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  • Küçük Resim
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    Alginate-based bio-nanocomposite reinforced with poly(2-hydroxypropyl methacrylamide) and magnetite graphene oxide for delivery of etoposide and photothermal therapy
    (Elsevier Sci Ltd, 2024) Işıklan, Nuran; Geyik, Gülcan; Güncüm, Enes
    Recently, bio-nanocomposite nanogels/hydrogels composed of natural polymers and carbon-based nano- materials are attracting increasing attention in the fields of nanomedicine and bioengineering due to their unique properties. In this study, we propose the creation of an innovative multifunctional bio-nanocomposite based on alginate graft copolymer with poly(2-hydroxypropyl methacrylamide) (SA-g-PHPM) and magnetite graphene oxide (mGO) loaded with etoposide (EPS) for drug delivery and photothermal therapy (PTT). The SA-g-PHPM/ mGO bio-nanocomposite was synthesized using an emulsion method and exhibited favorable physicochemical properties. The structural functionalities and surface morphology of the SA-g-PHPM/mGO bio-nanocomposite were comprehensively characterized using spectroscopic techniques, including FT-IR, XRD, UV, DLS, TEM/FESEM, and AFM analyses. Under near-infrared (NIR) irradiation (808 nm, 1 Wcm-(2), 10 min), the SA-g-PHPM/ mGO bio-nanocomposite demonstrated the ability to effectively induce a temperature increase exceeding 29 degrees C. Additionally, exposure to NIR light and magnetic field led to an increased release of EPS whereas an increment in percentage of mGO caused a decreased EPS release. Notably, the synergistic effects of chemotherapy, light-triggered drug release, and PTT collectively contributed to a significant enhancement in lung cancer (H1299) cell death. In conclusion, our findings suggest that the developed SA-g-PHPM/mGO/EPS bionanocomposite serves as an efficient vehicle for multimodal therapy in lung cancer.
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    Öğe
    Preparation, characterization, and evaluation of antibacterial and cytotoxic activity of chitosan-polyethylene glycol nanoparticles loaded with amoxicillin as a novel drug delivery system
    (Taylor & Francis Ltd, 2023) Güncüm, Enes; Işıklan, Nuran; Anlas, Ceren; Bulut, Elif; Bakırel, Tülay
    In this study, nanoparticles of amoxicillin (AMX) were prepared using chitosan (CHI) and polyethylene glycol (PEG). The physicochemical properties of the particles were investigated by FT-IR, DSC, SEM, and zeta potential analyses. The nanoparticles showed a spherical shape, and the average size of formulations was within the range of 696.20 +/- 24.86 - 359.53 +/- 7.41 nm. Zeta potential data demonstrated that the formulations had positive surface charges with a zeta potential range of 21.38 +/- 2.28 - 7.73 +/- 1.66 mV. FTIR analysis showed that the drug was successfully entrapped in the nanoparticles. DSC results suggested that the drug was present in amorphous form in the polymer matrix. In vitro release studies demonstrated that the release pattern consisted of two phases, with an initial burst release followed by a controlled and sustained release. The MTT assay results on mouse fibroblast cell line indicated that the prepared formulations did not affect the viability of the cells. In the in vitro antibacterial activity test, it was found that the drug-loaded nanoparticles have AMX-equivalent antibacterial activity against E. coli, and S. aureus. These findings revealed that the obtained nanoparticles might be a promising and safe nanocarrier system for efficient delivery of AMX.
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    Ultrasonographic and histopathological investigation of the effect of N-acetylcysteine on doxorubicin-induced ovarian and uterine toxicity in rats
    (Bmc, 2024) Ustuner, Evren; Yildirim, Ebru; Macun, Hasan Ceyhun; Ekici, Hüsamettin; Şahin, Yaşar; Güncüm, Enes; Anteplioğlu, Tuğçe
    Background This study aimed to investigate the mitigating effect of N-acetylcysteine (NAC) on doxorubicin (DOX)-induced ovarian and uterine toxicity in rats using laboratory tests, ultrasonographic (US) imaging, and histopathology analysis. Methods Forty-eight rats were divided into six groups (n = 8) as follows: Group A (control) (0.5 mL saline administered intraperitoneally [IP]), Group B (a single 10 mg/kg dose of DOX administered IP on day 1), Group C (a single 10 mg/kg dose of DOX administered IP 24 h before sacrifice), Group D (100 mg/kg of NAC administered IP for 21 days), Group E ( a single 10 mg/kg dose of DOX administered IP on day 1 and 100 mg/kg of NAC administered IP for 21 days), and Group F (100 mg/kg of NAC administered IP for 21 days and a single 10 mg/kg dose of DOX administered IP 24 h before sacrifice). The ovaries were examined using B-mode US on days 1, 14, and 21, and the histopathological examinations of the ovaries and the uterus were undertaken after sacrifice on day 22. Results Histomorphological analyses showed that ovarian weight decreased after DOX administration in Group B but not in Group E. US revealed a transient increase in ovarian size in Group B and E, reverting to baseline levels over time, as well as a progressive increase in peritoneal fluid in Groups B and E. Group B exhibited a significant decrease in the thickness of the endometrium and myometrium and uterine cornual length, which was not observed in Group E. Histopathological examination showed that DOX caused a decline in follicular count, especially in primordial, secondary, and Graafian follicles, and resulted in follicular atresia, predominantly in Group B. Destructive degeneration/necrosis and vascular changes were most prominently seen in the corpus luteum of Groups C and B. In NAC-treated rats (Groups E and F), although germ cell damage was present, atretic follicles and vascular changes, such as hyperemia and congestion, were reduced. The anti-m & uuml;llerian hormone (AMH) level was the highest in Group F. Conclusions NAC, an antioxidant, attenuated DOX-induced gonadotoxicity in rats.