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Wang W, Park C, Oh E, Sung Y, Lee J, Park KH, Kang H. Correction to Benzophenone Compounds, from a Marine-Derived Strain of the Fungus Pestalotiopsis neglecta, Inhibit Proliferation of Pancreatic Cancer Cells by Targeting the MEK/ERK Pathway. J Nat Prod 2020; 83:1354. [PMID: 32091887 DOI: 10.1021/acs.jnatprod.0c00158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
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Wang W, Park C, Oh E, Sung Y, Lee J, Park KH, Kang H. Benzophenone Compounds, from a Marine-Derived Strain of the Fungus Pestalotiopsis neglecta, Inhibit Proliferation of Pancreatic Cancer Cells by Targeting the MEK/ERK Pathway. J Nat Prod 2019; 82:3357-3365. [PMID: 31829592 DOI: 10.1021/acs.jnatprod.9b00646] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Pancreatic cancer, which has an extremely poor prognosis, is one of the most fatal human cancers. Chemotherapy is the main palliative treatment for advanced cancer patients and also plays an indispensable role in postoperative treatments for surgical patients. Therefore, there is an urgent need to develop more innovative anticancer drugs to fight against this fatal disease. Here, we investigate the potential of benzophenone derivatives, obtained from a marine-derived strain of the fungus Pestalotiopsis neglecta, as antiproliferative lead compounds for the treatment of pancreatic cancer. The compounds, seven new (1-7) and two known (8 and 9) halogenated benzophenone derivatives, were obtained by bioactivity-guided fractionation from the cultures of Pestalotiopsis neglecta. The structures were defined by spectroscopic methods including X-ray crystallographic analysis. Using the commonly used pancreatic cancer cell line PANC-1, 2 and 4 were found to suppress cell proliferation and induce apoptosis in the low micromolar range of 7.6 and 7.2 μM, respectively. Mechanistically, benzophenone derivatives not only inhibit MEK activity in the cytoplasm but also suppress ERK activity in the cytoplasm and nucleus. An in silico study suggests that benzophenone derivatives could potentially inhibit MEK activity by binding to the allosteric pocket in MEK. Benzophenones could serve as new lead compounds for the treatment of pancreatic cancer.
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Affiliation(s)
- Weihong Wang
- Research Institute of Oceanography , Seoul National University , NS-80 , 08826 , Seoul , Korea
| | | | | | | | | | | | - Heonjoong Kang
- Research Institute of Oceanography , Seoul National University , NS-80 , 08826 , Seoul , Korea
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Wang W, Lee J, Kim KJ, Sung Y, Park KH, Oh E, Park C, Son YJ, Kang H. Austalides, Osteoclast Differentiation Inhibitors from a Marine-Derived Strain of the Fungus Penicillium rudallense. J Nat Prod 2019; 82:3083-3088. [PMID: 31710223 DOI: 10.1021/acs.jnatprod.9b00690] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Four new meroterpenoids, austalides V-X (1-3) and a farnesylated phthalide derivative (4), were isolated from the culture of the marine fungus Penicillium rudallense, together with eight known meroterpenoids derivatives (5-12). Their structures, including absolute configurations, were determined by spectroscopic methods. All of the isolated compounds were evaluated for their inhibitory activities on the receptor activator of nuclear factor κB ligand (RANKL)-induced osteoclast differentiation. Compounds 1, 2, 5-7, and 10 exhibited potent osteoclast differentiation inhibitory activity with ED50 values of 1.9-2.8 μM.
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Affiliation(s)
- Weihong Wang
- Laboratory of Marine Drugs, School of Earth and Environmental Sciences , Seoul National University , NS-80, Seoul 08826 , Korea
- Research Institute of Oceanography , Seoul National University , NS-80, Seoul 08826 , Korea
| | - Jusung Lee
- Laboratory of Marine Drugs, School of Earth and Environmental Sciences , Seoul National University , NS-80, Seoul 08826 , Korea
| | - Kwang-Jin Kim
- Department of Pharmacy , Sunchon National University , 315 Maegok-dong , Suncheon , Jeollanam-do 57922 , Korea
| | - Youjung Sung
- Laboratory of Marine Drugs, School of Earth and Environmental Sciences , Seoul National University , NS-80, Seoul 08826 , Korea
| | - Kyu-Hyung Park
- Laboratory of Marine Drugs, School of Earth and Environmental Sciences , Seoul National University , NS-80, Seoul 08826 , Korea
| | - Eunseok Oh
- Laboratory of Marine Drugs, School of Earth and Environmental Sciences , Seoul National University , NS-80, Seoul 08826 , Korea
| | - Chanyoon Park
- Laboratory of Marine Drugs, School of Earth and Environmental Sciences , Seoul National University , NS-80, Seoul 08826 , Korea
- Interdisciplinary Graduate Program in Genetic Engineering , Seoul National University , NS-80, Seoul 08826 , Korea
| | - Young-Jin Son
- Department of Pharmacy , Sunchon National University , 315 Maegok-dong , Suncheon , Jeollanam-do 57922 , Korea
| | - Heonjoong Kang
- Laboratory of Marine Drugs, School of Earth and Environmental Sciences , Seoul National University , NS-80, Seoul 08826 , Korea
- Research Institute of Oceanography , Seoul National University , NS-80, Seoul 08826 , Korea
- Interdisciplinary Graduate Program in Genetic Engineering , Seoul National University , NS-80, Seoul 08826 , Korea
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Sung Y, Chang C. Modified Single Port Laparoscopic Myomectomy versus Conventional Laparoscopic Myomectomy: A Comparison of Surgical Outcomes. J Minim Invasive Gynecol 2018. [DOI: 10.1016/j.jmig.2018.09.210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Seo C, Kwack M, Kim M, Kim J, Sung Y. 1324 Impairment of hair-inducing capacity of 3D-cultured human dermal papilla cells by the ablation of STAT5. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.1341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Sung Y, Kang Y, Bak S, Oh J, Kim M, Kim J. 847 Analysis of prostaglandin D2 receptor 2 expression during hair follicle cycling. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sung Y, Kwack M, Jung M. 854 CCL5 affects the hair-inductive capacity of three-dimensional (3D)-cultured dermal papilla cells. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Kim J, Lee B, Kim S, Kim T, Park S, Kim H, Sung Y, Kim S, Shin E. 258 PD-L1 regulates psoriatic inflammation by suppressing TCR-mediated IL-17 production of PD-1+ T cells. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Wang W, Kim H, Patil RS, Giri AG, Won DH, Hahn D, Sung Y, Lee J, Choi H, Nam SJ, Kang H. Cadiolides J-M, antibacterial polyphenyl butenolides from the Korean tunicate Pseudodistoma antinboja. Bioorg Med Chem Lett 2016; 27:574-577. [PMID: 28043797 DOI: 10.1016/j.bmcl.2016.12.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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: 07/27/2016] [Revised: 12/01/2016] [Accepted: 12/05/2016] [Indexed: 11/19/2022]
Abstract
Activity-guided fractionations of the tunicate Pseudodistoma antinboja yielded four new compounds of the cadiolide class (cadiolides J-M, 1, 3-5) along with a known one (cadiolide H, 2). The structures were defined by spectroscopic methods including X-ray crystallographic analysis. These compounds were evaluated for their antibacterial activity and exhibited potent antibacterial activity against all of the drug resistant strains tested with MICs comparable to those of marketed drugs such as vancomycin and linezolid.
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Affiliation(s)
- Weihong Wang
- Center for Marine Natural Products and Drug Discovery, School of Earth and Environmental Sciences, Seoul National University, NS-80, Seoul 08826, Republic of Korea
| | - Hiyoung Kim
- Center for Marine Natural Products and Drug Discovery, School of Earth and Environmental Sciences, Seoul National University, NS-80, Seoul 08826, Republic of Korea
| | - Rahul S Patil
- Center for Marine Natural Products and Drug Discovery, School of Earth and Environmental Sciences, Seoul National University, NS-80, Seoul 08826, Republic of Korea
| | - Awadut G Giri
- Center for Marine Natural Products and Drug Discovery, School of Earth and Environmental Sciences, Seoul National University, NS-80, Seoul 08826, Republic of Korea
| | - Dong Hwan Won
- Center for Marine Natural Products and Drug Discovery, School of Earth and Environmental Sciences, Seoul National University, NS-80, Seoul 08826, Republic of Korea
| | - Dongyup Hahn
- Center for Marine Natural Products and Drug Discovery, School of Earth and Environmental Sciences, Seoul National University, NS-80, Seoul 08826, Republic of Korea
| | - Youjung Sung
- Center for Marine Natural Products and Drug Discovery, School of Earth and Environmental Sciences, Seoul National University, NS-80, Seoul 08826, Republic of Korea
| | - Jusung Lee
- Center for Marine Natural Products and Drug Discovery, School of Earth and Environmental Sciences, Seoul National University, NS-80, Seoul 08826, Republic of Korea
| | - Hyukjae Choi
- College of Pharmacy, Yeungnam University, 214-1 Dae-dong, Gyeongsan 38541, Republic of Korea
| | - Sang-Jip Nam
- Department of Chemistry and Nano Science, Global Top 5 Program, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Heonjoong Kang
- Center for Marine Natural Products and Drug Discovery, School of Earth and Environmental Sciences, Seoul National University, NS-80, Seoul 08826, Republic of Korea; Research Institute of Oceanography, Seoul National University, NS-80, Seoul 08826, Republic of Korea.
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Brown C, Zhang H, Kucukboyaci V, Sung Y. Best estimate plus uncertainty analysis of departure from nucleate boiling limiting case with CASL core simulator VERA-CS in response to PWR main steam line break event. Nuclear Engineering and Design 2016. [DOI: 10.1016/j.nucengdes.2016.09.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kwack M, Kim M, Kim J, Sung Y. 705 Ablation of alkaline phosphatase in human dermal papilla spheroid impairs hair follicle induction. J Invest Dermatol 2016. [DOI: 10.1016/j.jid.2016.02.747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Liu DM, Torchen LC, Sung Y, Paparodis R, Legro RS, Grebe SK, Singh RJ, Taylor RL, Dunaif A. Evidence for gonadotrophin secretory and steroidogenic abnormalities in brothers of women with polycystic ovary syndrome. Hum Reprod 2014; 29:2764-72. [PMID: 25336708 DOI: 10.1093/humrep/deu282] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
STUDY QUESTION Are there abnormalities in gonadotrophin secretion, adrenal steroidogenesis and/or testicular steroidogenesis in brothers of women with polycystic ovary syndrome (PCOS)? SUMMARY ANSWER Brothers of women with PCOS have increased gonadotrophin responses to gonadotrophin releasing hormone (GnRH) agonist stimulation and alterations in adrenal and gonadal steroidogenesis. WHAT IS KNOWN ALREADY PCOS is a complex genetic disease. Male as well as female first-degree relatives have reproductive features of the syndrome. We previously reported that brothers of affected women have elevated circulating dehydroepiandrosterone sulfate levels. STUDY DESIGN, SIZE, DURATION This was a case-control study performed in 29 non-Hispanic white brothers of 22 women with PCOS and 18 control men. PARTICIPANTS/MATERIALS, SETTING, METHODS PCOS brothers and control men were of comparable age, weight and ethnicity. Adrenocorticotrophic hormone (ACTH) and GnRH agonist stimulation tests were performed. Gonadotrophin responses to GnRH agonist as well as changes in precursor-product steroid pairs (delta, Δ) across steroidogenic pathways in response to ACTH and GnRH agonist were examined. MAIN RESULTS AND THE ROLE OF CHANCE Basal total (T) levels did not differ, but dehydroepiandrosterone (DHEA) levels (0.13 ± 0.08 brothers versus 0.22 ± 0.09 controls, nmol/l, P = 0.03) were lower in brothers compared with control men. ACTH-stimulated Δ17-hydroxypregnenolone (17Preg)/Δ17-hydroxyprogesterone (17Prog) (7.8 ± 24.2 brothers versus 18.9 ± 21.3 controls, P = 0.04) and ΔDHEA/Δandrostenedione (AD) (0.10 ± 0.05 brothers versus 0.14 ± 0.08 controls, P = 0.04) were lower in brothers than in the controls. GnRH agonist-stimulated Δ17Prog/ΔAD (0.28 ± 8.47 brothers versus 4.79 ± 10.28 controls, P = 0.003) was decreased and luteinizing hormone (38.6 ± 20.6 brothers versus 26.0 ± 9.8 controls, IU/l, P = 0.02), follicle-stimulating hormone (10.2 ± 7.5 brothers versus 4.8 ± 4.1 controls, IU/l P = 0.002), AD (1.7 ± 1.4 brothers versus 0.9 ± 1.5 controls, nmol/l, P = 0.02) and ΔAD/ΔT (0.16 ± 0.14 brothers versus 0.08 ± 0.12 controls, P = 0.005) responses were increased in brothers compared with controls. LIMITATIONS, REASONS FOR CAUTION The modest sample size may have limited our ability to observe other possible differences in steroidogenesis between PCOS brothers and control men. WIDER IMPLICATIONS OF THE FINDINGS Decreased ACTH-stimulated Δ17Preg/Δ17Prog and ΔDHEA/ΔAD responses suggested increased adrenal 3β-hydroxysteroid dehydrogenase activity in the brothers. Decreased Δ17Prog/ΔAD and increased ΔAD/ΔT responses to GnRH agonist stimulation suggested increased gonadal 17,20-lyase and decreased gonadal 17β-hydroxysteroid dehydrogenase activity in the brothers. Increased LH and FSH responses to GnRH agonist stimulation suggested neuroendocrine alterations in the regulation of gonadotrophin secretion similar to those in their proband sisters. These changes in PCOS brothers may reflect the impact of PCOS susceptibility genes and/or programming effects of the intrauterine environment. STUDY FUNDING/COMPETING INTERESTS This research was supported by P50 HD044405 (A.D.), K12 HD055884 (L.C.T.), U54 HD034449 (A.D., R.S.L.) from the National Institute of Child Health and Development. Some hormone assays were performed at the University of Virginia Center for Research in Reproduction Ligand Assay and Analysis Core that is supported by U54 HD28934 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development. Partial support for some of the clinical studies was provided by UL1 RR025741 and UL1 TR000150 (Northwestern University Clinical and Translational Sciences Institute) from the National Center for Research Resources, National Institutes of Health, which is now the National Center for Advancing Translational Sciences. The authors have no conflict of interest to declare.
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Affiliation(s)
- D M Liu
- Division of Endocrinology, Metabolism and Molecular Medicine, Northwestern University, Chicago, IL 60611, USA
| | - L C Torchen
- Division of Endocrinology, Ann & Robert H Lurie Children's Hospital of Chicago, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Y Sung
- Division of Endocrinology, Ewha Womans University College of Medicine, Seoul, 158-710, Korea
| | - R Paparodis
- Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI 53705, USA
| | - R S Legro
- Department of Obstetrics and Gynecology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - S K Grebe
- Department of Laboratory Medicine and Pathology and Department of Medicine, Mayo Clinic and Foundation, Rochester, MN 55905, USA
| | - R J Singh
- Department of Laboratory Medicine and Pathology, Mayo Clinic and Foundation, Rochester, MN 55905, USA
| | - R L Taylor
- Department of Laboratory Medicine and Pathology, Mayo Clinic and Foundation, Rochester, MN 55905, USA
| | - A Dunaif
- Division of Endocrinology, Metabolism and Molecular Medicine, Northwestern University, Chicago, IL 60611, USA
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Chen Y, Hsieh F, Hsieh Y, Jeng J, Lien L, Lin H, Hu C, Peng G, Chern C, Chen C, Tang S, Chi N, Sung Y, Chiou H. Significant association between genetic polymorphisms of gckr and glut1, and ischemic stroke. Atherosclerosis 2014. [DOI: 10.1016/j.atherosclerosis.2014.05.203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Ham W, Park S, Lee S, Kim T, Cho W, Kim D, Sung Y, Yu H, Cho K. MP-09.12 Prostatic Urethral Angulation Can Predict Urinary Flow Rate and Urinary Symptom Score in Men With Lower Urinary Tract Symptom. Urology 2011. [DOI: 10.1016/j.urology.2011.07.214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Lee KJ, Moussa CEH, Lee Y, Sung Y, Howell BW, Turner RS, Pak DTS, Hoe HS. Beta amyloid-independent role of amyloid precursor protein in generation and maintenance of dendritic spines. Neuroscience 2010; 169:344-56. [PMID: 20451588 DOI: 10.1016/j.neuroscience.2010.04.078] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2010] [Revised: 04/28/2010] [Accepted: 04/30/2010] [Indexed: 10/19/2022]
Abstract
Synapse loss induced by amyloid beta (Abeta) is thought to be a primary contributor to cognitive decline in Alzheimer's disease. Abeta is generated by proteolysis of amyloid precursor protein (APP), a synaptic receptor whose physiological function remains unclear. In the present study, we investigated the role of APP in dendritic spine formation, which is known to be important for learning and memory. We found that overexpression of APP increased spine number, whereas knockdown of APP reduced spine density in cultured hippocampal neurons. This spine-promoting effect of APP required both the extracellular and intracellular domains of APP, and was accompanied by specific upregulation of the GluR2, but not the GluR1, subunit of AMPA receptors. In an in vivo experiment, we found that cortical layers II/III and hippocampal CA1 pyramidal neurons in 1 year-old APP-deficient mice had fewer and shorter dendritic spines than wild-type littermates. In contrast, transgenic mice overexpressing mutant APP exhibited increased spine density compared to control animals, though only at a young age prior to overaccumulation of soluble amyloid. Additionally, increased glutamate synthesis was observed in young APP transgenic brains, whereas glutamate levels were decreased and GABA levels were increased in APP-deficient mice. These results demonstrate that APP is important for promoting spine formation and is required for proper spine development.
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Affiliation(s)
- K J Lee
- Department of Pharmacology, Georgetown University Medical Center, 3900 Reservoir Road NW, Washington, DC 20057-1464, USA
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Roh SW, Nam YD, Chang HW, Kim KH, Sung Y, Kim MS, Oh HM, Bae JW. Haloterrigena jeotgali sp. nov., an extremely halophilic archaeon from salt-fermented food. Int J Syst Evol Microbiol 2009; 59:2359-63. [DOI: 10.1099/ijs.0.008243-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Ou J, Chang C, Sung Y, Ou K, Tseng C, Ling H, Ger M. Uniform polystyrene microspheres decorated with noble metal nanoparticles formed without using extra reducing agent. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2007.04.038] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Schneider E, Bolo NR, Frederick B, Wilkinson S, Hirashima F, Nassar L, Lyoo IK, Koch P, Jones S, Hwang J, Sung Y, Villafuerte RA, Maier G, Hsu R, Hashoian R, Renshaw PF. Magnetic resonance spectroscopy for measuring the biodistribution and in situ in vivo pharmacokinetics of fluorinated compounds: validation using an investigation of liver and heart disposition of tecastemizole. J Clin Pharm Ther 2006; 31:261-73. [PMID: 16789992 DOI: 10.1111/j.1365-2710.2006.00735.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND OBJECTIVE The study of biodistribution and in situ pharmacokinetics is a challenging, but sometimes very important, aspect of premarketing characterization of drugs. We aimed to develop a non-invasive fluorine magnetic resonance (MR) spectroscopic method for the absolute quantitation of a mono-fluorinated compound and of its metabolites in the heart and liver of healthy subjects for this purpose. METHOD We used fluorine MR spectroscopy (MRS) at 4 T (Tesla) and external standardization in an open label multiple-dose study. Twenty-three healthy adult subjects were enrolled in the study. The surface coil localized fluorine MR spectrum was monitored in the heart and liver at baseline and after oral administration of multiple doses of tecastemizole. Steady-state measurements were made at set time points that depended upon dose, and washout measurements were made only on subjects in which in vivo fluorine signal was observed. RESULTS AND DISCUSSION At 4 T, under the given experimental conditions, the method had a lower limit of quantitation (LLOQ) of about 2.6 microm and a limit of detection (LOD) of about 0.3 microm for solution state samples (linewidth approximately 15 Hz). The measurement reproducibility was 6.4% using a 50 microm phantom. The effect of MR operator and spectral analyst on the calculated calibration curve slope was small, with inter-rater correlation coefficients of 0.999 and 0.998 respectively. MR signal from fluorine-containing tecastemizole-related moieties was observed in situ only at day 8 in the liver of three of five subjects dosed at 270 mg/day. The average in situ concentration was estimated to be 58+/-22 microm, with an average test-retest reproducibility of 216%. Extrapolating the in vitro results to human measurements, with an approximate linewidth of 250 Hz, predicts in situ LOD and LLOQ values of approximately 6 and 44 microm respectively. However, the human study had a fluorine MRS LOD of approximately 20 microm. The decrease in sensitivity and the increase in variability of the in vivo, in situ measurements compared with the validation study most likely arose from coil placement and incomplete rephasing of the MR signal by the respiratory phase compensation method. CONCLUSION The measured concentrations were the lowest ever recorded for a multi-dose exogenous mono-fluorinated compound in the human liver using a validated fluorine MR quantitation method. The proposed non-invasive MR method for studying the biodistribution and in situ pharmacokinetics of mono-fluorinated compounds in the liver and heart should have broader application to the development of non-invasive biomarkers.
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Kim S, Vertessy RA, Perraud JM, Sung Y. Integration and application of the Rainfall Runoff Library. Water Sci Technol 2005; 52:275-82. [PMID: 16445198] [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] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The Rainfall Runoff Library (RRL) provides a convenient platform for implementing environment modelling components such as rainfall runoff models, calibration tools, and objective functions. A rainfall-runoff model widely known and used in South Korea, TANK, is added to the RRL, and used along with the models AWBM and SIMHYD to reproduce the historical time series of daily and monthly runoff at the Soyanggang Dam and Youngcheon Dam catchments located in South Korea. The features of the RRL allow for an easy comparison of different models in a standardised and common framework. Three optimisation methods (Genetic algorithm, Rosenbrock method and Shuffled Complex Evolution algorithm) were applied to calibrate the model parameters using three different objective functions. The applicability of each model to these catchments is discussed based on the resulting statistics.
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Affiliation(s)
- S Kim
- Dept. of Environ. Eng., Pusan National University, San 30, Jangjundong, Gumjunggu, Pusan, Republic of Korea, 609-735.
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Yang SS, Chen CY, Sung Y, Lin YT. Effect of moisture content on the microbial activity in JP-5 fuel oil. Zhonghua Min Guo Wei Sheng Wu Ji Mian Yi Xue Za Zhi 1992; 25:223-31. [PMID: 1342639] [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] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The water solubility of JP-5 fuel oil was found to be proportional to the reciprocal of absolute temperature from 0 degree C to 60 degrees C. Water in the fuel oil would become condensed once the temperature was shifted from a high temperature to low temperature. During the storage, condensed water was precipitated in the bottom of the tank. Both the static and the dynamic dehumidification processes with molecular sieve could reduce the moisture content of fuel oil to less than 5 ppm. However, pre-dried fuel oil had a mildly hydroscopic phenomenon at relatively high humidity condition. The spores of contaminated microbes could survive in the fuel oil with 5 to 80 ppm of moisture content. High moisture content of fuel oil was not favorable to the spore survival. Penicillium sp. could survive in the fuel oil longer than Cladosporium resinae.
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Affiliation(s)
- S S Yang
- Department of Agricultural Chemistry, National Taiwan University, Taipei, ROC
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Abstract
Hypothermia may contribute to serious life-threatening infections. An experimental model has been established in pigs in order to study the effects of hypothermia on host bacterial defenses. The function of blood neutrophils from pigs and humans was examined in vitro at 37 and 29 degrees C. Bacterial killing of Staphylococcus aureus 502A by human neutrophils after 90 and 180 min incubation at 29 degrees C was reduced to 76 +/- 6% and 83 +/- 7% of killing at 37 degrees C. Porcine neutrophil killing was similarly reduced at 90 min (72 +/- 9%) and remained significantly impaired after 180 min (52 +/- 11%). Phagocytosis of ORO-DP-LPS particles by human neutrophils after 5 min at 29 degrees C was 40 +/- 5% of that at 37 degrees C and only 55 +/- 7% after 15 min by which time maximum phagocytosis had occurred at 37 degrees C. Porcine neutrophils ingested significantly less ORO (68 +/- 8%) after 5 min at 29 degrees C and reached normal values by 15 min. Stimulation of hexose monophosphate pathway in human neutrophils for 20 min at 29 degrees C was only 13 +/- 5% of that at 37 degrees C and required 2 h of stimulation to reach normal values. Porcine cells were reduced to 74 +/- 9% after 20 min incubation and reached normal values by 30 min. Directed neutrophil migration as assessed under agarose was impaired for both human (39 +/- 6%) and porcine (20 +/- 4%) neutrophils at 29 degrees C compared to 37 degrees C.(ABSTRACT TRUNCATED AT 250 WORDS)
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Sung Y, Koike K, Nikaido T, Ohmoto T, Sankawa U. Inhibitors of cyclic AMP phosphodiesterase in Picrasma quassioides Bennet, and inhibitory activities of related beta-carboline alkaloids. Chem Pharm Bull (Tokyo) 1984; 32:1872-7. [PMID: 6088097 DOI: 10.1248/cpb.32.1872] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Nikaido T, Sung Y, Ohmoto T, Sankawa U. Inhibitors of cyclic adenosine 3',5'-monophosphate phosphodiesterase in Phyllostachys nigra Munro var. henonis Stapf. and Phragmites communis Trin., and inhibition by related compounds. Chem Pharm Bull (Tokyo) 1984; 32:578-84. [PMID: 6329531 DOI: 10.1248/cpb.32.578] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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