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Caniglia G, Valavanis D, Tezcan G, Magiera J, Barth H, Bansmann J, Kranz C, Unwin PR. Antimicrobial effects of silver nanoparticle-microspots on the mechanical properties of single bacteria. Analyst 2024; 149:2637-2646. [PMID: 38529543 DOI: 10.1039/d4an00174e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
Silver nanoparticles (AgNPs) conjugated with polymers are well-known for their powerful and effective antimicrobial properties. In particular, the incorporation of AgNPs in biocompatible catecholamine-based polymers, such as polydopamine (PDA), has recently shown promising antimicrobial activity, due to the synergistic effects of the AgNPs, silver(I) ions released and PDA. In this study, we generated AgNPs-PDA-patterned surfaces by localised electrochemical depositions, using a double potentiostatic method via scanning electrochemical cell microscopy (SECCM). This technique enabled the assessment of a wide parameter space in a high-throughput manner. The optimised electrodeposition process resulted in stable and homogeneously distributed AgNP-microspots, and their antimicrobial activity against Escherichia coli was assessed using atomic force microscopy (AFM)-based force spectroscopy, in terms of bacterial adhesion and cell elasticity. We observed that the bacterial outer membrane underwent significant structural changes, when in close proximity to the AgNPs, namely increased hydrophilicity and stiffness loss. The spatially varied antimicrobial effect found experimentally was rationalised by numerical simulations of silver(I) concentration profiles.
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Affiliation(s)
- Giada Caniglia
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee, 11 89081 Ulm, Germany.
| | | | - Gözde Tezcan
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK.
| | - Joshua Magiera
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK.
| | - Holger Barth
- Institute of Experimental and Clinical Pharmacology, Toxicology and Pharmacology of Natural Products, University of Ulm Medical Center, Albert-Einstein-Allee, 11 89081 Ulm, Germany
| | - Joachim Bansmann
- Institute of Surface Chemistry and Catalysis, Ulm University, Albert-Einstein-Allee 47, 89081 Ulm, Germany
| | - Christine Kranz
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee, 11 89081 Ulm, Germany.
| | - Patrick R Unwin
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK.
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Kocaeli AA, Tekin C, Ercelik M, Tezcan G, Aksoy SA, Kocaeli H, Bekar A, Taskapilioglu MO, Tolunay S, Tunca B. Concurrent presence of diabetes affects the GLUT3 programming of glucose metabolism in glioblastoma. Eur Rev Med Pharmacol Sci 2023; 27:8110-8118. [PMID: 37750639 DOI: 10.26355/eurrev_202309_33571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
OBJECTIVE Diabetes mellitus (DM)-mediated impaired glucose metabolism increase in the glioblastoma (GB) risk by inducing hyperglycemia and hyperinsulinemia. An integral membrane transport protein, glucose transporter 3 (GLUT3) facilitates glucose transport into GB tumor cells. We aimed to explore the regulation of GLUT3 in GB tumors of patients who were concurrently diagnosed with DM. PATIENTS AND METHODS Formalin-fixed paraffin-embedded (FFPE) tumor samples were collected from 93 GB patients and retrospectively analyzed. Of the total, 15 patients were concurrently diagnosed with DM (GB-DM). The role of GLUT3 in tumor aggressiveness was evaluated by analyzing its correlation with Ki67, P53 expression, MALAT1 expression, and peripheral blood hemoglobin A1C (HbA1c) level. T98G cells were treated with empagliflozin and metformin to modulate GLUT3. The RNA expression of GLUT3, SOX2, and MALAT1 was analyzed by real-time qPCR. The lactate levels of T98G cells were measured by Cobas c502 analyzer. A scratch wound assay was performed to investigate the migration rate of T98G cells. RESULTS GLUT3 expression was lower in GB-DM tumors than in GB-only tumors. In GB-DM, the expression of tumoral GLUT3 and peripheral blood glycated hemoglobin (HbA1c) levels were negatively correlated with P53 and Ki67. A decreased GLUT3 shortened the disease-free survival duration in GB-DM patients. Empagliflozin reduced GLUT3, while metformin-induced GLUT3 in T98G cells. The empagliflozin-mediated GLUT3 suppression induced SOX2 and MALAT1 expressions and influenced the migration capacity of T98G cells. CONCLUSIONS Our findings suggest that the low GLUT3 expression of the tumors of GB-DM patients may induce the production of adenosine triphosphate (ATP) from cellular energy sources other than glucose metabolism. However, further studies are warranted to confirm these results.
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Affiliation(s)
- A A Kocaeli
- Department of Endocrinology, Bursa State Hospital, Bursa, Turkey.
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Caniglia G, Tezcan G, Meloni GN, Unwin PR, Kranz C. Probing and Visualizing Interfacial Charge at Surfaces in Aqueous Solution. Annu Rev Anal Chem (Palo Alto Calif) 2022; 15:247-267. [PMID: 35259914 DOI: 10.1146/annurev-anchem-121521-122615] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Surface charge density and distribution play an important role in almost all interfacial processes, influencing, for example, adsorption, colloidal stability, functional material activity, electrochemical processes, corrosion, nanoparticle toxicity, and cellular processes such as signaling, absorption, and adhesion. Understanding the heterogeneity in, and distribution of, surface and interfacial charge is key to elucidating the mechanisms underlying reactivity, the stability of materials, and biophysical processes. Atomic force microscopy (AFM) and scanning ion conductance microscopy (SICM) are highly suitable for probing the material/electrolyte interface at the nanoscale through recent advances in probe design, significant instrumental (hardware and software) developments, and the evolution of multifunctional imaging protocols. Here, we assess the capability of AFM and SICM for surface charge mapping, covering the basic underpinning principles alongside experimental considerations. We illustrate and compare the use of AFM and SICM for visualizing surface and interfacial charge with examples from materials science, geochemistry, and the life sciences.
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Affiliation(s)
- Giada Caniglia
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Ulm, Germany;
| | - Gözde Tezcan
- Department of Chemistry, University of Warwick, Coventry, United Kingdom;
| | - Gabriel N Meloni
- Department of Chemistry, University of Warwick, Coventry, United Kingdom;
| | - Patrick R Unwin
- Department of Chemistry, University of Warwick, Coventry, United Kingdom;
| | - Christine Kranz
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Ulm, Germany;
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Tezcan G, Aksoy SA, Tunca B, Bekar A, Mutlu M, Cecener G, Egeli U, Kocaeli H, Demirci H, Taskapilioglu MO. Oleuropein modulates glioblastoma miRNA pattern different from Olea europaea leaf extract. Hum Exp Toxicol 2019; 38:1102-1110. [PMID: 31169033 DOI: 10.1177/0960327119855123] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Glioblastoma (GBM) is the most prevalent and deadliest subtype of glioma. Despite current innovations in existing therapeutic modalities, GBM remains incurable, and alternative therapies are required. Previously, we demonstrated that Olea europaea leaf extract (OLE) kills GBM cells by modulating miR-181b, miR-137, miR-153 and Let-7d expression. However, although oleuropein (OL) is the main compound in OLE, its role in the antitumour effect of OLE remains unknown. This study determined the effect of OL on GBM cell line T98G and compared the results with our previous findings regarding the effect of OLE on the same cell line. The antiproliferative activity of OL and its effect on temozolomide (TMZ) response were tested inT98G cells using WST-1 assay. OL inhibition was evaluated using one-way analysis of variance with Tukey's post hoc test. The effect of OL on miR-181b, miR-137, miR-153 and Let-7d expression was assessed using quantitative reverse transcription polymerase chain reaction. Fold differences in expression between untreated, OL or OL + TMZ-treated samples were calculated using 2-ΔCt method. Significance was evaluated using an independent sample t-test. Treatment with 277.5 and 555 µM OL resulted in 39.51% and 75.40% reductions in T98G cells within 24 h. Coadministration of 325 µM TMZ and 277.5 or 555 µM, OL caused 2.08- and 2.83-fold increases, respectively, in the therapeutic effect of TMZ. OL + TMZ significantly increased microRNA expression, particularly Let-7d, than OLE. In conclusion, OL has an antitumour effect on GBM cells mainly via regulation of Let-7d expression. The present results also indicate other minor compounds in OLE play important anticancer roles.
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Affiliation(s)
- G Tezcan
- 1 Institute of Fundamental Medicine and Biology, Open Lab: Gene and Cell Technologies, Kazan Federal University, Kazan, Russia
| | - S A Aksoy
- 2 Department of Medical Biology, Medical Faculty, Uludag University, Bursa, Turkey
| | - B Tunca
- 2 Department of Medical Biology, Medical Faculty, Uludag University, Bursa, Turkey
| | - A Bekar
- 3 Department of Neurosurgery, Medical Faculty, Uludag University, Bursa, Turkey
| | - M Mutlu
- 2 Department of Medical Biology, Medical Faculty, Uludag University, Bursa, Turkey
| | - G Cecener
- 2 Department of Medical Biology, Medical Faculty, Uludag University, Bursa, Turkey
| | - U Egeli
- 2 Department of Medical Biology, Medical Faculty, Uludag University, Bursa, Turkey
| | - H Kocaeli
- 3 Department of Neurosurgery, Medical Faculty, Uludag University, Bursa, Turkey
| | - H Demirci
- 2 Department of Medical Biology, Medical Faculty, Uludag University, Bursa, Turkey
| | - M O Taskapilioglu
- 3 Department of Neurosurgery, Medical Faculty, Uludag University, Bursa, Turkey
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Erturk E, Cecener G, Egeli U, Tunca B, Tezcan G, Gokgoz S, Tolunay S, Tasdelen I. 398: Evaluation of microRNA expression profiles in triple-negative (ER, PR and Her2/neu) breast cancer patients with and without germ-line BRCA mutations. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)50355-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ceylan S, Ak S, Tunca B, Ozturk E, Tezcan G, Cecener G, Egeli U, Yilmazlar T, Yerci O. 564: The expression level of MACC1 in early stage CRC patients of Turkish population. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)50499-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Erturk E, Cecener G, Tunca B, Egeli U, Tezcan G, Gokgoz S, Tasdelen I, Tolunay S, Alder H, Huebner K. 426 Distinct MiRNA Expression Patterns in Among Breast Tumors of Patients Carried and Non-carried Germ-line BRCA Mutations. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)71107-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ak S, Tunca B, Cecener G, Egeli U, Tezcan G, Zorluoglu A, Yilmazlar T, Ozturk E, Yerci O, Evrensel T. 271 Alterations of MiRNA Expression in Early-onset Turkish Colorectal Cancer Patients' Tumor Tissues. Eur J Cancer 2012. [DOI: 10.1016/s0959-8049(12)70966-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Mutlu D, Uygun V, Karagul A, Tezcan G, Yazisiz H, Hazar V, Colak D. PIX-14 Surveillance of cytomegalovirus (CMV) and human herpesvirus-6 (HHV-6) infections in pediatric allogeneic stem cell transplant recipients. J Clin Virol 2009. [DOI: 10.1016/s1386-6532(09)70219-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Erden G, Barazi AO, Tezcan G, Yildirimkaya MM. Biological variation and reference change values of CA 19‐9, CEA, AFP in serum of healthy individuals. Scandinavian Journal of Clinical and Laboratory Investigation 2009; 68:212-8. [DOI: 10.1080/00365510701601699] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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