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Jeong DY, Lee J, Kim JY, Lee KH, Li H, Lee JY, Jeong GH, Yoon S, Park EL, Hong SH, Kang JW, Song TJ, Leyhe T, Eisenhut M, Kronbichler A, Smith L, Solmi M, Stubbs B, Koyanagi A, Jacob L, Stickley A, Thompson T, Dragioti E, Oh H, Brunoni AR, Carvalho AF, Kim MS, Yon DK, Lee SW, Yang JM, Ghayda RA, Shin JI, Fusar-Poli P. Empirical assessment of biases in cerebrospinal fluid biomarkers of Alzheimer's disease: an umbrella review and re-analysis of data from meta-analyses. Eur Rev Med Pharmacol Sci 2021; 25:1536-1547. [PMID: 33629323 DOI: 10.26355/eurrev_202102_24862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Alzheimer's disease (AD) is a leading cause of years lived with disability in older age, and several cerebrospinal fluid (CSF) markers have been proposed in individual meta-analyses to be associated with AD but field-wide evaluation and scrutiny of the literature is not available. MATERIALS AND METHODS We performed an umbrella review for the reported associations between CSF biomarkers and AD. Data from available meta-analyses were reanalyzed using both random and fixed effects models. We also estimated between-study heterogeneity, small-study effects, excess significance, and prediction interval. RESULTS A total of 38 meta-analyses on CSF markers from 11 eligible articles were identified and reanalyzed. In 14 (36%) of the meta-analyses, the summary estimate and the results of the largest study showed non-concordant results in terms of statistical significance. Large heterogeneity (I2≥75%) was observed in 73% and small-study effects under Egger's test were shown in 28% of CSF biomarkers. CONCLUSIONS Our results suggest that there is an excess of statistically significant results and significant biases in the literature of CSF biomarkers for AD. Therefore, the results of CSF biomarkers should be interpreted with caution.
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Affiliation(s)
- D Y Jeong
- Yonsei University College of Medicine, Seoul, Republic of Korea.
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Chae SC, Horibe Y, Jeong DY, Lee N, Iida K, Tanimura M, Cheong SW. Evolution of the domain topology in a ferroelectric. Phys Rev Lett 2013; 110:167601. [PMID: 23679638 DOI: 10.1103/physrevlett.110.167601] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Indexed: 06/02/2023]
Abstract
Topological materials, including topological insulators, magnets with Skyrmions and ferroelectrics with topological vortices, have recently attracted phenomenal attention in the materials science community. Complex patterns of ferroelectric domains in hexagonal REMnO(3) (RE: rare earths) turn out to be associated with the macroscopic emergence of Z(2)×Z(3) symmetry. The results of our depth profiling of crystals with a self-poling tendency near surfaces reveal that the partial dislocation (i.e., wall-wall) interaction, not the interaction between vortices and antivortices, is primarily responsible for topological condensation through the macroscopic breaking of the Z(2) symmetry.
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Affiliation(s)
- S C Chae
- Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
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Chae SC, Horibe Y, Jeong DY, Rodan S, Lee N, Cheong SW. Self-organization, condensation, and annihilation of topological vortices and antivortices in a multiferroic. Proc Natl Acad Sci U S A 2010; 107:21366-70. [PMID: 21115846 PMCID: PMC3003016 DOI: 10.1073/pnas.1011380107] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [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: 11/18/2022] Open
Abstract
The interaction among topological defects can induce novel phenomena such as disclination pairs in liquid crystals and superconducting vortex lattices. Nanoscale topological vortices with swirling ferroelectric, magnetic, and structural antiphase relationships were found in multiferroic h-YMnO(3). Herein, we report the discovery of intriguing, but seemingly irregular configurations of a zoo of topological vortices and antivortices. These configurations can be neatly analyzed in terms of graph theory and reflect the nature of self-organized criticality in complexity phenomena. External stimuli such as chemistry-driven or electric poling can induce the condensation and eventual annihilation of topological vortex-antivortex pairs.
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Affiliation(s)
- S. C. Chae
- Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, NJ 08854; and
| | - Y. Horibe
- Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, NJ 08854; and
| | - D. Y. Jeong
- Department of Mathematics, Soongsil University, Seoul 156-743, Korea
| | - S. Rodan
- Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, NJ 08854; and
| | - N. Lee
- Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, NJ 08854; and
| | - S.-W. Cheong
- Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, NJ 08854; and
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Abstract
Acori graminei Rhizoma (AGR) is shown to exhibit a number of pharmacological actions including sedation and anticonvulsive action. To further characterize its actions in the CNS, the present study evaluated the effects of essential oils (EO) from AGR on the excitotoxic neuronal cell death induced in primary rat cortical cell cultures. EO inhibited the glutamate-induced excitotoxicity in a concentration-dependent manner, with the IC50 of 0.241 mg/ml. EO exerted more potent neuroprotection against the toxicity induced by NMDA (IC50 = 0.139 mg/ml). In contrast, the AMPA-induced toxicity was not inhibited by EO. Receptor-ligand binding studies were performed to investigate the neuroprotective action mechanism. EO dramatically inhibited the specific bindings of a use-dependent NMDA receptorion channel blocker [3H]MK-801, indicating an NMDA receptor antagonist-like action. However, the bindings of [3H]MDL 105,519, a ligand selective for the glycine binding site of NMDA receptor, were not considerably inhibited. These results demonstrated that EO extracted from AGR exhibited neuroprotective effects on cultured cortical neurons through the blockade of NMDA receptor activity, and that the glycine binding site appeared not to be the major site of action.
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Affiliation(s)
- J Cho
- Department of Pharmacology, College of Medicine, Dongguk University, Kyongju, Kyongbuk, Korea.
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Cho J, Joo NE, Kong JY, Jeong DY, Lee KD, Kang BS. Inhibition of excitotoxic neuronal death by methanol extract of Acori graminei rhizoma in cultured rat cortical neurons. J Ethnopharmacol 2000; 73:31-37. [PMID: 11025136 DOI: 10.1016/s0378-8741(00)00262-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Acori graminei rhizoma (AGR) are reported to exhibit a number of pharmacological actions in the central nervous system. The effects of the methanol extract of AGR on excitotoxic neuronal death were evaluated in the present study using cultured rat cortical neurons. Based on the phase-contrast microscopic examinations of cultures and lactate dehydrogenase activities measured in the culture media, the glutamate-induced excitotoxicity was significantly inhibited by the extract. The inhibitory action of the extract was more potent and selective for the N-methyl-D-aspartate (NMDA) receptor-mediated toxicity. The AGR extract competed with [3H]MDL 105,519 for the specific binding to the glycine site of the NMDA receptor with the IC(50) value of 164.7 microg/ml. Modulation of the NMDA receptor activity by the extract was determined using [3H]MK-801 binding studies. The reduction of the binding in the presence of the extract indicated the receptor inactivation by AGR. These results demonstrated that the methanol extract of AGR exhibited protective action against excitotoxic neuronal death, and that the neuroprotective action was primarily due to the blockade of NMDA receptor function by the interaction with the glycine binding site of the receptor.
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Affiliation(s)
- J Cho
- Department of Pharmacology, College of Medicine, Dongguk University, 780-714, Kyongju, South Korea.
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Lee MJ, Jeong DY, Kim WS, Kim HD, Kim CH, Park WW, Park YH, Kim KS, Kim HM, Kim DS. A tetrodotoxin-producing Vibrio strain, LM-1, from the puffer fish Fugu vermicularis radiatus. Appl Environ Microbiol 2000; 66:1698-701. [PMID: 10742263 PMCID: PMC92044 DOI: 10.1128/aem.66.4.1698-1701.2000] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.3] [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: 11/20/2022] Open
Abstract
Identification of tetrodotoxin (TTX) and its derivatives produced from a Vibrio strain in the intestine of the puffer fish Fugu vermicularis radiatus was performed by thin-layer chromatography, electrophoresis, high-performance liquid chromatography, and gas chromatography-mass spectrometry, together with a mouse bioassay for toxicity. It was demonstrated that the isolated bacterium produced TTX, 4-epi-TTX, and anhTTX during cultivation, suggesting that Vibrio strains are responsible for the toxification of the puffer fish.
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Affiliation(s)
- M J Lee
- Department of Diagnosis, Biochemistry and Molecular Biology, College of Oriental Medicine, Dongguk University, Kyung-Ju 780-714, Korea
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Choi KI, Cha JH, Pae AN, Cho YS, Kim Y, Chang MH, Park SH, Park SY, Kim D, Jeong DY, Kim YH, Kong JY, Koh HY. Studies on novel 3-isoxazolylvinyl-cephalosporins: II. Synthesis and biological activity of 7-[2-(2-aminothiazol-4-yl)-2-hydroxy-iminoacetamido] derivatives. J Antibiot (Tokyo) 1998; 51:1122-5. [PMID: 10048574 DOI: 10.7164/antibiotics.51.1122] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- K I Choi
- Biochemical Research Center, Korea Institute of Science and Technology, Seoul
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Jeong DY. A sociological implication of environment in social development. Korea J Popul Dev 1997; 26:1-13. [PMID: 12293790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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Park CY, Chang JK, Jeong DY, Yoon GJ, Chung C, Kim JK, Han DC, Min BG. Development of a custom designed TAH using rapid prototyping. ASAIO J 1997; 43:M647-50. [PMID: 9360125] [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: 02/05/2023] Open
Abstract
The failure of the orthotopic implantation of a totally implantable artificial heart (TAH) was due mainly to anatomic mismatches in the conduits of the conventional TAH system. To overcome this anatomic incompatibility, a custom design and fabrication process was designed using the rapid prototyping (RP) technique. After three dimensional reconstruction of magnetic resonance imaging of the thoracic cavity and vascular remnants of the recipient, study of anatomic fit was done using the reconstructed thoracic model and three dimensional computer aided design (CAD) model. The direction of the inflow and outflow conduits of the blood sac was changed with a Unigraphics CAD. The RP model of the designed chamber was fabricated and examined for anatomic compatibility. Through this approach, the minute directional mismatch of the inflow and outflow conduits was improved. Thus, a new custom designed moving actuator Korean TAH with CAD and RP techniques was developed.
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Affiliation(s)
- C Y Park
- Department of Biomedical Engineering, Seoul National University, Korea
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Rubins RS, Black TD, Song KM, Jeong DY. Modulation corrections to the modulated microwave absorption of a pure mercury sample. Phys Rev B Condens Matter 1991; 43:210-215. [PMID: 9996205 DOI: 10.1103/physrevb.43.210] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Rubins RS, Black TD, Jeong DY. Modulated microwave absorption in superconducting mercury. Phys Rev B Condens Matter 1989; 40:2551-2554. [PMID: 9992147 DOI: 10.1103/physrevb.40.2551] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Rubins RS, Hutton SL, Drumheller JE, Jeong DY, Black TD. Noise in the microwave absorption of YBa2Cu3O7- delta. Phys Rev B Condens Matter 1989; 39:2775-2778. [PMID: 9948540 DOI: 10.1103/physrevb.39.2775] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Wang SJ, Naidu SV, Sharma SC, De DK, Jeong DY, Black TD, Krichene S, Reynolds JR, Owens JM. High-Tc superconductor YBa2Cu3O7- delta studied by positron annihilation. Phys Rev B Condens Matter 1988; 37:603-606. [PMID: 9943630 DOI: 10.1103/physrevb.37.603] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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