1
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Yang CH, Li HC, Lo SY. Enhancing recombinant antibody yield in Chinese hamster ovary cells. Tzu Chi Med J 2024; 36:240-250. [PMID: 38993821 PMCID: PMC11236083 DOI: 10.4103/tcmj.tcmj_315_23] [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: 12/17/2023] [Revised: 03/18/2024] [Accepted: 04/12/2024] [Indexed: 07/13/2024] Open
Abstract
A range of recombinant monoclonal antibodies (rMAbs) have found application in treating diverse diseases, spanning various cancers and immune system disorders. Chinese hamster ovary (CHO) cells have emerged as the predominant choice for producing these rMAbs due to their robustness, ease of transfection, and capacity for posttranslational modifications akin to those in human cells. Transient transfection and/or stable expression could be conducted to express rMAbs in CHO cells. To bolster the yield of rMAbs in CHO cells, a multitude of approaches have been developed, encompassing vector optimization, medium formulation, cultivation parameters, and cell engineering. This review succinctly outlines these methodologies when also addressing challenges encountered in the production process, such as issues with aggregation and fucosylation.
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Affiliation(s)
- Chee-Hing Yang
- Department of Microbiology and Immunology, School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Hui-Chun Li
- Department of Biochemistry, School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Shih-Yen Lo
- Department of Laboratory Medicine and Biotechnology, Tzu Chi University, Hualien, Taiwan
- Department of Laboratory Medicine, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical, Hualien, Taiwan
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2
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Gulyak EL, Alferova VA, Korshun VA, Sapozhnikova KA. Introduction of Carbonyl Groups into Antibodies. Molecules 2023; 28:7890. [PMID: 38067618 PMCID: PMC10707781 DOI: 10.3390/molecules28237890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 11/26/2023] [Accepted: 11/29/2023] [Indexed: 12/18/2023] Open
Abstract
Antibodies and their derivatives (scFv, Fabs, etc.) represent a unique class of biomolecules that combine selectivity with the ability to target drug delivery. Currently, one of the most promising endeavors in this field is the development of molecular diagnostic tools and antibody-based therapeutic agents, including antibody-drug conjugates (ADCs). To meet this challenge, it is imperative to advance methods for modifying antibodies. A particularly promising strategy involves the introduction of carbonyl groups into the antibody that are amenable to further modification by biorthogonal reactions, namely aliphatic, aromatic, and α-oxo aldehydes, as well as aliphatic and aryl-alkyl ketones. In this review, we summarize the preparation methods and applications of site-specific antibody conjugates that are synthesized using this approach.
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Affiliation(s)
| | | | | | - Ksenia A. Sapozhnikova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia; (E.L.G.); (V.A.A.); (V.A.K.)
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3
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Chen Y, Wang K, Zhang S. OPN enhances sperm capacitation and in vitro fertilization efficiency
in boars. JOURNAL OF ANIMAL SCIENCE AND TECHNOLOGY 2022; 64:235-246. [PMID: 35530410 PMCID: PMC9039945 DOI: 10.5187/jast.2022.e15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 02/05/2022] [Accepted: 02/23/2022] [Indexed: 11/20/2022]
Affiliation(s)
- Yun Chen
- Henry Fok College of Biology and
Agriculture, Shaoguan University, Shaoguan 512000, China
| | - Kai Wang
- National Engineering Research Center for
Breeding Swine Industry, Guangdong Provincial Key Lab of Agro-Animal
Genomics and Molecular Breeding, College of Animal Science, South China
Agricultural University, Guangzhou 510642, China
| | - Shouquan Zhang
- National Engineering Research Center for
Breeding Swine Industry, Guangdong Provincial Key Lab of Agro-Animal
Genomics and Molecular Breeding, College of Animal Science, South China
Agricultural University, Guangzhou 510642, China
- Corresponding author: Shouquan Zhang, National
Engineering Research Center for Breeding Swine Industry, Guangdong Provincial
Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal
Science, South China Agricultural University, Guangzhou 510642, China. Tel:
+86-1350-020-8849, E-mail:
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4
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Polymethylmethacrylate Copolymer-Based Microcarriers for Culturing Mammalian Cells. J Pharm Innov 2021. [DOI: 10.1007/s12247-020-09532-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Kaneyoshi K, Yamano-Adachi N, Koga Y, Uchiyama K, Omasa T. Analysis of the immunoglobulin G (IgG) secretion efficiency in recombinant Chinese hamster ovary (CHO) cells by using Citrine-fusion IgG. Cytotechnology 2019; 71:193-207. [PMID: 30610509 PMCID: PMC6368511 DOI: 10.1007/s10616-018-0276-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2018] [Accepted: 11/02/2018] [Indexed: 12/14/2022] Open
Abstract
Biopharmaceuticals represented by immunoglobulin G (IgG) are produced by the cultivation of recombinant animal cells, especially Chinese hamster ovary (CHO) cells. It is thought that the intracellular secretion process of IgG is a bottleneck in the production of biopharmaceuticals. Many studies on the regulation of endogenous secretory protein expression levels have shown improved productivity. However, these strategies have not universally improved the productivity of various proteins. A more rational and efficient establishment of high producer cells is required based on an understanding of the secretory processes in IgG producing CHO cells. In this study, a CHO cell line producing humanized IgG1, which was genetically fused with fluorescent proteins, was established to directly analyze intracellular secretion. The relationship between the amount of intracellular and secreted IgG was analyzed at the single cell level by an automated single-cell analysis and isolation system equipped with dual color fluorescent filters. The amounts of intracellular and secreted IgG showed a weak positive correlation. The amount of secreted IgG analyzed by the system showed a weak negative linear correlation with the specific growth of isolated clones. An immunofluorescent microscopy study showed that the established clones could be used to analyze the intracellular secretion bottleneck. This is the first study to report the use of fluorescent protein fusion IgG as a tool to analyze the secretion of recombinant CHO cells.
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Affiliation(s)
- Kohei Kaneyoshi
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 5650871, Japan
| | - Noriko Yamano-Adachi
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 5650871, Japan
- Manufacturing Technology Association of Biologics, 7-1-49 Minatojima-Minamimachi, Kobe, Hyogo, 6500047, Japan
| | - Yuichi Koga
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 5650871, Japan
| | - Keiji Uchiyama
- The Institute for Enzyme Research, Tokushima University, 3-18-15 Kuramoto, Tokushima, Tokushima, 7708503, Japan
| | - Takeshi Omasa
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 5650871, Japan.
- Manufacturing Technology Association of Biologics, 7-1-49 Minatojima-Minamimachi, Kobe, Hyogo, 6500047, Japan.
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6
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Lengthening of high-yield production levels of monoclonal antibody-producing Chinese hamster ovary cells by downregulation of breast cancer 1. J Biosci Bioeng 2017; 123:382-389. [DOI: 10.1016/j.jbiosc.2016.09.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 09/12/2016] [Accepted: 09/13/2016] [Indexed: 11/19/2022]
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7
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Yamano N, Takahashi M, Ali Haghparast SM, Onitsuka M, Kumamoto T, Frank J, Omasa T. Increased recombinant protein production owing to expanded opportunities for vector integration in high chromosome number Chinese hamster ovary cells. J Biosci Bioeng 2016; 122:226-31. [DOI: 10.1016/j.jbiosc.2016.01.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 12/28/2015] [Accepted: 01/05/2016] [Indexed: 10/22/2022]
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8
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Matsuyama R, Tsutsui T, Lee KH, Onitsuka M, Omasa T. Improved gene amplification by cell-cycle engineering combined with the Cre-loxP system in Chinese hamster ovary cells. J Biosci Bioeng 2015; 120:701-8. [DOI: 10.1016/j.jbiosc.2015.04.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 04/07/2015] [Accepted: 04/14/2015] [Indexed: 10/23/2022]
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9
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Harvey DJ. Analysis of carbohydrates and glycoconjugates by matrix-assisted laser desorption/ionization mass spectrometry: an update for 2009-2010. MASS SPECTROMETRY REVIEWS 2015; 34:268-422. [PMID: 24863367 PMCID: PMC7168572 DOI: 10.1002/mas.21411] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Revised: 07/16/2013] [Accepted: 07/16/2013] [Indexed: 05/07/2023]
Abstract
This review is the sixth update of the original article published in 1999 on the application of MALDI mass spectrometry to the analysis of carbohydrates and glycoconjugates and brings coverage of the literature to the end of 2010. General aspects such as theory of the MALDI process, matrices, derivatization, MALDI imaging, arrays and fragmentation are covered in the first part of the review and applications to various structural typed constitutes the remainder. The main groups of compound that are discussed in this section are oligo and polysaccharides, glycoproteins, glycolipids, glycosides and biopharmaceuticals. Many of these applications are presented in tabular form. Also discussed are medical and industrial applications of the technique, studies of enzyme reactions and applications to chemical synthesis.
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Affiliation(s)
- David J. Harvey
- Department of BiochemistryOxford Glycobiology InstituteUniversity of OxfordOxfordOX1 3QUUK
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10
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Trehalose suppresses antibody aggregation during the culture of Chinese hamster ovary cells. J Biosci Bioeng 2014; 117:632-8. [DOI: 10.1016/j.jbiosc.2013.10.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 10/28/2013] [Accepted: 10/29/2013] [Indexed: 01/22/2023]
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11
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Onitsuka M, Kawaguchi A, Asano R, Kumagai I, Honda K, Ohtake H, Omasa T. Glycosylation analysis of an aggregated antibody produced by Chinese hamster ovary cells in bioreactor culture. J Biosci Bioeng 2014; 117:639-44. [DOI: 10.1016/j.jbiosc.2013.11.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Revised: 10/28/2013] [Accepted: 11/01/2013] [Indexed: 10/25/2022]
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12
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St. Amand MM, Ogunnaike BA, Robinson A. Development of at-line assay to monitor charge variants of MAbs during production. Biotechnol Prog 2013; 30:249-55. [DOI: 10.1002/btpr.1848] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Revised: 12/10/2013] [Indexed: 12/14/2022]
Affiliation(s)
- M. M. St. Amand
- Dept. of Chemical and Biomolecular Engineering; University of Delaware; Newark DE 19716
| | - B. A. Ogunnaike
- Dept. of Chemical and Biomolecular Engineering; University of Delaware; Newark DE 19716
| | - A.S. Robinson
- Dept. of Chemical and Biomolecular Engineering; University of Delaware; Newark DE 19716
- Dept. of Chemical and Biomolecular Engineering; Tulane University; New Orleans LA 70118
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13
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Cation exchange versus multimodal cation exchange resins for antibody capture from CHO supernatants: Identification of contaminating Host Cell Proteins by mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2013; 942-943:126-33. [DOI: 10.1016/j.jchromb.2013.10.033] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Revised: 09/23/2013] [Accepted: 10/20/2013] [Indexed: 12/26/2022]
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14
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Overexpression of mutant cell division cycle 25 homolog B (CDC25B) enhances the efficiency of selection in Chinese hamster ovary cells. Cytotechnology 2013; 65:1017-26. [PMID: 24248275 DOI: 10.1007/s10616-013-9662-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Accepted: 10/18/2013] [Indexed: 10/26/2022] Open
Abstract
The effects of mutant cell division cycle 25 homolog B (CDC25B) overexpression on the generation of cells producing a monoclonal antibody were investigated in Chinese hamster ovary (CHO) cells. Mutant CDC25B (m-CDC25B) expression plasmids were transfected into CHO DG44-derived cells producing a monoclonal antibody, and the frequency of highly producing cells was assessed following gene amplification in the presence of 250 nM methotrexate. Most of the clones obtained from the m-CDC25B-overexpressing cells had higher antibody titers than did mock-transfected control cells. This arose from either higher transgene copy numbers or higher mRNA expression levels for the antibody. However, the high mRNA expression levels were not always accompanied by increases in transgene copy numbers. Our results suggest that cells producing high levels of a monoclonal antibody can be selected efficiently using m-CDC25B overexpression.
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15
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Haredy AM, Nishizawa A, Honda K, Ohya T, Ohtake H, Omasa T. Improved antibody production in Chinese hamster ovary cells by ATF4 overexpression. Cytotechnology 2013; 65:993-1002. [PMID: 24026344 DOI: 10.1007/s10616-013-9631-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2013] [Accepted: 08/10/2013] [Indexed: 12/11/2022] Open
Abstract
To improve antibody production in Chinese hamster ovary (CHO) cells, the humanized antibody-producing CHO DP-12-SF cell line was transfected with the gene encoding activating transcription factor 4 (ATF4), a central factor in the unfolded protein response. Overexpression of ATF4 significantly enhanced the production of antibody in the CHO DP-12-SF cell line. The specific IgG production rate of in the ATF4-overexpressing CHO-ATF4-16 cells was approximately 2.4 times that of the parental host cell line. Clone CHO-ATF4-16 did not show any change in growth rate compared with the parental cells or mock-transfected CHO-DP12-SF cells. The expression levels of mRNAs encoding both the antibody heavy and light chains in the CHO-ATF4-16 clone were analyzed. This analysis showed that ATF4 overexpression improved the total production and specific production rate of antibody without affecting the mRNA transcription level. These results indicate that ATF4 overexpression is a promising method for improving recombinant IgG production in CHO cells.
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Affiliation(s)
- Ahmad M Haredy
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan
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16
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Lee KH, Onitsuka M, Honda K, Ohtake H, Omasa T. Rapid construction of transgene-amplified CHO cell lines by cell cycle checkpoint engineering. Appl Microbiol Biotechnol 2013; 97:5731-41. [DOI: 10.1007/s00253-013-4923-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 04/07/2013] [Accepted: 04/10/2013] [Indexed: 01/02/2023]
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17
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Chen S, Lu C, Gu H, Mehta A, Li J, Romano PB, Horn D, Hooper DC, Bazemore-Walker CR, Block T. Aleuria Aurantia Lectin (AAL)-reactive immunoglobulin G rapidly appears in sera of animals following antigen exposure. PLoS One 2012; 7:e44422. [PMID: 23024749 PMCID: PMC3443102 DOI: 10.1371/journal.pone.0044422] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2012] [Accepted: 08/06/2012] [Indexed: 02/04/2023] Open
Abstract
We have discovered an Aleuria Aurantia Lectin (AAL)-reactive immunoglobulin G (IgG) that naturally occurs in the circulation of rabbits and mice, following immune responses induced by various foreign antigens. AAL can specifically bind to fucose moieties on glycoproteins. However, most serum IgGs are poorly bound by AAL unless they are denatured or treated with glycosidase. In this study, using an immunogen-independent AAL-antibody microarray assay that we developed, we detected AAL-reactive IgG in the sera of all animals that had been immunized 1–2 weeks previously with various immunogens with and without adjuvants and developed immunogen-specific responses. All of these animals subsequently developed immunogen-specific immune responses. The kinetics of the production of AAL-reactive IgG in mice and rabbits were distinct from those of the immunogen-specific IgGs elicited in the same animals: they rose and fell within one to two weeks, and peaked between four to seven days after exposure, while immunogen-specific IgGs continued to rise during the same period. Mass spectrometric profiling of the Fc glycoforms of purified AAL-reactive IgGs indicates that these are mainly comprised of IgGs with core-fucosylated and either mono-or non-galactosylated Fc N-glycan structures. Our results suggest that AAL-reactive IgG could be a previously unrecognized IgG subset that is selectively produced at the onset of a humoral response.
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Affiliation(s)
- Songming Chen
- Institute for Hepatitis and Virus Research, Doylestown, Pennsylvania, United States of America
- * E-mail: (SC); (TB)
| | - Chen Lu
- Institute for Hepatitis and Virus Research, Doylestown, Pennsylvania, United States of America
| | - Hongbo Gu
- Department of Chemistry, Brown University, Providence, Rhode Island, United States of America
| | - Anand Mehta
- Drexel University College of Medicine, Doylestown, Pennsylvania, United States of America
| | - Jianwei Li
- Departments of Cancer Biology and Neurological Surgery, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - Patrick B. Romano
- Drexel University College of Medicine, Doylestown, Pennsylvania, United States of America
| | - David Horn
- Institute for Hepatitis and Virus Research, Doylestown, Pennsylvania, United States of America
| | - D. Craig Hooper
- Departments of Cancer Biology and Neurological Surgery, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | | | - Timothy Block
- Institute for Hepatitis and Virus Research, Doylestown, Pennsylvania, United States of America
- Drexel University College of Medicine, Doylestown, Pennsylvania, United States of America
- * E-mail: (SC); (TB)
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Fornelli L, Damoc E, Thomas PM, Kelleher NL, Aizikov K, Denisov E, Makarov A, Tsybin YO. Analysis of intact monoclonal antibody IgG1 by electron transfer dissociation Orbitrap FTMS. Mol Cell Proteomics 2012; 11:1758-67. [PMID: 22964222 DOI: 10.1074/mcp.m112.019620] [Citation(s) in RCA: 116] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The primary structural information of proteins employed as biotherapeutics is essential if one wishes to understand their structure-function relationship, as well as in the rational design of new therapeutics and for quality control. Given both the large size (around 150 kDa) and the structural complexity of intact immunoglobulin G (IgG), which includes a variable number of disulfide bridges, its extensive fragmentation and subsequent sequence determination by means of tandem mass spectrometry (MS) are challenging. Here, we applied electron transfer dissociation (ETD), implemented on a hybrid Orbitrap Fourier transform mass spectrometer (FTMS), to analyze a commercial recombinant IgG in a liquid chromatography (LC)-tandem mass spectrometry (MS/MS) top-down experiment. The lack of sensitivity typically observed during the top-down MS of large proteins was addressed by averaging time-domain transients recorded in different LC-MS/MS experiments before performing Fourier transform signal processing. The results demonstrate that an improved signal-to-noise ratio, along with the higher resolution and mass accuracy provided by Orbitrap FTMS (relative to previous applications of top-down ETD-based proteomics on IgG), is essential for comprehensive analysis. Specifically, ETD on Orbitrap FTMS produced about 33% sequence coverage of an intact IgG, signifying an almost 2-fold increase in IgG sequence coverage relative to prior ETD-based analysis of intact monoclonal antibodies of a similar subclass. These results suggest the potential application of the developed methodology to other classes of large proteins and biomolecules.
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Affiliation(s)
- Luca Fornelli
- Biomolecular Mass Spectrometry Laboratory, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
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19
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Haredy AM, Nishizawa A, Honda K, Ohya T, Ohtake H, Omasa T. ATF4 over-expression increased IgG1 productivity in Chinese hamster ovary cells. BMC Proc 2012; 5 Suppl 8:O11. [PMID: 22373151 PMCID: PMC3284932 DOI: 10.1186/1753-6561-5-s8-o11] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Ahmad M Haredy
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Akitoshi Nishizawa
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Kohsuke Honda
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Tomoshi Ohya
- Tanabe Mitsubishi Pharma, Hirakata, Osaka, Japan, 573-1153
| | - Hisao Ohtake
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Takeshi Omasa
- Department of Biotechnology, Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan ; Institute of Technology and Science, The University of Tokushima, Tokushima, 770-8506, Japan
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20
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Onitsuka M, Kim WD, Ozaki H, Kawaguchi A, Honda K, Kajiura H, Fujiyama K, Asano R, Kumagai I, Ohtake H, Omasa T. Enhancement of sialylation on humanized IgG-like bispecific antibody by overexpression of α2,6-sialyltransferase derived from Chinese hamster ovary cells. Appl Microbiol Biotechnol 2011; 94:69-80. [DOI: 10.1007/s00253-011-3814-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Revised: 11/28/2011] [Accepted: 12/01/2011] [Indexed: 11/28/2022]
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21
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Cao Y, Kimura S, Itoi T, Honda K, Ohtake H, Omasa T. Fluorescence in situ hybridization using bacterial artificial chromosome (BAC) clones for the analysis of chromosome rearrangement in Chinese hamster ovary cells. Methods 2011; 56:418-23. [PMID: 22100493 DOI: 10.1016/j.ymeth.2011.11.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Revised: 11/01/2011] [Accepted: 11/02/2011] [Indexed: 11/25/2022] Open
Abstract
Chromosome identification using Chinese hamster ovary (CHO) genomic bacterial artificial chromosome (BAC) clones has the potential to contribute to the analysis and understanding of chromosomal instability of CHO cell lines and to improve our understanding of chromosome organization during the establishment of recombinant CHO cells. Fluorescence in situ hybridization imaging using BAC clones as probes (BAC-FISH) can provide valuable information for the identification of chromosomes. In this study, we identified chromosomes and analyzed the chromosome rearrangement in CHO cells using BAC-FISH methods.
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Affiliation(s)
- Yihua Cao
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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