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Jin H, Ji Y, An J, Ha DH, Lee YR, Kim HJ, Lee CG, Jeong W, Kwon IC, Yang EG, Kim KH, Lee C, Chung HS. Engineering Escherichia coli for constitutive production of monophosphoryl lipid A vaccine adjuvant. Biotechnol Bioeng 2024; 121:1144-1162. [PMID: 38184812 DOI: 10.1002/bit.28638] [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: 10/05/2023] [Revised: 11/14/2023] [Accepted: 12/12/2023] [Indexed: 01/08/2024]
Abstract
During the COVID-19 pandemic, expedient vaccine production has been slowed by the shortage of safe and effective raw materials, such as adjuvants, essential components to enhance the efficacy of vaccines. Monophosphoryl lipid A (MPLA) is a potent and safe adjuvant used in human vaccines, including the Shingles vaccine, Shingrix. 3-O-desacyl-4'-monophosphoryl lipid A (MPL), a representative MPLA adjuvant commercialized by GSK, was prepared via chemical conversion of precursors isolated from Salmonella typhimurium R595. However, the high price of these materials limits their use in premium vaccines. To combat the scarcity and high cost of safe raw materials for vaccines, we need to develop a feasible MPLA production method that is easily scaled up to meet industrial requirements. In this study, we engineered peptidoglycan and outer membrane biosynthetic pathways in Escherichia coli and developed a Escherichia coli strain, KHSC0055, that constitutively produces EcML (E. coli-produced monophosphoryl lipid A) without additives such as antibiotics or overexpression inducers. EcML production was optimized on an industrial scale via high-density fed-batch fermentation, and obtained 2.7 g of EcML (about 135,000 doses of vaccine) from a 30-L-scale fermentation. Using KHSC0055, we simplified the production process and decreased the production costs of MPLA. Then, we applied EcML purified from KHSC0055 as an adjuvant for a COVID-19 vaccine candidate (EuCorVac-19) currently in clinical trial stage III in the Philippines. By probing the efficacy and safety of EcML in humans, we established KHSC0055 as an efficient cell factory for MPLA adjuvant production.
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Affiliation(s)
- Hyunjung Jin
- Chemical and Biological Integrative Research Center, Biomedical Research Division, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Yuhyun Ji
- Chemical and Biological Integrative Research Center, Biomedical Research Division, Korea Institute of Science and Technology, Seoul, Republic of Korea
- Department of Life Sciences, Korea University, Seoul, Republic of Korea
| | - Jinsu An
- Chemical and Biological Integrative Research Center, Biomedical Research Division, Korea Institute of Science and Technology, Seoul, Republic of Korea
- Division of Bio-Medical Science & Technology, KIST School, Korea National University of Science and Technology, Seoul, Republic of Korea
| | - Da Hui Ha
- V Plant 125, Wonmudong-gil, Dongsan-myeon, EuBiologics., Co., Ltd., Chuncheon-si, Gangwon-do, Republic of Korea
| | - Ye-Ram Lee
- V Plant 125, Wonmudong-gil, Dongsan-myeon, EuBiologics., Co., Ltd., Chuncheon-si, Gangwon-do, Republic of Korea
| | - Hye-Ji Kim
- V Plant 125, Wonmudong-gil, Dongsan-myeon, EuBiologics., Co., Ltd., Chuncheon-si, Gangwon-do, Republic of Korea
| | - Choon Geun Lee
- V Plant 125, Wonmudong-gil, Dongsan-myeon, EuBiologics., Co., Ltd., Chuncheon-si, Gangwon-do, Republic of Korea
| | - Wooyeon Jeong
- Doping Control Center, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Ick Chan Kwon
- Medicinal Materials Research Center, Biomedical Research Division, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Eun Gyeong Yang
- Biomedical Research Division, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Ki Hun Kim
- Doping Control Center, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Chankyu Lee
- V Plant 125, Wonmudong-gil, Dongsan-myeon, EuBiologics., Co., Ltd., Chuncheon-si, Gangwon-do, Republic of Korea
| | - Hak Suk Chung
- Chemical and Biological Integrative Research Center, Biomedical Research Division, Korea Institute of Science and Technology, Seoul, Republic of Korea
- Division of Bio-Medical Science & Technology, KIST School, Korea National University of Science and Technology, Seoul, Republic of Korea
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Kim SJ, Kang HR, Lee CG, Choi SH, Kim YW, Lee HW, Lee CH. Pulmonary sclerosing pneumocytoma and mortality risk. BMC Pulm Med 2022; 22:404. [DOI: 10.1186/s12890-022-02199-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 10/05/2022] [Indexed: 11/09/2022] Open
Abstract
Abstract
Background
Surgical resection is usually recommended for the treatment of pulmonary sclerosing pneumocytoma (PSP). However, no comparative study has demonstrated that surgical resection leads to improved outcomes. We aimed to compare all-cause mortality between patients with PSP who underwent surgery or did not and those without PSP.
Methods
Participants aged ≥18 years who had pathologically diagnosed PSP between 2001 to 2018, at 3 hospitals were included. Randomly selected (up to 1:5) age-, sex-, and smoking status-matched controls without PSP who were randomly selected from those who underwent health checkups including chest CT were included. Mortality was compared using Kaplan–Meier estimates and Cox proportional hazards regression models. Literature review of studies reporting PSP was also conducted.
Results
This study included 107 patients with PSP (surgery:non-surgery, 80:27) and 520 matched controls. There were no cases of lymph node or distant metastasis, recurrence, or mortality from PSP. No significant difference in all-cause mortality risk was observed between the PSP surgery, PSP non-surgery, and non-PSP groups (log rank test P = 0.78) (PSP surgery vs. non-PSP: adjusted hazards ratio [aHR], 1.80; 95% confidence interval [CI], 0.22–14.6; PSP non-surgery vs. non-PSP: aHR, 0.77; 95% CI, 0.15–3.86; PSP surgery vs. PSP non-surgery: aHR, 2.35; 95% CI, 0.20–28.2). In the literature review, we identified 3469 patients with PSP from 355 studies. Only 1.33% of these patients reported metastasis, recurrence, or death.
Conclusions
All-cause mortality did not differ between patients with PSP and those without, irrespective of undergoing surgery. Our study and the literature review suggest that PSP has less impact on increased mortality risk.
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Nguyen QT, Kim E, Yang J, Lee C, Ha DH, Lee CG, Lee YR, Poo H. E. coli-Produced Monophosphoryl Lipid a Significantly Enhances Protective Immunity of Pandemic H1N1 Vaccine. Vaccines (Basel) 2020; 8:vaccines8020306. [PMID: 32560094 PMCID: PMC7350214 DOI: 10.3390/vaccines8020306] [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: 05/08/2020] [Revised: 06/04/2020] [Accepted: 06/11/2020] [Indexed: 11/16/2022] Open
Abstract
Emerging influenza viruses pose an extreme global risk to human health, resulting in an urgent need for effective vaccination against influenza infection. Adjuvants are vital components that can improve vaccine efficacy, yet only a few adjuvants have been licensed in human vaccines. Here, we investigate the adjuvant effects of Escherichia coli-produced monophosphoryl lipid A (MPL), named EcML, in enhancing the immunogenicity and efficacy of an influenza vaccine. Similar to MPL, EcML activated dendritic cells and enhanced the antigen processing of cells in vitro. Using ovalbumin (OVA) as a model antigen, EcML increased OVA-specific antibody production, cytotoxic T lymphocyte activity. The safety of EcML was demonstrated as being similar to that of MPL by showing not significant in vitro cell cytotoxicity but transient systemic inflammatory responses within 24 h in OVA immunized mice. Importantly, mice vaccinated with pandemic H1N1 (pH1N1) vaccine antigen, combined with EcML, were fully protected from pH1N1 virus infection by enhanced influenza-specific antibody titers, hemagglutination inhibition titers, and IFN-γ- secreting cells. Taken together, our results strongly suggest that EcML might be a promising vaccine adjuvant for preventing influenza virus infection.
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Affiliation(s)
- Quyen Thi Nguyen
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Korea; (Q.T.N.); (E.K.); (J.Y.)
- Department of Biosystems and Bioengineering, KRIBB School of Biotechnology, University of Science and Technology, Daejeon 34113, Korea
| | - Eunjin Kim
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Korea; (Q.T.N.); (E.K.); (J.Y.)
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Jihyun Yang
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Korea; (Q.T.N.); (E.K.); (J.Y.)
| | - Chankyu Lee
- Eubiologics. Co., Ltd., V Plant, Gangwon-do 24410, Korea; (C.L.); (D.H.H.); (C.G.L.); (Y.R.L.)
| | - Da Hui Ha
- Eubiologics. Co., Ltd., V Plant, Gangwon-do 24410, Korea; (C.L.); (D.H.H.); (C.G.L.); (Y.R.L.)
| | - Choon Geun Lee
- Eubiologics. Co., Ltd., V Plant, Gangwon-do 24410, Korea; (C.L.); (D.H.H.); (C.G.L.); (Y.R.L.)
| | - Ye Ram Lee
- Eubiologics. Co., Ltd., V Plant, Gangwon-do 24410, Korea; (C.L.); (D.H.H.); (C.G.L.); (Y.R.L.)
| | - Haryoung Poo
- Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Korea; (Q.T.N.); (E.K.); (J.Y.)
- Department of Biosystems and Bioengineering, KRIBB School of Biotechnology, University of Science and Technology, Daejeon 34113, Korea
- Correspondence: ; Tel.: +82-42-860-4157
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Fink HA, Litwack-Harrison S, Taylor BC, Bauer DC, Orwoll ES, Lee CG, Barrett-Connor E, Schousboe JT, Kado DM, Garimella PS, Ensrud KE. Erratum to: Clinical utility of routine laboratory testing to identify possible secondary causes in older men with osteoporosis: the osteoporotic fractures in men (MrOS) study. Osteoporos Int 2017; 28:419-420. [PMID: 27766366 PMCID: PMC5262150 DOI: 10.1007/s00198-016-3805-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- H A Fink
- Geriatric Research Education & Clinical Center, Minneapolis VA, Health Care System, One Veterans Drive, 11-G, Minneapolis, MN, 55417, USA.
| | - S Litwack-Harrison
- Department of Epidemiology & Statistics, University of California, San Francisco, San Francisco Coordinating Center, Mission Hall: Global Health & Clinical Sciences Building, 550 16th Street, 2nd, floor, Box, San Francisco, CA, #0560, USA
| | - B C Taylor
- Center for Chronic Disease Outcomes Research, Minneapolis VA Health Care System, One Veterans Drive, Mail code 152, Building 9, Minneapolis, MN, 55417, USA
| | - D C Bauer
- Department of Medicine, University of California, San Francisco, 1545 Divisadero St, 3rd Floor, San Francisco, CA, USA
| | - E S Orwoll
- Bone & Mineral Unit, Department of Medicine, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, CR113, Portland, OR, 97239, USA
| | - C G Lee
- Portland Veterans Affairs HealthCareSystem, 3710SWUSVeterans Hospital Rd, R&D45, Portland, OR, 97239, USA
| | - E Barrett-Connor
- Department of Family Medicine & Public Health, University of California, San Diego 9500 Gilman Drive, La Jolla, CA, 92093, USA
| | - J T Schousboe
- Health Research Center, Park Nicollet Institute for Research and Education, 3800 Park Nicollet Boulevard, Minneapolis, MN, 55416, USA
| | - D M Kado
- Department of Family Medicine & Public Health, University of California, San Diego 9500 Gilman Drive, La Jolla, CA, 92093, USA
| | - P S Garimella
- Division of Nephrology, Tufts Medical Center, 800 Washington, Street, Box 391, Boston, MA, 02111, USA
| | - K E Ensrud
- Division of General Internal Medicine, Minneapolis VA Health Care System, One Veterans Drive, 111-0, Minneapolis, MN, 55417, USA
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Yang KY, Kim MJ, Ju JS, Park SK, Lee CG, Kim ST, Bae YC, Ahn DK. Antinociceptive Effects of Botulinum Toxin Type A on Trigeminal Neuropathic Pain. J Dent Res 2016; 95:1183-90. [PMID: 27418174 DOI: 10.1177/0022034516659278] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [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: 12/19/2022] Open
Abstract
Previous studies have demonstrated that botulinum toxin type A (BoNT-A) attenuates orofacial nociception. However, there has been no evidence of the participation of the voltage-gated sodium channels (Navs) in the antinociceptive mechanisms of BoNT-A. This study investigated the cellular mechanisms underlying the antinociceptive effects of BoNT-A in a male Sprague-Dawley rat model of trigeminal neuropathic pain produced by malpositioned dental implants. The left mandibular second molar was extracted under anesthesia, followed by a miniature dental implant placement to induce injury to the inferior alveolar nerve. Mechanical allodynia was monitored after subcutaneous injection of BoNT-A at 3, 7, or 12 d after malpositioned dental implant surgery. Subcutaneous injections of 1 or 3 U/kg of BoNT-A on postoperative day 3 significantly attenuated mechanical allodynia, although 0.3 U/kg of BoNT-A did not affect the air-puff threshold. A single injection of 3 U/kg of BoNT-A produced prolonged antiallodynic effects over the entire experimental period. Treatment with BoNT-A on postoperative days 7 and 12, when pain had already been established, also produced prolonged antiallodynic effects. Double treatments with 1 U/kg of BoNT-A produced prolonged, more antiallodynic effects as compared with single treatments. Subcutaneous administration of 3 U/kg of BoNT-A significantly inhibited the upregulation of Nav isoform 1.7 (Nav1.7) expression in the trigeminal ganglion in the nerve-injured animals. These results suggest that antinociceptive effects of BoNT-A are mediated by an inhibition of upregulated Nav1.7 expression in the trigeminal ganglion. BoNT-A is therefore a potential new therapeutic agent for chronic pain control, including neuropathic pain.
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Affiliation(s)
- K Y Yang
- Department of Oral Physiology, School of Dentistry, Kyungpook National University, Daegu, Korea
| | - M J Kim
- Department of Oral Physiology, School of Dentistry, Kyungpook National University, Daegu, Korea
| | - J S Ju
- Department of Oral Physiology, School of Dentistry, Kyungpook National University, Daegu, Korea
| | - S K Park
- Department of Oral Physiology, School of Dentistry, Kyungpook National University, Daegu, Korea
| | - C G Lee
- Research and Development Division, Hugel, Inc., Chuncheon, Korea
| | - S T Kim
- Department of Orofacial Pain and Oral Medicine, School of Dentistry, Yonsei University, Seoul, Korea
| | - Y C Bae
- Department of Oral Anatomy, School of Dentistry, Kyungpook National University, Daegu, Korea
| | - D K Ahn
- Department of Oral Physiology, School of Dentistry, Kyungpook National University, Daegu, Korea
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Lee CG, Kim JW, Park J, Park YI, Hwang YJ, Park JK. Determination of Mode of Chitosanase Action by Matrix Associated Laser Desorption Ionization - Time of Flight Mass Spectrometry Analysis. ACTA ACUST UNITED AC 2016. [DOI: 10.17642/jcc.21.2.5] [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: 11/12/2022]
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Lee CG, Koo JC, Park JK. Antifungal Effect of Chitosan as Ca(2+) Channel Blocker. Plant Pathol J 2016; 32:242-250. [PMID: 27298599 PMCID: PMC4892820 DOI: 10.5423/ppj.oa.08.2015.0162] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 02/06/2016] [Accepted: 02/15/2016] [Indexed: 06/06/2023]
Abstract
The aim of this study was to investigate antifungal activity of a range of different molecular weight (MW) chitosan against Penicillium italicum. Our results demonstrate that the antifungal activity was dependent both the MW and concentration of the chitosan. Among a series of chitosan derived from the hydrolysis of high MW chitosan, the fractions containing various sizes of chitosan ranging from 3 to 15 glucosamine units named as chitooligomers-F2 (CO-F2) was found to show the highest antifungal activity against P. italicum. Furthermore, the effect of CO-F2 toward this fungus was significantly reduced in the presence of Ca(2+), whereas its effect was recovered by ethylenediaminetetraacetic acid, suggesting that the CO-F2 acts via disruption of Ca(2+) gradient required for survival of the fungus. Our results suggest that CO-F2 may serve as potential compounds to develop alternatives to synthetic fungicides for the control of the postharvest diseases.
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Affiliation(s)
- Choon Geun Lee
- Department of Life Science, College of BioNano, Gachon University, Seongnam 13120,
Korea
| | - Ja Choon Koo
- Division of Science Education and Institute of Fusion Science, Chonbuk National University, Jeonju 54896,
Korea
| | - Jae Kweon Park
- Department of Life Science, College of BioNano, Gachon University, Seongnam 13120,
Korea
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Vock C, Yildirim AÖ, Wagner C, Schlick S, Lunding LP, Lee CG, Elias JA, Fehrenbach H, Wegmann M. Distal airways are protected from goblet cell metaplasia by diminished expression of IL-13 signalling components. Clin Exp Allergy 2016; 45:1447-58. [PMID: 25772331 DOI: 10.1111/cea.12526] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Revised: 02/19/2015] [Accepted: 02/25/2015] [Indexed: 01/15/2023]
Abstract
BACKGROUND Increased mucus production is a critical factor impairing lung function in patients suffering from bronchial asthma, the most common chronic inflammatory lung disease worldwide. OBJECTIVE This study aimed at investigating whether goblet cell (GC) metaplasia and mucus production are differentially regulated in proximal and distal airways. METHODS Female Balb/c mice were sensitized to ovalbumin (OVA) and challenged with an OVA-aerosol on two consecutive days for 1 week (acute) or 12 weeks (chronic). Real-time RT-PCR analysis was applied on microdissected airways. RESULTS In acutely and chronically OVA-challenged mice, GC metaplasia and mucus production were observed in proximal but not in distal airways. In contrast, inflammation reflected by the infiltration of eosinophils and expression of the TH2-type cytokines IL-4 and IL-13 was increased in both proximal and distal airways. Abundance of IL-13Rα1 was lower in distal airways of healthy control mice. Under acute and chronic OVA-exposure, activation of IL-13Rα1-dependent signalling cascade, reflected by Spdef and Foxo3A transcription factors, was attenuated in distal compared to proximal airways. CONCLUSION AND CLINICAL RELEVANCE These data indicate that distal airways might be less sensitive to IL-13-induced GC metaplasia and mucus production through lower expression of IL-13Rα1 and attenuated activation of downstream signalling. This might represent a protective strategy to prevent mucus plugging of distal airways and thus impaired ventilation of attached alveoli.
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Affiliation(s)
- C Vock
- Division of Experimental Pneumology, Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), German Center for Lung Research, Borstel, Germany
| | - A Ö Yildirim
- Comprehensive Pneumology Center, Institute of Lung Biology and Disease, Helmholtz Zentrum München, German Center for Lung Research, Neuherberg, Germany
| | - C Wagner
- Division of Invertebrate Models, Priority Area Asthma & Allergy, Research Center Borstel, Borstel, Germany
| | - S Schlick
- Division of Experimental Pneumology, Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), German Center for Lung Research, Borstel, Germany
| | - L P Lunding
- Division of Asthma Mouse Models, Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), German Center for Lung Research, Borstel, Germany
| | - C G Lee
- Frank L. Day Professor of Biology, Warren Alpert School of Medicine, Brown University, Providence, RI, USA
| | - J A Elias
- Frank L. Day Professor of Biology, Warren Alpert School of Medicine, Brown University, Providence, RI, USA
| | - H Fehrenbach
- Division of Experimental Pneumology, Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), German Center for Lung Research, Borstel, Germany
| | - M Wegmann
- Division of Asthma Mouse Models, Priority Area Asthma & Allergy, Research Center Borstel, Airway Research Center North (ARCN), German Center for Lung Research, Borstel, Germany
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Fink HA, Litwack-Harrison S, Taylor BC, Bauer DC, Orwoll ES, Lee CG, Barrett-Connor E, Schousboe JT, Kado DM, Garimella PS, Ensrud KE. Clinical utility of routine laboratory testing to identify possible secondary causes in older men with osteoporosis: the Osteoporotic Fractures in Men (MrOS) Study. Osteoporos Int 2016; 27:331-8. [PMID: 26458388 PMCID: PMC4719570 DOI: 10.1007/s00198-015-3356-y] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 09/29/2015] [Indexed: 11/25/2022]
Abstract
UNLABELLED We investigated the value of routine laboratory testing for identifying underlying causes in older men diagnosed with osteoporosis. Most osteoporotic and nonosteoporotic men had ≥1 laboratory abnormality. Few individual laboratory abnormalities were more common in osteoporotic men. The benefit of routine laboratory testing in older osteoporotic men may be low. INTRODUCTION To evaluate the utility of recommended laboratory testing to identify secondary causes in older men with osteoporosis, we examined prevalence of laboratory abnormalities in older men with and without osteoporosis. METHODS One thousand five hundred seventy-two men aged ≥65 years in the Osteoporotic Fractures in Men study completed bone mineral density (BMD) testing and a battery of laboratory measures, including serum calcium, phosphorus, alkaline phosphatase, parathyroid hormone (PTH), thyroid-stimulating hormone (TSH), 25-OH vitamin D, total testosterone, spot urine calcium/creatinine ratio, spot urine albumin/creatinine ratio, creatinine-derived estimated glomerular filtration rate, 24-h urine calcium, and 24-h urine free cortisol. Using cross-sectional analyses, we calculated prevalence ratios (PRs) and 95 % confidence intervals (CI) for the association of any and specific laboratory abnormalities with osteoporosis and the number of men with osteoporosis needed to test to identify one additional laboratory abnormality compared to testing men without osteoporosis. RESULTS Approximately 60 % of men had ≥1 laboratory abnormality in both men with and without osteoporosis. Among individual tests, only vitamin D insufficiency (PR, 1.13; 95 % CI, 1.05-1.22) and high alkaline phosphatase (PR, 3.05; 95 % CI, 1.52-6.11) were more likely in men with osteoporosis. Hypercortisolism and hyperthyroidism were uncommon and not significantly more frequent in men with osteoporosis. No osteoporotic men had hypercalciuria. CONCLUSIONS Though most of these older men had ≥1 laboratory abnormality, few routinely recommended individual tests were more common in men with osteoporosis than in those without osteoporosis. Possibly excepting vitamin D and alkaline phosphatase, benefit of routine laboratory testing to identify possible secondary causes in older osteoporotic men appears low. Results may not be generalizable to younger men or to older men in whom history and exam findings raise clinical suspicion for a secondary cause of osteoporosis.
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Affiliation(s)
- H A Fink
- Geriatric Research Education & Clinical Center, Minneapolis VA Health Care System, One Veterans Drive, 11-G, Minneapolis, MN, 55417, USA.
| | - S Litwack-Harrison
- Department of Epidemiology & Statistics, University of California, San Francisco, San Francisco Coordinating Center, Mission Hall: Global Health & Clinical Sciences Building, 550 16th Street, 2nd floor, Box #0560, San Francisco, CA, USA
| | - B C Taylor
- Center for Chronic Disease Outcomes Research, Minneapolis VA Health Care System, One Veterans Drive, Mail code 152, Building 9, Minneapolis, MN, 55417, USA
| | - D C Bauer
- Department of Medicine, University of California, San Francisco, 1545, Divisadero St, 3rd Floor, San Francisco, CA, USA
| | - E S Orwoll
- Bone & Mineral Unit, Department of Medicine, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, CR113, Portland, OR, 97239, USA
| | - C G Lee
- Portland Veterans Affairs Health Care System, 3710 SW US Veterans Hospital Rd, R&D45, Portland, OR, 97239, USA
| | - E Barrett-Connor
- Department of Family Medicine & Public Health, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093, USA
| | - J T Schousboe
- Health Research Center, Park Nicollet Institute for Research and Education, 3800 Park Nicollet Boulevard, Minneapolis, MN, 55416, USA
| | - D M Kado
- Department of Family Medicine & Public Health, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093, USA
| | - P S Garimella
- Division of Nephrology, Tufts Medical Center, 800 Washington Street, Box 391, Boston, MA, 02111, USA
| | - K E Ensrud
- Division of General Internal Medicine, Minneapolis VA Health Care System, One Veterans Drive, 111-0, Minneapolis, MN, 55417, USA
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Kim JW, Lee CG, Hwang YJ, Park JK. Active Molecular Chitosan (AMC-S1): Preparation and characterization of Antibacterial Activity. ACTA ACUST UNITED AC 2015. [DOI: 10.17642/jcc.20.4.9] [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: 11/12/2022]
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Son Y, Heo K, Bae MJ, Lee CG, Cho WS, Kim SD, Yang K, Shin IS, Lee MY, Kim JS. Injury to the blood-testis barrier after low-dose-rate chronic radiation exposure in mice. Radiat Prot Dosimetry 2015; 167:316-320. [PMID: 25948832 DOI: 10.1093/rpd/ncv270] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Exposure to ionising radiation induces male infertility, accompanied by increasing permeability of the blood-testis barrier. However, the effect on male fertility by low-dose-rate chronic radiation has not been investigated. In this study, the effects of low-dose-rate chronic radiation on male mice were investigated by measuring the levels of tight-junction-associated proteins (ZO-1 and occludin-1), Niemann-Pick disease type 2 protein (NPC-2) and antisperm antibody (AsAb) in serum. BALB/c mice were exposed to low-dose-rate radiation (3.49 mGy h(-1)) for total exposures of 0.02 (6 h), 0.17 (2 d) and 1.7 Gy (21 d). Based on histological examination, the diameter and epithelial depth of seminiferous tubules were significantly decreased in 1.7-Gy-irradiated mice. Compared with those of the non-irradiated group, 1.7-Gy-irradiated mice showed significantly decreased ZO-1, occludin-1 and NPC-2 protein levels, accompanied with increased serum AsAb levels. These results suggest potential blood-testis barrier injury and immune infertility in male mice exposed to low-dose-rate chronic radiation.
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Affiliation(s)
- Y Son
- Research Center, Dongnam Institute of Radiological and Medical Sciences (DIRAMS), Jwadong-gil 40, Gijang-gun, Busan 619-953, South Korea
| | - K Heo
- Research Center, Dongnam Institute of Radiological and Medical Sciences (DIRAMS), Jwadong-gil 40, Gijang-gun, Busan 619-953, South Korea
| | - M J Bae
- Research Center, Dongnam Institute of Radiological and Medical Sciences (DIRAMS), Jwadong-gil 40, Gijang-gun, Busan 619-953, South Korea
| | - C G Lee
- Research Center, Dongnam Institute of Radiological and Medical Sciences (DIRAMS), Jwadong-gil 40, Gijang-gun, Busan 619-953, South Korea
| | - W S Cho
- Research Center, Dongnam Institute of Radiological and Medical Sciences (DIRAMS), Jwadong-gil 40, Gijang-gun, Busan 619-953, South Korea
| | - S D Kim
- Research Center, Dongnam Institute of Radiological and Medical Sciences (DIRAMS), Jwadong-gil 40, Gijang-gun, Busan 619-953, South Korea
| | - K Yang
- Research Center, Dongnam Institute of Radiological and Medical Sciences (DIRAMS), Jwadong-gil 40, Gijang-gun, Busan 619-953, South Korea
| | - I S Shin
- College of Veterinary Medicine, Chonnam National University, Gwangju, South Korea
| | - M Y Lee
- College of Pharmacy, Kyungpook National University, Daegu, South Korea
| | - J S Kim
- Research Center, Dongnam Institute of Radiological and Medical Sciences (DIRAMS), Jwadong-gil 40, Gijang-gun, Busan 619-953, South Korea College of Veterinary Medicine, Chonnam National University, Gwangju, South Korea
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Lee CG, Park JK. Comparison of inhibitory activity of bioactive molecules on the dextransucrase from Streptococcus mutans. Appl Microbiol Biotechnol 2015; 99:7495-503. [DOI: 10.1007/s00253-015-6693-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 05/08/2015] [Accepted: 05/13/2015] [Indexed: 10/23/2022]
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Li L, Ng DSW, Mah WC, Almeida FF, Rahmat SA, Rao VK, Leow SC, Laudisi F, Peh MT, Goh AM, Lim JSY, Wright GD, Mortellaro A, Taneja R, Ginhoux F, Lee CG, Moore PK, Lane DP. A unique role for p53 in the regulation of M2 macrophage polarization. Cell Death Differ 2014; 22:1081-93. [PMID: 25526089 DOI: 10.1038/cdd.2014.212] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 11/14/2014] [Accepted: 11/17/2014] [Indexed: 12/30/2022] Open
Abstract
P53 is critically important in preventing oncogenesis but its role in inflammation in general and in the function of inflammatory macrophages in particular is not clear. Here, we show that bone marrow-derived macrophages exhibit endogenous p53 activity, which is increased when macrophages are polarized to the M2 (alternatively activated macrophage) subtype. This leads to reduced expression of M2 genes. Nutlin-3a, which destabilizes the p53/MDM2 (mouse double minute 2 homolog) complex, promotes p53 activation and further downregulates M2 gene expression. In contrast, increased expression of M2 genes was apparent in M2-polarized macrophages from p53-deficient and p53 mutant mice. Furthermore, we show, in mice, that p53 also regulates M2 polarization in peritoneal macrophages from interleukin-4-challenged animals and that nutlin-3a retards the development of tolerance to Escherichia coli lipopolysaccharide. P53 acts via transcriptional repression of expression of c-Myc (v-myc avian myelocytomatosis viral oncogene homolog) gene by directly associating with its promoter. These data establish a role for the p53/MDM2/c-MYC axis as a physiological 'brake' to the M2 polarization process. This work reveals a hitherto unknown role for p53 in macrophages, provides further insight into the complexities of macrophage plasticity and raises the possibility that p53-activating drugs, many of which are currently being trialled clinically, may have unforeseen effects on macrophage function.
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Affiliation(s)
- L Li
- p53 Laboratory, A*Star, 8A Biomedical Grove, Immunos, Singapore 138648
| | - D S W Ng
- Neurobiology Program, Life Science Institute and Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - W-C Mah
- Division of Medical Sciences, National Cancer Centre, Singapore and NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore
| | - F F Almeida
- Singapore Immunology Network, A*Star, Singapore
| | - S A Rahmat
- p53 Laboratory, A*Star, 8A Biomedical Grove, Immunos, Singapore 138648
| | - V K Rao
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - S C Leow
- Singapore Institute of Clinical Sciences, A*Star, Singapore
| | - F Laudisi
- Singapore Immunology Network, A*Star, Singapore
| | - M T Peh
- Neurobiology Program, Life Science Institute and Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - A M Goh
- p53 Laboratory, A*Star, 8A Biomedical Grove, Immunos, Singapore 138648
| | - J S Y Lim
- Microscopy Unit, Institute of Medical Biology, A*Star, Singapore
| | - G D Wright
- Microscopy Unit, Institute of Medical Biology, A*Star, Singapore
| | | | - R Taneja
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - F Ginhoux
- Singapore Immunology Network, A*Star, Singapore
| | - C G Lee
- 1] Division of Medical Sciences, National Cancer Centre, Singapore and NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore [2] Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore and Cancer and Stem Cell Biology Program, DUKE-NUS Graduate Medical School, Singapore
| | - P K Moore
- Neurobiology Program, Life Science Institute and Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - D P Lane
- p53 Laboratory, A*Star, 8A Biomedical Grove, Immunos, Singapore 138648
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Liu Y, Chan TCY, Lee CG, Cho YB, Islam MK. TH-A-BRF-02: BEST IN PHYSICS (JOINT IMAGING-THERAPY) - Modeling Tumor Evolution for Adaptive Radiation Therapy. Med Phys 2014. [DOI: 10.1118/1.4889548] [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: 11/07/2022] Open
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15
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Park GY, Han JY, Han YK, Kim SD, Kim JS, Jo WS, Chun SH, Jeong DH, Lee CW, Yang K, Lee CG. 14-3-3 eta depletion sensitizes glioblastoma cells to irradiation due to enhanced mitotic cell death. Cancer Gene Ther 2014; 21:158-63. [DOI: 10.1038/cgt.2014.11] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 02/10/2014] [Accepted: 02/20/2014] [Indexed: 01/07/2023]
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Joo MS, Lee CG, Koo JH, Kim SG. miR-125b transcriptionally increased by Nrf2 inhibits AhR repressor, which protects kidney from cisplatin-induced injury. Cell Death Dis 2013; 4:e899. [PMID: 24176857 PMCID: PMC3920955 DOI: 10.1038/cddis.2013.427] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 09/25/2013] [Accepted: 09/26/2013] [Indexed: 01/04/2023]
Abstract
MicroRNAs (miRNAs) have a role in the cellular defense mechanism. Nuclear factor erythroid-2-related factor 2 (Nrf2) increases antioxidant enzyme capacity. However, miRNA transcriptionally controlled by Nrf2 had been uncharacterized. Here we report that miR-125b is transactivated by Nrf2 and inhibits aryl hydrocarbon receptor (AhR) repressor (AhRR). Bioinformatic approaches enabled us to extract six candidate miRNAs. Of them, only miR-125b was increased in the kidney of mice treated with oltipraz. Nrf2 overexpression enhanced primary, precursor and mature miR-125b levels. Functional assays revealed MIR125B1 is a bona fide target gene of Nrf2. Oltipraz treatment protected the kidney from cisplatin toxicity with increase of miR-125b. Consistently, Nrf2 knockout abrogated an adaptive increase of miR-125b elicited by cisplatin, augmenting kidney injury. An integrative network of miRNA and messenger RNA changes enabled us to predict miR-125b as an inhibitor of AhRR for the control of AhR activity and cell survival. In our molecular study, miR-125b inhibited AhRR and thereby activated AhR, leading to the induction of mdm2. Consistently, p53 activation by cisplatin was diminished by either miR-125b or oltipraz treatment. The results of experiments using miR-125b mimic or small interfering RNA of AhRR verified the role of miR-125b in AhRR regulation for kidney protection. In conclusion, miR-125b is transcriptionally activated by Nrf2 and serves as an inhibitor of AhRR, which contributes to protecting kidney from acute injury.
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Affiliation(s)
- M S Joo
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Korea
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Lee SE, Lee CG, Kang DH, Lee HY, Jung KH. Preparation of corncob grits as a carrier for immobilizing yeast cells for ethanol production. J Microbiol Biotechnol 2013; 22:1673-80. [PMID: 23221530 DOI: 10.4014/jmb.1202.02049] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
In this study, DEAE-corncobs [delignified corncob grits derivatized with 2-(diethylamino)ethyl chloride hydrochloride (DEAE·HCl)] were prepared as a carrier to immobilize yeast (Saccharomyces cerevisiae) for ethanol production. The immobilized yeast cell reactor produced ethanol under optimized DEAE·HCl derivatization and adsorption conditions between yeast cells and the DEAE-corncobs. When delignified corncob grit (3.0 g) was derivatized with 0.5M DEAE·HCl, the yeast cell suspension (OD600 = 3.0) was adsorbed at >90% of the initial cell OD600. This amount of adsorbed yeast cells was estimated to be 5.36 mg-dry cells/g-DEAE corncobs. The Qmax (the maximum cell adsorption by the carrier) of the DEAE-corncobs was estimated to be 25.1 (mg/g), based on a Languir model biosorption isotherm experiment. When we conducted a batch culture with medium recycling using the immobilized yeast cells, the yeast cells on DEAE-corncobs produced ethanol gradually, according to glucose consumption, without cells detaching from the DEAE-corncobs. We observed under electron microscopy that the yeast cells grew on the surface and in the holes of the DEAEcorncobs. In a future study, DEAE-corncobs and the immobilized yeast cell reactor system will contribute to bioethanol production from biomass hydrolysates.
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Affiliation(s)
- Sang-Eun Lee
- Department of Biotechnology, Chungju National University, Jeungpyung, Chungbuk, Korea
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Lee DS, Kim YS, Lee CG, Lim JH, Suh CO, Kim HJ, Cho J. Early volumetric change and treatment outcome of metastatic brain tumors after external beam radiotherapy: differential radiotherapy for brain metastasis. Clin Transl Oncol 2013; 15:889-96. [PMID: 23408041 DOI: 10.1007/s12094-013-1016-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Accepted: 01/29/2013] [Indexed: 01/17/2023]
Abstract
PURPOSE To evaluate the treatment outcomes of low-dose whole brain radiation therapy (WBRT)-based differential radiation therapy (RT) for metastatic brain tumors. METHODS A total of 242 targets (metastatic brain lesions) were analyzed in the present study. Median WBRT dose and number of fractions were 25 (range 25-35) Gy and 10 (range 8-15) fractions, respectively. A median normalized total dose (NTD) of 1.8 Gy (NTD(1.8Gy)) to the metastatic lesion was 45 (range 27-64.8) Gy. We numbered and contoured each metastatic lesion sequentially using computed tomography fused with serial magnetic resonance imaging to evaluate volumetric changes. RESULTS The 6-month and 1-year freedom from remote intracranial failure rates were 87.7 and 58.5 %, respectively. The 6-month actuarial local control (LC) rate was 93.4 %. Tumor diameter was a major determinant for LC, and tumor histology was a significant parameter predicting the volume reduction rate. With overall complete response (CR) rate of 56.6 % after RT, CR rate, if the target was more than 1 cm in size, was 25 % with a median NTD(1.8Gy) of 45 Gy, requiring dose escalation to achieve better target regression. CONCLUSIONS Low-dose WBRT with selective boost was feasible and effective. Our results pose the rationale of future trial of differential radiation therapy (RT), which prescribes different radiation dose according to the tumor density in metastatic brain tumors.
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Affiliation(s)
- D S Lee
- Department of Radiation Oncology, Yonsei Cancer Center, Severance Hospital, Yonsei University Health System, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, South Korea
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Lee CG, Park GY, Han YK, Lee JH, Chun SH, Park HY, Lim KH, Kim EG, Choi YJ, Yang K, Lee CW. Roles of 14-3-3η in mitotic progression and its potential use as a therapeutic target for cancers. Oncogene 2012; 32:1560-9. [DOI: 10.1038/onc.2012.170] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Seo YC, Choi WY, Kim JS, Lee CG, Ahn JH, Cho HY, Lee SH, Cho JS, Joo SJ, Lee HY. Enhancement of the Cognitive Effects of γ-Aminobutyric Acid from Monosodium Glutamate Fermentation byLactobacillus sakeiB2-16. FOOD BIOTECHNOL 2012. [DOI: 10.1080/08905436.2011.645937] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Seo YC, Choi WY, Lee CG, Cha SW, Kim YO, Kim JC, Drummen GPC, Lee HY. Enhanced immunomodulatory activity of gelatin-encapsulated Rubus coreanus Miquel nanoparticles. Int J Mol Sci 2011; 12:9031-56. [PMID: 22272118 PMCID: PMC3257115 DOI: 10.3390/ijms12129031] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Accepted: 11/29/2011] [Indexed: 12/31/2022] Open
Abstract
The aim of this work was to investigate the immunomodulatory activities of Rubus coreanus Miquel extract-loaded gelatin nanoparticles. The mean size of the produced nanoparticles was 143 ± 18 nm with a bandwidth of 76 nm in the size distribution and a maximum size of ~200 nm, which allows effective nanoparticle uptake by cells. Confocal imaging confirmed this, since the nanoparticles were internalized within 30 min and heterogeneously distributed throughout the cell. Zeta-potential measurements showed that from pH = 5 onwards, the nanoparticles were highly negatively charged, which prevents agglomeration to clusters by electrostatic repulsion. This was confirmed by TEM imaging, which showed a well dispersed colloidal solution. The encapsulation efficiency was nearly 60%, which is higher than for other components encapsulated in gelatin nanoparticles. Measurements of immune modulation in immune cells showed a significant effect by the crude extract, which was only topped by the nanoparticles containing the extract. Proliferation of B-, T- and NK cells was notably enhanced by Rubus coreanus-gelatin nanoparticles and in general ~2–3 times higher than control and on average ~2 times higher than ferulic acid. R. coreanus-gelatin nanoparticles induced cytokine secretion (IL-6 and TNF-α) from B- and T-cells on average at a ~2–3 times higher rate compared with the extract and ferulic acid. In vivo immunomodulatory activity in mice fed with R. coreanus-gelatin nanoparticles at 1 mL/g body weight showed a ~5 times higher antibody production compared to control, a ~1.3 times higher production compared to the extract only, and a ~1.6 times higher production compared to ferulic acid. Overall, our results suggest that gelatin nanoparticles represent an excellent transport vehicle for Rubus coreanus extract and extracts from other plants generally used in traditional Asian medicine. Such nanoparticles ensure a high local concentration that results in enhancement of immune cell activities, including proliferation, cytokine secretion, and antibody production.
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Affiliation(s)
- Yong Chang Seo
- Department of Biomaterials Engineering, Kangwon National University, Chuncheon 200-701, Korea; E-Mails: (Y.C.S.); (W.Y.C.); (C.G.L); (J.-C.K.)
- Medical & Bio-material Research Center, Kangwon National University, Chuncheon 200-701, Korea
| | - Woon Yong Choi
- Department of Biomaterials Engineering, Kangwon National University, Chuncheon 200-701, Korea; E-Mails: (Y.C.S.); (W.Y.C.); (C.G.L); (J.-C.K.)
| | - Choon Geun Lee
- Department of Biomaterials Engineering, Kangwon National University, Chuncheon 200-701, Korea; E-Mails: (Y.C.S.); (W.Y.C.); (C.G.L); (J.-C.K.)
| | - Seon Woo Cha
- Department of Herbal Crop Research, National Institute of Horticultural & Herbal Science, RDA, Eumseong 369-873, Korea; E-Mails: (S.W.C.); (Y.O.K.)
| | - Young Ock Kim
- Department of Herbal Crop Research, National Institute of Horticultural & Herbal Science, RDA, Eumseong 369-873, Korea; E-Mails: (S.W.C.); (Y.O.K.)
| | - Jin-Chul Kim
- Department of Biomaterials Engineering, Kangwon National University, Chuncheon 200-701, Korea; E-Mails: (Y.C.S.); (W.Y.C.); (C.G.L); (J.-C.K.)
| | - Gregor P. C. Drummen
- Bionanoscience and Bio-Imaging Program, Cellular Stress and Ageing Program, Bio&Nano-Solutions, D-40472 Düsseldorf, Germany
- Authors to whom correspondence should be addressed; E-Mails: (G.P.C.D.); (H.Y.L.); Tel.: +49-211-2297-3648 (G.P.C.D.); +82-33-250-6455 (H.Y.L.); Fax: +49-3222-240-7500 (G.P.C.D.); +82-33-253-6560 (H.Y.L.)
| | - Hyeon Yong Lee
- Department of Biomaterials Engineering, Kangwon National University, Chuncheon 200-701, Korea; E-Mails: (Y.C.S.); (W.Y.C.); (C.G.L); (J.-C.K.)
- Medical & Bio-material Research Center, Kangwon National University, Chuncheon 200-701, Korea
- Authors to whom correspondence should be addressed; E-Mails: (G.P.C.D.); (H.Y.L.); Tel.: +49-211-2297-3648 (G.P.C.D.); +82-33-250-6455 (H.Y.L.); Fax: +49-3222-240-7500 (G.P.C.D.); +82-33-253-6560 (H.Y.L.)
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Lin X, Lee CG, Casale ES, Shih JC. Purification and Characterization of a Keratinase from a Feather-Degrading Bacillus licheniformis Strain. Appl Environ Microbiol 2010; 58:3271-5. [PMID: 16348784 PMCID: PMC183090 DOI: 10.1128/aem.58.10.3271-3275.1992] [Citation(s) in RCA: 187] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A keratinase was isolated from the culture medium of feather-degrading Bacillus licheniformis PWD-1 by use of an assay of the hydrolysis of azokeratin. Membrane ultrafiltration and carboxymethyl cellulose ion-exchange and Sephadex G-75 gel chromatographies were used to purify the enzyme. The specific activity of the purified keratinase relative to that in the original medium was approximately 70-fold. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis and Sephadex G-75 chromatography indicated that the purified keratinase is monomeric and has a molecular mass of 33 kDa. The optimum pH and the pI were determined to be 7.5 and 7.25, respectively. Under standard assay conditions, the apparent temperature optimum was 50 degrees C. The enzyme is stable when stored at -20 degrees C. The purified keratinase hydrolyzes a broad range of substrates and displays higher proteolytic activity than most proteases. In practical applications, keratinase is a useful enzyme for promoting the hydrolysis of feather keratin and improving the digestibility of feather meal.
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Affiliation(s)
- X Lin
- Department of Poultry Science and University Biotechnology Program, North Carolina State University, Raleigh, North Carolina 27695-7608
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Park KS, Jeong HS, Baek KA, Lee CG, Park SM, Park JS, Choi YJ, Choi HJ, Cheon DS. Genetic analysis of norovirus GII.4 variants circulating in Korea in 2008. Arch Virol 2010; 155:635-41. [PMID: 20224892 DOI: 10.1007/s00705-010-0627-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Accepted: 02/05/2010] [Indexed: 11/29/2022]
Abstract
Noroviruses are the enteric pathogens most commonly responsible for infectious gastroenteritis and outbreaks of foodborne illness. The GII.4 norovirus, in particular, is responsible for the majority of epidemics. Here, we present data on the distribution of norovirus genotypes in Chungnam, Korea, in 2008, measure genetic variation among GII.4 strains, and compare Korean GII.4 variants with reference strains based on the 237-bp junction of ORF1 and ORF2. We detected 139 different strains, which formed two distinct genetic clusters with significant sequence diversity. One Korean cluster (2008-Korea_a) showed high similarity to the Sakai cluster that appeared in Japan and Europe in 2006. The other cluster (2008-Korea_b) was unique and unrelated to previously reported clusters. Genotype GII.4 was confirmed as the predominant cause of norovirus epidemics in Korea. Foodborne norovirus infections, on the other hand, were generally caused by emerging GII.4 genetic variants similar to those responsible for global epidemics.
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Affiliation(s)
- K S Park
- Chungcheongnam-Do Institute of Health and Environmental Research, Daejeon, Korea
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Sharma SK, Vargas JM, De Biasi E, Béron F, Knobel M, Pirota KR, Meneses CT, Kumar S, Lee CG, Pagliuso PG, Rettori C. The nature and enhancement of magnetic surface contribution in model NiO nanoparticles. Nanotechnology 2010; 21:035602. [PMID: 19966407 DOI: 10.1088/0957-4484/21/3/035602] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We report an alternative synthesis method and novel magnetic properties of Ni-oxide nanoparticles (NPs). The NPs were prepared by thermal decomposition of nickel phosphine complexes in a high-boiling-point organic solvent. These particles exhibit an interesting morphology constituted by a crystalline core and a broad disordered superficial shell. Our results suggest that the magnetic behavior is mainly dominated by strong surface effects at low temperature, which become evident through the observation of shifted hysteresis loops (approximately 2.2 kOe), coercivity enhancement (approximately 10.2 kOe) and high field irreversibility (>or=50 kOe). Both an exchange bias and a vertical shift in magnetization can be observed in this system below 35 K after field cooling. Additionally, the exchange bias field shows a linear dependence on the magnetization shift values, which elucidate the role of pinned spins on the exchange fields. The experimental data are analyzed in terms of the interplay between the interface exchange coupling and the antiferromagnetically ordered structure of the core.
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Affiliation(s)
- S K Sharma
- Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas (UNICAMP) Campinas, SP, Brazil.
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Lai WL, Chen JJ, Chung CY, Lee CG, Liao SW. The influence of lagoon on neighboring rivers by water and sediment quality. Water Sci Technol 2010; 61:2477-2489. [PMID: 20453320 DOI: 10.2166/wst.2010.840] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Canonical discriminant analysis (CDA) was applied in order to distinguish the water-quality and the sediment-quality parameters from neighboring rivers, and to recognize similarities of water and sediment properties between a lagoon and neighboring rivers. Two set of constructed discriminant functions showed a marked contribution to most of the discriminant variables. In water, the significant parameters - the total nitrogen, algae, dissolved oxygen and total phosphate - were combined as the nutrient effect factor. The recognition capacities of the two discriminant functions were 95.6 and 4.4%, respectively; the Kaoping River showed the most similarities with the water quality in Dapeng Bay; in sediment, the significant parameters porosity, Cd, Cr, Al, and Pb were combined as the heavy metal effect factor. The recognition capacities were 82.6 and 17.4%, respectively, but the sediment properties in these three rivers had no significant similarity with the Dapeng Bay.
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Affiliation(s)
- W L Lai
- Department of Environmental Resources Management, Tajen University, Pingtung, Taiwan, China
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Sharma SK, Kumar R, Kumar S, Knobel M, Meneses CT, Siva Kumar VV, Reddy VR, Singh M, Lee CG. Role of interparticle interactions on the magnetic behavior of Mg(0.95)Mn(0.05)Fe(2)O(4) ferrite nanoparticles. J Phys Condens Matter 2008; 20:235214. [PMID: 21694305 DOI: 10.1088/0953-8984/20/23/235214] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We present here a detailed investigation of the static and dynamic magnetic behavior of a Mg(0.95)Mn(0.05)Fe(2)O(4) spinel ferrite nanoparticle system synthesized by high-energy ball milling of almost identical particle size distributions ([Formula: see text], 5.1 and 6.0 ± 0.6 nm). The samples were characterized by using x-ray diffraction, Mössbauer spectroscopy, dc magnetization and frequency dependent real χ(')(T) and imaginary χ('')(T) parts of ac susceptibility measurements. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization have been recorded in a low field and show a behavior typical of superparamagnetic particles above a temperature of 185 ± 5 K, which is further supported from the temperature dependent Mössbauer measurements. The fact that the blocking temperature calculated from the ZFC magnetization and Mössbauer data are almost similar gives a clear indication of the interparticle interactions among these nanoparticle systems. This is further supported from the FC magnetization curves, which are almost flat below a certain temperature (less than the blocking temperature), as compared with the monotonically increasing behavior characteristics of non-interacting superparamagnetic particles. A shift of the blocking temperature with increasing frequency was observed in the real χ(')(T) and imaginary χ('')(T) parts of the ac susceptibility measurements. The analysis of the results shows that the data fit well with the Vogel-Fulcher law, whereas trials using the Neel-Brown and power law are unproductive. The role of magnetic interparticle interactions on the magnetic behavior, namely superparamagnetic relaxation time and magnetic anisotropy, are discussed.
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Affiliation(s)
- S K Sharma
- Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas (UNICAMP) Campinas, 13.083-970, SP, Brazil
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Kwon S, Kang DM, Kim SY, Sa KJ, Lee CG, Lim JH, Jee YK, Ha MN, Hong SJ, Hong YC, Kwon HJ, Oh SY. Dietary factors in relation to atopic dermatitis among urban school‐aged children in Korea. FASEB J 2008. [DOI: 10.1096/fasebj.22.1_supplement.876.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sung‐Ok Kwon
- Food and NutritionKyunghee Univ.SeoulRepublic of Korea
| | - DM Kang
- Pusan Nat'l Univ.PusanRepublic of Korea
| | - SY Kim
- Cheju Nat'l Univ.ChejuRepublic of Korea
| | - KJ Sa
- Yeungnam Univ.GyeongsanRepublic of Korea
| | - CG Lee
- Chosun Univ.GwangjuRepublic of Korea
| | - JH Lim
- Inha Univ.IncheonRepublic of Korea
| | - YK Jee
- Dankook Univ.CheonanRepublic of Korea
| | - MN Ha
- Dankook Univ.CheonanRepublic of Korea
| | - SJ Hong
- Ulsan Univ.SeoulRepublic of Korea
| | - YC Hong
- Seoul Nat'l Univ.SeoulRepublic of Korea
| | - HJ Kwon
- Dankook Univ.CheonanRepublic of Korea
| | - SY Oh
- Food and NutritionKyunghee Univ.SeoulRepublic of Korea
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Shin JW, Lee JS, Sul AR, Lee CG, Yoon YR, Takeuch H, Minamitani H. Chronic stress evaluation using neuro-fuzzy. Conf Proc IEEE Eng Med Biol Soc 2007; 2006:373-4. [PMID: 17271688 DOI: 10.1109/iembs.2004.1403170] [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: 11/06/2022]
Abstract
The purpose of this research was to evaluate chronic stress using physiological parameters. Wistar rats were exposed to sound stress for 14 days. Biosignals were acquired hourly. To develop a fuzzy inference system that can integrate physiological parameters, the parameters of the system were adjusted by the adaptive neuro-fuzzy inference system. Of the training dataset, the input dataset was the physiological parameters from the biosignals and the output dataset was the target values from the cortisol production. Physiological parameters were integrated using the fuzzy inference system, then 24-hour results were analyzed by the Cosinor method. Chronic stress was evaluated from the degree of circadian rhythm disturbance. Suppose that the degree of stress for initial rest period was 1. Then, the degree of stress after 14-day sound stress increased to 131, and increased to 1.47 after the 7-day recovery period. That is, the rat was exposed to 37%increased amount of stress by the 14-day sound and did not recover after the 7-day recovery period.
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Affiliation(s)
- J W Shin
- Home Health Management Center, Yonsei Univ., Korea
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Liao SW, Sheu JY, Chen JJ, Lee CG. Water quality assessment and apportionment source of pollution from neighbouring rivers in the Tapeng Lagoon (Taiwan) using multivariate analysis: a case study. Water Sci Technol 2006; 54:47-55. [PMID: 17302304 DOI: 10.2166/wst.2006.835] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Factor analysis was conducted to explain the characteristics and variation in the quality of water during the disassembly of oyster frames and fishery boxes. The result shows that the most important latent factors in the Tapeng Lagoon are the ocean factor, the primary productivity factor, and the fishery pollution factor. Canonical discriminant analysis is applied to identify the source of pollution in neighbouring rivers outside the Tapeng Lagoon. The two constructed discriminant functions (CDFs) showed a marked contribution to all the discriminant variables, and that total nitrogen, algae, dissolved oxygen, and total phosphate combined in the nutrient effect factor. The recognition capacities in these two CDFs were 95.6% and 4.4%, respectively. The water quality in the Kaoping river most strongly affected the water quality in the Tapeng Lagoon. Disassembling the oyster frames and fishery boxes improved the water quality markedly. However, environmental topographic conditions indicate that strengthening stream pollution prevention and constructing another entrance to the ocean are the best approaches for improving the quality of water in the Tapeng Lagoon by reducing eutrophication. These approaches and results yield useful information concerning habitat recovery and water resource management.
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Affiliation(s)
- S W Liao
- Department of Environmental Engineering and Science, Tajen University, Pingtung, 10907, Chinese Taiwan.
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31
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Affiliation(s)
- Y K Kwon
- Avian Disease Division, National Veterinary Research and Quarantine Service, 480, Anyang City, Gyeonggi-do, 430-824, Republic of Korea
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Lee CG, Farrell AP, Lotto A, Hinch SG, Healey MC. Excess post-exercise oxygen consumption in adult sockeye (Oncorhynchus nerka) and coho (O. kisutch) salmon following critical speed swimming. J Exp Biol 2003; 206:3253-60. [PMID: 12909706 DOI: 10.1242/jeb.00548] [Citation(s) in RCA: 130] [Impact Index Per Article: 6.2] [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: 10/27/2022]
Abstract
The present study measured the excess post-exercise oxygen cost (EPOC) following tests at critical swimming speed (Ucrit) in three stocks of adult, wild, Pacific salmon (Oncorhynchus sp.) and used EPOC to estimate the time required to return to their routine level of oxygen consumption (recovery time) and the total oxygen cost of swimming to Ucrit. Following exhaustion at Ucrit, recovery time was 42-78 min, depending upon the fish stock. The recovery times are several-fold shorter than previously reported for juvenile, hatchery-raised salmonids. EPOC varied fivefold among the fish stocks, being greatest for Gates Creek sockeye salmon (O. nerka), which was the salmon stock that had the longest in-river migration, experienced the warmest temperature and achieved the highest maximum oxygen consumption compared with the other salmon stocks that were studied. EPOC was related to Ucrit, which in turn was directly influenced by ambient test temperature. The non-aerobic cost of swimming to Ucrit was estimated to add an additional 21.4-50.5% to the oxygen consumption measured at Ucrit. While these non-aerobic contributions to swimming did not affect the minimum cost of transport, they were up to three times higher than the value used previously for an energetic model of salmon migration in the Fraser River, BC, Canada. As such, the underestimate of non-aerobic swimming costs may require a reevaluation of the importance of how in-river barriers like rapids and bypass facilities at dams, and year-to-year changes in river flows and temperatures, affect energy use and hence migration success.
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Affiliation(s)
- C G Lee
- Biological Sciences, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada
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Lee CG, Farrell AP, Lotto A, MacNutt MJ, Hinch SG, Healey MC. The effect of temperature on swimming performance and oxygen consumption in adult sockeye (Oncorhynchus nerka) and coho (O. kisutch) salmon stocks. J Exp Biol 2003; 206:3239-51. [PMID: 12909705 DOI: 10.1242/jeb.00547] [Citation(s) in RCA: 351] [Impact Index Per Article: 16.7] [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]
Abstract
Our knowledge of the swimming capabilities and metabolic rates of adult salmon, and particularly the influence of temperature on them, is extremely limited, and yet this information is critical to understanding the remarkable upstream migrations that these fish can make. To remedy this situation, we examined the effects of temperature on swimming performance and metabolic rates of 107 adult fish taken from three stocks of sockeye salmon Oncorhynchus nerka and one stock of coho salmon O. kisutch at various field and laboratory locations, using large, portable, swim tunnels. The salmon stocks were selected because of differences in their ambient water temperature (ranging from 5 degrees C to 20 degrees C) and the total distance of their in-river migrations (ranging from approximately 100 km for coastal stocks to approximately 1100 km for interior stocks). As anticipated, differences in routine metabolic rate observed among salmon stocks were largely explained by an exponential dependence on ambient water temperature. However, the relationship between water temperature and maximum oxygen consumption (MO2max), i.e. the MO2 measured at the critical swimming speed (Ucrit), revealed temperature optima for MO2max that were stock-specific. These temperature optima were very similar to the average ambient water temperatures for the natal stream of a given stock. Furthermore, at a comparable water temperature, the salmon stocks that experienced a long and energetically costly in-river migration were characterized by a higher MO2max, a higher scope for activity, a higher Ucrit and, in some cases, a higher cost of transport, relative to the coastal salmon stocks that experience a short in-river migration. We conclude that high-caliber respirometry can be performed in a field setting and that stock-specific differences in swimming performance of adult salmon may be important for understanding upstream migration energetics and abilities.
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Affiliation(s)
- C G Lee
- Biological Sciences, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada
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Kim GE, Lim J, Park HC, Keum KC, Kim YB, Moon SR, Lee CG, Seong J, Suh CO. A feasibility study using three-dimensional conformal boost technique in locally advanced carcinoma of the nasopharynx. Acta Oncol 2002; 40:582-7. [PMID: 11669329 DOI: 10.1080/028418601750444114] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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: 10/17/2022]
Abstract
To investigate the feasibility and efficacy of dose escalation using three-dimensional (3-D) conformal boost technique, 21 patients with stage III or IV nasopharyngeal cancer were enrolled in a prospective protocol. All patients with node metastases initially received external radiotherapy by conventional technique up to 70.2 Gy, followed by 3-D conformal radiotherapy (3-D CRT) to the boost part up to 79.2 Gy with 9 Gy increments (daily fraction of 1.8 Gy for 5 days). A modified technique with the same dose escalation of 9 Gy using 3-D CRT was applied to 7 patients without node metastases, who were treated by conventional technique up to 54 Gy, followed by 3-D CRT to boost up to a basic dose of 70.2 Gy, and then finally with dose escalation of 9 Gy. The protocol was relatively well tolerated by the majority of patients. Acute complications during the dose escalation schedule was low, with rare occurrences of grade 3 or 4 toxicity. Although late radiation-induced complications also appeared limited, 1 patient developed a temporal lobe necrosis and 2 patients suffered from sensory-neural hearing loss. There were no radiation-induced fatal complications. At a median follow-up of 48 months, only 3 patients experienced local failure and 2 patients developed distant metastases. The 5-year overall actuarial survival rate and recurrence-free survival rate for all patients were 68% and 85%, respectively. On the basis of acceptable morbidity and encouraging treatment results, we conclude that the dose escalation in 9 Gy increments using a 3-D conformal boost technique is relatively safe and efficacious, enough to be used routinely for locally advanced nasopharyngeal cancers.
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Affiliation(s)
- G E Kim
- Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University, College of Medicine, Seoul, Korea.
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Abstract
OBJECTIVES Dyspnea and palpitation are common features of pregnancy. While several theories have been put forward to explain the etiology of gestational dyspnea and palpitation, there have been few systemic studies of its incidence, severity and time-course in a group of normal women. METHODS We interviewed postpartum women, within 3 days after delivery, about dyspnea and palpitation. Separately from this interview, we performed 24-hour ECG monitoring for obstetric patients with palpitation before delivery. RESULTS The subjects interviewed were 261 women, of whom 37.5 percent and 11.5 percent experienced dyspnea and palpitation, respectively. These symptoms had tendency to increase to term. The presence of arrhythmias could be documented in only 22% of patients having 24-hour Holter monitoring. CONCLUSION Dyspnea and palpitation were common among normal pregnant women and had a tendency to increase to term.
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Affiliation(s)
- H S Choi
- Department of Medicine, Samsung Cheil Hospital and Women's Health Care Center, Sungkyunkwan University, 1-19 Mookjung-Dong, Chung-Ku, Seoul 100-380, Korea
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Chiang KY, Hazlett LJ, Godder KT, Abhyankar SH, Christiansen NP, van Rhee F, Lee CG, Bridges K, Parrish RS, Henslee-Downey PJ. Epstein-Barr virus-associated B cell lymphoproliferative disorder following mismatched related T cell-depleted bone marrow transplantation. Bone Marrow Transplant 2001; 28:1117-23. [PMID: 11803352 DOI: 10.1038/sj.bmt.1703311] [Citation(s) in RCA: 12] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2000] [Accepted: 10/04/2001] [Indexed: 11/08/2022]
Abstract
Epstein-Barr virus (EBV) is closely associated with the progressive and often fatal lymphoproliferative disorders (LPD) in post bone marrow transplantation (BMT) and immunocompromised hosts. The incidence increases significantly when alternative donors or manipulation of marrow graft are used. A total of 318 consecutive BMT from partially mismatched related family donors (PMRD) were performed between February 1993 and June 1998. Known risk factors for the development of EBV-LPD were analyzed which included HLA mismatches, T cell depletion, antithymocyte globulin (ATG), and graft-versus-host disease (GVHD). Eighteen patients (5.7%) developed EBV-LPD at a median of 137 days post BMT (range 48-617). The estimated probability of developing EBV-LPD was 0.13 (95% CI 0.07-0.19) at 5 years. The incidence of grade II to IV GVHD was 19.2%, which translated into an increased trend of EBV-LPD. No correlation with other risk factors was observed. Treatment consisted of supportive antiviral agents, tapering of immunosuppressive regimens, donor leukocyte infusions and radiation. Three patients are alive and disease-free at a median follow-up of 69 months (range 36-71). We observed a lower than expected incidence of EBV-LPD despite existing multiple high-risk factors. We believe prevention and early control of GVHD may contribute to this finding.
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Affiliation(s)
- K Y Chiang
- Children's Healthcare of Atlanta, 2040 Ridgewood Drive NE, Suite 100, Atlanta, GA 30322, USA
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Zhu Z, Lee CG, Zheng T, Chupp G, Wang J, Homer RJ, Noble PW, Hamid Q, Elias JA. Airway inflammation and remodeling in asthma. Lessons from interleukin 11 and interleukin 13 transgenic mice. Am J Respir Crit Care Med 2001; 164:S67-70. [PMID: 11734470 DOI: 10.1164/ajrccm.164.supplement_2.2106070] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.2] [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: 11/16/2022] Open
Abstract
Noninflammatory structural alterations, variously referred to as airway remodeling, are well documented in the asthmatic airway. However, the pathogenesis of these alterations, the importance of airway remodeling in generating the asthma phenotype, and the natural history of airway remodeling responses have not been adequately defined. Because exaggerated cytokine production is a characteristic feature of the asthmatic airway, we used constitutive and inducible overexpression transgenic systems to investigate the contributions that interleukin 11 (IL-11) and IL-13 might make to airway remodeling responses. These studies demonstrated that both cytokines produce responses in the murine airway with features similar to those in human asthmatic tissues. IL-11 caused airway fibrosis with the enhanced accumulation of interstitial collagens, myocytes, and myofibroblasts. IL-13 caused mucous metaplasia, enhanced mucin gene expression, enhanced tissue hyaluronic acid accumulation, and subepithelial fibrosis. Importantly, IL-11 was detected most readily in tissues from asthmatic subjects with severe airway remodeling that was similar to that seen in the IL-11 transgenic mice. In addition, IL-11 was shown to inhibit asthma-like inflammation while stimulating airway fibrosis. This suggests that IL-11 elaboration is, in part, an attempt at airway healing. Last, a novel triple transgenic system is described that allows transgene expression to be regulated in a true "on/off" manner. This system may be useful in defining the reversibility of transgene-induced airway remodeling responses.
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Affiliation(s)
- Z Zhu
- Section of Pulmonary and Critical Care Medicine, and Department of Pathology, Yale University School of Medicine, New Haven, Connecticut 06520-8057, USA
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Buschmann T, Lerner D, Lee CG, Ronai Z. The Mdm-2 amino terminus is required for Mdm2 binding and SUMO-1 conjugation by the E2 SUMO-1 conjugating enzyme Ubc9. J Biol Chem 2001; 276:40389-95. [PMID: 11384992 DOI: 10.1074/jbc.m103786200] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [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: 11/06/2022] Open
Abstract
Covalent attachment of SUMO-1 to Mdm2 requires the activation of a heterodimeric Aos1-Uba2 enzyme (ubiquitin-activating enzyme (E1)) followed by the conjugation of Sumo-1 to Mdm2 by Ubc9, a protein with a strong sequence similarity to ubiquitin carrier proteins (E2s). Upon Sumo-1 conjugation, Mdm2 is protected from self-ubiquitination and elicits greater ubiquitin-protein isopeptide ligase (E3) activity toward p53, thereby increasing its oncogenic potential. Because of the biological implication of Mdm2 sumoylation, we mapped Ubc9 binding on Mdm2. Here we demonstrate that Ubc9 can associate with Mdm2 only if amino acids 40-59 within the N terminus of Mdm2 are present. Mdm2 from which amino acids 40-59 have been deleted can no longer be sumoylated. Furthermore, addition of a peptide that corresponds to amino acids 40-59 on Mdm2 to a sumoylation reaction efficiently inhibits Mdm2 sumoylation in vitro and in vivo. In UV-treated cells Mdm2 exhibits reduced association with Ubc9, which coincides with decreased Mdm2 sumoylation. Our findings regarding the association of Ubc9 with Mdm2, and the effect of UV-irradiation on Ubc9 binding, point to an additional level in the regulation of Mdm2 sumoylation under normal growth conditions as well as in response to stress conditions.
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Affiliation(s)
- T Buschmann
- Ruttenberg Cancer Center, Mount Sinai School of Medicine, New York, New York 10029, USA
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Abstract
PURPOSE To investigate the clinical behavior and treatment outcome of patients with primary squamous cell carcinoma (SCC) of the parotid gland. PATIENTS AND METHODS Twelve cases of primary SCC originating in the parotid gland were retrospectively reviewed. The majority of patients had a locally advanced disease. Eight cases underwent a combination of radical surgery and postoperative radiotherapy, whereas the remaining four cases were treated with radiotherapy alone. Patterns of treatment failure, survival rate, and prognostic factors for these patients were investigated. RESULTS The predominant pattern of failure was local failure, either alone or in combination with other failures. Two patients who were treated with radiation alone had persistent disease after completion of treatment, whereas 4 of 8 patients who received combined modality treatment and 2 of 4 patients who were treated with radiation alone subsequently developed local recurrences in the primary site or surgical bed. The local failure rate and regional failure rate were 58% and 25%, respectively. Most locoregional recurrences developed within 1 year after initial treatment. Only 2 patients had distant metastasis. The prognosis appeared to be relatively poor for those patients, compared with those with SCC in other head and neck sites. The overall 5-year actuarial survival rate and the disease-free survival rate were 31% and 33%, respectively. Although advanced stage, facial nerve palsy, and regional lymph node metastasis all portended an unfavorable prognosis, only patient age and treatment modality were found to be statistically significant poor prognostic factors. CONCLUSIONS Primary SCC of the parotid gland is an uncommon tumor with a highly malignant potential. Our results indicate that a combination of radical surgery and postoperative radiotherapy is the treatment of choice for achieving better locoregional control rates and improved cure rates in the treatment of these patients.
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Affiliation(s)
- S Lee
- Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University, College of Medicine, Seoul, Korea
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Deng L, Wang D, de la Fuente C, Wang L, Li H, Lee CG, Donnelly R, Wade JD, Lambert P, Kashanchi F. Enhancement of the p300 HAT activity by HIV-1 Tat on chromatin DNA. Virology 2001; 289:312-26. [PMID: 11689053 DOI: 10.1006/viro.2001.1129] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [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: 11/22/2022]
Abstract
HIV-1 Tat is able to form a ternary complex with P/CAF and p300 and increase the affinity for CDK9/P-TEFb CTD kinase complex. Our previous study demonstrated that Tat binds to p300/CBP in the minimal HAT domain (aa 1253-1790) and that the interaction results in a change of conformation on p300/CBP. Here, we show that the Tat-p300 interaction increases the HAT activity of p300 on histone H4 that is associated with nucleosomal DNA and not with free histones. Nucleosomal histone H4 was acetylated on lysines 8, 12, and 16. Acetylation of H4 was inhibited by Lys-coenzyme A (CoA), a selective inhibitor of p300 acetyltransferase activity. Unexpectedly, we also found that Tat could autoacetylate itself, which was specific to lysine residues 41 and 71. Peptides lacking these two lysines could not enhance the HAT activity of p300. Comparison of the sequences of Tat with other HIV-1 clades and HAT containing transcription factors indicated sequence identity in the acetyl-CoA binding motif A, KGXG. Furthermore, when utilizing an in vitro transcription assay, as well as a Tat mutant virus, we found that ectopic expression of only wild-type Tat in the presence of p300, and not a lysine 41 Tat mutant, could activate HIV-1 chromatin DNA, as evidenced by the absence of HIV-1 virion antigen. Therefore, transcription of integrated viral DNA in vivo requires the HAT activity of coactivators that are modulated by Tat to derepress the HIV-1 chromatin structure and aid in activated transcription.
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Affiliation(s)
- L Deng
- Department of Biochemistry and Molecular Biology, UMDNJ-New Jersey Medical School, Newark, New Jersey 07103, USA
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Wee SH, Lee CG, Joo HD, Kang YB. Enzyme-linked immunosorbent assay for detection of Trichinella spiralis antibodies and the surveillance of selected pig breeding farms in the Republic of Korea. Korean J Parasitol 2001; 39:261-4. [PMID: 11590917 PMCID: PMC2721076 DOI: 10.3347/kjp.2001.39.3.261] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Trichinellosis is a parasitic zoonosis of public health importance. It is caused by Trichinella spiralis which has a wide host range including humans. In the present communication, the ELISA technique was employed on a total of 803 blood samples from 7 selected pig breeding farms in 1996 for diagnosis and surveillance of trichinellosis. Out of the entire 803 samples, nine were found to be suspected while one was positive by ELISA. But western blot analyses employed for further confirmation have shown that all of 10 samples did not react to larval excretory-secretory product antigens. These results indicate that pig breeding farms included in the present study are free from trichinellosis. However, it does not mean Korea is free from trichinellosis since human trichinellosis has recently been reported. The necessity of continued surveillance for trichinellosis in both pigs and wild animals was discussed.
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Affiliation(s)
- S H Wee
- National Veterinary Research & Quarantine Service, MAF, Anyang 430-824, Korea.
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42
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Abstract
Evidence suggests lipid abnormalities may contribute to elevated blood pressure, increased vascular resistance, and reduced arterial compliance among insulin-resistant subjects. In a study of 11 normal volunteers undergoing 4-h-long infusions of Intralipid and heparin to raise plasma nonesterified fatty acids (NEFAs), we observed increases of blood pressure. In contrast, blood pressure did not change in these same volunteers during a 4-h infusion of saline and heparin. To better characterize the hemodynamic responses to Intralipid and heparin, another group of 21 individuals, including both lean and obese volunteers, was studied after 3 wk on a controlled diet with 180 mmol sodium/day. Two and four hours after starting the infusions, plasma NEFAs increased by 134 and 111% in those receiving Intralipid and heparin, P < 0.01, whereas plasma NEFAs did not change in the first group of normal volunteers who received saline and heparin. The hemodynamic changes in lean and obese subjects in the second study were similar, and the results were combined. The infusion of Intralipid and heparin induced a significant increase in systolic (13.5 +/- 2.1 mmHg) and diastolic (8.0 +/- 1.5 mmHg) blood pressure as well as heart rate (9.4 +/- 1.4 beats/min). Small and large artery compliance decreased, and systemic vascular resistance rose. These data raise the possibility that lipid abnormalities associated with insulin resistance contribute to the elevated blood pressure and heart rate as well as the reduced vascular compliance observed in subjects with the cardiovascular risk factor cluster.
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Affiliation(s)
- M P Stojiljkovic
- Department of Pharmacology, Medical University of South Carolina, Charleston, South Carolina 29425, USA
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Abstract
Potential applications of the MDR1 multidrug transporter in gene therapy include protecting sensitive bone marrow cells against cytotoxic drugs during cancer chemotherapy and serving as a dominant selectable marker when coexpressed with a corrective passenger gene. To address safety concerns associated with integrating viral systems, such as retroviruses, we tested the feasibility of maintaining a nonvirally delivered MDR1 gene (pEpiHaMA) episomally. An MDR1 vector containing the Epstein-Barr virus (EBV) origin of replication (OriP) and its nuclear retention protein (EBNA-1) was transfected into human (KB-3-1) cells. MDR1 was expressed at a higher level in cells carrying the episomal vector, pEpiHaMA, compared with the vector lacking sequences needed for episomal maintenance (pHaMA). Furthermore, more drug-resistant KB-3-1 colonies were obtained on selection after transfection with pEpiHaMA. These observations correlated with longer maintenance of episomes in cells transfected with pEpiHaMA. In addition, episomes could still be recovered for more than 1 month from tumor explants in nude mice that were injected with pEpiHaMA-liposome complexes after drug selection, suggesting that these constructs can be maintained extrachromosomally in vivo.
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Affiliation(s)
- C G Lee
- Department of Biochemistry, National University of Singapore, Singapore
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44
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Manthey D, Banach K, Desplantez T, Lee CG, Kozak CA, Traub O, Weingart R, Willecke K. Intracellular domains of mouse connexin26 and -30 affect diffusional and electrical properties of gap junction channels. J Membr Biol 2001; 181:137-48. [PMID: 11420600 DOI: 10.1007/s00232-001-0017-1] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2000] [Indexed: 10/25/2022]
Abstract
To evaluate the influence of intracellular domains of connexin (Cx) on channel transfer properties, we analyzed mouse connexin (Cx) Cx26 and Cx30, which show the most similar amino acid sequence identities within the family of gap junction proteins. These connexin genes are tightly linked on mouse chromosome 14. Functional studies were performed on transfected HeLa cells stably expressing both mouse connexins. When we examined homotypic intercellular transfer of microinjected neurobiotin and Lucifer yellow, we found that gap junctions in Cx30-transfected cells, in contrast to Cx26 cells, were impermeable to Lucifer yellow. Furthermore, we observed heterotypic transfer of neurobiotin between Cx30-transfectants and HeLa cells expressing mouse Cx30.3, Cx40, Cx43 or Cx45, but not between Cx26 transfectants and HeLa cells of the latter group. The main differences in amino acid sequence between Cx26 and Cx30 are located in the presumptive cytoplasmic loop and C-terminal region of these integral membrane proteins. By exchanging one or both of these domains, using PCR-based mutagenesis, we constructed Cx26/30 chimeric cDNAs, which were also expressed in HeLa cells after transfection. Homotypic intercellular transfer of injected Lucifer yellow was observed exclusively with those chimeric constructs that coded for both cytoplasmic domains of Cx26 in the Cx30 backbone polypeptide chain. In contrast, cells transfected with a construct that coded for the Cx26 backbone with the Cx30 cytoplasmic loop and C-terminal region did not show transfer of Lucifer yellow. Thus, Lucifer yellow transfer can be conferred onto chimeric Cx30 channels by exchanging the cytoplasmic loop and the C-terminal region of these connexins. In turn, the cytoplasmic loop and C-terminal domain of Cx30 prevent Lucifer yellow transfer when swapped with the corresponding domains of Cx26. In chimeric Cx30/Cx26 channels where the cytoplasmic loop and C-terminal domains had been exchanged, the unitary channel conductance was intermediate between those of the parental channels. Moreover, the voltage sensitivity was slightly reduced. This suggests that these cytoplasmic domains interfere directly or indirectly with the diffusivity, the conductance and voltage gating of the channels.
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Affiliation(s)
- D Manthey
- Institut für Genetik, Abt. Molekulargenetik, Universität Bonn, Römerstr. 164, 53117 Bonn, Germany
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Kinoshita K, Lee CG, Tashiro J, Muramatsu M, Chen XC, Yoshikawa K, Honjo T. Molecular mechanism of immunoglobulin class switch recombination. Cold Spring Harb Symp Quant Biol 2001; 64:217-26. [PMID: 11232289 DOI: 10.1101/sqb.1999.64.217] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- K Kinoshita
- Department of Medical Chemistry, Kyoto University Faculty of Medicine, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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Cho JH, Kim GE, Cho KH, Lee CG, Kim YB, Lee SW, Keum KC, Suh CO. Hyperfractionated re-irradiation using a 3-dimensional conformal technique for locally recurrent carcinoma of the nasopharynx; preliminary results. Yonsei Med J 2001; 42:55-64. [PMID: 11293502 DOI: 10.3349/ymj.2001.42.1.55] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
To evaluate the efficacy of hyperfractionated re-irradiation using a three-dimensional conformal radiotherapy (3-D CRT) technique in patients with locally recurrent carcinoma of the nasopharynx. Four patients with locally recurrent nasopharyngeal cancer were retreated with a hyperfractionated schedule using a 3-D CRT technique. Re-irradiation was delivered in 1.1-1.2 Gy fractions twice per day (BID), with interfraction intervals of more than 6 hours. The total dose ranged from 59.4 to 69.2 Gy. A 3-D CRT technique with 5- or 6-field coplanar and/or non-coplanar beams were employed during the entire treatment procedure. All four patients achieved complete remission of locally recurrent lesions, with marked improvement of subjective symptoms, immediately after re-irradiation. All are alive and well without evidence of disease after limited follow-up periods, which range from 7 to 20 months. So far, there have been no radiation-induced neurologic complications. Four patients with locally recurrent carcinoma of the nasopharynx were successfully treated by hyperfractionated re-irradiation using a 3-D CRT technique. A relatively high re-irradiation dose of more than 60 Gy may be safely delivered with no serious acute or late radiation-induced complications in patients with local recurrences and who were initially treated with doses greater than 70 Gy.
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Affiliation(s)
- J H Cho
- Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, Korea
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Deng L, de la Fuente C, Fu P, Wang L, Donnelly R, Wade JD, Lambert P, Li H, Lee CG, Kashanchi F. Acetylation of HIV-1 Tat by CBP/P300 increases transcription of integrated HIV-1 genome and enhances binding to core histones. Virology 2000; 277:278-95. [PMID: 11080476 DOI: 10.1006/viro.2000.0593] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.4] [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: 11/22/2022]
Abstract
The HIV-1 Tat protein is required for viral replication and is a potent stimulator of viral transcription. Although Tat has been extensively studied in various reductive paradigms, to date there is little information as to how this activator mediates transcription from natural nucleosomally packaged long terminal repeats. Here we show that CREB-binding protein (CBP)/p300 interacts with the HIV-1 Tat protein and serves as a coactivator of Tat-dependent HIV-1 gene expression on an integrated HIV-1 provirus. The site of acetylation of Tat was mapped to the double-lysine motif in a highly conserved region, (49)RKKRRQ(54), of the basic RNA-binding motif of Tat. Using HLM1 cells (HIV-1(+)/Tat(-)), which contain a single copy of full-length HIV-1 provirus with a triple termination codon at the first AUG of the Tat gene, we find that only wild type, and not K50A, K51A, or K50A/K51A alone or in combination of ectopic CBP/p300, is able to produce full-length infectious virions, as measured by p24 gag ELISAs. Tat binds CBP/p300 in the minimal histone acetyltransferase domain (1253-1710) and the binding is stable up to 0.85 M salt wash conditions. Interestingly, wild-type peptide 41-54, and not other Tat peptides, changes the conformation of the CBP/p300 such that it can acquire and bind better to basal factors such as TBP and TFIIB, indicating that Tat may influence the transcription machinery by helping CBP/p300 to recruit new partners into the transcription machinery. Finally, using biotinylated wild-type or acetylated peptides, we find that acetylation decreases Tat's ability to bind the TAR RNA element, as well as to bind basal factors such as TBP, CBP, Core-Pol II, or cyclin T. However, the acetylated Tat peptide is able to bind to core histones on a nucleosome assembled HIV-1 proviral DNA.
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Affiliation(s)
- L Deng
- Department of Biochemistry and Molecular Biology, UMDNJ-New Jersey Medical School, MSB E-635, Newark, New Jersey 07103, USA
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Lee CG, Yoon HJ, Zhu Z, Link H, Wang Z, Gwaltney JM, Landry M, Elias JA. Respiratory syncytial virus stimulation of vascular endothelial cell growth Factor/Vascular permeability factor. Am J Respir Cell Mol Biol 2000; 23:662-9. [PMID: 11062145 DOI: 10.1165/ajrcmb.23.5.4188] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [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: 11/24/2022] Open
Abstract
We hypothesized that respiratory syncytial virus (RSV)-induced pathologies could be mediated, in part, by vascular active cytokines elaborated during virus infection. To address this hypothesis, we determined whether RSV stimulated vascular endothelial cell growth factor (VEGF)/vascular permeability factor (VPF) elaboration in vitro. Supernatants from unstimulated A549 cells and normal human bronchial epithelial cells contained modest levels of VEGF. In contrast, supernatants from RSV-infected cells contained elevated levels of VEGF/VPF. This stimulation was seen after as little as 2 h, was still prominent after 48 h, and, by immunoblot, was specific for the 165- and 121-amino acid isoforms of VEGF/VPF. It was not associated with significant cell cytotoxicity or alterations in VEGF messenger RNA. It did, however, require new protein biosynthesis. In accordance with these findings, the 165- and 121-amino acid isoforms of VEGF/VPF were also found in the nasal washings from patients with RSV infections. These studies demonstrate that RSV is a potent stimulator of VEGF/VPF elaboration and that, in vitro, this stimulation is mediated via a noncytotoxic translational and/or post-translational biosynthetic mechanism. VEGF/VPF may play an important role in the pathogenesis of RSV-induced disorders.
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Affiliation(s)
- C G Lee
- Section of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut 06520-8057, USA
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Lee CG, Heijn M, di Tomaso E, Griffon-Etienne G, Ancukiewicz M, Koike C, Park KR, Ferrara N, Jain RK, Suit HD, Boucher Y. Anti-Vascular endothelial growth factor treatment augments tumor radiation response under normoxic or hypoxic conditions. Cancer Res 2000; 60:5565-70. [PMID: 11034104] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Recent studies in experimental animals have shown that combining antiangiogenic therapy with radiation can enhance tumor response. Whether this enhancement is mainly attributable to angiogenesis inhibition, endothelial cell radiosensitivity, tumor cell apoptosis, or a decrease in the number of hypoxic cells (improved oxygenation) is not known. We designed this study to discern the role of tumor oxygenation. We chose an anti-vascular endothelial growth factor (anti-VEGF) monoclonal antibody (mAb) which has a known target, human VEGF. We also measured interstitial fluid pressure (IFP) to test the hypothesis that the decreased vascular permeability induced by the anti-VEGF mAb can lower IFP. The effect of anti-VEGF mAb on vascular density, partial oxygen tension (pO2), and apoptosis was also measured. Athymic NCr/Sed nu/nu mice bearing 6-mm xenograft of the human glioblastoma multiforme (U87), or colon adenocarcinoma (LS174T) were treated with anti-VEGF mAb injected i.p. on alternate days for a total of six injections at a dosage of 100 microg/injection/mouse. For combined anti-VEGF and radiation, single radiation doses were given under normal blood flow (20 and 30 Gy) or clamped hypoxic conditions (30 and 40 Gy) 24 h after the sixth injection of mAb. The inhibition of the growth of U87 and LS174T tumors by the anti-VEGF mAb was associated with a significant reduction in tumor vascular density and a relatively small increase in the number of apoptotic cells. Compared with size-matched controls, IFP decreased by 74% in LS174T, and 73% in U87 in mice treated with anti-VEGF mAb. After antibody treatment PO2 increased significantly in U87, but did not change in LS174T tumors. Combined treatment induced in U87 tumors a tumor-growth delay (TGD) which was greater than additive; in LS174T except for the 40-Gy hypoxic group, the effect was only additive. In both U87 and LS174T the TGD induced by the antibody was independent of oxygen levels in the tumor at the time of radiation. The fact that the increase in TGD occurred under both normoxic and hypoxic conditions suggests that anti-VEGF mAb treatment can compensate for the resistance to radiation induced by hypoxia.
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Affiliation(s)
- C G Lee
- Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston 02114, USA
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Corne J, Chupp G, Lee CG, Homer RJ, Zhu Z, Chen Q, Ma B, Du Y, Roux F, McArdle J, Waxman AB, Elias JA. IL-13 stimulates vascular endothelial cell growth factor and protects against hyperoxic acute lung injury. J Clin Invest 2000; 106:783-91. [PMID: 10995789 PMCID: PMC381393 DOI: 10.1172/jci9674] [Citation(s) in RCA: 128] [Impact Index Per Article: 5.3] [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: 11/17/2022] Open
Abstract
Hyperoxia is an important cause of acute lung injury. To determine whether IL-13 is protective in hyperoxia, we compared the survival in 100% O(2) of transgenic mice that overexpress IL-13 in the lung and of nontransgenic littermate controls. IL-13 enhanced survival in 100% O(2). One hundred percent of nontransgenic mice died in 4-5 days, whereas 100% of IL-13-overexpressing mice lived for more than 7 days, and many lived 10-14 days. IL-13 also stimulated VEGF accumulation in mice breathing room air, and it interacted with 100% (2) to increase VEGF accumulation further. The 164-amino acid isoform was the major VEGF moiety in bronchoalveolar lavage from transgenic mice in room air, whereas the 120- and 188-amino acid isoforms accumulated in these mice during hyperoxia. In addition, antibody neutralization of VEGF decreased the survival of IL-13-overexpressing mice in 100% (2). These studies demonstrate that IL-13 has protective effects in hyperoxic acute lung injury. They also demonstrate that IL-13, alone and in combination with 100% (2), stimulates pulmonary VEGF accumulation, that this stimulation is isoform-specific, and that the protective effects of IL-13 are mediated, in part, by VEGF.
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Affiliation(s)
- J Corne
- Section of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
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