Person: TINAZ, GÜLGÜN
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TINAZ
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GÜLGÜN
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Publication Metadata only Fabrication and characterization of electrospun GelMA/PCL/CS nanofiber composites for wound dressing applications(2022-12-01) TINAZ, GÜLGÜN; GÜNDÜZ, OĞUZHAN; Pilavci E., Ayran M., Ulubay D., Kaya E., TINAZ G., Ozakpinar O. B., Sancakli A., GÜNDÜZ O.In the present study, the effect of different ratios of GelMA concentration has been exhibited for wound dressing implementation by the electrospinning method using a new polymer combination of Gelatin methacrylate (GelMA)/Polycaprolactone (PCL)/Chitosan (CS). The nanofiber composites were fabricated due to their biocompatible, biodegradable, improved mechanical strength, low degradation rate, and hydrophilic nature to develop cell-mimicking, cell adhesion, proliferation, and differentiation. Different concentrations of GelMA were added to the PCL/CS solution as 5, 10, and 20 wt%, respectively, in the formic acid/acetic acid (7:3) solution. A photoinitiator was added to the solution for photo-crosslinking of GelMA. The influence of different solution concentrations (5, 10, and 20 wt%) on the structure\"s nanofiber production and fiber morphology was examined. SEM micrographs revealed that varied GelMA concentrations resulted in suitable and stable nanofiber composites. The average diameter of nanofiber composites grows as the GelMA concentration rises. FTIR, DSC, tensile test, degradation, and swelling test were evaluated. The results demonstrated that high mechanical strength, hydrophilic properties, and a slow degradation rate were observed with the presence and increment of GelMA concentration within the nanofiber composites. The antibacterial potential of GelMA/PCL/CS nanofiber composites was evaluated against P. aeruginosa and S. aureus using a disc diffusion assay. In vitro cell culture research was conducted by seeding NIH 3T3 fibroblast cells on nanofiber composites, proving these cells\" high cell proliferation rate, viability, and adhesion. 10 wt% GelMA-based nanofiber composites were found to have great potential for wound dressing applications.Publication Metadata only Quorum Sensing Inhibitor Activities of Celecoxib Derivatives in Pseudomonas aeruginosa(BENTHAM SCIENCE PUBL LTD, 2017) TINAZ, GÜLGÜN; Ulusoy, Seyhan; Senkardes, Sevil; Coskun, Inci; Bosgelmez-Tinaz, Gulgun; Soulere, Laurent; Queneau, Yves; Kucukguzel, S. GunizBackground: A series of novel N-(substituted aryl/alkylcarbamothioyl)-4-[5-(4-methylphenyl)3-( trifluoromethyl)-1H-pyrazol-1-yl] benzene sulfonamides [SGK 318, 319, 320, 324, 327] and N-(3-substitutedaryl/ alkyl-4-oxo-1,3-thiazolidin-2-ylidene)-4-[5-(4-methylphenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl] benzenesulfonamides[SGK 328, 329, 330, 334, 337] were synthesized and tested for their quorum sensing inhibitor (QSI) capacity using quorum sensing inhibitor selector 1 (QSIS1) bioassay. Findings: QSIS assay revealed that SGK 324, SGK 327 and SGK 330 have the potentials to interfere with QS system in QS inhibitor selector1 (QSIS1) reporter strain. Moreover, these compounds were found to significantly affect QS regulated elastase and biofilm productions in Pseudomonas aeruginosa PA01 strain without affecting its growth. Molecular modeling experiments suggested that SGK 330 fits within the binding site of LasR protein of P. aeruginosa. SGK 324 and 327 also bind LasR provided that they adopt a s-trans/s-cis conformation with respect to the thiourea function. Results and Conclusion: Results of this study indicated that these compounds could be developed as new QS inhibitors without killing the bacteria but as antivirulence compounds to restrict virulence of clinically important human pathogens.Publication Metadata only Investigation of Antimicrobial and Biofilm Properties of 3D Alginate/PolyethyleneGlycol/Phenethyl Alcohol Scaffolds.(2022-11-26) ULAĞ, SONGÜL; GÜNDÜZ, OĞUZHAN; TINAZ, GÜLGÜN; Aslan S. N., Altan E., ULAĞ S., GÜNDÜZ O., TINAZ G.Publication Metadata only Study on potential of additive manufactured wound dressing from hemp seed oil/polycaprolactone(2022-11-06) UZUN, MUHAMMET; ALTAN, ERAY; TINAZ, GÜLGÜN; GÜNDÜZ, OĞUZHAN; Ertaş İ. F., UZUN M., ALTAN E., Kabir M. H., TINAZ G., GÜNDÜZ O.Publication Metadata only Multilayer patches for the treatment of corneal perforations caused by infections(2022-09-28) CESUR, SÜMEYYE; TINAZ, GÜLGÜN; ŞENGÖR, MUSTAFA; OKTAR, FAİK NÜZHET; GÜNDÜZ, OĞUZHAN; Kijeńska-Gawrońska ., İlhan E., Cesur S., Sulutaş R. B., Pilavcı E., Dalbayrak B., Kaya E., Arısan E. D., Tınaz G., Şengör M., et al.Publication Metadata only Zeolite 4A as a jammer of bacterial communication in chromobacterium violaceum and pseudomonas aeruginosa(2022-07-01) TINAZ, GÜLGÜN; ULUSOY S., B Akalin R., cevikbas H., Berisha A., ORAL A., TINAZ G.Aim: To investigate the hypothesis that zeolites interfere with quorum-sensing (QS) systems of Chromobacterium violaceum and Pseudomonas aeruginosa by adsorbing N-acyl homoserine lactone (AHL) signal molecules. Methods: QS inhibition by zeolite 4A was investigated using an AHL-based bioreporter assay. The adsorption of the AHLs was evaluated by performing inductively coupled plasma-optical emission spectroscopy and confirmed by Monte Carlo and molecular dynamic simulations. Results: Zeolite 4A reduced the violacein production in C. violaceum by over 90% and the biofilm formation, elastase and pyocyanin production in P. aeruginosa by 87, 68 and 98%, respectively. Conclusion: Zeolite 4A disrupts the QS systems of C. violaceum and P. aeruginosa by means of adsorbing 3-oxo-C6-AHL and 3-oxo-C12-AHL signaling molecules and can be developed as a novel QS jammer to combat P. aeruginosa-related infections.Publication Metadata only Synthesis and Biological Activities of Some 1,3-Benzoxazol-2(3H)-One Derivatives as Anti-Quorum Sensing Agents(GEORG THIEME VERLAG KG, 2012) TINAZ, GÜLGÜN; Miandji, A. M.; Ulusoy, S.; Dundar, Y.; Ozgen, S.; Onurdag, F. K.; Bosgelmez-Tinaz, G.; Noyanalpan, N.Antibiotics are commonly used to treat microbial infections. Due to misuse or large-scale use of antibiotics, many pathogens have gained resistance which makes antibiotic treatments ineffective. The discovery that many bacteria use quorum sensing (QS) to regulate their virulence factor and pathogenicity production makes the QS system an attractive target for antimicrobial therapy. A series of 1,3-benzoxazol-2(3H)-one derivatives were designed and synthesized as QS inhibitors (QSIs) and tested for their QS inhibitory activities. In vitro quorum sensing inhibitor screen (QSIS) assay indicated that the 1,3-benzoxazol-2(3H)-one (compound 1), 5-chloro-1,3-benzoxazol-2(3H)-one (compound 6), 6-methyl-1,3-benzoxazol-2(3H)-one (compound 11), and 5-methyl-1,3-benzoxazol-2(3H)-one (compound 16), inhibit QS system in quorum sensing selector (QSIS)1 strain. These 4 QSIs also significantly reduced elastase production, biofilm formation and swarming motility of Pseudomonas aeruginosa PA01 strain. These results suggest that compound 1, 6, 11 and 16 may provide a starting point for the design and development of new anti-pathogenic drugs that restrict virulence of P. aeruginosa and possibly other clinically important human pathogens. In addition, these QSI molecules could potentially be used in combination with conventional antibiotics to increase the efficiency of disease control and to extend the life span of established antimicrobials.Publication Metadata only Fabrication of 3D Scaffolds with Antibacterial and Antibiofilm Properties for the Treatment of Chronic Wounds.(2022-11-25) TINAZ, GÜLGÜN; Tınaz G.Publication Metadata only Quorum-sensing inhibitor potential of trans-anethole aganist Pseudomonas aeruginosa(WILEY, 2018) TINAZ, GÜLGÜN; Aydemir, D. Hancer; Cifci, G.; Aviyente, V.; Bosgelmez-Tinaz, G.AimsQuorum sensing (QS) is a cell-cell communication system used by a broad spectrum of pathogenic bacteria to control the expression of their virulence genes. The interruption of QS systems of pathogenic bacteria has been considered as a novel way to fight bacterial diseases. In this study, trans-anethole, the main component of anise (Pimpinella anisum) oil was examined for its QS inhibitor (QSI) potential in an attempt to identify novel QSI compound effective against opportunistic pathogen Pseudomonas aeruginosa. Methods and ResultsThe preliminary screening of QSI capacity of trans-anethole was determined using a quorum-sensing inhibitor screen (QSIS) assay. The QSIS assay indicated that trans-anethole has QSI properties. QSI capacity of trans-anethole was further confirmed by lasB-gfp fussion assay and virulence factor assays. A sub-MIC of trans-anethole reduced the expression of lasB by 57%, elastase production by 59%, protease production by 56%, pyocyanin production by 95% and swarming motility by 68% without inhibiting growth of Pseudomonas aeruginosa PA01. Molecular docking and protein-ligand interaction studies were performed to understand the molecular mechanism underlying inhibitory activity of trans-anethole. The results of these analysis suggested that trans-anethole fits within the binding site of the LasR protein of P. aeruginosa. ConclusionTrans-anethole has the potential to inhibit QS-regulated virulence factors in P. aeruginosa by binding to LasR protein, similar to its natural ligand N-(3-oxododecanoyl)-l-homoserine lactone. Significance and Impact of the StudyIn this study, for the first time, it was demonstrated that trans-anethole has the potential to disrupt bacterial communication and can be developed as a novel QSI to combat with P. aeruginosa and other clinically significant pathogens.Publication Metadata only Catalytic Au/PEDOT/Pt micromotors for cancer biomarker detection and potential breast cancer treatment(SPRINGER HEIDELBERG) TINAZ, GÜLGÜN; Yurdabak Karaca, Gozde; Kuralay, Filiz; Bingol Ozakpinar, Ozlem; Uygun, Emre; Koc, Umran; Ulusoy, Seyhan; Bosgelmez Tinaz, Gulgun; Oksuz, Lutfi; Uygun Oksuz, AysegulThe synthesis and biomedical applications of nano/micromotors have attracted great attention. In this work, preparation and characterization of catalytic gold/poly(3,4-ethylenedioxythiophene)/platinum (Au/PEDOT/Pt) micromotors were reported to present their contribution for cancer biomarker miRNA-21 detection. Potential use of these motors for possible cancer treatment was also illustrated after their biocompability had shown. At first, anti-miRNA probe immobilized Au/PEDOT/Pt micromotors (probe DNA/Au/PEDOT/Pt/MMs) were used for the sensitive and selective recognition of synthetic miRNA-21 target sequence to present the proof-of-concept. Then intracellular studies were carried out using four types of cancer cells (human breast cancer cell line, MCF-7, human colorectal adenocarcinoma cell line, HT-29, human lung carcinoma cell line, A-549 and human osteosarcoma cell line, SJSA-1). These studies illustrated the high selectivity of probe DNA/Au/PEDOT/Pt micromotors for MCF-7 and SJSA-1 cells. Later, antiproliferative and cytotoxic effects of the micromotors and their potential use for breast cancer treatment were investigated.