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Jung BK, An YH, Jang SH, Jang JJ, Kim S, Jeon JH, Kim J, Song JJ, Jang H. The artificial amino acid change in the sialic acid-binding domain of the hemagglutinin neuraminidase of newcastle disease virus increases its specificity to HCT 116 colorectal cancer cells and tumor suppression effect. Virol J 2024; 21:7. [PMID: 38178138 PMCID: PMC10768451 DOI: 10.1186/s12985-023-02276-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Accepted: 12/22/2023] [Indexed: 01/06/2024] Open
Abstract
BACKGROUND Oncolytic viruses are being studied and developed as novel cancer treatments. Using directed evolution technology, structural modification of the viral surface protein increases the specificity of the oncolytic virus for a particular cancer cell. Newcastle disease virus (NDV) does not show specificity for certain types of cancer cells during infection; therefore, it has low cancer cell specificity. Hemagglutinin is an NDV receptor-binding protein on the cell surface that determines host cell tropism. NDV selectivity for specific cancer cells can be increased by artificial amino acid changes in hemagglutinin neuraminidase HN proteins via directed evolution, leading to improved therapeutic effects. METHODS Sialic acid-binding sites (H domains) of the HN protein mutant library were generated using error-prone PCR. Variants of the H domain protein were screened by enzyme-linked immunosorbent assay using HCT 116 cancer cell surface molecules. The mutant S519G H domain protein showed the highest affinity for the surface protein of HCT 116 cells compared to that of different types of cancer cells. This showed that the S519G mutant H domain protein gene replaced the same part of the original HN protein gene, and S519G mutant recombinant NDV (rNDV) was constructed and recovered. S519G rNDV cancer cell killing effects were tested using the MTT assay with various cancer cell types, and the tumor suppression effect of the S519G mutant rNDV was tested in a xenograft mouse model implanted with cancer cells, including HCT 116 cells. RESULTS S519G rNDV showed increased specificity and enhanced killing ability of HCT 116 cells among various cancer cells and a stronger suppressive effect on tumor growth than the original recombinant NDV. Directed evolution using an artificial amino acid change in the NDV HN (S519G mutant) protein increased its specificity and oncolytic effect in colorectal cancer without changing its virulence. CONCLUSION These results provide a new methodology for the use of directed evolution technology for more effective oncolytic virus development.
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Affiliation(s)
| | - Yong Hee An
- Libentech Co. LTD, Daejeon, Republic of Korea
| | - Sung Hoon Jang
- Graduate School of Medical Science, College of medicine, Yonsei University, Seoul, Republic of Korea
| | - Jin-Ju Jang
- Libentech Co. LTD, Daejeon, Republic of Korea
| | - Seonhee Kim
- Libentech Co. LTD, Daejeon, Republic of Korea
| | | | - Jinju Kim
- Libentech Co. LTD, Daejeon, Republic of Korea
| | - Jason Jungsik Song
- Division of Rheumatology, Department of Internal Medicine, College of Medicine, Yonsei University, Seoul, Korea
- Institute for Immunology and Immunological Disease, College of Medicine, Yonsei University, Seoul, Korea
| | - Hyun Jang
- Libentech Co. LTD, Daejeon, Republic of Korea.
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Jung BK, An YH, Jang JJ, Jeon JH, Jang SH, Jang H. The human ACE-2 receptor binding domain of SARS-CoV-2 express on the viral surface of the Newcastle disease virus as a non-replicating viral vector vaccine candidate. PLoS One 2022; 17:e0263684. [PMID: 35134091 PMCID: PMC8824364 DOI: 10.1371/journal.pone.0263684] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 01/24/2022] [Indexed: 12/24/2022] Open
Abstract
Since the SARS-CoV-2 infection was identified in December 2019, SARS-CoV-2 infection has rapidly spread worldwide and has become a significant pandemic disease. In addition, human death and serious health problem caused by SARS-CoV-2 infection, the socio-economic impact has been very serious. Here, we describe the development of the viral vector vaccine, which is the receptor-binding domain (RBD) of SARS-CoV-2 expressed on the surface of Newcastle disease virus (LVP-K1-RBD19). The RBD protein concentrations on the viral surface were measured by the sandwich ELISA method. 106.7 TCID50/ml of LVP-K1-RBD19 has a 0.17 μg of RBD protein. Optical density (OD) values of mouse sera inoculated with 10 μg of RBD protein expressed on the surface of LVP-K1-RBD19 generated 1.78-fold higher RBD-specific antibody titers than mice inoculated with 10 μg RBD protein with alum at 28 dpi. Moreover, mice inoculated with 10 μg of RBD protein expressed on the surface of LVP-K1-RBD19 virus showed more than 80% neutralization at 1:256 against the SARS-CoV-2 pseudovirus. These results demonstrated that inactivated LVP-K1-RBD19 virus produces neutralizing antibodies against SARS-CoV-2 in a short period and could be elect protective immunity in humans and LVP-K1-RBD19 will be a good candidate for the COVID-19 vaccine.
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Affiliation(s)
| | - Yong Hee An
- Libentech Co. LTD, Daejeon, Republic of Korea
| | - Jin-Ju Jang
- Libentech Co. LTD, Daejeon, Republic of Korea
| | | | - Sung Hoon Jang
- Department of Biological Sciences, College of Natural Sciences, Inha University, Incheon, Republic of Korea
| | - Hyun Jang
- Libentech Co. LTD, Daejeon, Republic of Korea
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Jung BK, An Y, Park JE, Chang KS, Jang H. Development of a recombinant vaccine containing a spike S1-Fc fusion protein induced protection against MERS-CoV in human DPP4 knockin transgenic mice. J Virol Methods 2022; 299:114347. [PMID: 34728273 PMCID: PMC8556695 DOI: 10.1016/j.jviromet.2021.114347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 10/22/2021] [Accepted: 10/27/2021] [Indexed: 11/30/2022]
Abstract
The Middle East respiratory syndrome coronavirus (MERS-CoV), belonging to the family Coronaviridae and genus Betacoronavirus, has been recognized as a highly pathogenic virus. Due to the lack of therapeutic or preventive agents against MERS-CoV, developing an effective vaccine is essential for preventing a viral outbreak. To address this, we developed a recombinant S1 subunit of MERS-CoV spike protein fused with the human IgG4 Fc fragment (LV-MS1-Fc) in Chinese hamster ovary (CHO) cells. Thereafter, we identified the baculovirus gp64 signal peptide-directed secretion of LV-MS1-Fc protein in the extracellular fluid. To demonstrate the immunogenicity of the recombinant LV-MS1-Fc proteins, BALB/c mice were inoculated with 2.5 μg of LV-MS1-Fc. The inoculated mice demonstrated a significant humoral immune response, measured via total IgG and neutralizing antibodies. In addition, human dipeptidyl peptidase-4 (DPP4) transgenic mice vaccinated with LV-MS1-Fc showed the protective capacity of LV-MS1-Fc against MERS-CoV with no inflammatory cell infiltration. These data showed that the S1 and Fc fusion protein induced potent humoral immunity and antigen-specific neutralizing antibodies in mice, and conferred protection against coronavirus viral challenge, indicating that LV-MS1-Fc is an effective vaccine candidate against MERS-CoV infection.
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Affiliation(s)
| | - YongHee An
- Libentech Co., Ltd., Daejeon, Republic of Korea
| | - Jung-Eun Park
- Department of Veterinary Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Kyung-Soo Chang
- Department of Clinical Laboratory Science, Catholic University of Pusan, Busan, Republic of Korea
| | - Hyun Jang
- Libentech Co., Ltd., Daejeon, Republic of Korea.
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Jung BK, Kim HR, Jang H, Chang KS. Replacing the decoy epitope of PCV2 capsid protein with epitopes of GP3 and/or GP5 of PRRSV enhances the immunogenicity of bivalent vaccines in mice. J Virol Methods 2020; 284:113928. [PMID: 32650038 DOI: 10.1016/j.jviromet.2020.113928] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Revised: 04/15/2020] [Accepted: 07/04/2020] [Indexed: 11/18/2022]
Abstract
Porcine circovirus type 2 (PCV2) is the causative agent of postweaning multisystemic wasting syndrome (PMWS), porcine dermatitis and nephropathy syndrome (PDNS), and reproductive failure and causes economic losses in the domestic swine industry. The decoy epitope (169-180 amino acid (aa)) of the PCV2 capsid (Cap) protein is an immunodominant epitope and diverts the immune response away from protective epitopes. The mixed infection of PCV2 and porcine reproductive and respiratory syndrome virus (PRRSV) is one of the most common co-infections in the pig industry and shows more severe clinical symptoms. Linear B-cell antigenic epitopes of PRRSV GP3 epitope Ⅰ (61-72aa) and PRRSV GP5 epitope Ⅳ (187-200aa) efficiently elicited neutralizing antibodies against PRRSV. The recombinant baculovirus expressing the Cap protein (Bac-Cap) was modified by replacing the decoy epitope of the Cap protein with either the PRRSV GP3 epitope Ⅰ, the PRRSV GP5 epitope Ⅳ, or the PRRSV GP3 epitope Ⅰ- GP5 epitope Ⅳ to produce the recombinant baculoviruses Bac-Cap-GP3, Bac-Cap-GP5 and Bac-Cap-GP35. The four recombinant baculoviruses were successfully established and characterized as demonstrated with western blot analysis and immunofluorescence assay. Immunogenicities of the four recombinant baculoviruses in mice were tested in sera harvested at 21 and 42 days post-primary immunization. The titers of antibodies in the sera were determined by a PCV2-specific enzyme-linked immunosorbent assay (ELISA) and a serum neutralization assay. The serum IFN-γ levels were measured by indirect ELISA. The results showed that Bac-Cap-GP3, Bac-Cap-GP5, and Bac-Cap-GP35 elicited higher GP3/GP5 and Cap antibody titers than the Bac-Cap. Virus neutralization test also confirmed that the serum from the Bac-Cap-GP3 immunized mice had high levels of the both PCV2 and PRRSV neutralization antibodies. These findings collectively demonstrated that substituting the decoy epitope of the PCV2 capsid substituted with PRRSV epitopes could be developed into an effective vaccine against PCV2.
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Affiliation(s)
- Bo-Kyoung Jung
- Department of Clinical Laboratory Science, Catholic University of Pusan, Busan, 48513, Republic of Korea; Libentech Co. LTD, C-722 Daedeok BIZ Center, Techno 4-ro, 17 Yuseong-gu, Daejeon, 34013, Republic of Korea.
| | - Hye-Ran Kim
- Department of Clinical Laboratory Science, College of Medical Sciences, Daegu Haany University, Daegu, 38610, Republic of Korea.
| | - Huyn Jang
- Libentech Co. LTD, C-722 Daedeok BIZ Center, Techno 4-ro, 17 Yuseong-gu, Daejeon, 34013, Republic of Korea.
| | - Kyung-Soo Chang
- Department of Clinical Laboratory Science, Catholic University of Pusan, Busan, 48513, Republic of Korea.
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Jung BK, Kim HR, Lee YH, Jang H, Chang KS. Comparison of Immune Responses to the PCV2 Replicase-Capsid and Capsid Virus-Like Particle Vaccines in Mice. J Microbiol Biotechnol 2019; 29:482-488. [DOI: 10.4014/jmb.1809.09032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Kim HR, Jung BK, Yeo MH, Yoon WJ, Chang KS. Inhibition of lipid accumulation by the ethyl acetate fraction of Distylium racemosum in vitro and in vivo. Toxicol Rep 2019; 6:215-221. [PMID: 30891421 PMCID: PMC6403441 DOI: 10.1016/j.toxrep.2019.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 02/19/2019] [Accepted: 02/22/2019] [Indexed: 11/16/2022] Open
Abstract
Lipid accumulation in the 3T3-L1 cells were inhibited by treatment with DRE. The expression levels of SREBP1c, PPARγ, C/EBPα, and FAS were decreased by DRE. HFD induced fat mice showed lower rate of weight gain and serum TG level through DRE administration.
This study confirms the anti-obesity effect of the ethyl acetate fraction of Distylium racemosum (DRE), a member of Hamamelidaceae, that naturally grows on Jeju Island, on adipocyte differentiation in 3T3-L1 cells. This study further demonstrated that DRE exhibits anti-obesity effects in C57BL/6 obese mice. The degree of adipocyte differentiation was determined using Oil red O stain; results indicated a decrease in fat globules, which was dependent on DRE concentration, when pre-adipocytes were treated with differentiation-inducing agents. In addition, this significantly reduced the expression of the adipogenic transcription factor and related genes. C57BL/6 obese mice treated with DRE showed a lower rate of body weight gain than the high-fat diet (HFD) group mice. Further, the level of serum triglyceride in the DRE treatment group was lower than that in the HFD group. The findings show that DRE are capable of suppressing adipocyte accumulation; therefore, DRE may represent a promising source of functional materials for the anti-obesity.
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Affiliation(s)
- Hye-Ran Kim
- Department of Clinical Laboratory Science, College of Health Sciences, Catholic University of Pusan, Busan 46252, Republic of Korea.,Department of Clinical Laboratory Science, College of Medical Sciences, Daegu Haany University, Gyeongsan 38610, Republic of Korea
| | - Bo-Kyoung Jung
- Department of Clinical Laboratory Science, College of Health Sciences, Catholic University of Pusan, Busan 46252, Republic of Korea
| | - Min-Ho Yeo
- Department of Clinical Laboratory Science, College of Health Sciences, Catholic University of Pusan, Busan 46252, Republic of Korea
| | - Weon-Jong Yoon
- Jeju Biodiversity Research Institute, Jeju Technopark, Jeju 63208, Republic of Korea
| | - Kyung-Soo Chang
- Department of Clinical Laboratory Science, College of Health Sciences, Catholic University of Pusan, Busan 46252, Republic of Korea
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Jung BK, Ryue J, Hong C, Jeong WB, Shin KK. Estimation of dispersion curves of water-loaded structures by using approximated acoustic mass. Ultrasonics 2018; 85:39-48. [PMID: 29307620 DOI: 10.1016/j.ultras.2017.12.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2017] [Revised: 10/15/2017] [Accepted: 12/29/2017] [Indexed: 06/07/2023]
Abstract
For coupled structures surrounded by heavy fluids, it is difficult to obtain dispersion curves from an eigenvalue analysis, because the external fluid term in the coupled equation includes transcendental functions for frequency and wavenumber. Thus, in this study, the acoustic mass of the external fluid was approximated as a function of frequency or wavenumber only. The coupled equation can then be used to calculate eigenvalues, and can estimate dispersion curves from an eigenvalue analysis. Because of this assumption, those dispersion curves will contain errors. Accordingly, those errors were evaluated in this study through a comparison with a dispersion curve derived from forced responses. The acoustic mass was also evaluated for a water-loaded plate; this can be formulated theoretically. As a result, the acoustic mass is less sensitive to frequency changes than wavenumber changes, and using the fluid term defined at a low frequency has advantages when estimating the dispersion curve. Finally, the generality of the proposed method was identified through the application for a submerged cylindrical shell.
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Affiliation(s)
- B K Jung
- Agency for Defense Development, 645-016, South Korea
| | - J Ryue
- School of Naval Architecture and Ocean Engineering, University of Ulsan, 680-749, South Korea.
| | - C Hong
- School of Mechanical Engineering, Ulsan College, 680-749, South Korea
| | - W B Jeong
- School of Mechanical Engineering, Pusan National University, 609-735, South Korea
| | - K K Shin
- Agency for Defense Development, 645-016, South Korea
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Affiliation(s)
- Hye-Ran Kim
- Department of Clinical Laboratory Science, Catholic University of Pusan, Busan 46252, Korea
| | - Gyu-Nam Park
- Department of Clinical Laboratory Science, Catholic University of Pusan, Busan 46252, Korea
| | - Bo-Kyoung Jung
- Department of Clinical Laboratory Science, Catholic University of Pusan, Busan 46252, Korea
| | - Weon-Jong Yoon
- Jeju Biodiversity Research Institute, Jeju Technopark, Jeju 63208, Korea
| | - Yong-Hwan Jung
- Jeju Biodiversity Research Institute, Jeju Technopark, Jeju 63208, Korea
| | - Kyung-Soo Chang
- Department of Clinical Laboratory Science, Catholic University of Pusan, Busan 46252, Korea
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Kim TS, Jeong SH, Chang DH, In SR, Park M, Jung BK, Lee KW, Wang SJ, Bae YS, Park HT, Kim JS, Cho W, Choi DJ. Modification to the accelerator of the NBI-1B ion source for improving the injection efficiency. Rev Sci Instrum 2016; 87:02B317. [PMID: 26932045 DOI: 10.1063/1.4935004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Minimizing power loss of a neutral beam imposes modification of the accelerator of the ion source for further improvement of the beam optics. The beam optics can be improved by focusing beamlets. The injection efficiencies by the steering of ion beamlets are investigated numerically to find the optimum modification of the accelerator design of the NBI-1B ion source. The beam power loss was reduced by aperture displacement of three edge beamlets arrays considering power loadings on the beamline components. Successful testing and operation of the ion source at 60 keV/84% of injection efficiency led to the possibility of enhancing the system capability to a 2.4 MW power level at 100 keV/1.9 μP.
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Affiliation(s)
- T S Kim
- Korea Atomic Energy Research Institute, Daejeon 34057, South Korea
| | - S H Jeong
- Korea Atomic Energy Research Institute, Daejeon 34057, South Korea
| | - D H Chang
- Korea Atomic Energy Research Institute, Daejeon 34057, South Korea
| | - S R In
- Korea Atomic Energy Research Institute, Daejeon 34057, South Korea
| | - M Park
- Korea Atomic Energy Research Institute, Daejeon 34057, South Korea
| | - B K Jung
- Korea Atomic Energy Research Institute, Daejeon 34057, South Korea
| | - K W Lee
- Korea Atomic Energy Research Institute, Daejeon 34057, South Korea
| | - S J Wang
- National Fusion Research Institute, Daejeon 34143, South Korea
| | - Y S Bae
- National Fusion Research Institute, Daejeon 34143, South Korea
| | - H T Park
- National Fusion Research Institute, Daejeon 34143, South Korea
| | - J S Kim
- National Fusion Research Institute, Daejeon 34143, South Korea
| | - W Cho
- National Fusion Research Institute, Daejeon 34143, South Korea
| | - D J Choi
- National Fusion Research Institute, Daejeon 34143, South Korea
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Yang J, Lee JW, Jung BK, Chung KJ, Hwang YS. Development of internal magnetic probe for current density profile measurement in Versatile Experiment Spherical Torus. Rev Sci Instrum 2014; 85:11D809. [PMID: 25430222 DOI: 10.1063/1.4886429] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
An internal magnetic probe using Hall sensors to measure a current density profile directly with perturbation of less than 10% to the plasma current is successfully operated for the first time in Versatile Experiment Spherical Torus (VEST). An appropriate Hall sensor is chosen to produce sufficient signals for VEST magnetic field while maintaining the small size of 10 mm in outer diameter. Temperature around the Hall sensor in a typical VEST plasma is regulated by blown air of 2 bars. First measurement of 60 kA VEST ohmic discharge shows a reasonable agreement with the total plasma current measured by Rogowski coil in VEST.
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Affiliation(s)
- J Yang
- Department of Nuclear Engineering, Seoul National University, Seoul 151-744, South Korea
| | - J W Lee
- Department of Nuclear Engineering, Seoul National University, Seoul 151-744, South Korea
| | - B K Jung
- SNU Division of Graduate Education for Sustainabilization of Foundation Energy, Seoul National University, Seoul 151-744, South Korea
| | - K J Chung
- SNU Division of Graduate Education for Sustainabilization of Foundation Energy, Seoul National University, Seoul 151-744, South Korea
| | - Y S Hwang
- Department of Nuclear Engineering, Seoul National University, Seoul 151-744, South Korea
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Jung BK, Dang JJ, An YH, Chung KJ, Hwang YS. Development of a novel radio-frequency negative hydrogen ion source in conically converging configuration. Rev Sci Instrum 2014; 85:02B112. [PMID: 24593552 DOI: 10.1063/1.4830424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Volume-produced negative ion source still requires enhancement of current density with lower input RF (radio-frequency) power in lower operating pressure for various applications. To confirm recent observation of efficient negative ion production with a short cylindrical chamber with smaller effective plasma size, the RF-driven transformer-coupled plasma H(-) ion source at Seoul National University is modified by adopting a newly designed quartz RF window to reduce the chamber length. Experiments with the reduced chamber length show a few times enhancement of H(-) ion beam current compared to that extracted from the previous chamber design, which is consistent with the measured H(-) ion population. Nevertheless, decrease in H(-) ion beam current observed in low pressure regime below ∼5 mTorr owing to insufficient filtering of high energy electrons in the extraction region needs to be resolved to address the usefulness of electron temperature control by the change of geometrical configuration of the discharge chamber. A new discharge chamber with conically converging configuration has been developed, in which the chamber diameter decreases as approaching to the extraction region away from the planar RF antenna such that stronger filter magnetic field can be utilized to prohibit high energy electrons from transporting to the extraction region. First experimental results for the H(-) ion beam extraction with this configuration show that higher magnetic filter field makes peak negative beam currents happen in lower operating pressure. However, overall decrease in H(-) ion beam current due to the change of chamber geometry still requires further study of geometrical effect on particle transport and optimization of magnetic field in this novel configuration.
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Affiliation(s)
- B K Jung
- Department of Nuclear Engineering, Seoul National University, Seoul 151-742, South Korea
| | - J J Dang
- Department of Nuclear Engineering, Seoul National University, Seoul 151-742, South Korea
| | - Y H An
- Department of Nuclear Engineering, Seoul National University, Seoul 151-742, South Korea
| | - K J Chung
- Center for Advance Research in Fusion Reactor Engineering, Seoul National University, Seoul 151-742, South Korea
| | - Y S Hwang
- Department of Nuclear Engineering, Seoul National University, Seoul 151-742, South Korea
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Shin YK, Yoon IY, Han EK, No YM, Hong MC, Yun YD, Jung BK, Chung SH, Choi JB, Cyn JG, Lee YJ, Hong SC. Prevalence of narcolepsy-cataplexy in Korean adolescents. Acta Neurol Scand 2008; 117:273-8. [PMID: 17922892 DOI: 10.1111/j.1600-0404.2007.00930.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Narcolepsy typically begins between adolescence and early adulthood causing severe neuropsychiatric impairments, but few prevalence studies are available on adolescent narcoleptics. In the present study, we investigated the prevalence of narcolepsy-cataplexy in adolescents. METHODS In total 20,407 students, aged 14-19 years, participated in this study. Ullanlinna Narcolepsy Scale (UNS) was applied to all subjects and those with a UNS score of > or =14 were contacted by phone for semi-structured interview. Subjects then suspected of having narcolepsy participated in a laboratory investigation, which included polysomnography and HLA typing, or were interviewed in detail by telephone. RESULTS Three subjects were finally diagnosed as narcolepsy with cataplexy and seven subjects might be diagnosed as narcolepsy without cataplexy. Among three narcoleptics with cataplexy, two subjects were HLA-DQB1*0602 and DRB1*1501 positive, but one subject had no test of HLA typing. The prevalence of narcolepsy with cataplexy in Korean adolescence was thus determined to be 0.015% (95% confidence interval = 0.0-0.0313%). CONCLUSION This epidemiologic study is the first of its type on adolescent narcolepsy to use the International Classification of Sleep Disorders, 2nd edition (ICSD-2) diagnostic criteria. Considering those cases with an onset after adolescence were not included, the prevalence of narcolepsy with cataplexy determined in the present study is comparable with that of other studies in adults.
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Affiliation(s)
- Y K Shin
- Department of Psychiatry, St Vincent's Hospital, The Catholic University of Korea, Suwon, Korea
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Jung BK, Pyo JH, Kim WS, Nam BH, Hwang SJ, Hwang B. Cloning of genes specifically expressed in rice embryogenic cells. Mol Cells 1998; 8:62-7. [PMID: 9571633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
We have examined differences in gene expression pattern between embryogenic callus (EC) and nonembryogenic callus (NEC) derived from mature seed embryo of rice (Oryza sativa L. cv Donggin). Three EC-specific transcripts were identified by differential display of amplified cDNAs. Specific expression of two partial cDNAs, designated as REC1 and REC2, respectively, was confirmed by a northern blot analysis. Partial nucleotide sequence of the clone REC1 showed no homology with any known genes, but partial amino acid sequence deduced from the clone REC2 exhibited 55-82% homology with nickel-cobalt-resistant proteins identified from a bacterium, Alcaligenes eutrophus CH34.
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Affiliation(s)
- B K Jung
- Department of Medical Laboratory Technology, Seokang Junior College, Kwangju, Korea
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