Yazar "Bal-Ozturk, Ayca" seçeneğine göre listele

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    Application of Convergent Science and Technology toward Ocular Disease Treatment
    (Mdpi, 2023) Bal-Ozturk, Ayca; Ozcan-Bulbul, Ece; Gultekin, Hazal Ezgi; Cecen, Berivan; Demir, Ebru; Zarepour, Atefeh; Cetinel, Sibel
    Eyes are one of the main critical organs of the body that provide our brain with the most information about the surrounding environment. Disturbance in the activity of this informational organ, resulting from different ocular diseases, could affect the quality of life, so finding appropriate methods for treating ocular disease has attracted lots of attention. This is especially due to the ineffectiveness of the conventional therapeutic method to deliver drugs into the interior parts of the eye, and the also presence of barriers such as tear film, blood-ocular, and blood-retina barriers. Recently, some novel techniques, such as different types of contact lenses, micro and nanoneedles and in situ gels, have been introduced which can overcome the previously mentioned barriers. These novel techniques could enhance the bioavailability of therapeutic components inside the eyes, deliver them to the posterior side of the eyes, release them in a controlled manner, and reduce the side effects of previous methods (such as eye drops). Accordingly, this review paper aims to summarize some of the evidence on the effectiveness of these new techniques for treating ocular disease, their preclinical and clinical progression, current limitations, and future perspectives.
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    Eggshell integrated GelMA/CSMA/HyMA hybrid hydrogels for cell therapy/tissue engineering
    (Wiley, 2023) Yuce-Erarslan, Elif; Izbudak, Burcin; Kizilkurtlu, Ahmet Akif; Topal, Merve; Akpek, Ali; Bal-Ozturk, Ayca
    The use of biocompatible materials with improved behaviors for potential applications in the area of tissue engineering has increased as the developments in biomaterials have increased in recent years. Current approaches concentrate on hybrid combinations of synthetic and natural polymers. In this context, obtaining porous scaffolds with good mechanical properties is still challenging. Herein, a hybrid tissue scaffold consisting of methacrylated gelatin (GelMA), methacrylated chondroitin sulfate (CSMA), methacrylated hyaluronic acid (HyMA) and eggshell particles with enhanced pore morphology and mechanical property was fabricated by photo-polymerization. The effect of different amounts of eggshell particles on the behaviors of hybrid hydrogel scaffolds was investigated. It was determined by scanning electron microscope analysis (SEM) that the particles were well-dispersed and triggered the formation of an interconnected porous structure in the hybrid tissue scaffold containing 10% by weight of eggshell particles. It was concluded that the mechanical behaviors of the hybrid tissue scaffold containing 10% by weight of eggshell particles improved by 47% compared to the neat hydrogel scaffold. There were no toxic effects of eggshell particles-integrated scaffolds against osteoblast cells. In addition, cells successfully adhered onto the scaffolds and proliferated. Consequently, GelMA/CSMA/HyMA scaffolds containing 10% eggshell particles were found to be biocompatible and suitable for cell therapy and tissue engineering applications.
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    Gellan gum/guar gum films incorporated with honey as potential wound dressings
    (Springer, 2024) Bal-Ozturk, Ayca; Torkay, Gulsah; Idil, Neslihan; Ozkahraman, Bengi; Ozbas, Zehra
    In this article, the solvent casting technique was used to prepare wound dressing films based on honey incorporated gellan gum and guar gum biopolymers, and presented the effect of the honey concentration (in the range of 0-10 g on each film). The film structures were assessed by Fourier transform infrared spectroscopy, differential scanning calorimetry, and thermogravimetric analysis. The physical properties of the films were investigated by swelling, degradation, mechanical tests, and water vapor transmission rate. The swelling capacity of the films decreased with an increase in the honey amount, and the presence of honey increased the degradation percentage of the films. The incorporation of honey significantly enhanced the tensile strength of the film, and the increase in honey concentration caused a decrease in the water vapor transmission rate values. The antioxidant activity of the films was determined by DPPH assay, and the films showed good antioxidant abilities. The biocompatibility of the films was evaluated by using an MTT assay with biofilm extract against human skin fibroblast cells, and the wound healing activity of the films was evaluated via in vitro scratch assay. The obtained outcomes showed that the synthesized non-cytotoxic and biocompatible films supported cell migration and proliferation.
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    Hyperbranched polymer-based nanoparticle drug delivery platform for the nucleus-targeting in cancer therapy
    (Elsevier, 2023) Bal-Ozturk, Ayca; Tietilu, Sherif Domingo; Yuecel, Oguz; Erol, Tugba; Akguner, Zeynep Puren; Darici, Hakan; Alarcin, Emine
    Hyperbranched polymers (HPB) are drawing attention as one of the drug delivery platforms that can encapsulate drugs owing to the internal voids in their three-dimensional construct. It is feasible to develop HBP-based nano -sized drug delivery platforms and improve the efficacy of cancer treatment due to its potential properties. In particular, the contribution of targeted drug delivery systems that can target malignant tissues in the treatment processes is undeniable. For this purpose, modifying an HBP-based nanoparticle delivery system with a targeting molecule is vital. In this study, we synthesized folic acid-modified HBP-based nanoparticles and their physical (DLS, zeta potential) and chemical (FTIR, NMR) characterizations were performed, and finally 5-Fluorouracil (5-FU) was loaded as a model active agent. The release properties (UV-VIS) and release kinetic models of 5-FU-loaded folic acid-modified nanoparticles were investigated in different pHs. In vitro cellular activities (MTT, cellular uptake) and targeting properties to the folate receptor (FR) were determined by flow cytometry on HeLa (FR, +) and L929 (FR,-) cells. According to all the results, folic acid-modified HBP-based nanoparticles were efficiently transported to the cell nucleus in the targeted FR + cells, and internalization of nanoparticles in HeLa cells is similar to 2.5 times higher than L929 cells. All results suggest that folic acid modification to the nanoparticles is critical in folate receptor-positive cancer treatment.
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    Injectable and self-healing dual crosslinked gelatin/kappa-carrageenan methacryloyl hybrid hydrogels via host-guest supramolecular interaction for wound healing
    (Wiley, 2023) Yilmaz-Aykut, Dilara; Torkay, Gulsah; Kasgoz, Alper; Shin, Su Ryon; Bal-Ozturk, Ayca; Deligoz, Huseyin
    Injectable hydrogels based on natural polymers have shown great potential for various tissue engineering applications, such as wound healing. However, poor mechanical properties and weak self-healing ability are still major challenges. In this work, we introduce a host-guest (HG) supramolecular interaction between acrylate-beta-cyclodextrin (Ac-beta-CD) conjugated on methacrylated kappa-carrageenan (MA-kappa-CA) and aromatic residues on gelatin to provide self-healing characteristics. We synthesize an MA-kappa-CA to conjugate Ac-beta-CD and fabricate dual crosslinked hybrid hydrogels with gelatin to mimic the native extracellular matrix (ECM). The dual crosslinking occurs on the MA-kappa-CA backbone through the addition of KCl and photocrosslinking process, which enhances mechanical strength and stability. The hybrid hydrogels exhibit shear-thinning, self-healing, and injectable behavior, which apply easily under a minimally invasive manner and contribute to shear stress during the injection. Invitro studies indicate enhanced cell viability. Furthermore, scratch assays are performed to examine cell migration and cell-cell interaction. It is envisioned that the combination of self-healing and injectable dual crosslinked hybrid hydrogels with HG interactions display a promising and functional biomaterial platform for wound healing applications.
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    Tackling chronic wound healing using nanomaterials: advancements, challenges, and future perspectives
    (Elsevier, 2023) Yasayan, Gokcen; Nejati, Omid; Ceylan, Asli F.; Karasu, Cimen; Ugur, Pelin Kelicen; Bal-Ozturk, Ayca; Zarepour, Atefeh
    Chronic wounds are known as one of the biggest health challenges, especially in the case of diabetes patients, which annually engages millions of patients, and its management imposes an exorbitant economic cost on so-cieties worldwide. Therefore, there is an unmet need to find novel therapeutic methods with lower costs and higher efficiency. In recent years, a wide range of nanomaterials (NMs) has been utilized and shown promising results in treating different types of chronic wounds via playing a vital role as carriers for therapeutic agents or directly act as the therapeutic compound. NMs could affect different phases of the healing process, from he-mostasis to remodeling, via influencing various intracellular factors. Towards this, the current review aims to provide the most recent research progress and prospect on the application of different NMs in chronic wound healing, particularly focusing on their effects on intracellular factors. The chronic wounds and intracellular pathways involved in this process are elaborated, and several NMs-based therapeutic agents used for chronic wound healing are described. The potential pitfalls and challenges of utilizing NMs in chronic wound healing are covered, and future perspectives toward more successful translational applications are presented.