Türkiye Klinikleri - Restoratif Diş Tedavisi

Estetik diş hekimliği uygulamaları, dental restoratif uygulamaların önemli bir kısmını oluşturmaktadır. Estetik beklentilerin artmasıyla, diş beyazlatma, hastalar tarafından yüksek oranda talep edilen diş hekimliği uygulamalardan biri haline gelmiştir. Günümüzde diş beyazlatma sistemlerinde birçok seçenek mevcutturBeyazlatmada en önemli konu hasta ile beklentiler ve hedefler konusunda uzlaşmaya varılmasıdır. Hastanın, dişlerinde var olan restorasyonların beyazlamayacağını bilmesi ve hassasiyet gibi olası yan etkiler konusunda da bilgilenmesi önemlidir. Bu konular hakkında bilgi sahibi olması beyazlatmanın uzun süreli başarısı için önemlidir. Beyazlatma ajanlarıyla yapılan beyazlatma sistemlerinde, ilk uygulandıkları günden bugüne dek çeşitli ilerlemeler kaydedilmiştir. Bu ajanlar son derece oksidan maddelerdir. Uygun koşullarda uygulanmadıklarında, mine dokusunda ve periodontal dokularda geri dönüşü olmayan sorunların ortaya çıkabileceği bilinmelidir. Bu yüzden hekim mutlaka yeterli bilgi ve donanıma sahip olmalıdır. Uygun endikasyon ve yeterli donanım sayesinde, hastalara estetik bir gülüş sağlanabilir

Synthesis, antimicrobial evaluation and molecular modeling studies of novel thiosemicarbazides/semicarbazides derived from p-aminobenzoic acid

© 2022 Elsevier B.V.The development of novel antimicrobial agents is critical to combat life-threatening drug-resistant bacterial and fungal pathogens. In the present study, a new series of p-aminobenzoic acid (PABA) derivatives carrying thiosemicarbazide/semicarbazide moiety were designed, synthesized, and studied for their antimicrobial activity. The target molecules (3a–f, 4a–f) were achieved by the reaction of 4-aminobenzohydrazide, obtained from PABA, and various phenyl isothiocyanates/isocyanates. Following structural characterization by spectroscopic methods (1H NMR, 13C NMR, FT-IR, and LC-MS analyses), the synthesized compounds were tested for their antimicrobial activity against Staphylococcus aureus, Escherichia coli, Candida albicans, and their clinical isolates. Thiosemicarbazides with lipophilic substituents on the phenyl ring were identified as the most active compounds in this series. Among the studied molecules, compound 3e, thiosemicarbazide derivative with trifluoromethyl groups on the phenyl moiety, showed the best antimicrobial activity. Physicochemical parameters of the compounds were computed to predict the drug-likeness of the title compounds. Finally, molecular docking studies were performed in the allosteric binding pocket of ᴅ-alanine:ᴅ-alanine ligase (Ddl) to explain the potential antibacterial activity mechanism of 3e against S. aureus strains

Synthesis and molecular modeling of MetAP2 of thiosemicarbazides, 1,2,4-triazoles, thioethers derived from (S)-Naproxen as possible breast cancer agents

© 2022New thiosemicarbazides (3, 5-6), 1,2,4-triazoles (14-15) and thioethers (22-68) from derived (S)-Naproxen were synthesized in this study. The structure of these compounds were elucidated by spectral (FT-IR, 1H NMR, 13C NMR) methods, besides elemental analysis and TLC. The molecular binding of the compounds on MetAP-2 was performed. Anticancer effects of the synthesized compounds were studied by using MTT assay method on MCF-7 (includes oestrogene and progesterone receptors) and MDA-MB-231 (lacks estrogen and progesterone receptors) adenocarcinoma cell lines at 0, 10, 25, 50, 75 and 100 μM concentrations for 24 h. The IC50 values of novel (S)-Naproxen derivatives were determined between from 5 to 100 μM on MCF-7 breast cancer cell line and MDA-MB-231 cell lines. The apoptotic activity of selected compounds 22 and 42 were first analyzed by Annexin V staining using Tali Image-Based Cytometer. Mitochondrial membrane potential changes determined in fluorescence plate reader following JC-1 stain for compounds 22 and 42 in MCF-7 and MDA-MB-231 cells. The effect of these compounds on the cell viability 4T1 mouse mammary tumor cell line was tested at 1 to 5 times of calculated IC50 value (IC50x1, IC50x2, IC50x3, IC50x4, and IC50x5). Next in order to determine the toxicity of the combination of compound 51 and Docetaxel, WST-1 cell viability and proliferation assay was performed with 4T1

Synthesis, molecular modeling, in vivo study and anticancer activity against prostate cancer of (+) (S)-naproxen derivatives

© 2020 Elsevier Masson SASIn this study, (S)-naproxen thiosemicarbazides (3a-d), 1,2,4-triazoles (4a-c), triazole-thioether hybride compounds (5a-p) were synthesized and their structures (3a, 3d, 4a and 5a-p) were confirmed by FT-IR, 1H NMR,13C NMR, HR-Mass spectra and elemental analysis. These compounds are designed to inhibit methionine amino peptidase-2 (MetAP2) enzyme in prostate cancer. These compounds (3d, 5a-p) evaluated against androgen-independent prostate adenocarcinoma (PC-3, DU-145) and androgen-dependent prostate adenocarcinoma (LNCaP) cell lines by using MTS method. Compounds 5a, 5b, 5d and 5e showed 14.2, 5.8, 10.8 and 8.4 μM anticancer activity against PC-3 cell lines, compounds 5e, 5g and 5n presented anticancer activity against DU-145 cell lines 18.8, 12.25 and 10.2 μM, and compounds 5g, 5m and 5n exhibited anticancer activity against LNCaP cell lines 12.25, 22.76 and 2.21 μM, respectively. Consequently, of these results, compounds 5e and 5n showed the highest activities against androgen dependent and independent prostate cancer cell lines, so these compounds could be potent small molecules against prostate cancer. Furthermore, mitogen-activated protein kinase (MAPK) pathway activation, AKT (protein kinase B) phosphorylation and androgen receptor activation of compound 5n (SGK636) were investigated in LNCaP cells by using Western blot method. Compound 5n (SGK636) was also tested against mRNA expression analysis of the Bax, Bcl-2, Caspase 3, Caspase 9 by using real-time PCR analysis. Compound 5n was given to nude male mice with cancer in comparison to the control group. Compound 5n was found to reverse the malignant phenotype in the nude male mice, whereas the prostate cancer progressed in the control group. Analysis of some blood parameters in the study showed that they were within the normal values with respect to the control. The blood values of the animals treated according to the control group also exhibited compliance with the blood limit values. Molecular docking and dynamics simulation of compound 5n binding to Methionine Aminopeptidase 2 (MetAP2) enzyme rationalized its potential activity. In addition, inhibition assay MetAP2 enzyme of compound 5n was evaluated. Taken together, we suggest compound 5n to be a potential candidate for prostate cancer therapy

Synthesis, molecular modeling, in vivo study and anticancer activity against prostate cancer of (+) (S)-naproxen derivatives

© 2020 Elsevier Masson SASIn this study, (S)-naproxen thiosemicarbazides (3a-d), 1,2,4-triazoles (4a-c), triazole-thioether hybride compounds (5a-p) were synthesized and their structures (3a, 3d, 4a and 5a-p) were confirmed by FT-IR, 1H NMR,13C NMR, HR-Mass spectra and elemental analysis. These compounds are designed to inhibit methionine amino peptidase-2 (MetAP2) enzyme in prostate cancer. These compounds (3d, 5a-p) evaluated against androgen-independent prostate adenocarcinoma (PC-3, DU-145) and androgen-dependent prostate adenocarcinoma (LNCaP) cell lines by using MTS method. Compounds 5a, 5b, 5d and 5e showed 14.2, 5.8, 10.8 and 8.4 μM anticancer activity against PC-3 cell lines, compounds 5e, 5g and 5n presented anticancer activity against DU-145 cell lines 18.8, 12.25 and 10.2 μM, and compounds 5g, 5m and 5n exhibited anticancer activity against LNCaP cell lines 12.25, 22.76 and 2.21 μM, respectively. Consequently, of these results, compounds 5e and 5n showed the highest activities against androgen dependent and independent prostate cancer cell lines, so these compounds could be potent small molecules against prostate cancer. Furthermore, mitogen-activated protein kinase (MAPK) pathway activation, AKT (protein kinase B) phosphorylation and androgen receptor activation of compound 5n (SGK636) were investigated in LNCaP cells by using Western blot method. Compound 5n (SGK636) was also tested against mRNA expression analysis of the Bax, Bcl-2, Caspase 3, Caspase 9 by using real-time PCR analysis. Compound 5n was given to nude male mice with cancer in comparison to the control group. Compound 5n was found to reverse the malignant phenotype in the nude male mice, whereas the prostate cancer progressed in the control group. Analysis of some blood parameters in the study showed that they were within the normal values with respect to the control. The blood values of the animals treated according to the control group also exhibited compliance with the blood limit values. Molecular docking and dynamics simulation of compound 5n binding to Methionine Aminopeptidase 2 (MetAP2) enzyme rationalized its potential activity. In addition, inhibition assay MetAP2 enzyme of compound 5n was evaluated. Taken together, we suggest compound 5n to be a potential candidate for prostate cancer therapy