1
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Hopkins SP, Pant J, Goudie MJ, Nguyen DT, Handa H. Electrospun Bioabsorbable Fibers Containing S-Nitrosoglutathione for Tissue Engineering Applications. ACS APPLIED BIO MATERIALS 2020; 3:7677-7686. [PMID: 35019507 DOI: 10.1021/acsabm.0c00862] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Blended and coaxial fibers comprising polycaprolactone and gelatin, containing the endogenous nitric oxide (NO) donor S-nitrosoglutathione (GSNO), were electrospun. Both types of fibers had their NO release profiles tested under physiological conditions to examine their potential applications as biomedical scaffolds. The coaxial fibers exhibited a prolonged and consistent release of NO over the course of 4 d from the core-encapsulated GSNO, while the blended fibers had a large initial release and leaching of GSNO that was exhausted over a shorter period of time. Bacterial testing of both fiber scaffolds was conducted over a 24 h period against Staphylococcus aureus (S. aureus) and demonstrated a 3-log reduction in bacterial viability. In addition, no cytotoxic response was reported when the material was tested on mouse fibroblast cells in vitro. These fibrous matrices were also shown to support cell growth, attachment, and overall activity of fibroblasts when exposed to NO, especially when GSNO was encapsulated within coaxial fibers. From an application point of view, these NO-releasing fibers offer great potential in tissue engineering and biomedical applications because of the crucial role of NO in regulating a variety of biological processes in humans such as angiogenesis, tissue remodeling, and eliminating foreign pathogens.
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Affiliation(s)
- Sean P Hopkins
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens 30602, Georgia, United States
| | - Jitendra Pant
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens 30602, Georgia, United States
| | - Marcus J Goudie
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens 30602, Georgia, United States
| | - Dieu Thao Nguyen
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens 30602, Georgia, United States
| | - Hitesh Handa
- School of Chemical, Materials and Biomedical Engineering, University of Georgia, Athens 30602, Georgia, United States
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2
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Zhang Q, Stachelek SJ, Inamdar VV, Alferiev I, Nagaswami C, Weisel JW, Hwang JH, Meyerhoff ME. Studies of combined NO-eluting/CD47-modified polyurethane surfaces for synergistic enhancement of biocompatibility. Colloids Surf B Biointerfaces 2020; 192:111060. [PMID: 32450498 PMCID: PMC7572543 DOI: 10.1016/j.colsurfb.2020.111060] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 03/15/2020] [Accepted: 04/13/2020] [Indexed: 12/22/2022]
Abstract
The blood compatibility of various intravascular (IV) devices (e.g., catheters, sensors, etc.) is compromised by activation of platelets that can cause thrombus formation and device failure. Such devices also carry a high risk of microbial infection. Recently, nitric oxide (NO) releasing polymers/devices have been proposed to reduce these clinical problems. CD47, a ubiquitously expressed transmembrane protein with proven anti-inflammation/anti-platelet properties when immobilized on polymeric surfaces, is a good candidate to complement NO release in both effectiveness and longevity. In this work, we successfully appended CD47 peptides (pepCD47) to the surface of biomedical grade polyurethane (PU) copolymers. SIRPα binding and THP-1 cell attachment experiments strongly suggested that the pepCD47 retains its biological properties when bound to PU films. In spite of the potentially high reactivity of NO toward various amino acid residues in CD47, the efficacy of surface-immobilized pepCD47 to prevent inflammatory cell attachment was not inhibited after being subjected to a high flux of NO for three days, demonstrating excellent compatibility of the two species. We further constructed a CD47 surface immobilized silicone tubing filled with NO releasing S-nitrosoglutathione/ascorbic acid (GSNO/AA) solution for synergistic biocompatibility evaluation. Via an ex vivo Chandler loop model, we demonstrate for the first time that NO release and CD47 modification could function synergistically at the blood/material interface and produce greatly enhanced anti-inflammatory/anti-platelet effects. This concept should be readily implementable to create a new generation of thromboresistant/antimicrobial implantable devices.
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Affiliation(s)
- Qi Zhang
- Department of Chemistry, The University of Michigan, Ann Arbor, MI 48109-1055, United States
| | - Stanley J Stachelek
- Division of Cardiology-Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, United States; Perelman School of Medicine, The University of Pennsylvania, Philadelphia, PA, 19104, United States
| | - Vaishali V Inamdar
- Division of Cardiology-Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, United States; Perelman School of Medicine, The University of Pennsylvania, Philadelphia, PA, 19104, United States
| | - Ivan Alferiev
- Division of Cardiology-Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, 19104, United States; Perelman School of Medicine, The University of Pennsylvania, Philadelphia, PA, 19104, United States
| | - Chandrasekaran Nagaswami
- Department of Cell and Developmental Biology, Perelman School of Medicine, The University of Pennsylvania, Philadelphia, PA, 19104, United States
| | - John W Weisel
- Department of Cell and Developmental Biology, Perelman School of Medicine, The University of Pennsylvania, Philadelphia, PA, 19104, United States
| | - Jeong Hyun Hwang
- Department of Chemistry, The University of Michigan, Ann Arbor, MI 48109-1055, United States
| | - Mark E Meyerhoff
- Department of Chemistry, The University of Michigan, Ann Arbor, MI 48109-1055, United States
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Querido MM, Aguiar L, Neves P, Pereira CC, Teixeira JP. Self-disinfecting surfaces and infection control. Colloids Surf B Biointerfaces 2019; 178:8-21. [PMID: 30822681 PMCID: PMC7127218 DOI: 10.1016/j.colsurfb.2019.02.009] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 02/04/2019] [Accepted: 02/05/2019] [Indexed: 12/27/2022]
Abstract
According to World Health Organization, every year in the European Union, 4 million patients acquire a healthcare associated infection. Even though some microorganisms represent no threat to healthy people, hospitals harbor different levels of immunocompetent individuals, namely patients receiving immunosuppressors, with previous infections, or those with extremes of age (young children and elderly), requiring the implementation of effective control measures. Public spaces have also been found an important source of infectious disease outbreaks due to poor or none infection control measures applied. In both places, surfaces play a major role on microorganisms' propagation, yet they are very often neglected, with very few guidelines about efficient cleaning measures and microbiological assessment available. To overcome surface contamination problems, new strategies are being designed to limit the microorganisms' ability to survive over surfaces and materials. Surface modification and/or functionalization to prevent contamination is a hot-topic of research and several different approaches have been developed lately. Surfaces with anti-adhesive properties, with incorporated antimicrobial substances or modified with biological active metals are some of the strategies recently proposed. This review intends to summarize the problems associated with contaminated surfaces and their importance on infection spreading, and to present some of the strategies developed to prevent this public health problem, namely some already being commercialized.
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Affiliation(s)
- Micaela Machado Querido
- National Institute of Health, Environmental Health Department, Porto, Portugal; EPIUnit - Institute of Public Health, University of Porto, Porto, Portugal
| | - Lívia Aguiar
- National Institute of Health, Environmental Health Department, Porto, Portugal
| | - Paula Neves
- National Institute of Health, Environmental Health Department, Porto, Portugal
| | - Cristiana Costa Pereira
- National Institute of Health, Environmental Health Department, Porto, Portugal; EPIUnit - Institute of Public Health, University of Porto, Porto, Portugal.
| | - João Paulo Teixeira
- National Institute of Health, Environmental Health Department, Porto, Portugal; EPIUnit - Institute of Public Health, University of Porto, Porto, Portugal
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4
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Rolim WR, Pieretti JC, Renó DLS, Lima BA, Nascimento MHM, Ambrosio FN, Lombello CB, Brocchi M, de Souza ACS, Seabra AB. Antimicrobial Activity and Cytotoxicity to Tumor Cells of Nitric Oxide Donor and Silver Nanoparticles Containing PVA/PEG Films for Topical Applications. ACS APPLIED MATERIALS & INTERFACES 2019; 11:6589-6604. [PMID: 30653288 DOI: 10.1021/acsami.8b19021] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Because of their antibacterial activity, silver nanoparticles (AgNPs) have been explored in biomedical applications. Similarly, nitric oxide (NO) is an important endogenous free radical with an antimicrobial effect and toxicity toward cancer cells that plays pivotal roles in several processes. In this work, biogenic AgNPs were prepared using green tea extract and the principles of green chemistry, and the NO donor S-nitrosoglutathione (GSNO) was prepared by the nitrosation of glutathione. To enhance the potentialities of GSNO and AgNPs in biomedical applications, the NO donor and metallic nanoparticles were individually or simultaneously incorporated into polymeric solid films of poly(vinyl alcohol) (PVA) and poly(ethylene glycol) (PEG). The resulting solid nanocomposites were characterized by several techniques, and the diffusion profiles of GSNO and AgNPs were investigated. The results demonstrated the formation of homogeneous PVA/PEG solid films containing GSNO and nanoscale AgNPs that are distributed in the polymeric matrix. PVA/PEG films containing AgNPs demonstrated a potent antibacterial effect against Gram-positive and Gram-negative bacterial strains. GSNO-containing PVA/PEG films demonstrated toxicity toward human cervical carcinoma and human prostate cancer cell lines. Interestingly, the incorporation of AgNPs in PVA/PEG/GSNO films had a superior effect on the decrease of cell viability of both cancer cell lines, compared with cells treated with films containing GSNO or AgNPs individually. To our best knowledge, this is the first report to describe the preparation of PVA/PEG solid films containing GSNO and/or biogenically synthesized AgNPs. These polymeric films might find important biomedical applications as a solid material with antimicrobial and antitumorigenic properties.
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Affiliation(s)
| | | | | | - Bruna A Lima
- Tropical Disease Laboratory, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology , University of Campinas (UNICAMP) , Campinas , São Paulo 13083-862 , Brazil
| | | | | | | | - Marcelo Brocchi
- Tropical Disease Laboratory, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology , University of Campinas (UNICAMP) , Campinas , São Paulo 13083-862 , Brazil
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Poly-ε-caprolactone/polysulfhydrylated polyester blend: A platform for topical and degradable nitric oxide-releasing materials. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.09.046] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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6
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Neufeld MJ, Lutzke A, Jones WM, Reynolds MM. Nitric Oxide Generation from Endogenous Substrates Using Metal-Organic Frameworks: Inclusion within Poly(vinyl alcohol) Membranes To Investigate Reactivity and Therapeutic Potential. ACS APPLIED MATERIALS & INTERFACES 2017; 9:35628-35641. [PMID: 28976734 PMCID: PMC6322413 DOI: 10.1021/acsami.7b11846] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Cu-BTTri (H3BTTri = 1,3,5-tris[1H-1,2,3-triazol-5-yl]benzene) is a water-stable, copper-based metal-organic framework (MOF) that exhibits the ability to generate therapeutic nitric oxide (NO) from S-nitrosothiols (RSNOs) available within the bloodstream. Immobilization of Cu-BTTri within a polymeric membrane may allow for localized NO generation at the blood-material interface. This work demonstrates that Cu-BTTri can be incorporated within hydrophilic membranes prepared from poly(vinyl alcohol) (PVA), a polymer that has been examined for numerous biomedical applications. Following immobilization, the ability of the MOF to produce NO from the endogenous RSNO S-nitrosoglutathione (GSNO) is not significantly inhibited. Poly(vinyl alcohol) membranes containing dispersions of Cu-BTTri were tested for their ability to promote NO release from a 10 μM initial GSNO concentration at pH 7.4 and 37 °C, and NO production was observed at levels associated with antithrombotic therapeutic effects without significant copper leaching (<1%). Over 3.5 ± 0.4 h, 10 wt % Cu-BTTri/PVA membranes converted 97 ± 6% of GSNO into NO, with a maximum NO flux of 0.20 ± 0.02 nmol·cm-2·min-1. Furthermore, it was observed for the first time that Cu-BTTri is capable of inducing NO production from GSNO under aerobic conditions. At pH 6.0, the NO-forming reaction of 10 wt % Cu-BTTri/PVA membrane was accelerated by 22%, while an opposite effect was observed in the case of aqueous copper(II) chloride. Reduced temperature (20 °C) and the presence of the thiol-blocking reagent N-ethylmaleimide (NEM) impair the NO-forming reaction of Cu-BTTri/PVA with GSNO, with both conditions resulting in a decreased NO yield of 16 ± 1% over 3.5 h. Collectively, these findings suggest that Cu-BTTri/PVA membranes may have therapeutic utility through their ability to generate NO from endogenous substrates. Moreover, this work provides a more comprehensive analysis of the parameters that influence Cu-BTTri efficacy, permitting optimization for potential medical applications.
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Affiliation(s)
- Megan J. Neufeld
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Alec Lutzke
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - W. Matthew Jones
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Melissa M. Reynolds
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
- School of Biomedical Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
- Chemical and Biological Engineering, Colorado State University, Fort Collins, Colorado 80523, United States
- Corresponding Author: . Tel.: + 1 970 491 3775
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7
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Wu W, Perrin-Sarrado C, Ming H, Lartaud I, Maincent P, Hu XM, Sapin-Minet A, Gaucher C. Polymer nanocomposites enhance S-nitrosoglutathione intestinal absorption and promote the formation of releasable nitric oxide stores in rat aorta. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2016; 12:1795-1803. [DOI: 10.1016/j.nano.2016.05.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 04/08/2016] [Accepted: 05/05/2016] [Indexed: 02/02/2023]
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8
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A Nitric Oxide-Releasing Self-Assembled Peptide Amphiphile Nanomatrix for Improving the Biocompatibility of Microporous Hollow Fibers. ASAIO J 2016; 61:589-95. [PMID: 26102178 DOI: 10.1097/mat.0000000000000257] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Oxygenators are critical components of extracorporeal circuits used frequently in cardiopulmonary bypass and intensive care, but platelet activation and induction of a complex inflammatory response are usually observed with their use. To improve the biocompatibility of oxygenators, we developed a nitric oxide (NO)-releasing, self-assembled peptide amphiphile nanomatrix. The nanomatrix formed a homogenous coating over the microporous hollow fibers as demonstrated by scanning electron microscopy. We quantitated platelet adhesion to the artificial fibers by measuring absorbance/area of platelets (Abs/A; nm/m2) using acid phosphatase assay. There was a 17-fold decrease in platelet adhesion to the nanomatrix (Abs/A = 0.125) compared with collagen controls (Abs/A = 2.07; p < 0.05) and a 22-fold decrease compared with uncoated fibers (Abs/A = 2.75; p < 0.05). Importantly, the nanomatrix coating did not impede oxygen transfer in water through coated fiber modules (p > 0.05) in a benchtop test circuit at different flow rates as estimated by change in partial pressure of oxygen in relation to water velocity through fibers. These findings demonstrate the feasibility of coating microporous hollow fibers with a NO-releasing self-assembled amphiphile nanomatrix that may improve the biocompatibility of the hollow fibers without affecting their gas exchange capacity.
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9
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Brisbois EJ, Major TC, Goudie MJ, Bartlett RH, Meyerhoff ME, Handa H. Improved hemocompatibility of silicone rubber extracorporeal tubing via solvent swelling-impregnation of S-nitroso-N-acetylpenicillamine (SNAP) and evaluation in rabbit thrombogenicity model. Acta Biomater 2016; 37:111-9. [PMID: 27095484 PMCID: PMC4870167 DOI: 10.1016/j.actbio.2016.04.025] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 04/01/2016] [Accepted: 04/13/2016] [Indexed: 01/13/2023]
Abstract
UNLABELLED Blood-contacting devices, including extracorporeal circulation (ECC) circuits, can suffer from complications due to platelet activation and thrombus formation. Development of nitric oxide (NO) releasing polymers is one method to improve hemocompatibility, taking advantage of the ability of low levels of NO to prevent platelet activation/adhesion. In this study a novel solvent swelling method is used to load the walls of silicone rubber tubing with the NO donor S-nitroso-N-acetylpenicillamine (SNAP). This SNAP-silicone rubber tubing exhibits an NO flux of ca. 1×10(-10)molcm(-2)min(-1), which mimics the range of NO release from the normal endothelium, which is stable for at least 4h. Images of the tubing before and after swelling, obtained via scanning electron microscopy, demonstrate that this swelling method has little effect on the surface properties of the tubing. The SNAP-loaded silicone rubber and silicone rubber control tubing are used to fabricate ECC circuits that are evaluated in a rabbit model of thrombogenicity. After 4h of blood flow, the SNAP-loaded silicone rubber circuits were able to preserve the blood platelet count at 64% of baseline (vs. 12% for silicone rubber control). A 67% reduction in the degree of thrombus formation within the thrombogenicity chamber was also observed. This study demonstrates the ability to improve the hemocompatibility of existing/commercial silicone rubber tubing via a simple solvent swelling-impregnation technique, which may also be applicable to other silicone-based blood-contacting devices. STATEMENT OF SIGNIFICANCE Localized nitric oxide (NO) release can be achieved from biomedical grade polymers doped with S-nitroso-N-acetylpenicillamine (SNAP). Despite the promising in vitro and in vivo biocompatibility results reported for these NO releasing polymers, many of these materials may face challenges in being translated to clinical applications, especially in the areas of polymer processing and manufacturing. In this study, we report a solvent swelling-impregnation technique to incorporate SNAP into extracorporeal circuit (ECC) tubing. These NO-releasing ECCs were able to attenuate the activation of platelets and maintain their functionality, while significantly reducing the extent of thrombus formation during 4h blood flow in the rabbit model of thrombogenicity.
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Affiliation(s)
| | - Terry C Major
- Department of Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Marcus J Goudie
- Department of Biological Engineering, University of Georgia, Athens, GA, USA
| | | | - Mark E Meyerhoff
- Department of Chemistry, University of Michigan, Ann Arbor, MI, USA
| | - Hitesh Handa
- Department of Biological Engineering, University of Georgia, Athens, GA, USA.
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10
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Seabra AB, Kitice NA, Pelegrino MT, Lancheros CAC, Yamauchi LM, Pinge-Filho P, Yamada-Ogatta SF. Nitric oxide-releasing polymeric nanoparticles against Trypanosoma cruzi. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/1742-6596/617/1/012020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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11
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Time lasting S-nitrosoglutathione polymeric nanoparticles delay cellular protein S-nitrosation. Eur J Pharm Biopharm 2014; 89:1-8. [PMID: 25448077 DOI: 10.1016/j.ejpb.2014.11.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 11/07/2014] [Accepted: 11/09/2014] [Indexed: 11/22/2022]
Abstract
Physiological S-nitrosothiols (RSNO), such as S-nitrosoglutathione (GSNO), can be used as nitric oxide (NO) donor for the treatment of vascular diseases. However, despite a half-life measured in hours, the stability of RSNO, limited by enzymatic and non-enzymatic degradations, is too low for clinical application. So, to provide a long-lasting effect and to deliver appropriate NO concentrations to target tissues, RSNO have to be protected. RSNO encapsulation is an interesting response to overcome degradation and provide protection. However, RSNO such as GSNO raise difficulties for encapsulation due to its hydrophilic nature and the instability of the S-NO bound during the formulation process. To our knowledge, the present study is the first description of the direct encapsulation of GSNO within polymeric nanoparticles (NP). The GSNO-loaded NP (GSNO-NP) formulated by a double emulsion process, presented a mean diameter of 289 ± 7 nm. They were positively charged (+40 mV) due to the methacrylic acid and ethylacrylate polymer (Eudragit® RL) used and encapsulated GSNO with a satisfactory efficiency (i.e. 54% or 40 mM GSNO loaded in the NP). In phosphate buffer (37 °C; pH 7.4), GSNO-NP released 100% of encapsulated GSNO within 3h and remained stable still 6h. However, in contact with smooth muscle cells, maximum protein nitrosation (a marker of NO bioavailability) was delayed from 1h for free GSNO to 18h for GSNO-NP. Therefore, protection and sustained release of NO were achieved by the association of a NO donor with a drug delivery system (such as polymeric NP), providing opportunities for vascular diseases treatment.
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Joslin JM, Lantvit SM, Reynolds MM. Nitric oxide releasing Tygon materials: studies in donor leaching and localized nitric oxide release at a polymer-buffer interface. ACS APPLIED MATERIALS & INTERFACES 2013; 5:9285-94. [PMID: 23957655 DOI: 10.1021/am402112y] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Tygon is a proprietary plasticized poly(vinyl chloride) polymer that is used widely in bioapplications, specifically as extracorporeal circuits. To overcome issues with blood clot formation and infection associated with the failure of these medical devices upon blood contact, we consider a Tygon coating with the ability to release the natural anticlotting and antibiotic agent, nitric oxide (NO), under simulated physiological conditions. These coatings are prepared by incorporating 20 w/w% S-nitrosoglutathione (GSNO) donor into a Tygon matrix. These films release NO on the order of 0.64 ± 0.5 × 10(-10) mol NO cm(-2) min(-1), which mimics the lower end of natural endothelium NO flux. We use a combination of assays to quantify the amount of GSNO that is found intact at different time points throughout the film soak, as well as monitor the total thiol content in the soaking solution due to any analyte that has leached from the polymer film. We find that a burst of GSNO is released from the material surface within 5 min to 1 h of soaking, which only represents 0.25% of the total GSNO contained in the film. After 1 h of film soak, no additional GSNO is detected in the soaking solution. By further considering the total thiol content in solution relative to the intact GSNO, we demonstrate that the amount of GSNO leached from the material into the buffer soaking solution does not contribute significantly to the total NO released from the GSNO-incorporated Tygon film (<10% total NO). Further surface analysis using SEM-EDS traces the elemental S on the material surface, demonstrating that within 5 min -1 h soaking time, 90% of the surface S is removed from the material. Surface wettability and roughness measurements indicate no changes between the GSNO-incorporated films pre- to postsoak that will be significant toward the adsorption of biological components, such as proteins, relative to the presoaked donor-incorporated film. Overall, we demonstrate that, for a 20 w/w% GSNO-incorporated Tygon film, relatively minimal GSNO leaching is experienced, and the lost GSNO is from the material surface. Varying the donor concentration from 5 to 30 w/w% GSNO within the film does not result in significantly different NO release profiles. Additionally, the steady NO flux associated with the system is predominantly due to localized release from the material, and not donor lost to soaking solution. The surface properties of these materials generally imply that they are useful for blood-contacting applications.
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Affiliation(s)
- Jessica M Joslin
- Department of Chemistry and ‡School of Biomedical Engineering, Colorado State University , 1872 Campus Delivery, Fort Collins, Colorado 80523, United States
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13
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de Menezes AMA, de Souza GFP, Gomes AS, de Carvalho Leitão RF, de Albuquerque Ribeiro R, de Oliveira MG, de Castro Brito GA. S-Nitrosoglutathione Decreases Inflammation and Bone Resorption in Experimental Periodontitis in Rats. J Periodontol 2012; 83:514-21. [DOI: 10.1902/jop.2011.110332] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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14
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Hornyák I, Marosi K, Kiss L, Gróf P, Lacza Z. Increased stability of S-nitrosothiol solutions via pH modulations. Free Radic Res 2012; 46:214-25. [PMID: 22149535 DOI: 10.3109/10715762.2011.647692] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
S-nitrosothiol (RSNO) solutions represent a valuable source of nitric oxide and could be used as topical vasodilators, but their fast decomposition rate poses a serious obstacle to their potentially widespread therapeutic use. Our aim was to characterize and quantify the effect of pH on S-nitrosothiol formation and decomposition in simple aqueous solutions of S-nitrosoglutathione (GSNO), S-nitroso-N-acetylcysteine (SNAC) and S-nitroso-3-mercaptopropionic acid (SN3MPA). Furthermore, we investigated the effect of storage pH on the stability of GSNO incorporated in poly(ethylene glycol)/ poly(vinyl alcohol) matrices. S-nitrosothiol concentrations were measured spectrophotometrically and laser Doppler scanning method was used to assess dermal blood flow. GSH and NAC solutions reached a complete transformation to nitrosothiols when synthesized using acidic NaNO(2) solution. The initial concentration of all investigated RSNOs decreased more slowly with pH adjusted to mildly basic values (8.4-8.8) for the storage period. Polymer gels of PVA/PEG compositions at mildly basic storage pH further reduced the decomposition rate succeeding to contain 46.8% of the initial GSNO concentration for 25 days. This amount of topically administered GSNO was still capable of increasing the dermal blood flow over 200% in human subjects.
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Affiliation(s)
- István Hornyák
- Semmelweis University, Department of Human Physiology and Clinical Experimental Research, Budapest, Hungary.
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15
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Sorragi CDL, Shishido SM, Lemos ME, Marcondes S, Antunes E, Krieger MH. In vitro evaluation of the safe margin, antithrombotic and antiproliferative actions for the treatment of restenosis: Nitric oxide donor and polymers. Cell Biochem Funct 2011; 29:207-14. [PMID: 21374644 DOI: 10.1002/cbf.1738] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Revised: 01/18/2011] [Accepted: 01/19/2011] [Indexed: 01/14/2023]
Abstract
Drug-eluting stents (DES) were developed to combat the problem of in-stent restenosis, and evaluating the biological activity from DES systems is critical for its safety and efficacy. To test the cytotoxicity of nitric oxide (NO) donor-containing polymers for their potential use in DES applications, S-nitrosoglutathione (GSNO) or in combination with poly(vinyl alcohol) (PVA) and poly(vinyl pyrrolidone) (PVP) in an aqueous polymeric solution (PVA/PVP/GSNO) was investigated using Balb/c 3T3 and Rabbit arterial smooth muscle (RASM) cells. The sensitivity of 3T3 cells to the cytotoxicity effects induced by GSNO was higher than that of RASM cells, while RASM cells were more susceptible to alterations in membrane permeability. Cell growth assays showed that GSNO and PVA/PVP/GSNO induced antiproliferative effects in RASM cells. Moreover, the presence of polymers can reduce the cytotoxicity and enhance the antiproliferative effects of GSNO. Dose-dependent inhibition of platelet aggregation was similar for both PVA/PVP/GSNO (EC50 of 3.4 ± 2.3 µM) and GSNO (EC50 of 2.8 ± 1.1 µM) solutions. Platelet adhesion assays showed that the inhibition caused by GSNO (EC50 of 5.0 mM) was dependent on the presence of plasma. These results demonstrate that the methodology adopted here is suitable to establish safety margins and evaluate the antithrombotic potential and antiproliferative effects of NO-eluting biomaterials and polymeric solutions for the new cardiovascular devices, and also to emphasize the importance of using more specific cell lines in these evaluations.
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Affiliation(s)
- Cláudia de Lourdes Sorragi
- Laboratory of Cardiovascula, Department of Anatomy, Cellular Biology and Physiology, State University of Campinas, Biology Institute, SP, Brasil
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16
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Coneski PN, Rao KS, Schoenfisch MH. Degradable nitric oxide-releasing biomaterials via post-polymerization functionalization of cross-linked polyesters. Biomacromolecules 2010; 11:3208-15. [PMID: 20954726 PMCID: PMC3070196 DOI: 10.1021/bm1006823] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis of diverse nitric oxide (NO)-releasing network polyesters is described. The melt phase condensation of polyols with a calculated excess of diacid followed by thermal curing generates cross-linked polyesters containing acid end groups. Varying the composition and curing temperatures of the polyesters resulted in materials with tunable thermal and degradation properties. Glass transition temperatures for the synthesized materials range from -25.5 to 3.2 °C, while complete degradation of these polyesters occurs within a minimum of nine weeks under physiological conditions (pH 7.4, 37 °C). Post-polymerization coupling of aminothiols to terminal carboxylic acids generate thiol-containing polyesters, with thermal and degradation characteristics similar to those of the parent polyesters. After nitrosation, these materials are capable of releasing up to 0.81 μmol NO cm(-2) for up to 6 d. The utility of the polyesters as antibacterial biomaterials was indicated by an 80% reduction of Pseudomonas aeruginosa adhesion compared to unmodified controls.
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Affiliation(s)
- Peter N. Coneski
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290
| | - Kavitha S. Rao
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290
| | - Mark H. Schoenfisch
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290
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17
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Seabra AB, Martins D, Simões MMSG, da Silva R, Brocchi M, de Oliveira MG. Antibacterial nitric oxide-releasing polyester for the coating of blood-contacting artificial materials. Artif Organs 2010; 34:E204-14. [PMID: 20497163 DOI: 10.1111/j.1525-1594.2010.00998.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The emergence of multidrug-resistant bacteria associated with blood-contacting artificial materials is a growing health problem, which demands new approaches in the field of biomaterials research. In this study, a poly(sulfhydrylated polyester) (PSPE) was synthesized by the polyesterification reaction of mercaptosuccinic acid with 3-mercapto-1,2-propanediol and blended with poly(methyl methacrylate) (PMMA) from solution, leading to solid PSPE/PMMA films, with three different PSPE : PMMMA mass ratios. These films were subsequently S-nitrosated through the immersion in acidified nitrite solution, yielding poly(nitrosated)polyester/PMMA (PNPE/PMMA) films. A polyurethane intravascular catheter coated with PNPE/PMMA was shown to release nitric oxide (NO) in phosphate buffered saline solution (pH 7.4) at 37 degrees C at rates of 4.6 nmol/cm(2)/h in the first 6 h and 0.8 nmol/cm(2)/h in the next 12 h. When used to coat the bottom of culture plates, NO released from these films exerted a potent dose- and time-dependent antimicrobial activity against Staphylococcus aureus and a multidrug-resistant Pseudomonas aeruginosa strains. This antibacterial effect of PSPE/PMMA films opens a new perspective for the coating of blood-contacting artificial materials, for avoiding their colonization with highly resistant bacteria.
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Affiliation(s)
- Amedea B Seabra
- Institute of Chemistry, University of Campinas, UNICAMP, Campinas SP, Brazil
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18
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Li Y, Lee PI. Controlled Nitric Oxide Delivery Platform Based on S-Nitrosothiol Conjugated Interpolymer Complexes for Diabetic Wound Healing. Mol Pharm 2010; 7:254-66. [DOI: 10.1021/mp900237f] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Yan Li
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario M5S 3M2, Canada
| | - Ping I. Lee
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario M5S 3M2, Canada
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19
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Friedman A, Friedman J. New biomaterials for the sustained release of nitric oxide: past, present and future. Expert Opin Drug Deliv 2009; 6:1113-22. [PMID: 19663720 DOI: 10.1517/17425240903196743] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Nitric oxide (NO), the 1992 'Molecule of the Year', is the focus of immense medical and scientific exploration. Interest in NO has grown exponentially since the initial and relatively recent discovery that NO is the long sought after endothelial relaxing factor. There is intense research that is continuing to expose the extensive physiologic impact of NO in virtually all organ and tissue systems under both normal and pathological conditions. Both the rate of delivery and the amount of site-specific generated NO modulate a balance between cytoregulatory and cytotoxic activities. This balancing act and the very short lifetime of NO under physiological conditions pose an extreme challenge with respect to harnessing the exceptional therapeutic potential of this molecule. Over the past two decades, the race to translate the therapeutic potential of NO to the bedside has been overwhelmingly through the development of numerous NO delivery devices/vehicles. So far no one product has emerged as a clearcut winner. This review: discusses and evaluates NO-donating platforms that are available at present; attempts to enhance delivery and efficacy through encapsulation in silane-based hydrogel matrices; and discusses and evaluates the future direction of these advances.
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Affiliation(s)
- Adam Friedman
- Department of Medicine, Albert Einstein of Medicine, Bronx, NY 10467, USA.
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20
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Riccio DA, Dobmeier KP, Hetrick EM, Privett BJ, Paul HS, Schoenfisch MH. Nitric oxide-releasing S-nitrosothiol-modified xerogels. Biomaterials 2009; 30:4494-502. [PMID: 19501904 PMCID: PMC2743564 DOI: 10.1016/j.biomaterials.2009.05.006] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2009] [Accepted: 05/10/2009] [Indexed: 11/21/2022]
Abstract
The synthesis, material characterization, and in vitro biocompatibility of S-nitrosothiol (RSNO)-modified xerogels are described. Thiol-functionalized xerogel films were formed by hydrolysis and co-condensation of 3-mercaptopropyltrimethoxysilane (MPTMS) and methyltrimethoxysilane (MTMOS) sol-gel precursors at varying concentrations. Subsequent thiol nitrosation via acidified nitrite produced RSNO-modified xerogels capable of generating nitric oxide (NO) for up to 2 weeks under physiological conditions. Xerogels also exhibited NO generation upon irradiation with broad-spectrum light or exposure to copper, with NO fluxes proportional to wattage and concentration, respectively. Xerogels were capable of storing up to approximately 1.31 micromol NO mg(-1), and displayed negligible fragmentation over a 2-week period. Platelet and bacterial adhesion to nitrosated films was reduced compared to non-nitrosated controls, confirming the antithrombotic and antibacterial properties of the NO-releasing materials. Fibroblast cell viability was maintained on the xerogel surfaces illustrating the promise of RSNO-modified xerogels as biomedical device coatings.
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Affiliation(s)
| | | | - Evan M. Hetrick
- Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Benjamin J. Privett
- Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Heather S. Paul
- Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Mark H. Schoenfisch
- Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599, USA
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21
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Wu Y, Meyerhoff ME. Nitric oxide-releasing/generating polymers for the development of implantable chemical sensors with enhanced biocompatibility. Talanta 2008; 75:642-50. [PMID: 18585126 PMCID: PMC2442581 DOI: 10.1016/j.talanta.2007.06.022] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2007] [Accepted: 06/13/2007] [Indexed: 11/19/2022]
Abstract
The development of reliable in vivo chemical sensors for real-time clinical monitoring of blood gases, electrolytes, glucose, etc. in critically ill and diabetic patients remains a great challenge owing to inherent biocompatibility problems that can cause errant analytical results upon sensor implantation (e.g., cell adhesion, thrombosis, inflammation). Nitric oxide (NO) is a well-known inhibitor of platelet activation and adhesion, and also a potent inhibitor of smooth muscle cell proliferation. In addition, NO mediates inflammatory response and promotes angiogenesis. Polymers that release or generate NO at their surfaces have been shown to exhibit greatly enhanced thromboresistance in vivo when in contact with flowing blood, as well as reduce inflammatory response when placed subcutaneously, and thus have the potential to improve the biocompatibility of implanted chemical sensors. Locally elevated NO levels at the surface of implanted devices can be achieved by using polymers that incorporate NO donor species that can decompose and release NO spontaneously when in contact with physiological fluids, or NO-generating polymers that possess an immobilized catalyst that decompose endogenous S-nitrosothiols to generate NO in situ. The potential use of such NO-releasing/generating materials for preparing in vivo sensors implanted either intravascularly or subcutaneously, is examined in this review.
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Affiliation(s)
- Yiduo Wu
- Department of Chemistry, The University of Michigan, Ann Arbor, MI 48109-1055, USA
| | - Mark E. Meyerhoff
- Department of Chemistry, The University of Michigan, Ann Arbor, MI 48109-1055, USA
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Seabra AB, da Silva R, de Souza GFP, de Oliveira MG. Antithrombogenic polynitrosated polyester/poly(methyl methacrylate) blend for the coating of blood-contacting surfaces. Artif Organs 2008; 32:262-7. [PMID: 18370938 DOI: 10.1111/j.1525-1594.2008.00540.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A nitric oxide (NO) donor polyester containing multiple S-nitrosothiol (S-NO) groups covalently attached to the polymer backbone was synthesized through the esterification of poly(ethylene glycol) with mercaptosuccinic acid, followed by the nitrosation of the -SH moieties. The polynitrosated polyester (PNPE) obtained was blended with poly(methyl methacrylate) (PMMA), yielding solid films capable of releasing NO. Scanning electron microscopy analysis showed that acrylic plates and stainless steel intracoronary stents can be coated with continuous and adherent PNPE/PMMA films. After an initial NO burst, these films release NO spontaneously in dry condition or immersed in aqueous solution at constant rates of 1.8 and 180 nmol/g/h, respectively, for more than 24 h at physiological temperature. PNPE/PMMA coated surfaces were shown to inhibit platelet adhesion when in contact with whole blood. These results show that PNPE/PMMA blend can be used for the coating of blood-contacting surfaces, with potential to inhibit thrombosis and restenosis after stenting.
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Affiliation(s)
- Amedea B Seabra
- Chemistry Institute, State University of Campinas, UNICAMP, Campinas, São Paulo, Brazil
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23
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Biodegradability, antimicrobial activity and properties of PVA/PVP hydrogels prepared by γ-irradiation. JOURNAL OF POLYMER RESEARCH 2008. [DOI: 10.1007/s10965-008-9196-0] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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24
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Şanlı O, Orhan E, Asman G. Release of salicylic acid through poly(vinyl alcohol)/poly(vinyl pyrrolidone) and poly(vinyl alcohol-g-N-vinyl-2-pyrrolidone) membranes. J Appl Polym Sci 2006. [DOI: 10.1002/app.24453] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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25
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Seabra AB, da Silva R, de Oliveira MG. Polynitrosated Polyesters: Preparation, Characterization, and Potential Use for Topical Nitric Oxide Release. Biomacromolecules 2005; 6:2512-20. [PMID: 16153087 DOI: 10.1021/bm050216z] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
New nitric oxide (NO) donor macromolecules, containing multiple S-nitrosothiol (S-NO) groups covalently attached to the polymer backbone, were prepared through the polycondensation reaction of diols (ethylene glycol and poly(ethylene glycol)) with mercaptosuccinic acid, followed by the S-nitrosation of the SH groups by a gaseous NO/O2 mixture. The polynitrosated polyesters (PNPEs) obtained were characterized by IR spectroscopy and gel permeation chromatography and displayed biological activity as vasodilators, leading to local hyperaemia when applied topically on healthy skin. Kinetic measurements in either dry or aqueous conditions have shown that PNPEs can provide sustained NO release for more than 20 h at physiological temperature. Their increased viscosity at low temperatures greatly reduces the rate of NO release, allowing for their storage for more than 90 days at -20 degrees C without decomposition. These results indicate that PNPEs have potential for topical delivery of NO in biomedical applications.
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Affiliation(s)
- Amedea B Seabra
- Instituto de Química, Universidade Estadual de Campinas, UNICAMP, CP 6154, CEP 13083-970 Campinas, SP, Brazil
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