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Park YM, Noh EM, Lee HY, Shin DY, Lee YH, Kang YG, Na EJ, Kim JH, Yang HJ, Kim MJ, Kim KS, Bae JS, Lee YR. Anti-diabetic effects of Protaetia brevitarsis in pancreatic islets and a murine diabetic model. Eur Rev Med Pharmacol Sci 2021; 25:7508-7515. [PMID: 34919253 DOI: 10.26355/eurrev_202112_27450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE In this study, the antidiabetic efficacy of Protaetia brevitarsis in alloxan-treated pancreatic islets and db/db mice was investigated. P. brevitarsis was tested for alloxan-mediated cytotoxicity and nitric oxide production in mice pancreatic islets. MATERIALS AND METHODS The anti-diabetic effect of P. brevitarsis was also evaluated in db/db mice after 4 weeks of administration. Biochemical analysis, oral glucose tolerance test (OGTT), and pancreatic histological analysis were performed. RESULTS P. brevitarsis displayed hypoglycemic activity in alloxan-treated mice pancreatic islets. Our results showed that P. brevitarsis protects pancreatic islets from cytotoxicity. Moreover, daily oral supplementation with P. brevitarsis for 4 weeks reduced plasma glucose levels without affecting body weight and food intake, elevated glucose tolerance in OGTT, improved blood lipid parameters, inhibited fat accumulation, and restored islet structure of db/db mice. CONCLUSIONS The present study provided evidence for the anti‑diabetic effect of P. brevitarsis in alloxan-treated pancreatic islets and db/db mice. These results suggest that P. brevitarsis may be used as an adjunctive anti-diabetic agent or as a functional food.
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Affiliation(s)
- Y M Park
- INVIVO Co. Ltd., Iksan, Jeonbuk, Korea.
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Hossain M, Park DS, Rahman MS, Ki SJ, Lee YR, Imran KM, Yoon D, Heo J, Lee TJ, Kim YS. Bifidobacterium longum DS0956 and Lactobacillus rhamnosus DS0508 culture-supernatant ameliorate obesity by inducing thermogenesis in obese-mice. Benef Microbes 2020; 11:361-373. [PMID: 32755263 DOI: 10.3920/bm2019.0179] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [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: 12/14/2022]
Abstract
Excessive body fat and the related dysmetabolic diseases affect both developed and developing countries. The aim of this study was to investigate the beneficial role of a bacterial culture supernatant (hereafter: BS) of Lactobacillus and Bifidobacterium and their potential mechanisms of action on white-fat browning and lipolysis. For selection of four candidates among 55 Lactic acid producing bacteria (LAB) from human infant faeces, we evaluated by Oil Red O staining and Ucp1 mRNA quantitation in 3T3-L1 preadipocytes. The expression of browning and lipolysis markers was examined along with in vitro assays. The possible mechanism was revealed by molecular and biological experiments including inhibitor and small interfering RNA (siRNA) assays. In a mouse model, physiological, histological, and biochemical parameters and expression of some thermogenesis-related genes were compared among six experimental groups fed a high-fat diet and one normal-diet control group. The results allow us to speculate that BS treatment promotes browning and lipolysis both in vitro and in vivo. Moreover, the BS may activate thermogenic programs via a mechanism involving PKA-CREB signaling in 3T3-L1 cells. According to our data, we can propose that two LAB strains, Bifidobacterium longum DS0956 and Lactobacillus rhamnosus DS0508, may be good candidates for a dietary supplement against obesity and metabolic diseases; however, further research is required for the development as dietary supplements or drugs.
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Affiliation(s)
- M Hossain
- Institute of Tissue Regeneration, College of Medicine, Soonchunhyang University, Cheonan Chung-nam 31151, Republic of Korea.,Department of Microbiology, College of Medicine, Soonchunhyang University, Soonchunhyang 6 gil 31, Dongnam-Gu, Cheonan Chung-nam 31151, Republic of Korea
| | - D-S Park
- Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology, 181 Ipsin-gil, Jeongeup-si, Jeollabuk-do 580-185, Republic of Korea
| | - M S Rahman
- Institute of Tissue Regeneration, College of Medicine, Soonchunhyang University, Cheonan Chung-nam 31151, Republic of Korea.,Department of Microbiology, College of Medicine, Soonchunhyang University, Soonchunhyang 6 gil 31, Dongnam-Gu, Cheonan Chung-nam 31151, Republic of Korea
| | - S-J Ki
- Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology, 181 Ipsin-gil, Jeongeup-si, Jeollabuk-do 580-185, Republic of Korea
| | - Y R Lee
- Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology, 181 Ipsin-gil, Jeongeup-si, Jeollabuk-do 580-185, Republic of Korea
| | - K M Imran
- Institute of Tissue Regeneration, College of Medicine, Soonchunhyang University, Cheonan Chung-nam 31151, Republic of Korea.,Department of Microbiology, College of Medicine, Soonchunhyang University, Soonchunhyang 6 gil 31, Dongnam-Gu, Cheonan Chung-nam 31151, Republic of Korea
| | - D Yoon
- Institute of Tissue Regeneration, College of Medicine, Soonchunhyang University, Cheonan Chung-nam 31151, Republic of Korea.,Department of Microbiology, College of Medicine, Soonchunhyang University, Soonchunhyang 6 gil 31, Dongnam-Gu, Cheonan Chung-nam 31151, Republic of Korea
| | - J Heo
- International Agricultural Development and Cooperation Center, Chonbuk National University, Jeonju 54896, Republic of Korea
| | - T-J Lee
- Department of Anatomy, College of Medicine, Yeungnam University, Daegu 42415, Republic of Korea
| | - Y-S Kim
- Institute of Tissue Regeneration, College of Medicine, Soonchunhyang University, Cheonan Chung-nam 31151, Republic of Korea.,Department of Microbiology, College of Medicine, Soonchunhyang University, Soonchunhyang 6 gil 31, Dongnam-Gu, Cheonan Chung-nam 31151, Republic of Korea
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Muratovic D, Findlay DM, Cicuttini FM, Wluka AE, Lee YR, Edwards S, Kuliwaba JS. Bone marrow lesions in knee osteoarthritis: regional differences in tibial subchondral bone microstructure and their association with cartilage degeneration. Osteoarthritis Cartilage 2019; 27:1653-1662. [PMID: 31306782 DOI: 10.1016/j.joca.2019.07.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 06/19/2019] [Accepted: 07/03/2019] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The aim of this study was to investigate how bone microstructure within bone marrow lesions (BMLs) relates to the bone and cartilage across the whole human tibial plateau. DESIGN Thirty-two tibial plateaus from patients with osteoarthritis (OA) at total knee arthroplasty and eleven age-matched non-OA controls, were scanned ex vivo by MRI to identify BMLs and by micro CT to quantitate the subchondral (plate and trabecular) bone microstructure. For cartilage evaluation, specimens were processed histologically. RESULTS BMLs were detected in 75% of the OA samples (OA-BML), located predominantly in the anterior-medial (AM) region. In contrast to non-OA control and OA-no BML, in OA-BML differences in microstructure were significantly more evident between subregions. In OA-BML, the AM region contained the most prominent structural alterations. Between-group comparisons showed that the AM region of the OA-BML group had significantly higher histological degeneration (OARSI grade) (P < .0001, P < .05), thicker subchondral plate (P < .05, P < .05), trabeculae that are more anisotropic (P < .0001, P < .05), well connected (P < .05, P = n.s), and more plate-like (P < 0.05, P < 0.05), compared to controls and OA-no BML at this site. Compared to controls, OA-no BML had significantly higher OARSI grade (P < .0001), and lower trabecular number (P < .05). CONCLUSION In established knee OA, both the extent of cartilage damage and microstructural degeneration of the subchondral bone were dependent on the presence of a BML. In OA-no BML, bone microstructural alterations are consistent with a bone attrition phase of the disease. Thus, the use of BMLs as MRI image-based biomarkers appear to inform on the degenerative state within the osteochondral unit.
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Affiliation(s)
- D Muratovic
- Centre for Orthopaedic and Trauma Research, Discipline of Orthopaedics and Trauma, The University of Adelaide, Adelaide, Australia.
| | - D M Findlay
- Centre for Orthopaedic and Trauma Research, Discipline of Orthopaedics and Trauma, The University of Adelaide, Adelaide, Australia.
| | - F M Cicuttini
- Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Australia.
| | - A E Wluka
- Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Australia.
| | - Y R Lee
- Centre for Orthopaedic and Trauma Research, Discipline of Orthopaedics and Trauma, The University of Adelaide, Adelaide, Australia.
| | - S Edwards
- Adelaide Health Technology Assessment (AHTA), School of Public Health, The University of Adelaide, Adelaide, Australia.
| | - J S Kuliwaba
- Centre for Orthopaedic and Trauma Research, Discipline of Orthopaedics and Trauma, The University of Adelaide, Adelaide, Australia.
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Park JG, Park SY, Tak WY, Kweon YO, Jang SY, Lee YR, Hur K, Lee HJ, Lee HW. Early complications after percutaneous radiofrequency ablation for hepatocellular carcinoma: an analysis of 1,843 ablations in 1,211 patients in a single centre: experience over 10 years. Clin Radiol 2017; 72:692.e9-692.e15. [PMID: 28364952 DOI: 10.1016/j.crad.2017.03.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 01/24/2017] [Accepted: 03/01/2017] [Indexed: 12/12/2022]
Abstract
AIM To evaluate the incidence of adverse events and associated factors after radiofrequency ablation (RFA) in patients with hepatocellular carcinoma within 30 days. MATERIALS AND METHODS The early complications that occurred within 30 days after RFA at a single institution from January 2000 to July 2010 were reviewed in order to evaluate the morbidity, mortality, and risk factors associated with the complications. In total, 1,211 patients (845 men, 70.5%) with a mean age of 68 years (range, 27-88 years) underwent 1,843 RFA procedures. RESULTS The overall incidence rate of complications was 6.8% (125 cases). Major complications (n=36, 2%) included liver abscess (n=15, 0.8%), intraperitoneal bleeding (n=8, 0.4%), liver failure (n=5, 0.3%), variceal bleeding (n=3, 0.2%), haemothorax (n=2, 0.1%), cholecystitis (n=2, 0.1%), and bowel perforation (n=1, 0.1%). Among the minor complications (n=89, 4.8%), the most common was the post RFA syndrome accompanied by pain and fever (n=75, 4.1%). Other minor complications included significant pleural effusion (n=7, 0.4%), skin wound infection (n=4, 0.2%), and thermal injuries to the skin (n=3, 0.2%). Procedural infections significantly increased with tumour size (OR=1.379; 95% confidence interval [CI], 1.191-1.579; p<0.001), and multiple overlapping ablations (OR=1.118; 95% CI, 1.019-1.227, p=0.018). Thrombocytopenia (<50,000/μl), prothrombin time, and serum albumin level were significantly associated with post-RFA bleeding episodes (p=0.041, p=0.021, and p=0.003, respectively). The overall mortality rate was 0.3% (three cases of hepatic failure, two case of sepsis, and one case of renal failure). CONCLUSIONS RFA is a safe and effective local treatment for hepatocellular carcinoma. Careful selection of patients and appropriate RFA planning could decrease procedural mortality and morbidity.
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Affiliation(s)
- J G Park
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, College of Medicine, Yeungnam University, Daegu, Republic of Korea
| | - S Y Park
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Republic of Korea.
| | - W Y Tak
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Republic of Korea.
| | - Y O Kweon
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - S Y Jang
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Y R Lee
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - K Hur
- Department of Biochemistry and Cell Biology, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - H J Lee
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, College of Medicine, Yeungnam University, Daegu, Republic of Korea
| | - H W Lee
- Department of Pathology, Dongsan Medical Center, School of Medicine, Keimyung University, Daegu, Republic of Korea
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Hwang JK, Erkhembaatar M, Gu DR, Lee SH, Lee CH, Shin DM, Lee YR, Kim MS. Glechoma hederacea Suppresses RANKL-mediated Osteoclastogenesis. J Dent Res 2014; 93:685-90. [PMID: 24850617 DOI: 10.1177/0022034514536579] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 04/23/2014] [Indexed: 11/17/2022] Open
Abstract
Glechoma hederacea (GH), commonly known as ground-ivy or gill-over-the-ground, has been extensively used in folk remedies for relieving symptoms of inflammatory disorders. However, the molecular mechanisms underlying the therapeutic action of GH are poorly understood. Here, we demonstrate that GH constituents inhibit osteoclastogenesis by abrogating receptor activator of nuclear κ-B ligand (RANKL)-induced free cytosolic Ca(2+) ([Ca(2+)]i) oscillations. To evaluate the effect of GH on osteoclastogenesis, we assessed the formation of multi-nucleated cells (MNCs), enzymatic activity of tartrate-resistant acidic phosphatase (TRAP), expression of nuclear factor of activated T-cells cytoplasmic 1 (NFATc1), and [Ca(2+)]i alterations in response to treatment with GH ethanol extract (GHE) in primarily cultured bone marrow-derived macrophages (BMMs). Treatment of RANKL-stimulated or non-stimulated BMMs with GHE markedly suppressed MNC formation, TRAP activity, and NFATc1 expression in a dose-dependent manner. Additionally, GHE treatment induced a large transient elevation in [Ca(2+)]i while suppressing RANKL-induced [Ca(2+)]i oscillations, which are essential for NFATc1 activation. GHE-evoked increase in [Ca(2+)]i was dependent on extracellular Ca(2+) and was inhibited by 1,4-dihydropyridine (DHP), inhibitor of voltage-gated Ca(2+) channels (VGCCs), but was independent of store-operated Ca(2+) channels. Notably, after transient [Ca(2+)] elevation, treatment with GHE desensitized the VGCCs, resulting in an abrogation of RANKL-induced [Ca(2+)]i oscillations and MNC formation. These findings demonstrate that treatment of BMMs with GHE suppresses RANKL-mediated osteoclastogenesis by activating and then desensitizing DHP-sensitive VGCCs, suggesting potential applications of GH in the treatment of bone disorders, such as periodontitis, osteoporosis, and rheumatoid arthritis.
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Affiliation(s)
- J K Hwang
- Center for Metabolic Function Regulation (CMFR), Wonkwang University School of Medicine, Iksan 570-749, Republic of Korea Department of Oral Biochemistry, College of Dentistry, Wonkwang University, 344-2 Shinyong-dong, Iksan 570-749, Republic of Korea
| | - M Erkhembaatar
- Department of Oral Physiology, College of Dentistry, Wonkwang University, Iksan 570-749, Republic of Korea
| | - D R Gu
- Center for Metabolic Function Regulation (CMFR), Wonkwang University School of Medicine, Iksan 570-749, Republic of Korea Department of Oral Microbiology and Immunology, College of Dentistry, Wonkwang University, Iksan 570-749, Republic of Korea
| | - S H Lee
- Center for Metabolic Function Regulation (CMFR), Wonkwang University School of Medicine, Iksan 570-749, Republic of Korea Department of Oral Microbiology and Immunology, College of Dentistry, Wonkwang University, Iksan 570-749, Republic of Korea
| | - C H Lee
- Microelectronics and Display, Next Generation Industrial Radiation Technology RIC, Wonkwang University, Iksan 570-749, Republic of Korea
| | - D M Shin
- Department of Oral Biology, BK21 PLUS Project, Yonsei University College of Dentistry, Seoul 120-752
| | - Y R Lee
- Center for Metabolic Function Regulation (CMFR), Wonkwang University School of Medicine, Iksan 570-749, Republic of Korea Department of Oral Biochemistry, College of Dentistry, Wonkwang University, 344-2 Shinyong-dong, Iksan 570-749, Republic of Korea
| | - M S Kim
- Department of Oral Physiology, College of Dentistry, Wonkwang University, Iksan 570-749, Republic of Korea Microelectronics and Display, Next Generation Industrial Radiation Technology RIC, Wonkwang University, Iksan 570-749, Republic of Korea
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Chan SH, Huang WC, Chang JW, Chang KJ, Kuo WH, Wang MY, Lin KY, Uen YH, Hou MF, Lin CM, Jang TH, Tu CW, Lee YR, Lee YH, Tien MT, Wang LH. MicroRNA-149 targets GIT1 to suppress integrin signaling and breast cancer metastasis. Oncogene 2014; 33:4496-507. [PMID: 24608434 PMCID: PMC4155808 DOI: 10.1038/onc.2014.10] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [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: 07/09/2013] [Revised: 11/28/2013] [Accepted: 11/29/2013] [Indexed: 12/16/2022]
Abstract
Metastasis is the predominant cause of death in breast cancer patients. Several lines of evidence have shown that microRNAs (miRs) can have an important role in cancer metastasis. Using isogenic pairs of low and high metastatic lines derived from a human breast cancer line, we have identified miR-149 to be a suppressor of breast cancer cell invasion and metastasis. We also identified GIT1 (G-protein-coupled receptor kinase-interacting protein 1) as a direct target of miR-149. Knockdown of GIT1 reduced migration/invasion and metastasis of highly invasive cells. Re-expression of GIT1 significantly rescued miR-149-mediated inhibition of cell migration/invasion and metastasis. Expression of miR-149 impaired fibronectin-induced focal adhesion formation and reduced phosphorylation of focal adhesion kinase and paxillin, which could be restored by re-expression of GIT1. Inhibition of GIT1 led to enhanced protein degradation of paxillin and α5β1 integrin via proteasome and lysosome pathways, respectively. Moreover, we found that GIT1 depletion in metastatic breast cancer cells greatly reduced α5β1-integrin-mediated cell adhesion to fibronectin and collagen. Low level of miR-149 and high level of GIT1 was significantly associated with advanced stages of breast cancer, as well as with lymph node metastasis. We conclude that miR-149 suppresses breast cancer cell migration/invasion and metastasis by targeting GIT1, suggesting potential applications of the miR-149-GIT1 pathway in clinical diagnosis and therapeutics.
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Affiliation(s)
- S-H Chan
- Institute of Molecular and Genomic Medicine, National Health Research Institute, Miaoli, Taiwan
| | - W-C Huang
- 1] Institute of Molecular and Genomic Medicine, National Health Research Institute, Miaoli, Taiwan [2] Department of Life Science, National Central University, Taoyuan, Taiwan
| | - J-W Chang
- Institute of Molecular and Genomic Medicine, National Health Research Institute, Miaoli, Taiwan
| | - K-J Chang
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - W-H Kuo
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - M-Y Wang
- Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - K-Y Lin
- Chi Mei Medical Center, Department of Medical Research, Tainan, Taiwan
| | - Y-H Uen
- Chi Mei Medical Center, Department of Medical Research, Tainan, Taiwan
| | - M-F Hou
- Department of Surgery, Kaohsiung Medical University Chung-Ho Memorial Hospital, Kaohsiung, Taiwan
| | - C-M Lin
- Institute of Molecular and Genomic Medicine, National Health Research Institute, Miaoli, Taiwan
| | - T-H Jang
- Institute of Molecular and Genomic Medicine, National Health Research Institute, Miaoli, Taiwan
| | - C-W Tu
- Department of Surgery, Chiayi Christian Hospital, Chiayi, Taiwan
| | - Y-R Lee
- Department of Medical Research, Chiayi Christian Hospital, Chiayi, Taiwan
| | - Y-H Lee
- Department of Pathology, National Taiwan University Hospital Hsin-Chu Branch, Hsinchu, Taiwan
| | - M-T Tien
- Biomedical Technology and Device Research Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan
| | - L-H Wang
- 1] Institute of Molecular and Genomic Medicine, National Health Research Institute, Miaoli, Taiwan [2] Department of Life Science, National Central University, Taoyuan, Taiwan [3] Department of Microbiology, Mount Sinai School of Medicine, New York, NY, USA
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Kim JS, Noh EM, Lee YR, Hwang BM, Jung SH, Youn HJ, Lee SJ. Abstract P5-07-04: Aurora kinase regulates PKC-mediated MMP-9 expression and invasion in MCF-7 breast cancer cells. Cancer Res 2012. [DOI: 10.1158/0008-5472.sabcs12-p5-07-04] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Aurora kinase is a novel family of serine/threonine kinases. Elevated expression of aurora kinase A and B is observed in many tumor cells, and dysregulation of aurora kinase has been linked to tumorigenesis. Therefore, a number of studies focused in their oncogene activities as anti-tumor targets. Matrix metalloproteinase-9 (MMP-9), which degrades the extracellular matrix (ECM) and it is important process for breast cancer cell invasion. MMP-9 can be stimulated by activation of various cellular signaling pathways including protein kinase C (PKC), and mitogen-activated protein kinase (MAPKs), activator protein-1 (AP-1) and nuclear factor-kappaB (NF-κB) signaling pathways. Here, we show that 12-O-tetradecanoylphorbol-13-acetate (TPA), a directly PKC activator stimulation resulted in an up-regulation and phosphorlyation of aurora kinases in MCF-7 breast cancer cells. Also, Results showed that inhibition of the aurora kinases suppressed TPA-induced MMP-9 secretion/expression and cell invasion through suppression of NF-κB, AP-1, and MAPKs in MCF-7 breast cancer cell. In conclusion, this study provides new insight into the novel role of aurora kinase for expression of MMP-9 by TPA and regulation of aurora kinase by TPA through MAPKs signaling pathway.
Citation Information: Cancer Res 2012;72(24 Suppl):Abstract nr P5-07-04.
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Affiliation(s)
- JS Kim
- Institute for Medical Sciences Chonbuk National University Medical School, Jeonju, Republic of Korea; Chonbuk National University Medical School, Jeonju, Republic of Korea; School of Dentistry, Wonkwang University, Iksan, Republic of Korea; College of Phamacy, Ewha Womans University, Seoul, Republic of Korea
| | - EM Noh
- Institute for Medical Sciences Chonbuk National University Medical School, Jeonju, Republic of Korea; Chonbuk National University Medical School, Jeonju, Republic of Korea; School of Dentistry, Wonkwang University, Iksan, Republic of Korea; College of Phamacy, Ewha Womans University, Seoul, Republic of Korea
| | - YR Lee
- Institute for Medical Sciences Chonbuk National University Medical School, Jeonju, Republic of Korea; Chonbuk National University Medical School, Jeonju, Republic of Korea; School of Dentistry, Wonkwang University, Iksan, Republic of Korea; College of Phamacy, Ewha Womans University, Seoul, Republic of Korea
| | - B-M Hwang
- Institute for Medical Sciences Chonbuk National University Medical School, Jeonju, Republic of Korea; Chonbuk National University Medical School, Jeonju, Republic of Korea; School of Dentistry, Wonkwang University, Iksan, Republic of Korea; College of Phamacy, Ewha Womans University, Seoul, Republic of Korea
| | - SH Jung
- Institute for Medical Sciences Chonbuk National University Medical School, Jeonju, Republic of Korea; Chonbuk National University Medical School, Jeonju, Republic of Korea; School of Dentistry, Wonkwang University, Iksan, Republic of Korea; College of Phamacy, Ewha Womans University, Seoul, Republic of Korea
| | - HJ Youn
- Institute for Medical Sciences Chonbuk National University Medical School, Jeonju, Republic of Korea; Chonbuk National University Medical School, Jeonju, Republic of Korea; School of Dentistry, Wonkwang University, Iksan, Republic of Korea; College of Phamacy, Ewha Womans University, Seoul, Republic of Korea
| | - SJ Lee
- Institute for Medical Sciences Chonbuk National University Medical School, Jeonju, Republic of Korea; Chonbuk National University Medical School, Jeonju, Republic of Korea; School of Dentistry, Wonkwang University, Iksan, Republic of Korea; College of Phamacy, Ewha Womans University, Seoul, Republic of Korea
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Lee YR, Hwang JK, Lee HS, Cheon YJ, Ryu JH, Lee SI, Kwak HB, Lee SM, Kim JS, Park JW, Jeon R, Park BH. SPA0355, a thiourea analogue, inhibits inflammatory responses and joint destruction in fibroblast-like synoviocytes and mice with collagen-induced arthritis. Br J Pharmacol 2012; 164:794-806. [PMID: 21501144 DOI: 10.1111/j.1476-5381.2011.01441.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND AND PURPOSE NF-κB has been implicated as a therapeutic target for the treatment of rheumatoid arthritis. We previously synthesized a thiourea analogue, SPA0355, which suppressed NF-κB activity. Here we have assessed the anti-inflammatory and anti-arthritic effects of SPA0355. EXPERIMENTAL APPROACH We evaluated the effects of SPA0355 on human rheumatoid fibroblast-like synoviocytes in vitro and on collagen-induced arthritis (CIA) in mice in vivo. KEY RESULTS In vitro experiments demonstrated that SPA0355 suppressed chemokine production, matrix metalloproteinase secretion and cell proliferation induced by TNF-α in rheumatoid fibroblast-like synoviocytes. In addition, SPA0355 inhibited osteoclast differentiation induced by macrophage colony-stimulating factor and the receptor activator of NF-κB ligand, in bone marrow macrophages. Mice with CIA that were pretreated with SPA0355 had a lower cumulative disease incidence and severity of arthritis, based on hind paw thickness, radiological and histopathological findings, and inflammatory cytokine levels, than mice treated with vehicle. Mice treated with SPA0355, after the onset of CIA, also showed significantly decreased disease incidence and joint oedema. The in vitro and in vivo protective effects of SPA0355 were mediated by inhibition of the NF-κB signalling pathway. CONCLUSION AND IMPLICATIONS Taken together, these results suggested that using SPA0355 to block the NF-κB pathway in rheumatoid joints reduced both the inflammatory responses and tissue destruction. Therefore, SPA0355 may have therapeutic value in preventing or delaying joint destruction in patients with rheumatoid arthritis.
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Affiliation(s)
- Y R Lee
- Department of Biochemistry, Research Institute for Endocrine Sciences, and Diabetes Research Center, Chonbuk National University Medical School, Jeonju, Jeonbuk, Korea
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Chang YY, Chen SY, Wu HH, Weng SC, Chu CH, Lee YR, Tang MT, Stetsko Y, Shew BY, Yabashi M, Chang SL. Diffraction-enhanced beam-focusing for X-rays in curved multi-plate crystal cavity. Opt Express 2010; 18:7886-7892. [PMID: 20588629 DOI: 10.1364/oe.18.007886] [Citation(s) in RCA: 2] [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: 05/29/2023]
Abstract
Unusual x-ray focusing effect is reported for parabolic curved multi-plate x-ray crystal cavities of silicon consisting of compound refractive lenses (CRL). The transmitted beam of the (12 4 0) back reflection near 14.4388 keV from these monolithic silicon crystal devices exhibits extraordinary focusing enhancement, such that the focal length is reduced by as much as 18% for 2-beam and 56% for 24-beam diffraction from the curved crystal cavity. This effect is attributed to the presence of the involved Bragg diffractions, in which the wavevector of the transmitted beam is bent further when traversing several curved crystal surfaces.
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Affiliation(s)
- Y-Y Chang
- Department of Physics, National Tsing Hua University, Hsinchu, ROC 300 Taiwan
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Chung EY, Kim BH, Lee IJ, Roh E, Oh SJ, Kwak JA, Lee YR, Ahn B, Nam SY, Han SB, Kim Y. The benzoxathiolone LYR-71 down-regulates interferon-gamma-inducible pro-inflammatory genes by uncoupling tyrosine phosphorylation of STAT-1 in macrophages. Br J Pharmacol 2010; 158:1971-81. [PMID: 19922538 DOI: 10.1111/j.1476-5381.2009.00496.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND AND PURPOSE Benzoxathiolone derivatives have shown anti-inflammatory and immunomodulatory potential in acne and psoriatic disorders. However, little is known about the molecular basis for these pharmacological effects. In this study, we decided to investigate the anti-inflammatory actions of a benzoxathiolone derivative LYR-71, 6-methyl-2-propylimino-6,7-dihydro-5H-benzo[1,3]oxathiol-4-one, in interferon (IFN)-gamma-activated macrophages. EXPERIMENTAL APPROACH RAW 264.7 macrophages or primary macrophages, derived from bone marrow of C3H/HeJ mice, were stimulated with IFN-gamma in the presence of LYR-71. Nitric oxide (NO) or chemokine production was measured by Griess reaction or enzyme-linked immunosorbent assay. RAW 264.7 cells were used to examine the molecular mechanisms of LYR-71 in modulating IFN-gamma-induced inflammatory responses. KEY RESULTS LYR-71 down-regulated IFN-gamma-induced transcription of inducible NO synthase, IFN-gamma-inducible protein-10 and the monokine induced by IFN-gamma genes in macrophages. This effect was mediated by uncoupling tyrosine phosphorylation of the signal transducer and activator of transcription (STAT)-1 in response to IFN-gamma. LYR-71 directly inhibited the in vitro catalytic activity of Janus kinase (JAK)-2. Further, the inhibitory actions of LYR-71 on IFN-gamma-induced STAT-1 phosphorylation and NO production were consistently abolished in the presence of peroxyvanadate, implying another target dependent on protein tyrosine phosphatase. CONCLUSIONS AND IMPLICATIONS Taken together, LYR-71 could restrain IFN-gamma-induced inflammatory responses through uncoupling the tyrosine phosphorylation of STAT-1, an activation index of JAK-STAT-1 signalling, in macrophages. These results may provide a molecular mechanism underlying anti-inflammatory actions shown by benzoxathiolone derivatives.
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Affiliation(s)
- E-Y Chung
- College of Pharmacy, Chungbuk National University, Cheongju, Korea
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11
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Chou LW, Wu HC, Lee YR, Jiang JC, Su C, Lin JC. Atomic structure of the Ag/Ge(111)-(sq.rt.(3) x sq.rt.(3)) surface: From scanning tunneling microscopy observation to theoretical study. J Chem Phys 2009; 131:224705. [PMID: 20001074 DOI: 10.1063/1.3268776] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The atomic structure of the Ag/Ge(111)-(sq.rt.(3) x sq.rt.(3))R30 degrees surface is studied by scanning tunneling microscopy (STM) and the density functional theory (DFT) calculations. Our STM images have shown a structure which is different from the widely accepted honeycomb-chained-triangle (HCT) model before. The structure is similar to the inequivalent triangle (IET) model found for the Ag/Si(111)-(sq.rt.(3) x sq.rt(3))R30 degrees surface. This model proposed two types of silver triangles with different sizes in the unit cell, corresponding to the bright spots and the dark spots in the STM image. A distinguishable hexagonal pattern of the IET structure was well disclosed in the temperature range from 100 to 473 K in our STM studies for Ag/Ge(111)-(sq.rt.(3) x sq.rt.(3))R30 degrees. Furthermore, the result of the DFT calculations showed that the IET structure is 0.20 eV energetically more stable than the HCT model. Besides, the Ge triangles, which were not disclosed in earlier STM research, are found in this study.
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Affiliation(s)
- L-W Chou
- Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 106, Taiwan, Republic of China
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Lee YR, Powell N, Bonatti H, Sawyer RG, Barroso L, Pruett TL, Sifri CD, Volles D. Early development of lactic acidosis with short term linezolid treatment in a renal recipient. J Chemother 2009; 20:766-7. [PMID: 19129081 DOI: 10.1179/joc.2008.20.6.766] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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13
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Noh EM, Kim JS, Hur H, Park BH, Song EK, Han MK, Kwon KB, Yoo WH, Shim IK, Lee SJ, Youn HJ, Lee YR. Cordycepin inhibits IL-1beta-induced MMP-1 and MMP-3 expression in rheumatoid arthritis synovial fibroblasts. Rheumatology (Oxford) 2009; 48:45-8. [PMID: 19056796 DOI: 10.1093/rheumatology/ken417] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
OBJECTIVE MMP is a key enzyme in the degradation of extracellular matrices, and its expression plays important roles in inflammatory diseases. Cordycepin (3'-deoxyadenosine), a bioactive compound of Cordyceps militaris, has been shown to exhibit many pharmacological activities, such as anti-cancer, anti-inflammatory and anti-infection activities. In this study, we aimed at the inhibitory effect of cordycepin on IL-1beta-induced MMP-1 and MMP-3 expression as well as the molecular basis using RA synovial fibroblasts (RASFs). METHODS RASFs were isolated from synovial tissue obtained from 12 patients with RA and cultured in monolayer. Expression of MMP-1 and MMP-3 was evaluated using western blotting and real-time PCR. Chemokines were analysed by ELISA. The phosphorylation of mitogen-activated protein kinase was measured by western blotting. Electrophoretic mobility shift assay was performed to evaluate binding activities of DNA to nuclear factor-kappaB (NF-kappaB) and activator protein-1 (AP-1). RESULTS Cordycepin inhibited IL-1beta-induced MMP-1 and MMP-3 expressions in RASFs in a dose-dependent manner. Among various chemokines [such as monocyte chemoattractant protein-1 (MCP-1), GRO-alpha, regulated upon activation, normal T-cell expressed and presumably secreted (RANTES) and epithelial neutrophil activating peptide 78 (ENA-78)], cordycepin specifically blocked IL-1beta-induced ENA-78 production in RASF. Moreover, cordycepin significantly inhibited IL-1beta-induced p38/JNK and AP-1 activation, but not extracellular signal-regulated kinase (ERK) and NF-kappaB activation. CONCLUSIONS Cordycepin is a potent inhibitor of IL-1beta-induced chemokine production and MMP expression and strongly blocks the p38/JNK/AP-1 signalling pathway in RASFs.
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Affiliation(s)
- E-M Noh
- Department of Biochemistry, Institute for Medical Science, Chonbuk National University Medical School, Jeonju, South Korea
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14
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Jo GB, Choi JH, Christensen CA, Lee YR, Pasquini TA, Ketterle W, Pritchard DE. Matter-wave interferometry with phase fluctuating Bose-Einstein condensates. Phys Rev Lett 2007; 99:240406. [PMID: 18233429 DOI: 10.1103/physrevlett.99.240406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2007] [Indexed: 05/25/2023]
Abstract
Elongated Bose-Einstein condensates (BECs) exhibit strong spatial phase fluctuations even well below the BEC transition temperature. We demonstrate that atom interferometers using such condensates are robust against phase fluctuations; i.e., the relative phase of the split condensate is reproducible despite axial phase fluctuations. However, larger phase fluctuations limit the coherence time, especially in the presence of some asymmetries in the two wells of the interferometer.
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Affiliation(s)
- G-B Jo
- MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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15
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Lee KS, Park SJ, Kim SR, Min KH, Lee KY, Choe YH, Hong SH, Lee YR, Kim JS, Hong SJ, Lee YC. Inhibition of VEGF blocks TGF-beta1 production through a PI3K/Akt signalling pathway. Eur Respir J 2007; 31:523-31. [PMID: 18057050 DOI: 10.1183/09031936.00125007] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Vascular endothelial growth factor (VEGF) is a mediator of airway inflammation and remodelling in asthma. Transforming growth factor (TGF)-beta(1) plays pivotal roles in diverse biological processes, including tissue remodelling and repair in a number of chronic lung diseases. However, there are few studies elucidating the interactions between VEGF and TGF-beta(1) in allergic airway disease. A murine model of allergic airway disease was used to define the mechanism by which VEGF induces subepithelial fibrosis and to investigate a potential relationship between VEGF and TGF-beta(1) and the mechanisms by which VEGF signalling regulates TGF-beta(1) expression in allergic airway disease. The ovalbumin (OVA)-inhaled murine model revealed the following typical pathophysiological features of allergic airway disease in the lungs: increased numbers of inflammatory cells of the airways, airway hyperresponsiveness, increased peribronchial fibrosis, and increased levels of VEGF and TGF-beta(1). Administration of VEGF inhibitors reduced the pathophysiological signs of allergic airway disease and decreased the increased TGF-beta(1) levels and peribronchial fibrosis, including phosphoinositide 3-kinase (PI3K) activity after OVA inhalation. In addition, the increased TGF-beta(1) levels and collagen deposition after OVA inhalation were decreased by administration of PI3K inhibitors. These results suggest that inhibition of vascular endothelial growth factor attenuates peribronchial fibrosis, at least when mediated by regulation of transforming growth factor-beta(1) expression through phosphoinositide 3-kinase/Akt pathway in a murine model of allergic airway disease.
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Affiliation(s)
- K S Lee
- Dept of Internal Medicine, Chonbuk National University Medical School, San 2-20 Geumam-dong, Deokjin-gu, Jeonju, Jeonbuk 561-180, South Korea.
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16
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Wu HC, Tsai CS, Chou LW, Lee YR, Jiang JC, Su C, Lin JC. A scanning tunneling microscopy study of distyrylbenzene on Ag/Ge(111)-(sqr rt of 3 x sqr rt of 3)R30 degrees. Langmuir 2007; 23:12521-12528. [PMID: 17973407 DOI: 10.1021/la701845p] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The adsorption and self-organized monolayers of trans,trans-distyrylbenzene (tt-DSB) and cis,cis-distyrylbenzene (cc-DSB) on Ag/Ge(111)-(sqr rt of 3 x sqr rt of 3)R30 degrees (Ag/Ge(111)-sqr rt of 3) were studied by low-temperature scanning tunneling microscopy (STM) in ultrahigh vacuum. tt-DSB and cc-DSB overlayers were prepared by vapor deposition at a substrate temperature of 200 K and imaged after the samples were cooled to 100 K. High-resolution images allow identification of the internal structure of individual tt-DSB molecules with three phenyl rings and their molecular arrangements on the Ag/Ge(111)-sqr rt of 3 surface. It is found that the intermolecular distance between two terminal phenyl rings in tt-DSB is about twice the lattice constant of Ag/Ge(111)-sqr rt of 3. Such a lattice match makes Ag/Ge(111)-sqr rt of 3 an ideal substrate for tt-DSB self-organization and the formation of a (3 x 1) overlayer unit cell. The structural model and the molecule registry corresponding to STM images for the adlayers of tt-DSB on Ag/Ge(111)-sqr rt of 3 are proposed and discussed. For cc-DSB adsorption on Ag/Ge(111)-sqr rt of 3, uniform molecular overlayers with two discernible molecular images corresponding to two major types of cc-DSB conformers were observed. The coexistence of multiple conformers and the mismatch of molecular dimension of cc-DSB with the substrate unit cell length limit the growth of large cc-DSB domains.
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Affiliation(s)
- H C Wu
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan
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Lee YR, Gray A, Tischler J, Czoschke P, Hong H, Chang SL, Chiang TC. Quantum oscillations and beats in X-ray diffraction during film growth. Phys Rev Lett 2007; 99:156103. [PMID: 17995191 DOI: 10.1103/physrevlett.99.156103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2007] [Indexed: 05/25/2023]
Abstract
X-ray diffraction from a growing film at an anti-Bragg point should exhibit bilayer oscillations caused by interference. In an experiment of TiN film growth by laser ablation onto sapphire, an unexpected beating envelope function is found to modulate the oscillations. The successive nodes and antinodes are identified with the development of new growth domains separated by one atomic layer in thickness. This effect allows atomic layer counting of the film thickness distribution. The results imply that the growth is not characterized by a continuum stochastic process, as usually assumed.
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Affiliation(s)
- Y-R Lee
- Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080, USA
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18
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Jo GB, Choi JH, Christensen CA, Pasquini TA, Lee YR, Ketterle W, Pritchard DE. Phase-sensitive recombination of two bose-einstein condensates on an atom chip. Phys Rev Lett 2007; 98:180401. [PMID: 17501545 DOI: 10.1103/physrevlett.98.180401] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2007] [Indexed: 05/15/2023]
Abstract
The recombination of two split Bose-Einstein condensates on an atom chip is shown to result in heating which depends on the relative phase of the two condensates. This heating reduces the number of condensate atoms between 10% and 40% and provides a robust way to read out the phase of an atom interferometer without the need for ballistic expansion. The heating may be caused by the dissipation of dark solitons created during the merging of the condensates.
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Affiliation(s)
- G-B Jo
- MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Tang SJ, Lee YR, Chang SL, Miller T, Chiang TC. Umklapp-mediated quantization of electronic states in Ag films on Ge(111). Phys Rev Lett 2006; 96:216803. [PMID: 16803266 DOI: 10.1103/physrevlett.96.216803] [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] [Received: 03/25/2006] [Indexed: 05/10/2023]
Abstract
We employ angle-resolved photoemission to study the electronic structure of atomically uniform films of Ag grown on Ge(111). A new kind of quantum well state is observed near a specific emission direction away from the surface normal. In contrast with the usual quantum well state arising from electron confinement by specular reflections at the surface and interface of the film, the new kind involves retroreflections, or umklapp reflections, at the interface. It requires four reflections, instead of the usual two reflections, to complete a coherent interference path.
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Affiliation(s)
- S-J Tang
- Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080, USA
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Oshita Y, Lee YR, Ogawa H, Yamazaki M, Tsuboi R. Endothelin-1 secreted from keratinocytes stimulates fibroblast-embedded collagen gel contraction in vitro. J Dermatol Sci 2006; 43:57-9. [PMID: 16730953 DOI: 10.1016/j.jdermsci.2006.02.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2005] [Revised: 01/24/2006] [Accepted: 02/09/2006] [Indexed: 01/23/2023]
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Abstract
The CT halo sign indicates ground glass attenuation surrounding a pulmonary nodule on CT. Although it was initially proposed as an early, specific finding of invasive pulmonary aspergillosis, it can be caused by many other pathological conditions such as infection, neoplastic and inflammatory diseases. The halo of ground glass attenuation pathologically represents pulmonary haemorrhage, tumour infiltration, or non-haemorrhagic inflammatory processes. Although non-specific, this sign is important because the clinical setting and associated radiological features may give a clue to the differential diagnosis. In this review, we demonstrate the spectrum of pulmonary diseases showing the "CT halo sign" on thin-section CT and discuss their radiological and clinical features.
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Affiliation(s)
- Y R Lee
- Department of Diagnostic Radiology, College of Medicine, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul 133-792, Korea
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Chang SL, Stetsko YP, Tang MT, Lee YR, Sun WH, Yabashi M, Ishikawa T. X-ray resonance in crystal cavities: realization of Fabry-Perot resonator for hard x rays. Phys Rev Lett 2005; 94:174801. [PMID: 15904302 DOI: 10.1103/physrevlett.94.174801] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2004] [Indexed: 05/02/2023]
Abstract
X-ray back diffraction from monolithic two silicon crystal plates of 25-150 microm thickness and a 40-150 microm gap using synchrotron radiation of energy resolution DeltaE = 0.36 meV at 14.4388 keV clearly show resonance fringes inside the energy gap and the total-reflection range for the (12 4 0) reflection. This cavity resonance results from the coherent interaction between the x-ray wave fields generated by the two plates with a gap smaller than the x-ray coherence length. This finding opens up new opportunities for high-resolution and phase-contrast x-ray studies, and may lead to new developments in x-ray optics.
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Affiliation(s)
- S-L Chang
- Department of Physics, National Tsing Hua University (NTHU), Hsinchu, Taiwan 300, Republic of China.
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Abstract
PURPOSE To evaluate the most useful findings to look for in diagnosing acute appendicitis on contrast-enhanced helical CT. MATERIAL AND METHODS Appendiceal helical CT scans with intravenous contrast administration (abdomen, 7-mm collimation; abdominopelvic junction, 5-mm collimation) of 71 patients with surgically proven acute appendicitis and 167 patients with alternative diagnoses were reviewed retrospectively. Three radiologists analyzed the following parameters: enlarged appendix (>6 mm in diameter), appendiceal wall thickening, appendiceal wall enhancement, no identification of the appendix, appendicolith(s), appendiceal intraluminal air, intramural air, extraluminal air, periappendiceal fat stranding, extraluminal fluid, phlegmon, abscess, lymphadenopathy, segmental terminal ileal wall thickening, focal cecal apical thickening, focal colonic wall thickening, and segmental colonic wall thickening. The features that best distinguished appendicitis from alternative diagnoses were selected with stepwise logistic regression analysis. RESULTS Nine CT findings distinguished acute appendicitis from alternative diagnoses (P < 0.05): enlarged appendix (R = 0.739), appendiceal wall thickening (R = 0.525), periappendiceal fat stranding (R = 0.414), appendiceal wall enhancement (R = 0.404), focal cecal apical thickening (R = 0.171), appendicolith(s) (R = 0.157), extraluminal air (R = 0.050), intramural air (R = 0.043), and phlegmon (R = 0.030). Enlarged appendix (sensitivity, 93%; specificity, 92%), appendiceal wall thickening (sensitivity, 66%; specificity, 96%), periappendiceal fat stranding (sensitivity, 87%; specificity, 74%), and appendiceal wall enhancement (sensitivity, 75%; specificity, 85%) showed the statistically most significant association with acute appendicitis. CONCLUSION On 5-mm-section contrast-enhanced helical CT examinations, enlarged appendix, appendiceal wall thickening, periappendiceal fat stranding, and appendiceal wall enhancement were the most useful findings for diagnosing acute appendicitis.
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Affiliation(s)
- D Choi
- Department of Radiology, Kangbuk Samsung Hospital, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
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Abstract
PURPOSE To evaluate the most useful findings to look for in diagnosing acute appendicitis on contrast-enhanced helical CT. MATERIAL AND METHODS Appendiceal helical CT scans with intravenous contrast administration (abdomen, 7-mm collimation; abdominopelvic junction, 5-mm collimation) of 71 patients with surgically proven acute appendicitis and 167 patients with alternative diagnoses were reviewed retrospectively. Three radiologists analyzed the following parameters: enlarged appendix (>6 mm in diameter), appendiceal wall thickening, appendiceal wall enhancement, no identification of the appendix, appendicolith(s), appendiceal intraluminal air, intramural air, extraluminal air, periappendiceal fat stranding, extraluminal fluid, phlegmon, abscess, lymphadenopathy, segmental terminal ileal wall thickening, focal cecal apical thickening, focal colonic wall thickening, and segmental colonic wall thickening. The features that best distinguished appendicitis from alternative diagnoses were selected with stepwise logistic regression analysis. RESULTS Nine CT findings distinguished acute appendicitis from alternative diagnoses (P < 0.05): enlarged appendix (R = 0.739), appendiceal wall thickening (R = 0.525), periappendiceal fat stranding (R = 0.414), appendiceal wall enhancement (R = 0.404), focal cecal apical thickening (R = 0.171), appendicolith(s) (R = 0.157), extraluminal air (R = 0.050), intramural air (R = 0.043), and phlegmon (R = 0.030). Enlarged appendix (sensitivity, 93%; specificity, 92%), appendiceal wall thickening (sensitivity, 66%; specificity, 96%), periappendiceal fat stranding (sensitivity, 87%; specificity, 74%), and appendiceal wall enhancement (sensitivity, 75%; specificity, 85%) showed the statistically most significant association with acute appendicitis. CONCLUSION On 5-mm-section contrast-enhanced helical CT examinations, enlarged appendix, appendiceal wall thickening, periappendiceal fat stranding, and appendiceal wall enhancement were the most useful findings for diagnosing acute appendicitis.
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Affiliation(s)
- D Choi
- Department of Radiology, Kangbuk Samsung Hospital, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
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Lee YR, Kim Y, Koh BH, Cho OK, Rhim H, Park DW, Park HK. Solid and papillary epithelial neoplasm of the pancreas with peritoneal metastasis and its recurrence: a case report. Abdom Imaging 2003; 28:96-8. [PMID: 12483395 DOI: 10.1007/s00261-001-0158-9] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Solid and papillary epithelial neoplasm of the pancreas is a low-grade malignant tumor, generally occurring as a slowly growing upper abdominal mass in a young female. With complete excision, the prognosis is good. Malignant behavior with metastasis does occur, but the incidence is very low. We report a young woman who had this neoplasm in the pancreatic tail with peritoneal seeding and its recurrence.
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Affiliation(s)
- Y R Lee
- Department of Diagnostic Radiology, College of Medicine, Hanyang University, Kuri Hospital, 249-1, Kyomoon-Dong, Kuri City, Kyunggi-Do, 471-701, South Korea
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Choi D, Yoo CH, Park H, Lee YR, Kook SH, Chung EC. Proximal gastrectomy and jejunal pouch interposition: radiographic evaluation of postoperative findings. Abdom Imaging 2003; 28:4-7. [PMID: 12483375 DOI: 10.1007/s00261-002-0022-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
BACKGROUND We assessed the postoperative findings of proximal gastrectomy and jejunal pouch interposition with contrast radiography. METHODS Eleven patients with proximal gastrectomy and jejunal pouch interposition for proximal gastric carcinoma underwent contrast radiography. We evaluated the radiographic findings of the remnant stomach and interposed jejunal pouch. RESULTS The interposed jejunal pouch showed good expansion, and the motility of the remnant gastric antrum was normal in all patients. One patient had significant lumenal narrowing of the esophageal pouch anastomotic site. Leak at the anastomotic site was not found. Reflux into the esophagus from the pouch was observed in two patients. Gastric emptying time was considerably delayed in two patients. CONCLUSION Follow-up upper gastrointestinal series of the proximal gastrectomy and jejunal pouch interposition showed different postoperative findings. Awareness of the normal and abnormal findings is essential in the accurate postoperative evaluation of these patients.
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Affiliation(s)
- D Choi
- Department of Radiology, Kangbuk Samsung Hospital, Samsung Medical Center, Sungkyunkwan University School of Medicine, 108, Pyung-Dong, Jongro-Ku, Seoul 110-746, Korea
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Lee YR, Giang HM, Liu B. A novel plant kinesin-related protein specifically associates with the phragmoplast organelles. Plant Cell 2001; 13:2427-39. [PMID: 11701879 PMCID: PMC139462 DOI: 10.1105/tpc.010225] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2001] [Accepted: 08/29/2001] [Indexed: 05/17/2023]
Abstract
In higher plants, the formation of the cell plate during cytokinesis requires coordinated microtubule (MT) reorganization and vesicle transport in the phragmoplast. MT-based kinesin motors are important players in both processes. To understand the mechanisms underlying plant cytokinesis, we have identified AtPAKRP2 (for Arabidopsis thaliana phragmoplast-associated kinesin-related protein 2). AtPAKRP2 is an ungrouped N-terminal motor kinesin. It first appeared in a punctate pattern among interzonal MTs during late anaphase. When the phragmoplast MT array appeared in a mirror pair, AtPAKRP2 became more concentrated near the division site, and additional signal could be detected elsewhere in the phragmoplast. In contrast, the previously identified AtPAKRP1 protein is associated specifically with bundles of MTs in the phragmoplast at or near their plus ends. Localization of the tobacco homolog(s) of AtPAKRP2 was altered by treatment of brefeldin A in BY-2 cells. We discuss the possibility that AtPAKRP1 plays a role in establishing and/or maintaining the phragmoplast MT array, and AtPAKRP2 may contribute to the transport of Golgi-derived vesicles in the phragmoplast.
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Affiliation(s)
- Y R Lee
- Section of Plant Biology, University of California, Davis, California 95616-8537, USA
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Abstract
In higher plants, the formation of the cell plate during cytokinesis requires coordinated microtubule (MT) reorganization and vesicle transport in the phragmoplast. MT-based kinesin motors are important players in both processes. To understand the mechanisms underlying plant cytokinesis, we have identified AtPAKRP2 (for Arabidopsis thaliana phragmoplast-associated kinesin-related protein 2). AtPAKRP2 is an ungrouped N-terminal motor kinesin. It first appeared in a punctate pattern among interzonal MTs during late anaphase. When the phragmoplast MT array appeared in a mirror pair, AtPAKRP2 became more concentrated near the division site, and additional signal could be detected elsewhere in the phragmoplast. In contrast, the previously identified AtPAKRP1 protein is associated specifically with bundles of MTs in the phragmoplast at or near their plus ends. Localization of the tobacco homolog(s) of AtPAKRP2 was altered by treatment of brefeldin A in BY-2 cells. We discuss the possibility that AtPAKRP1 plays a role in establishing and/or maintaining the phragmoplast MT array, and AtPAKRP2 may contribute to the transport of Golgi-derived vesicles in the phragmoplast.
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Affiliation(s)
- Y R Lee
- Section of Plant Biology, University of California, Davis, California 95616-8537, USA
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Wang PH, Li YF, Juang CM, Lee YR, Chao HT, Tsai YC, Yuan CC. Altered mRNA expression of sialyltransferase in squamous cell carcinomas of the cervix. Gynecol Oncol 2001; 83:121-7. [PMID: 11585423 DOI: 10.1006/gyno.2001.6358] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
OBJECTIVE Increased sialylation has been reported in various kinds of cancers, but to date, sialylation of cervical carcinoma has never been evaluated. This study of the changes in messenger ribonucleic acid (mRNA) expression of the four sialyltransferases (ST3Gal I, ST3Gal III, ST3Gal IV, and ST6Gal I) in a normal cervix and that with FIGO stage IB1 squamous cell carcinoma was undertaken to assess the extent of sialylation associated with establishment of the carcinoma. METHODS Alterations in ST mRNA expression in FIGO IB1 cervical cancer (n = 30) and normal cervixes (n = 30) were examined by semiquantitative reverse transcription-polymerase chain reaction (RT-PCR). RESULTS ST6Gal I expression was enhanced in squamous cell carcinoma of the cervix (P = 0.026, Mann-Whitney U test), but mRNA expression from the other three STs (ST3Gal I, ST3Gal III, and ST3Gal IV) was significantly down-expressed in squamous cell carcinoma of the cervix compared to the normal cervix (P = 0.003, P < 0.001, and P = 0.001, respectively). High ST6Gal I expression was associated with more invasive properties of cervical cancer, such as deep stromal invasion, lymph or vascular space involvement, and poor differentiation (P = 0.010, P < 0.001, P < 0.001, respectively). CONCLUSIONS A combination of enhanced ST6Gal I mRNA expression and decreased mRNA expression from ST3Gal I, ST3Gal III, and ST3Gal IV might be important in cervical cancer. Future studies will investigate whether RT-PCR detection of the expression of these enzymes can be helpful for prognostic purposes.
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Affiliation(s)
- P H Wang
- Department of Obstetrics and Gynecology, Veterans General Hospital-Taipei, Taipei, Taiwan.
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30
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Kang BS, Chung EY, Yun YP, Lee MK, Lee YR, Lee KS, Min KR, Kim Y. Inhibitory effects of anti-inflammatory drugs on interleukin-6 bioactivity. Biol Pharm Bull 2001; 24:701-3. [PMID: 11411563 DOI: 10.1248/bpb.24.701] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Interleukin-6 (IL-6) is known as a proinflammatory cytokine involved in immune response, inflammation, and hematopoiesis. Inhibitory effects of anti-inflammatory drugs on IL-6 bioactivity using IL-6-dependent hybridoma have been evaluated. Three out of 16 nonsteroidal anti-inflammatory drugs (NSAIDs) showed IC50 values of less than 100 microM, which were in the order of oxyphenylbutazone hydrate (IC50=7.5 microM)>meclofenamic acid sodium salt (31.9 microM)>sulindac (74.9 microM). Steroidal anti-inflammatory drugs (SAIDs) exhibited significant inhibitory effects at 100 microM on the IL-6 bioactivity, and their inhibitory potencies were in the order of budesonide (IC50=2.2 microM)>hydrocortisone 21-hemisuccinate (6.7 microM), prednisolone (7.5 microM), betamethasone (10.9 microM)>dexamethasone (18.9 microM) and triamcinolone acetonide (24.1 microM). The results would provide an additional mechanism by which anti-inflammatory drugs display their anti-inflammatory and immunosuppressive effects at higher concentrations.
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Affiliation(s)
- B S Kang
- College of Pharmacy, Chungbuk National University, Cheongju, Korea
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31
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Stetsko YP, Juretschke HJ, Huang YS, Lee YR, Lin TC, Chang SL. Polarization-resolved output analysis of X-ray multiple-wave interaction. Acta Crystallogr A 2001; 57:359-67. [PMID: 11326121 DOI: 10.1107/s0108767301001325] [Citation(s) in RCA: 26] [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] [Received: 11/21/2000] [Accepted: 01/17/2001] [Indexed: 11/10/2022] Open
Abstract
The polarization suppression of the interfering components in X-ray multiple-wave interaction is observed for the first time by using a polarization analyzer with an arbitrary inclination of the diffraction plane with respect to that of the investigated crystal. The condition for total suppression of the multiple-wave interaction outside the investigated crystals by a polarization analyzer is derived theoretically from the modified Born approximation. By means of the partial suppression of the strong interfering component, the increase in the visibility of multiple-wave interference is experimentally and theoretically demonstrated. The proposed experimental polarization-resolved technique provides an operational way to enhance the visibility of X-ray multiple-wave interaction outside the investigated crystals for direct phase determination.
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Affiliation(s)
- Y P Stetsko
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.
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32
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Abstract
Several o-phenol-containing alkoxyvinylsilanes were prepared and their photochemistry was investigated. These materials were prepared via hydrosilylation of the corresponding o-acetoxy arylacetylenes. Two major classes of photochemical processes were identified in these reactants: trans-->cis isomerization, leading to an intramolecular nucleophilic substitution process at silicon, and 1,5-silyl shift, leading to an unsymmetrical dialkoxysilane. The major outcome of this work is a novel class of photochemically removable protecting groups. Two alkyl substitutions on silicon, the dimethyl and diisopropyl, were examined. The latter is more stable and is preferred for protecting groups that must tolerate multiple steps or reagents. Protection of alcohols is generally performed starting with the arylethynyl acetate, which can be subjected to hydrosilylation, alcohol substitution, and acetate deprotection without isolation of intermediates. Two groups were studied in detail, the phenol and 2-naphthol vinyl silane derivatives. A variety of primary and secondary alcohols were protected with these reagents. These groups can be deprotected cleanly and in high yield by irradiation from 250 to 350 nm.
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Affiliation(s)
- M C Pirrung
- Department of Chemistry, Levine Science Research Center, Box 90317, Duke University, Durham, North Carolina 27708-0317, USA
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Lee YR, Park JH, Jeon R, Jeong LS, Chun MW, Kim HD. Design and synthesis of novel fluorocyclopropanoid nucleosides. Nucleosides Nucleotides Nucleic Acids 2001; 20:677-9. [PMID: 11563090 DOI: 10.1081/ncn-100002349] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Novel fluorocyclopropanoid nucleosides were designed, synthesized and evaluated their antiviral activities against poliovirus, HSV, HIV, and HBV.
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Affiliation(s)
- Y R Lee
- College of Pharmacy, Sookmyung Women's University, Seoul 140-742, Korea
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Lee YR, Yamazaki M, Mitsui S, Tsuboi R, Ogawa H. Hepatocyte growth factor (HGF) activator expressed in hair follicles is involved in in vitro HGF-dependent hair follicle elongation. J Dermatol Sci 2001; 25:156-63. [PMID: 11164712 DOI: 10.1016/s0923-1811(00)00124-9] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [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: 10/18/2022]
Abstract
Hepatocyte growth factor (HGF), a paracrine factor secreted by follicular papilla cells, acts on neighboring follicular epithelial cells to promote follicular growth, while HGF activator is a serine proteinase, which converts inactive single-chain HGF to the active heterodimeric form. In this study, using 3' rapid amplification of cDNA end/nested polymerase chain reaction (3' RACE/nested PCR) and immunoblotting, we confirmed the expression of HGF activator in both cultured human follicular papilla cells and outer root sheath cells. HGF activator mRNA was expressed in all of the isolated 15 anagen hair follicles taken from the scalps of seven individuals. In an organ culture system, single-chain HGF stimulated hair follicle elongation, which was partially inhibited by aprotinin, a serine proteinase inhibitor (P<0.01). These results suggest that single-chain HGF secreted from follicular papilla cells is converted to an active heterodimeric form by intrinsic HGF activator and that the resultant active form of HGF stimulates hair growth.
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Affiliation(s)
- Y R Lee
- Department of Dermatology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113, Japan
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35
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Shad JA, Lee YR. Pancreatitis due to Ascaris lumbricoides: second occurrence after 2 years. South Med J 2001; 94:78-80. [PMID: 11213951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Pancreatitis is a common disease in the United States, with the most likely etiologies being biliary tract disease and alcohol use. Infections with parasites such as Ascaris lumbricoides comprise a small percentage of pancreatitis cases in the United States, but they are a common etiology in developing countries. In the United States, the incidence of pancreatic and biliary ascariasis has been increasing because of the migration of people from endemic countries, as well as increased travel by Americans to such countries. Patients treated for this roundworm can have reinvasion for the same reasons. We report the case of a patient with two episodes of pancreatitis due to A. lumbricoides 2 years apart.
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Affiliation(s)
- J A Shad
- Department of Internal Medicine, Naval Medical Center, San Diego, Calif. 92134-1005, USA
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36
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Abstract
Endocrine therapy is effective in approximately one-third of all breast cancers and up to 80% of tumors that express both estrogen and progesterone receptors. Despite the low toxicity, good overall response rates, and additional benefits associated with its partial agonist activity, most Tamoxifen-responsive breast cancers acquire resistance. The development of new antiestrogens, both steroidal and non-steroidal, provides the opportunity for the development of non-cross-resistant therapies and the identification of additional mechanisms of action and resistance. Drug-specific pharmacologic mechanisms may confer a resistance phenotype, reflecting the complexities of both tumor biology/pharmacology and the molecular endocrinology of steroid hormone action. However, since all antiestrogens will be effective only in cells that express estrogen receptors (ER), many mechanisms will likely be directly related to ER expression and signaling. For example, loss of ER expression/function is likely to confer a cross-resistance phenotype across all structural classes of antiestrogens. Altered expression of ERalpha and ERbeta, and/or signaling from transcription complexes driven by these receptors, may produce drug-specific resistance phenotypes. We have begun to study the possible changes in gene expression that may occur as cells acquire resistance to steroidal and non-steroidal antiestrogens. Our preliminary studies implicate the altered expression of several estrogen-regulated genes. However, resistance to antiestrogens is likely to be a multigene phenomenon, involving a network of interrelated signaling pathways. The way in which this network is adapted by cells may vary among tumors, consistent with the existence of a highly plastic and adaptable genotype within breast cancer cells.
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Affiliation(s)
- R Clarke
- Department of Oncology and Lombardi Cancer Center, The Research Building W405A, Georgetown University School of Medicine, 3970 Reservoir Road NW, Washington, DC 20007, USA.
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Abstract
The phragmoplast executes cytokinesis in higher plants. The major components of the phragmoplast are microtubules, which are arranged in two mirror-image arrays perpendicular to the division plane [1]. The plus ends of these microtubules are located near the site of the future cell plate. Golgi-derived vesicles are transported along microtubules towards the plus ends to deliver materials bound for the cell plate [2] [3]. During cell division, rapid microtubule reorganization in the phragmoplast requires the orchestrated activities of microtubule motor proteins such as kinesins. We isolated an Arabidopsis cDNA clone of a gene encoding an amino-terminal motor kinesin, AtPAKRP1, and have determined the partial sequence of its rice homolog. Immunofluorescence experiments with two sets of specific antibodies revealed consistent localization of AtPAKRP1 and its homolog in Arabidopsis and rice cells undergoing anaphase, telophase and cytokinesis. AtPAKRP1 started to accumulate along microtubules towards the spindle midzone during late anaphase. Once the phragmoplast microtubule array was established, AtPAKRP1 conspicuously localized to microtubules near the future cell plate. Our results provide evidence that AtPAKRP1 is a hitherto unknown motor that may take part in the establishment and/or maintenance of the phragmoplast microtubule array.
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Affiliation(s)
- Y R Lee
- Section of Plant Biology, University of California Davis, 95616, USA
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Lee YR, Suk JY, Kim BS. One-pot construction of medium- and large-sized ring substituted furans. Efficient conversion to dibenzofurans, coumestans, and 4-pyrones. Org Lett 2000; 2:1387-9. [PMID: 10814454 DOI: 10.1021/ol0056933] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
New efficient synthesis of medium- and large-sized ring substituted furans is achieved by 1,3-dicarbonyl compounds with vinyl sulfides in the presence of Ag(2)CO(3)/Celite (Fétizon's reagent) in a one-pot procedure. The synthesized furans can be further converted to biologically interesting compounds such as dibenzofurans, coumestans, benzofuroquinolinone, and 4-pyrone.
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Affiliation(s)
- Y R Lee
- School of Chemical Engineering and Technology, College of Engineering, Yeungnam University, Kyongsan 712-749, Korea.
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39
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Lee SH, Ha HK, Byun JY, Kim AY, Cho KS, Lee YR, Park HW, Kim PN, Lee MG, Auh YH. Radiological features of leiomyomatous tumors of the colon and rectum. J Comput Assist Tomogr 2000; 24:407-12. [PMID: 10864076 DOI: 10.1097/00004728-200005000-00009] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE The purpose of this study was to evaluate the radiological features of 12 pathologically proven cases of colorectal leiomyomatous tumors. METHOD A retrospective analysis of radiologic findings was performed in 12 patients with pathologically proven colorectal leiomyomatous tumors (2 leiomyomas and 10 leiomyosarcomas). Available radiologic studies included abdominal CT scans in 11 patients, double contrast barium studies in 4, and pelvic MRI in 1. On imaging, we evaluated the size, tumor margin (smooth or lobulated), morphologic appearance, growth patterns (endocolic, exocolic, or combined), contrast enhancement patterns, presence or absence of calcification within the tumors, and metastasis. RESULTS The involved tumor sites were the colon in 2 patients and the rectum in 10. The mean tumor size was 7.9 cm (range 2-15 cm): It was 3.5 cm in leiomyomas and 8.8 cm in leiomyosarcomas. On imaging studies, the tumor margin was smooth in three patients and lobulated in nine, with endocolic growth in one, exocolic in four, and combined in the remaining seven. Eight of the 12 tumors showed varying degrees of internal necrosis with heterogeneous contrast enhancement. Dystrophic calcification was noted in five patients. Metastasis was seen in the liver in three patients at the time of initial diagnosis, and lymphadenopathy was noted in two patients (paraaortic space in one and perirectal space in two). CONCLUSION Although rare, the diagnosis of leiomyomatous tumor may be suggested especially when the tumor occurring in the colorectum shows exocolic growth or calcification with varying degree of internal necrosis.
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Affiliation(s)
- S H Lee
- Department of Diagnostic Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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40
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Shad JA, Lee YR. Separation of an overtube from the bite block during treatment of food impaction. J Clin Gastroenterol 1999; 29:345-6. [PMID: 10599640 DOI: 10.1097/00004836-199912000-00011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
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41
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Yamazaki M, Tsuboi R, Lee YR, Ishidoh K, Mitsui S, Ogawa H. Hair cycle-dependent expression of hepatocyte growth factor (HGF) activator, other proteinases, and proteinase inhibitors correlates with the expression of HGF in rat hair follicles. J Investig Dermatol Symp Proc 1999; 4:312-5. [PMID: 10674388 DOI: 10.1038/sj.jidsp.5640236] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We previously reported that hepatocyte growth factor (HGF) had a stimulatory effect on hair growth in vivo and in vitro. The secreted inactive form of HGF is processed into an active form by serine proteinases such as HGF activator and urokinase. The mRNA expressions of various proteinases and their inhibitors in relation to HGF activation in hair growth were examined using animals with a synchronous hair cycle. Total RNA were extracted from the anterior dorsal skin of rats in different hair cycle stages, and mRNA expressions of the specific genes were compared using semiquantitative reverse transcription polymerase chain reaction. The mRNA of HGF, HGF activator, urokinase, plasminogen activator inhibitor (PAI)-1, nexin-1, matrix metalloproteinase (MMP)-2, and tissue inhibitor of metalloproteinase (TIMP)-1 were expressed strongly in anagen tissue and slightly in telogen tissue. Moreover, topical application of 1% minoxidil sulfate to the anterior dorsal skin of rats in telogen stimulated hair growth and increased the mRNA expressions of HGF and MMP-2. These findings suggest that some proteinases and their inhibitors, strongly expressed in anagen, may act as hair growth regulatory molecules, and may also be involved in processing the latent form of HGF.
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Affiliation(s)
- M Yamazaki
- Department of Dermatology, Juntendo University School of Medicine, Tokyo, Japan
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42
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Chen CH, Lee YR, Chung MY, Wei FC, Koong FJ, Shaw CK, Yeh JI, Hsiao KJ. Systematic mutation analysis of the catechol O-methyltransferase gene as a candidate gene for schizophrenia. Am J Psychiatry 1999; 156:1273-5. [PMID: 10450274 DOI: 10.1176/ajp.156.8.1273] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [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: 11/30/2022]
Abstract
OBJECTIVE Catechol O-methyltransferase (COMT) is involved in the degradation of catecholamine neurotransmitters. Recent linkage studies of schizophrenia and molecular studies of velocardiofacial syndrome suggest that the COMT gene might be a candidate gene for schizophrenia. METHOD The authors systematically searched for mutations and microdeletion of the COMT gene in 177 Chinese schizophrenic patients from Taiwan; 99 comparison subjects were also studied. RESULTS Five molecular variants were identified: c.186C > T at exon 3, c.408C > G at exon 4, c.472G > A at exon 4, c.597G > A at exon 5, and c.821-827insC at the 3' untranslated region. However, no differences in the genotype and haplotype frequencies of these molecular variants between the schizophrenic and comparison subjects were detected. Furthermore, no microdeletion was identified among the patients. CONCLUSIONS These data suggest that the COMT gene does not play a major role in the pathogenesis of schizophrenia, and the genotypic overlap between schizophrenia and velocardiofacial syndrome was rare in this cohort.
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Affiliation(s)
- C H Chen
- Department of Psychiatry, Tzu-Chi General Hospital, Hualien City, Taiwan.
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Abstract
PURPOSE We compared the abilities of power and conventional color Doppler sonography to depict the vascularity of solid breast lesions and evaluated the usefulness of power Doppler sonography in differentiating between benign and malignant breast lesions. METHODS One hundred two solid breast lesions (59 benign and 43 malignant lesions) were studied with power and color Doppler sonography. Power and color Doppler sonograms were retrospectively compared for the depiction of blood flow signals. Power Doppler images were also reviewed for the amount of Doppler signals, pattern of vascularity, and morphology of vessels. The sensitivity, specificity, and accuracy of the 2 techniques were calculated. RESULTS Compared with color Doppler sonography, power Doppler sonography depicted flow superiorly in 61 cases (60%) and equally in 41 cases (40%). On power Doppler sonography, the incidence of marked blood flow in malignant lesions (65%) was higher than that in benign lesions (39%). The pattern of vascularity was predominantly central (86%) and/or penetrating (65%) more often in malignant lesions than in benign lesions (51% and 34%, respectively). Branching (56%) and disordered vessels (42%) were seen more often in malignant lesions than in benign lesions (22% and 8%, respectively). The sensitivity, specificity, and accuracy in diagnosing malignancy were 64%, 76%, and 71%, respectively, for power Doppler sonography and 77%, 76%, and 76% for color Doppler sonography. CONCLUSIONS Power Doppler sonography was more sensitive than color Doppler sonography in the detection of flow in solid breast lesions. Although power Doppler sonography was not more effective in diagnosing malignant lesions, central and penetrating vascularity patterns and branching and disordered vessels seem to be helpful findings in predicting malignancy.
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Affiliation(s)
- S H Kook
- Department of Radiology, Kangbuk Samsung Hospital, School of Medicine, Sungkyunkwan University, Seoul, South Korea
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Abstract
Heterotrimeric GTP-binding proteins, composed of alpha, beta, and gamma subunits, are involved in signal transduction pathways in animal and plant systems. In plants, physiological analyses implicate heterotrimeric G-proteins in ion channel regulation, light signaling, and hormone and pathogen responses. However, only one class of plant G alpha genes has been identified to date. We have cloned a novel gene, 'Arabidopsis thaliana extra-large GTP-binding protein' (AtXLG1). AtXLG1 appears to be a member of a small gene family and is transcribed in all tissues assayed: roots, leaves, stems, flowers, and fruits. The conceptually translated protein from AtXLG1 is 99 kDa, twice as large as typical G alpha proteins. The carboxy-terminal half of the AtXLG1 protein has significant homology to animal and plant G alpha proteins. This region includes a GTP-binding domain, a predicted helical domain, and an aspartate/glutamate-rich loop, which are characteristics of G alpha's. Despite the absence of some of the amino acids implicated in GTP binding and hydrolysis by crystallographic and mutational analyses of mammalian G alpha's, recombinant AtXLG1 binds GTP with specificity. The amino-terminal region of AtXLG1 contains domains homologous to the bacterial TonB-box, which is involved in energy transduction between the inner and outer bacterial membranes, and to zinc-finger proteins. Given the unique structure of AtXLG1, it will be of interest to uncover its physiological functions.
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Affiliation(s)
- Y R Lee
- Department of Biology, Pennsylvania State University, University Park 16802, USA
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Abstract
This study compared cultural influences on caregiver burdens of Korean adult children and American adult children caring for parents with dementia, and identified culturally specific values, norms, and customs associated with low or high burden. The findings suggested that the low burden of the Korean caregivers was associated with extended family support and high filial responsibility while that of the American caregivers was related to the use of formal services and high gratification from caregiving. Obversely, the high burden of the Koreans was seen to be associated with limited formal services outside the family and low gratification from caregiving for in-laws while that of the Americans was suggested to be due to limited extended family support and low filial responsibility. Needs for culturally-appropriate interventions are discussed.
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Affiliation(s)
- Y R Lee
- Seoul Women's University, Korea
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46
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Li J, Lee YR, Assmann SM. Guard cells possess a calcium-dependent protein kinase that phosphorylates the KAT1 potassium channel. Plant Physiol 1998; 116:785-95. [PMID: 9489023 PMCID: PMC35138 DOI: 10.1104/pp.116.2.785] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/1997] [Accepted: 11/03/1997] [Indexed: 05/18/2023]
Abstract
Increasing evidence suggests that changes in cytosolic Ca2+ levels and phosphorylation play important roles in the regulation of stomatal aperture and as ion transporters of guard cells. However, protein kinases responsible for Ca2+ signaling in guard cells remain to be identified. Using biochemical approaches, we have identified a Ca(2+)-dependent protein kinase with a calmodulin-like domain (CDPK) in guard cell protoplasts of Vicia faba. Both autophosphorylation and catalytic activity of CDPK are Ca2+ dependent. CDPK exhibits a Ca(2+)-induced electrophoretic mobility shift and its Ca(2+)-dependent catalytic activity can be inhibited by the calmodulin antagonists trifluoperazine and N-(6-aminohexyl)-5-chloro-1-naphthalenesulfonamide. Antibodies to soybean CDPK alpha cross-react with CDPK. Micromolar Ca2+ concentrations stimulate phosphorylation of several proteins from guard cells; cyclosporin A, a specific inhibitor of the Ca(2+)-dependent protein phosphatase calcineurin enhances the Ca(2+)-dependent phosphorylation of several soluble proteins. CDPK from guard cells phosphorylates the K+ channel KAT1 protein in a Ca(2+)-dependent manner. These results suggest that CDPK may be an important component of Ca2+ signaling in guard cells.
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Affiliation(s)
- J Li
- Department of Biology, Pennsylvania State University, University Park 16802, USA
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47
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Abstract
The relative and absolute stereochemistries of (+)-purpurin (3), a flavanone natural product from Tephrosia, were determined to be 2S,7aR,10S,10aS by synthesis from semiglabrin in conjunction with X-ray crystallographic analysis.
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Affiliation(s)
- MC Pirrung
- Department of Chemistry, P. M. Gross Chemical Laboratory, Duke University, Durham, North Carolina 27708-0346
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48
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Chen CH, Lee YR, Wei FC, Koong FJ, Hwu HG, Hsiao KJ. Association study of NlaIII and MspI genetic polymorphisms of catechol-O-methyltransferase gene and susceptibility to schizophrenia. Biol Psychiatry 1997; 41:985-7. [PMID: 9110105 DOI: 10.1016/s0006-3223(97)00045-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- C H Chen
- Division of Neuropsychiatry, School of Medicine, National Yang Ming University, Taipei, Taiwan
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49
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Chen CH, Lee YR, Wei FC, Koong FJ, Hwu HG, Hsiao KJ. Lack of allelic association between 102T/C polymorphism of serotonin receptor type 2A gene and schizophrenia in Chinese. Psychiatr Genet 1997; 7:35-8. [PMID: 9264136 DOI: 10.1097/00041444-199700710-00005] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [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: 02/05/2023]
Abstract
Recent studies have reported an association between a 102T/C polymorphism of serotonin receptor type 2A gene (5-HT2A) and schizophrenia. In addition, an association was detected between a 102T/C polymorphism of the 5-HT2A receptor gene and drug response to clozapine in the treatment of schizophrenic patients. These studies suggest an important role of the 5-HT2A gene in schizophrenia. To study the possible involvement of the 5-HT2A gene in the pathogenesis of schizophrenia, a case-control association study was carried out in a Chinese population from Taiwan. No significant differences of genotype distributions, allele frequencies and homozygosity were detected between schizophrenic patients (n = 177) and nonpsychiatric controls (n = 98). When subjects were divided into subgroups according to sex, still no differences of allele frequencies or genotype distributions were noted between patients and controls. Our data do not support an allelic association between the 102T/C polymorphism of the 5-HT2A receptor gene and schizophrenia in Chinese population.
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Affiliation(s)
- C H Chen
- Division of Neuropsychiatry, School of Medicine, National Yang-Ming University, Taipei, Taiwan.
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50
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Abstract
The study examined differences in motivations for parent care of Korean caregivers and Caucasian American caregivers of elderly parents with dementia. A number of American caregivers, mostly daughters of the demented parents, had affectionate relationships with their parents, but they expressed a relatively low degree of filial responsibility. In contrast, among Korean caregivers, the care of demented parents was predominantly the responsibility of daughters-in-law who were less likely to have affectionate relationships with the parents-in-law. However, Korean caregivers expressed a significantly higher level of filial responsibility than the American caregivers. Some cultural differences between the two ethnic groups associated with parent care were discussed.
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Affiliation(s)
- Y R Lee
- Seoul Women's University, Korea
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