1
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Ma YR, Lv XJ, Dong Q, Ming YC, Liu YK. Brønsted-Acid-Catalyzed In Situ Formation of Acyclic Tertiary Enamides and Its Application to the Preparation of Diverse Nitrogen-Containing Heterocyclic Compounds. Org Lett 2023; 25:5929-5934. [PMID: 37560944 DOI: 10.1021/acs.orglett.3c01919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
A Brønsted acid-catalyzed cascade process, involving in situ formation of acyclic tertiary enamides and intramolecular Michael reaction, is developed for the synthesis of functionalized cyclic tertiary enamides. Based on the dual reactivities of the enamide moiety, several reaction sequences were realized by using rationally designed substrates, leading to biologically relevant nitrogen-containing heterocyclic compounds with diverse structural skeletons in a concise and diastereocontrolled manner.
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Affiliation(s)
- Yuan-Ren Ma
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Xue-Jiao Lv
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Qing Dong
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Yong-Chao Ming
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Yan-Kai Liu
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
- Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
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2
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Ming YC, Lv XJ, Chen YH, Liu YK. Asymmetric iminium ion-catalyzed conjugate addition of 2-hydroxycinnamaldehydes and 2-oxocarboxylic esters: synthesis of chiral polysubstituted bridged bicyclic ketals. Chem Commun (Camb) 2023. [PMID: 37350153 DOI: 10.1039/d3cc02739b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/24/2023]
Abstract
A highly regio-, chemo-, and stereoselective cascade process initiated by enantioselective iminium-catalyzed conjugate addition of 2-hydroxycinnamaldehydes and 2-oxocarboxylic esters is presented. Normal cinnamaldehydes are not reactive under the same reaction conditions. Bridged bicyclic ketals rather than acetals bearing stereocenters on both the bridge carbon and bridgehead ketal carbon are synthesized.
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Affiliation(s)
- Yong-Chao Ming
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao, China.
| | - Xue-Jiao Lv
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao, China.
| | - Ying-Han Chen
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao, China.
| | - Yan-Kai Liu
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao, China.
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
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3
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Lu YX, Lv XJ, Liu C, Liu YK. Triethylamine-Promoted Henry Reaction/Elimination of HNO 2/Cyclization Sequence of Functionalized Nitroalkanes and 2-Oxoaldehydes: Diversity-Oriented Synthesis of Oxacycles. Org Lett 2023. [PMID: 37235554 DOI: 10.1021/acs.orglett.3c01158] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The triethylamine-promoted cascade Henry reaction/elimination of HNO2/cyclization reaction of 2-oxoaldehydes with nitroalkanes bearing various remote functionalities is described. Both chiral and achiral nitroalkanes were applicable to this protocol, leading to a variety of oxacycles, such as chromenes, chromanes, cyclic hemiacetals, and polycyclic acetals. An unexpected regioselective photooxygenation occurred without sensitizer during derivatization to convert a derived diene product into a dioxetane by reaction with singlet oxygen, which provided chromen-2-one and benzaldehyde after fragmentation.
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Affiliation(s)
- Yu-Xia Lu
- Molecular Synthesis Center and Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Xue-Jiao Lv
- Molecular Synthesis Center and Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Chang Liu
- Molecular Synthesis Center and Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Yan-Kai Liu
- Molecular Synthesis Center and Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
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4
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Liu JH, Lv XJ, Liu YK. Asymmetric Retro-Claisen Reaction Catalyzed by Chiral Aza-Bisoxazoline-Zn(II) Complex: Enantioselective Synthesis of α-Arylated Ketones. Org Lett 2023; 25:1706-1710. [PMID: 36881495 DOI: 10.1021/acs.orglett.3c00372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
Abstract
An asymmetric retro-Claisen reaction of α-monosubstituted β-diketones and quinones (or quinone imine) has been developed under the catalysis of a chiral aza-bisoxazoline-Zn(II) complex. The reaction proceeds via a sequence of conjugate addition, arylation, hemiketal anion-initiated C-C bond cleavage, and enantioselective protonation of enolate to provide various functionalized α-arylated ketones bearing a tertiary stereogenic center with high enantioselectivities. Notably, biologically important benzofuran and γ-butyrolactone derivatives could be synthesized by application of the developed protocol.
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Affiliation(s)
- Jia-Hui Liu
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Xue-Jiao Lv
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Yan-Kai Liu
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
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5
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Li YJ, Lv XJ, Liu YK. Enantioselective Michael Addition/Cyclization/Desymmetrization Sequence of Prochiral Cyclic Hemiacetals and Nitroolefins: Synthesis of Chiral Oxygen-Bridged Bicyclic Compounds. Org Lett 2022; 24:9254-9258. [PMID: 36512320 DOI: 10.1021/acs.orglett.2c03815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The organocatalytic enantioselective Michael addition of functionalized prochiral cyclic hemiacetals and nitroolefins has been developed under cooperative enamine and hydrogen bond catalysis. The obtained chiral hemiacetal intermediates could be used in the subsequent diastereocontrolled cyclization/desymmetrization divergent process to access (1) 9-oxabicyclo[3.3.1]nonane or 8-oxabicyclo[3.2.1]octane frameworks via oxocarbenium ion-mediated Friedel-Crafts cyclization, and (2) 2,9-dioxabicyclo[3.3.1]nonane frameworks via intramolecular nucleophilic cyclization. Experimental results suggest that there is neighboring group participation controlling the diastereoselectivities of the desymmetrization process.
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Affiliation(s)
- Yu-Jie Li
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Xue-Jiao Lv
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Yan-Kai Liu
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
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6
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Zhang XY, Li W, Zhang JR, Li CY, Zhang J, Lv XJ. Roles of sirtuin family members in chronic obstructive pulmonary disease. Respir Res 2022; 23:66. [PMID: 35313881 PMCID: PMC8939123 DOI: 10.1186/s12931-022-01986-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Accepted: 03/14/2022] [Indexed: 12/11/2022] Open
Abstract
The globally increasing annual incidence of chronic obstructive pulmonary disease (COPD), a common chronic disease, poses a serious risk to public health. Although the exact mechanism underlying the pathogenesis of COPD remains unclear, a large number of studies have shown that its pathophysiology and disease course are closely related to oxidative stress, inflammation, apoptosis, autophagy, and aging. The key players involved in COPD include the sirtuin family of NAD-dependent deacetylases that comprise seven members (SIRT1-7) in mammals. Sirtuins play an important role in metabolic diseases, cell cycle control, proliferation, apoptosis, and senescence. Owing to differences in subcellular localization, sirtuins exhibit anisotropy. In this narrative review, we discuss the roles and molecular pathways of each member of the sirtuin family involved in COPD to provide novel insights into the prevention and treatment of COPD and how sirtuins may serve as adjuvants for COPD treatment.
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Affiliation(s)
- Xi-Yue Zhang
- Department of Respiratory and Critical Care Medicine, The Second Hospital of Jilin University, Changchun, Jilin, China
| | - Wei Li
- Department of Respiratory and Critical Care Medicine, The Second Hospital of Jilin University, Changchun, Jilin, China
| | - Jin-Rong Zhang
- Department of Pathogeny Biology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, China
| | - Chun-Yan Li
- Department of Respiratory and Critical Care Medicine, The Second Hospital of Jilin University, Changchun, Jilin, China
| | - Jie Zhang
- Department of Respiratory and Critical Care Medicine, The Second Hospital of Jilin University, Changchun, Jilin, China.
| | - Xue-Jiao Lv
- Department of Respiratory and Critical Care Medicine, The Second Hospital of Jilin University, Changchun, Jilin, China.
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7
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Ming YC, Lv XJ, Liu M, Liu YK. Synthesis of Chiral Polycyclic Tetrahydrocarbazoles by Enantioselective Aminocatalytic Double Activation of 2-Hydroxycinnamaldehydes with Dienals. Org Lett 2021; 23:6515-6519. [PMID: 34374287 DOI: 10.1021/acs.orglett.1c02309] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient aminocatalytic enantioselective double-activation strategy has been developed that combines several different aminocatalytic modes in a cascade process, such as iminium ion, vinylogous iminium ion, trienamine, and dienamine activations. By using this strategy, 2-hydroxycinnamaldehydes worked well with various dienals via [4 + 2] cycloaddition and the oxa-Michael reaction-initiated cascade, respectively, leading to chiral polycyclic tetrahydrocarbazole and chromane derivatives with excellent diastereo- and enantioselectivities.
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Affiliation(s)
- Yong-Chao Ming
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Xue-Jiao Lv
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Ming Liu
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
| | - Yan-Kai Liu
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
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8
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Lv XJ, Ming YC, Wu HC, Liu YK. Brønsted acid-catalyzed dynamic kinetic resolution of in situ formed acyclic N,O-hemiaminals: cascade synthesis of chiral cyclic N,O-aminals. Org Chem Front 2021. [DOI: 10.1039/d1qo01135a] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A H2O controlled dynamic kinetic resolution was involved in a Brønsted acid-catalyzed acyclic N,O-hemiaminal formation/oxa-Michael reaction cascade, leading to highly enantioenriched cis-2,6-disubstituted tetrahydropyrans bearing an exo amide group.
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Affiliation(s)
- Xue-Jiao Lv
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Yong-Chao Ming
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Hui-Chun Wu
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Yan-Kai Liu
- Molecular Synthesis Center & Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
- Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao 266003, China
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9
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Pei JP, Lv XJ, Peng CJ, Liu YK. Asymmetric organocatalytic multicomponent reactions for efficient construction of bicyclic compounds bearing bisacetal and isoxazolidine moieties. Chem Commun (Camb) 2020; 56:12765-12768. [PMID: 32966389 DOI: 10.1039/d0cc05099g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An organocatalytic multicomponent reaction of N-protected hydroxylamines, acrylaldehyde and acetal-containing enones was developed. Bisacetal-containing bicyclic isoxazolidine derivatives bearing four continuous stereocenters were formed with excellent stereoselectivities. A plausible reaction pathway was proposed based on 18O-labeling control experiments.
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Affiliation(s)
- Jun-Ping Pei
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.
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10
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Tan WX, Lv XJ, Yang RQ, Zhao BZ, Chen JY, Wu S, Zhao YH, Cui MH. Spontaneous rupture of an unscarred uterus with an intact amniotic sac extrusion and fetal leg entrapment at 28 gestational weeks: a case report. Gland Surg 2020; 9:459-462. [PMID: 32420274 DOI: 10.21037/gs.2020.02.16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The spontaneous rupture of an unscarred uterus at 28 gestational weeks is an extremely rare event, particularly when associated with an intact amniotic sac extrusion and fetal leg entrapment, which has not been previously reported. A 27-year-old primigravid woman was referred to our department, due to perpetual abdominal pain, at 28 weeks and 5 days of gestation. The patient, G3p0, had previously undergone two induced abortions. At the time of admission, abdominal ultrasonography suggested a defect in the left uterine horn. An emergency laparotomy was subsequently performed and revealed an intact amniotic sac extrusion and fetal leg entrapment. Considering the risk of placental abruption, and the possibility of a secondary rupture if the gestation was not terminated, an emergency Cesarean section was recommended. Uterine rupture may be suspected whenever a patient complains of durative abdominal pain at 28 weeks and 5 days of gestation, even in the absence of an intra-abdominal hemorrhage or vaginal bleeding.
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Affiliation(s)
- Wen-Xi Tan
- Department of Obstetrics and Gynecology, The Second Hospital of Jilin University, Changchun 130041, China
| | - Xue-Jiao Lv
- Department of Respiratory, The Second Hospital of Jilin University, Changchun 130041, China
| | - Rui-Qi Yang
- Department of Obstetrics and Gynecology, The Second Hospital of Jilin University, Changchun 130041, China
| | - Ben-Zheng Zhao
- Department of Obstetrics and Gynecology, The Second Hospital of Jilin University, Changchun 130041, China
| | - Jun-Yu Chen
- Department of Obstetrics and Gynecology, The Second Hospital of Jilin University, Changchun 130041, China
| | - Shan Wu
- Department of Obstetrics and Gynecology, The Second Hospital of Jilin University, Changchun 130041, China
| | - Yan-Hui Zhao
- Department of Obstetrics and Gynecology, The Second Hospital of Jilin University, Changchun 130041, China
| | - Man-Hua Cui
- Department of Obstetrics and Gynecology, The Second Hospital of Jilin University, Changchun 130041, China
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11
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Zhang XQ, Lv XJ, Pei JP, Tan R, Liu YK. An asymmetric multicatalytic reaction sequence of 2-hydroxycinnamaldehydes and enolic 1,3-dicarbonyl compounds to construct bridged bicyclic acetals. Org Chem Front 2020. [DOI: 10.1039/c9qo01272a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
2-Hydroxycinnamaldehydes and cyclic 1,3-dicarbonyl nucleophiles were used in an asymmetric organocatalyzed reaction sequence to construct bridged bicyclic acetals via a multicatalytic process involving iminium catalysis and anion-binding catalysis.
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Affiliation(s)
- Xiao-Qian Zhang
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Xue-Jiao Lv
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Jun-Ping Pei
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Rui Tan
- School of Life Science and Engineering
- Southwest Jiaotong University
- Chengdu
- China
| | - Yan-Kai Liu
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
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12
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Tan WX, Xu TM, Zhou ZL, Lv XJ, Liu J, Zhang WJ, Cui MH. TRP14 promotes resistance to cisplatin by inducing autophagy in ovarian cancer. Oncol Rep 2019; 42:1343-1354. [PMID: 31524236 PMCID: PMC6718101 DOI: 10.3892/or.2019.7258] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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: 01/29/2019] [Accepted: 07/03/2019] [Indexed: 11/05/2022] Open
Abstract
Cisplatin is a common chemotherapeutic agent against ovarian cancer; however, drug resistance is a major limiting factor for its use in clinical treatment. The underlying mechanisms of cisplatin resistance in ovarian cancer have not yet been fully elucidated. Thus, this study aimed to elucidate some of the mechanisms responsible for resistance to cisplatin in ovarian cancer. The results demonstrated that the cisplatin‑resistant human ovarian cancer cell lines, SKOV3/DDP and A2780/DDP, exhibited higher autophagy levels than the control ovarian cancer cell lines, SKOV3 and A2780. Moreover, autophagy inhibition by 3‑methyladenine or shRNA against autophagy‑related gene (ATG)5 potentiated the cytotoxicity induced by cisplatin, whereas autophagy induction by rapamycin (Rapa) increased cell survival. Exposure to cisplatin induced an upregulation in the expression of thioredoxin‑related protein of 14 kDa (TRP14). Furthermore, TRP14 knockdown or overexpression decreased or increased the autophagy response and cisplatin resistance, and this effect was reversed by treatment with Rapa or ATG5 knockdown. The findings of this study also suggested that TRP14 induced autophagy and chemoresistance via the 5'AMP‑activated protein kinase (AMPK)/mammalian target of rapamycin (mTOR)/p70S6K signaling pathway. Importantly, the data from a tissue array revealed a positive association between TRP14 and Beclin1 in human ovarian cancer and marginal tissues. These findings have identified, for the first time, to the best of our knowledge, that TRP14 induces autophagy and consequently cisplatin resistance in ovarian cancer cells via the AMPK/mTOR/p70S6K signaling pathway. This in turn renders TRP14 as a potential predictor or target in ovarian cancer therapy.
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Affiliation(s)
- Wen-Xi Tan
- Department of Obstetrics and Gynecology, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
| | - Tian-Min Xu
- Department of Obstetrics and Gynecology, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
| | - Zi-Long Zhou
- National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun, Jilin 130024, P.R. China
| | - Xue-Jiao Lv
- Department of Respiratory Medicine, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
| | - Jian Liu
- Department of Obstetrics and Gynecology, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
| | - Wen-Jing Zhang
- Department of Clinical Laboratory, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China
| | - Man-Hua Cui
- Department of Obstetrics and Gynecology, The Second Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
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13
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Chen YH, Lv XJ, You ZH, Liu YK. Asymmetric Organocatalyzed Reaction Sequence To Synthesize Chiral Bridged and Spiro-Bridged Benzofused Aminals via Divergent Pathways. Org Lett 2019; 21:5556-5561. [PMID: 31244090 DOI: 10.1021/acs.orglett.9b01874] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A highly efficient asymmetric organocatalysis-triggered reaction sequence is developed. 2-Hydroxy cinnamaldehydes and cyclic N-sulfonyl ketimines were both used as multisite substrates (more than two reactive sites) to access structurally diverse chiral bridged and spiro-bridged benzofused aminal derivatives, where an inseparable equilibrating mixture of isomers can be regioselectively converted into bridged benzofused aminals with different ring connectivities via divergent pathways. Several stereoselective transformations of the resulted bridged aminals are presented.
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Affiliation(s)
- Ying-Han Chen
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Qingdao 266003 , China
| | - Xue-Jiao Lv
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Qingdao 266003 , China
| | - Zhi-Hao You
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Qingdao 266003 , China
| | - Yan-Kai Liu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Qingdao 266003 , China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology , Qingdao 266003 , China
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14
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Lv XJ, Zhao WW, Chen YH, Wan SB, Liu YK. Organocatalytic asymmetric synthesis of both cis- and trans-configured pyrano[2,3-b]chromenes via different dehydration pathways. Org Chem Front 2019. [DOI: 10.1039/c9qo00366e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [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
The enamine-catalyzed [3 + 3]-cycloaddition between chroman-2-ols and β,γ-unsaturated α-ketoesters is developed to access both enantiomers of cis- and trans-fused pyrano[2,3-b]chromene derivatives.
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Affiliation(s)
- Xue-Jiao Lv
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Wei-Wei Zhao
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Ying-Han Chen
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Sheng-Biao Wan
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Yan-Kai Liu
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
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15
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Chen YH, Lv XJ, You ZH, Liu YK. Asymmetric organocatalyzed reaction sequence of 2-hydroxy cinnamaldehydes and acyclic N-sulfonyl ketimines to construct diverse chiral bridged polycyclic aminals. Org Chem Front 2019. [DOI: 10.1039/c9qo01116a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
2-Hydroxy cinnamaldehydes and acyclic N-sulfonyl ketimines were used as multisite substrates in an iminium catalysis triggered sequential process, leading to diverse chiral bridged polycyclic aminals in a highly regio- and stereoselective manner.
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Affiliation(s)
- Ying-Han Chen
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Xue-Jiao Lv
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Zhi-Hao You
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
| | - Yan-Kai Liu
- Key Laboratory of Marine Drugs
- Chinese Ministry of Education
- School of Medicine and Pharmacy
- Ocean University of China
- Qingdao 266003
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16
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Lv XJ, Chen YH, Liu YK. Two Competitive but Switchable Organocatalytic Cascade Reaction Pathways: The Diversified Synthesis of Chiral Acetal-Containing Bridged Cyclic Compounds. Org Lett 2018; 21:190-195. [PMID: 30576161 DOI: 10.1021/acs.orglett.8b03654] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The organocatalytic enantioselective synthesis of methanobenzodioxepine derivatives bearing a 6,6,5-bridged ring system is presented. The m-CPBA-triggered in situ α-oxidation of β-oxoesters to provide the required but unstable α-hydroxy-β-dicarbonyl substrates is the key to this three-step sequence, providing the desired cyclic acetals with excellent stereoselectivities containing two bridgehead and one fully substituted stereocenters. It is noteworthy that the absence of m-CPBA furnished the acetal products bearing a 6,6,6-bridged ring system with similar good results from the same starting materials.
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Affiliation(s)
- Xue-Jiao Lv
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Qingdao 266003 , China
| | - Ying-Han Chen
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Qingdao 266003 , China
| | - Yan-Kai Liu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy , Ocean University of China , Qingdao 266003 , China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology , Qingdao 266003 , China
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17
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Lv XJ, Du YW, Hao YQ, Su ZZ, Zhang L, Zhao LJ, Zhang J. RNA-binding motif protein 5 inhibits the proliferation of cigarette smoke-transformed BEAS-2B cells through cell cycle arrest and apoptosis. Oncol Rep 2016; 35:2315-27. [PMID: 26782095 DOI: 10.3892/or.2016.4551] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 12/11/2015] [Indexed: 11/06/2022] Open
Abstract
Cigarette smoking has been shown to be the most significant risk factor for lung cancer. Recent studies have also indicated that RNA-binding motif protein 5 (RBM5) can modulate apoptosis and suppress tumor growth. The present study focused on the role of RBM5 in the regulation of cigarette smoke extract (CSE)-induced transformation of bronchial epithelial cells into the cancerous phenotype and its mechanism of action. Herein, we exposed normal BEAS-2B cells for 8 days to varying concentrations of CSE or dimethylsulfoxide (DMSO), followed by a recovery period of 2 weeks. Next, the RBM5 protein was overexpressed in these transformed BEAS-2B cells though lentiviral infection. Later, the morphological changes, cell proliferation, cell cycle, apoptosis, invasion and migration were assessed. In addition, we analyzed the role of RBM5 in xenograft growth. The expression of RBM5 along with the genes related to cell cycle regulation, apoptosis and invasion were also examined. Finally, our results revealed that BEAS-2B cells exposed to 100 µg/ml CSE acquired phenotypic changes and formed tumors in nude mice, indicative of their cancerous transformation and had reduced RBM5 expression. Subsequent overexpression of RBM5 in these cells significantly inhibited their proliferation, induced G1/S arrest, triggered apoptosis and inhibited their invasion and migration, including xenograft growth. Thus, we established an in vitro model of CSE-induced cancerous transformation and concluded that RBM5 overexpression inhibited the growth of these transformed cells through cell cycle arrest and induction of apoptosis. Therefore, our study suggests the importance of RBM5 in the pathogenesis of smoking-related cancer.
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Affiliation(s)
- Xue-Jiao Lv
- Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
| | - Yan-Wei Du
- Department of Pathology, College of Basic Medicine, Changchun University of Chinese Medicine, Changchun, Jilin 130117, P.R. China
| | - Yu-Qiu Hao
- Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
| | - Zhen-Zhong Su
- Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
| | - Lin Zhang
- Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
| | - Li-Jing Zhao
- Department of Pathophysiology, College of Basic Medicine, Jilin University, Changchun, Jilin 130021, P.R. China
| | - Jie Zhang
- Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, Changchun, Jilin 130041, P.R. China
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18
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Hao YQ, Su ZZ, Lv XJ, Li P, Gao P, Wang C, Bai Y, Zhang J. RNA-binding motif protein 5 negatively regulates the activity of Wnt/β-catenin signaling in cigarette smoke-induced alveolar epithelial injury. Oncol Rep 2015; 33:2438-44. [PMID: 25738917 DOI: 10.3892/or.2015.3828] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 02/17/2015] [Indexed: 11/06/2022] Open
Abstract
Cigarette smoking is closely associated with various respiratory diseases. Oxidants and carcinogens in cigarettes are reported to induce various airway epithelial injuries. However, the underlying mechanisms remain unclear. The aims of the present study were to determine the involvement of RNA-binding motif protein 5 (RBM5) and Wnt/β-catenin signaling in cigarette smoke-induced alveolar epithelial injury, as well as the interaction between both. A549 cells were treated with cigarette smoke extract (CSE). The MTT assay was used to assess the effects of CSE on cell viability. The levels of RBM5 and Wnt/β-catenin/GSK3β were detected by semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR) and western blot analysis. A luciferase assay was used to assess the activity of β-catenin/T-cell factor (TCF) signaling. The results revealed that CSE inhibited A549 cell viability in both a dose- and time-dependent manner. Cytosolic and nuclear β-catenin levels were significantly increased following CSE treatment, compared with those in the control cells (P<0.05). The luciferase activity in CSE-exposed cells transfected with the TCF luciferase reporter wild-type plasmid (pGL3-OT) was significantly greater than that in cells without CSE exposure (33,167±3,085 vs. 19,978±1,916, respectively, P<0.05). Both the mRNA and protein levels of RBM5 in the CSE-treated cells were significantly reduced compared to the levels in the controls (all P<0.05). The overexpression of RBM5 inhibited Wnt/β-catenin signaling in the A549 cells, while silencing of RBM5 enhanced Wnt/β-catenin signaling. The β-catenin/TCF signaling inhibitor ICG-001 had no apparent effect on the RBM5 levels. Downregulation of RBM5 and activation of Wnt/β-catenin signaling are involved in CSE-induced alveolar epithelial injury. RBM5 acts as an upstream molecule that negatively regulates the activity of Wnt/β-catenin signaling.
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Affiliation(s)
- Yu-Qiu Hao
- Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, Chuangchun, Jilin 130041, P.R. China
| | - Zhen-Zhong Su
- Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, Chuangchun, Jilin 130041, P.R. China
| | - Xue-Jiao Lv
- Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, Chuangchun, Jilin 130041, P.R. China
| | - Ping Li
- Department of Paediatrics, The Second Affiliated Hospital of Jilin University, Chuangchun, Jilin 130041, P.R. China
| | - Peng Gao
- Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, Chuangchun, Jilin 130041, P.R. China
| | - Chen Wang
- Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, Chuangchun, Jilin 130041, P.R. China
| | - Yue Bai
- Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, Chuangchun, Jilin 130041, P.R. China
| | - Jie Zhang
- Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, Chuangchun, Jilin 130041, P.R. China
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19
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Abstract
A 56-year-old man presented with fevers up to 40°C and acute pain in the left upper quadrant. Full blood count was normal and biochemical tests revealed increased serum globulin. Abdominal ultrasound revealed hepatomegaly and splenomegaly with multiple enlarged lymph nodes in the neck, axilla, and inguinal regions. The bone marrow smear was negative. Splenectomy was performed and the pathology revealed splenic ischemic infarcts. Biopsy of one of the axillary lymph nodes revealed macrophages filled with leishmanias. The patient tested positive by the rk39 dipstick test. He was treated with sodium stibogluconate and showed full recovery.
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Affiliation(s)
- Z Z Liu
- Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu, China
| | - X J Lv
- Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu, China
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20
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Cheng H, Jiang XD, Hu XP, Zhong ML, Lv XJ, Zhu SN. Diode-pumped 1988-nm Tm:YAP laser mode-locked by intracavity second-harmonic generation in periodically poled LiNbO₃. Opt Lett 2014; 39:2187-2190. [PMID: 24686707 DOI: 10.1364/ol.39.002187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report a diode-pumped intracavity second-harmonic generation mode-locked solid-state Tm:YAP laser operating at 1988 nm using a periodically poled congruent LiNbO3 as the nonlinear crystal. The threshold of continuous wave mode locking is 11.6 W. The maximum output power is 1.67 W, while the shortest pulse obtained is 4.7 ps at a repetition rate of 97.09 MHz.
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21
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Lv XJ, Sun JW, Hu B, Ouyang M, Fu ZY, Wang PJ, Bian GF, Zhang C. Effective process to achieve enhanced electrochromic performances based on poly(4,4',4″-tris[4-(2-bithienyl)pheny]amine)/ZnO nanorod composites. Nanotechnology 2013; 24:265705. [PMID: 23735932 DOI: 10.1088/0957-4484/24/26/265705] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Poly(4,4',4″-tris[4-(2-bithienyl)pheny]amine) (PTBTPA) was electrochemically synthesized on a ZnO-coated ITO electrode to form a PTBTPA/ZnO nanocomposite electrode. The composite film exhibited a noticeable electrochromism, with reversible color changes from orange in the reduced state (0 V), olive green in the middle state (0.9 V) to dark gray in the oxidized state (1.2 V). Furthermore, the composite film showed a fast switching time of 0.92 s and a high optical contrast of 65% at 1100 nm, and retained 97% of its original electroactivity after 500 cycles, while PTBTPA film had switching time of 1.63 s and an optical contrast of 52% at 1100 nm, and retained 75% of its original electroactivity. The results demonstrated that the electrochromic performances were significantly enhanced through incorporating PTBTPA with ZnO nanorods. ZnO nanorods were introduced to modify the structure of the electrode: on one hand, to offer a directional attraction for the counterions, and on the other hand, to enhance the adhesion between the polymer and the ITO electrode. Accordingly, a conducting polymer/inorganic nanocomposite system could improve the polymer's electrochromic performance, especially in terms of the switching speed and long-term stability of the electrochromic materials.
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Affiliation(s)
- X J Lv
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou, People's Republic of China
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22
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Abstract
Since cavity-phase matching has been experimentally realized, the efficiency is limited to 20%. In this Letter, we successfully achieved a conversion efficiency as high as 41% with a slope efficiency of 48.5% using cavity-phase matching, by reflecting the pump beam at the end surface of the KTiOPO(4) crystal. The high performance of the device makes it a promising candidate to substitute for quasi-phase-matching material.
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Affiliation(s)
- H B Lin
- OPERA–Photonique, CP 194/5, Université Libre de Bruxelles, av FD Roosevelt 50, Brussels B-1050, Belgium.
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23
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Liu YH, Xie ZD, Ling W, Yuan Y, Lv XJ, Lu J, Hu XP, Zhao G, Zhu SN. Efficiency-enhanced optical parametric down conversion for mid-infrared generation on a tandem periodically poled MgO-doped stoichiometric lithium tantalate chip. Opt Express 2011; 19:17500-17505. [PMID: 21935116 DOI: 10.1364/oe.19.017500] [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: 05/31/2023]
Abstract
We report an efficiency-enhanced mid-infrared generation via optical parametric down conversion. A tandem periodically-poled MgO-doped stoichiometric lithium tantalate crystal is used to realize on-chip generation and amplification of mid-infrared radiation inside an optical parametric oscillator cavity. We achieved 21.2% conversion efficiency (24% slope efficiency), which is among the highest efficiencies for the pump-to-mid-infrared conversion, with 1064 nm Nd class laser pump. The maximum average output power at 3.87 μm reached 635 mW with a 3.0 W pump.
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Affiliation(s)
- Y H Liu
- National Laboratory of Solid State Microstructures, College of Physics, Nanjing University, Nanjing, China
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24
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Liu YH, Xie ZD, Ling W, Lv XJ, Zhu SN. Generation of a twin beam at the cesium line and telecom wavelength by cavity phase matching. Opt Lett 2011; 36:3139-3141. [PMID: 21847186 DOI: 10.1364/ol.36.003139] [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: 05/31/2023]
Abstract
Cavity phase matching has been recently demonstrated as a phase-matching method for efficient nonlinear frequency conversion in a microcavity. Here we extend it to the Type I configuration using a sub-coherent-length optical parametric oscillator consisting of an MgO-doped lithium niobate crystal sheet. It generates a tunable single-longitudinal-mode twin beam, which covers the cesium D2 line of 852.1 nm and the extended band of optical communication. This microcavity is capable of peak output power of 58 kW with a maximum conversion efficiency of 18.5%. Broad applications in the areas of light-atom interaction, spectroscopy, optical telecommunication, and quantum optics can be expected.
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Affiliation(s)
- Y H Liu
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, China
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25
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Liu YH, Xie ZD, Pan SD, Lv XJ, Yuan Y, Hu XP, Lu J, Zhao LN, Chen CD, Zhao G, Zhu SN. Diode-pumped passively mode-locked Nd:YVO4 laser at 1342 nm with periodically poled LiNbO3. Opt Lett 2011; 36:698-700. [PMID: 21368953 DOI: 10.1364/ol.36.000698] [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: 05/30/2023]
Abstract
In this Letter, we demonstrate a nonlinear-mirror (NLM) mode-locked diode-pumped solid-state Nd:YVO4 laser operating at 1342 nm, in which the NLM comprises a periodically poled LiNbO3 crystal and a dichroic mirror. The self-starting threshold for cw mode locking is 1.5 W, which is significantly lower than that of saturable absorber mode locking. An average power of 1.52 W at 1342 nm is obtained under diode pump power of 10 W at 808 nm, with the slope efficiency being up to 16.8%. The pulse width and the repetition rate of the mode-locked laser output are about 9.5 ps and 101 MHz, respectively.
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Affiliation(s)
- Y H Liu
- National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing, China
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26
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Xie ZD, Lv XJ, Liu YH, Ling W, Wang ZL, Fan YX, Zhu SN. Cavity phase matching via an optical parametric oscillator consisting of a dielectric nonlinear crystal sheet. Phys Rev Lett 2011; 106:083901. [PMID: 21405572 DOI: 10.1103/physrevlett.106.083901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Indexed: 05/22/2023]
Abstract
We experimentally demonstrate cavity phase matching for the first time using a sheet optical parametric oscillator which is made of an x-cut KTiOPO(4) crystal sheet. This microcavity presents 220 kW peak power capability for near-frequency-degenerate parametric outputs with up to 23.8% slope efficiency. It also features unique spectral characteristics such as single-longitudinal-mode and narrow linewidth. These attractive properties predict broad applications of such a mini-device, such as terahertz generation, photonic integration, spectroscopy, and quantum information, etc.
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Affiliation(s)
- Z D Xie
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
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27
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Lv XJ, Lu J, Xie ZD, Yang J, Zhao G, Xu P, Qin YQ, Zhu SN. Polarization-free second-order nonlinear frequency conversion using the optical superlattice. Opt Lett 2011; 36:7-9. [PMID: 21209669 DOI: 10.1364/ol.36.000007] [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: 05/30/2023]
Abstract
We propose a universal and practical scheme to realize polarization-free second-order nonlinear frequency-conversion processes, including sum-frequency generation, difference-frequency generation, and optical parametric amplification. This scheme is based on the optical superlattice with a noncritical phase-matching condition, which is suitable for optical integration. A chirped dual-period structure is proposed to ensure the efficiency and stability of the conversions.
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Affiliation(s)
- X J Lv
- National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, China
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28
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Yang J, Hu XP, Xu P, Lv XJ, Zhang C, Zhao G, Zhou HJ, Zhu SN. Chirped-quasi-periodic structure for quasi-phase-matching. Opt Express 2010; 18:14717-14723. [PMID: 20639957 DOI: 10.1364/oe.18.014717] [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: 05/29/2023]
Abstract
We propose in this paper a chirped-quasi-periodic structure using the projection method. This type of new structure combines the advantages of chirped and quasi-periodic structures, and can be used for both multiple quasi-phase-matching and multiple bandwidths control. Numerical simulation of second-harmonic generation performance is in good agreement with the Fourier spectrum of the structure.
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Affiliation(s)
- J Yang
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
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29
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Zhao LN, Su J, Hu XP, Lv XJ, Xie ZD, Zhao G, Xu P, Zhu SN. Single-pass sum-frequency-generation of 589-nm yellow light based on dual-wavelength Nd:YAG laser with periodically-poled LiTaO(3) crystal. Opt Express 2010; 18:13331-13336. [PMID: 20588462 DOI: 10.1364/oe.18.013331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We demonstrate a compact all-solid-state yellow laser source based on Q-switched dual-wavelength Nd:YAG laser and periodically-poled LiTaO(3) crystal. 589-nm yellow light was generated by single-pass sum-frequency generation of the fundamental IR waves at 1064 and 1319 nm. The maximum output power of yellow light was 506 mW and the corresponding conversion efficiency was approximately 5.5% [W(-1)cm(-1)].
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Affiliation(s)
- L N Zhao
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, People's Republic of China
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30
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Lv XJ, Zhao LN, Lu J, Zhao G, Liu H, Qin YQ, Zhu SN. Poling quality evaluation of optical superlattice using 2D Fourier transform method. Opt Express 2009; 17:18241-18249. [PMID: 19907615 DOI: 10.1364/oe.17.018241] [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: 05/28/2023]
Abstract
In this article we develop a method to evaluate the poling quality of optical superlattice (OSL) based on two-dimensional (2D) Fourier transform. To demonstrate this method, -Z or +Z face etched OSL samples with desired patterns are fabricated by standard electric field poling technique. By analyzing the processed micrograph of the etched surfaces, the magnitude of the reciprocal vectors of the OSL are calculated directly and rapidly. Second harmonic generation (SHG) experiment is performed to validate the evaluation result.
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Affiliation(s)
- X J Lv
- National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, People's Republic of China
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31
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Xu P, Zhao LN, Lv XJ, Lu J, Yuan Y, Zhao G, Zhu SN. Compact high-power red-green-blue laser light source generation from a single lithium tantalate with cascaded domain modulation. Opt Express 2009; 17:9509-9514. [PMID: 19506598 DOI: 10.1364/oe.17.009509] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
1W quasi-white-light source has been generated from a single lithium tantalate with cascaded domain modulation. The quasi-white-light is combined by proper proportion of the red, green and blue laser light. The red and the blue result from a compact self-sum frequency optical parametric oscillation when pumped by a single green laser. The efficiency of quasi-white-light from the green pump reaches 27%. This compact design can be employed not only as a stable and powerful RGB light source but also an effective blue laser generator.
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Affiliation(s)
- P Xu
- National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, People's Republic of China.
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32
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Xu P, Wang JF, Li C, Xie ZD, Lv XJ, Leng HY, Zhao JS, Zhu SN. Simultaneous optical parametric oscillation and intracavity second-harmonic generation based on a hexagonally poled lithium tantalate. Opt Express 2009; 17:4289-4294. [PMID: 19293853 DOI: 10.1364/oe.17.004289] [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: 05/27/2023]
Abstract
Simultaneous optical parametric oscillation and intracavity second-harmonic generation based on a hexagonally poled lithium tantalate is reported. Both the optical parametric oscillation and the cascaded noncollinear second-order harmonic generation processes reach a high efficiency. A variety of possible self-doubling optical parametric oscillation processes indicate this hexagonally poled lithium tantalate has potential applications as a compact multi-wavelength light source.
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Affiliation(s)
- P Xu
- National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China.
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33
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Pan SD, Yuan Y, Zhao LN, Lv XJ, Zhu SN. Experimental realization of broadband parametric generation in a quasi-periodically poled LiTaO3. Opt Express 2008; 16:18616-18623. [PMID: 19581947 DOI: 10.1364/oe.16.018616] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have achieved broadband parametric generation by using a quasi-periodically poled LiTaO(3) crystal as frequency converter. Tuning wavelength rang from 0.609 microm to 5.208 microm, which covered three quasi-phase-matching processes, was obtained by means of changing the pump wavelength from 0.530 microm to 1.184 microm. The experiment results are in good agreement with theory. The maximum conversion efficiency is 62% with a 10 Hz-5 ns pump source, at the average pump power of 0.5 mW. Our results exhibit a possible application of quasi-periodic superlattice in laser technology.
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Affiliation(s)
- S D Pan
- National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, People's Republic of China
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34
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Wu J, Jiao YH, Jin P, Lv XJ, Wang ZG. Effect of the growth mode on the two- to three-dimensional transition of InAs grown on vicinal GaAs(001) substrates. Nanotechnology 2007; 18:265304. [PMID: 21730398 DOI: 10.1088/0957-4484/18/26/265304] [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: 05/31/2023]
Abstract
Some differences were observed between conventional molecular-beam epitaxy (MBE) and mobility enhanced epitaxy (MEE) of InAs on a vicinal GaAs(001) substrate in the variation of the number density N of the InAs islands, with additional InAs coverage (θ-θ(c)) after the critical InAs coverage θ(c) during the two- to three-dimensional (2D-3D) transition. For MBE the variation was consistent with the power law N(θ)∼(θ-θ(c))(α); while for MEE, the linear relation [Formula: see text] was observed. The difference is discussed in terms of the randomness in the nucleation of the InAs islands.
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Affiliation(s)
- J Wu
- Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083, People's Republic of China
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Xia PY, Feng P, Zhong L, Lv XJ, Lei BJ. Accumulation of ofloxacin and tosufloxacin in fluoroquinolone-resistant E coli. Acta Pharmacol Sin 2001; 22:210-4. [PMID: 11742566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023] Open
Abstract
AIM To make sure whether there is a difference in mechanism existed in the resistant E coli strains accumulated hydrophilic fluoroquinolone ofloxacin and hydrophobic fluoroquinoline tosufloxacin. METHODS Fluoroquinolone accumulation in bacteria and effect of active efflux were measured by fluorescence method. Analysis of outer membrane proteins was made by SDS-PAGE. E coli strains included JF701 and JF703 that are OmpC- or OmpF-deficient mutants of E coli K-12 respectively, and the susceptible strain Ecs and its in-vitro selected resistant strains R2, R256, and clinical resistant isolates R5, R6. RESULTS Ecs accumulated ofloxacin almost at the same concentration as JF701, but JF703 did about 1/2 of that lower than JF701. However, four resistant strains accumulated ofloxacin about 5 to 7-fold lower than those susceptible strains. On the other hand, there was no significant difference for the accumulation of tosufloxacin between fluoroquinolone-resistant and -susceptible strains. After addition of proton ionophore DNP for 5 min and 10 min, the accumulation of tosufloxacin slowly decreased in E coli strains, whereas the accumulation of ofloxacin was increased, especially in the resistant strains. A good relevance exists between the accumulation increment of ofloxacin and its MIC for each E coli strain after addition of DNP for 5 min and 10 min (r=0.9623 and 0.8006 respectively). Furthermore, both OmpF and OmpC in Ecs, OmpF-deficiency in R2, R256 and OmpC-deficiency in R5, R6 were observed. CONCLUSION The accumulation of ofloxacin other than tosufloxacin could be reduced by OmpF-deficiency and active efflux, and the latter may be an important factor in the development of resistance to hydrophilic fluoroquinolone in E coli.
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Affiliation(s)
- P Y Xia
- Department of Infectious Diseases, the First Affiliated Hospital, West China University of Medical Sciences, Chengdu 610041, China.
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