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    New platinum (II) and palladium (II) complexes of coumarin-thiazole Schiff base with a fluorescent chemosensor properties: Synthesis, spectroscopic characterization, X-ray structure determination, in vitro anticancer activity on various human carcinoma cell lines and computational studies
    (Elsevier Science Sa, 2018) Sahin, Omer; Ozdemir, Ummuhan Ozmen; Seferoglu, Nurgul; Genc, Zuhal Karagoz; Kaya, Kerem; Aydiner, Burcu; Tekin, Suat
    A new coumarin-thiazole based Schiff base (Ligand, L) and its Pd(II), Pt(II) complexes; ([Pd(L)(2)] and [Pt(L)(2)), were synthesized and characterized using spectrophotometric techniques (NMR, IR, UV-vis, LC-MS), magnetic moment, and conductivity measurements. A single crystal X-ray analysis for only L was done. The crystals of L have monoclinic crystal system and P21/c space group. To gain insight into the structure of L and its complexes, we used density functional theory (DFT) method to optimize the molecules. The photophysical properties changes were observed after deprotonation of L with CN- via intermolecular charge transfer (ICT). Additionally, as the sensor is a colorimetric and fluorimetric cyanide probe containing active sites such as coumarin-thiazole and imine (CH = N), it showed fast color change from yellow to deep red in the visible region, and yellow fluorescence after CN- addition to the imine bond, in DMSO. The reaction mechanisms of L with CN-, F- and AcO- ions were evaluated using H-1 NMR shifts. The results showed that, the reaction of L with CN- ion was due to the deprotonation and addition mechanisms at the same time. The anti-cancer activity of L and its Pd(II) and Pt(II) complexes were evaluated in vitro using MTT assay on the human cancer lines MCF-7 (human breast adenocarcinoma), LS174T (human colon carcinoma), and LNCAP (human prostate adenocarcinoma). The anticancer effects of L and its complexes, on human cells, were determined by comparing the half maximal inhibitory concentration (IC50) values. The activity results showed that, the Pd(II) complex of L has higher antitumor effect than L and its Pt(II) complex against the tested human breast adenocarcinoma (MCF-7), human prostate adenocarcinoma (LNCAP), and human colon carcinoma (LS174T) cell lines.
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    The relation between monocyte/HDL-cholesterol ratio and dipper/non-dipper blood pressure status in patients with newly diagnosed hypertension
    (2020) Sahin, Omer; Ozkan, Eyup
    Aim: In this study, It was ivestigated to see if there was a correlation between dipper and non-dipper hypertension conditions and the MHR in patients newly diagnosed with hypertension. Material and Methods: One hundred and thirty-nine newly diagnosed hypertension patients who admitted department of cardiology. Patients were divided into two groups; dipper group and non-dipper group and Monocyte/HDL-cholesterol Ratio, high sensitive-C reactive protein and dipper/non-dipper status were examined. Results: There were 61 patients (mean age 47±13 and 48% male) in the dipper group and 78 patients (mean age 52±12and 49% male) in the non-dipper group. Mean MHR was 0.01550±0.00447 in dipper group and 0.01810±0.00661 in non-dipper group. Mean MHR was significantly higher in non-dipper group (0.009). There was a significant and positive correlation between MHR and Hs-CRP (r=0.350; p<0.001). Conclusion: When compared to the patients newly diagnosed with dipper hypertension, it has a high MHR level in the group of patients with non-dipper hypertension