Abstract
Sakuranin is a flavanone which is a class of flavonoids found abundantly in Prunus species. Flavonoids have been long known for their anticancer properties against a range of human cancers. However, there are no previous reports on the anticancer effects of sakuranin flavanone molecule. This study was designed to study the anticancer effects of sakuranin against human oropharyngeal carcinoma cells along with investigating its effects on caspase-mediated apoptosis, mitochondrial membrane potential (MMP) loss, cell migration and invasion and m-TOR/PI3K/AKT signalling pathway. MTT assay was used to study effects on cell viability. The apoptotic studies were carried out through AO/EB staining, annexin V/FITC staining, comet assay and western blotting assay. Transwell chambers assay was used to study effects on cell migration and invasion. Flow cytometry was used to study effects of Sakuranin on mitochondrial membrane potential loss (MMP). Finally, western blotting was used to investigate m-TOR/PI3K/AKT signalling pathway. Results indicated that Sakuranin led to potent cell proliferation inhibition in a dose-dependent manner. Sakuranin also induced apoptotic cell death as indicated by fluorescence microscopy and annexin V/FITC staining assays. The apoptotic induction was mediated via activation of caspase-3, caspase-9, and Bax while as it led to downregulation of Bcl-2. Sakuranin also caused inhibition of cell migration and cell invasion along with causing significant decrease in MMP. Sakuranin also caused inhibition of expressions of proteins related with m-TOR/PI3K/AKT signalling pathway. In conclusion, the current findings clearly indicate anticancer effects of Sakuranin flavanone in human oropharyngeal cancer cells and are mediated via caspase activated apoptosis, inhibition of cell migration and invasion, loss of mitochondrial membrane potential and targeting m-TOR/PI3K/AKT signalling pathway.
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