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    Cytotoxic Effect of L-Methioninase from Brevibacterium linens BL2 in Combination with Etoposide against Glioblastoma Cells
    (Mdpi, 2023) Ipek, Semih Latif; Ozdemir, Meryem Damla; Gokturk, Dilek
    L-methioninase degrades methionine, which is essential in methionine-dependent cancer cells, resulting in specific cell death. Normal cells can synthesize their own methionine amino acids even in the absence of exogenous methionine. This selective targeting of cancer cells makes L-methioninase a promising therapeutic candidate for cancer. In this study, L-methioninase was partially purified from Brevibacterium linens BL2. The specific activity of the enzyme was found as 3.055 units/mg. IC50 values (24 h) of the enzyme were 5.792 units/mL for U87MG cell line and 5.215 units/mL for T98G cell line. When L-methioninase and etoposide were used in combination, synergistic cytotoxic and cell migration inhibition effects on U87MG and T98G cells alongside decreased cytotoxic activity on the Mouse Embryonic Fibroblast and HaCaT cells compared to etoposide alone were observed. Additionally, colony numbers of U87MG cells were significantly reduced by L-methioninase and etoposide administration after 21 days of incubation. Furthermore, L-methioninase suppressed the expression levels of survivin and c-Myc while increasing the expression level of Caspase-3 in both glioblastoma cell lines. These effects were enhanced when etoposide was used in combination with etoposide. This investigation reveals that the L-methioninase enzyme not only exhibited cytotoxic effects on U87MG and T98G cells but also enhanced the anti-proliferative effects of etoposide when used in combination while also demonstrating fewer adverse effects on normal cells.
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    The concurrent effect of acyclovir and rosemary on glioblastoma cell culture
    (C M B Assoc, 2019) Ozdemir, Meryem Damla; Gokturk, Dilek
    Human cytomegalovirus (HCMV) is a beta herpesvirus which large amount of people in world has interacted with. Recent studies indicated that CMV DNA is associated with several cancer types including Glioblastoma (GBM) which is the most common and aggressive type of primary brain cancer. In clinical studies it was shown that several antiviral medicines prolonged life span of glioblastoma patients. One of them is Acyclovir (ACV) which is a type of nucleoside analog, used to cure viral infections and might be a potential treatment supplement for Glioblastoma. In this study we aimed to investigate if ACV had cytotoxic effect on glioblastoma cell line U87 MG and also the effect of ACV on healthy cells. Furthermore it was aimed to search the effect of Rosmarinus Officinalis also known as rosemary which is an aromatic, perennial plant concurrent with ACV on glioblastoma and healthy cells.
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    The Effect of Rosmarinus Officinalis and Chemotherapeutic Etoposide on Glioblastoma (U87 MG) Cell Culture
    (Turkish Neurosurgical Soc, 2018) Ozdemir, Meryem Damla; Gokturk, Dilek
    AIM: To investigate whether high dose toxicities of etoposide can be overcome when used in combination with a natural compound named Rosmarinus Officinalis for glioblastoma (GBM). MATERIAL and METHODS: The impact of Rosmarinus Officinalis in combination with etoposide on GBM U87 MG cells and Mouse Embryonic Fibroblast (MEF) cells was investigated. Both neutral red and 3-(4, 5-Dimethylthiazol-2-Yl)-2, 5-Diphenyltetrazolium Bromide (MTT) assays were employed to gauge cell viability. RESULTS: We observed that increased quantities of Rosmarinus Officinalis induced MEF cell proliferation while it inhibited the survival of GBM cells. Our results indicate that Rosmarinus Officinalis did not affect the cytotoxicity of etoposide on GBM cell cultures. In contrast, in the MEF cell cultures, Rosmarinus Officinalis induced proliferation and diminished the impact of etoposide. CONCLUSION: Rosmarinus Officinalis offers hope for developing new cancer treatment strategies. However, further studies are needed to verify these results.