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Languages : en
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Languages : en
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Author: Niall Barron
Publisher: Springer Science & Business Media
ISBN: 9400751281
Category : Medical
Languages : en
Pages : 126
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Book Description
Focused manuscript on the potential use/role of miRNAs in bioprocessing, specifically the production of complex proteins in mammalian cells. With that in mind I propose a draft list of topics/chapters along the following lines: Intro on CHO/bioprocessing/engineering challenges to set scene, Genomic organization, biogenesis and mode of action, Identifying miRNA targets: Computational prediction, transcriptomics, proteomices, UTR analysis, etc., miRNA expression in Chinese Hamster Ovary cells, miRNAs as engineering targets: pathway manipulation to impact bioprocess phenotypes, miRNAs as biomarkers, Detection methods: Northern, PCR, hybridization arrays, Next Gen Seq, Manipulation of expression in cultured cells: Transient/stable disregulation, Knockout.
Author: Kevin Kellner
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Chinese Hamster Ovary (CHO) cells are the prominent cell line used in biopharmaceutical production. Over 70% of all therapeutically used recombinant proteins are produced by CHO cells with a market size predicted to exceed €250bn by 2021. Their favourable attributes over other cell lines are properties like resistance to viral infections, growth in chemical defined media, human like glycosylation patterns, good productivity and ease of genetic engineering. Due to the complexity of mammalian expression systems yields achieved are not phenomenal by any means. However, compared to 1986 with product concentrations of 50 mg/L, titres up to 10 g/L have been reported recently. Improvement of bioprocesses and media development contributed their part in facilitating higher titres but genetic engineering to improve host cells came to the foreground. MicroRNAs (miRNAs) have hereby been highlighted as attractive targets due to their involvement in processes like viability, secretion, productivity, product quality to mention only a few. MiRNAs are small non-coding RNAs which are about 22 nucleotides in length and were first discovered in the early 90's. A single miRNA can target 100-200 mRNAs which highlights them as key regulators for translational control. The miRNA-23 cluster was first identified as upregulated during induced hypothermic conditions. Hypothermia is a commonly used process to reduce growth and thrive CHO cells to improved productivities. Therefore, we hypothesised involvement of the miR-23 cluster or individual miRNA members in viability and productivity phenotypes. In this work we investigated the depletion of the miR-23 cluster as well as miR-23, miR-24 and miR-27 in a panel of industrially relevant cell lines expressing various recombinant products. In fact, miR-24 was identified as thriver of productivity and growth by upregulating ribosomal biogenesis, assembly of ribosomal subunits, translation as well as unfolded protein response (UPR). This was demonstrated in several cell lines and was not product specific. Furthermore, the depletion of the whole miR-23 cluster as well as miR-27 has been shown to improve productivity although in a cell line specific context. To overcome challenges of sponge technology we also implemented the recently developed CRISPR/Cas9 system to target miRNAs. When phenotypes after sponge and CRISPR/Cas9 mediated depletion of members of the miR-23 cluster were assessed, it was demonstrated that even enhanced properties were exhibited using CRISPR/Cas9 in case of miR-24 and miR-27 regarding productivity and longevity. Furthermore, we implemented a CRISPR/Cas9 library for genome wide recessive knockout screens to identify proteins involved in high productivity phenotypes or are important for survival of stress conditions i.e. hyperosmolality. Mixed populations expressing the sgRNA-library were sorted for high productivity using low temperature stains and were adapted to high salt conditions. Enrichment or depletion of sgRNAs was subsequently analyzed using Next-Generation Sequencing. SgRNA abundance analysed after low temperature stain showed enrichment of distinct populations. Functional annotation of enriched genes showed no evidence in relation to productivity. Exploiting miRNAs and genome-wide knockout studies to improve the bioprocess phenotype highlights these methods as interesting tools for further investigation regarding applications within biopharmaceutical industry.
Author: Ralf Pörtner
Publisher: Springer Nature
ISBN: 3030798712
Category : Medical
Languages : en
Pages : 552
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Book Description
This contributed volume is dedicated towards the progress achieved within the last years in all areas of Cell Culture Engineering and Technology. It comprises contributions of active researchers in the field of cell culture development for the production of recombinant proteins, cell line development, cell therapy and gene therapy, with consideration of media development, process scale-up, reactor design, monitoring and control and model-assisted strategies for process design. The knowledge and expertise of the authors cover disciplines like cell biology, engineering, biotechnology and biomedical sciences. This book is conceived for graduate students, postdoctoral fellows and researchers interested in the latest developments in Cell Engineering.
Author: Ricardo Valdés-Bango Curell
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Improvements in the production capabilities of Chinese Hamster Ovary (CHO) cells have relied on traditional genetic engineering strategies, such as gene overexpression and gene knockouts. However, new strategies are likely to require more sophisticated rational approaches and novel molecular tools need to be developed to facilitate more refined control of gene expression. In this thesis, the use of microRNAs to harness control of transgene expression in CHO cells has been investigated. The first part of this thesis aimed to identify miRNA expression profiles that could be used to actuate transgene expression in the context of biopharmaceutical production. miRNA expression data from cell lines with different glutamine requirements was investigated in an attempt to identify glutamine responsive miRNAs. In addition, the analysis of a novel CHO miRNA expression dataset from a fed batch process resulted in the identification of interesting miRNA clusters exhibiting expression profiles that could be matched to particular growth phases. The second part of the work involved the investigation of temperature-induced miRNA expression changes in order to build a temperature dependent transgene expression control system using miRNA sponges. Temperature responsive miRNAs were identified and validated. While providing evidence that miRNA sponges can be used as molecular sensors and modulate gene expression, our results indicate that temperature-driven changes of miRNA expression are unlikely to be used as a robust gene control system. Finally, transgene expression control by combining UTR secondary structure and miRNAs was investigated. We showed that miRNA-toehold switches are able to repress transgene expression repression in a sequence specific manner although a robust ON/OFF function could not be achieved. Using a small library of synthetic 5'-UTR, the effect of several structural and sequence features in the miRNA-toehold was also investigated. Sequence determinants such as upstream ORFs, AU-rich regions and kozak environment showed greater effects on transgene expression than the 5'-UTR local secondary structure features. In summary, the work described in this thesis represents the first attempt to implement miRNA-based strategies to directly control transgene expression in CHO cells while highlighting the difficulties that need to be overcome for this strategy to be effective.
Author: Wei-Shu Hu
Publisher: Springer
ISBN: 3540340076
Category : Science
Languages : en
Pages : 179
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Book Description
Since the introduction of recombinant human growth hormone and insulin a quarter century ago, protein therapeutics has greatly broadened the ho- zon of health care. Many patients suffering with life-threatening diseases or chronic dysfunctions, which were medically untreatable not long ago, can attest to the wonder these drugs have achieved. Although the ?rst generation of p- tein therapeutics was produced in recombinant Escherichia coli, most recent products use mammalian cells as production hosts. Not long after the ?rst p- duction of recombinant proteins in E. coli, it was realized that the complex tasks of most post-translational modi?cations on proteins could only be ef?ciently carried out in mammalian cells. In the 1990s, we witnessed a rapid expansion of mammalian-cell-derived protein therapeutics, chie?y antibodies. In fact, it has been nearly a decade since the market value of mammalian-cell-derived protein therapeutics surpassed that of those produced from E. coli. A common characteristic of recent antibody products is the relatively large dose required for effective therapy, demanding larger quantities for the treatment of a given disease. This, coupled with the broadening repertoire of protein drugs, has rapidly expanded the quantity needed for clinical applications. The increasing demand for protein therapeutics has not been met exclusively by construction of new manufacturing plants and increasing total volume capacity. More - portantly the productivity of cell culture processes has been driven upward by an order of magnitude in the past decade.
Author: Gunter Jagschies
Publisher: Elsevier
ISBN: 0128125527
Category : Technology & Engineering
Languages : en
Pages : 1310
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Book Description
Biopharmaceutical Processing: Development, Design, and Implementation of Manufacturing Processes covers bioprocessing from cell line development to bulk drug substances. The methods and strategies described are essential learning for every scientist, engineer or manager in the biopharmaceutical and vaccines industry. The integrity of the bioprocess ultimately determines the quality of the product in the biotherapeutics arena, and this book covers every stage including all technologies related to downstream purification and upstream processing fields. Economic considerations are included throughout, with recommendations for lowering costs and improving efficiencies. Designed for quick reference and easy accessibility of facts, calculations and guidelines, this book is an essential tool for industrial scientists and managers in the biopharmaceutical industry. Offers a comprehensive, go-to reference for daily work decisions Covers both upstream and downstream processes Includes case studies that emphasize financial outcomes Presents summaries, decision grids, graphs and overviews for quick reference
Author: Mohamed Al-Rubeai
Publisher: Springer Science & Business Media
ISBN: 0585379718
Category : Science
Languages : en
Pages : 311
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Book Description
Integrating advances in molecular biology into bioprocesses presents a continuous challenge to scientists and bioengineers. This series is conceived to help meet this challenge. It examines and assesses the feasibility of new approaches for the modification of cellular function such as gene expression, protein processing, secretion, glycosylation, immortalisation, proliferation, and apoptosis as well as the systematic study of the metabolic genotype-phenotype relationship. The series provides detailed coverage of the methodology for improving cellular properties of cells used in the production of biopharmaceuticals, gene and cell therapies and tissue engineering. It also seeks to explain the cellular mechanisms underlying in vitro physiological activity and productivity. This volume, which is based on presentations at the `European Workshop on Animal Cell Engineering' held in Costa Brava, Spain, contains a collection of chapters relating to cellular function and modification by leading authorities in several different areas of basic research and the biopharmaceutical industry.
Author: Gyun Min Lee
Publisher: John Wiley & Sons
ISBN: 3527343342
Category : Science
Languages : en
Pages : 436
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Book Description
Offers a comprehensive overview of cell culture engineering, providing insight into cell engineering, systems biology approaches and processing technology In Cell Culture Engineering: Recombinant Protein Production, editors Gyun Min Lee and Helene Faustrup Kildegaard assemble top class authors to present expert coverage of topics such as: cell line development for therapeutic protein production; development of a transient gene expression upstream platform; and CHO synthetic biology. They provide readers with everything they need to know about enhancing product and bioprocess attributes using genome-scale models of CHO metabolism; omics data and mammalian systems biotechnology; perfusion culture; and much more. This all-new, up-to-date reference covers all of the important aspects of cell culture engineering, including cell engineering, system biology approaches, and processing technology. It describes the challenges in cell line development and cell engineering, e.g. via gene editing tools like CRISPR/Cas9 and with the aim to engineer glycosylation patterns. Furthermore, it gives an overview about synthetic biology approaches applied to cell culture engineering and elaborates the use of CHO cells as common cell line for protein production. In addition, the book discusses the most important aspects of production processes, including cell culture media, batch, fed-batch, and perfusion processes as well as process analytical technology, quality by design, and scale down models. -Covers key elements of cell culture engineering applied to the production of recombinant proteins for therapeutic use -Focuses on mammalian and animal cells to help highlight synthetic and systems biology approaches to cell culture engineering, exemplified by the widely used CHO cell line -Part of the renowned "Advanced Biotechnology" book series Cell Culture Engineering: Recombinant Protein Production will appeal to biotechnologists, bioengineers, life scientists, chemical engineers, and PhD students in the life sciences.
Author: Mohamed Al-Rubeai
Publisher: Springer Science & Business Media
ISBN: 9048122457
Category : Medical
Languages : en
Pages : 259
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Book Description
Mammalian cell lines command an effective monopoly for the production of therapeutic proteins that require post-translational modifications. This unique advantage outweighs the costs associated with mammalian cell culture, which are far grater in terms of development time and manufacturing when compared to microbial culture. The development of cell lines has undergone several advances over the years, essentially to meet the requirement to cut the time and costs associated with using such a complex hosts as production platforms. This book provides a comprehensive guide to the methodology involved in the development of cell lines and the cell engineering approach that can be employed to enhance productivity, improve cell function, glycosylation and secretion and control apoptosis. It presents an overall picture of the current topics central to expression engineering including such topics as epigenetics and the use of technologies to overcome positional dependent inactivation, the use of promoter and enhancer sequences for expression of various transgenes, site directed engineering of defined chromosomal sites, and examination of the role of eukaryotic nucleus as the controller of expression of genes that are introduced for production of a desired product. It includes a review of selection methods for high producers and an application developed by a major biopharmaceutical industry to expedite the cell line development process. The potential of cell engineering approch to enhance cell lines through the manipulation of single genes that play important roles in key metabolic and regulatory pathways is also explored throughout.
