In Vitro Study of the Potential Role of Olive Oil Oleuropein in Modulating the 5-FU Cytotoxic Efficacy against the Tongue Squamous Cell Carcinoma

Mouna Abdullah; Mohamed I. Mourad; Mahmoud Fathy; Azza El-Sissi

doi:10.3889/oamjms.2022.10119

Authors

Mouna Abdullah Depatment of Oral and Maxillofacial Pathology, Faculty of Dentistry, Tripoli University, Tripoli, Libya https://orcid.org/0000-0002-1961-0090
Mohamed I. Mourad Department of Oral and Maxillofacial Pathology, Faculty of Dentistry, Mansoura University, Mansoura, Egypt; Department of Oral and Maxillofacial Pathology, Faculty of Dentistry, Sinai University Kantara Branch, Ismailia, Egypt
Mahmoud Fathy Department of Oral and Maxillofacial Pathology, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
Azza El-Sissi Department of Oral and Maxillofacial Pathology, Faculty of Dentistry, Mansoura University, Mansoura, Egypt

DOI:

https://doi.org/10.3889/oamjms.2022.10119

Keywords:

Oleuropein, 5-fluorouracil, Tongue squamous cell carcinoma, MTT, Flowcytometry, Synergistic effect, Migration

Abstract

BACKGROUND: 5-fluorouracil (5-FU) is an anticancer drug used to inhibit the proliferation of many different tumor cells. Since severe side effects are associated with this drug, its combination with different natural compounds would allow the use of a significantly lower dose of 5-FU. Oleuropein (OLEU), has been shown to have inhibitory effects on various types of cancers.
AIM: The main objective of the current study was to assess the cytotoxic effect of OLEU and the chemotherapeutic drug 5-FU on Human Tongue Carcinoma Cancer Cell Line (HNO-97) and Human Normal Oral Epithelial Cell Line (OEC) either independently or combinatory effect.
MATERIALS AND METHODS: 3-(4,5- dimethylthiazol-2-Yl)-2,5-diphenyltetrazolium bromide (MTT) assay for cell viability, and half-maximal inhibitory concentration (IC50) was calculated. Flowcytometry for cell cycle analysis was performed. Also, in vitro scratch assay was done to assess the inhibitory effects of OLEU on the migration of cells.
RESULTS: MTT assay study demonstrated that OLEU and 5-FU alone or in combinations have produced a significant inhibitory effect on both normal and cancer cell lines with a favorable impact for OLEU on cancer cell lines rather than the normal one. A significant increase in the cell inhibitory % was reported between the single and the combinations treated groups as compared to the non-treated control group. Cell cycle analysis via flowcytometry showed that OLEU had induced cell cycle arrest at G0/1 phase, decreased S phase and G2/M phase either independently or in combination for 24h and 48h when compared with a non-treated control group. A Scratch assay test showed that OLEU could induce delayed wound healing.
CONCLUSIONS: The findings of the present study suggest that OLEU can exert an anti-cancer effect on HNO-97 and may have the potential for potentiation of 5-FU cytotoxic effects and reduction of its adverse effects. In addition, OLEU could inhibit cancer progression and expansion from the initial tumor.

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