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Hennebelle M, Villeneuve P, Durand E, Lecomte J, van Duynhoven J, Meynier A, Yesiltas B, Jacobsen C, Berton-Carabin C. Lipid oxidation in emulsions: New insights from the past two decades. Prog Lipid Res 2024; 94:101275. [PMID: 38280491 DOI: 10.1016/j.plipres.2024.101275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 01/19/2024] [Accepted: 01/22/2024] [Indexed: 01/29/2024]
Abstract
Lipid oxidation constitutes the main source of degradation of lipid-rich foods, including food emulsions. The complexity of the reactions at play combined with the increased demand from consumers for less processed and more natural foods result in additional challenges in controlling this phenomenon. This review provides an overview of the insights acquired over the past two decades on the understanding of lipid oxidation in oil-in-water (O/W) emulsions. After introducing the general structure of O/W emulsions and the classical mechanisms of lipid oxidation, the contribution of less studied oxidation products and the spatiotemporal resolution of these reactions will be discussed. We then highlight the impact of emulsion formulation on the mechanisms, taking into consideration the new trends in terms of emulsifiers as well as their own sensitivity to oxidation. Finally, novel antioxidant strategies that have emerged to meet the recent consumer's demand will be detailed. In an era defined by the pursuit of healthier, more natural, and sustainable food choices, a comprehensive understanding of lipid oxidation in emulsions is not only an academic quest, but also a crucial step towards meeting the evolving expectations of consumers and ensuring the quality and stability of lipid-rich food products.
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Affiliation(s)
- Marie Hennebelle
- Laboratory of Food Chemistry, Department of Agrotechnology and Food Sciences, Wageningen University, Wageningen, Netherlands.
| | - Pierre Villeneuve
- CIRAD, UMR Qualisud, Montpellier F34398, France; Qualisud, Univ Montpellier, Avignon Université, CIRAD, Institut Agro, IRD, Université de La Réunion, Montpellier, France
| | - Erwann Durand
- CIRAD, UMR Qualisud, Montpellier F34398, France; Qualisud, Univ Montpellier, Avignon Université, CIRAD, Institut Agro, IRD, Université de La Réunion, Montpellier, France
| | - Jérôme Lecomte
- CIRAD, UMR Qualisud, Montpellier F34398, France; Qualisud, Univ Montpellier, Avignon Université, CIRAD, Institut Agro, IRD, Université de La Réunion, Montpellier, France
| | - John van Duynhoven
- Laboratory of Biophysics, Wageningen University & Research, Wageningen, the Netherlands; Unilever Food Innovation Centre, Wageningen, the Netherlands
| | | | - Betül Yesiltas
- Research group for Bioactives - Analysis and Application, Technical University of Denmark, National Food Institute, Kgs. Lyngby DK-2800, Denmark
| | - Charlotte Jacobsen
- Research group for Bioactives - Analysis and Application, Technical University of Denmark, National Food Institute, Kgs. Lyngby DK-2800, Denmark
| | - Claire Berton-Carabin
- INRAE, UR BIA, Nantes 44300, France; Laboratory of Food Process Engineering, Department of Agrotechnology and Food Sciences, Wageningen University, Wageningen, Netherlands
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2
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Meleties M, Cooper BM, Marcano-James D, Bhalla AS, Shameem M. Vaporized Hydrogen Peroxide Sterilization in the Production of Protein Therapeutics: Uptake and Effects on Product Quality. J Pharm Sci 2023; 112:2991-3004. [PMID: 37751805 DOI: 10.1016/j.xphs.2023.09.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 09/14/2023] [Accepted: 09/15/2023] [Indexed: 09/28/2023]
Abstract
The aseptic filling of drug products is carried out in pharmaceutical isolators that have been sterilized. A commonly used method for achieving a high level of sterility assurance is vaporized hydrogen peroxide (VHP) sterilization, which is favorable to other methods, such as ethylene oxide sterilization, due to its low cycle times and nontoxic residuals. While VHP cycles are often employed to create a sterile environment within an isolator, they can leave residual levels of hydrogen peroxide behind that can enter the product during fill-finish operations. Due to the oxidizing potential of hydrogen peroxide and the multiple possible sources of uptake along filling lines, the extent of the potential impact on product quality needs to be understood during pharmaceutical development. Herein, different factors affecting hydrogen peroxide uptake, points of entry along the filling line, and possible impacts on product quality are reviewed.
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Affiliation(s)
- Michael Meleties
- Formulations Development, Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY, 10591 USA.
| | - Bailey M Cooper
- Formulations Development, Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY, 10591 USA
| | - Daniela Marcano-James
- Formulations Development, Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY, 10591 USA
| | - Amardeep S Bhalla
- Formulations Development, Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY, 10591 USA
| | - Mohammed Shameem
- Formulations Development, Regeneron Pharmaceuticals, Inc., 777 Old Saw Mill River Road, Tarrytown, NY, 10591 USA
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Boahen A, Chew SY, Neela VK, Than LTL. Limosilactobacillus reuteri 29A Cell-Free Supernatant Antibiofilm and Antagonistic Effects in Murine Model of Vulvovaginal Candidiasis. Probiotics Antimicrob Proteins 2023; 15:1681-1699. [PMID: 36881331 DOI: 10.1007/s12602-023-10050-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/10/2023] [Indexed: 03/08/2023]
Abstract
Vaginal dysbiosis advocates burgeoning of devious human vaginal pathobionts like Candida species that possess multiple virulence properties and metabolic flexibility to cause infections. Inevitably, antifungal resistance may emerge due to their innate nature (e.g., biofilm formation), which assists in their virulence as well as the formation of persister cells after dispersal. In consequence, the phenomenon of biofilm involvement in vulvovaginal candidiasis (VVC) and its recurrence is becoming paramount. Lactic acid bacteria and their derivatives have proven to be hostile to Candida species. Here, we throw more light on the potency of the derivatives, i.e., cell-free supernatant (CFS) produced by an indigenously isolated vaginal Lactobacillus strain, Limosilactobacillus reuteri 29A. In the present study, we investigated the antibiofilm and antagonistic effects of L. reuteri 29A CFS, against biofilms of Candida species and in murine model of vulvovaginal candidiasis. In our in vitro biofilm study, the CFS disrupted and inhibited preformed biofilms of C. albicans and C. glabrata. Scanning electron microscopy displayed the destruction of preformed biofilms and impediment of C. albicans morphogenesis by the CFS. Gas chromatography-mass spectrometry analysis showed multiple key compounds that may act singly or synergistically. In vivo, the CFS showed no collateral damage to uninfected mice; the integrity of infected vaginal tissues was restored by the administration of the CFS as seen from the cytological, histopathological, and electron microscopical analyses. The results of this study document the potential use of CFS as an adjuvant or prophylactic option in addressing vaginal fungal infections.
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Affiliation(s)
- Angela Boahen
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, 43400 UPM, Malaysia
| | - Shu Yih Chew
- Department of Microbiology and Immunology, Pathology Division, School of Medicine, International Medical University, Kuala Lumpur, Selangor, 57000, Malaysia
| | - Vasantha Kumari Neela
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, 43400 UPM, Malaysia
| | - Leslie Thian Lung Than
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, 43400 UPM, Malaysia.
- Laboratory of Vaccine and Biomolecules, Institute of Bioscience, Universiti Putra Malaysia, Serdang, Selangor, 43400, Malaysia.
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Preston KB, Wong TAS, Lieberman MM, To A, Lai CY, Granados A, Thomasson H, Misamore J, Yalley-Ogunro J, Cabus M, Andersen H, Donini O, Lehrer AT, Randolph TW. Lyophilized Filovirus Glycoprotein Vaccines: Peroxides in a Vaccine Formulation with Polysorbate 80-Containing Adjuvant are Associated with Reduced Neutralizing Antibody Titers in Both Mice and Non-Human Primates. J Pharm Sci 2022; 111:3424-3434. [PMID: 35609629 DOI: 10.1016/j.xphs.2022.05.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 05/18/2022] [Accepted: 05/18/2022] [Indexed: 01/05/2023]
Abstract
Zaire ebolavirus, Sudan ebolavirus, and Marburg marburgvirus are the filoviruses most commonly associated with human disease. Previously, we administered a three-dose regimen of trivalent vaccines comprising glycoprotein antigens from each virus in mice and non-human primates (NHPs). The vaccines, which contained a polysorbate 80-stabilized squalane-in-water emulsion adjuvant and were lyophilized from a solution containing trehalose, produced high antibody levels against all three filovirus antigens. Subsequently, single-vial formulations containing a higher concentration of adjuvant were generated for testing in NHPs, but these vaccines elicited lower neutralizing antibody titers in NHPs than previously tested formulations. In order to explain these results, in the current work we measured the size of adjuvant emulsion droplets and the peroxide levels present in the vaccines after lyophilization and reconstitution and tested the effects of these variables on the immune response in mice. Increases in squalane droplet sizes were observed when the ratio of adjuvant to trehalose was increased beyond a critical value, but antibody and neutralizing antibody titers in mice were independent of the droplet size. Higher levels of peroxides in the vaccines correlated with higher concentrations of adjuvant in the formulations, and higher peroxide levels were associated with increased levels of oxidative damage to glycoprotein antigens. Neutralizing titers in mice were inversely correlated with peroxide levels in the vaccines, but peroxide levels could be reduced by adding free methionine, resulting in retention of high neutralizing antibody titers. Overall, the results suggest that oxidation of glycoprotein antigens by peroxides in the polysorbate 80-stabilized squalane-in-water emulsion adjuvant, but not lyophilization-induced increases in adjuvant emulsion droplet size may have been responsible for the decreased neutralizing titers seen in formulations containing higher amounts of adjuvant.
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Affiliation(s)
- Kendall B Preston
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO 80303, United States
| | - Teri Ann S Wong
- Department of Tropical Medicine, Medical Microbiology & Pharmacology, John A. Burns School of Medicine, University of Hawai'i at Manoa, Honolulu, HI 96813, United States
| | - Michael M Lieberman
- Department of Tropical Medicine, Medical Microbiology & Pharmacology, John A. Burns School of Medicine, University of Hawai'i at Manoa, Honolulu, HI 96813, United States
| | - Albert To
- Department of Tropical Medicine, Medical Microbiology & Pharmacology, John A. Burns School of Medicine, University of Hawai'i at Manoa, Honolulu, HI 96813, United States
| | - Chih-Yun Lai
- Department of Tropical Medicine, Medical Microbiology & Pharmacology, John A. Burns School of Medicine, University of Hawai'i at Manoa, Honolulu, HI 96813, United States
| | | | | | | | | | - Mehtap Cabus
- BIOQUAL, Inc., Rockville, MD 20850, United States
| | | | | | - Axel T Lehrer
- Department of Tropical Medicine, Medical Microbiology & Pharmacology, John A. Burns School of Medicine, University of Hawai'i at Manoa, Honolulu, HI 96813, United States
| | - Theodore W Randolph
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO 80303, United States.
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Martin JR, Howard MT, Wang S, Berger AG, Hammond PT. Oxidation-Responsive, Tunable Growth Factor Delivery from Polyelectrolyte-Coated Implants. Adv Healthc Mater 2021; 10:e2001941. [PMID: 33738985 DOI: 10.1002/adhm.202001941] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 03/04/2021] [Indexed: 12/27/2022]
Abstract
Polyelectrolyte multilayer (PEM) coatings, constructed on the surfaces of tissue engineering scaffolds using layer-by-layer assembly (LbL), promote sustained release of therapeutic molecules and have enabled regeneration of large-scale, pre-clinical bone defects. However, these systems primarily rely on non-specific hydrolysis of PEM components to foster drug release, and their pre-determined drug delivery schedules potentially limit future translation into innately heterogeneous patient populations. To trigger therapeutic delivery directly in response to local environmental stimuli, an LbL-compatible polycation solely degraded by cell-generated reactive oxygen species (ROS) was synthesized. These thioketal-based polymers were selectively cleaved by physiologic doses of ROS, stably incorporated into PEM films alongside growth factors, and facilitated tunable release of therapeutic bone morphogenetic protein-2 (BMP-2) upon oxidation. These coatings' sensitivity to oxidation was also dependent on the polyanions used in film construction, providing a simple method for enhancing ROS-mediated protein delivery in vitro. Correspondingly, when implanted in critically-sized rat calvarial defects, the most sensitive ROS-responsive coatings generated a 50% increase in bone regeneration compared with less sensitive formulations and demonstrated a nearly threefold extension in BMP-2 delivery half-life over conventional hydrolytically-sensitive coatings. These combined results highlight the potential of environmentally-responsive PEM coatings as tunable drug delivery systems for regenerative medicine.
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Affiliation(s)
- John R. Martin
- Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology Cambridge MA 02139 USA
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - MayLin T. Howard
- Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology Cambridge MA 02139 USA
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Sheryl Wang
- Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology Cambridge MA 02139 USA
- Department of Biological Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Adam G. Berger
- Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology Cambridge MA 02139 USA
- Division of Health Sciences and Technology Massachusetts Institute of Technology Cambridge MA 02139 USA
| | - Paula T. Hammond
- Koch Institute for Integrative Cancer Research Massachusetts Institute of Technology Cambridge MA 02139 USA
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA
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Parenky AC, Wadhwa S, Chen HH, Bhalla AS, Graham KS, Shameem M. Container Closure and Delivery Considerations for Intravitreal Drug Administration. AAPS PharmSciTech 2021; 22:100. [PMID: 33709236 PMCID: PMC7952281 DOI: 10.1208/s12249-021-01949-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 01/30/2021] [Indexed: 11/30/2022] Open
Abstract
Intravitreal (IVT) administration of therapeutics is the standard of care for treatment of back-of-eye disorders. Although a common procedure performed by retinal specialists, IVT administration is associated with unique challenges related to drug product, device and the procedure, which may result in adverse events. Container closure configuration plays a crucial role in maintaining product stability, safety, and efficacy for the intended shelf-life. Careful design of primary container configuration is also important to accurately deliver small volumes (10-100 μL). Over- or under-dosing may lead to undesired adverse events or lack of efficacy resulting in unpredictable and variable clinical responses. IVT drug products have been traditionally presented in glass vials. However, pre-filled syringes offer a more convenient administration option by reducing the number of steps required for dose preparation there by potentially reducing the time demand on the healthcare providers. In addition to primary container selection, product development studies should focus on, among other things, primary container component characterization, material compatibility with the formulation, formulation stability, fill volume determination, extractables/leachables, and terminal sterilization. Ancillary components such as disposable syringes and needles must be carefully selected, and a detailed administration procedure that includes dosing instructions is required to ensure successful administration of the product. Despite significant efforts in improving the drug product and administration procedures, ocular safety concerns such as endophthalmitis, increased intraocular pressure, and presence of silicone floaters have been reported. A systematic review of available literature on container closure and devices for IVT administration can help guide successful product development.
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Wang Z, Jian Y, Han Y, Fu Z, Lu D, Wu J, Liu Z. Recent progress in enzymatic functionalization of carbon-hydrogen bonds for the green synthesis of chemicals. Chin J Chem Eng 2020. [DOI: 10.1016/j.cjche.2020.06.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Enhancement of hydrogen peroxide tolerance of lipase LipA from Bacillus subtilis using semi-rational design. Biochem Eng J 2020. [DOI: 10.1016/j.bej.2020.107590] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Yabuta K, Futamura H, Kawasaki K, Sugiyama H. Impact of H 2O 2 Sorption by Polymers on the Duration of Aeration in Pharmaceutical Decontamination. J Pharm Sci 2020; 109:2767-2773. [PMID: 32504629 DOI: 10.1016/j.xphs.2020.05.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 05/19/2020] [Accepted: 05/19/2020] [Indexed: 10/24/2022]
Abstract
As part of manufacturing a sterile drug product, we quantified the impact of H2O2 sorption by polymers on the duration of aeration in pharmaceutical decontamination. Five polymers, which are typically used as materials/parts in sterile isolators, were investigated: polyethylene, polyvinyl chloride, Silicone, polyoxymethylene (POM), and chlorosulfonated polyethylene. Experiments were performed to estimate the storage capacity and diffusion coefficients of H2O2 in the polymer. Considering these key properties of sorption/desorption, mathematical models were developed to simulate the duration of aeration to achieve the target H2O2 concentration, which is the indicator to minimize. The models were used to create a map-out of the duration given the properties of the polymers, including the five polymers. In the simulated setup, POM and Silicone were found to require prolonged aeration. Thus, when using these polymers in the isolator, the size/amount should be carefully investigated. Another practical finding was that the superiority of the polymers changed depending on the target H2O2 concentration. This result motivates an early incorporation of the product information in the isolator design, to achieve a rapid decontamination/aeration cycle.
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Affiliation(s)
- Keisho Yabuta
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Haruka Futamura
- Airex Co., Ltd., 14-31 Tsubaki-cho, Nakamura-ku, Nagoya-shi, Aichi 453-0015, Japan
| | - Koji Kawasaki
- Airex Co., Ltd., 14-31 Tsubaki-cho, Nakamura-ku, Nagoya-shi, Aichi 453-0015, Japan
| | - Hirokazu Sugiyama
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
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The Diffusion of Hydrogen Peroxide Into the Liquid Product During Filling Operations Inside Vaporous Hydrogen Peroxide–Sterilized Isolators Can Be Predicted by a Mechanistic Model. J Pharm Sci 2019; 108:2527-2533. [DOI: 10.1016/j.xphs.2019.03.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 03/06/2019] [Accepted: 03/29/2019] [Indexed: 11/20/2022]
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Wang W, Ohtake S. Science and art of protein formulation development. Int J Pharm 2019; 568:118505. [PMID: 31306712 DOI: 10.1016/j.ijpharm.2019.118505] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Revised: 07/08/2019] [Accepted: 07/08/2019] [Indexed: 02/07/2023]
Abstract
Protein pharmaceuticals have become a significant class of marketed drug products and are expected to grow steadily over the next decade. Development of a commercial protein product is, however, a rather complex process. A critical step in this process is formulation development, enabling the final product configuration. A number of challenges still exist in the formulation development process. This review is intended to discuss these challenges, to illustrate the basic formulation development processes, and to compare the options and strategies in practical formulation development.
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Affiliation(s)
- Wei Wang
- Biological Development, Bayer USA, LLC, 800 Dwight Way, Berkeley, CA 94710, United States.
| | - Satoshi Ohtake
- Pharmaceutical Research and Development, Pfizer Biotherapeutics Pharmaceutical Sciences, Chesterfield, MO 63017, United States
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Effect of Peroxide- Versus Alkoxyl-Induced Chemical Oxidation on the Structure, Stability, Aggregation, and Function of a Therapeutic Monoclonal Antibody. J Pharm Sci 2018; 107:2789-2803. [DOI: 10.1016/j.xphs.2018.07.024] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 06/25/2018] [Accepted: 07/24/2018] [Indexed: 11/22/2022]
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Effect of Chemical Oxidation on the Higher Order Structure, Stability, Aggregation, and Biological Function of Interferon Alpha-2a: Role of Local Structural Changes Detected by 2D NMR. Pharm Res 2018; 35:232. [PMID: 30324266 DOI: 10.1007/s11095-018-2518-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Accepted: 10/03/2018] [Indexed: 12/12/2022]
Abstract
PURPOSE Oxidized interferons have been shown to aggregate and cause immunogenicity. In this study, the structural mechanisms underlying oxidation-induced interferon alpha-2a (IFNA2a) aggregation and loss of function were examined. METHODS IFNA2a was oxidized using 0.037% vol/vol hydrogen peroxide. Oxidized protein was probed using biophysical methods that include denaturant melts, particle counting, proteolysis-coupled mass spectrometry, and 2D NMR. RESULTS Oxidized IFNA2a did not show major changes in its secondary structure, but showed minor changes in tertiary structure when compared to the unoxidized protein. In addition, a significant loss of conformational stability was observed upon oxidation. Correspondingly, increased protein aggregation was observed resulting in the formation of sub-visible particles. Oxidized protein showed decreased biological function in terms of its anti-viral potency and cytopathic inhibition efficacy. Proteolysis-coupled mass spectrometry identified five methionine residues that were oxidized with no correlation between the extent of oxidation and their accessible surface area. 2D 15N-1H HSQC NMR identified residue-level local structural changes in the protein upon oxidation, which were not detectable by global probes such as far-UV circular dichroism and fluorescence. CONCLUSIONS Increased protein aggregation and decreased function of IFNA2a upon oxidation correlated with the site of modification identified by proteolysis-coupled mass spectrometry and local structural changes in the protein detected by 2D NMR.
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14
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Wang W, Roberts CJ. Protein aggregation – Mechanisms, detection, and control. Int J Pharm 2018; 550:251-268. [DOI: 10.1016/j.ijpharm.2018.08.043] [Citation(s) in RCA: 100] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 08/18/2018] [Accepted: 08/20/2018] [Indexed: 12/19/2022]
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