Investigation of the effect of Thymoquinone (TQ) alone or in combination with cisplatin on cell growth, cell cycle progression and apoptosis of human oral.

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Investigation of the effect of Thymoquinone (TQ) alone or in combination with cisplatin on cell growth, cell cycle progression and apoptosis of human oral epithelial squamous cell carcinoma in vitro Abdulwahab Noorwali, Omer Aloafi,Safia alattas, Fathia Zahran, Ahmad Alabd Prof. Abdulwahab Noorwali clinical Biochem. Faculty of Medicine KAU

Introduction -Nigella sativa, commonly known as black cumin, is an annual flowering plant native to Mediterranean countries, Pakistan and India. - Its seed oil had been used in Arab traditional herbal medicine for the treatment of arthritis, lung diseases and hypercholesterolemia -Studies had shown that the biological activity of Nigella sativa seeds is mainly attributed to its essential oil component which is pre-dominantly (30–48%) thymoquinone. -Since the extraction of thymoquinone by El-Dakhakhany, a number of studies have tested this compound for its therapeutic effect in many diseases including inflammation, cancer, sepsis, atherosclerosis and diabetes.

This compound was later found to inhibit the growth of many different kinds of carcinoma, including glioma/glioblastoma (U87 MG and T98G, M059K and M059J) [Cecarini V,2010, Gurung RL, 2010], breast adenocarcinoma (multi-drug-resistant MCF-7/TO,PO, MCF-7, MDA-MB-231 and BT-474) [52,53]. leukemia (HL-60 and Jurkat) [52,54,55], lung cancer (NCI-H460 and A549)[56,57] colorectal carcinoma (HT-29, HCT-116, DLD-1, Lovo and Caco-2) [57,58], pancreatic cancer (MIA PaCa-2, HPAC and BxPC-3)[40,57], osteosarcoma (MG63 and MNNG/HOS) [59], prostate cancer (LNCaP, C4-2B, DU145 and PC-3) [60–62].

Aim of The Study To investigate the effects Thymoquinone (TQ) alone or in combination with cisplatin (CDDP) on cell growth, apoptosis of oral squamous cell carcinoma (UMSCC-14C) cells in vitro. To the best of our knowledge, this is one of the few studies to investigate the effect of TQ in oral cancer in vitro.

Materials and Methods Two human cell lines were included: Oral Squamous Epithelial cell (OEC) & UMSCC-14C. Cells were maintained in monolayer culture. Cells were treated with Thymoquinone with/without cisplatin. Cell viability was assessed using WST-1 assay after incubating cells with the specified treatment at different concentrations & duration. Dose response curves were plotted using serial concentration and percent viability. The results are expressed as mean ± STD. IC50s were Calculated using Sigma Plot Software Version 16.0.

Materials and Methods Using Flow cytometry, we assessed apoptosis. Western blot analysis was used to assess the expression level of some key apoptotic proteins such as, p53, caspase-9 and Bcl-2. One and two way ANOVA was employed to detect significance between groups. p<0.05 was considered as statistically significant.

Materials and Methods Combination index (CI) was calculated as described by (Chou & Talalay, 1984). Briefly, exponentially growing cells was exposed to equitoxic concentrations of TQ and cisplatin in 96-well plates for 72 h and subsequently subjected to WST-1 assay. CI was calculated from the formula: The nature of drug interaction is defined as synergism if CI 1.2; and additive if CI ranges from

Results

Effect Of TQ,, CDDP And Their Combination against UM-SCC-14C Cell Line after 6 hours treatment

Effect Of TQ,, CDDP And Their Combination against UM-SCC-14C Cell Line after 24 hours treatment

Effect Of TQ,, CDDP And Their Combination against UM-SCC-14C Cell Line after 24 hours treatment

Effect Of TQ,, CDDP And Their Combination against OEC Cell Line after 24 hours treatment

Effect Of TQ, CDDP And Their Combination Apoptosis Assay In OEC Cell Line after 24 hours treatment

Effect Of TQ,, CDDP And Their Combination On expression level of P53 in UM-SCC-14C Cell Line

Effect Of TQ, CDDP And Their Combination On Bcl-2 Activity In UM-SCC-14C Cell Line

Effect Of TQ, CDDP And Their Combination On Caspase 9 Activity In UM-SCC-14C Cell Line

Conclusion and Recommendations Our results demonstrate that TQ significantly reduced the cell viability of UM-SCC cell line, in a time and concentration dependent manner. Also, The results demonstrate that Thymoquinone and/or Cisplatin have anti-proliferative property in UM-SCC cell lines. Combinations of the two drugs have synergistic effects and show potential in suppressing Oral Squamous cell carcinoma of oral cancer. The findings may offer an alternative strategy for development of potential antineoplastic therapies against squamous cell carcinoma. Further studies are required to understand the mechanism(s) of action by assessing cell cycle progression using Flow cytometry.

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