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Expression of P53, BAX, and BCL-2 in human malignant melanoma and squamous cell carcinoma cells after tea tree oil treatment in vitro

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Abstract

Tea tree oil (TTO) is an essential oil obtained by steam distillation from the leaves of Melaleuca alternifolia (Myrtaceae). This oil has traditionally been used for the treatment of various skin infections. The present study aimed to investigate the cytotoxic effects of TTO against two representative types of human skin cancer, namely malignant melanoma (A-375) and squamous cell carcinoma (HEp-2).To outline the basic molecular mechanism involved in apoptosis induction in A-375 and HEp-2 cell lines, Annexin V/PI staining for apoptosis detection, cell cycle analysis were monitored using flow cytometry and mRNA expression levels of the apoptosis-regulatory genes P53, BAX, and BCL-2 were determined by real-time PCR and western blot after treatment with TTO. Results showed that TTO exhibited a strong cytotoxicity towards A-375 and HEp-2 cell lines, with IC50 values of 0.038% (v/v) and 0.024% (v/v) respectively. This cytotoxicity resulted from TTO induced apoptosis in both A-375 and HEp-2 cell lines as evidenced by morphological features of apoptosis and Annexin V/PI staining results in addition to the activation of caspase-3/7 and -9, upregulation of pro-apoptotic genes (P53 and BAX) and downregulation of the anti-apoptotic gene BCL-2. Additionally, cell cycle analysis showed that TTO caused cell cycle arrest mainly at G2/M phase. Taken together, the results of this study reveal that TTO is an effective apoptosis inducer in A-375 and HEp-2 cancer cell lines, indicating that it could be a promising chemopreventive candidate to be used in topical formulations against melanoma and squamous cell cancers; however, further in vivo studies may be warranted.

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Authors and Affiliations

  1. Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Giza, Egypt

    Mohammed A. Ramadan, Alaa E. Shawkey & Ashraf O. Abdellatif

  2. Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Giza, Egypt

    Mohamed A. Rabeh

  3. Department of Microbiology and Immunology, Faculty of Pharmacy, Karary University, Khartoum, Sudan

    Ashraf O. Abdellatif

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  1. Mohammed A. Ramadan
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  2. Alaa E. Shawkey
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  3. Mohamed A. Rabeh
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  4. Ashraf O. Abdellatif
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Correspondence to Alaa E. Shawkey.

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Ramadan, M.A., Shawkey, A.E., Rabeh, M.A. et al. Expression of P53, BAX, and BCL-2 in human malignant melanoma and squamous cell carcinoma cells after tea tree oil treatment in vitro. Cytotechnology 71, 461–473 (2019). https://doi.org/10.1007/s10616-018-0287-4

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  • DOI: https://doi.org/10.1007/s10616-018-0287-4

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