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Iannacci F, Medeiros Garcia Alcântara J, Marani M, Camesasca P, Chen M, Sousa F, Morbidelli M, Sponchioni M. High-density perfusion cultures of the marine bacterium Rhodovulum sulfidophilum for the biomanufacturing of oligonucleotides. J Biotechnol 2024; 392:152-160. [PMID: 39025367 DOI: 10.1016/j.jbiotec.2024.07.010] [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: 04/02/2024] [Revised: 06/14/2024] [Accepted: 07/12/2024] [Indexed: 07/20/2024]
Abstract
Therapeutic oligonucleotides (ONs) are typically manufactured via solid-phase synthesis, characterized by limited scalability and huge environmental footprint, limiting their availability. Biomanufactured ONs have the potential to reduce the immunogenic side-effects, and to improve the sustainability of their chemical counterparts. Rhodovulum sulfidophilum was demonstrated a valuable host for the extracellular production of recombinant ONs. However, low viable cell densities and product titer were reported so far. In this work, perfusion cell cultures were established for the intensification of ON biomanufacturing. First, the perfusion conditions were simulated in 50 mL spin tubes, selected as a scale-down model of the process, with the aim of optimizing the medium composition and process parameters. This optimization stage led to an increase in the cell density by 44 % compared to the reference medium formulation. In addition, tests at increasing perfusion rates were conducted until achieving the maximum viable cell density (VCDmax), allowing the determination of the minimum cell-specific perfusion rate (CSPRmin) required to sustain the cell culture. Intriguingly, we discovered in this system also a maximum CSPR, above which growth inhibition starts. By leveraging this process optimization, we show for the first time the conduction of perfusion cultures of R. sulfidophilum in bench-scale bioreactors. This process development pipeline allowed stable cultures for more than 20 days and the continuous biomanufacturing of ONs, testifying the great potential of perfusion processes.
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Affiliation(s)
- Francesco Iannacci
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, via Mancinelli 7, Milano 20131, Italy
| | - João Medeiros Garcia Alcântara
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, via Mancinelli 7, Milano 20131, Italy
| | - Martina Marani
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, via Mancinelli 7, Milano 20131, Italy
| | - Paolo Camesasca
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, via Mancinelli 7, Milano 20131, Italy
| | - Michele Chen
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, via Mancinelli 7, Milano 20131, Italy
| | - Fani Sousa
- CICS-UBI - Health Sciences Research Centre, University of Beira Interior, Av. Infante D. Henrique, Covilhã 6200-506, Portugal
| | - Massimo Morbidelli
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, via Mancinelli 7, Milano 20131, Italy
| | - Mattia Sponchioni
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano, via Mancinelli 7, Milano 20131, Italy.
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2
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Yehya H, Raudins S, Padmanabhan R, Jensen J, Bukys MA. Addressing bioreactor hiPSC aggregate stability, maintenance and scaleup challenges using a design of experiment approach. Stem Cell Res Ther 2024; 15:191. [PMID: 38956608 PMCID: PMC11218057 DOI: 10.1186/s13287-024-03802-4] [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: 10/27/2023] [Accepted: 06/16/2024] [Indexed: 07/04/2024] Open
Abstract
BACKGROUND Stem cell-derived therapies hold the potential for treatment of regenerative clinical indications. Static culture has a limited ability to scale up thus restricting its use. Suspension culturing can be used to produce target cells in large quantities, but also presents challenges related to stress and aggregation stability. METHODS Utilizing a design of experiments (DoE) approach in vertical wheel bioreactors, we evaluated media additives that have versatile properties. The additives evaluated are Heparin sodium salt (HS), polyethylene glycol (PEG), poly (vinyl alcohol) (PVA), Pluronic F68 and dextran sulfate (DS). Multiple response variables were chosen to assess cell growth, pluripotency maintenance and aggregate stability in response to the additive inputs, and mathematical models were generated and tuned for maximal predictive power. RESULTS Expansion of iPSCs using 100 ml vertical wheel bioreactor assay for 4 days on 19 different media combinations resulted in models that can optimize pluripotency, stability, and expansion. The expansion optimization resulted in the combination of PA, PVA and PEG with E8. This mixture resulted in an expansion doubling time that was 40% shorter than that of E8 alone. Pluripotency optimizer highlighted the importance of adding 1% PEG to the E8 medium. Aggregate stability optimization that minimizes aggregate fusion in 3D culture indicated that the interaction of both Heparin and PEG can limit aggregation as well as increase the maintenance capacity and expansion of hiPSCs, suggesting that controlling fusion is a critical parameter for expansion and maintenance. Validation of optimized solution on two cell lines in bioreactors with decreased speed of 40 RPM, showed consistency and prolonged control over aggregates that have high frequency of pluripotency markers of OCT4 and SOX2 (> 90%). A doubling time of around 1-1.4 days was maintained after passaging as clumps in the optimized medium. Controlling aggregate fusion allowed for a decrease in bioreactor speed and therefore shear stress exerted on the cells in a large-scale expansion. CONCLUSION This study resulted in a control of aggregate size within suspension cultures, while informing about concomitant state control of the iPSC state. Wider application of this approach can address media optimization complexity and bioreactor scale-up challenges.
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Affiliation(s)
- Haneen Yehya
- Trailhead Biosystems, 23215 Commerce Park, Beachwood, OH, 44122, USA
- Cleveland State University, 2121 Euclid Ave, Cleveland, OH, 44115, USA
| | - Sofija Raudins
- Trailhead Biosystems, 23215 Commerce Park, Beachwood, OH, 44122, USA
| | | | - Jan Jensen
- Trailhead Biosystems, 23215 Commerce Park, Beachwood, OH, 44122, USA
| | - Michael A Bukys
- Trailhead Biosystems, 23215 Commerce Park, Beachwood, OH, 44122, USA.
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3
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Wang H, Hu X, Zhang M, Yang L, Xu Y, Gu X, Jiang J, Hu W. Development of an HSV-1 production process involving serum-reduced culturing and bead-to-bead transfer. Appl Microbiol Biotechnol 2024; 108:383. [PMID: 38896301 PMCID: PMC11186949 DOI: 10.1007/s00253-024-13193-4] [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: 01/02/2024] [Revised: 05/10/2024] [Accepted: 05/21/2024] [Indexed: 06/21/2024]
Abstract
Herpes simplex virus type 1 (HSV-1) plays an important role in the field of gene therapy and viral vaccines, especially as an oncolytic virus. However, the mass production of HSV-1 viral vectors remains a challenge in the industry. In this study, a microcarrier-mediated serum-reduced medium culture was used to improve the bioprocess of HSV-1 production and increase HSV-1 yields. The composition of the culture media, which included a basal medium, serum concentration, and glutamine additive, was optimized. The process was successfully conducted in a 1 L bioreactor, and virus production was threefold greater than that of conventional processes with a 10% serum medium. The bead-to-bead transfer process was also developed to further increase scalability. In spinner flasks, the detachment rate increased from 49.4 to 80.6% when combined agitation was performed during digestion; the overall recovery proportion increased from 37.9 to 71.1% after the operational steps were optimized. Specifically, microcarrier loss was reduced during aspiration and transfer, and microcarriers and detached cells were separated with filters. Comparable cell growth was achieved with the baseline process using 2D culture as the inoculum by exchanging the subculture medium. To increase virus production after bead-to-bead transfer, critical parameters, including shear stress during digestion, TrypLE and EDTA concentrations in the subculture, and the CCI, were identified from 47 parameters via correlation analysis and principal component analysis. The optimized bead-to-bead transfer process achieved an average of 90.4% overall recovery and comparable virus production compared to that of the baseline process. This study is the first to report the optimization of HSV-1 production in Vero cells cultured on microcarriers in serum-reduced medium after bead-to-bead transfer. KEY POINTS: • An HSV-1 production process was developed that involves culturing in serum-reduced medium, and this process achieved threefold greater virus production than that of traditional processes. • An indirect bead-to-bead transfer process was developed with over 90% recovery yield in bioreactors. • HSV-1 production after bead-to-bead transfer was optimized and was comparable to that achieved with 2D culture as inoculum.
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Affiliation(s)
- Helin Wang
- Microbial and Viral Platforms (MVP), WuXi Biologics, 291 Fucheng Road, Hangzhou, 311106, China
| | - Xiuhua Hu
- Microbial and Viral Platforms (MVP), WuXi Biologics, 291 Fucheng Road, Hangzhou, 311106, China
| | - Mingfang Zhang
- Microbial and Viral Platforms (MVP), WuXi Biologics, 291 Fucheng Road, Hangzhou, 311106, China
| | - Lin Yang
- Microbial and Viral Platforms (MVP), WuXi Biologics, 291 Fucheng Road, Hangzhou, 311106, China
| | - Yueying Xu
- Microbial and Viral Platforms (MVP), WuXi Biologics, 291 Fucheng Road, Hangzhou, 311106, China
| | - Xiaoxu Gu
- Microbial and Viral Platforms (MVP), WuXi Biologics, 291 Fucheng Road, Hangzhou, 311106, China
| | - Junjun Jiang
- Microbial and Viral Platforms (MVP), WuXi Biologics, 291 Fucheng Road, Hangzhou, 311106, China.
| | - Weiwei Hu
- Microbial and Viral Platforms (MVP), WuXi Biologics, 291 Fucheng Road, Hangzhou, 311106, China.
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4
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Shi X, Rao R, Xu M, Dong M, Feng S, Huang Y, Zhou B. Methylcellulose improves dissociation quality of adult human primary cardiomyocytes. Heliyon 2024; 10:e31653. [PMID: 38841456 PMCID: PMC11152705 DOI: 10.1016/j.heliyon.2024.e31653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 05/16/2024] [Accepted: 05/20/2024] [Indexed: 06/07/2024] Open
Abstract
Obtaining high-quality adult human primary cardiomyocytes (hPCM) have been technically challenging due to isolation-induced biochemical and mechanical stress. Building upon a previous tissue slicing-assisted digestion method, we introduced polymers into the digestion solution to reduce mechanical damage to cells. We found that low-viscosity methylcellulose (MC) significantly improved hPCM viability and yield. Mechanistically, it protected cells from membrane damage, which led to decreased apoptosis and mitochondrial reactive oxygen species production. MC also improved the electrophysiological properties of hPCMs by maintaining the density of sodium channels. The effects on cell viability and cell yield effects were not recapitulated by MC of larger viscosities, other cellulose derivatives, nor shear protectants polyethylene glycol and polyvinyl alcohol. Finally, MC also enhanced the isolation efficiency and the culture quality of hPCMs from diseased ventricular myocardium, expanding its potential applications. Our findings showed that the isolation quality of hPCMs can be further improved through the addition of a polymer, rendering hPCMs a more reliable cellular model for cardiac research.
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Affiliation(s)
- Xun Shi
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, 167 North Lishi Road, Xicheng District, Beijing, 100037, China
| | - Rongjia Rao
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, 167 North Lishi Road, Xicheng District, Beijing, 100037, China
| | - Miaomiao Xu
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, 167 North Lishi Road, Xicheng District, Beijing, 100037, China
| | - Mengqi Dong
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, 167 North Lishi Road, Xicheng District, Beijing, 100037, China
| | - Shanshan Feng
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, 167 North Lishi Road, Xicheng District, Beijing, 100037, China
| | - Yafei Huang
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, 167 North Lishi Road, Xicheng District, Beijing, 100037, China
| | - Bingying Zhou
- State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Science and Peking Union Medical College, 167 North Lishi Road, Xicheng District, Beijing, 100037, China
- Shenzhen Key Laboratory of Cardiovascular Disease, Fuwai Hospital Chinese Academy of Medical Science, Shenzhen, Shenzhen, China
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5
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Kawecki NS, Chen KK, Smith CS, Xie Q, Cohen JM, Rowat AC. Scalable Processes for Culturing Meat Using Edible Scaffolds. Annu Rev Food Sci Technol 2024; 15:241-264. [PMID: 38211941 DOI: 10.1146/annurev-food-072023-034451] [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] [Indexed: 01/13/2024]
Abstract
There is increasing consumer demand for alternative animal protein products that are delicious and sustainably produced to address concerns about the impacts of mass-produced meat on human and planetary health. Cultured meat has the potential to provide a source of nutritious dietary protein that both is palatable and has reduced environmental impact. However, strategies to support the production of cultured meats at the scale required for food consumption will be critical. In this review, we discuss the current challenges and opportunities of using edible scaffolds for scaling up the production of cultured meat. We provide an overview of different types of edible scaffolds, scaffold fabrication techniques, and common scaffold materials. Finally, we highlight potential advantages of using edible scaffolds to advance cultured meat production by accelerating cell growth and differentiation, providing structure to build complex 3D tissues, and enhancing the nutritional and sensory properties of cultured meat.
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Affiliation(s)
- N Stephanie Kawecki
- Department of Integrative Biology and Physiology, University of California, Los Angeles, Los Angeles, California, USA;
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California, USA
| | - Kathleen K Chen
- Department of Integrative Biology and Physiology, University of California, Los Angeles, Los Angeles, California, USA;
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California, USA
| | - Corinne S Smith
- Department of Integrative Biology and Physiology, University of California, Los Angeles, Los Angeles, California, USA;
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California, USA
| | - Qingwen Xie
- Department of Integrative Biology and Physiology, University of California, Los Angeles, Los Angeles, California, USA;
| | - Julian M Cohen
- Department of Integrative Biology and Physiology, University of California, Los Angeles, Los Angeles, California, USA;
| | - Amy C Rowat
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California, USA
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California, USA
- Department of Integrative Biology and Physiology, University of California, Los Angeles, Los Angeles, California, USA;
- Broad Stem Cell Center, University of California, Los Angeles, Los Angeles, California, USA
- Jonsson Comprehensive Cancer Center, University of California, Los Angeles, Los Angeles, California, USA
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6
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Xing Z, Duane G, O'Sullivan J, Chelius C, Smith L, Borys MC, Khetan A. Validation of a CFD model for cell culture bioreactors at large scale and its application in scale-up. J Biotechnol 2024; 387:79-88. [PMID: 38582408 DOI: 10.1016/j.jbiotec.2024.02.006] [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: 07/27/2023] [Revised: 11/28/2023] [Accepted: 02/18/2024] [Indexed: 04/08/2024]
Abstract
Among all the operating parameters that control the cell culture environment inside bioreactors, appropriate mixing and aeration are crucial to ensure sufficient oxygen supply, homogeneous mixing, and CO2 stripping. A model-based manufacturing facility fit approach was applied to define agitation and bottom air flow rates during the process scale-up from laboratory to manufacturing, of which computational fluid dynamics (CFD) was the core modeling tool. The realizable k-ε turbulent dispersed Eulerian gas-liquid flow model was established and validated using experimental values for the volumetric oxygen transfer coefficient (kLa). Model validation defined the process operating parameter ranges for application of the model, identified mixing issues (e.g., impeller flooding, dissolved oxygen gradients, etc.) and the impact of antifoam on kLa. Using the CFD simulation results as inputs to the models for oxygen demand, gas entrance velocity, and CO2 stripping aided in the design of the agitation and bottom air flow rates needed to meet cellular oxygen demand, control CO2 levels, mitigate risks for cell damage due to shear, foaming, as well as fire hazards due to high O2 levels in the bioreactor gas outlet. The recommended operating conditions led to the completion of five manufacturing runs with a 100% success rate. This model-based approach achieved a seamless scale-up and reduced the required number of at-scale development batches, resulting in cost and time savings of a cell culture commercialization process.
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Affiliation(s)
- Zizhuo Xing
- Biologics Development and Operations, Bristol Myers Squibb Company, Devens, MA 01434, USA.
| | - Gearóid Duane
- Manufacturing Science and Technology Biologics, Bristol Myers Squibb Company, Mulhuddart, Ireland
| | - Josiah O'Sullivan
- Manufacturing Science and Technology Biologics, Bristol Myers Squibb Company, Mulhuddart, Ireland
| | - Cynthia Chelius
- Biologics Development and Operations, Bristol Myers Squibb Company, Devens, MA 01434, USA
| | - Laura Smith
- Biologics Development and Operations, Bristol Myers Squibb Company, Devens, MA 01434, USA
| | - Michael C Borys
- Biologics Development and Operations, Bristol Myers Squibb Company, Devens, MA 01434, USA.
| | - Anurag Khetan
- Biologics Development and Operations, Bristol Myers Squibb Company, Devens, MA 01434, USA
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7
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McRae O, Walls PLL, Natarajan V, Antoniou C, Bird JC. Elucidating the effects of microbubble pinch-off dynamics on mammalian cell viability. Biotechnol Bioeng 2024; 121:524-534. [PMID: 37902645 DOI: 10.1002/bit.28582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 09/22/2023] [Accepted: 10/15/2023] [Indexed: 10/31/2023]
Abstract
In the biotechnology industry, ensuring the health and viability of mammalian cells, especially Chinese Hamster Ovary (CHO) cells, plays a significant role in the successful production of therapeutic agents. These cells are typically cultivated in aerated bioreactors, where they encounter fluid stressors from rapidly deforming bubbles. These stressors can disrupt essential biological processes and potentially lead to cell death. However, the impact of these transient, elevated stressors on cell viability remains elusive. In this study, we first employ /cgqamicrofluidics to expose CHO cells near to bubbles undergoing pinch-off, subsequently collecting and assaying the cells to quantify the reduction in viability. Observing a significant impact, we set out to understand this phenomenon. We leverage computational fluid dynamics and numerical particle tracking to map the stressor field history surrounding a rapidly deforming bubble. Separately, we expose CHO cells to a known stressor level in a flow constriction device, collecting and assaying the cells to quantify the reduction in viability. By integrating the numerical data and results from the flow constriction device experiments, we develop a predictive model for cell viability reduction. We validate this model by comparing its predictions to the earlier microfluidic results, observing good agreement. Our findings provide critical insights into the relationship between bubble-induced fluid stressors and mammalian cell viability, with implications for bioreactor design and cell culture protocol optimization in the biotechnology sector.
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Affiliation(s)
- Oliver McRae
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts, USA
| | - Peter L L Walls
- Department of Mechanical Engineering, Dunwoody College of Technology, Minneapolis, Minnesota, USA
| | | | - Chris Antoniou
- Global Processing Engineering, Biogen, Cambridge, Massachusetts, USA
| | - James C Bird
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts, USA
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8
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Iurashev D, Jones PA, Andreev N, Wang Y, Iwata-Kajihara T, Kraus B, Hernandez Bort JA. Scaling strategy for cell and gene therapy bioreactors based on turbulent parameters. Biotechnol J 2024; 19:e2300235. [PMID: 37906704 DOI: 10.1002/biot.202300235] [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: 05/23/2023] [Revised: 10/10/2023] [Accepted: 10/23/2023] [Indexed: 11/02/2023]
Abstract
So far, power input has been used as the main parameter for bioreactor scale-up/-down in upstream process development and manufacturing. The rationale is that maintaining a consistent power input per unit volume should result in comparable mixing times at different scales. However, shear generated from turbulent flow may compromise the integrity of non-robust cells such as those used during the production of cell and gene therapies, which may lead to low product quality and yield. Of particular interest is the Kolmogorov length parameter that characterizes the smallest turbulent eddies in a mixture. To understand its impact on scale-up/-down decisions, the distribution of Kolmogorov length along the trajectory flow of individual particles in bioreactors was estimated in silico with the help of computational fluid dynamics simulations. Specifically, in this study the scalability of iPSC-derived lymphocyte production and the impact of shear stress across various differentiation stages were investigated. The study used bioreactors of volumes from 0.1 to 10 L, which correspond to the scales most used for parameter optimization. Our findings, which align with in vitro runs, help determine optimal agitation speed and shear stress adjustments for process transfer between scales and bioreactor types, using vertically-oriented wheel and pitched-blade impellers. In addition, empirical models specific to the bioreactors used in this study were developed. The provided computational analysis in combination with experimental data supports selection of appropriate bioreactors and operating conditions for various cell and gene therapy process steps.
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Affiliation(s)
- Dmytro Iurashev
- Gene Therapy Process Development, Baxalta Innovations GmbH, a part of Takeda companies, Orth an der Donau, Austria
| | | | - Nadejda Andreev
- Cell Therapy, Takeda Pharmaceuticals USA, Cambridge, Massachusetts, USA
| | - Yana Wang
- Cell Therapy, Takeda Pharmaceuticals USA, Cambridge, Massachusetts, USA
| | - Tomoko Iwata-Kajihara
- Cell Therapy Process Development and Manufacturing, Takeda Pharmaceuticals Japan, Muraoka-Higashi, Fujisawa-shi, Kanagawa, Japan
| | - Barbara Kraus
- Gene Therapy Process Development, Baxalta Innovations GmbH, a part of Takeda companies, Orth an der Donau, Austria
| | - Juan A Hernandez Bort
- Gene Therapy Process Development, Baxalta Innovations GmbH, a part of Takeda companies, Orth an der Donau, Austria
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9
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Zhang K, Barbieri E, LeBarre J, Rameez S, Mostafa S, Menegatti S. Peptonics: A new family of cell-protecting surfactants for the recombinant expression of therapeutic proteins in mammalian cell cultures. Biotechnol J 2024; 19:e2300261. [PMID: 37844203 DOI: 10.1002/biot.202300261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 08/08/2023] [Accepted: 10/05/2023] [Indexed: 10/18/2023]
Abstract
Polymer surfactants are key components of cell culture media as they prevent mechanical damage during fermentation in stirred bioreactors. Among cell-protecting surfactants, Pluronics are widely utilized in biomanufacturing to ensure high cell viability and productivity. Monodispersity of monomer sequence and length is critical for the effectiveness of Pluronics-since minor deviations can damage the cells-but is challenging to achieve due to the stochastic nature of polymerization. Responding to this challenge, this study introduces Peptonics, a novel family of peptide and peptoid surfactants whose monomer composition and sequence are designed to achieve high cell viability and productivity at a fraction of chain length and cost of Pluronics. A designed ensemble of Peptonics was initially characterized via light scattering and tensiometry to select sequences whose phase behavior and tensioactivity align with those of Pluronics. Selected sequences were evaluated as cell-protecting surfactants using Chinese hamster ovary (CHO) cells expressing therapeutic monoclonal antibodies (mAb). Peptonics IH-T1010, ih-T1010, and ih-T1020 afforded high cell density (up to 3 × 107 cells mL-1 ) and viability (up to 95% within 10 days of culture), while reducing the accumulation of ammonia (a toxic metabolite) by ≈10% compared to Pluronic F-68. Improved cell viability afforded high mAb titer (up to 5.5 mg mL-1 ) and extended the production window beyond 14 days; notably, Peptonic IH-T1020 decreased mAb fragmentation and aggregation ≈5%, and lowered the titer of host cell proteins by 16% compared to Pluronic F-68. These features can improve significantly the purification of mAbs, thus increasing their availability at a lower cost to patients.
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Affiliation(s)
- Ka Zhang
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina, USA
- KBI Biopharma, Durham, North Carolina, USA
| | - Eduardo Barbieri
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina, USA
- LigaTrap Technologies LLC, Raleigh, North Carolina, USA
| | - Jacob LeBarre
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina, USA
| | | | | | - Stefano Menegatti
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina, USA
- LigaTrap Technologies LLC, Raleigh, North Carolina, USA
- Biomanufacturing Training and Education Center (BTEC), North Carolina State University, Raleigh, North Carolina, USA
- North Carolina Viral Vector Initiative in Research and Learning (NC-VVIRAL), North Carolina State University, Raleigh, North Carolina, USA
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10
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Cortés-Sánchez JL, Melnik D, Sandt V, Kahlert S, Marchal S, Johnson IRD, Calvaruso M, Liemersdorf C, Wuest SL, Grimm D, Krüger M. Fluid and Bubble Flow Detach Adherent Cancer Cells to Form Spheroids on a Random Positioning Machine. Cells 2023; 12:2665. [PMID: 37998400 PMCID: PMC10670461 DOI: 10.3390/cells12222665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 11/10/2023] [Accepted: 11/17/2023] [Indexed: 11/25/2023] Open
Abstract
In preparing space and microgravity experiments, the utilization of ground-based facilities is common for initial experiments and feasibility studies. One approach to simulating microgravity conditions on Earth is to employ a random positioning machine (RPM) as a rotary bioreactor. Combined with a suitable low-mass model system, such as cell cultures, these devices simulating microgravity have been shown to produce results similar to those obtained in a space experiment under real microgravity conditions. One of these effects observed under real and simulated microgravity is the formation of spheroids from 2D adherent cancer cell cultures. Since real microgravity cannot be generated in a laboratory on Earth, we aimed to determine which forces lead to the detachment of individual FTC-133 thyroid cancer cells and the formation of tumor spheroids during culture with exposure to random positioning modes. To this end, we subdivided the RPM motion into different static and dynamic orientations of cell culture flasks. We focused on the molecular activation of the mechanosignaling pathways previously associated with spheroid formation in microgravity. Our results suggest that RPM-induced spheroid formation is a two-step process. First, the cells need to be detached, induced by the cell culture flask's rotation and the subsequent fluid flow, as well as the presence of air bubbles. Once the cells are detached and in suspension, random positioning prevents sedimentation, allowing 3D aggregates to form. In a comparative shear stress experiment using defined fluid flow paradigms, transcriptional responses were triggered comparable to exposure of FTC-133 cells to the RPM. In summary, the RPM serves as a simulator of microgravity by randomizing the impact of Earth's gravity vector especially for suspension (i.e., detached) cells. Simultaneously, it simulates physiological shear forces on the adherent cell layer. The RPM thus offers a unique combination of environmental conditions for in vitro cancer research.
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Affiliation(s)
- José Luis Cortés-Sánchez
- Department of Microgravity and Translational Regenerative Medicine, Otto-von-Guericke University, 39106 Magdeburg, Germany; (J.L.C.-S.); (D.M.); (V.S.); (S.M.); (D.G.)
| | - Daniela Melnik
- Department of Microgravity and Translational Regenerative Medicine, Otto-von-Guericke University, 39106 Magdeburg, Germany; (J.L.C.-S.); (D.M.); (V.S.); (S.M.); (D.G.)
- Research Group “Magdeburger Arbeitsgemeinschaft für Forschung unter Raumfahrt- und Schwerelosigkeitsbedingungen” (MARS), Otto-von-Guericke University, 39106 Magdeburg, Germany
| | - Viviann Sandt
- Department of Microgravity and Translational Regenerative Medicine, Otto-von-Guericke University, 39106 Magdeburg, Germany; (J.L.C.-S.); (D.M.); (V.S.); (S.M.); (D.G.)
| | - Stefan Kahlert
- Institute of Anatomy, University Hospital Magdeburg, 39120 Magdeburg, Germany;
| | - Shannon Marchal
- Department of Microgravity and Translational Regenerative Medicine, Otto-von-Guericke University, 39106 Magdeburg, Germany; (J.L.C.-S.); (D.M.); (V.S.); (S.M.); (D.G.)
| | - Ian R. D. Johnson
- Research in Space Environments Group, UniSA Clinical and Health Sciences, University of South Australia, Adelaide, SA 5000, Australia;
| | - Marco Calvaruso
- Institute of Bioimaging and Molecular Physiology, National Research Council (IBFM-CNR), 90015 Cefalù, Italy;
| | - Christian Liemersdorf
- Department of Gravitational Biology, Institute of Aerospace Medicine, German Aerospace Center, 51147 Cologne, Germany;
| | - Simon L. Wuest
- Institute of Medical Engineering, Lucerne University of Applied Sciences and Arts, 6052 Hergiswil, Switzerland;
| | - Daniela Grimm
- Department of Microgravity and Translational Regenerative Medicine, Otto-von-Guericke University, 39106 Magdeburg, Germany; (J.L.C.-S.); (D.M.); (V.S.); (S.M.); (D.G.)
- Research Group “Magdeburger Arbeitsgemeinschaft für Forschung unter Raumfahrt- und Schwerelosigkeitsbedingungen” (MARS), Otto-von-Guericke University, 39106 Magdeburg, Germany
- Department of Biomedicine, Aarhus University, 8000 Aarhus C, Denmark
| | - Marcus Krüger
- Department of Microgravity and Translational Regenerative Medicine, Otto-von-Guericke University, 39106 Magdeburg, Germany; (J.L.C.-S.); (D.M.); (V.S.); (S.M.); (D.G.)
- Research Group “Magdeburger Arbeitsgemeinschaft für Forschung unter Raumfahrt- und Schwerelosigkeitsbedingungen” (MARS), Otto-von-Guericke University, 39106 Magdeburg, Germany
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11
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Göbel S, Jaén KE, Fernandes RP, Reiter M, Altomonte J, Reichl U, Genzel Y. Characterization of a quail suspension cell line for production of a fusogenic oncolytic virus. Biotechnol Bioeng 2023; 120:3335-3346. [PMID: 37584190 DOI: 10.1002/bit.28530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 07/11/2023] [Accepted: 08/06/2023] [Indexed: 08/17/2023]
Abstract
The development of efficient processes for the production of oncolytic viruses (OV) plays a crucial role regarding the clinical success of virotherapy. Although many different OV platforms are currently under investigation, manufacturing of such viruses still mainly relies on static adherent cell cultures, which bear many challenges, particularly for fusogenic OVs. Availability of GMP-compliant continuous cell lines is limited, further complicating the development of commercially viable products. BHK21, AGE1. CR and HEK293 cells were previously identified as possible cell substrates for the recombinant vesicular stomatitis virus (rVSV)-based fusogenic OV, rVSV-NDV. Now, another promising cell substrate was identified, the CCX.E10 cell line, developed by Nuvonis Technologies. This suspension cell line is considered non-GMO as no foreign genes or viral sequences were used for its development. The CCX.E10 cells were thus thoroughly investigated as a potential candidate for OV production. Cell growth in the chemically defined medium in suspension resulted in concentrations up to 8.9 × 106 cells/mL with a doubling time of 26.6 h in batch mode. Cultivation and production of rVSV-NDV, was demonstrated successfully for various cultivation systems (ambr15, shake flask, stirred tank reactor, and orbitally shaken bioreactor) at vessel scales ranging from 15 mL to 10 L. High infectious virus titers of up to 4.2 × 108 TCID50 /mL were reached in orbitally shaken bioreactors and stirred tank reactors in batch mode, respectively. Our results suggest that CCX.E10 cells are a very promising option for industrial production of OVs, particularly for fusogenic VSV-based constructs.
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Affiliation(s)
- Sven Göbel
- Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
| | - Karim E Jaén
- Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
- Department of Internal Medicine II, Klinikum Rechts der Isar, Technische Universität München, Munich, Germany
| | - Rita P Fernandes
- Instituto de Biologia Experimental e Tecnológica (iBET), Oeiras, Portugal
| | | | - Jennifer Altomonte
- Department of Internal Medicine II, Klinikum Rechts der Isar, Technische Universität München, Munich, Germany
| | - Udo Reichl
- Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
- Chair for Bioprocess Engineering, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
| | - Yvonne Genzel
- Bioprocess Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
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12
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Schlaich EM, Thomas JA, Kandari L, Tremml G, Khetan A. Experimental and computational characterization of mass transfer in high turndown bioreactors. Biotechnol Prog 2023; 39:e3330. [PMID: 36751946 DOI: 10.1002/btpr.3330] [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: 09/29/2022] [Revised: 01/17/2023] [Accepted: 01/18/2023] [Indexed: 02/09/2023]
Abstract
Single-use bioreactors (SUBs, or disposable bioreactors) are extensively used for the clinical and commercial production of biologics. Despite widespread application, minimal results have been reported utilizing the turndown ratio; an operation mode where the working range of the bioreactor can be expanded to include low fluid volumes. In this work, a systematic investigation into free surface mass transfer and cell growth in high turndown single-use bioreactors is presented. This approach, which combines experimental mass transfer measurements with numerical simulation, deconvolutes the combined effects of headspace mixing and the free surface convective mass transfer on cell growth. Under optimized conditions, mass transfer across the interface alone may be sufficient to satisfy oxygen demands of the cell culture. Within the context of high turndown bioreactors, this finding provides a counterpoint to traditional sparge-based bioreactor operational philosophy. Multiple monoclonal antibody-producing cell lines grown using this high turndown approach showed similar viable cell densities to those cells expanded using a traditional cell bag rocker. Furthermore, cells taken directly from the turndown expansion and placed into production showed identical growth characteristics to traditionally expanded cultures. Taken together, these results suggest that the Xcellerex SUB can be run at a 5:1 working volume as a seed to itself, with no need for system modifications, potentially simplifying preculture operations.
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Affiliation(s)
- Evan M Schlaich
- Biologics Development, Bristol Myers Squibb, New Brunswick, New Jersey, USA
| | - John A Thomas
- M-Star Simulations LLC, Ellicott City, Maryland, USA
| | - Lakshmi Kandari
- Biologics Development, Bristol Myers Squibb, New Brunswick, New Jersey, USA
| | - Gabi Tremml
- Biologics Development, Bristol Myers Squibb, New Brunswick, New Jersey, USA
| | - Anurag Khetan
- Biologics Development, Bristol Myers Squibb, New Brunswick, New Jersey, USA
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13
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Woo H, Kim JH. Effect of air stone pore size and gas flow rate on the recovery efficiency of paclitaxel from biomass in gas bubble-assisted extraction. KOREAN J CHEM ENG 2023. [DOI: 10.1007/s11814-023-1425-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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14
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Sharma R, Collair W, Williams A, Harrison ST, Tai SL. Design and engineering characterization of a Horizontal Tubular Bioreactor with spiral impeller for cell cultivation. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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15
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Wan Mahari WA, Wan Razali WA, Manan H, Hersi MA, Ishak SD, Cheah W, Chan DJC, Sonne C, Show PL, Lam SS. Recent advances on microalgae cultivation for simultaneous biomass production and removal of wastewater pollutants to achieve circular economy. BIORESOURCE TECHNOLOGY 2022; 364:128085. [PMID: 36220529 DOI: 10.1016/j.biortech.2022.128085] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 10/02/2022] [Accepted: 10/04/2022] [Indexed: 06/16/2023]
Abstract
Microalgae are known for containing high value compounds and its significant role in sequestering carbon dioxide. This review mainly focuses on the emerging microalgae cultivation technologies such as nanomaterials technology that can improve light distribution during microalgae cultivation, attached cultivation and co-cultivation approaches that can improve growth and proliferation of algal cells, biomass yield and lipid accumulation in microalgal. This review includes a comprehensive discussion on the use of microbubbles technology to enhance aerated bubble capacity in photobioreactor to improve microalgal growth. This is followed by discussion on the role of microalgae as phycoremediation agent in removal of contaminants from wastewater, leading to better water quality and high productivity of shellfish. The review also includes techno-economic assessment of microalgae biorefinery technology, which is useful for scaling up the microalgal biofuel production system or integrated microalgae-shellfish cultivation system to support circular economy.
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Affiliation(s)
- Wan Adibah Wan Mahari
- Henan Province Engineering Research Center for Biomass Value-added Products, School of Forestry, Henan Agricultural University, Henan 450002, Zhengzhou, China; Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, Terengganu 21030, Kuala Nerus, Malaysia
| | - Wan Aizuddin Wan Razali
- Faculty of Fisheries & Food Science, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia
| | - Hidayah Manan
- Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, Terengganu 21030, Kuala Nerus, Malaysia
| | - Mursal Abdulkadir Hersi
- Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, Terengganu 21030, Kuala Nerus, Malaysia
| | - Sairatul Dahlianis Ishak
- Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, Terengganu 21030, Kuala Nerus, Malaysia
| | - Wee Cheah
- Insitute of Ocean and Earth Sciences, Universiti Malaya, Kuala Lumpur, Malaysia
| | - Derek Juinn Chieh Chan
- School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia
| | - Christian Sonne
- Aarhus University, Department of Bioscience, Arctic Research Centre (ARC), Frederiksborgvej 399, PO Box 358, DK-4000 Roskilde, Denmark
| | - Pau Loke Show
- Department of Chemical Engineering, Faculty of Science and Engineering, University of Nottingham Malaysia, 43500 Selangor, Malaysia
| | - Su Shiung Lam
- Henan Province Engineering Research Center for Biomass Value-added Products, School of Forestry, Henan Agricultural University, Henan 450002, Zhengzhou, China; Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, Terengganu 21030, Kuala Nerus, Malaysia; Automotive Development Centre (ADC), Institute for Vehicle Systems and Engineering (IVeSE), Universiti Teknologi Malaysia (UTM), Johor Bahru, 81310, Johor, Malaysia; Sustainability Cluster, School of Engineering, University of Petroleum & Energy Studies, Dehradun, Uttarakhand 248007, India.
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16
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Arai T, Sato T, Matsubara T. Effective Cell Transfection in An Ultrasonically Levitated Droplet for Sustainable Technology. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2203576. [PMID: 36026571 PMCID: PMC9596829 DOI: 10.1002/advs.202203576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 08/17/2022] [Indexed: 06/15/2023]
Abstract
The levitation methodology, which enables us to operate a contactless reaction without a container, is likely to be a revolutionary technology in the fields of chemistry and biology to reduce the plastic waste in life science laboratories. Here, the authors show that plasmid DNA can be effectively transfected into animal cells in a floating droplet of culture medium levitated using ultrasonic standing waves. The data indicate that there is no significant damage to the plasmid and cells during the levitating transfection time, and the transgene expression efficiency and cellular uptake in the droplet are significantly higher than those in the conventional tube, with and without shaking. These results suggest the consolidation of the endocytic uptake pathway into macropinocytosis, indicating that ultrasonic levitation induced a change in cell characteristics. This study suggests that transfection methodology using ultrasonic levitation has the potential to advance the current experimental procedures in the field of cell engineering, in addition to presenting a revolutionary containerless reactor for sustainable technology.
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Affiliation(s)
- Takahiro Arai
- Department of Biosciences and InformaticsFaculty of Science and TechnologyKeio University3‐14‐1 Hiyoshi, Kohoku‐kuYokohamaKanagawa223–8522Japan
| | - Toshinori Sato
- Department of Biosciences and InformaticsFaculty of Science and TechnologyKeio University3‐14‐1 Hiyoshi, Kohoku‐kuYokohamaKanagawa223–8522Japan
| | - Teruhiko Matsubara
- Department of Biosciences and InformaticsFaculty of Science and TechnologyKeio University3‐14‐1 Hiyoshi, Kohoku‐kuYokohamaKanagawa223–8522Japan
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17
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Šrom O, Trávníková V, Bláha L, Ciofalo M, Šoóš M. Investigation of poloxamer cell protective ability via shear sensitive aggregates in stirred aerated bioreactor. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108549] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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18
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Bandyopadhyay A, Kosanam H, Yang RS, Gupta B, Naralakattu N, Pakhale S, Kress J, Richardson D, Ly J. Low-molecular-weight impurity in Poloxamer 188 responsible for atypical cell culture performance for mAb production. J Biotechnol 2022; 351:13-22. [PMID: 35483475 DOI: 10.1016/j.jbiotec.2022.04.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 04/12/2022] [Accepted: 04/21/2022] [Indexed: 11/26/2022]
Abstract
During a recent manufacturing campaign for a monoclonal antibody using a fed-batch process, poor cell culture performance was observed across two manufacturing sites with similar scales and equipment. Root cause analysis indicated that the poor cell culture performance was linked to the production basal media. Genealogy of the precursor raw materials used in the media revealed that a particular lot of Poloxamer 188 (P188) was the common link to the poor-performing media lots. P188 serves a critical role in protecting cells against shear in cell culture bioprocesses. However, the small-scale studies suggested that the poor cell culture performance was cytostatic in nature rather than being caused due to lack of shear protection. Several P188 lots were tested analytically using SEC-MS and RP-LC-MS methods and a unique low molecular weight species was identified in the suspect lot of poloxamer. The impurity was identified to be polypropylene oxide (PPO), a reaction intermediate in P188 synthesis. Spiking studies with PPO further confirmed its cytostatic nature. This case study highlights yet another scenario where lot-to-lot variability continues to impact bioprocesses and re-emphasizes the need for robust analytical and cell-culture raw material screening methods.
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Affiliation(s)
- Arpan Bandyopadhyay
- Biologics Process Development and Commercialization, Merck & Co., Inc, Kenilworth, New Jersey 07033, United States
| | - Hari Kosanam
- Vaccines Process Development and Commercialization, Merck & Co., Inc, Westpoint, Pennsylvania 19486, United States
| | - Rong-Sheng Yang
- Analytical Research & Development, Merck & Co., Inc, Kenilworth, New Jersey 07033, United States
| | - Balrina Gupta
- Biologics Upstream Process Development, Merck & Co., Inc, Kenilworth, New Jersey 07033, United States
| | - Naja Naralakattu
- Global Technical Operations - Raw Materials Center of Excellence, Merck & Co., Inc, Westpoint, Pennsylvania 19486, United States
| | - Shital Pakhale
- Biologics Process Development and Commercialization, Merck & Co., Inc, Kenilworth, New Jersey 07033, United States
| | - Jared Kress
- Vaccines Process Development and Commercialization, Merck & Co., Inc, Westpoint, Pennsylvania 19486, United States
| | - Douglas Richardson
- Analytical Research & Development, Merck & Co., Inc, Kenilworth, New Jersey 07033, United States
| | - Jeffrey Ly
- Biologics Process Development and Commercialization, Merck & Co., Inc, Kenilworth, New Jersey 07033, United States
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19
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Sharma R, Harrison STL, Tai SL. Advances in Bioreactor Systems for the Production of Biologicals in Mammalian Cells. CHEMBIOENG REVIEWS 2021. [DOI: 10.1002/cben.202100022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Rajesh Sharma
- University of Cape Town Centre for Bioprocess Engineering Research (CeBER) Department of Chemical Engineering Faculty of Engineering and the Built Environment Private Bag 7701 Rondebosch South Africa
| | - Susan T. L. Harrison
- University of Cape Town Centre for Bioprocess Engineering Research (CeBER) Department of Chemical Engineering Faculty of Engineering and the Built Environment Private Bag 7701 Rondebosch South Africa
| | - Siew Leng Tai
- University of Cape Town Centre for Bioprocess Engineering Research (CeBER) Department of Chemical Engineering Faculty of Engineering and the Built Environment Private Bag 7701 Rondebosch South Africa
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20
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Foster KM, Papavassiliou DV, O’Rear EA. Elongational Stresses and Cells. Cells 2021; 10:2352. [PMID: 34572002 PMCID: PMC8471242 DOI: 10.3390/cells10092352] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 09/04/2021] [Accepted: 09/04/2021] [Indexed: 01/03/2023] Open
Abstract
Fluid forces and their effects on cells have been researched for quite some time, especially in the realm of biology and medicine. Shear forces have been the primary emphasis, often attributed as being the main source of cell deformation/damage in devices like prosthetic heart valves and artificial organs. Less well understood and studied are extensional stresses which are often found in such devices, in bioreactors, and in normal blood circulation. Several microfluidic channels utilizing hyperbolic, abrupt, or tapered constrictions and cross-flow geometries, have been used to isolate the effects of extensional flow. Under such flow cell deformations, erythrocytes, leukocytes, and a variety of other cell types have been examined. Results suggest that extensional stresses cause larger deformation than shear stresses of the same magnitude. This has further implications in assessing cell injury from mechanical forces in artificial organs and bioreactors. The cells' greater sensitivity to extensional stress has found utility in mechanophenotyping devices, which have been successfully used to identify pathologies that affect cell deformability. Further application outside of biology includes disrupting cells for increased food product stability and harvesting macromolecules for biofuel. The effects of extensional stresses on cells remains an area meriting further study.
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Affiliation(s)
| | | | - Edgar A. O’Rear
- Department of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK 73019, USA; (K.M.F.); (D.V.P.)
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21
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Leinonen HM, Lepola S, Lipponen EM, Heikura T, Koponen T, Parker N, Ylä-Herttuala S, Lesch HP. Benchmarking of Scale-X Bioreactor System in Lentiviral and Adenoviral Vector Production. Hum Gene Ther 2021; 31:376-384. [PMID: 32075423 PMCID: PMC7087403 DOI: 10.1089/hum.2019.247] [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] [Indexed: 01/09/2023] Open
Abstract
We have previously produced viral vectors (lentiviral vector, adenoviral vector, and adeno-associated viral vector) in small and in commercial scale in adherent cells using Pall fixed-bed iCELLis® bioreactor. Recently, a company called Univercells has launched a new fixed-bed bioreactor with the same cell growth surface matrix material, but with different fixed-bed structure than is used in iCELLis bioreactor. We sought to compare the new scale-X™ hydro bioreactor (2.4 m2) and iCELLis Nano system (2.67 m2) to see if the difference has any effect on cell growth or lentiviral vector and adenoviral vector productivity. Runs were performed using parameters optimized for viral vector production in iCELLis Nano bioreactor. Cell growth was monitored by counting nuclei, as well as by following glucose consumption and lactate production. In both bioreactor systems, cells grew well, and the cell distribution was found quite homogeneous in scale-X bioreactor. Univercells scale-X bioreactor was proven to be at least equally efficient or even improved in both lentiviral vector and adenoviral vector production. Based on the results, the same protocol and parameters used in viral vector production in iCELLis bioreactor can also be successfully used for the production in scale-X bioreactor system.
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Affiliation(s)
- Hanna M Leinonen
- Kuopio Center for Gene and Cell Therapy, Kuopio, Finland.,FinVector, Kuopio, Finland; and
| | - Saana Lepola
- Kuopio Center for Gene and Cell Therapy, Kuopio, Finland.,FinVector, Kuopio, Finland; and
| | - Eevi M Lipponen
- Kuopio Center for Gene and Cell Therapy, Kuopio, Finland.,FinVector, Kuopio, Finland; and
| | - Tommi Heikura
- Molecular Medicine, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Tiina Koponen
- Molecular Medicine, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Nigel Parker
- Molecular Medicine, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Seppo Ylä-Herttuala
- Molecular Medicine, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Hanna P Lesch
- Kuopio Center for Gene and Cell Therapy, Kuopio, Finland.,FinVector, Kuopio, Finland; and
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22
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Structural and Biochemical Features of Human Serum Albumin Essential for Eukaryotic Cell Culture. Int J Mol Sci 2021; 22:ijms22168411. [PMID: 34445120 PMCID: PMC8395139 DOI: 10.3390/ijms22168411] [Citation(s) in RCA: 72] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/30/2021] [Accepted: 08/04/2021] [Indexed: 12/16/2022] Open
Abstract
Serum albumin physically interacts with fatty acids, small molecules, metal ions, and several other proteins. Binding with a plethora of bioactive substances makes it a critical transport molecule. Albumin also scavenges the reactive oxygen species that are harmful to cell survival. These properties make albumin an excellent choice to promote cell growth and maintain a variety of eukaryotic cells under in vitro culture environment. Furthermore, purified recombinant human serum albumin is mostly free from impurities and modifications, providing a perfect choice as an additive in cell and tissue culture media while avoiding any regulatory constraints. This review discusses key features of human serum albumin implicated in cell growth and survival under in vitro conditions.
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23
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CFD simulations of early- to fully-turbulent conditions in unbaffled and baffled vessels stirred by a Rushton turbine. Chem Eng Res Des 2021. [DOI: 10.1016/j.cherd.2021.04.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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24
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Yamamoto R, Kino-Oka M. Design of suspension culture system with bubble sparging for human induced pluripotent stem cells in a plastic fluid. J Biosci Bioeng 2021; 132:190-197. [PMID: 34052116 DOI: 10.1016/j.jbiosc.2021.04.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Revised: 04/19/2021] [Accepted: 04/22/2021] [Indexed: 11/29/2022]
Abstract
Bubble sparging has been used to supply oxygen to large-scale bioreactor systems. However, sparged bubbles cause cell death by rupturing due to shear stress, and the foam layer carries a risk of contamination. Large-scale culture of human induced pluripotent stem cells (hiPSCs) is required for manufacturing, but hiPSCs show high sensitivity to shear stress, and also, aseptic processing is important for their expansion. In this study, a culture system with bubble sparging for hiPSC proliferation was designed using a plastic fluid as a culture medium. The rising bubble velocity in the plastic fluid decreased and was lower than that in a Newtonian fluid when the time interval between bubbles generation, Δt, was greater than 0.14 s. Under this condition, aggregate distribution in the plastic fluid was maintained without liquid flow. Although large aeration induced aggregate coalescence and growth inhibition, the apparent specific growth rate at Δt > 0.14 s increased with an increase in the aeration rate, and the maximum value was similar to that of the conventional suspension culture in a stirred bioreactor system. The gas hold-up in the plastic fluid was higher than that in a Newtonian fluid because of the lower rising bubble velocity, which leads to the suppression of bubble sparging. Therefore, our results indicated that using a plastic fluid leads to a more efficient oxygen supply without agitation in a spatial-temporal phase-transition culture system.
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Affiliation(s)
- Riku Yamamoto
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Masahiro Kino-Oka
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
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25
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Diaz L, Li Y, Jenkins DM. Chemical stabilization of dispersed Escherichia coli for enhanced recovery with a handheld electroflotation system and detection by Loop-mediated Isothermal AMPlification. PLoS One 2021; 16:e0244956. [PMID: 33400712 PMCID: PMC7785231 DOI: 10.1371/journal.pone.0244956] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 12/18/2020] [Indexed: 11/19/2022] Open
Abstract
Constraints related to sample preparation are some of the primary obstacles to widespread deployment of molecular diagnostics for rapid detection of trace quantities (≤103 CFU/mL) of food-borne pathogens. In this research, we report a sample preparation method using a novel handheld electroflotation system to concentrate and recover dilute quantities (102-103 CFU/mL) of Escherichia coli (E. coli) 25922 in artificially contaminated samples for reliable, rapid detection by loop-mediated isothermal amplification (LAMP). To protect suspended cells from shear stresses at bubble surfaces, a non-ionic surfactant (Pluronic-F68) and flocculant (chitosan oligosaccharide) were used to aggregate cells and reduce their surface hydrophobicity. Effective conditions for recovery were determined through multifactorial experiments including various concentrations of Pluronic-F68 (0.001, 0.01, 0.1, 1 g L-1), chitosan oligosaccharide (0.01, 0.1, 1, 10 g L-1), bacteria (102, 103, 104 CFU/mL E. coli 25922), recovery times (10, 15 and 20 minutes), and degrees of turbulent gas flux ("high" and "low"). The automated electroflotation system was capable of concentrating effectively all of the bacteria from a large sample (380 mL 0.1 M potassium phosphate buffer containing 102 CFU/mL E. coli) into a 1 mL recovered fraction in less than 30 minutes. This enabled detection of bacterial contaminants within 2 hours of collecting the sample, without a specialized laboratory facility or traditional enrichment methods, with at least a 2-3 order of magnitude improvement in detection limit compared to direct assay with LAMP.
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Affiliation(s)
- Lena Diaz
- Department of Molecular Biosciences & Bioengineering, University of Hawaii at Manoa, Honolulu, Hawaii, United States of America
| | - Yong Li
- Department of Human Nutrition, Food, and Animal Science, University of Hawaii at Manoa, Honolulu, Hawaii, United States of America
| | - Daniel M. Jenkins
- Department of Molecular Biosciences & Bioengineering, University of Hawaii at Manoa, Honolulu, Hawaii, United States of America
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Garcia-Ochoa F, Gomez E, Santos VE. Fluid dynamic conditions and oxygen availability effects on microbial cultures in STBR: An overview. Biochem Eng J 2020. [DOI: 10.1016/j.bej.2020.107803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Numerical Methods for the Design and Description of In Vitro Expansion Processes of Human Mesenchymal Stem Cells. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2020; 177:185-228. [PMID: 33090237 DOI: 10.1007/10_2020_147] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Human mesenchymal stem cells (hMSCs) are a valuable source of cells for clinical applications (e.g., treatment of acute myocardial infarction or inflammatory diseases), especially in the field of regenerative medicine. However, for autologous (patient-specific) and allogeneic (off-the-shelf) hMSC-based therapies, in vitro expansion is necessary prior to the clinical application in order to achieve the required cell numbers. Safe, reproducible, and economic in vitro expansion of hMSCs for autologous and allogeneic therapies can be problematic because the cell material is restricted and the cells are sensitive to environmental changes. It is beneficial to collect detailed information on the hydrodynamic conditions and cell growth behavior in a bioreactor system, in order to develop a so called "Digital Twin" of the cultivation system and expansion process. Numerical methods, such as Computational Fluid Dynamics (CFD) which has become widely used in the biotech industry for studying local characteristics within bioreactors or kinetic growth modelling, provide possible solutions for such tasks.In this review, we will present the current state-of-the-art for the in vitro expansion of hMSCs. Different numerical tools, including numerical fluid flow simulations and cell growth modelling approaches for hMSCs, will be presented. In addition, a case study demonstrating the applicability of CFD and kinetic growth modelling for the development of an microcarrier-based hMSC process will be shown.
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Lothert K, Dekevic G, Loewe D, Salzig D, Czermak P, Wolff MW. Upstream and Downstream Processes for Viral Nanoplexes as Vaccines. Methods Mol Biol 2020; 2183:217-248. [PMID: 32959247 DOI: 10.1007/978-1-0716-0795-4_12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
The increasing medical interest in viral nanoplexes, such as viruses or virus-like particles used for vaccines, gene therapy products, or oncolytic agents, raises the need for fast and efficient production processes. In general, these processes comprise upstream and downstream processing. For the upstream process, efficiency is mainly characterized by robustly achieving high titer yields, while reducing process times and costs with regard to the cell culture medium, the host cell selection, and the applied process conditions. The downstream part, on the other hand, should effectively remove process-related contaminants, such as host cells/cell debris as well as host cell DNA and proteins, while maintaining product stability and reducing product losses. This chapter outlines a combination of process steps to successfully produce virus particles in the controlled environment of a stirred tank bioreactor, combined with a platform-based purification approach using filtration-based clarification and steric exclusion chromatography. Additionally, suggestions for off-line analytics in terms of virus characterization and quantification as well as for contaminant estimation are provided.
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Affiliation(s)
- Keven Lothert
- Institute of Bioprocess Engineering and Pharmaceutical Technology (IBPT), Technische Hochschule Mittelhessen (THM) - University of Applied Sciences, Giessen, Germany
| | - Gregor Dekevic
- Institute of Bioprocess Engineering and Pharmaceutical Technology (IBPT), Technische Hochschule Mittelhessen (THM) - University of Applied Sciences, Giessen, Germany
| | - Daniel Loewe
- Institute of Bioprocess Engineering and Pharmaceutical Technology (IBPT), Technische Hochschule Mittelhessen (THM) - University of Applied Sciences, Giessen, Germany
| | - Denise Salzig
- Institute of Bioprocess Engineering and Pharmaceutical Technology (IBPT), Technische Hochschule Mittelhessen (THM) - University of Applied Sciences, Giessen, Germany
| | - Peter Czermak
- Institute of Bioprocess Engineering and Pharmaceutical Technology (IBPT), Technische Hochschule Mittelhessen (THM) - University of Applied Sciences, Giessen, Germany.,Faculty of Biology and Chemistry, Justus-Liebig-University Giessen, Giessen, Germany.,Division Bioresources, Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), Giessen, Germany
| | - Michael W Wolff
- Institute of Bioprocess Engineering and Pharmaceutical Technology (IBPT), Technische Hochschule Mittelhessen (THM) - University of Applied Sciences, Giessen, Germany.
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Buffo MM, Esperança MN, Farinas CS, Badino AC. Relation between pellet fragmentation kinetics and cellulolytic enzymes production by Aspergillus niger in conventional bioreactor with different impellers. Enzyme Microb Technol 2020; 139:109587. [DOI: 10.1016/j.enzmictec.2020.109587] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 04/07/2020] [Accepted: 04/24/2020] [Indexed: 10/24/2022]
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Marigliani B, Balottin LBL, Augusto EDFP. Adaptation of Mammalian Cells to Chemically Defined Media. ACTA ACUST UNITED AC 2020; 82:e88. [PMID: 31756045 DOI: 10.1002/cptx.88] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
In order to circumvent ethical, technical, and economic drawbacks regarding the use of animal serum in cell culturing, it is possible to adapt mammalian cells to serum-free media. Nowadays, there are several serum-free formulations available, including fully animal derived-free and chemically defined media, and different adaptation techniques. This article focuses on the gradual adaptation of a mammalian suspension cell culture to a chemically defined medium. The first step is to transfer the cells cultured in medium supplemented with fetal bovine serum (FBS) to a chemically defined medium of your choice, containing the same amount of FBS. The next steps consist of progressively reducing the amount of FBS, while monitoring cell growth and viability up to the complete elimination of FBS. This protocol has been successfully used to adapt THP-1 cells to a chemically defined medium with similar maximum specific growth rate as those cultured with FBS. © 2019 by John Wiley & Sons, Inc. Basic Protocol: Gradual adaptation to chemically defined medium Alternate Protocol: Direct adaptation to chemically defined medium Support Protocol 1: Determining maximum specific growth rate of a cell culture Support Protocol 2: Cell freezing and thawing.
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Affiliation(s)
- Bianca Marigliani
- PRONAMETRO, National Institute of Metrology, Quality and Technology (INMETRO), Duque de Caxias, Rio de Janeiro, Brazil.,Laboratory of Tissue Bioengineering, Directory of Metrology Applied to Life Sciences, National Institute of Metrology, Quality and Technology (INMETRO), Duque de Caxias, Rio de Janeiro, Brazil
| | - Luciene Bottentuit López Balottin
- Laboratory of Tissue Bioengineering, Directory of Metrology Applied to Life Sciences, National Institute of Metrology, Quality and Technology (INMETRO), Duque de Caxias, Rio de Janeiro, Brazil
| | - Elisabeth de Fatima Pires Augusto
- Department of Science and Technology, Science and Technology Institute, Federal University of São Paulo (UNIFESP), São José dos Campos, São Paulo, Brazil
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Bioreactor Parameters for Microcarrier-Based Human MSC Expansion under Xeno-Free Conditions in a Vertical-Wheel System. Bioengineering (Basel) 2020; 7:bioengineering7030073. [PMID: 32650422 PMCID: PMC7552727 DOI: 10.3390/bioengineering7030073] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 07/02/2020] [Accepted: 07/05/2020] [Indexed: 12/27/2022] Open
Abstract
Human mesenchymal stem/stromal cells (hMSCs) have been investigated and proven to be a well-tolerated, safe therapy for a variety of indications, as shown by over 900 registered hMSC-based clinical trials. To meet the commercial demand for clinical manufacturing of hMSCs, production requires a scale that can achieve a lot size of ~100B cells, which requires innovative manufacturing technologies such as 3D bioreactors. A robust suspension bioreactor process that can be scaled-up to the relevant scale is therefore crucial. In this study, we developed a fed-batch, microcarrier-based bioreactor process, which enhances media productivity and drives a cost-effective and less labor-intensive hMSC expansion process. We determined parameter settings for various stages of the culture: inoculation, bioreactor culture, and harvest. Addition of a bioreactor feed, using a fed-batch approach, was necessary to replenish the mitogenic factors that were depleted from the media within the first 3 days of culture. Our study resulted in an optimized hMSC culture protocol that consistently achieved hMSC densities between 2 × 105–6 × 105 cells/mL within 5 days with no media exchange, maintaining the final cell population doubling level (PDL) at 16–20. Using multiple hMSC donors, we showed that this process was robust and yielded hMSCs that maintained expansion, phenotypic characteristic, and functional properties. The developed process in a vertical-wheel suspension bioreactor can be scaled to the levels needed to meet commercial demand of hMSCs.
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Kazemzadeh A, Elias C, Tamer M, Lohi A, Ein-Mozaffari F. Mass transfer in a single-use angled-shaft aerated stirred bioreactor applicable for animal cell culture. Chem Eng Sci 2020. [DOI: 10.1016/j.ces.2020.115606] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Scargiali F, Brucato A, Micale G, Tamburini A. On the Reduction of Power Consumption in Vortexing Unbaffled Bioslurry Reactors. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c00726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Francesca Scargiali
- Dipartimento di Ingegneria, Università di Palermo, Viale delle Scienze, Ed.6, 90128 Palermo, Italy
| | - Alberto Brucato
- Dipartimento di Ingegneria, Università di Palermo, Viale delle Scienze, Ed.6, 90128 Palermo, Italy
| | - Giorgio Micale
- Dipartimento di Ingegneria, Università di Palermo, Viale delle Scienze, Ed.6, 90128 Palermo, Italy
| | - Alessandro Tamburini
- Dipartimento di Ingegneria, Università di Palermo, Viale delle Scienze, Ed.6, 90128 Palermo, Italy
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Esperança MN, Mendes CE, Rodriguez GY, Cerri MO, Béttega R, Badino AC. Sparger design as key parameter to define shear conditions in pneumatic bioreactors. Biochem Eng J 2020. [DOI: 10.1016/j.bej.2020.107529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Chaudhary G, Luo R, George M, Tescione L, Khetan A, Lin H. Understanding the effect of high gas entrance velocity on Chinese hamster ovary (CHO) cell culture performance and its implications on bioreactor scale-up and sparger design. Biotechnol Bioeng 2020; 117:1684-1695. [PMID: 32086806 DOI: 10.1002/bit.27314] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 01/28/2020] [Accepted: 02/20/2020] [Indexed: 11/10/2022]
Abstract
There are three main potential sources for cell shear damage existing in stirred tank bioreactors. One is the potential high energy dissipation in the immediate impeller zones; another from small gas bubble burst; and third is from high gas entrance velocity (GEV) emitting from the sparger. While the first two have been thoroughly addressed for the scale-up of Chinese hamster ovary (CHO) cell culture knowing that a wide tolerable agitation range with non-damaging energy dissipation exists and the use of shear protectants like Pluronic F68 guard against cell damage caused by bubble burst, GEV remains a potential scale-up problem across scales for the drilled hole or open pipe sparger designs. GEV as high as 170 m/s due to high gas flow rates and relatively small sparger hole diameters was observed to be significantly detrimental to cell culture performance in a 12,000 L bioreactor when compared to a satellite 2 L bioreactor run with GEV of <1 m/s. Small scale study of GEV as high as 265 m/s confirmed this. Based on the results of this study, a critical GEV of >60 m/s for CHO cells is proposed, whereas previously 30 m/s has been reported for NS0 cells by Zhu, Cuenca, Zhou, and Varma (2008. Biotechnol. Bioeng., 101, 751-760). Implementation of new large scale spargers with larger diameter and more holes lowered GEV and helped improve the cell culture performance, closing the scale-up gap. Design of such new spargers was even more critical when hole plugging was discovered during large scale cultivation hence exacerbating the GEV impact. Furthermore, development of a scale down model based on mimicry of the large scale GEV profile as a function of time was proven to be beneficial for reproducing large scale results.
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Affiliation(s)
- Garima Chaudhary
- Cell Culture, Process Science, Boehringer Ingelheim Fremont, Inc., 6701 Kaiser Drive, Fremont, California
| | - Robin Luo
- Cell Culture, Process Science, Boehringer Ingelheim Fremont, Inc., 6701 Kaiser Drive, Fremont, California
| | - Meena George
- Cell Culture, Process Science, Boehringer Ingelheim Fremont, Inc., 6701 Kaiser Drive, Fremont, California
| | - Lia Tescione
- Cell Culture, Process Science, Boehringer Ingelheim Fremont, Inc., 6701 Kaiser Drive, Fremont, California
| | - Anurag Khetan
- Cell Culture, Process Science, Boehringer Ingelheim Fremont, Inc., 6701 Kaiser Drive, Fremont, California
| | - Henry Lin
- Cell Culture, Process Science, Boehringer Ingelheim Fremont, Inc., 6701 Kaiser Drive, Fremont, California
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Marigliani B, Sehn FP, Silva JVMA, Balottin LBL, Augusto EDFP, Buehler AM. The Overt and Hidden Use of Animal-Derived Products in Alternative Methods for Skin Sensitisation: A Systematic Review. Altern Lab Anim 2020; 47:174-195. [PMID: 31902222 DOI: 10.1177/0261192919896361] [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] [Indexed: 12/20/2022]
Abstract
In vitro methods that can replace animal testing in the identification of skin sensitisers are now a reality. However, as cell culture and related techniques usually rely on animal-derived products, these methods may be failing to address the complete replacement of animals in safety assessment. The objective of this study was to identify the animal-derived products that are used as part of in vitro methods for skin sensitisation testing. Thus, a systematic review of 156 articles featuring 83 different in vitro methods was carried out and, from this review, the use of several animal-derived products from different species was identified, with the use of fetal bovine serum being cited in most of the methods (78%). The use of sera from other animals, monoclonal antibodies and animal proteins were also variously mentioned. While non-animal alternatives are available and methods free of animal-derived products are emerging, most of the current methods reported used at least one animal-derived product, which raises ethical and technical concerns. Therefore, to deliver technically and ethically better in vitro methods for the safety assessment of chemicals, more effort should be made to replace products of animal origin in existing methods and to avoid their use in the development of new method protocols.
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Affiliation(s)
- Bianca Marigliani
- Department of Research and Toxicology, Humane Society International (HSI), Washington, DC, USA
| | - Felipe Perraro Sehn
- Department of Oral and Maxillofacial Surgery and Periodontology, Ribeirão Preto Dental School, University of São Paulo (USP), Ribeirão Preto, São Paulo, Brazil
| | | | - Luciene Bottentuit López Balottin
- Laboratory of Tissue Bioengineering, National Institute of Metrology, Quality and Technology (Inmetro), Duque de Caxias, Rio de Janeiro, Brazil
| | - Elisabeth de Fatima Pires Augusto
- Department of Science and Technology, Science and Technology Institute, Federal University of São Paulo (UNIFESP), São José dos Campos, São Paulo, Brazil
| | - Anna Maria Buehler
- Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
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37
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Experiments and finite element modeling of hydrodynamics and mass transfer for continuous gas-to-liquid biocatalysis using a biocomposite falling film reactor. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.115163] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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St-Pierre Lemieux G, Groleau D, Proulx P. Introduction on Foam and its Impact in Bioreactors. CANADIAN JOURNAL OF BIOTECHNOLOGY 2019. [DOI: 10.24870/cjb.2019-000131] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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39
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Hong JK, Yeo HC, Lakshmanan M, Han SH, Cha HM, Han M, Lee DY. In silico model-based characterization of metabolic response to harsh sparging stress in fed-batch CHO cell cultures. J Biotechnol 2019; 308:10-20. [PMID: 31756358 DOI: 10.1016/j.jbiotec.2019.11.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 11/11/2019] [Accepted: 11/19/2019] [Indexed: 12/16/2022]
Abstract
Mammalian cell culture platform has been successfully implemented for industrial biopharmaceutical production through the advancements in early stage process development including cell-line engineering, media design and process optimization. However, late stage developments such as scale-up, scale-down and large-scale cell cultivation still face many industrial challenges to acquire comparable process performance between different culture scales. One of them is the sparging strategy which significantly affects productivity, quality and comparability. Currently, it is mainly relying on the empirical records due to the lack of theoretical framework and scarcity of available literatures to elucidate intracellular metabolic features. Therefore, it is highly required to characterize the underlying mechanism of physiological changes and metabolic states upon the aeration stress. To this end, initially we cultivated antibody producing CHO cells under mild and harsh sparging conditions and observed that sparging stress leads to the decreased cell growth rate, viability and productivity. Subsequent in silicomodel-driven flux analysis suggested that sparging stress rewires amino acid metabolism towards the enriched H2O2 turnover rate by up-regulated fluxes of amino acid oxidases. Interestingly, many of these H2O2-generating reactions were closely connected with the production of NADH, NADPH and GSH which are typical reducing equivalents. Thus, we can hypothesize that increased amino acid uptake caused by sparging stress contributes to restore redox homeostasis against oxidative stress. The current model-driven systematic data analysis allows us to quickly define distinct metabolic feature under stress condition by using basic cell cultivation datasets.
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Affiliation(s)
- Jong Kwang Hong
- Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), 20 Biopolis Way, #06-01, 138668, Singapore
| | - Hock Chuan Yeo
- Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), 20 Biopolis Way, #06-01, 138668, Singapore
| | - Meiyappan Lakshmanan
- Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), 20 Biopolis Way, #06-01, 138668, Singapore
| | - Sung-Hyuk Han
- Upstream process, GC Pharma R&D center, 107 Ihyun-ro, Giheung-gu, Yongin-si, Gyeonggi-do, 16926, Republic of Korea
| | - Hyun Myoung Cha
- Upstream process, GC Pharma R&D center, 107 Ihyun-ro, Giheung-gu, Yongin-si, Gyeonggi-do, 16926, Republic of Korea
| | - Muri Han
- Upstream process, GC Pharma R&D center, 107 Ihyun-ro, Giheung-gu, Yongin-si, Gyeonggi-do, 16926, Republic of Korea
| | - Dong-Yup Lee
- Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), 20 Biopolis Way, #06-01, 138668, Singapore; School of Chemical Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 16419, Republic of Korea.
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Narayanappa AT, Mwilu S, Holdread S, Hammett K, Bu G, Dodson EC, Brooks JW. A rapid cell-based assay for determining poloxamer quality in CHO suspension cell culture. Biotechniques 2019; 67:98-109. [PMID: 31347927 DOI: 10.2144/btn-2019-0070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Poloxamers are water-soluble polymers that are widely used in cell culture bioprocessing to protect cells against shearing forces. Use of poor-quality poloxamers may lead to a drastic reduction in cell growth, viabilities and productivities in cell culture-based manufacturing. In order to evaluate poloxamer quality and promote more consistent performance, a rapid cell membrane adhesion to hydrocarbon assay was developed based on the adhesive properties of cell membranes to selective hydrocarbons. The assay can identify a poor-performing poloxamer characterized by significant drop in viable cell density and percent viability. The assay was verified across multiple good and bad poloxamer lots, and the results were in agreement with established cell growth and high-performance liquid chromatography assays.
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Affiliation(s)
| | - Sam Mwilu
- Advanced Bioprocessing, Thermo Fisher Scientific, 250 Schilling Circle, Hunt Valley, MD 21030, USA
| | - Stacy Holdread
- Advanced Bioprocessing, Thermo Fisher Scientific, 250 Schilling Circle, Hunt Valley, MD 21030, USA
| | - Kimesha Hammett
- Advanced Bioprocessing, Thermo Fisher Scientific, 250 Schilling Circle, Hunt Valley, MD 21030, USA
| | - George Bu
- Advanced Bioprocessing, Thermo Fisher Scientific, 250 Schilling Circle, Hunt Valley, MD 21030, USA
| | - Elizabeth C Dodson
- Advanced Bioprocessing, Thermo Fisher Scientific, 250 Schilling Circle, Hunt Valley, MD 21030, USA
| | - James W Brooks
- Advanced Bioprocessing, Thermo Fisher Scientific, 250 Schilling Circle, Hunt Valley, MD 21030, USA
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Numerical Simulation of Bubble-Liquid Two-Phase Turbulent Flows in Shallow Bioreactor. ENERGIES 2019. [DOI: 10.3390/en12122269] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
An improved second-order moment bubble-liquid two-phase turbulent model is developed to predict the hydrodynamic characteristics of the shallow bioreactor using two height-to-diameter ratios of H/D = 1.4 and H/D = 2.9. The two-phase hydrodynamic parameters, the bubble normal and shear stress, the bubble energy dissipation rate, the bubble turbulent kinetic energy, etc. were numerically simulated. These parameters increased along with flow direction and constituted a threat to cells living at far distance away from the gas jetting inlet regions, rather than a finding of higher cell damage at near the jetting inlet region, as reported by Babosa et al. 2003. A new correlation named the turbulent energy production of bubble-liquid two-phase flow was proposed to successfully verify this experimental observation. A smaller H/D ratio makes more contributions to the generation of lower turbulent energy productions, which are in favor of the alleviation of cell damage. The extremely long and narrow shape of the bioreactor is deteriorative for cell living.
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Grein TA, Loewe D, Dieken H, Weidner T, Salzig D, Czermak P. Aeration and Shear Stress Are Critical Process Parameters for the Production of Oncolytic Measles Virus. Front Bioeng Biotechnol 2019; 7:78. [PMID: 31058145 PMCID: PMC6478815 DOI: 10.3389/fbioe.2019.00078] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Accepted: 03/27/2019] [Indexed: 12/26/2022] Open
Abstract
Oncolytic Measles virus is a promising candidate for cancer treatment, but clinical studies have shown that extremely high doses (up to 1011 TCID50 per dose) are required to effect a cure. Very high titers of the virus must therefore be achieved during production to ensure an adequate supply. We have previously shown that Measles virus can be produced in Vero cells growing on a Cytodex 1 microcarrier in serum-containing medium using a stirred-tank reactor (STR). However, process optimization and further process transfer or scale up requires the identification of critical process parameters, particularly because the use of STRs increases the risk of cell damage and lower product yields due to shear stress. Using a small-scale STR (0.5 L working volume) we found that Measles virus titers are sensitive to agitator-dependent shear, with shear stress ≥0.25 N m-2 reducing the titer by more than four orders of magnitude. This effect was observed in both serum-containing and serum-free medium. At this scale, virus of titers up to 1010 TCID50 mL-1 could be achieved with an average shear stress of 0.1 N m-2. We also found that the aeration method affected the virus titer. Aeration was necessary to ensure a sufficient oxygen supply to the Vero cells, and CO2 was also needed to regulate the pH of the sodium bicarbonate buffer system. Continuous gassing with air and CO2 reduced the virus titer by four orders of magnitude compared to head-space aeration. The manufacture of oncolytic Measles virus in a STR can therefore be defined as a shear-sensitive process, but high titers can nevertheless be achieved by keeping shear stress levels below 0.25 N m-2 and by avoiding extensive gassing of the medium.
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Affiliation(s)
- Tanja A. Grein
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen, Giessen, Germany
| | - Daniel Loewe
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen, Giessen, Germany
| | - Hauke Dieken
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen, Giessen, Germany
| | - Tobias Weidner
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen, Giessen, Germany
| | - Denise Salzig
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen, Giessen, Germany
| | - Peter Czermak
- Institute of Bioprocess Engineering and Pharmaceutical Technology, University of Applied Sciences Mittelhessen, Giessen, Germany
- Faculty of Biology and Chemistry, Justus Liebig University, Giessen, Germany
- Project group Bioresources, Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), Giessen, Germany
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43
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Zheng C, Guo J, Wang C, Chen Y, Zheng H, Yan Z, Chen Q. Experimental study and simulation of a three-phase flow stirred bioreactor. Chin J Chem Eng 2019. [DOI: 10.1016/j.cjche.2018.06.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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44
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Bareford L, Peng H, Ali A, Kolwyck D, Dickens J. Development of a rapid and reliable analytical method for screening poloxamer 188 for use in cell culture process. Biotechnol Prog 2019; 35:e2792. [PMID: 30816019 DOI: 10.1002/btpr.2792] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 01/15/2019] [Accepted: 02/25/2019] [Indexed: 11/12/2022]
Abstract
Poloxamer P188 is a common nonionic surfactant additive used in cell culture media as a cellular protectant from the hydrodynamic forces and shear stress during bioprocessing. Presence of a hydrophobic high molecular weight impurity contaminant has been shown to compromise its protective properties and lead to batch failure. In this work we present, a reliable, sensitive, and rapid analytical method to detect and quantify the contaminant impurity in poloxamer 188. This method replaces a laborious and time-consuming functional test in the form of a shake flask assay. The method is based upon reversed-phase liquid chromatography with charged aerosol detection, simple mobile phase compositions, and a three-step gradient. The method was optimized to resolve the impurity from the main P188 fraction in less than 10 min. Analytical method qualification and functional test comparison demonstrate equivalent or better high throughput impurity screening performance. Attempts to identify the impurity and establish suitable method positive control standards are also discussed.
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Affiliation(s)
| | - Haofan Peng
- Manufacturing Sciences, Biogen, Davis, North Carolina
| | - Amr Ali
- Analytical Development, Biogen, Cambridge, Massachusetts
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45
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Torizal FG, Horiguchi I, Sakai Y. Physiological Microenvironmental Conditions in Different Scalable Culture Systems for Pluripotent Stem Cell Expansion and Differentiation. Open Biomed Eng J 2019. [DOI: 10.2174/1874120701913010041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Human Pluripotent Stem Cells (PSCs) are a valuable cell type that has a wide range of biomedical applications because they can differentiate into many types of adult somatic cell. Numerous studies have examined the clinical applications of PSCs. However, several factors such as bioreactor design, mechanical stress, and the physiological environment have not been optimized. These factors can significantly alter the pluripotency and proliferation properties of the cells, which are important for the mass production of PSCs. Nutritional mass transfer and oxygen transfer must be effectively maintained to obtain a high yield. Various culture systems are currently available for optimum cell propagation by maintaining the physiological conditions necessary for cell cultivation. Each type of culture system using a different configuration with various advantages and disadvantages affecting the mechanical conditions in the bioreactor, such as shear stress. These factors make it difficult to preserve the cellular viability and pluripotency of PSCs. Additional limitations of the culture system for PSCs must also be identified and overcome to maintain the culture conditions and enable large-scale expansion and differentiation of PSCs. This review describes the different physiological conditions in the various culture systems and recent developments in culture technology for PSC expansion and differentiation.
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46
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He C, Ye P, Wang H, Liu X, Li F. A systematic mass-transfer modeling approach for mammalian cell culture bioreactor scale-up. Biochem Eng J 2019. [DOI: 10.1016/j.bej.2018.09.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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47
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Tamburini A, Gagliano G, Micale G, Brucato A, Scargiali F, Ciofalo M. Direct numerical simulations of creeping to early turbulent flow in unbaffled and baffled stirred tanks. Chem Eng Sci 2018. [DOI: 10.1016/j.ces.2018.07.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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48
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Propagation and Molecular Characterization of Bioreactor Adapted Very Virulent Infectious Bursal Disease Virus Isolates of Malaysia. J Pathog 2018; 2018:1068758. [PMID: 30245887 PMCID: PMC6139196 DOI: 10.1155/2018/1068758] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 07/01/2018] [Accepted: 08/01/2018] [Indexed: 12/02/2022] Open
Abstract
Two Malaysian very virulent infectious bursal disease virus (vvIBDV) strains UPM0081 (also known as B00/81) and UPM190 (also known as UPM04/190) isolated from local IBD outbreaks in 2000 and 2004, respectively, were separately passaged for 12 consecutive times in 11-day-old specific pathogen free (SPF) chicken embryonated eggs (CEE) via the chorioallantoic membrane (CAM) route. The CEE passage 8 (EP8) isolates were passaged once in BGM-70 cell line yielding UPM0081EP8BGMP1 and UPM190EP8BGMP1, while the EP12 isolates were passaged 15 times in BGM-70 cell line yielding UPM0081EP12BGMP15 and UPM190EP12BGMP15 using T25 tissue culture flask. These isolates were all propagated once in bioreactor using cytodex 1 as microcarrier at 3 g per liter (3 g/L) yielding UPM0081EP8BGMP1BP1, UPM190EP8BGMP1BP1, UPM0081EP12BGMP15BP1, and UPM190EP12BGMP15BP1 isolates. The viruses were harvested at 3 days after inoculation, following the appearance of cytopathic effects (CPE) characterized by detachment from the microcarrier using standard protocol and filtered using 0.2 μm syringe filter. The filtrates were positive for IBDV by RT-PCR and immunofluorescence. Sequence and phylogenetic tree analysis indicated that the isolates were of the vvIBDV strains and were not different from the flask propagated parental viruses.
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49
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Gas-liquid mass transfer rates in unbaffled tanks stirred by PBT: scale-up effects and pumping direction. Chem Eng Res Des 2018. [DOI: 10.1016/j.cherd.2018.07.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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50
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Guzniczak E, Jimenez M, Irwin M, Otto O, Willoughby N, Bridle H. Impact of poloxamer 188 (Pluronic F-68) additive on cell mechanical properties, quantification by real-time deformability cytometry. BIOMICROFLUIDICS 2018; 12:044118. [PMID: 30867863 PMCID: PMC6404947 DOI: 10.1063/1.5040316] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 08/03/2018] [Indexed: 06/09/2023]
Abstract
Advances in cellular therapies have led to the development of new approaches for cell product purification and formulation, e.g., utilizing cell endogenous properties such as size and deformability as a basis for separation from potentially harmful undesirable by-products. However, commonly used additives such as Pluronic F-68 and other poloxamer macromolecules can change the mechanical properties of cells and consequently alter their processing. In this paper, we quantified the short-term effect of Pluronic F-68 on the mechanotype of three different cell types (Jurkat cells, red blood cells, and human embryonic kidney cells) using real-time deformability cytometry. The impact of the additive concentration was assessed in terms of cell size and deformability. We observed that cells respond progressively to the presence of Pluronic F-68 within first 3 h of incubation and become significantly stiffer (p-value < 0.001) in comparison to a serum-free control and a control containing serum. We also observed that the short-term response manifested as cell stiffening is true (p-value < 0.001) for the concentration reaching 1% (w/v) of the poloxamer additive in tested buffers. Additionally, using flow cytometry, we assessed that changes in cell deformability triggered by addition of Pluronic F-68 are not accompanied by size or viability alterations.
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Affiliation(s)
- Ewa Guzniczak
- Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh Campus, Edinburgh EH14 4AS, United Kingdom
| | - Melanie Jimenez
- School of Engineering, Biomedical Engineering Division, University of Glasgow, Glasgow G12 8LT, United Kingdom
| | - Matthew Irwin
- Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh Campus, Edinburgh EH14 4AS, United Kingdom
| | - Oliver Otto
- ZIK HIKE, Centre for Innovation Competence - Humoral Immune Reactions in Cardiovascular Diseases, Biomechanics, University of Greifswald, Fleischmannstraße 42-44, 17489 Greifswald, Germany
| | - Nicholas Willoughby
- Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh Campus, Edinburgh EH14 4AS, United Kingdom
| | - Helen Bridle
- Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh Campus, Edinburgh EH14 4AS, United Kingdom
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