Leaf extract of Osbeckia octandra induces apoptosis in oral squamous cell carcinoma cells

Kim, Jue Young and Kim, Jin and Bandara, B. M. Ratnayake and Tilakaratne, Wanninayake M. and Kim, Dokyeong (2022) Leaf extract of Osbeckia octandra induces apoptosis in oral squamous cell carcinoma cells. BMC Complementary Medicine And Therapies, 22 (1). ISSN 2662-7671, DOI https://doi.org/10.1186/s12906-022-03505-4.

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Background Osbeckia octandra is a plant endemic to Sri Lanka and is used in ethnomedicine for treating various diseases. However, the anti-cancer properties of O. octandra are yet to be fully investigated. In the present study, we evaluated the anti-cancer effects of O. octandra on oral cancer cells. Methods Human oral cancer cell lines (HSC2, YD10B, YD38, YD9, and YD32) were used in this study. BrdU incorporation, cell cycle and annexin-V/PI staining were all evaluated using flow cytometry to determine the extent to which O. octandra leaf extract inhibits cell proliferation and induces apoptosis. Cell viability and reactive oxygen species (ROS) were also measured in order to investigate the anti-cancer effects of O. octandra extracts. Western blotting was performed to detect cell cycle related protein such as cyclin d1 and cdk4, and to detect apoptosis-related proteins such as Bcl-2, Bcl-X-L, Bax, Caspase-9, Cleaved caspase-3, Fas, Caspase-8, and Bid. Results Leaf extract of O. octandra reduced oral squamous cell carcinoma (OSCC) cell viability in a dose-dependent manner. Leaf extract of O. octandra has non-toxic in normal keratinocytes. Also, O. octandra extract interrupted the DNA replication via G1 phase arrests, and this effect was independent of ROS generation. In the apoptosis-related experiments, the population of annexin V-positive cells increased upon treatment with O. octandra extract. Furthermore, the expression of anti-apoptotic protein (Bcl-2 and Bcl-xL) was decreased, whereas the expression of cleaved caspase-3 protein was increased in O. octandra-treated OSCC cells. Conclusions The results suggest that a leaf extract of O. octandra inhibited the proliferation of OSCC cells through G(1) phase arrest and interrupting DNA replication. The leaf extract of O. octandra could trigger the apoptotic response via caspase 3 activation in OSCC cells. These results suggest that O. octandra has the potential to be developed as an alternative medicine for treating OSCC.

Item Type: Article
Funders: S & T Support Program for Developing Countries - Ministry of Sciences, ICT, and Future plan [Grant No: 2013K1A3A9A01044071], Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [Grant No: 2021R1I1A1A01045571]
Uncontrolled Keywords: Osbeckia octandra; Cell cycle arrest; Apoptosis; Oral squamous cell carcinoma
Subjects: R Medicine > R Medicine (General)
R Medicine > RV Botanic, Thomsonian, and eclectic medicine
Divisions: Faculty of Dentistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 01 Aug 2022 06:58
Last Modified: 01 Aug 2022 06:58
URI: http://eprints.um.edu.my/id/eprint/33459

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