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Wang TC, Mai BK, Zhang Z, Bo Z, Li J, Liu P, Yang Y. Stereoselective amino acid synthesis by photobiocatalytic oxidative coupling. Nature 2024; 629:98-104. [PMID: 38693411 DOI: 10.1038/s41586-024-07284-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Accepted: 03/07/2024] [Indexed: 05/03/2024]
Abstract
Photobiocatalysis-where light is used to expand the reactivity of an enzyme-has recently emerged as a powerful strategy to develop chemistries that are new to nature. These systems have shown potential in asymmetric radical reactions that have long eluded small-molecule catalysts1. So far, unnatural photobiocatalytic reactions are limited to overall reductive and redox-neutral processes2-9. Here we report photobiocatalytic asymmetric sp3-sp3 oxidative cross-coupling between organoboron reagents and amino acids. This reaction requires the cooperative use of engineered pyridoxal biocatalysts, photoredox catalysts and an oxidizing agent. We repurpose a family of pyridoxal-5'-phosphate-dependent enzymes, threonine aldolases10-12, for the α-C-H functionalization of glycine and α-branched amino acid substrates by a radical mechanism, giving rise to a range of α-tri- and tetrasubstituted non-canonical amino acids 13-15 possessing up to two contiguous stereocentres. Directed evolution of pyridoxal radical enzymes allowed primary and secondary radical precursors, including benzyl, allyl and alkylboron reagents, to be coupled in an enantio- and diastereocontrolled fashion. Cooperative photoredox-pyridoxal biocatalysis provides a platform for sp3-sp3 oxidative coupling16, permitting the stereoselective, intermolecular free-radical transformations that are unknown to chemistry or biology.
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Affiliation(s)
- Tian-Ci Wang
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, USA
| | - Binh Khanh Mai
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA
| | - Zheng Zhang
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, USA
| | - Zhiyu Bo
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, USA
| | - Jiedong Li
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, USA
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA.
| | - Yang Yang
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, USA.
- Biomolecular Science and Engineering (BMSE) Program, University of California Santa Barbara, Santa Barbara, CA, USA.
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Wang TC, Jia MH, Xu NT, Hu W, Jiang Z, Zhao B, Ni YP, Shao ZB. Facile fabrication of adenosine triphosphate/chitosan/polyethyleneimine coating for high flame-retardant lyocell fabrics with outstanding antibacteria. Int J Biol Macromol 2024; 260:129599. [PMID: 38246455 DOI: 10.1016/j.ijbiomac.2024.129599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 01/09/2024] [Accepted: 01/17/2024] [Indexed: 01/23/2024]
Abstract
Addressing highly flammable and easily breeding bacteria property via environmentally friendly approach was critical for the large-scale application of lyocell fibers. Herein, a bio-based coating constructed by layer-by-layer deposition of adenosine triphosphate (ATP), chitosan (CS), and polyethyleneimine (PEI) was successfully fabricated to obtain excellent fire-resistant and antimicrobial lyocell fabrics (LBL/Lyocell). The resulted fabrics with add-on of 11.5 wt% achieved the limiting oxygen index (LOI) of 32.0 %. Meanwhile, compared with the pure lyocell fabrics, the peak of heat release rate (PHRR), total heat release (THR), and fire growth rate (FIGRA) of LBL/Lyocell fabrics decreased by 75.2 %, 61.0 % and 69.8 % in cone calorimetric test (CCT), respectively. By characterizing the gaseous products and solid residues, the presence of the ATP/CS/PEI coating could not only quickly form the dense expanded carbon layer by itself, but also promote the conversion of cellulose into thermal-stability residues, thus reducing the release of combustible substances during combustion and protecting the lyocell fabrics. In addition, LBL/Lyocell showed excellent antimicrobial properties with 99.99 % antibacterial rates against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). This bio-based coating was a promising candidate for efficiently flame-retardant cellulose fibers with excellent antibacteria.
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Affiliation(s)
- Tian-Ci Wang
- Institute of Functional Textiles and Advanced Materials, National Engineering Research Center for Advanced Fire-Safety Materials D & A (Shandong), Qingdao Key Laboratory of Flame-Retardant Textile Materials, College of Textiles and Clothing, Qingdao University, Ningxia Road, 308, Qingdao 266071, China
| | - Meng-Han Jia
- Institute of Functional Textiles and Advanced Materials, National Engineering Research Center for Advanced Fire-Safety Materials D & A (Shandong), Qingdao Key Laboratory of Flame-Retardant Textile Materials, College of Textiles and Clothing, Qingdao University, Ningxia Road, 308, Qingdao 266071, China
| | - Nuo-Tong Xu
- Institute of Functional Textiles and Advanced Materials, National Engineering Research Center for Advanced Fire-Safety Materials D & A (Shandong), Qingdao Key Laboratory of Flame-Retardant Textile Materials, College of Textiles and Clothing, Qingdao University, Ningxia Road, 308, Qingdao 266071, China
| | - Wei Hu
- College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China
| | - Zhiming Jiang
- Institute of Functional Textiles and Advanced Materials, National Engineering Research Center for Advanced Fire-Safety Materials D & A (Shandong), Qingdao Key Laboratory of Flame-Retardant Textile Materials, College of Textiles and Clothing, Qingdao University, Ningxia Road, 308, Qingdao 266071, China
| | - Bin Zhao
- Institute of Functional Textiles and Advanced Materials, National Engineering Research Center for Advanced Fire-Safety Materials D & A (Shandong), Qingdao Key Laboratory of Flame-Retardant Textile Materials, College of Textiles and Clothing, Qingdao University, Ningxia Road, 308, Qingdao 266071, China
| | - Yan-Peng Ni
- Institute of Functional Textiles and Advanced Materials, National Engineering Research Center for Advanced Fire-Safety Materials D & A (Shandong), Qingdao Key Laboratory of Flame-Retardant Textile Materials, College of Textiles and Clothing, Qingdao University, Ningxia Road, 308, Qingdao 266071, China.
| | - Zhu-Bao Shao
- Institute of Functional Textiles and Advanced Materials, National Engineering Research Center for Advanced Fire-Safety Materials D & A (Shandong), Qingdao Key Laboratory of Flame-Retardant Textile Materials, College of Textiles and Clothing, Qingdao University, Ningxia Road, 308, Qingdao 266071, China.
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Wang TC, He XH, Hu W, Zhu L, Shao ZB. Facile construction of bio-based high fire-safety cellulose fabrics with well wearing performance. Int J Biol Macromol 2023; 253:127349. [PMID: 37838134 DOI: 10.1016/j.ijbiomac.2023.127349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 09/01/2023] [Accepted: 10/04/2023] [Indexed: 10/16/2023]
Abstract
The design of flame-retardant cellulose fabrics suffered from deterioration on wearing performance and environmental issue. Here, we developed facile construction of bio-based high fire-safety cellulose fabrics (lyocell) that exploited the bio-based flame-retardant coating (APD) by adenosine triphosphate (ATP) and dicyandiamide (DCD) via ionic reaction. The rich phosphorus/nitrogen elements of APD enabled the excellent fire safety of APD/Lyocell. Specifically, the APD/Lyocell2 had a higher limiting oxygen index (LOI) value of 29.3 %, a lower peak of heat release rate (PHRR, decreasing by 66.6 %), and a reduced total heat rate (THR, lowered by 56.5 %) with respect to pure lyocell fabrics. Interestingly, the APD/Lyocell2 exhibited well flame-retardant durability via passing the vertical burning test after 100 rubs. The satisfactory flame-retardant behaviors of APD/Lyocell derived from the excellent synergistic effect on the gaseous-solid phases, where APD could release more non-flammable gasses and generate phosphoric acid, polyphosphoric acid, etc. to accelerate itself and cellulose dehydration into char residues during combustion. More importantly, the wearing performance of APD/Lyocell fabrics, such as handle, air permeability and tensile strength, etc. almost remained after treatment. The ease of operation and use of bio-based coating made it a promising option to obtain the practical lyocell fabrics with flame-retardancy.
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Affiliation(s)
- Tian-Ci Wang
- Institute of Functional Textiles and Advanced Materials, National Engineering Research Center for Advanced Fire-Safety Materials D & A (Shandong), Qingdao Key Laboratory of Flame-Retardant Textile Materials, College of Textiles and Clothing, Qingdao University, Ningxia Road, 308, Qingdao 266071, China
| | - Xin-Hua He
- Institute of Functional Textiles and Advanced Materials, National Engineering Research Center for Advanced Fire-Safety Materials D & A (Shandong), Qingdao Key Laboratory of Flame-Retardant Textile Materials, College of Textiles and Clothing, Qingdao University, Ningxia Road, 308, Qingdao 266071, China
| | - Wei Hu
- College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, PR China
| | - Longxiang Zhu
- Institute of Functional Textiles and Advanced Materials, National Engineering Research Center for Advanced Fire-Safety Materials D & A (Shandong), Qingdao Key Laboratory of Flame-Retardant Textile Materials, College of Textiles and Clothing, Qingdao University, Ningxia Road, 308, Qingdao 266071, China.
| | - Zhu-Bao Shao
- Institute of Functional Textiles and Advanced Materials, National Engineering Research Center for Advanced Fire-Safety Materials D & A (Shandong), Qingdao Key Laboratory of Flame-Retardant Textile Materials, College of Textiles and Clothing, Qingdao University, Ningxia Road, 308, Qingdao 266071, China.
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Wang TC, Guo JL, Tian QP, Deng HP, Yin B, Xiao Z, Lu B. Application of Tranexamic Acid in Shoulder Arthroscopic Surgery: A Randomised Controlled Trial. Chin Med Sci J 2023; 38:273-278. [PMID: 38163740 DOI: 10.24920/004295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Objective To explore the optimal administration route of tranexamic acid (TXA) in shoulder arthroscopic surgery. Methods Patients undergoing arthroscopic rotator cuff repair were randomly divided into four groups: control group (without TXA treatment), intravenous group (TXA was intravenously administered 10 minutes before surgery), irrigation group (TXA was added to the irrigation fluid during subacromial decompression and acromioplasty), and intravenous plus irrigation group (TXA was applied both intravenously and via intra-articular irrigation). The primary outcome was visual clarity assessed with visual analog scale (VAS) score, and the secondary outcomes included irrigation fluid consumption and time to subacromial decompression and acromioplasty procedure. Results There were 134 patients enrolled in the study, including 33 in the control group, 35 in the intravenous group, 32 in the irrigation group, and 34 in the intravenous plus irrigation group. The median and interquartile range of VAS scores for the intravenous, irrigation, and intravenous plus irrigation groups were 2.70 (2.50, 2.86) (Z = -3.677, P = 0.002), 2.67 (2.50, 2.77) (Z = -3.058, P < 0.001), and 2.91 (2.75, 3.00) (Z = -6.634, P < 0.001), respectively, significantly higher than that of the control group [2.44 (2.37, 2.53)]. Moreover, the control group consumed more irrigation fluid than the intravenous group, irrigation group, and intravenous plus irrigation group (all P < 0.05). The intravenous plus irrigation group consumed less irrigation fluid than either the intravenous group or the irrigation group (both P < 0.001). There was no difference in subacromial decompression and acromioplasty operative time among the four groups. Conclusion TXA applied both topically and systematically can improve intraoperative visual clarity, and the combined application is more effective.
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Affiliation(s)
- Tian-Ci Wang
- Department of Orthopedic Trauma, Hebei Medical University Third Affiliated Hospital, Shijiazhuang 050051, China
| | - Jia-Liang Guo
- Department of Orthopedic Trauma, Hebei Medical University Third Affiliated Hospital, Shijiazhuang 050051, China
| | - Qiu-Ping Tian
- Medical Services Section, Hebei Medical University Third Affiliated Hospital, Shijiazhuang 050051, China
| | - He-Ping Deng
- Department of Ultrasonography, Hebei Medical University Third Affiliated Hospital, Shijiazhuang 050051, China
| | - Bing Yin
- Department of Orthopedic Trauma, Hebei Medical University Third Affiliated Hospital, Shijiazhuang 050051, China
| | - Zeng Xiao
- Graduate School of Hebei Medical University, Shijiazhuang 050011, China
| | - Bo Lu
- Department of Orthopedic Trauma, Hebei Medical University Third Affiliated Hospital, Shijiazhuang 050051, China
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Wang TC, Zhu L, Luo S, Nong ZS, Wang PS, Gong LZ. Correction to "Palladium-Catalyzed Enantioselective C(sp 3)-H/C(sp 3)-H Umpolung Coupling of N-Allylimine and α-Aryl Ketones". J Am Chem Soc 2022; 144:18710. [PMID: 36190824 DOI: 10.1021/jacs.2c08467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Tang K, Jiao LM, Qi YR, Wang TC, Li YL, Xu JL, Wang ZW, Yu B, Liu HM, Zhao W. Discovery of Novel Pyrazole-Based KDM5B Inhibitor TK- 129 and Its Protective Effects on Myocardial Remodeling and Fibrosis. J Med Chem 2022; 65:12979-13000. [DOI: 10.1021/acs.jmedchem.2c00797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kai Tang
- State Key Laboratory of Esophageal Cancer Prevention and Treatment; Key Laboratory of Advanced Pharmaceutical Technology, Ministry of Education of China; School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Le-Min Jiao
- State Key Laboratory of Esophageal Cancer Prevention and Treatment; Key Laboratory of Advanced Pharmaceutical Technology, Ministry of Education of China; School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Yu-Ruo Qi
- State Key Laboratory of Esophageal Cancer Prevention and Treatment; Key Laboratory of Advanced Pharmaceutical Technology, Ministry of Education of China; School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Tian-Ci Wang
- State Key Laboratory of Esophageal Cancer Prevention and Treatment; Key Laboratory of Advanced Pharmaceutical Technology, Ministry of Education of China; School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Ya-Lan Li
- State Key Laboratory of Esophageal Cancer Prevention and Treatment; Key Laboratory of Advanced Pharmaceutical Technology, Ministry of Education of China; School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Jia-Le Xu
- State Key Laboratory of Esophageal Cancer Prevention and Treatment; Key Laboratory of Advanced Pharmaceutical Technology, Ministry of Education of China; School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Zi-Wei Wang
- State Key Laboratory of Esophageal Cancer Prevention and Treatment; Key Laboratory of Advanced Pharmaceutical Technology, Ministry of Education of China; School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Bin Yu
- State Key Laboratory of Esophageal Cancer Prevention and Treatment; Key Laboratory of Advanced Pharmaceutical Technology, Ministry of Education of China; School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Hong-Min Liu
- State Key Laboratory of Esophageal Cancer Prevention and Treatment; Key Laboratory of Advanced Pharmaceutical Technology, Ministry of Education of China; School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Wen Zhao
- State Key Laboratory of Esophageal Cancer Prevention and Treatment; Key Laboratory of Advanced Pharmaceutical Technology, Ministry of Education of China; School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
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Li DM, Wu YX, Hu ZQ, Wang TC, Zhang LL, Zhou Y, Tong X, Xu JY, Qin LQ. Lactoferrin Prevents Chronic Alcoholic Injury by Regulating Redox Balance and Lipid Metabolism in Female C57BL/6J Mice. Antioxidants (Basel) 2022; 11:antiox11081508. [PMID: 36009227 PMCID: PMC9405310 DOI: 10.3390/antiox11081508] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 06/14/2022] [Revised: 07/19/2022] [Accepted: 07/29/2022] [Indexed: 02/01/2023] Open
Abstract
This study aimed to investigate the preventive effects of lactoferrin (Lf) on chronic alcoholic liver injury (ALI) in female mice. Female C57BL/6J mice were randomly divided into four groups: control group (CON), ethanol administration group (EtOH), low-dose Lf treatment group (LLf), and high-dose Lf group (HLf). In the last three groups, chronic ALI was induced by administering 20% ethanol ad libitum for 12 weeks. Mice in the CON and EtOH groups were fed with AIN-93G diet. Meanwhile, 0.4% and 4% casein in the AIN-93G diet were replaced by Lf as the diets of LLf and HLf groups, respectively. HLf significantly reduced hepatic triglyceride content and improved pathological morphology. HLf could inhibit cytochrome P450 2E1 overexpression and promote alcohol dehydrogenase-1 expression. HLf activated protein kinase B and AMP-activated protein kinase (AMPK), as well as upregulating nuclear-factor-erythroid-2-related factor-2 expression to elevate hepatic antioxidative enzyme activities. AMPK activation also benefited hepatic lipid metabolism. Meanwhile, HLf had no obvious beneficial effects on gut microbiota. In summary, Lf could alleviate chronic ALI in female mice, which was associated with redox balance and lipid metabolism regulation.
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Affiliation(s)
- De-Ming Li
- School of Public Health, Suzhou Medical College of Soochow University, 199 Renai Road, Suzhou 215123, China; (D.-M.L.); (Y.-X.W.); (Z.-Q.H.); (T.-C.W.); (L.-L.Z.); (Y.Z.)
| | - Yun-Xuan Wu
- School of Public Health, Suzhou Medical College of Soochow University, 199 Renai Road, Suzhou 215123, China; (D.-M.L.); (Y.-X.W.); (Z.-Q.H.); (T.-C.W.); (L.-L.Z.); (Y.Z.)
| | - Zhi-Qiang Hu
- School of Public Health, Suzhou Medical College of Soochow University, 199 Renai Road, Suzhou 215123, China; (D.-M.L.); (Y.-X.W.); (Z.-Q.H.); (T.-C.W.); (L.-L.Z.); (Y.Z.)
| | - Tian-Ci Wang
- School of Public Health, Suzhou Medical College of Soochow University, 199 Renai Road, Suzhou 215123, China; (D.-M.L.); (Y.-X.W.); (Z.-Q.H.); (T.-C.W.); (L.-L.Z.); (Y.Z.)
| | - Li-Li Zhang
- School of Public Health, Suzhou Medical College of Soochow University, 199 Renai Road, Suzhou 215123, China; (D.-M.L.); (Y.-X.W.); (Z.-Q.H.); (T.-C.W.); (L.-L.Z.); (Y.Z.)
| | - Yan Zhou
- School of Public Health, Suzhou Medical College of Soochow University, 199 Renai Road, Suzhou 215123, China; (D.-M.L.); (Y.-X.W.); (Z.-Q.H.); (T.-C.W.); (L.-L.Z.); (Y.Z.)
| | - Xing Tong
- Laboratory Center, Suzhou Medical College of Soochow University, 199 Renai Road, Suzhou 215123, China;
| | - Jia-Ying Xu
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Suzhou Medical College of Soochow University, 199 Renai Road, Suzhou 215123, China
- Correspondence: (J.-Y.X.); (L.-Q.Q.)
| | - Li-Qiang Qin
- School of Public Health, Suzhou Medical College of Soochow University, 199 Renai Road, Suzhou 215123, China; (D.-M.L.); (Y.-X.W.); (Z.-Q.H.); (T.-C.W.); (L.-L.Z.); (Y.Z.)
- Correspondence: (J.-Y.X.); (L.-Q.Q.)
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Wang TC, Han ZY, Wang PS, Lin HC, Luo SW, Gong LZ. Correction to Enantioselective Synthesis of 5-Alkylated Thiazolidinones via Palladium-Catalyzed Asymmetric Allylic C-H Alkylations of 1,4-Pentadienes with 5 H-Thiazol-4-ones. Org Lett 2022; 24:3907. [PMID: 35588161 DOI: 10.1021/acs.orglett.2c01526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Lv CX, Zhang Q, Li C, Li YG, Li ET, Li ZR, Wang TC. Complement Factor H is a Novel Biomarker for Diagnosis and Prognosis of Patients with Liver Cancer. Indian J Pharm Sci 2022. [DOI: 10.36468/pharmaceutical-sciences.spl.452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Affiliation(s)
- Khemayanto Hidayat
- Department of Nutrition and Food Hygiene, School of Public Health, Soochow University, Suzhou, China
| | - Jing-Si Chen
- Department of Nutrition and Food Hygiene, School of Public Health, Soochow University, Suzhou, China
| | - Hai-Peng Wang
- Department of Cardiology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Tian-Ci Wang
- Department of Nutrition and Food Hygiene, School of Public Health, Soochow University, Suzhou, China
| | - Yu-Jie Liu
- Department of Nutrition and Food Hygiene, School of Public Health, Soochow University, Suzhou, China
| | - Xue-Ying Zhang
- Department of Medical Technology, Suzhou Vocational Health College, Suzhou, China
| | - Chun-Ping Rao
- Department of Medical Technology, Suzhou Vocational Health College, Suzhou, China
| | - Jian-Wei Zhang
- Department of Nutrition, Suzhou Municipal Hospital, Suzhou, China
| | - Li-Qiang Qin
- Department of Nutrition and Food Hygiene, School of Public Health, Soochow University, Suzhou, China
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Wang TC, Zhu L, Luo S, Nong ZS, Wang PS, Gong LZ. Palladium-Catalyzed Enantioselective C(sp 3)-H/C(sp 3)-H Umpolung Coupling of N-Allylimine and α-Aryl Ketones. J Am Chem Soc 2021; 143:20454-20461. [PMID: 34817997 DOI: 10.1021/jacs.1c10721] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Asymmetric functionalization of the C(sp3)-H bond is an attractive yet challenging strategy to achieve versatile bond-forming events, enabling the precise assembly of molecular complexity with minimal manipulation of functional groups. Here, we report an asymmetric C(sp3)-H/C(sp3)-H umpolung coupling of N-allylimine and coordinating α-aryl carbonyls by using chiral phosphoramidite-palladium catalysis. A wide variety of α-heteroaryl ketones and 2-acylimidazoles are nicely tolerated to open a convenient and tunable avenue for efficient synthesis of enantioenriched β-amino-γ,δ-unsaturated carbonyl derivatives with high levels of regio- and stereoselectivities, capable of providing a key intermediate for asymmetric synthesis of Focalin. This protocol showcases an umpolung reactivity of the N-allylimines through a concerted proton and two-electron transfer process to cleave the allylic C-H bond, effectively complementing established methodology for allylic C-H functionalization. An inner-sphere allylation pathway for both α-heteroaryl carbonyls and 2-acylimidazoles to attack the π-allylpalladium species is suggested by computational studies and experimental facts, wherein the nitrogen coordination to the palladium center enables the preference of branched regioselectivity.
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Affiliation(s)
- Tian-Ci Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Ling Zhu
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Shiwei Luo
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Zhong-Sheng Nong
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Pu-Sheng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Liu-Zhu Gong
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.,Center for Excellence in Molecular Synthesis of CAS, University of Science and Technology of China, Hefei 230026, China
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Wang TC, Wang PS, Chen DF, Gong LZ. Access to chiral homoallylic vicinal diols from carbonyl allylation of aldehydes with allyl ethers via palladium-catalyzed allylic C-H borylation. Sci China Chem 2021. [DOI: 10.1007/s11426-021-1134-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Hidayat K, Chen JS, Wang TC, Liu YJ, Shi YJ, Su HW, Liu B, Qin LQ. The Effects of Milk Supplementation on Bone Health Indices in Adults: A Meta-Analysis of Randomized Controlled Trials. Adv Nutr 2021; 13:1186-1199. [PMID: 34792092 PMCID: PMC9340984 DOI: 10.1093/advances/nmab136] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [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: 09/08/2021] [Revised: 10/14/2021] [Accepted: 11/15/2021] [Indexed: 01/23/2023] Open
Abstract
Milk contains a number of bone-beneficial nutrients. However, milk, due to the D-galactose content, might have unfavorable effects on bone health. A meta-analysis of randomized controlled trials (RCTs) was performed to clarify the effects of milk supplementation on bone mineral density (BMD), bone turnover markers [N-terminal telopeptide of type I collagen (NTx), C-terminal telopeptide of type 1 collagen (CTx), osteocalcin, bone alkaline phosphatase (BALP), and procollagen type 1 N-propeptide (P1NP)], and hormonal indices related to bone metabolism [parathyroid hormone (PTH), 25-hydroxyvitamin D [25(OH)D], and insulin-like growth factor 1 (IGF-1)] in adults. The PubMed and Web of Science databases were searched. A random-effects model was used to estimate the pooled effect sizes. A total of 20 RCTs were included. The trial duration ranged from 1 mo to 36 mo. Milk supplementation resulted in a small but significant increase in BMD at the hip (+0.004 g/cm2; n = 9 RCTs) and lumbar spine (+0.025 g/cm2; n = 7), but did not significantly affect whole-body BMD (n = 3) and femoral neck BMD (n = 7). Milk supplementation reduced the concentrations of P1NP (-5.20 ng/mL; n = 9), CTx (-0.16 ng/mL; n = 9), and NTx (-8.66 nmol bone collagen equivalents/mmol creatinine; n = 3). The concentrations of osteocalcin (n = 9) and BALP (n = 3) were not affected by milk supplementation. Reduced parathyroid hormone PTH (-1.01 pg/mL; n = 13) concentrations and increased IGF-1 (+1.79 nmol/l; n = 4) concentrations were observed with milk supplementation. 25(OH)D (+3.73 ng/mL; n = 11) concentrations were increased with vitamin-D fortified milk supplementation. The addition of milk to the diet may potentially increase the likelihood of preventing bone loss by restoring bone homeostasis through the modulation of the calcium-vitamin D-PTH axis, bone remodeling rate, and growth hormone/IGF-1 axis.
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Affiliation(s)
| | - Jing-Si Chen
- Department of Nutrition and Food Hygiene, School of Public Health, Soochow University, Suzhou, China
| | - Tian-Ci Wang
- Department of Nutrition and Food Hygiene, School of Public Health, Soochow University, Suzhou, China
| | - Yu-Jie Liu
- Department of Nutrition and Food Hygiene, School of Public Health, Soochow University, Suzhou, China
| | - Yu-Jie Shi
- Branch Company, Inner Mongolia Yili Industrial Group Co. Ltd., Hohhot, China
| | - Hong-Wen Su
- Branch Company, Inner Mongolia Yili Industrial Group Co. Ltd., Hohhot, China
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14
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Chen YF, Ren D, Geng LD, Yao SQ, Song ZH, Guang L, Wang TC, Wang PC. Treatment of posterolateral tibial plateau fractures with a rotational support plate and special pressurizer: technical note and retrospective case series. J Orthop Surg Res 2021; 16:407. [PMID: 34162413 PMCID: PMC8220735 DOI: 10.1186/s13018-021-02544-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 06/08/2021] [Indexed: 11/24/2022] Open
Abstract
Background In tibial plateau fractures, the posterolateral segment of the tibia plateau is frequently affected and challenging to treat. Although there are many surgical approaches and fixation methods for the treatment of these fractures, all of these methods have limitations. We designed a new rotational support plate (RSP) and a special pressurizer that can fix the fracture directly via the anterolateral approach. This method is advantageous because it leads to little trauma, involves a simple operation, and has a reliable fixation effect. This study details the technique of treating these fractures with the RSP and special pressurizer and provides the outcomes. Methods From May 2016 to January 2019, the data of 12 patients with posterolateral tibial plateau fractures treated with the RSP and special pressurizer in our hospital were retrospectively analyzed. Postoperative rehabilitation was advised, knee X-rays were taken at follow-ups, and fracture healing, complications, and knee range of motion were assessed. The Hospital for Special Surgery (HSS) knee score and Knee Injury and Osteoarthritis Outcome Score (KOOS) were used to evaluate knee function at the last follow-up. Results The average follow-up time of all patients was 16.5 months (range, 12–25 months). The average bony union time was 3.2 months (range, 3–4.5 months). At the last follow-up, the average knee range of motion was 138° (range, 107–145°). The average HSS score was 91 (range, 64–98). The average KOOS Symptoms score was 90 (range, 75–96). The average KOOS Pain score was 91 (range, 72–97). The average KOOS ADL score was 91 (range, 74–97). The average KOOS sport/recreation score was 83 (range, 70–90). The average KOOS QOL score was 88 (range, 69–93). Skin necrosis, incision infections, and fixation failure did not occur during the follow-up period. Conclusions With our newly designed RSP and special pressurizer, posterolateral tibial plateau fractures can be easily and effectively reduced and fixed through the anterolateral approach, which serves as a novel treatment for posterolateral tibial plateau fractures. Supplementary Information The online version contains supplementary material available at 10.1186/s13018-021-02544-w.
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Affiliation(s)
- Yu-Feng Chen
- Orthopaedic Trauma Service Center, Major Laboratory of Orthopaedic Biomechanics in Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei Province, China
| | - Dong Ren
- Orthopaedic Trauma Service Center, Major Laboratory of Orthopaedic Biomechanics in Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei Province, China
| | - Lin-Dan Geng
- Orthopaedic Trauma Service Center, Major Laboratory of Orthopaedic Biomechanics in Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei Province, China
| | - Shuang-Quan Yao
- Orthopaedic Trauma Service Center, Major Laboratory of Orthopaedic Biomechanics in Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei Province, China
| | - Zhao-Hui Song
- Orthopaedic Trauma Service Center, Major Laboratory of Orthopaedic Biomechanics in Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei Province, China
| | - Liang Guang
- Orthopaedic Trauma Service Center, Major Laboratory of Orthopaedic Biomechanics in Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei Province, China
| | - Tian-Ci Wang
- Orthopaedic Trauma Service Center, Major Laboratory of Orthopaedic Biomechanics in Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei Province, China
| | - Peng-Cheng Wang
- Orthopaedic Trauma Service Center, Major Laboratory of Orthopaedic Biomechanics in Hebei Province, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei Province, China.
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15
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Shin AE, Good HJ, Tesfagiorgis Y, Zhang L, Kerfoot S, Sherman PM, Wang TC, Howlett CJ, Asfaha S. A1 F4/80+LY6CHI MACROPHAGES ARE KEY TO CANCER INITIATION IN COLITIS. J Can Assoc Gastroenterol 2021. [DOI: 10.1093/jcag/gwab002.000] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Colorectal cancer (CRC) is the third leading cause of cancer death, with a major risk factor being chronic inflammation. Thus, patients with inflammatory bowel disease (IBD) are at an increased risk of CRC. Despite the clear association between inflammation and cancer, the mechanism by which colitis leads to CRC is still not well understood.
Aims
In this study, we aim to explore the mechanism by which inflammation contributes to the initiation of colitis-associated cancer (CAC). We hypothesize that dextran sodium sulfate (DSS)-induced colitis leads to the infiltration of a specific immune cell type associated with tumorigenesis.
Methods
Following an injection of azoxymethane (AOM), mice were treated with the colitis-inducing agents DSS, trinitrobenzene sulfonic acid (TNBS), oxazolone (oxa), Citrobacter rodentium, or Doxorubicin (Doxo). The tumor studies were repeated using our published Cre-dependent murine model of CAC. To generate tamoxifen-inducible Cre transgenic mice that allow for Dclk1+ cell lineage tracing and cell-specific knock-out of the tumor suppressor adenomatous polyposis coli (APC), we crossed our Dclk1CreERT2 mice to both ROSA26tdTomato and APCfl/fl mice (Dclk1/APCfl/fl).
Results
Treatment with DSS, TNBS, oxa, C. rodentium, or Doxo induced colonic inflammation as detected by increased myeloperoxidase (MPO) activity and histologic analysis. DSS administration led to colonic tumors, whereas TNBS, oxa, C. rodentium, or Doxo did not lead to tumorigenesis up to 52 weeks following colitis induction. Upon flow cytometric analysis of several types of immune cells in the colonic tissue, we observed no difference in the number of T and B cells between mice treated with various colitis inducing agents. We did, however, detect significantly increased levels of Ly6G+ neutrophils and F4/80+Ly6Chi macrophages in the DSS-treated mice when compared to mice in the other models of colitis. mRNA and protein array analyses of the colonic tissue, as well as analysis of the RNA-seq data from 206 UC patients (GSE109142), revealed upregulated expression of genes associated with macrophages and neutrophils. Addition of macrophage-produced cytokines, such as IL-1β, TNF-α, or IL-6, induced lineage tracing of Dclk1+ tuft cells in intestinal organoids. Clodronate liposome-mediated depletion of F4/80+Ly6Chi macrophages significantly reduced the number of colonic tumors but did not affect tumor size in Dclk1/APCfl/fl mice.
Conclusions
Our data suggest that infiltration of F4/80+Ly6Chi macrophages, unique to DSS-induced colitis, leads to colonic tumor formation. This demonstrates that specific immune cell types, rather than the presence of colonic inflammation, plays an important role in the initiation of CAC.
Funding Agencies
CAG, CIHR
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Affiliation(s)
- A E Shin
- Western University Schulich School of Medicine and Dentistry, London, ON, Canada
| | - H J Good
- Western University Schulich School of Medicine and Dentistry, London, ON, Canada
| | - Y Tesfagiorgis
- Western University Department of Microbiology and Immunology, London, ON, Canada
| | - L Zhang
- Western University Schulich School of Medicine and Dentistry, London, ON, Canada
| | - S Kerfoot
- Western University Department of Microbiology and Immunology, London, ON, Canada
| | - P M Sherman
- SickKids Research Institute, Toronto, ON, Canada
| | - T C Wang
- Columbia University Irving Medical Center, New York, NY
| | - C J Howlett
- London Health Sciences Centre University Hospital, London, ON, Canada
| | - S Asfaha
- Western University Schulich School of Medicine and Dentistry, London, ON, Canada
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Wang TC, Appiah B, Bonku EM, Yang ZH, Luo L. Establishment of a propolis ethanolic extract self-microemulsifying drug delivery system and its antibacterial activity. Biocatalysis and Agricultural Biotechnology 2021. [DOI: 10.1016/j.bcab.2021.101905] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Shin AE, Good HJ, Tesfagiorgis Y, Zhang L, Kerfoot SM, Sherman PM, Wang TC, Asfaha S. A16 ROLE OF MYELOID CELLS IN THE INITIATION OF COLITIS-ASSOCIATED COLON CANCER. J Can Assoc Gastroenterol 2020. [DOI: 10.1093/jcag/gwz047.015] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Colorectal cancer (CRC) is the second leading cause of cancer death, with a major risk factor being chronic inflammation. Despite the clear association between inflammation and cancer, the mechanism by which colitis leads to CRC is not well understood. We recently showed that the presence of inflammation does not always correlate with colonic tumorigenesis, as the type of colitis (i.e. colitis-inducing agent) appears to be important for tumor initiation.
Aims
In this study, we aim to explore the mechanism by which inflammation contributes to the initiation of colitis-associated cancer. We hypothesized that dextran sodium sulfate (DSS)-induced colitis leads to the infiltration of a specific immune cell type that is associated with colonic tumorigenesis.
Methods
To generate tamoxifen-inducible Cre transgenic mice that allow for Dclk1+ cell lineage tracing and cell-specific knock-out of the tumor suppressor adenomatous polyposis coli (APC), we first crossed our transgenic Dclk1CreERT2 mice to both ROSA26tdTomato and APCfl/fl mice (Dclk1/APCfl/fl). Following Tamoxifen induction, mice were treated with the colitis-inducing agents DSS, trinitrobenzene sulfonic acid (TNBS), oxazolone, or Citrobacter rodentium. The tumor studies were repeated using azoxymethane (AOM)-DSS induced colitis-associated cancer model.
Results
Treatment with any of the four colitis-inducing agents (DSS, TNBS, oxazolone, or C. rodentium) induced colonic inflammation as detected by increased myeloperoxidase (MPO) activity and histologic analysis. Interestingly, DSS administration led to colonic tumors, whereas TNBS, oxazolone, or C. rodentium did not, even up to 52 weeks following colitis induction. FACS analysis of immune cells in the colon revealed no difference in the number of T or B cells in mice treated with any of the colitis-inducing agents. We did, however, detect significantly increased levels of Ly6G+ neutrophils and F4/80+ macrophages in DSS-treated mice compared to mice in any of the other three models of colitis. Consistent with this myeloid cell infiltration, significantly upregulated protein levels of G-CSF, IL-6, TNF-α, and CXCL1 were detected in DSS-treated mice compared to the other three models of colitis. IL-1α, IL-1β, IL-4, IL-10, and TGF-β levels were unchanged.
Conclusions
Our data suggest that infiltration of Ly6G+ neutrophils and pro-inflammatory F4/80+ macrophages, unique to DSS-induced colitis, contributes to colonic tumor formation. These data demonstrate that specific immune cell types, rather than the presence of colonic inflammation, play a critical role in the initiation of colitis-associated CRC.
Funding Agencies
CAG, CIHR
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Affiliation(s)
- A E Shin
- Pathology and Laboratory Medicine, University of Western Ontario, London, ON, Canada
| | - H J Good
- University of Western Ontario, London, ON, Canada
| | - Y Tesfagiorgis
- Pathology and Laboratory Medicine, University of Western Ontario, London, ON, Canada
| | - L Zhang
- Pathology and Laboratory Medicine, University of Western Ontario, London, ON, Canada
| | - S M Kerfoot
- Pathology and Laboratory Medicine, University of Western Ontario, London, ON, Canada
| | - P M Sherman
- The Hospital for Sick Children, Toronto, ON, Canada
| | - T C Wang
- Columbia University, New York, NY
| | - S Asfaha
- Pathology and Laboratory Medicine, University of Western Ontario, London, ON, Canada
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18
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Lai C, Kuo RN, Wang TC, Chan KA. P5516Short-term and long-term mortality among acute myocardial infarction patients admitted to hospitals on weekends as compared with weekdays. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0465] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
As in other countries, manpower shortage in weekends and holidays is a common problem in either private hospitals or public hospitals in Taiwan. Whether the manpower shortage in weekends and holidays is associated with poor quality of medical care is a noteworthy subject and several investigations from different countries have been published already.
Purpose
This study examined the difference of short-term and long-term mortality between acute myocardial infraction patients admitted to hospitals on weekends and weekdays in Taiwan.
Methods
We conducted a retrospective, nationwide cohort study based on the National Health Insurance claims database in Taiwan. Adult patients aged 20 years or older who were admitted with a diagnosis of acute myocardial infarction between Jan. 1 2006 and Dec. 31 2014 were identified. Only the first attack of acute myocardial infarction was retained for analysis. The multivariate logistic regression model was applied with adjustment of baseline characteristics at both patient level and hospital level. The outcome variables included in-hospital mortality and one-year cumulative mortality after the index hospitalization.
Results
We identified 53861 patients with acute myocardial infarction as the weekend group, while 130908 patients as the weekday group. The mean age was 68 years old and 68% of the subjects were male in both groups. ST-elevation myocardial infarction constituted 23% of the patients and up to 46% of the subjects underwent percutaneous coronary intervention during the index hospitalization in both groups. Among the weekend group, the in-hospital mortality was 15.8% while the in-hospital mortality was 16.2% in the weekday group (standardized difference = 0.01). The one-year cumulative mortality was 30.2% and 30.9% in the weekend group and the weekday group, respectively (standardized difference = 0.02). The adjusted odds ratio (aOR) concerning in-hospital mortality of the weekend group compared with the weekday group was 0.98 (95% confidence interval [CI]: 0.95–1.01, p=0.11). Also we found no difference in one-year cumulative mortality between the two study groups (aOR = 0.98, 95% CI: 0.96–1.01, p=0.15).
Conclusions
As for acute myocardial infraction patients in Taiwan, admission on weekends or weekdays did not have a significant impact on either in-hospital mortality or one-year cumulative mortality.
Acknowledgement/Funding
Ministry of Science and Technology, the Executive Yuan, Taiwan (MOST 106-2410-H-002-218-, and MOST 107-2410-H-002-237-)
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Affiliation(s)
- C Lai
- National Taiwan University Hospital Hsin-Chu Branch, Hsinchu, Taiwan
| | - R N Kuo
- National Taiwan University, Institute of Health Policy and Management, Taipei, Taiwan
| | - T C Wang
- National Taiwan University, Health Data Research Center, Taipei, Taiwan
| | - K A Chan
- National Taiwan University, Health Data Research Center, Taipei, Taiwan
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19
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Affiliation(s)
- Lian-Feng Fan
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Tian-Ci Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Pu-Sheng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Liu-Zhu Gong
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
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20
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Affiliation(s)
- Tian-Ci Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Lian-Feng Fan
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Yang Shen
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Pu-Sheng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Liu-Zhu Gong
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Center for Excellence in Molecular Synthesis of CAS, Hefei 230026, China
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21
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Shin AE, Good H, Zhang L, Fazio EN, Sherman PM, Wang TC, Asfaha S. A19 ROLE OF LGR5 IN DCLK1 POSITIVE CELL-DERIVED COLITIS-ASSOCIATED COLON CANCER. J Can Assoc Gastroenterol 2019. [DOI: 10.1093/jcag/gwz006.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- A E Shin
- Department of Medicine, Department of Pathology and Laboratory Medicine, Schulich School of Medicine & Dentistry, Western University; London Regional Cancer Program, Lawson Health Research Institute, London, ON, Canada
| | - H Good
- Department of Medicine, Department of Pathology and Laboratory Medicine, Schulich School of Medicine & Dentistry, Western University; London Regional Cancer Program, Lawson Health Research Institute, London, ON, Canada
| | - L Zhang
- Department of Medicine, Department of Pathology and Laboratory Medicine, Schulich School of Medicine & Dentistry, Western University; London Regional Cancer Program, Lawson Health Research Institute, London, ON, Canada
| | - E N Fazio
- Department of Medicine, Department of Pathology and Laboratory Medicine, Schulich School of Medicine & Dentistry, Western University; London Regional Cancer Program, Lawson Health Research Institute, London, ON, Canada
| | - P M Sherman
- Department of Laboratory Medicine and Pathobiology, Faculty of Medicine, University of Toronto; Division of Gastroenterology, Hepatology and Nutrition, Hospital for Sick Children, Toronto, ON, Canada
| | - T C Wang
- Division of Digestive and Liver Diseases, Department of Medicine, Columbia University Medical Center, New York, NY
| | - S Asfaha
- Department of Medicine, Department of Pathology and Laboratory Medicine, Schulich School of Medicine & Dentistry, Western University; London Regional Cancer Program, Lawson Health Research Institute, London, ON, Canada
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22
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Good H, Shin AE, Zhang L, Fazio EN, Meriwether D, Reddy S, Wang TC, Asfaha S. A8 THE ROLE OF CYCLOOXYGENASE IN COLITIS-ASSOCIATED CANCER. J Can Assoc Gastroenterol 2019. [DOI: 10.1093/jcag/gwz006.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- H Good
- Department of Medicine, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada
| | - A E Shin
- Department of Medicine, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada
| | - L Zhang
- Department of Medicine, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada
| | - E N Fazio
- Department of Medicine, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada
| | - D Meriwether
- Department of Medicine, Division of Cardiology, UCLA David Geffen School of Medicine, Los Angeles, CA
| | - S Reddy
- Department of Medicine, Division of Cardiology, UCLA David Geffen School of Medicine, Los Angeles, CA
| | - T C Wang
- Division of Digestive and Liver Disease, Department of Medicine, Columbia University, New York, ON, Canada
| | - S Asfaha
- Department of Medicine, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada
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23
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Lin HC, Xie PP, Dai ZY, Zhang SQ, Wang PS, Chen YG, Wang TC, Hong X, Gong LZ. Nucleophile-Dependent Z/E- and Regioselectivity in the Palladium-Catalyzed Asymmetric Allylic C–H Alkylation of 1,4-Dienes. J Am Chem Soc 2019; 141:5824-5834. [DOI: 10.1021/jacs.8b13582] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hua-Chen Lin
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Pei-Pei Xie
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Zhen-Yao Dai
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Shuo-Qing Zhang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Pu-Sheng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Yu-Gen Chen
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Tian-Ci Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Xin Hong
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Liu-Zhu Gong
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, China
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24
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Wang TC, Han ZY, Wang PS, Lin HC, Luo SW, Gong LZ. Enantioselective Synthesis of 5-Alkylated Thiazolidinones via Palladium-Catalyzed Asymmetric Allylic C–H Alkylations of 1,4-Pentadienes with 5H-Thiazol-4-ones. Org Lett 2018; 20:4740-4744. [DOI: 10.1021/acs.orglett.8b01697] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tian-Ci Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Zhi-Yong Han
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Pu-Sheng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Hua-Chen Lin
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Shi-Wei Luo
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Liu-Zhu Gong
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
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Huang YJ, Yuan YJ, Liu YX, Zhang MY, Zhang JG, Wang TC, Zhang LN, Hu YY, Li L, Xian XH, Qi J, Zhang M. Nitric Oxide Participates in the Brain Ischemic Tolerance Induced by Intermittent Hypobaric Hypoxia in the Hippocampal CA1 Subfield in Rats. Neurochem Res 2018; 43:1779-1790. [PMID: 29995175 DOI: 10.1007/s11064-018-2593-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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: 04/08/2018] [Revised: 06/23/2018] [Accepted: 07/05/2018] [Indexed: 12/30/2022]
Abstract
Previous studies have shown that intermittent hypobaric hypoxia (IH) preconditioning protected neurons survival from brain ischemia. However, the mechanism remains to be elucidated. The present study explored the role of nitric oxide (NO) in the process by measuring the expression of NO synthase (NOS) and NO levels. Male Wistar rats (100) were randomly assigned into four groups: sham group, IH + sham group, ischemia group and IH + ischemia group. Rats for IH preconditioning were exposed to hypobaric hypoxia mimicking 5000 m high-altitude (PB = 404 mmHg, PO2 = 84 mmHg) 6 h/day, once daily for 28 days. Global brain ischemia was established by four-vessel occlusion that has been created by Pulsinelli. Rats were sacrificed at 7th day after the ischemia for neuropathological evaluation by thionin stain. In addition, the expression of neuronal NOS (nNOS), inducible NOS (iNOS), and NO content in the hippocampal CA1 subfield were measured at 2nd day and 7th day after the ischemia. Results revealed that global brain ischemia engendered delayed neuronal death (DND), both nNOS and iNOS expression up-regulated, and NO content increased in the hippocampal CA1 subfield. IH preconditioning reduced neuronal injury induced by the ischemia, and prevented the up-regulation of NOS expression and NO production. In addition, L-NAME + ischemia group was designed to detect whether depressing NO production could alleviate the DND. Pre-administration of L-NAME alleviated DND induced by the ischemia. These results suggest that IH preconditioning plays a protective role by inhibiting the over expression of NOS and NO content after brain ischemia.
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Affiliation(s)
- Ya-Jie Huang
- Undergraduate of Clinical Medicine, Hebei Medical University, Shijiazhuang, 050017, People's Republic of China
| | - Yu-Jia Yuan
- Undergraduate of Clinical Medicine, Hebei Medical University, Shijiazhuang, 050017, People's Republic of China
| | - Yi-Xian Liu
- Department of Physiology, Hebei Medical University, Shijiazhuang, 050017, People's Republic of China
| | - Meng-Yue Zhang
- Undergraduate of Clinical Medicine, Hebei Medical University, Shijiazhuang, 050017, People's Republic of China
| | - Jing-Ge Zhang
- Department of Pathophysiology, Hebei Medical University, No. 361 Zhongshan East Road, Shijiazhuang, 050017, Hebei, People's Republic of China.
| | - Tian-Ci Wang
- Undergraduate of Clinical Medicine, Hebei Medical University, Shijiazhuang, 050017, People's Republic of China
| | - Li-Nan Zhang
- Department of Pathophysiology, Hebei Medical University, No. 361 Zhongshan East Road, Shijiazhuang, 050017, Hebei, People's Republic of China
| | - Yu-Yan Hu
- Department of Pathophysiology, Hebei Medical University, No. 361 Zhongshan East Road, Shijiazhuang, 050017, Hebei, People's Republic of China
| | - Li Li
- Department of Science and Technology, The Second Hospital of Hebei Medical University, 215 Heping West Road, Shijiazhuang, 050000, People's Republic of China
| | - Xiao-Hui Xian
- Department of Pathophysiology, Hebei Medical University, No. 361 Zhongshan East Road, Shijiazhuang, 050017, Hebei, People's Republic of China
| | - Jie Qi
- Department of Pathophysiology, Hebei Medical University, No. 361 Zhongshan East Road, Shijiazhuang, 050017, Hebei, People's Republic of China
| | - Min Zhang
- Department of Pathophysiology, Hebei Medical University, No. 361 Zhongshan East Road, Shijiazhuang, 050017, Hebei, People's Republic of China. .,Aging and Cognition Neuroscience Laboratory of Hebei Province, Shijiazhuang, 050017, People's Republic of China.
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Wang PS, Shen ML, Wang TC, Lin HC, Gong LZ. Access to Chiral Hydropyrimidines through Palladium-Catalyzed Asymmetric Allylic C-H Amination. Angew Chem Int Ed Engl 2017; 56:16032-16036. [PMID: 29063650 DOI: 10.1002/anie.201709681] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Indexed: 12/25/2022]
Abstract
A palladium-catalyzed asymmetric intramolecular allylic C-H amination controlled by a chiral phosphoramidite ligand was established for the preparation of various substituted chiral hydropyrimidinones, the precursors of hydropyrimidines, in high yields with high enantioselectivities. In particular, dienyl sodium N-sulfonyl amides bearing an arylethene-1-sulfonyl group underwent a sequential allylic C-H amination and intramolecular Diels-Alder (IMDA) reaction to produce chiral fused tricyclic tetrahydropyrimidinone frameworks in high yields and with high levels of stereoselectivity. Significantly, this method was used as the key step in an asymmetric synthesis of letermovir.
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Affiliation(s)
- Pu-Sheng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Meng-Lan Shen
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Tian-Ci Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Hua-Chen Lin
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Liu-Zhu Gong
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.,Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, China
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Wang PS, Shen ML, Wang TC, Lin HC, Gong LZ. Access to Chiral Hydropyrimidines through Palladium-Catalyzed Asymmetric Allylic C−H Amination. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709681] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Pu-Sheng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry; University of Science and Technology of China; Hefei 230026 China
| | - Meng-Lan Shen
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry; University of Science and Technology of China; Hefei 230026 China
| | - Tian-Ci Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry; University of Science and Technology of China; Hefei 230026 China
| | - Hua-Chen Lin
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry; University of Science and Technology of China; Hefei 230026 China
| | - Liu-Zhu Gong
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry; University of Science and Technology of China; Hefei 230026 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin China
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Sun L, Luan WL, Wang TC, Su WX, Zhang LX. Room-temperature CO Thermoelectric Gas Sensor based on Au/Co 3O 4 Catalyst Tablet. Nanotechnology 2017; 28:075501. [PMID: 27977004 DOI: 10.1088/1361-6528/aa53f9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A carbon monoxide (CO) thermoelectric (TE) gas sensor was fabricated by affixing a Au/Co3O4 catalyst tablet on a TE film layer. The Au/Co3O4 catalyst tablet was prepared by a co-precipitation and tablet compression method and its possible catalytic mechanism was discussed by means of x-ray diffraction, field emission scanning electron microscopy, high resolution transmission electron microscopy, x-ray photoelectron spectroscopy, temperature-programmed reduction of hydrogen, Fourier transform infrared spectroscopy and Brunauer-Emmett-Teller analysis. The optimal catalyst, with a Au content of 10 wt%, was obtained at a calcination temperature between 200 and 300 °C. The small size of the Au nanoparticles, high specific surface, the existence of Co3+ and water-derived species contributed to high catalytic activity. Based on the optimal Au/Co3O4 catalyst tablet, the CO TE gas sensor worked at room temperature and showed a response voltage signal (ΔV) of 23 mV, high selectivity among hydrogen and methane, high stability, and a fast response time of 106 s for 30 000 ppm CO/air. In addition, a CO concentration in the range of 5000-30 000 ppm could obviously be detected and exhibited a linear relationship with ΔV. The CO TE gas sensor provides a promising option for the detection of CO gas at room temperature.
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Affiliation(s)
- L Sun
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, People's Republic of China
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Wang X, Zang JJ, Wang H, Nie H, Wang TC, Deng XY, Gu YQ, Liu ZH, Jia G. Pulmonary toxicity in mice exposed to low and medium doses of water-soluble multi-walled carbon nanotubes. J Nanosci Nanotechnol 2010; 10:8516-8526. [PMID: 21121361 DOI: 10.1166/jnn.2010.2688] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Carbon nanotubes (CNTs) are a class of new allotrope of carbon. Different functionalized CNTs may vary from their physical and chemical properties to the biological property. In this study, the toxicity of water-soluble taurine multi-walled CNTs (tau-MWNTs), raw MWNTs and positive control crystalline silicon dioxide particles on mouse lungs via intratracheal instillation (i.t.) was investigated. The dosages we used were 0.125, 0.25, 0.5 or 1 mg/kg of tau-MWNTs and raw MWNTs, and 1 mg/kg of silicon dioxide particles; Serum and lungs were collected at 1, 7, 14 or 28 days postexposure. The biochemical and cellular parameters were assessed, which include the ratio of the lung weight and body weight (lung indices), lactate dehydrogenase (LDH), alkaline phosphatase (ALP) and angiotensin converting enzyme (ACE) in serum, and malondialdehyde (MDA), reduced glutathione (GSH), total sulfhydryl group (TSH) in lung tissue homogenates as well as the hydroxyproline in lungs. The characteristic recovery of the lung injury at 28 days postexposure was examined by the assessment of LDH, ALP, lung indices, and histopathology. ACE, MDA, GSH, TSH and histopathological changes showed that tau-MWNTs were less toxic than the raw MWNTs. Histopathological and ultrastructural investigation indicated that the acute pulmonary inflammation in lungs alleviated after 7d postexposure, and were greatly recovered within 28d. Meanwhile, the entrapment of tau-MWNTs reduced greatly by the 28d postexposure. Whereas the heavier pathologic changes induced by raw MWNTs lasted 7 days more than that of tau-MWNTs. Notably, no occurrence of granulomas and fibrosis were found in this study both in the two CNTs samples through 28d postexposure. Silicon dioxide particles, on the contrary, produced more severe damage to lungs than CNTs did in lung index, as well as other biochemical and cellular parameters. These findings indicate that water-soluble tau-MWNTs in low and medium doses induce slight and recoverable pulmonary inflammation in mice, and are less toxic than the insoluble raw MWNTs.
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Affiliation(s)
- X Wang
- Department of Occupational and Environmental Health, School of Public Health, Peking University, Beijing 100191, PR China
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Sheu ZM, Chen JR, Wang TC. First Report of the A2 Mating Type of Phytophthora capsici Infecting Peppers (Capsicum annuum) in Taiwan. Plant Dis 2009; 93:548. [PMID: 30764148 DOI: 10.1094/pdis-93-5-0548c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Phytophthora capsici Leonion was first identified on pepper (Capsicum annuum L) in Taiwan in 1976. At that time, only the A1 mating type was present (2). In 2007, the A2 mating type of P. capsici was identified on tomato and eggplant in the central part of the country (1). During an excessively rainy period in mid-2008, many chili and sweet pepper fields in Taiwan suffered severe losses due to P. capsici. Symptoms included a foliar blight and stem, root, and fruit rot. Plants eventually wilted and died. Symptomatic plants were collected from chili- and sweet pepper-production areas in central, southern, and eastern Taiwan. Fifty-three isolates from single zoospores were identified by PCR using species-specific primers CAPFW/CAPRV2 (4). Mating type was determined by co-inoculating rape seed agar plates (3) with mycelial plugs of the tester and a known isolate. Pc134, maintained by the mycology unit at The World Vegetable Center, and 27220, provided by P. J. Ann at the Taiwan Agricultural Research Institute, were used as reference isolates of A1 and A2 mating types, respectively. Plates were examined microscopically for oospores after 5 to 7 days of incubation at 24°C in the dark. Of the 53 isolates, 15 were identified as the A2 mating type and the remaining 38 isolates were identified as A1. The A2 mating type was found in the central and southern regions while the A1 mating type was widely distributed across all three regions. The sporangia of the A2 mating type were 60.4 to 73.4 × 40.9 to 51.8 μm (average 69.2 × 44.7 μm), whereas sporangia of the A1 mating type were 50.1 to 73.9 × 37.9 to 48.1 μm (average 61.4 × 44.1 μm). In general, the A2 mating type produced longer sporangia and only a few isolates produced chlamydospores in V8 broth and on agar. To our knowledge, this is the first report of the A2 mating type of P. capsici infecting peppers in Taiwan. The presence of both mating types in the same field has been observed. References: (1) P. J. Ann et al. Plant Pathol. Bull. 17:69, 2008. (2) L. S. Leu and C. W. Kao. Plant Prot. Bull. (Taiwan) 23:59, 1981. (3) M. M. Sautor. Mycologia 59:161, 1967. (4) C. Silvar et al. Eur. J. Plant Pathol. 112:43, 2005.
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Affiliation(s)
- Z M Sheu
- AVRDC-The World Vegetable Center, P.O. Box 42, Shanhua, Tainan 74199, Taiwan, Republic of China
| | - J R Chen
- AVRDC-The World Vegetable Center, P.O. Box 42, Shanhua, Tainan 74199, Taiwan, Republic of China
| | - T C Wang
- AVRDC-The World Vegetable Center, P.O. Box 42, Shanhua, Tainan 74199, Taiwan, Republic of China
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Abstract
Sf9, a lepidopteran cell line isolated from the fall armyworm, Spodoptera frugiperda, was shown to be significantly more resistant to growth inhibition and apoptosis induction effects of x-ray irradiation than several human cell lines of different origins. The single-cell electrophoresis technique revealed that Sf9 cells showed lower x-ray irradiation-induced DNA damage as well as better efficiency at repairing these damages. In addition, Sf9 cells were lower in both background and x-ray irradiation-induced intracellular oxidative stress, in which the higher intracellular level of reduced glutathione seemed to play a major role. The significance of oxidative stress in determining the radioresistance of Sf9 cells was confirmed by their being more resistant to hydrogen peroxide while equally susceptible to other non-reactive oxygen species of N-nitroso alkylating agents when compared with a human cell line. Although the Sf9 and human cell lines were equally susceptible to the lethal effects of N-nitroso alkylating agents, the components of DNA damage-induced and the repair enzymes involved significantly differ. This phenomenon is also discussed in this report.
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Affiliation(s)
- I-Cheng Cheng
- Department of Entomology, National Taiwan University, Taipei, Taiwan
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Abstract
Genera, Diaporthe and Phomopsis, from an important pathogenic complex of soybean (Glycine max) throughout the world, cause reductions in plant stands, yield, and seed health and quality (1). In a study of the Diaporthe/Phomopsis complex in Taiwan in March 2008, four stem samples with black fruiting structures in linear rows on senescent soybean were collected from the research fields at AVRDC, Shanhua, Tainan, Taiwan. Unidentified fungal isolates were obtained by surface disinfection of infected stems and plating excised tissues on potato dextrose agar (PDA). Colonies of the isolates showed ropelike white mycelia with yellowish tonalities. Small and scattered black stromata were observed frequently in the medium. Mutic pycnidia were found solitarily or aggregated in conidiomata on PDA plates after 10 days of incubation at 24°C with a 12-h photoperiod with near-UV light. All isolates produced α-conidia that measured 8.78 × 3.32 (7.00 to11.00 × 3.00 to 4.00) μm, and sporadically, β-conidia of 30.58 × 0.85 (26.00 to 33.00 × 0.60 to 1.20) μm. Perithecia were not observed in the collected stem samples or the fungal cultures on PDA. Restriction fragment length polymorphism patterns of the PCR products amplified by ITS4 and ITS5 primers for all isolates were identical to the patterns reported for Diaporthe phaseolorum var. sojae (3). Thus, all isolates were identified as D. phaseolorum var. sojae on the basis of morphologic and genetic characteristics (2,3). Pathogenicity was confirmed through inoculations during the V2 growth stage of soybean seedlings by atomizing conidial suspensions (1 × 107 α-conidia/ml) of each isolate on soybean seedlings as well as by injecting the inoculum into soybean stems separately. Four plants in each of three replications were inoculated for each method and six noninoculated plants served as controls. Plants were incubated in a growth chamber at 25°C and maintaining relative humidity at 100% by a humidifier for 48 h in darkness; thereafter, plants were maintained in the greenhouse at temperatures ranging from 23 to 34°C. Seven days after inoculation, red-brown leaf spots and coalescent lesions were observed on seedlings atomized by inoculum suspensions, as well as brown lesions and black pycnida in linear rows observed on plants inoculated by stem injection. No symptoms were observed on noninoculated plants. The fungal isolates obtained from inoculated soybeans were morphologically identical to those used as inoculum. The pathogenicity test was repeated twice. To our knowledge, this is the first explicit report identifying the causal agent of soybean pod and stem blight in Taiwan. The vouchers of infected specimens are available at AVRDC-The World Vegetable Center. Reference: (1) R. P. Mulrooney. Plant Dis. 70:600, 1988. (2) R. N. Pioli et al. Phytopathology 93:136, 2003. (3) A. W. Zhang et al. Phytopathology 88:1306, 1998.
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Affiliation(s)
- C H Chen
- AVRDC-The World Vegetable Center, P.O. Box 42, Shanhua, Tainan 74199, Taiwan
| | - T C Wang
- AVRDC-The World Vegetable Center, P.O. Box 42, Shanhua, Tainan 74199, Taiwan
| | - M J Seo
- National Institute of Crop Science, RDA, 209 Seodum-Dong, Suwon, Republic of Korea, 441-857
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Abstract
Soy isoflavones supplements, which are phyto-oestrogens widely used as alternatives to alleviate menopausal syndromes or prevent chronic diseases, may exert oestrogenic and anti-oestrogenic activities. This study aimed to investigate the effects of soy isoflavones supplement on oestrogen-related autoimmune disease, such as systemic lupus erythematosus, using autoimmune-prone female MRL- lpr/lpr mice. Eighty mice of 8 weeks were divided into five groups: 0 (Control), 2 (Isf 2), 10 (Isf 10) and 20 (Isf 20) mg/kg BW/day Phyto SoyaTM isoflavones or 0.375 mg/kg BW/day tamoxifen (TAM) as the positive control, by tube-feeding. Some mice were killed at age 15 weeks for cellular cytokine secretion. The data suggested that the Isf 20 and TAM groups had higher weight gain and survival compared with the control group. At age 22 weeks, the Isf 20 group still had 75% survival comparable to mice treated with TAM. At age 14 weeks, the TAM group showed significantly lower serum anti-double-stranded (ds) DNA IgG and anti-cardiolipin IgG. The mice in the Isf 10 and Isf 20 groups also had lower anti-dsDNA IgG and anti-cardiolipin IgG. The interferon (IFN)-γ secretion from mitogen-stimulated T cells in the Isf 20 and TAM groups were significantly lower than those of control mice. Furthermore, the oestrogenic activity of the methanol extracts of soy isoflavones for oestrogen receptor (ER)β, but not ERα, significantly increased, suggesting that soy isoflavones have a selective modulation of ER activation. Thus, soy isoflavone supplementation did not aggravate murine lupus, but apparently ameliorated the disease.
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Affiliation(s)
- YH Hong
- Department of Biochemical Science and Technology, Institute of Microbiology and Biochemistry, College of Life Science, National Taiwan University, Taipei, Taiwan, Republic of China
| | - TC Wang
- Department of Biochemical Science and Technology, Institute of Microbiology and Biochemistry, College of Life Science, National Taiwan University, Taipei, Taiwan, Republic of China
| | - CJ Huang
- Department of Biochemical Science and Technology, Institute of Microbiology and Biochemistry, College of Life Science, National Taiwan University, Taipei, Taiwan, Republic of China
| | - WY Cheng
- Department of Biochemical Science and Technology, Institute of Microbiology and Biochemistry, College of Life Science, National Taiwan University, Taipei, Taiwan, Republic of China; Department of Medical Nutrition, I-Shou University, Kaohsiung County, Taiwan, Republic of China
| | - BF Lin
- Department of Biochemical Science and Technology, Institute of Microbiology and Biochemistry, College of Life Science, National Taiwan University, Taipei, Taiwan, Republic of China
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Abstract
BACKGROUND Chronic pancreatitis is a known risk factor for pancreatic adenocarcinoma. Recent work has pointed to a role for bone marrow-derived progenitor cells (BMDCs) in chronic inflammation-based carcinogenesis. Consequently, the role of BMDCs in chronic pancreatitis was investigated. METHODS The fate of BMDCs was followed using green fluorescent protein and the Y chromosome as bone marrow markers in gender-mismatched transplanted mice treated with repeated injections of cerulein for up to 45 weeks. The phenotype of engrafted BMDCs was assessed based on the co-expression of bone marrow and pancreatic markers. RESULTS After 45 weeks of cerulein treatment, mice developed severe chronic pancreatitis but no preneoplastic lesions. BMDCs did engraft in the pancreas. Most of the BMDCs were desmin positive and contributed to 5.12% (1.12%) (mean (SEM)) of the pancreatic stellate cell population. Pancreatic stellate cells derived from the bone marrow could be activated, as demonstrated by alpha-smooth muscle actin expression, suggesting a role in tissue repair. BMDCs could also be found in pancreatic ducts, based on dolichos biflorus agglutinin and cytokeratin 19 stainings, but at a much lower frequency (0.62% (0.11%)). CONCLUSION BMDCs contribute to the pancreatic stellate cell population, suggesting a role in pancreatic tissue repair. In the absence of preneoplastic lesions, BMDCs contribute at a very low level to the ductal epithelium of the chronically inflamed pancreas. The role of BMDCs in pancreatic carcinogenesis remains to be defined.
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Affiliation(s)
- F Marrache
- Division of Digestive and Liver Diseases, Columbia University Medical Center, 1130 St Nicholas Avenue, New York, NY 10032, USA
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Deahl KL, Jones RW, Black LL, Wang TC, Cooke LR. First Report of the A2 Mating Type of Phytophthora infestans on Tomato Crops in Taiwan, Republic of China. Plant Dis 2008; 92:978. [PMID: 30769742 DOI: 10.1094/pdis-92-6-0978a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In a study of the Phytophthora infestans population in Taiwan, samples with symptoms typical of late blight were collected from field crops in an important potato- (Solanum tuberosum) and tomato-(Lycopersicon esculentum) production area in the central highlands region. Isolates were obtained by surface disinfecting leaf sections and plating them onto antibiotic-amended rye A agar (1). After subculturing, the pathogen was confirmed as P. infestans on the basis of morphological characters (2). Mating type was determined by co-inoculating unamended rye agar plates with mycelial plugs of the test isolate and a reference P. infestans isolate of either the A1 or A2 mating type (four plates per test isolate, two with different A1, and two with different A2 reference isolates). After incubation (15°C darkness, 7 to 14 days), plates were examined microscopically for the presence of oospores where the colonies interacted. In 2004, one isolate of 200 tested, and in 2006, one isolate of 102 tested, produced oospores only with A1 reference isolates and were concluded to be A2 mating type. In vitro testing showed the two A2 isolates were metalaxyl-resistant (ED50 values >100 mg of metalaxyl per liter on rye grain agar), which is typical of recent P. infestans isolates from potato and tomato in this area (2). Twenty-one single-sporangial isolates from each of the two A2 strains were tested for mating type against two different A1 isolates of P. infestans and confirmed as A2. These isolates were characterized using the techniques described by Deahl et al. (1) and had the allozyme genotype 100/100/111, 100/100 at the loci coding for glucose-6-phosphate isomerase and peptidase, respectively, and were mitochondrial haplotype IIb. This multi-locus genotype is characteristic of recent P. infestans isolates from tomato and potato in Taiwan, but all previous such isolates were A1 mating type and attributed to the US-11 clonal lineage (1). When evaluated on differential hosts, both A2 isolates were tomato race PH-1 and complex potato race R 0,1,2,3,4,7,9,11. RG57 fingerprinting showed that the A2 isolates had fingerprints identical to each other and to A1 P. infestans isolates of the US-11 clonal lineage from tomato in Taiwan (101 011 100 100 110 101 011 001 1). Koch's postulates were completed and the two A2 isolates were found to be highly aggressive on cultivars of potato and tomato. To our knowledge, this is the first report of A2 mating type strains of P. infestans in the field in Taiwan, but currently, their incidence is very low (<1%). One crop from which an A2 isolate was obtained also yielded an A1 isolate, while A1 isolates were obtained from crops in the vicinity of the other. The concurrent presence of the two mating types of P. infestans poses a risk of sexual reproduction and oospore formation in tomato or potato in Taiwan. References: (1) K. L. Deahl et al. Pest Manag. Sci. 58:951, 2002. (2). D. C. Erwin and O. K. Ribeiro, Page 346 in: Phytophthora Diseases Worldwide. The American Phytopathological Society. St. Paul, MN, 1996.
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Affiliation(s)
- K L Deahl
- USDA, ARS, PSI, Genetic Improvement of Fruits and Vegetable Laboratory, Beltsville, MD 20705
| | - R W Jones
- USDA, ARS, PSI, Genetic Improvement of Fruits and Vegetable Laboratory, Beltsville, MD 20705
| | - L L Black
- Seminis Vegetable Seeds, Inc., 7202 Portage Road, DeForest, WI 53532
| | - T C Wang
- Asian Vegetable Research and Development Center, P.O. Box 42, Shanhua, Tainan 741, Taiwan
| | - L R Cooke
- Applied Plant Science Division, Agri-Food and Biosciences Institute, Newforge Lane, Belfast, Northern Ireland, BT9 5PX, UK
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Chang HJ, Chen TT, Huang LL, Chen YF, Tsai JY, Wang TC, Kuo HC. Optically modulated internal strain in InGaN quantum dots grown on SiN(x) nano masks. Opt Express 2008; 16:920-926. [PMID: 18542166 DOI: 10.1364/oe.16.000920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Optically modulated internal strain has been observed in InGaN quantum dots (QDs) deposited on SiN(x) nano masks. The modulated internal strain can induce a number of intriguing effects, including the change of refractive index and the redshift of InGaN A(1)(LO) phonon. The underlying mechanism can be well accounted for in terms of the variation of internal strain through the converse piezoelectric effect arising from the screening of the internal electric field due to spatial separation of photoexcited electrons and holes. Our results point out a convenient way for the fine tuning of physical properties in nitride-based semiconductor nanostructures, which is very important for high quality optoelectronic devices.
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Affiliation(s)
- H J Chang
- Department of Physics, National Taiwan University, Taipei 106, Taiwan
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Horng SB, Kuo HH, Lin MY, Lin WW, Wang TC. Human gastric cells resistant to (−)-epigallocatechin gallate show cross-resistance to several environmental pollutants. Food Chem Toxicol 2007; 45:2171-8. [PMID: 17619074 DOI: 10.1016/j.fct.2007.05.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2006] [Revised: 12/06/2006] [Accepted: 05/16/2007] [Indexed: 10/23/2022]
Abstract
After a long-term culture in (-)-epigallocatechin gallate (EGCG, 20 microM), a major constituent of green tea, human gastric AGS cells developed 2.2-fold resistance to EGCG. The resistant AGS (AGS-R) cells were cross-resistant to several N-methylcarbamate insecticides, which are among the major control agents for pest insects in Taiwan. The AGS-R cells also showed protective effects against both the cytotoxicity and DNA damage induced by one of the mutagenic derivatives of N-methylcarbamate insecticide, N-nitroso methomyl, which is known to target the mammalian gastric tract. Therefore, acquisition of resistance by AGS cells through chronic exposure to EGCG implies that the tea-drinking habit of the Taiwanese is probably beneficial for the health of the gastric tract. In addition, AGS-R cells were cross-resistant to sodium arsenite and hydrogen peroxide, indicating that tolerance to oxidative stress might play a role in the development of resistance described in this investigation.
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Affiliation(s)
- S B Horng
- Department of Entomology, National Taiwan University, Taiwan
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39
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Przemeck SMC, Varro A, Berry D, Steele I, Wang TC, Dockray GJ, Pritchard DM. Hypergastrinemia increases gastric epithelial susceptibility to apoptosis. ACTA ACUST UNITED AC 2007; 146:147-56. [PMID: 17900712 DOI: 10.1016/j.regpep.2007.09.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2007] [Revised: 08/02/2007] [Accepted: 09/02/2007] [Indexed: 10/22/2022]
Abstract
Plasma concentrations of the hormone gastrin are elevated by Helicobacter pylori infection and by gastric atrophy. It has previously been proposed that gastrin acts as a cofactor during gastric carcinogenesis and hypergastrinemic transgenic INS-GAS mice are prone to developing gastric adenocarcinoma, particularly following H. pylori infection. We hypothesised that the increased risk of carcinogenesis in these animals may partly result from altered susceptibility of gastric epithelial cells to undergo apoptosis. Gastric corpus apoptosis was significantly increased 48 h after 12Gy gamma-radiation in mice rendered hypergastrinemic by transgenic (INS-GAS) or pharmacological (omeprazole treatment of FVB/N mice) methods and in both cases the effects were inhibited by the CCK-2 receptor antagonist YM022. However, no alteration in susceptibility to gamma-radiation-induced gastric epithelial apoptosis was observed in mice overexpressing progastrin or glycine-extended gastrin. Apoptosis was also significantly increased in gastric corpus biopsies obtained from H. pylori-infected humans with moderate degrees of hypergastrinemia. We conclude that hypergastrinemia specifically renders cells within the gastric corpus epithelium more susceptible to induction of apoptosis by radiation or H. pylori. Altered susceptibility to apoptosis may therefore be one factor predisposing to gastric carcinogenesis in INS-GAS mice and similar mechanisms may also be involved in humans.
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Affiliation(s)
- S M C Przemeck
- Division of Gastroenterology, School of Clinical Sciences, University of Liverpool, UK
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40
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Wang TC, Su YP, Hsu TY, Yang CC, Lin CC. 28-Day oral toxicity study of the aqueous extract from spider brake (Pteris multifida Poiret) in rats. Food Chem Toxicol 2007; 45:1757-63. [PMID: 17467135 DOI: 10.1016/j.fct.2007.03.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2006] [Revised: 03/16/2007] [Accepted: 03/16/2007] [Indexed: 11/30/2022]
Abstract
Spider brake (Pteris multifida Poiret) is a very important folk herb and a constituent in most of the traditional herbal beverage formulas in Taiwan; however, little toxicological information is available regarding the safety following repeated exposure. The present study was conducted to evaluate the toxicity of aqueous extract from spider brake (SB) in Sprague-Dawley rats on dietary oral gavage at concentrations of 100, 500, and 1000 mg/kg b.w. day for 28 days. There were no adverse effects on general condition, growth, feed and water consumption, feed conversion efficiency, red blood cell and clotting potential parameters, clinical chemistry values, and organ weights except for neutrophils and lymphocytes being slightly diminished in male and female rats at the highest dose, respectively. Necropsy and histopathology findings revealed no treatment-related changes in any of the organs. The results obtained in this study allowed us to conclude that the SB properly utilized in the traditional oral administration could be devoid of any toxic risk.
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Affiliation(s)
- T C Wang
- Department of Management and Utilization, Fengshan Tropical Horticultural Experiment Station, TARI, Fengshan, Kaohsiung, Taiwan
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41
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Wang TC, Ti MC, Lo SC, Yang CC. Free radical-scavenging activity of aqueous extract of Pteris multifida Poiret. Fitoterapia 2007; 78:248-9. [PMID: 17337330 DOI: 10.1016/j.fitote.2006.11.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2006] [Accepted: 11/29/2006] [Indexed: 10/23/2022]
Abstract
Aqueous extract of Pteris multifida showed scavenging activities on DPPH, hydroxyl radicals and reducing power.
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Affiliation(s)
- T C Wang
- Department of Food Science and Technology, National Pingtung University of Science and Technology, Pingtung, Taiwan, ROC.
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42
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Bowman JC, Abruzzo GK, Flattery AM, Gill CJ, Hickey EJ, Hsu MJ, Kahn JN, Liberator PA, Misura AS, Pelak BA, Wang TC, Douglas CM. Efficacy of caspofungin against Aspergillus flavus, Aspergillus terreus, and Aspergillus nidulans. Antimicrob Agents Chemother 2006; 50:4202-5. [PMID: 17015628 PMCID: PMC1693977 DOI: 10.1128/aac.00485-06] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The echinocandin caspofungin is a potent inhibitor of the activity of 1,3-beta-D-glucan synthase from Aspergillus flavus, Aspergillus terreus, and Aspergillus nidulans. In murine models of disseminated infection, caspofungin prolonged survival and reduced the kidney fungal burden. Caspofungin was at least as effective as amphotericin B against these filamentous fungi in vivo.
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Affiliation(s)
- J C Bowman
- Department of Infectious Disease Research, Merck Research Laboratories, RY80Y-260, P.O. Box 2000, Rahway, NJ 07065-0900, USA.
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43
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Abstract
p73, a new p53 family member, is a transcription factor that is increasingly recognized in cancer research as an important player in tumorigenesis as well as in chemotherapeutic drug sensitivity. Despite the substantial structural and functional similarities to p53, accumulating evidence suggests that p53 and p73 may differently regulate their transcriptional targets. In this study, we have investigated the role of p73 in regulation of the gastrin gene promoter. Gastrin is a peptide hormone and an important factor in determining the progression of a number of human malignancies. Our results show that p73 can bind to the gastrin promoter. This leads to transcriptional upregulation of gastrin mRNA. We also found that the levels of gastrin and p73 transcripts correlate in primary gastric tumors. Taken together, our results demonstrate a novel mechanism for regulation of gastrin gene transcription and support a concept that p53 and p73 may have different biological roles in tumors.
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Affiliation(s)
- K Tomkova
- Department of Surgery, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
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44
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Sheu ZM, Wang TC. First Report of Race 2 of Fusarium oxysporum f. sp. lycopersici, the Causal Agent of Fusarium Wilt on Tomato in Taiwan. Plant Dis 2006; 90:111. [PMID: 30786495 DOI: 10.1094/pd-90-0111c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Fusarium wilt caused by Fusarium oxysporum Schlechtend.:Fr. f. sp. lycopersici (Sacc.) W.C. Snyder & N.H. Hans. is a destructive disease of tomato crops worldwide. The use of resistant varieties is the best strategy for disease control. There are three reported races of the pathogen. Recent surveys indicated that many of the commercial cultivars with resistance to F. oxysporum f. sp. lycopersici race 1 planted in Taiwan displayed Fusarium wilt symptoms. Yellowing on the older leaves was observed on one side of the stems close to fruit maturity. The yellowing gradually affected most of the foliage and was accompanied by wilting of the plants. The vascular tissue was usually dark brown and discoloration extended to the apex. The wilting became more extensive until plants collapsed and died. A total of 87 isolates obtained from typical diseased plants throughout Taiwan from 2002 to 2005 were analyzed to determine the race and distribution of this pathogen in Taiwan. Isolates were confirmed at the species level using F. oxysporum-specific primers FOF1 and FOR1 (4). Subsequently, isolates were characterized for pathogenicity, race and restriction fragment length polymorphisms of the intergenic spacer region of rDNA (IGS-RFLP) with two reference isolates, Fol 11A (race 1) and Fol 34-1 (race 2). Pathogenicity tests and race determination were conducted using root-dip inoculation (3) on 2-week-old seedlings of host differentials Bonny Best (no resistance), UC82-L (resistant to race 1), and Florida MH-1 (resistant to races 1 and 2). Thirty-six seedlings of each cultivar were arranged into three replications and inoculated with each isolate. Disease reaction was evaluated 3 weeks after inoculation. The disease severity rating (DSR) was determined on individual plants according to the following scale: 0 = plant healthy without external symptoms; 1 = slight vascular discoloration with or without stunted growth; 2 = severe vascular discoloration usually with stunted growth; and 3 = plant wilted beyond recovery or dead. The presence of severe vascular discoloration indicated a susceptible reaction. All isolates were race 2, and over 70% of the isolates showed strong virulence with a DSR >2 on cvs. Bonny Best and UC-82L. This result was different from a previous report of race 1 from Taiwan (2). Two IGS-RFLP haplotypes generated by EcoRI, RsaI, and HaeIII digestions (1) were identified. Eighty-six isolates displayed one banding pattern, and one unique isolate displayed a second banding pattern. The results demonstrated the predominance of race 2 and low diversity within the Taiwan population. To our knowledge, this is the first report regarding the predominant race and IGS-RFLP haplotype identification of F. oxysporum f. sp. lycopersici in Taiwan. Our study indicates that tomato varieties in Taiwan should possess resistance to race 2. References: (1) G. Cai et al. Phytopathology 93:1014, 2003. (2) K. S. Elias and R. W. Schneider. Phytopathology 82:1421, 1992. (3) J. W. Gerdemann and A. M. Finley. Phytopathology 41:238, 1951. (4) P. K. Mishra et al. FEMS Microbiol. Lett. 218:329, 2003.
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Affiliation(s)
- Z M Sheu
- AVRDC-The World Vegetable Center, Tainan, Taiwan, R.O.C
| | - T C Wang
- AVRDC-The World Vegetable Center, Tainan, Taiwan, R.O.C
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45
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Abstract
BACKGROUND Breast tumour kinase (BRK) is a newly identified non-receptor protein tyrosine kinase from a metastatic breast tumour. Its biological functions are still under extensive investigation. The mouse homologue Sik (Src-related intestinal kinase) has been implicated in mouse keratinocyte differentiation; however, not much is known about the functions of BRK in human cutaneous biology. OBJECTIVES Using HaCaT cells as an experimental model, to explore the mutual relationships between BRK and differentiation of human keratinocytes. METHODS Archival paraffin blocks of normal and pathological skin were retrieved for examining the in vivo distribution of BRK. Its expression and subcellular localization were examined via indirect immunofluorescence, and quantitative changes were analysed by Northern and Western blots. The kinase activity of BRK was determined by its autophosphorylation and phosphorylation of exogenous substrate in the in vitro kinase assay. Using a retroviral infection method, we established stably transfected HaCaT cells expressing vector, wild-type BRK or a kinase-defective mutant (K219M). Expression of the differentiation marker keratin 10 (K10) was compared among these cells using semiquantitative reverse transcription-polymerase chain reaction. Results Histochemical examination showed that BRK was expressed exclusively in suprabasal keratinocytes. Its distribution was both cytoplasmic and intranuclear. An enhanced regional suprabasal expression pattern was observed in the confluent areas of cell cultures. The expression of BRK transcript and protein was up-regulated in prolonged confluence culture in a serum-dependent manner. Its kinase activity was activated shortly after the addition of calcium and ionomycin and returned to the basal level within 30 min. Overexpression of wild-type BRK moderately promoted the expression of K10 transcript while the kinase-defective BRK mutant exerted a prominent suppressive effect. CONCLUSIONS The in vivo distribution of BRK and its up-regulation during in vitro differentiation of HaCaT cells, together with the activation of its kinase activity by calcium/ionomycin and its influence on K10 expression, all indicate a role for BRK in the complex process of keratinocyte differentiation.
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Affiliation(s)
- T C Wang
- Department of Dermatology, College of Medicine, National Taiwan University and National Taiwan University Hospital, Taipei, Taiwan
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46
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Kim KS, Wang TC, Yang XB. Simulation of apparent infection rate to predict severity of soybean rust using a fuzzy logic system. Phytopathology 2005; 95:1122-1131. [PMID: 18943463 DOI: 10.1094/phyto-95-1122] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
ABSTRACT Few biologically based models to assess the risk of soybean rust have been developed because of difficulty in estimating variables related to infection rate of the disease. A fuzzy logic system, however, can estimate apparent infection rate by combining meteorological variables and biological criteria pertinent to soybean rust severity. In this study, a fuzzy logic apparent infection rate (FLAIR) model was developed to simulate severity of soybean rust and validated using data from field experiments on two soybean cultivars, TK 5 and G 8587. The FLAIR model estimated daily apparent infection rate of soybean rust and simulated disease severity based on population dynamics. In weekly simulation, the FLAIR model explained >85% of variation in disease severity. In simulation of an entire epidemic period, the FLAIR model was able to predict disease severity accurately once initial values of disease severity were predicted accurately. Our results suggest that a model could be developed to determine apparent infection rate and an initial value of disease severity in advance using forecasted weather data, which would provide accurate prediction of severity of soybean rust before the start of a season.
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Hsu TY, Sheu SC, Liaw ET, Wang TC, Lin CC. Anti-oxidant activity and effect of Pinus morrisonicola Hay. on the survival of leukemia cell line U937. Phytomedicine 2005; 12:663-9. [PMID: 16194054 DOI: 10.1016/j.phymed.2004.03.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The free radical scavenging and anti-cancer activites of Pinus morrisonicola Hay. were studied using different parts of the pine, namely, needle, bark and cone. Results showed that pine needle water extract has the highest scavenging superoxide anion activity and the lowest IC50 value in inhibiting superoxide anion formation; however, the bark water extract showed the best anti-lipid peroxidation activity. Additionally, needle water extract displayed the highest inhibition of leukemia cell line U937 growth. The results indicated that P. morrisonicola Hay. possesses potential chemopreventative and therapeutic properties.
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Affiliation(s)
- T Y Hsu
- Department of Food Science and Technology, National Pingtung University of Science and Technology, Neipu, Pingtung, Taiwan, ROC
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48
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Ottewell PD, Varro A, Dockray GJ, Kirton CM, Watson AJM, Wang TC, Dimaline R, Pritchard DM. COOH-terminal 26-amino acid residues of progastrin are sufficient for stimulation of mitosis in murine colonic epithelium in vivo. Am J Physiol Gastrointest Liver Physiol 2005; 288:G541-9. [PMID: 15486344 DOI: 10.1152/ajpgi.00268.2004] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [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: 01/31/2023]
Abstract
Transgenic mice (hGAS) that overexpress human progastrin are more susceptible than wild-type mice (FVB/N) to the induction of colonic aberrant crypt foci (ACF) and adenomas by the chemical carcinogen azoxymethane. We have previously shown significantly increased levels of colonic mitosis in hGAS compared with FVB/N mice after gamma-radiation. To investigate whether the effects of progastrin observed in hGAS colon require the presence of other forms of circulating gastrin, we have crossed hGAS (hg(+/+)) with gastrin knockout (G(-/-)) mice to generate mice that express progastrin and no murine gastrin (G(-/-)hg(+/+)). After azoxymethane, G(-/-)hg(+/+) mice developed significantly more ACF than control G(-/-)hg(-/-) mice (which do not express any forms of gastrin). G(-/-)hg(+/+) mice also exhibited significantly increased colonic mitosis both before and after exposure to 8 Gray Gy gamma-radiation or 50 mg/kg azoxymethane compared with G(-/-)hg(-/-). Treatment of G(-/-)hg(-/-) mice with synthetic progastrin (residues 21-101 of human preprogastrin) or G17 extended at its COOH terminus corresponding to the COOH-terminal 26-amino-acid residues of human preprogastrin (residues 76-101, G17-CFP) resulted in continued colonic epithelial mitosis after gamma-radiation, whereas glycine-extended gastrin-17 and the COOH-terminal tryptic fragment of progastrin [human preprogastrin-(96-101)] had no effect. Immunoneutralization with an antibody against G17-CFP before gamma-radiation significantly decreased colonic mitosis in G(-/-)hg(+/+) mice to levels similar to G(-/-)hg(-/-). We conclude that progastrin does not require the presence of other forms of gastrin to exert proliferative effects on colonic epithelia and that the portion of the peptide responsible for these effects is contained within amino acid residues 76-101 of human preprogastrin.
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Affiliation(s)
- P D Ottewell
- Deptartment of Medicine, 5th Fl. UCD Bldg., Daulby St., Liverpool L69 3BX, UK
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Washburn WN, Sun CQ, Bisacchi G, Wu G, Cheng PT, Sher PM, Ryono D, Gavai AV, Poss K, Girotra RN, McCann PJ, Mikkilineni AB, Dejneka TC, Wang TC, Merchant Z, Morella M, Arbeeny CM, Harper TW, Slusarchyk DA, Skwish S, Russell AD, Allen GT, Tesfamariam B, Frohlich BH, Abboa-Offei BE, Cap M, Waldron TL, George RJ, Young D, Dickinson KE, Seymour AA. BMS-201620: a selective beta 3 agonist. Bioorg Med Chem Lett 2004; 14:3525-9. [PMID: 15177466 DOI: 10.1016/j.bmcl.2004.04.074] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2004] [Accepted: 04/19/2004] [Indexed: 11/24/2022]
Abstract
A series of N-(4-hydroxy-3-methylsulfonanilidoethanol)arylglycinamides were prepared and evaluated for their human beta3 adrenergic receptor agonist activity. SAR studies led to the identification of BMS-201620 (39), a potent beta3 full agonist (Ki = 93 nM, 93% activation). Based on its favorable safety profile, BMS-201620 was chosen for clinical evaluation.
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Affiliation(s)
- W N Washburn
- Bristol-Myers Squibb Pharmaceutical Research Institute, PO Box 5400, Princeton, NJ 08543, USA.
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50
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Gavai AV, Sher PM, Mikkilineni AB, Poss KM, McCann PJ, Girotra RN, Fisher LG, Wu G, Bednarz MS, Mathur A, Wang TC, Sun CQ, Slusarchyk DA, Skwish S, Allen GT, Hillyer DE, Frohlich BH, Abboa-Offei BE, Cap M, Waldron TL, George RJ, Tesfamariam B, Harper TW, Ciosek CP, Young DA, Dickinson KE, Seymour AA, Arbeeny CM, Washburn WN. BMS-196085: a potent and selective full agonist of the human beta(3) adrenergic receptor. Bioorg Med Chem Lett 2001; 11:3041-4. [PMID: 11714606 DOI: 10.1016/s0960-894x(01)00629-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of 4-hydroxy-3-methylsulfonanilido-1,2-diarylethylamines were prepared and evaluated for their human beta(3) adrenergic receptor agonist activity. SAR studies led to the identification of BMS-196085 (25), a potent beta(3) full agonist (K(i)=21 nM, 95% activation) with partial agonist (45%) activity at the beta(1) receptor. Based on its desirable in vitro and in vivo properties, BMS-196085 was chosen for clinical evaluation.
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Affiliation(s)
- A V Gavai
- Bristol-Myers Squibb Pharmaceutical Research Institute, PO Box 4000, Princeton, NJ 08543-4000, USA.
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