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Shafique M, Sohail M, Minhas MU, Khaliq T, Kousar M, Khan S, Hussain Z, Mahmood A, Abbasi M, Aziz HC, Shah SA. Bio-functional hydrogel membranes loaded with chitosan nanoparticles for accelerated wound healing. Int J Biol Macromol 2020; 170:207-221. [PMID: 33359612 DOI: 10.1016/j.ijbiomac.2020.12.157] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 12/17/2020] [Accepted: 12/20/2020] [Indexed: 02/06/2023]
Abstract
Wounds are often recalcitrant to traditional wound dressings and a bioactive and biodegradable wound dressing using hydrogel membranes can be a promising approach for wound healing applications. The present research aimed to design hydrogel membranes based on hyaluronic acid, pullulan and polyvinyl alcohol and loaded with chitosan based cefepime nanoparticles for potential use in cutaneous wound healing. The developed membranes were evaluated using dynamic light scattering, proton nuclear magnetic resonance, Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. The results indicated the novel crosslinking and thermal stability of the fabricated hydrogel membrane. The in vitro analysis demonstrates that the developed membrane has water vapors transmission rate (WVTR) between 2000 and 2500 g/m2/day and oxygen permeability between 7 and 14 mg/L, which lies in the range of an ideal dressing. The swelling capacity and surface porosity to liberate encapsulated drug (cefepime) in a sustained manner and 88% of drug release was observed. The cefepime loaded hydrogel membrane demonstrated a higher zone of inhibition against Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli and excisional rat model exhibit expeditious recovery rate. The developed hydrogel membrane loaded with cefepime nanoparticles is a promising approach for topical application and has greater potential for an accelerated wound healing process.
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Affiliation(s)
- Maryam Shafique
- Department of Pharmacy, COMSATS University, Abbottabad Campus, Islamabad 22010, Pakistan
| | - Muhammad Sohail
- Department of Pharmacy, COMSATS University, Abbottabad Campus, Islamabad 22010, Pakistan.
| | | | - Touba Khaliq
- Department of Pharmacy, COMSATS University, Abbottabad Campus, Islamabad 22010, Pakistan
| | - Mubeen Kousar
- Department of Pharmacy, COMSATS University, Abbottabad Campus, Islamabad 22010, Pakistan
| | - Shahzeb Khan
- Department of Pharmacy, University of Malakand, Lower Dir, KPK, Pakistan; Discipline of Pharmaceutical Sciences, School of Health Sciences, UKZN, Durban, South Africa
| | - Zahid Hussain
- Department of Pharmaceutics & Pharmaceutical Technology, College of Pharmacy, University of Sharjah, Sharjah 27272, United Arab Emirates; Research Institute for Medical and Health Sciences (SIMHR), University of Sharjah, Sharjah 27272, United Arab Emirates
| | - Arshad Mahmood
- Collage of Pharmacy, Al Ain University, Abu Dhabi, United Arab Emirates
| | - Mudassir Abbasi
- Department of Pharmacy, COMSATS University, Abbottabad Campus, Islamabad 22010, Pakistan
| | - Heather C Aziz
- Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin, Austin, TX, USA
| | - Syed Ahmed Shah
- Department of Pharmacy, COMSATS University, Abbottabad Campus, Islamabad 22010, Pakistan
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Zahradník J, Kolářová L, Peleg Y, Kolenko P, Svidenská S, Charnavets T, Unger T, Sussman JL, Schneider B. Flexible regions govern promiscuous binding ofIL‐24 to receptorsIL‐20R1 andIL‐22R1. FEBS J 2019; 286:3858-3873. [DOI: 10.1111/febs.14945] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 05/05/2019] [Accepted: 05/30/2019] [Indexed: 11/30/2022]
Affiliation(s)
- Jiří Zahradník
- Institute of Biotechnology of the Czech Academy of Sciences BIOCEV Vestec Czech Republic
- Weizmann Institute of Science Rehovot Israel
| | - Lucie Kolářová
- Institute of Biotechnology of the Czech Academy of Sciences BIOCEV Vestec Czech Republic
| | - Yoav Peleg
- Weizmann Institute of Science Rehovot Israel
| | - Petr Kolenko
- Institute of Biotechnology of the Czech Academy of Sciences BIOCEV Vestec Czech Republic
- Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague Prague Czech Republic
| | - Silvie Svidenská
- Institute of Biotechnology of the Czech Academy of Sciences BIOCEV Vestec Czech Republic
| | - Tatsiana Charnavets
- Institute of Biotechnology of the Czech Academy of Sciences BIOCEV Vestec Czech Republic
| | - Tamar Unger
- Weizmann Institute of Science Rehovot Israel
| | | | - Bohdan Schneider
- Institute of Biotechnology of the Czech Academy of Sciences BIOCEV Vestec Czech Republic
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Lubkowski J, Sonmez C, Smirnov SV, Anishkin A, Kotenko SV, Wlodawer A. Crystal Structure of the Labile Complex of IL-24 with the Extracellular Domains of IL-22R1 and IL-20R2. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2018; 201:2082-2093. [PMID: 30111632 PMCID: PMC6143405 DOI: 10.4049/jimmunol.1800726] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 07/11/2018] [Indexed: 11/19/2022]
Abstract
Crystal structure of the ternary complex of human IL-24 with two receptors, IL-22R1 and IL-20R2, has been determined at 2.15 Å resolution. A crystallizable complex was created by a novel approach involving fusing the ligand with a flexible linker to the presumed low-affinity receptor, and coexpression of this construct in Drosophila S2 cells together with the presumed high-affinity receptor. This approach, which may be generally applicable to other multiprotein complexes with low-affinity components, was necessitated by the instability of IL-24 expressed by itself in either bacteria or insect cells. Although IL-24 expressed in Escherichia coli was unstable and precipitated almost immediately upon its refolding and purification, a small fraction of IL-24 remaining in the folded state was shown to be active in a cell-based assay. In the crystal structure presented here, we found that two cysteine residues in IL-24 do not form a predicted disulfide bond. Lack of structural restraint by disulfides, present in other related cytokines, is most likely reason for the low stability of IL-24. Although the contact area between IL-24 and IL-22R1 is larger than between the cytokine and IL-20R2, calculations show the latter interaction to be slightly more stable, suggesting that the shared receptor (IL-20R2) might be the higher-affinity receptor.
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Affiliation(s)
- Jacek Lubkowski
- Macromolecular Crystallography Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702;
| | - Cem Sonmez
- Macromolecular Crystallography Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702
| | - Sergey V Smirnov
- Department of Microbiology, Biochemistry and Molecular Genetics, Center for Immunity and Inflammation, Rutgers Cancer Institute of New Jersey at University Hospital, New Jersey Medical School, Rutgers University, Newark, NJ 07103; and
| | - Andriy Anishkin
- Biology Department, University of Maryland, College Park, MD 20742
| | - Sergei V Kotenko
- Department of Microbiology, Biochemistry and Molecular Genetics, Center for Immunity and Inflammation, Rutgers Cancer Institute of New Jersey at University Hospital, New Jersey Medical School, Rutgers University, Newark, NJ 07103; and
| | - Alexander Wlodawer
- Macromolecular Crystallography Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702
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AraBAD Based Toolkit for Gene Expression and Metabolic Robustness Improvement in Synechococcus elongatus. Sci Rep 2017; 7:18059. [PMID: 29273782 PMCID: PMC5741739 DOI: 10.1038/s41598-017-17035-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Accepted: 11/20/2017] [Indexed: 12/14/2022] Open
Abstract
As a novel chemical production platform, controllable and inducible modules in Synechococcus elongatus plus the ability of working in diurnal conditions are necessary. To the endeavors, inducible promoters, such as PTrc, have been refined from Escherichia coli, but the inducer isopropyl-β-D-thiogalactoside may cause several side-effects. Meanwhile, to promote the efficiency, photomixotrophic cultivation has been applied in S. elongatus with the additional organic carbon sources. In this study, we developed L-arabinose based modules consisted of both the PBAD inducible promoter and the metabolism of L-arabinose in S. elongatus, since L-arabinose is an ideal heterologous feedstock for its availability and economic and environmental benefits. As expected, we achieved homogeneous and linear expression of the exogenous reporter through the PBAD promoter, and the biomass increased in diurnal light condition via introducing L-arabinose metabolism pathway. Moreover, the combined AraBAD based toolkit containing both the PBAD inducible module and the L-arabinose metabolism module could obtain gene expression and metabolic robustness improvement in S. elongatus. With the only additive L-arabinose, the novel strategy may generate a win-win scenario for both regulation and metabolism for autotrophic bio-production platforms.
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Fan X, Chen R, Chen L, Liu L. Enhancement of alpha-ketoglutaric acid production from l-glutamic acid by high-cell-density cultivation. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2016.01.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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