invasion and cloning ability with little cytotoxicity to human normal cells. In addition, apoptosis was induced by LT in cervical cancer cells through activation of Caspase-3 and poly ADP-ribose polymerase (PARP) cleavage. LT-triggered apoptosis was dependent on extrinsic and intrinsic pathways, which were relied on Fas-associated protein with death domain (FADD)- and Bcl-2/Bax-regulated pathways, leading to Caspase-8 and Caspase-9 cleavage, respectively. LT was found to increase FADD expression, while reduce Bcl-2 expression, contributing to Caspase-3 cleavage. And tumor suppressors, p21 and p53, were enhanced after LT treatment, inhibiting the growth of cervical cancer cells in vitro. Significantly, in vivo study suggested that tumor growth was impeded by LT in a dose-dependent manner through enhancing apoptosis. Together, the data here revealed that LT was an effective and promising candidate for preventing human cervical cancer progression via apoptosis enhancement.
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