1
|
Kerem G, Önder S, Kılıç A. Locally released dexamethasone and its effects on osteogenic activity at implant-tissue interface. J Biomed Mater Res A 2024; 112:1793-1802. [PMID: 38642019 DOI: 10.1002/jbm.a.37722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Revised: 03/25/2024] [Accepted: 04/01/2024] [Indexed: 04/22/2024]
Abstract
The osseointegration of titanium implants within the host tissue holds crucial importance. The introduction of functional coatings at tissue-implant interface enhances the bioactivity of titanium implants, improves their therapeutic outcomes, and enhances the effectiveness of treatments. In this study, we focused on enhancing the bioactivity of titanium-based implant materials by coating the titanium surfaces with chitosan microspheres, which are loaded with osseointegration-promoting agent dexamethasone (DEX). Initially, chitosan microspheres were successfully produced, followed by DEX loading through diffusion, resulting in a drug loading efficiency of around 50.2 (wt %). The subsequent drug release profile displayed a 24-hour duration, releasing approximately 32.6 (wt %) of the loaded DEX. In cell proliferation assays using human osteosarcoma (SAOS-2) cells, Ti surfaces coated with DEX-loaded chitosan microspheres initially exhibited lower cell numbers compared with DEX-free ones. This observation was attributed to transient osteogenic differentiation effects of DEX, since a notable increase in cell proliferation was observed on the 7th day. Von Kossa staining revealed mineralization beginning on the 14th day, particularly evident in DEX-loaded samples. Moreover, alkaline phosphatase (ALP) activity displayed a pattern of initial increase and subsequent decrease, with DEX release from chitosan microspheres showing a clear influence on the osteogenic differentiation, especially on the 7th day. These findings align with literature, highlighting DEX's potential to enhance osteogenic differentiation and cellular behavior on chitosan microsphere-coated titanium surfaces. This study emphasizes the promising implications for functionalizing surfaces of implant materials with DEX-loaded chitosan microspheres to improve their biocompatibility and bioactivity.
Collapse
Affiliation(s)
- Gizem Kerem
- Department of Molecular Biology and Genetics, Istanbul Technical University, Istanbul, Turkey
| | - Sakip Önder
- Department of Biomedical Engineering, Yildiz Technical University, Istanbul, Turkey
| | - Abdulhalim Kılıç
- Department of Molecular Biology and Genetics, Istanbul Technical University, Istanbul, Turkey
| |
Collapse
|
2
|
Jiang S, Prozeller D, Pereira J, Simon J, Han S, Wirsching S, Fichter M, Mottola M, Lieberwirth I, Morsbach S, Mailänder V, Gehring S, Crespy D, Landfester K. Controlling protein interactions in blood for effective liver immunosuppressive therapy by silica nanocapsules. NANOSCALE 2020; 12:2626-2637. [PMID: 31939969 DOI: 10.1039/c9nr09879h] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Immunosuppression with glucocorticoids is a common treatment for autoimmune liver diseases and after liver transplant, which is however associated with severe side-effects. Targeted delivery of glucocorticoids to inflammatory cells, e.g. liver macrophages and Kupffer cells, is a promising approach for minimizing side effects. Herein, we prepare core-shell silica nanocapsules (SiO2 NCs) via a sol-gel process confined in nanodroplets for targeted delivery of dexamethasone (DXM) for liver immunosuppressive therapy. DXM with concentrations up to 100 mg mL-1 in olive oil are encapsulated while encapsulation efficiency remains over 95% after 15 days. Internalization of NCs by non-parenchymal murine liver cells significantly reduces the release of inflammatory cytokines, indicating an effective suppression of inflammatory response of liver macrophages. Fluorescent and magnetic labeling of the NCs allows for monitoring their intracellular trafficking and biodegradation. Controlled interaction with blood proteins and good colloidal stability in blood plasma are achieved via PEGylation of the NCs. Specific proteins responsible for stealth effect, such as apolipoprotein A-I, apolipoprotein A-IV, and clusterin, are present in large amounts on the PEGylated NCs. In vivo biodistribution investigations prove an efficient accumulation of NCs in the liver, underlining the suitability of the SiO2 NCs as a dexamethasone carrier for treating inflammatory liver diseases.
Collapse
Affiliation(s)
- Shuai Jiang
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - Domenik Prozeller
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - Jorge Pereira
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - Johanna Simon
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany. and Dermatology Clinic, University Medical Center of the Johannes Gutenberg-University, Langenbeckstr. 1, 55131 Mainz, Germany
| | - Shen Han
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - Sebastian Wirsching
- Children's Hospital, University Medical Center of the Johannes-Gutenberg University, Mainz, Germany
| | - Michael Fichter
- Children's Hospital, University Medical Center of the Johannes-Gutenberg University, Mainz, Germany
| | - Milagro Mottola
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - Ingo Lieberwirth
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - Svenja Morsbach
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| | - Volker Mailänder
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany. and Dermatology Clinic, University Medical Center of the Johannes Gutenberg-University, Langenbeckstr. 1, 55131 Mainz, Germany
| | - Stephan Gehring
- Children's Hospital, University Medical Center of the Johannes-Gutenberg University, Mainz, Germany
| | - Daniel Crespy
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany. and Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong 21210, Thailand
| | - Katharina Landfester
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
| |
Collapse
|
3
|
Gao X, Wang YC, Liu Y, Yue Q, Liu Z, Ke M, Zhao S, Li C. Nanoagonist-mediated endothelial tight junction opening: A strategy for safely increasing brain drug delivery in mice. J Cereb Blood Flow Metab 2017; 37:1410-1424. [PMID: 27342320 PMCID: PMC5453461 DOI: 10.1177/0271678x16656198] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Even though opening endothelial tight junctions is an efficient way to up-regulate brain drug delivery, the extravasation of blood-borne components from the compromised tight junctions can result in adverse consequences such as edema and neuronal injuries. In this work, we developed a nanoagonist that temporarily opened tight junctions by signaling adenosine 2A receptor, a type of G protein-coupled receptor expressed on brain capillary endothelial cells. Magnetic resonance imaging demonstrated remarkable blood-brain barrier permeability enhancements and significantly increased brain uptakes of both small molecular and macromolecular paramagnetic agents after nanoagonist administration. Gamma ray imaging and transmission electron microscope observed tight junction opening followed by spontaneous recovery after nanoagonist treatment. Immunofluorescence staining showed the unspoiled basal membrane, pericytes and astrocyte endfeet that enwrapped the vascular endothelium. Importantly, edema, apoptosis and neuronal injuries observed after hypertonic agent mediated tight junction-opening were not observed after nanoagonist intervention. The uncompromised neurovascular units may prevent the leakage of blood-borne constituents into brain parenchyma and accelerate tight junction recovery. Considering blood-brain barrier impermeability is a major obstacle in the treatment of central nervous system diseases, nanoagonist-mediated tight junction opening provides a promising strategy to enhance brain drug delivery with minimized adverse effects.
Collapse
Affiliation(s)
- Xihui Gao
- 1 Key Laboratory of Smart Drug Delivery, Ministry of Education, School of Pharmacy, Fudan University, Shanghai, China
| | - Yuan-Cheng Wang
- 2 Jiangsu Key Laboratory of Molecular and Functional Imaging, Department of Radiology, Zhongda Hospital, Medical School of Southeast University, Nanjing, China
| | - Yikang Liu
- 3 Department of Biomedical Engineering, The Pennsylvania State University, Philadelphia, PA, USA
| | - Qi Yue
- 4 Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Zining Liu
- 1 Key Laboratory of Smart Drug Delivery, Ministry of Education, School of Pharmacy, Fudan University, Shanghai, China
| | - Mengjing Ke
- 1 Key Laboratory of Smart Drug Delivery, Ministry of Education, School of Pharmacy, Fudan University, Shanghai, China
| | - Shengyuan Zhao
- 1 Key Laboratory of Smart Drug Delivery, Ministry of Education, School of Pharmacy, Fudan University, Shanghai, China
| | - Cong Li
- 1 Key Laboratory of Smart Drug Delivery, Ministry of Education, School of Pharmacy, Fudan University, Shanghai, China
| |
Collapse
|
4
|
Urbańska J, Karewicz A, Nowakowska M. Polymeric delivery systems for dexamethasone. Life Sci 2013; 96:1-6. [PMID: 24373835 DOI: 10.1016/j.lfs.2013.12.020] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 11/25/2013] [Accepted: 12/13/2013] [Indexed: 12/28/2022]
Abstract
Glucocorticoids (GCs) are broadly used in the treatment of inflammation and in suppressing hyperactivity of the immune system expressed in allergies, asthma, autoimmune diseases and sepsis. They are pleiotropic in nature, showing a wide range of diverse effects, including those which are harmful for the organism. Dexamethasone (DEX) is one of the most frequently used GCs and is considered as one of the safest. Still serious side-effects have been observed for this drug, mostly due to its hydrophobicity and low bioavailability. The potentially promising polymeric carrier systems to deliver DEX effectively are revised.
Collapse
Affiliation(s)
- Justyna Urbańska
- Faculty of Chemistry, Jagiellonian University, 30-060 Kraków, Ingardena 3, Poland
| | - Anna Karewicz
- Faculty of Chemistry, Jagiellonian University, 30-060 Kraków, Ingardena 3, Poland.
| | - Maria Nowakowska
- Faculty of Chemistry, Jagiellonian University, 30-060 Kraków, Ingardena 3, Poland
| |
Collapse
|
5
|
Heparin crosslinked chitosan microspheres for the delivery of neural stem cells and growth factors for central nervous system repair. Acta Biomater 2013; 9:6834-43. [PMID: 23467042 DOI: 10.1016/j.actbio.2013.02.043] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2012] [Revised: 02/25/2013] [Accepted: 02/26/2013] [Indexed: 11/22/2022]
Abstract
An effective paradigm for transplanting large numbers of neural stem cells after central nervous system (CNS) injury has yet to be established. Biomaterial scaffolds have shown promise in cell transplantation and in regenerative medicine, but improved scaffolds are needed. In this study we designed and optimized multifunctional and biocompatible chitosan-based films and microspheres for the delivery of neural stem cells and growth factors for CNS injuries. The chitosan microspheres were fabricated by coaxial airflow techniques, with the sphere size controlled by varying the syringe needle gauge and the airflow rate. When applying a coaxial airflow at 30 standard cubic feet per hour, ∼300μm diameter spheres were reproducibly generated that were physically stable yet susceptible to enzymatic degradation. Heparin was covalently crosslinked to the chitosan scaffolds using genipin, which bound fibroblast growth factor-2 (FGF-2) with high affinity while retaining its biological activity. At 1μgml(-1) approximately 80% of the FGF-2 bound to the scaffold. A neural stem cell line, GFP+RG3.6 derived from embryonic rat cortex, was used to evaluate cytocompatibility, attachment and survival on the crosslinked chitosan-heparin complex surfaces. The MTT assay and microscopic analysis revealed that the scaffold containing tethered FGF-2 was superior in sustaining survival and growth of neural stem cells compared to standard culture conditions. Altogether, our results demonstrate that this multifunctional scaffold possesses good cytocompatibility and can be used as a growth factor delivery vehicle while supporting neural stem cell attachment and survival.
Collapse
|
6
|
Pignatello R, Stancampiano AHS, Ventura CA, Puglisi G. Dexamethasone sodium phosphate-loaded Chitosan based delivery systems for buccal application. J Drug Target 2008; 15:603-10. [DOI: 10.1080/10611860701502806] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
7
|
Abstract
Rapid and proper healing is important in the treatment of skin wounds. The dressing achieves the functions of the natural skin by protecting the wound area from the bulk loss of tissue and creating an effective barrier to outside contaminants without increasing the bacterial load on the wound surface. There are many wound dressings available on the market which can be used in the healing process. Different dressings have been used according to the condition of the wound and the phases of wound healing. Biodegradable polymers are being widely used in drug delivery and also in wound healing. These polymers that are applicable as a wound dressing protect the wound site against unwanted external effects, inhibit wound contraction, and, if possible, stimulate the healing process. Micro- and nanoparticulates are currently being evaluated as a potential drug delivery in clinical applications. Growth factors also play a vital role in wound healing. Polymers used in wound healing act as sustained release vehicles for growth factors. Controlled release of growth factors from microspheres has provided a higher degree of healing in the wound areas. This review is intended to provide information regarding the various formulations and microparticulate systems used in wound healing.
Collapse
Affiliation(s)
- Zelihagül Değim
- Department of Pharmaceutical Technology, Gazi University Faculty of Pharmacy, Ankara, Turkey.
| |
Collapse
|
8
|
Okutan O, Turkoglu OF, Gok HB, Beskonakli E. Neuroprotective effect of erythropoietin after experimental cold injury-induced vasogenic brain edema in rats. ACTA ACUST UNITED AC 2008; 70:498-502. [PMID: 18291472 DOI: 10.1016/j.surneu.2007.07.061] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2007] [Accepted: 07/18/2007] [Indexed: 11/16/2022]
Abstract
BACKGROUND The aims of this study were to evaluate the efficiency of EPO in the treatment of cold injury-induced brain edema, apoptosis, and inflammation and to compare its effectiveness with DSP. METHODS One hundred fifteen adult male Sprague-Dawley rats weighing between 280 and 300 g were used for the study. Rats were divided into 5 groups. Controls received craniotomy only. The injury group underwent cold injury and had no medication. In the EPO group, a single dose of 1000 IU/kg body weight of EPO was administered. The DSP group received 0.2 mg/kg body weight of DSP. The vehicle group received a vehicle solution containing human serum albumin, which is the solvent for EPO. Brain edema was formed by cold injury using metal sterile rods with a diameter of 4 mm that were previously cooled at -80 degrees C. Twenty-four hours after the injury, animals were decapitated and brain tissues were investigated for brain edema, tissue MPO and caspase-3 levels, and ultrastructure. RESULTS A significant increase in brain water content was revealed in injury group of rats at 24 hours after cold injury. Injury significantly increased tissue MPO and caspase-3 levels and resulted in ultrastructural damage. Both EPO and DSP markedly decreased tissue MPO and caspase-3 levels and preserved ultrastructure of the injured brain cortex. CONCLUSIONS Erythropoietin and DSP were found to be neuroprotective in cold injury-induced brain edema model in rats via anti-apoptotic and anti-inflammatory actions.
Collapse
Affiliation(s)
- Ozerk Okutan
- Department of Neurosurgery, Ankara Ataturk Research and Education Hospital, Ankara, Turkey.
| | | | | | | |
Collapse
|
9
|
Turkoglu OF, Eroglu H, Okutan O, Tun MK, Bodur E, Sargon MF, Öner L, Beskonaklı E. A comparative study of treatment for brain edema: Magnesium sulphate versus dexamethasone sodium phosphate. J Clin Neurosci 2008; 15:60-5. [DOI: 10.1016/j.jocn.2007.03.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2006] [Revised: 08/11/2006] [Accepted: 03/08/2007] [Indexed: 11/15/2022]
|
10
|
Abstract
Chitosan is a partially deacetylated polymer obtained from the alkaline deacetylation of chitin, which is a glucose-based, unbranched polysaccharide that occurs widely in nature as the principal component of exoskeletons of crustaceans and insects, as well as of the cell walls of some bacteria and fungi. Chitosan exhibits a variety of physicochemical and biological properties resulting in numerous applications in fields such as waste water treatment, agriculture, fabric and textiles, cosmetics, nutritional enhancement and food processing. In addition to its lack of toxicity and allergenicity, its biocompatibility, biodegradability and bioactivity make it a very attractive substance for diverse applications as a biomaterial in the pharmaceutical and medical fields. This review takes a closer look at the biomedical applications of chitosan microspheres. Based on recent research and existing products, some new and potential future approaches in this fascinating area are discussed.
Collapse
Affiliation(s)
- Jaleh Varshosaz
- Department of Pharmaceutics, School of Pharmacy, Isfahan University of Medical Sciences, Isfahan, Iran.
| |
Collapse
|
11
|
Zhang L, Zhang WP, Chen KD, Qian XD, Fang SH, Wei EQ. Caffeic acid attenuates neuronal damage, astrogliosis and glial scar formation in mouse brain with cryoinjury. Life Sci 2006; 80:530-7. [PMID: 17074364 DOI: 10.1016/j.lfs.2006.09.039] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2006] [Revised: 08/26/2006] [Accepted: 09/29/2006] [Indexed: 12/01/2022]
Abstract
Traumatic brain injury induces neuron damage in early phase, and astrogliosis and the formation of the glial scar in late phase. Caffeic acid (3, 4-dihydroxycinnamic acid), one of the natural phenolic compounds, exerts neuroprotective effects against ischemic brain injuries with anti-oxidant and anti-inflammatory properties, and by scavenging reactive species. However, whether caffeic acid has protective effects against traumatic brain injury is unknown. Therefore, we determined the effect of caffeic acid on the lesion in the early (1 day) and late phases (7 to 28 days) of cryoinjury in mice. We found that caffeic acid (10 and 50 mg/kg, i.p., for 7 days after cryoinjury) reduced the lesion area and attenuated the neuron loss around the lesion core 1 to 28 days, but attenuated the neuron loss in the lesion core only 1 day after cryoinjury. Moreover, caffeic acid attenuated astrocyte proliferation, glial scar wall formation and glial fibrillary acidic protein (GFAP) protein expression in the late phase of cryoinjury (7 to 28 days). Caffeic acid also inhibited the reduction of superoxide dismutase activity and the increase in malondialdehyde content in the brain 1 day after cryoinjury. These results indicate that caffeic acid exerts a protective effect in traumatic brain injury, especially on glial scar formation in the late phase, which at least is associated with its anti-oxidant ability.
Collapse
Affiliation(s)
- Lei Zhang
- Department of Pharmacology, School of Medicine, Zhejiang University, 388, Yu Hang Tang Road, Hangzhou 310058, People's Republic of China
| | | | | | | | | | | |
Collapse
|