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Cui Y, Cui P, Chen B, Li S, Guan H. Monoclonal antibodies: formulations of marketed products and recent advances in novel delivery system. Drug Dev Ind Pharm 2017; 43:519-530. [DOI: 10.1080/03639045.2017.1278768] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Yanan Cui
- School of Pharmacy, Jining Medicinal College, Jining, China
| | - Ping Cui
- Department of Epidemiology and Biostatistics, Key Laboratory of Cancer Prevention and Therapy, Tianjin, National Clinical Research Centre of Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - Binlong Chen
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Suxin Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
- Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery Systems, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Hua Guan
- School of Pharmacy, Jining Medicinal College, Jining, China
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52
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Taylor MJ, Tomlins P, Sahota TS. Thermoresponsive Gels. Gels 2017; 3:E4. [PMID: 30920501 PMCID: PMC6318636 DOI: 10.3390/gels3010004] [Citation(s) in RCA: 100] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 12/14/2016] [Accepted: 12/16/2016] [Indexed: 01/08/2023] Open
Abstract
Thermoresponsive gelling materials constructed from natural and synthetic polymers can be used to provide triggered action and therefore customised products such as drug delivery and regenerative medicine types as well as for other industries. Some materials give Arrhenius-type viscosity changes based on coil to globule transitions. Others produce more counterintuitive responses to temperature change because of agglomeration induced by enthalpic or entropic drivers. Extensive covalent crosslinking superimposes complexity of response and the upper and lower critical solution temperatures can translate to critical volume temperatures for these swellable but insoluble gels. Their structure and volume response confer advantages for actuation though they lack robustness. Dynamic covalent bonding has created an intermediate category where shape moulding and self-healing variants are useful for several platforms. Developing synthesis methodology-for example, Reversible Addition Fragmentation chain Transfer (RAFT) and Atomic Transfer Radical Polymerisation (ATRP)-provides an almost infinite range of materials that can be used for many of these gelling systems. For those that self-assemble into micelle systems that can gel, the upper and lower critical solution temperatures (UCST and LCST) are analogous to those for simpler dispersible polymers. However, the tuned hydrophobic-hydrophilic balance plus the introduction of additional pH-sensitivity and, for instance, thermochromic response, open the potential for coupled mechanisms to create complex drug targeting effects at the cellular level.
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Affiliation(s)
- M Joan Taylor
- INsmart group, School of Pharmacy Faculty of Health & Life Sciences, De Montfort University, Leicester, LE1 9BH, UK.
| | - Paul Tomlins
- INsmart group, School of Pharmacy Faculty of Health & Life Sciences, De Montfort University, Leicester, LE1 9BH, UK.
| | - Tarsem S Sahota
- INsmart group, School of Pharmacy Faculty of Health & Life Sciences, De Montfort University, Leicester, LE1 9BH, UK.
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53
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Snell JR, Zhou C, Carpenter JF, Randolph TW. Particle Formation and Aggregation of a Therapeutic Protein in Nanobubble Suspensions. J Pharm Sci 2016; 105:3057-3063. [PMID: 27488901 DOI: 10.1016/j.xphs.2016.06.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 06/08/2016] [Accepted: 06/17/2016] [Indexed: 10/21/2022]
Abstract
The generation of nanobubbles following reconstitution of lyophilized trehalose formulations has recently been reported. Here, we characterize particle formation and aggregation of recombinant human interleukin-1 receptor antagonist (rhIL-1ra) in reconstituted formulations of lyophilized trehalose. Particle characterization methods including resonant mass measurement and nanoparticle tracking analysis were used to count and size particles generated upon reconstitution of lyophilized trehalose formulations. In addition, accelerated degradation studies were conducted to monitor rhIL-1ra aggregation in solutions containing various concentrations of suspended nanobubbles. Reconstitution of lyophilized trehalose formulations with solutions containing rhIL-1ra reduced nanobubble concentrations and generated negatively buoyant particles attributed to aggregated rhIL-1ra. Furthermore, levels of rhIL-1ra aggregation following incubation in aqueous solution correlated with concentrations of suspended nanobubbles. The results of this study suggest that nanobubbles may be a contributor to protein aggregation and particle formation in reconstituted, lyophilized therapeutic protein formulations.
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Affiliation(s)
- Jared R Snell
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309
| | - Chen Zhou
- Department of Pharmaceutical Science, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - John F Carpenter
- Department of Pharmaceutical Science, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - Theodore W Randolph
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309.
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54
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Mehta SB, Carpenter JF, Randolph TW. Colloidal Instability Fosters Agglomeration of Subvisible Particles Created by Rupture of Gels of a Monoclonal Antibody Formed at Silicone Oil-Water Interfaces. J Pharm Sci 2016; 105:2338-48. [PMID: 27422087 DOI: 10.1016/j.xphs.2016.06.010] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 06/07/2016] [Accepted: 06/10/2016] [Indexed: 10/21/2022]
Abstract
In this study, we investigated the effect of ionic strength (1.25-231 mM) on viscoelastic interfacial gels formed by a monoclonal antibody at silicone oil-water interfaces, and the formation of subvisible particles due to rupture of these gels. Rates of gel formation and their elastic moduli did not vary significantly with ionic strength. Likewise, during gel rupture no significant effects of ionic strength were observed on particle formation and aggregation as detected by microflow imaging, resonance mass measurement, and size exclusion chromatography. Subvisible particles formed by mechanical rupturing of the gels agglomerated over time, even during quiescent incubation, due to the colloidal instability of the particles.
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Affiliation(s)
- Shyam B Mehta
- Center for Pharmaceutical Biotechnology, Department of Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - John F Carpenter
- Center for Pharmaceutical Biotechnology, Department of Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - Theodore W Randolph
- Center for Pharmaceutical Biotechnology, Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309.
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55
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Aggregation and Particle Formation of Therapeutic Proteins in Contact With a Novel Fluoropolymer Surface Versus Siliconized Surfaces: Effects of Agitation in Vials and in Prefilled Syringes. J Pharm Sci 2016; 105:2053-65. [DOI: 10.1016/j.xphs.2016.04.015] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 04/07/2016] [Accepted: 04/13/2016] [Indexed: 12/18/2022]
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56
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Ghazvini S, Kalonia C, Volkin DB, Dhar P. Evaluating the Role of the Air-Solution Interface on the Mechanism of Subvisible Particle Formation Caused by Mechanical Agitation for an IgG1 mAb. J Pharm Sci 2016; 105:1643-1656. [DOI: 10.1016/j.xphs.2016.02.027] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Revised: 02/04/2016] [Accepted: 02/24/2016] [Indexed: 01/10/2023]
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57
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Raut AS, Kalonia DS. Effect of Excipients on Liquid-Liquid Phase Separation and Aggregation in Dual Variable Domain Immunoglobulin Protein Solutions. Mol Pharm 2016; 13:774-83. [PMID: 26756795 DOI: 10.1021/acs.molpharmaceut.5b00668] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Liquid-liquid phase separation (LLPS) and aggregation can reduce the physical stability of therapeutic protein formulations. On undergoing LLPS, the protein-rich phase can promote aggregation during storage due to high concentration of the protein. Effect of different excipients on aggregation in protein solution is well documented; however data on the effect of excipients on LLPS is scarce in the literature. In this study, the effect of four excipients (PEG 400, Tween 80, sucrose, and hydroxypropyl beta-cyclodextrin (HPβCD)) on liquid-liquid phase separation and aggregation in a dual variable domain immunoglobulin protein solution was investigated. Sucrose suppressed both LLPS and aggregation, Tween 80 had no effect on either, and PEG 400 increased LLPS and aggregation. Attractive protein-protein interactions and liquid-liquid phase separation decreased with increasing concentration of HPβCD, indicating its specific binding to the protein. However, HPβCD had no effect on the formation of soluble aggregates and fragments in this study. LLPS and aggregation are highly temperature dependent; at low temperature protein exhibits LLPS, at high temperature protein exhibits aggregation, and at an intermediate temperature both phenomena occur simultaneously depending on the solution conditions.
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Affiliation(s)
- Ashlesha S Raut
- Department of Pharmaceutical Sciences, University of Connecticut , 69 North Eagleville Road, Unit 3092, Storrs, Connecticut 06269, United States
| | - Devendra S Kalonia
- Department of Pharmaceutical Sciences, University of Connecticut , 69 North Eagleville Road, Unit 3092, Storrs, Connecticut 06269, United States
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58
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Saha S, Shekhawat R, Deep S. Modulations in the self-assembly of bovine serum albumin by enhanced depolymerisation and condensation induced upon stirring. RSC Adv 2016. [DOI: 10.1039/c6ra20243h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An unusual phenomenon in the aggregation profile of BSA in the presence of CTAB, brought about by stirring, is reported here.
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Affiliation(s)
- Shivnetra Saha
- Department of Chemistry
- Indian Institute of Technology
- New Delhi
- India
| | - Rupali Shekhawat
- Department of Chemistry
- Indian Institute of Technology
- New Delhi
- India
| | - Shashank Deep
- Department of Chemistry
- Indian Institute of Technology
- New Delhi
- India
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59
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Allmendinger A, Mueller R, Huwyler J, Mahler HC, Fischer S. Sterile Filtration of Highly Concentrated Protein Formulations: Impact of Protein Concentration, Formulation Composition, and Filter Material. J Pharm Sci 2015; 104:3319-29. [DOI: 10.1002/jps.24561] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 05/12/2015] [Accepted: 06/08/2015] [Indexed: 02/02/2023]
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60
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Gerhardt A, Mcumber AC, Nguyen BH, Lewus R, Schwartz DK, Carpenter JF, Randolph TW. Surfactant Effects on Particle Generation in Antibody Formulations in Pre-filled Syringes. J Pharm Sci 2015; 104:4056-4064. [PMID: 26413998 DOI: 10.1002/jps.24654] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Revised: 09/01/2015] [Accepted: 09/02/2015] [Indexed: 12/15/2022]
Abstract
Protein aggregation and particle formation have been observed when protein solutions contact hydrophobic interfaces, and it has been suggested that this undesirable phenomenon may be initiated by interfacial adsorption and subsequent gelation of the protein. The addition of surfactants, such as polysorbate 20, to protein formulations has been proposed as a way to reduce protein adsorption at silicone oil-water interfaces and mitigate the production of aggregates and particles. In an accelerated stability study, monoclonal antibody formulations containing varying concentrations of polysorbate 20 were incubated and agitated in pre-filled glass syringes (PFS), exposing the protein to silicone oil-water interfaces at the siliconized syringe walls, air-water interfaces, and agitation stress. Following agitation in siliconized syringes that contained an air bubble, lower particle concentrations were measured in the surfactant-containing antibody formulations than in surfactant-free formulations. Polysorbate 20 reduced particle formation when added at concentrations above or below the critical micelle concentration (CMC). The ability of polysorbate 20 to decrease particle generation in PFS corresponded with its ability to inhibit gelation of the adsorbed protein layer, which was assessed by measuring the interfacial diffusion of individual antibody molecules at the silicone oil-water interface using total internal reflectance fluorescence (TIRF) microscopy with single-molecule tracking.
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Affiliation(s)
- Alana Gerhardt
- Department of Chemical and Biological Engineering, University of Colorado-Boulder, Boulder, Colorado
| | - Aaron C Mcumber
- Department of Chemical and Biological Engineering, University of Colorado-Boulder, Boulder, Colorado
| | - Bao H Nguyen
- Department of Chemical and Biological Engineering, University of Colorado-Boulder, Boulder, Colorado
| | - Rachael Lewus
- Formulation Sciences Department, MedImmune, Gaithersburg, Maryland
| | - Daniel K Schwartz
- Department of Chemical and Biological Engineering, University of Colorado-Boulder, Boulder, Colorado
| | - John F Carpenter
- Department of Pharmaceutical Sciences, University of Colorado-Denver, Aurora, Colorado
| | - Theodore W Randolph
- Department of Chemical and Biological Engineering, University of Colorado-Boulder, Boulder, Colorado.
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61
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Clark RH, Latypov RF, De Imus C, Carter J, Wilson Z, Manchulenko K, Brown ME, Ketchem RR. Remediating agitation-induced antibody aggregation by eradicating exposed hydrophobic motifs. MAbs 2015; 6:1540-50. [PMID: 25484048 PMCID: PMC4622659 DOI: 10.4161/mabs.36252] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Therapeutic antibodies must encompass drug product suitable attributes to be commercially marketed. An undesirable antibody characteristic is the propensity to aggregate. Although there are computational algorithms that predict the propensity of a protein to aggregate from sequence information alone, few consider the relevance of the native structure. The Spatial Aggregation Propensity (SAP) algorithm developed by Chennamsetty et. al. incorporates structural and sequence information to identify motifs that contribute to protein aggregation. We have utilized the algorithm to design variants of a highly aggregation prone IgG2. All variants were tested in a variety of high-throughput, small-scale assays to assess the utility of the method described herein. Many variants exhibited improved aggregation stability whether induced by agitation or thermal stress while still retaining bioactivity.
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Affiliation(s)
- Rutilio H Clark
- a Department of Therapeutic Discovery; Amgen Inc. ; Thousand Oaks , CA USA
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62
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Kumamoto J, Kitahata H, Goto M, Nagayama M, Denda M. Effects of medium flow on axon growth with or without nerve growth factor. Biochem Biophys Res Commun 2015. [DOI: 10.1016/j.bbrc.2015.07.104] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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63
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Abstract
It is well recognized that protein product development is far more challenging than that for small-molecule drugs. The major challenges include inherent sensitivity to different types of stresses during the drug product manufacturing process, high rate of physical and chemical degradation during long-term storage, and enhanced aggregation and/or viscosity at high protein concentrations. In the past decade, many novel formulation concepts and technologies have been or are being developed to address these product development challenges for proteins. These concepts and technologies include use of uncommon/combination of formulation stabilizers, conjugation or fusion with potential stabilizers, site-specific mutagenesis, and preparation of nontraditional types of dosage forms-semiaqueous solutions, nonfreeze-dried solid formulations, suspensions, and other emerging concepts. No one technology appears to be mature, ideal, and/or adequate to address all the challenges. These gaps will likely remain in the foreseeable future and need significant efforts for ultimate resolution.
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Affiliation(s)
- Wei Wang
- BioTherapeutics Pharmaceutical Sciences, Pfizer Inc, 700 Chesterfield Parkway West, Chesterfield, MO, 63017.,Wang Biologics, LLC, 907 Wellesley Place, Chesterfield, Missouri, 63017
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64
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Gerhardt A, Nguyen BH, Lewus R, Carpenter JF, Randolph TW. Effect of the Siliconization Method on Particle Generation in a Monoclonal Antibody Formulation in Pre-filled Syringes. J Pharm Sci 2015; 104:1601-9. [DOI: 10.1002/jps.24387] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 01/15/2015] [Accepted: 01/21/2015] [Indexed: 01/13/2023]
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65
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Mehta SB, Lewus R, Bee JS, Randolph TW, Carpenter JF. Gelation of a Monoclonal Antibody at the Silicone Oil–Water Interface and Subsequent Rupture of the Interfacial Gel Results in Aggregation and Particle Formation. J Pharm Sci 2015; 104:1282-90. [DOI: 10.1002/jps.24358] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 12/19/2014] [Accepted: 12/22/2014] [Indexed: 12/14/2022]
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66
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Krayukhina E, Tsumoto K, Uchiyama S, Fukui K. Effects of syringe material and silicone oil lubrication on the stability of pharmaceutical proteins. J Pharm Sci 2014; 104:527-35. [PMID: 25256796 PMCID: PMC4359023 DOI: 10.1002/jps.24184] [Citation(s) in RCA: 107] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 08/28/2014] [Accepted: 09/02/2014] [Indexed: 12/28/2022]
Abstract
Currently, polymer-based prefillable syringes are being promoted to the pharmaceutical market because they provide an increased break resistance relative to traditionally used glass syringes. Despite this significant advantage, the possibility that barrel material can affect the oligomeric state of the protein drug exists. The present study was designed to compare the effect of different syringe materials and silicone oil lubrication on the protein aggregation. The stability of a recombinant fusion protein, abatacept (Orencia), and a fully human recombinant immunoglobulin G1, adalimumab (Humira), was assessed in silicone oil-free (SOF) and silicone oil-lubricated 1-mL glass syringes and polymer-based syringes in accelerated stress study. Samples were subjected to agitation stress, and soluble aggregate levels were evaluated by size-exclusion chromatography and verified with analytical ultracentrifugation. In accordance with current regulatory expectations, the amounts of subvisible particles resulting from agitation stress were estimated using resonant mass measurement and dynamic flow-imaging analyses. The amount of aggregated protein and particle counts were similar between unlubricated polymer-based and glass syringes. The most significant protein loss was observed for lubricated glass syringes. These results suggest that newly developed SOF polymer-based syringes are capable of providing biopharmaceuticals with enhanced physical stability upon shipping and handling. © 2014 Wiley Periodicals, Inc. and the American Pharmacists Association J Pharm Sci 104:527–535, 2015
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Affiliation(s)
- Elena Krayukhina
- Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan; U-Medico Inc., Suita, Osaka, 565-0871, Japan
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67
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Gerhardt A, Mcgraw NR, Schwartz DK, Bee JS, Carpenter JF, Randolph TW. Protein Aggregation and Particle Formation in Prefilled Glass Syringes. J Pharm Sci 2014; 103:1601-12. [DOI: 10.1002/jps.23973] [Citation(s) in RCA: 116] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2014] [Revised: 03/10/2014] [Accepted: 03/25/2014] [Indexed: 12/12/2022]
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68
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Castellanos MM, Pathak JA, Colby RH. Both protein adsorption and aggregation contribute to shear yielding and viscosity increase in protein solutions. SOFT MATTER 2014; 10:122-131. [PMID: 24651563 DOI: 10.1039/c3sm51994e] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A combination of sensitive rotational rheometry and surface rheometry with a double-wall ring were used to identify the origins of the viscosity increase at low shear rates in protein solutions. The rheology of two high molecular weight proteins is discussed: Bovine Serum Albumin (BSA) in a Phosphate Buffered Saline solution and an IgG1 monoclonal antibody (mAb) in a formulation buffer containing small quantities of a non-ionic surfactant. For surfactant-free BSA solutions, the interfacial viscosity dominates the low shear viscosity measured in rotational rheometers, while the surfactant-laden mAb solution has an interfacial viscosity that is small compared to that from aggregation in the bulk. A viscoelastic film forms at the air/water interface in the absence of surfactant, contributing to an apparent yield stress (thus a low shear viscosity increase) in conventional bulk rheology measurements. Addition of surfactant eliminates the interfacial yield stress. Evidence of a bulk yield stress arising from protein aggregation is presented, and correlated with results from standard characterization techniques used in the bio-pharmaceutical industry. The protein film at the air/water interface and bulk aggregates both lead to an apparent viscosity increase and their contributions are quantified using a dimensionless ratio of the interfacial and total yield stress. While steady shear viscosities at shear rates below ∼1 s(-1) contain rich information about the stability of protein solutions, embodied in the measured yield stress, such low shear rate data are regrettably often not measured and reported in the literature.
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Affiliation(s)
- Maria Monica Castellanos
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
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69
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Wiesbauer J, Prassl R, Nidetzky B. Renewal of the air-water interface as a critical system parameter of protein stability: aggregation of the human growth hormone and its prevention by surface-active compounds. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:15240-50. [PMID: 24224491 DOI: 10.1021/la4028223] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Soluble proteins are often highly unstable under mixing conditions that involve dynamic contacting between the main liquid phase and a gas phase. The recombinant human growth hormone (rhGH) was recently shown to undergo aggregation into micrometer-sized solid particles composed of non-native (mis- or unfolded) protein, once its solutions were stirred or shaken to generate a continuously renewed air-water interface. To gain deepened understanding and improved quantification of the air-water interface effect on rhGH stability, we analyzed the protein's aggregation rate (r(agg)) at controlled specific air-water surface areas (a(G/L)) established by stirring or bubble aeration. We show that in spite of comparable time-averaged values for a(G/L) (≈ 100 m(2)/m(3)), aeration gave a 40-fold higher r(agg) than stirring. The enhanced r(agg) under aeration was ascribed to faster macroscopic regeneration of free a(G/L) during aeration as compared to stirring. We also show that r(agg) was independent of the rhGH concentration in the range 0.67 - 6.7 mg/mL, and that it increased linearly dependent on the available a(G/L). The nonionic surfactant Pluronic F-68, added in 1.6-fold molar excess over rhGH present, resulted in complete suppression of r(agg). Foam formation was not a factor influencing r(agg). Using analysis by circular dichroism spectroscopy and small-angle X-ray scattering, we show that in the presence of Pluronic F-68 under both stirring and aeration, the soluble protein retained its original fold, featuring native-like relative composition of secondary structural elements. We further provide evidence that the efficacy of Pluronic F-68 resulted from direct, probably hydrophobic protein-surfactant interactions that prevented rhGH from becoming attached to the air-water interface. Surface-induced aggregation of rhGH is suggested to involve desorption of non-native protein from the air-water interface as the key limiting step. Proteins or protein aggregates released back into the bulk liquid appear to be essentially insoluble.
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70
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Jetani HC, Bhadra AK, Jain NK, Roy I. Nucleic acid aptamers stabilize proteins against different types of stress conditions. J Pharm Sci 2013; 103:100-6. [PMID: 24258428 DOI: 10.1002/jps.23785] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 10/18/2013] [Accepted: 10/25/2013] [Indexed: 01/14/2023]
Abstract
It has been observed that the same osmolyte cannot provide protection to a protein exposed to more than one stress condition. We wanted to study the effect of nucleic acid aptamers on the stabilization of proteins against a variety of stress conditions. Adjuvanted tetanus toxoid was exposed to thermal, freeze-thawing, and agitation stress. The stability and antigenicity of the toxoid were measured. Using nucleic acid aptamers selected against tetanus toxoid, we show that these specific RNA sequences were able to stabilize alumina-adsorbed tetanus toxoid against thermal-, agitation-, and freeze-thawing-induced stress. Binding affinity of the aptamer-protein complex did not show any significant change at elevated temperature as compared with that at room temperature, indicating that the aptamer protected the protein by remaining bound to it under stress conditions and did not allow either the protein to unfold or to promote protein-protein interaction. Thus, we show that by changing the stabilization strategy from a solvent-centric to a protein-centric approach, the same molecule can be employed as a stabilizer against more than one stress condition and thus probably reduce the cost of the product during its formulation.
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Affiliation(s)
- Hardik C Jetani
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research (NIPER), Punjab, 160 062, India
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