Takeshi Ōmasa

ORCID: 0000-0003-0635-3862
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About
Contact & Profiles
Research Areas
  • Viral Infectious Diseases and Gene Expression in Insects
  • Monoclonal and Polyclonal Antibodies Research
  • Protein purification and stability
  • CRISPR and Genetic Engineering
  • Microbial Metabolic Engineering and Bioproduction
  • Virus-based gene therapy research
  • Glycosylation and Glycoproteins Research
  • Liver physiology and pathology
  • Pancreatic function and diabetes
  • Transgenic Plants and Applications
  • Enzyme Catalysis and Immobilization
  • Animal Genetics and Reproduction
  • Clinical Nutrition and Gastroenterology
  • Biofuel production and bioconversion
  • Organ Transplantation Techniques and Outcomes
  • RNA Interference and Gene Delivery
  • Endoplasmic Reticulum Stress and Disease
  • CAR-T cell therapy research
  • Animal Virus Infections Studies
  • 3D Printing in Biomedical Research
  • Advanced Biosensing Techniques and Applications
  • Bacterial Genetics and Biotechnology
  • Biopolymer Synthesis and Applications
  • Amino Acid Enzymes and Metabolism
  • RNA and protein synthesis mechanisms

Osaka University
2016-2025

KM Biologics (Japan)
2024

Cell Biotech (South Korea)
2023

Biocat
2023

US Biologic (United States)
2016-2022

Tokushima University
2011-2020

Institute of Engineering Science
2014

National Center For Child Health and Development
2012

Tohoku University
2003

Suita Municipal Hospital
2003

Abstract To investigate the effects of lactate on cell growth and antibody production, a new method maintaining concentration constant in fed‐batch culture is described. When pH was initially adjusted by sodium hydroxide, specific rate decreased death increased with an increase concentration. whether inhibition due to itself or osmotic pressure, effect pressure chloride compared that lactate. same condition as using chloride, data showed degree inhibition. It thus evident mainly while...

10.1002/bit.260390511 article EN Biotechnology and Bioengineering 1992-03-05

Abstract Background The integration of biotechnology into chemical manufacturing has been recognized as a key technology to build sustainable society. However, the practical applications biocatalytic conversions are often restricted due their complexities involving unpredictability product yield and troublesome controls in fermentation processes. One possible strategies overcome these limitations is eliminate use living microorganisms only enzymes involved metabolic pathway. Use recombinant...

10.1186/1475-2859-11-120 article EN cc-by Microbial Cell Factories 2012-09-06

Abstract To improve the production of recombinant human antithrombin III (AT‐III) in Chinese hamster ovary (CHO) cells, genes encoding transcription factors, ATF4 (activating factor 4) and XBP‐1s (the spliced form X‐box binding protein 1), which were involved mammalian unfolded response (UPR), cloned from CHO‐K1 cells. Overexpression significantly enhanced AT‐III CHO 13D‐35D The specific rate ATF4‐overexpressed cells reached approximately 23 pg/cell/day. After 144 h incubation, concentration...

10.1002/bit.21758 article EN Biotechnology and Bioengineering 2007-12-13

Chinese hamster ovary (CHO) cells have frequently been used in biotechnology for many years as a mammalian host cell platform cloning and expressing genes of interest. A detailed physical chromosomal map the CHO DG44 line was constructed by fluorescence situ hybridization (FISH) imaging using randomly selected 303 BAC clones probes (BAC-FISH). The two longest chromosomes were completely paired chromosomes; other partly deleted or rearranged. end sequences 624 clones, including 287 mapped...

10.1002/bit.24347 article EN Biotechnology and Bioengineering 2011-10-19

Abstract Most cells active in the immune system express receptors for antibodies which mediate a variety of defensive mechanisms. These interact with Fc portion antibody and are therefore collectively called receptors. Here, using high-speed atomic force microscopy, we observe interactions human, humanized, mouse/human-chimeric immunoglobulin G1 (IgG1) their cognate receptor, FcγRIIIa. Our results demonstrate that not only but also Fab positively contributes to interaction receptor....

10.1038/s41598-019-48323-w article EN cc-by Scientific Reports 2019-08-16

Studies of recombinant adeno-associated virus (rAAV) revealed the mixture full particles with different densities in rAAV. There are no conclusive results because lack quantitative stoichiometric viral proteins, encapsidated DNA, and particle level analyses. We report first comprehensive characterization low- high-density rAAV serotype 2 particles. Capillary gel electrophoresis showed possessing a designed DNA capsid composed (VP1 + VP2)/VP3 = 0.27, whereas low-density have same but...

10.1016/j.omtm.2023.101142 article EN cc-by Molecular Therapy — Methods & Clinical Development 2023-10-24

Genomics-based safety and quality evaluation studies are advancing the bioindustry by enhancing various aspects, including viral safety, host cell protein (HCP) control, product heterogeneity cellular process reproducibility. High-throughput instruments genome-scale databases essential in genomics, with reference genome sequence being most critical database. The completeness accuracy of these sequences depend on DNA quality, sequencing instruments, read coverage, assembly strategies....

10.1101/2025.02.14.638017 preprint EN cc-by bioRxiv (Cold Spring Harbor Laboratory) 2025-02-17

Previously, we established an easy and quick construction method for obtaining a stable highly productive gene-amplified recombinant Chinese hamster ovary (CHO) cell line. With gradual increase in methotrexate (MTX) concentration, pools had high specific growth production rates. Moreover, the phenotype of cells seemed to be affected by location amplified gene chromosomal DNA. We suspected that various kinds might appear during long-term selection construct pools. To clarify behavior stepwise...

10.1021/bp000114e article EN Biotechnology Progress 2000-10-06

The purpose of this study was to evaluate and compare the osteoblastic differentiation ability dedifferentiated fat (DFAT) cells adipose stem (ASCs) from buccal pad (BFP).We isolated human DFAT ASCs BFP a patient who underwent oral maxillofacial surgery then analyzed their cell surface antigens by flow cytometry. Then, were cultured in osteogenic medium for 14 days. Measurement bone-specific alkaline phosphatase (BAP), osteocalcin (OCN), calcium deposition alizarin red staining performed...

10.1007/s00784-013-1166-1 article EN cc-by Clinical Oral Investigations 2013-12-20

10.1016/s1389-1723(02)80201-8 article EN Journal of Bioscience and Bioengineering 2002-12-01

Abstract The NfxC‐type mutant of Pseudomonas aeruginosa produces the MexEF‐OprN efflux pump and down‐regulates expression quorum‐sensing‐dependent MexAB‐OprM production virulence factors in presence an active transcriptional regulator, MexT. Consequently, these cells are resistant to chloramphenicol hypersusceptible β‐lactam antibiotics. An upper negative MexS, has been assumed inactivate MexT wild‐type strains, hence shutting down pump. This observation was, however, reported only one...

10.1111/1348-0421.12032 article EN Microbiology and Immunology 2013-04-01
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