Browsing by Author "Onder, Gozde Ozge"

Now showing 1 - 3 of 3

Caffeine Increased Antitumor Effects of Paclitaxel (Ptx) in Mcf-7 and Mda-Mb Breast Cancer Cells
(Marmara Univ, 2023) Aydin, Funda; Onder, Gozde Ozge; Goktepe, Ozge; Bitgen, Nazmiye
Although progress has been made in the diagnosis and treatment of breast cancer, which is one of the most important causes of women's health, it is still one of the leading causes of death in women. One of the most prominent causes for this is illness resistance to the medications employed in treatment. For this reason, the trend towards combination therapy research has increased in addition to conventional therapy. In this study, we aimed to investigate the effect of co-administration of caffeine (CAF) and paclitaxel (PTX), which is frequently used in breast cancer, on MDA-MB-231 and MCF-7 cells. For this purpose, 4 groups were determined as control, CAF, PTX and CAF+ PTX. MTT assay was used to assess cell viability and the appropriate dose for CAF was determined. The apoptotic effect of the drug combination on cell lines was evaluated with the TUNEL method, and it was determined at what stage it paused cell division by cell cycle analysis. According to the study's findings, the results indicated that CAF induced apoptosis in breast cancer cells and the best effect was in the group administered with PTX. Furthermore, it was discovered that CAF and PTX in the MCF-7 cell lines, both together and separately, blocked cell division in the S phase in MCF-7 cell lines. These results are promising for future studies that will prove the usefulness of CAF as an adjuvant in the treatment of breast cancer.
Raman Spectroscopy: a Novel Experimental Approach To Evaluating Cisplatin Induced Tissue Damage
(Elsevier, 2020) Yay, Arzu; Onses, Mustafa Serdar; Sahmetlioglu, Ertugrul; Ceyhan, Ayse; Pekdemir, Sami; Onder, Gozde Ozge; Aydin, Funda
The aim of this work is to clarify the effect of curcumin and beta-carotene on cisplatin-induced tissue damage and to demonstrate the potential of Raman spectroscopy to detect tissue changes consistent with liver and kidney histopathology as a potential diagnostic adjunct. In the study, 56 Wistar albino female rats were used and randomly divided into 7 groups (n:8). Sham group received only sesame oil; Cisplatin group, received a single dose injection of cisplatin; Beta-carotene group, treated with beta-carotene orally; Cisplatin + Beta-carotene group, pretreated with beta-carotene 30 min prior to the cisplatin injection, then received cisplatin; Curcumin group, orally treated with curcumin; Cisplatin + Curcumin group, pretreated with curcumin 30min prior to the cisplatin injection, then received cisplatin. The second application was performed 1 week after the first application. One of the liver and kidney tissues was taken to 10% form for histopathological examinations and the others were taken to -80 degrees C for raman spectroscopy. Received sections were hematoxylin-eosin stained. The avidin-biotin peroxidase method was used for to investigate anti-TNF-alpha and IL1-beta activities. TUNEL method was applied to determine apoptotic cells. According to our histopathological findings, beta-carotene and especially curcumin have been found to possess hepatorenal protective activities. These datas were supported by the microscopic damage scores. Although some of these findings were observed in both the cisplatin + curcumin and cisplatin + beta-carotene groups, the incidence and severity of histopathological lesions were less than the cisplatin group. Both immunohistochemical studies and Raman spectroscopy results consistent with histopathological examination of hematoxylen-eosin stained sections. Raman spectroscopy represents a suitable tool to provide insights into structural factors involved in the mechanisms underlying antitumor effects of platinum drug.
Therapeutic Potential of Hesperidin: Apoptosis Induction in Breast Cancer Cell Lines
(Pergamon-elsevier Science Ltd, 2023) Onder, Gozde Ozge; Goktepe, Ozge; Baran, Munevver; Bitgen, Nazmiye; Aydin, Funda; Yaya, Arzu
Hesperidin is a flavonoid commonly found in citrus fruits. Studies have shown that hesperidin has anti-inflammatory, analgesic, and antimicrobial properties, as well as its effectiveness in carcinogenesis. In this paper, we aim to investigate the molecular mechanisms of hesperidin-induced apoptosis in MCF-7 and MDA-MB-231 cancer cells.The inhibitory effect of hesperidin on cellular proliferation was evaluated with the MTT assay. Cell cycle analysis of hesperidin-treated cells was then performed, as well as immunocytochemical analysis of the effect on the apoptosis pathway (TUNEL, Bax, and Bcl-2 expression).Moreover, hesperidin induced cellular apoptosis in MCF-7 breast cancer cells by inhibiting Bcl-2 and enhancing Bax expression at protein levels. On the other hand, hesperidin caused apoptosis in the MDA-MB-231 breast cancer cell line, but it did not activate the Bax/Bcl-2 pathway. Hesperidin also induced cell cycle arrest at the S phase in the MCF-7 and MDA-MB-231 cell lines.These findings showed that hesperidin is a potential therapeutic candidate for preventing the progression of breast cancer. In addition, hesperidin could significantly stimulate the death mechanisms in ER/PR (+) MCF-7 cells by changing the expression balance of Bax and Bcl-2 proteins, but lead ER/PR (-) MDA-MB-231 breast cancer cells to apoptosis in a different way.