Yazar "Muluk, N. bayar" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    Öğe
    Diffusion-weighted imaging measurements of central smell regions in COVID-19 patients: insular gyrus, corpus amygdala, and thalamus
    (Verduci Publisher, 2023) Burulday, V.; Muluk, N. bayar; Akgul, M. H.; Sayar, M. S.
    OBJECTIVE: The aim of this study was to investigate central smell centers with cranial magnetic resonance imaging (MRI) diffusion-weighted imaging (DWI) in COVID-19.PATIENTS AND METHODS: This retrospec-tive study evaluated cranial MRI images of 54 adults. The experimental group (Group 1), con-sisting of 27 patients with positive COVID-19 real-time Polymerase Chain Reaction (RT-PCR) assays, was compared to the control group (Group 2), comprising 27 healthy con-trols without COVID-19. The apparent diffu-sion coefficient (ADC) values were measured in the corpus amygdala, thalamus, and insular gyrus in both groups. RESULTS: Thalamus ADC values of the COVID-19 group were significantly lower com-pared to the control group bilaterally. Howev-er, no differences were found in the insular gy-rus and corpus amygdala ADC values between the two groups. Positive correlations were ob-served between the insular gyrus and cor-pus amygdala ADC values and the thalamus ADC values. Insular gyrus ADC values (right) were higher in females. Left insular gyrus and corpus amygdala ADC values were higher in COVID-19 patients with smell loss. Right in-sular gyrus and left corpus amygdala ADC values were lower in COVID-19 patients with lymphopenia.CONCLUSIONS: Diffusion restriction in ol-factory areas can be considered an obvious indicator that the COVID-19 virus affects and damages the immune system at the neuro-nal level. Given the urgency and lethality of the current pandemic, acute onset odor loss should be considered a high suspicion-adhe-sive index for patients with SARS-CoV-2 infec-tion. Therefore, the sense of smell should be considered and evaluated simultaneously with other neurological symptoms. DWI should be widely used as an early imaging method for central nervous system (CNS) infections, espe-cially in relation to COVID-19.
  • [ X ]
    Öğe
    Investigation of proapoptotic and cytotoxic effects of 2-aminobenzothiazole on human laryngeal carcinoma cells
    (Verduci Publisher, 2024) Haznedar, B.; Muluk, N. bayar; Sezer, Vejselova; Kutlu, H. M.; Cingi, C.
    OBJECTIVE: In the present study, we investigated the effects of 2-aminobenzothiazole application on human laryngeal carcinoma cells. MATERIALS AND METHODS: Human larynx epidermoid carcinoma (HEp-2) (ATCC (R) CCL-23 (TM)) cells were purchased from American Type Culture Collection (ATCC, USA). Human larynx epidermoid carcinoma HEp-2 cells were cultured in complete Dulbecco's Modified Eagle's Medium (DMEM) supplemented with fetal bovine serum (FBS) (10%) and penicillin/streptomycin (1%) in a CO2 (5%) incubator under standard cell culture conditions. 2-aminobenzothiazole was prepared, and further dilutions ranging from 3.13 to 100 mu M were prepared in fresh culture DMEM. HEp-2 cells on 96 well plates were incubated with the prepared dilutions of 2-aminobenzothiazole for 24, 48, and 72 hours. MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) test performed cytotoxicity evaluation and viability percentages. The annexin-V staining technique detected 2-aminobenzothiazole-triggered apoptosis of HEp-2 cells. The activated caspases 3/7 on HEp-2 cells after 2-aminobenzothiazole exposure were evaluated with flow cytometric analysis. The membrane potential changing of HEp-2 cells was measured following the Muse (TM) MitoPotential kit manufacturer instructions. RESULTS: MTT cytotoxicity test results showed that the viability of human laryngeal carcinoma cells decreased with an increase in the application of 2-aminobenzothiazole for 24 hours. The highest growth inhibition by 2-aminobenzothiazole for short-term application of 24 hours was detected at the highest concentration of 2-aminobenzothiazole (100 mu M). The results underline that the cytotoxic effect of 2-aminobenzothiazole is dose-dependent. Cytotoxicity test results for an application time of 48 hours showed that the cytotoxicity of 2-aminobenzothiazole is dose-dependent on HEp-2 cells. The required dose of 2-aminobenzothiazole to decrease the cell viability to 50 percent has been 9-fold augmented. Annexin-V findings showed that after exposure to IC50 concentration of 2-aminobenzothiazole for 24 hours, HEp-2 cells underwent the early apoptotic stage (25.99%) and late apoptotic (16.69%), whereas 56.93% of the treated cells were alive. Only 0.39% of 2-aminobenzothiazole treated cells were necrotic. All study results showed that 2-aminobenzothiazole triggered apoptosis on HEp-2 cells with a percentage of total apoptotic cells 42.62 compared to untreated HEp-2 cells. Caspase 3/7 activation results showed that only 0.65% of control HEp-2 cells were with activated caspase 3/7, and 99.35% live cells. The analysis data from the Muse cell analyzer revealed that the percentage of cells with intact mitochondrial membranes was 21.30 after 2-aminobenzothiazole application, and 79.9% were cells with depolarized mitochondrial membranes. It has been understood that the depolarization of the inner mitochondrial membrane has been considered a dysfunction in mitochondria as a sign of apoptosis and drug toxicity. CONCLUSIONS: Based on all study findings, 2-aminobenzothiazole has cytotoxicity on human laryngeal carcinoma cells in a dose and time-dependent manner. That means that it decreased viability via inducing caspase-dependent apoptosis. Consequently, it was concluded that 2-aminobenzothiazole has good potential to lead to cytotoxicity and apoptosis on human laryngeal carcinoma cells and, after deeper in vitro and in vivo investigations, can be a good candidate for designing anticancer drugs with high efficiency.