• Title/Summary/Keyword: Monoclonal Antibody

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Characterization of a Monoclonal Antibody Specific to Human Siah-1 Interacting Protein (인체 SIP 단백질에 특이적인 단일클론 항체의 특성)

  • Yoon, Sun Young;Joo, Jong Hyuck;Kim, Joo Heon;Kang, Ho Bum;Kim, Jin Sook;Lee, Younghee;Kwon, Do Hwan;Kim, Chang Nam;Choe, In Seong;Kim, Jae Wha
    • IMMUNE NETWORK
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    • v.4 no.1
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    • pp.23-30
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    • 2004
  • Background: A human orthologue of mouse S100A6-binding protein (CacyBP), Siah-1-interacting protein (SIP) had been shown to be a component of novel ubiquitinylation pathway regulating $\beta$-catenin degradation. The role of the protein seems to be important in cell proliferation and cancer evolution but the expression pattern of SIP in actively dividing cancer tissues has not been known. For the elucidation of the role of SIP protein in carcinogenesis, it is essential to produce monoclonal antibodies specific to the protein. Methods: cDNA sequence coding for ORF region of human SIP gene was amplified and cloned into an expression vector to produce His-tag fusion protein. Recombinant SIP protein and monoclonal antibody to the protein were produced. The N-terminal specificity of anti-SIP monoclonal antibody was conformed by immunoblot analysis and enzyme linked immunosorbent assay (ELISA). To study the relation between SIP and colon carcinogenesis, the presence of SIP protein in colon carcinoma tissues was visualized by immunostaining using the monoclonal antibody produced in this study. Results: His-tag-SIP (NSIP) recombinant protein was produced and purified. A monoclonal antibody (Korea patent pending; #2003-45296) to the protein was produced and employed to analyze the expression pattern of SIP in colon carcinoma tissues. Conclusion: The data suggested that anti-SIP monoclonal antibody produced here was valuable for the diagnosis of colon carcinoma and elucidation of the mechanism of colon carcinogenesis.

Production of a Monoclonal Antibody to Human $\alpha$-Fetopotein and Development of Monoclonal Antibody-Based Enzyme-Linked Immunosorbent Assays for Human $\alpha$-Fetoprotein (인간 $\alpha$-fetoprotein에 대한 모노클로날 항체의 제조 및 모노클로날 항체를 이용한 효소면역분석법의 개발)

  • Michung Yoon;Hyun-Hee Lee;Youngwon Lee
    • Biomedical Science Letters
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    • v.5 no.1
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    • pp.1-10
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    • 1999
  • This study was attempted to generate a monoclonal antibody against human $\alpha$-fetoprotein (AFP) and to produce an immunoassay, recognizing AFP in plasma and amniotic fluid. AFP was purified from human amniotic fluid and used to immunize mice. Spleens were taken from the mice and the cells were fused with mouse myeloma cells (Sp2/0-Ag-14) for the production of monoclonal antibodies by employing the hybridoma technology. As a result, a hybridoma cell line producing anti-AFP monoclonal antibody was cloned out and designated as MabF22. From isotyping analysis, it was found that monoclonal antibody MabF22 was IgG type with IgG1 heavy chain and k light chain. The binding specificity of MabF22 was analyzed by immunoblotting as well as by ELISA. MabF22 was highly specific, reacting with only AFP-containing samples. The binding affinity was determined by ELISA (free-capture mode) and Scatchard analysis. As a result, the value of Kd was 0.8$\times$10$^{-10}$M. The validity of the MabF22 for AFP assay was examined by two kinds of ELISAs, i.e., non-competitive and competitive ELISA. Both assays revealed that MabF22 reacted well with AFP in sample in a concentration-dependent manner. Standard curve and antibody titration curve were obtained by using purified AFP and MabF22. These results indicate that the monoclonal antibody produced in this study would be useful not only for research purposes but also for further development of immune-diagnostic kit for the measurement of AEP concentration.

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Generation and characterization of a monoclonal antibody with high species-specificity to Schistosoma japonicum glutathione S-transferase

  • Kim, Jung-Hwan;Park, Jung-Hyun;Ju, Sung-Kyu;Lee, Myung-Kyu;Kim, Kil Lyong
    • IMMUNE NETWORK
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    • v.1 no.3
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    • pp.187-195
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    • 2001
  • The expression of recombinant proteins fused to 26 kDa glutathione S-transferase (GST) extracted from Schistosoma japonicum represents an attractive system for purifiying proteins of interest in a single step using GST-affinity chromatography. In addition, the GST-tag is used conveniently for detecting fused proteins since its high solubility as well as its relatively small size rarely interferes with the biological activity of the fused protein. In this regard, the GST system is frequently applied for tracing fusion proteins in both prokaryotic and eukaryotic cells to elucidate the physiological interactions and functional compartments of proteins. To provide a further tool in analyzing GST-fusion proteins, a new monoclonal antibody, with a high specificity to the S. japonicum GST was produced. Methods: BALB/c mice were immunized both with recombinant S. japonicum GST proteins, and by the fusion of splenocytes from these mice with myeloma cells. From this, a new anti -GST monoclonal antibody, termed SARAH, was generated. The specificity and reactivity of this antibody was confirmed by ELISA and by Western blot analysis. Results: SARAH showed a high reactivity to recombinant GST and GST fusion protein but not with native mammalian GST proteins as derived from other species including humans, cows, rabbits and rats. The applicability of SARAH was further demonstrated by confocal laser scanning microscopy, where GST proteins that were expressed transiently in mouse fibroblast cells, were specifically detected without interference of endogenous GST. Conclusion: SARAH is new monoclonal antibody with a high specificity to recombinant GST proteins but not to endogenous GST in mammalian cells.

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Production of Monoclonal Antibody to Human Chorionic Gonadotropin(hCG) : Purification and Properties of a Monoclonal Antibody, and Immunochemiluminometric assay(ICMA) for the Assay of hCG (Human Chorionic Gonadotropin(hCG)에 대한 단일콜론항체 생산 : 단일클론항체의 분리정제 및 그 특성조사와 hCG정량을 위한 Immunochemiluminometric assay(ICMA)개발)

  • 최상훈;이병철;오재욱;이용환;서광영;정길생;김종배
    • Korean Journal of Animal Reproduction
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    • v.12 no.1
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    • pp.51-62
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    • 1988
  • Spleen cells of mouse immunized with hCG were fused with myeloma cell (SP 2/0 Ag 14) to produce monoclonal antibody against hCG. Several clones of hybridoma secreting monoclonal antibody were established and antibodies were characterized in terms of titer, subisotyping and sensitivity in immunoassay. Several methods, for the purification of anti¬bodies, based on gel-filtration, DEAE-ion exchange chromatography and affinity chromatography. were applied and compared each other by the result of SDS-PAGE. Two-site immunochemiluminometric assay (ICMA) involving the use of an excess concentration of a specific monoclonal antibody passively adsorbed onto the walls of plastic tubes and a chemiluminescence labelled antibody conjugate were de¬veloped for the determination of hCG as a preliminary study.

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The Determination of Blood-Brain Barrier Permeability and Pharmacokinetics of a Rat Transferrin Receptor Monoclonal Antibody by Brain Perfusion Method and Intravenous Injection Technique in Mice (마우스에서 뇌관류법과 정맥투여법에 의하여 흰쥐 트란스페린 단일항체의 체내동태 및 혈액-뇌 관문 투과성의 검토)

  • 강영숙
    • Biomolecules & Therapeutics
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    • v.10 no.1
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    • pp.37-42
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    • 2002
  • Brain drug targeting through the blood-brain barrier (BBB) in vivo is possible with peptidornirnetic monoclonal antibodies that undergo receptor-mediated transcytosis through the BBB. Monoclonal antibody to the rat transferrin receptor, such as the OX26 was studied in rats as a transport vector through BBB on the transferrin receptor. But, OX26 is not an effective brain delivery vector in mouse. In the present studies, rat monoclonal antibody, 8D3 to the mouse transferrin receptor were evaluated for brain drug targeting vector intransgenic mouse model. Pharrnacokinetic parameters in plasma and organ uptakes were determined at varioustimes after i.v. bolus injection of [$^{}125}I$] 8D3 in Balb/c mice. Brain uptake of [$^{}125}I$] 8D3 was also studied with an internal carotid artery perfusioncapillary depletion method. After i.v. injection of [$^{}125}I$] 8D3, plasma concentrations declined biexponentially with elimination half lift of approximately 2.2 hours. Brain uptake of [$^{}125}I$] 8D3 was $0.50{\pm}0.09$ persent of injected dose per g brain after 2 hours i.v. injection. After perfusion 5 min the apparent volume of distibution of [$^{}125}I$] 8D3 in brain was $22.3 {\mu}l/g,$ which was 4.8 fold higher than the intravascular volume. These studies indicate rat monoclonal antibody to the mouse transferrin receptor, 8D3 may be used for brain drug targeting vector in mice.

Monoclonal Antibody Refolding and Assembly: Protein Disulfide Isomerase Reaction Kinetics

  • Park, Sun-Ho;Ryu, Dewey D.Y.
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.8 no.2
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    • pp.59-63
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    • 2003
  • The protein disulfide isomerase (PDI) reaction kinetics has been studied to evaluate its effect on the monoclonal antibody (Mab) refolding and assembly which accompanies disulfide bend formation. The MAb in vitro assembly experiments showed that the assembly rate of heavy and light chains can be greatly enhanced in the presence of PDI as compared to the rate of assembly obtained by the air-oxidation. The reassembly patterns of MAb in-termediates were identical for both with and without PDI, suggesting that the PDI does not determine the MAb assembly pathway, but rather facilitates the rate of MAb assembly by promoting PDI catalyzed disulfide bond formation. The effect of growth rate on PDI activities for MAb production has also been examined by using continuous culture system. The specific MAb productivity of hybridoma cells decreased as the growth rate increased. However, PDI activities were nearly constant fur a wide range of growth rates except very high growth rate, indicating that no direct correlation between PDI activity and specific MAb productivity exists.

Monoclonal Antibody Refolding and Assembly: Protein Disulfide Isomerase Reaction Kinetics

  • Park, Sun-Ho;Ryu, Dewey D.Y.
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.1 no.1
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    • pp.13-17
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    • 1996
  • The protein disulfide isomerase(PDI) reaction kinetics has been studied to evaluate its effect on the monoclonal antibody(MAb) refolding and assembly which accompanies disulfide bond formation The MAb in vitro assembly experiments showed that the assembly rate of heavy and light chains can be greatly enhanced in the presence of PDI as compared to the rate of assembly obtained by the air-oxidation. The reassembly patterns of MAb intermediates were identical for both with and without PDI, suggesting that the PDI does not determine the MAb assembly pathway, but rather facilitates the rate of MAb assembly by promoting PDI catalyzed disulfide bond formation. The effect of growth rate on PDI activities for MAb production has also been examined by using continuous culture system. The specific MAb productivity of hybridoma cells decreased as the growth rate increased. However, PDI activities were nearly constant for a wide range of growth rates except very high growth rate, indicating that no direct correlation between PDI activity and specific MAb productivity exists.

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Ammonium Ion Effects and Its In Situ Removal by Using Immobilized Adsorbent in Hybridoma Cell Culture (하이브리도마 세포배양에서 암모늄 이온의 영향 및 고정화 흡착제에 의한 암모늄 이온의 동시제거)

  • 정연호;이해익
    • KSBB Journal
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    • v.11 no.3
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    • pp.329-339
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    • 1996
  • The effects of ammonium ion on cell growth kinetics, monoclonal antibody productivity, and cell metabolism of hybridoma cells were investigated. The mouse-mouse hybridoma cell line VlIIH-8 producing mouse IgG2a was used as a model system. Ammonium ion showed an inhibitory effect on cell growth and monoclonal antibody production. New immobilized adsorbents were developed for the reduction of the inhibitory effect of ammonium ion. The ammonium ion selective zeolite, Phillipsite-Gismondine was entrapped in calcium alginate bead or in dialysis membrane and applied to the hybridoma cell culture system for the in situ removal of ammonium ion from culture media. The effects of ammonium the both serum supplemented and serum free media on the cell growth were studied by applying immobilized adsorbents of calcium alginate bead type. The results demonstrated a substantial enhancement in cell growth. Applying immobilized adsorbents of dialysis membrane type to serum supplemented media also resulted in the stimulation of cell growth, cell viability and monoclonal antibody production.

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Immunohistochemical diagnosis on rabies virus using its monoclonal antibody in mice (단크론항체를 이용한 광견병바이러스의 면역병리조직학적 진단)

  • Kang, Mun-il;Park, Nam-yong;Song, Jae-yeong
    • Korean Journal of Veterinary Research
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    • v.33 no.2
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    • pp.255-261
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    • 1993
  • For a immunohistochemical diagnosis of the frozen and paraffin-embedded tissues against rabies virus, mice were intracerebrally inoculated with challege virus standard(CVS) rabies virus and then were used to detect the rabies viral antigen by the immunoperoxidase(IP) and the avidin-biotin complex(ABC) method. In this study, the results confirmed that ABC and IP methods, although the former showed more specific and sensitive than the latter, were reliable and effective for the demonstration of rabies virus in both frozen and paraffin-embedded brain tissues prepared from rabies-infected mice. Additionally, IP technique using the monoclonal antibody against rabies virus could be recommended as a standard diagnostic tool instead of the present immunofluorescent method for the local veterinary services in Korea.

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Partial Characterization of the Pathogenic Factors Related to Chlamydia trachomatis Invasion of the McCoy Cell Membrane

  • Yeo, Myeng-Gu;Kim, Young-Ju;Park, Yeal
    • Journal of Microbiology
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    • v.41 no.2
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    • pp.137-143
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    • 2003
  • The present study was performed to identify pathogenic factors of Chlamydia trachomatis, which invade the host cell membrane. We prepared monoclonal antibody against C. trachomatis and searched for pathogenic factors using this antibody, and subsequently identified the surface components of the elementary body of C. trachomatis, i.e., major outer membrane protein (MOMP), lipopolysaccharide (LPS), and two other surface exposure proteins. These proteins are believed to be important in the pathogenesis of host cell chlamydial infection. Additionally, to identify factors related to the host cell and C. trachomatis, we prepared C. trachomatis infected and non-infected McCoy cell extracts, and reacted these with anti-chlamydial LPS monoclonal antibody. We found that anti-chlamydial LPS monoclonal antibody reacted with a 116 kDa proteinaceous McCoy cell membrane component.