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Qi Q, Jiang Y, Zhou X, Lü Y, Xiao R, Bai J, Lou H, Sun W, Lian Y, Hao N, Li M, Chang J. Whole-genome sequencing analysis in fetal structural anomalies: novel phenotype-genotype discoveries. Ultrasound Obstet Gynecol 2024; 63:664-671. [PMID: 37842862 DOI: 10.1002/uog.27517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 09/28/2023] [Accepted: 10/03/2023] [Indexed: 10/17/2023]
Abstract
OBJECTIVES The identification of structural variants and single-nucleotide variants is essential in finding molecular etiologies of monogenic genetic disorders. Whole-genome sequencing (WGS) is becoming more widespread in genetic disease diagnosis. However, data on its clinical utility remain limited in prenatal practice. We aimed to expand our understanding of implementing WGS in the genetic diagnosis of fetal structural anomalies. METHODS We employed trio WGS with a minimum coverage of 40× on the MGI DNBSEQ-T7 platform in a cohort of 17 fetuses presenting with aberrations detected by ultrasound, but uninformative findings of standard chromosomal microarray analysis (CMA) and exome sequencing (ES). RESULTS Causative genetic variants were identified in two families, with an increased diagnostic yield of 11.8% (2/17). Both were exon-level copy-number variants of small size (3.03 kb and 5.16 kb) and beyond the detection thresholds of CMA and ES. Moreover, to the best of our knowledge, we have described the first prenatal instance of the association of FGF8 with holoprosencephaly and facial deformities. CONCLUSIONS Our analysis demonstrates the clinical value of WGS in the diagnosis of the underlying etiology of fetuses with structural abnormalities, when routine genetic tests have failed to provide a diagnosis. Additionally, the novel variants and new fetal manifestations have expanded the mutational and phenotypic spectrums of BBS9 and FGF8. © 2023 International Society of Ultrasound in Obstetrics and Gynecology.
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Affiliation(s)
- Q Qi
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, China
| | - Y Jiang
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, China
| | - X Zhou
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, China
| | - Y Lü
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, China
| | - R Xiao
- National Engineering Laboratory for Key Technology of Birth Defect Control and Prevention, Screening and Diagnostic R&D Center, Zhejiang, China
| | - J Bai
- Becreative Lab Co. Ltd, Beijing, China
| | - H Lou
- Becreative Lab Co. Ltd, Beijing, China
| | - W Sun
- Biosan Biochemical Technologies Co. Ltd., Zhejiang, China
| | - Y Lian
- Biosan Biochemical Technologies Co. Ltd., Zhejiang, China
| | - N Hao
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, China
| | - M Li
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, China
| | - J Chang
- Department of Medical Research Center, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, China
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Allerton CMN, Arcari JT, Aschenbrenner LM, Avery M, Bechle BM, Behzadi MA, Boras B, Buzon LM, Cardin RD, Catlin NR, Carlo AA, Coffman KJ, Dantonio A, Di L, Eng H, Farley KA, Ferre RA, Gernhardt SS, Gibson SA, Greasley SE, Greenfield SR, Hurst BL, Kalgutkar AS, Kimoto E, Lanyon LF, Lovett GH, Lian Y, Liu W, Martínez Alsina LA, Noell S, Obach RS, Owen DR, Patel NC, Rai DK, Reese MR, Rothan HA, Sakata S, Sammons MF, Sathish JG, Sharma R, Steppan CM, Tuttle JB, Verhoest PR, Wei L, Yang Q, Yurgelonis I, Zhu Y. A Second-Generation Oral SARS-CoV-2 Main Protease Inhibitor Clinical Candidate for the Treatment of COVID-19. J Med Chem 2024. [PMID: 38687966 DOI: 10.1021/acs.jmedchem.3c02469] [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: 05/02/2024]
Abstract
Despite the record-breaking discovery, development and approval of vaccines and antiviral therapeutics such as Paxlovid, coronavirus disease 2019 (COVID-19) remained the fourth leading cause of death in the world and third highest in the United States in 2022. Here, we report the discovery and characterization of PF-07817883, a second-generation, orally bioavailable, SARS-CoV-2 main protease inhibitor with improved metabolic stability versus nirmatrelvir, the antiviral component of the ritonavir-boosted therapy Paxlovid. We demonstrate the in vitro pan-human coronavirus antiviral activity and off-target selectivity profile of PF-07817883. PF-07817883 also demonstrated oral efficacy in a mouse-adapted SARS-CoV-2 model at plasma concentrations equivalent to nirmatrelvir. The preclinical in vivo pharmacokinetics and metabolism studies in human matrices are suggestive of improved oral pharmacokinetics for PF-07817883 in humans, relative to nirmatrelvir. In vitro inhibition/induction studies against major human drug metabolizing enzymes/transporters suggest a low potential for perpetrator drug-drug interactions upon single-agent use of PF-07817883.
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Affiliation(s)
| | - Joel T Arcari
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | | | - Melissa Avery
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Bruce M Bechle
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | | | - Britton Boras
- Pfizer Research & Development, La Jolla, California 92121, United States
| | - Leanne M Buzon
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Rhonda D Cardin
- Pfizer Research & Development, Pearl River, New York 10965, United States
| | - Natasha R Catlin
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Anthony A Carlo
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Karen J Coffman
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Alyssa Dantonio
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Li Di
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Heather Eng
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Kathleen A Farley
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Rose Ann Ferre
- Pfizer Research & Development, La Jolla, California 92121, United States
| | | | - Scott A Gibson
- Institute for Antiviral Research, Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan, Utah 84322, United States
| | | | | | - Brett L Hurst
- Institute for Antiviral Research, Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan, Utah 84322, United States
| | - Amit S Kalgutkar
- Pfizer Research & Development, Cambridge, Massachusetts 02139, United States
| | - Emi Kimoto
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Lorraine F Lanyon
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Gabrielle H Lovett
- Pfizer Research & Development, Cambridge, Massachusetts 02139, United States
| | - Yajing Lian
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Wei Liu
- Pfizer Research & Development, La Jolla, California 92121, United States
| | | | - Stephen Noell
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - R Scott Obach
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Dafydd R Owen
- Pfizer Research & Development, Cambridge, Massachusetts 02139, United States
| | - Nandini C Patel
- Pfizer Research & Development, Cambridge, Massachusetts 02139, United States
| | - Devendra K Rai
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Matthew R Reese
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Hussin A Rothan
- Pfizer Research & Development, Pearl River, New York 10965, United States
| | - Sylvie Sakata
- Pfizer Research & Development, La Jolla, California 92121, United States
| | - Matthew F Sammons
- Pfizer Research & Development, Cambridge, Massachusetts 02139, United States
| | - Jean G Sathish
- Pfizer Research & Development, Pearl River, New York 10965, United States
| | - Raman Sharma
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Claire M Steppan
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Jamison B Tuttle
- Pfizer Research & Development, Cambridge, Massachusetts 02139, United States
| | - Patrick R Verhoest
- Pfizer Research & Development, Cambridge, Massachusetts 02139, United States
| | - Liuqing Wei
- Pfizer Research & Development, Groton, Connecticut 06340, United States
| | - Qingyi Yang
- Pfizer Research & Development, Cambridge, Massachusetts 02139, United States
| | - Irina Yurgelonis
- Pfizer Research & Development, Pearl River, New York 10965, United States
| | - Yuao Zhu
- Pfizer Research & Development, Pearl River, New York 10965, United States
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3
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Kang G, Xiao LJ, Hesp KD, Huh CW, Lian Y, Richardson P, Schmitt DC, Hong K, Yu JQ. Synthesis of Highly Substituted Aminotetrahydropyrans Enabled by Stereospecific Multivector C-H Functionalization. Org Lett 2024; 26:2729-2732. [PMID: 37294050 DOI: 10.1021/acs.orglett.3c01439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Highly substituted aminotetrahydropyrans were synthesized via sequential C-H functionalizations. The process was initiated with a Pd(II)-catalyzed stereoselective γ-methylene C-H arylation of aminotetrahydropyran, followed by α-alkylation or arylation of the corresponding primary amine. The initial γ-C-H (hetero)arylation was compatible with a range of aryl iodides containing various substituents and provided the corresponding products in moderate to good yields. The subsequent α-alkylation or arylation of the isolated arylated products proceeded with high diastereoselectivity to afford value-added disubstituted aminotetrahydropyrans.
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Affiliation(s)
- Guowei Kang
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Li-Jun Xiao
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Kevin D Hesp
- Treeline Biosciences, 500 Arsenal St, second Floor, Watertown, Massachusetts 02472, United States
| | - Chan Woo Huh
- Medicine Design, Pfizer Inc., Groton, Connecticut 06340, United States
| | - Yajing Lian
- Medicine Design, Pfizer Inc., Groton, Connecticut 06340, United States
| | - Paul Richardson
- Medicine Design, Pfizer Inc., San Diego, California 92121, United States
| | - Daniel C Schmitt
- Medicine Design, Pfizer Inc., Groton, Connecticut 06340, United States
| | - Kai Hong
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Jin-Quan Yu
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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4
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Liu X, Lu Y, Lian Y, Chen Z, Xia J, Meng L, Qi Z. Erratum to 'Macrophage Depletion Improves Chronic Rejection in Rats With Allograft Heart Transplantation' [Trans Proc 52 (2020) 992-1000]. Transplant Proc 2023; 55:1762. [PMID: 32703674 DOI: 10.1016/j.transproceed.2020.04.004] [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: 10/23/2022]
Affiliation(s)
- X Liu
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen, China; Department of General Surgery, Affiliated Xiang'an Hospital of Xiamen University, Xiamen, China
| | - Y Lu
- Department of General Surgery, Affiliated Zhongshan Hospital of Xiamen University, Xiamen, China
| | - Y Lian
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen, China; Department of Thoracic Surgery, Xiamen Hospital of Traditional Chinese Medicine, Xiamen, China
| | - Z Chen
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen, China; Department of General Surgery, The Second Hospital of Xiamen City, Xiamen, China
| | - J Xia
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen, China
| | - L Meng
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen, China
| | - Z Qi
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen, China.
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5
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Garnsey MR, Smith AC, Polivkova J, Arons AL, Bai G, Blakemore C, Boehm M, Buzon LM, Campion SN, Cerny M, Chang SC, Coffman K, Farley KA, Fonseca KR, Ford KK, Garren J, Kong JX, Koos MRM, Kung DW, Lian Y, Li MM, Li Q, Martinez-Alsina LA, O'Connor R, Ogilvie K, Omoto K, Raymer B, Reese MR, Ryder T, Samp L, Stevens KA, Widlicka DW, Yang Q, Zhu K, Fortin JP, Sammons MF. Discovery of the Potent and Selective MC4R Antagonist PF-07258669 for the Potential Treatment of Appetite Loss. J Med Chem 2023; 66:3195-3211. [PMID: 36802610 DOI: 10.1021/acs.jmedchem.2c02012] [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: 02/21/2023]
Abstract
The melanocortin-4 receptor (MC4R) is a centrally expressed, class A GPCR that plays a key role in the regulation of appetite and food intake. Deficiencies in MC4R signaling result in hyperphagia and increased body mass in humans. Antagonism of MC4R signaling has the potential to mitigate decreased appetite and body weight loss in the setting of anorexia or cachexia due to underlying disease. Herein, we report on the identification of a series of orally bioavailable, small-molecule MC4R antagonists using a focused hit identification effort and the optimization of these antagonists to provide clinical candidate 23. Introduction of a spirocyclic conformational constraint allowed for simultaneous optimization of MC4R potency and ADME attributes while avoiding the production of hERG active metabolites observed in early series leads. Compound 23 is a potent and selective MC4R antagonist with robust efficacy in an aged rat model of cachexia and has progressed into clinical trials.
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Affiliation(s)
| | - Aaron C Smith
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | - Jana Polivkova
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | - Autumn L Arons
- Pfizer, Incorporated, Cambridge, Massachusetts 02139, United States
| | - Guoyun Bai
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | | | - Markus Boehm
- Pfizer, Incorporated, Cambridge, Massachusetts 02139, United States
| | - Leanne M Buzon
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | - Sarah N Campion
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | - Matthew Cerny
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | - Shiao-Chi Chang
- Pfizer, Incorporated, Cambridge, Massachusetts 02139, United States
| | - Karen Coffman
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | | | - Kari R Fonseca
- Pfizer, Incorporated, Cambridge, Massachusetts 02139, United States
| | - Kristen K Ford
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | - Jeonifer Garren
- Pfizer, Incorporated, Cambridge, Massachusetts 02139, United States
| | - Jimmy X Kong
- Pfizer, Incorporated, Cambridge, Massachusetts 02139, United States
| | - Martin R M Koos
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | - Daniel W Kung
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | - Yajing Lian
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | - Monica M Li
- Pfizer, Incorporated, Cambridge, Massachusetts 02139, United States
| | - Qifang Li
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | | | | | - Kevin Ogilvie
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | - Kiyoyuki Omoto
- Pfizer, Incorporated, Cambridge, Massachusetts 02139, United States
| | - Brian Raymer
- Pfizer, Incorporated, Cambridge, Massachusetts 02139, United States
| | - Matthew R Reese
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | - Tim Ryder
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | - Lacey Samp
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
| | | | | | - Qingyi Yang
- Pfizer, Incorporated, Cambridge, Massachusetts 02139, United States
| | - Kaicheng Zhu
- Pfizer, Incorporated, Groton, Connecticut 06340, United States
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6
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Futatsugi K, Cabral S, Kung DW, Huard K, Lee E, Boehm M, Bauman J, Clark RW, Coffey SB, Crowley C, Dechert-Schmitt AM, Dowling MS, Dullea R, Gosset JR, Kalgutkar AS, Kou K, Li Q, Lian Y, Loria PM, Londregan AT, Niosi M, Orozco C, Pettersen JC, Pfefferkorn JA, Polivkova J, Ross TT, Sharma R, Stock IA, Tesz G, Wisniewska H, Goodwin B, Price DA. Discovery of Ervogastat (PF-06865571): A Potent and Selective Inhibitor of Diacylglycerol Acyltransferase 2 for the Treatment of Non-alcoholic Steatohepatitis. J Med Chem 2022; 65:15000-15013. [PMID: 36322383 DOI: 10.1021/acs.jmedchem.2c01200] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Discovery efforts leading to the identification of ervogastat (PF-06865571), a systemically acting diacylglycerol acyltransferase (DGAT2) inhibitor that has advanced into clinical trials for the treatment of non-alcoholic steatohepatitis (NASH) with liver fibrosis, are described herein. Ervogastat is a first-in-class DGAT2 inhibitor that addressed potential development risks of the prototype liver-targeted DGAT2 inhibitor PF-06427878. Key design elements that culminated in the discovery of ervogastat are (1) replacement of the metabolically labile motif with a 3,5-disubstituted pyridine system, which addressed potential safety risks arising from a cytochrome P450-mediated O-dearylation of PF-06427878 to a reactive quinone metabolite precursor, and (2) modifications of the amide group to a 3-THF group, guided by metabolite identification studies coupled with property-based drug design.
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Affiliation(s)
- Kentaro Futatsugi
- Pfizer Inc. Medicine Design, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - Shawn Cabral
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Daniel W Kung
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Kim Huard
- Pfizer Inc. Medicine Design, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - Esther Lee
- Pfizer Inc. Medicine Design, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - Markus Boehm
- Pfizer Inc. Medicine Design, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - Jonathan Bauman
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Ronald W Clark
- Pfizer Inc. Internal Medicine Research Unit, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - Steven B Coffey
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Collin Crowley
- Pfizer Inc. Internal Medicine Research Unit, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | | | - Matthew S Dowling
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Robert Dullea
- Pfizer Inc. Internal Medicine Research Unit, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - James R Gosset
- Pfizer Inc. Medicine Design, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - Amit S Kalgutkar
- Pfizer Inc. Medicine Design, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - Kou Kou
- Pfizer Inc. Internal Medicine Research Unit, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - Qifang Li
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Yajing Lian
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Paula M Loria
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Allyn T Londregan
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Mark Niosi
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Christine Orozco
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - John C Pettersen
- Pfizer Inc. Drug Safety R&D, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Jeffrey A Pfefferkorn
- Pfizer Inc. Internal Medicine Research Unit, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - Jana Polivkova
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Trenton T Ross
- Pfizer Inc. Internal Medicine Research Unit, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - Raman Sharma
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Ingrid A Stock
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Gregory Tesz
- Pfizer Inc. Internal Medicine Research Unit, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - Hanna Wisniewska
- Pfizer Inc. Medicine Design, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Bryan Goodwin
- Pfizer Inc. Internal Medicine Research Unit, 1 Portland Street, Cambridge, Massachusetts 02139, United States
| | - David A Price
- Pfizer Inc. Medicine Design, 1 Portland Street, Cambridge, Massachusetts 02139, United States
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7
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Wang C, Li F, Lian Y, He X. Clinical Analysis of Targeted Therapy Combined with Immunotherapy for Neoadjuvant Treatment of Advanced Hepatocellular Carcinoma. Indian J Pharm Sci 2022. [DOI: 10.36468/pharmaceutical-sciences.spl.595] [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: 01/28/2023] Open
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8
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Lian Y, Tian Y. The Clinical Study of the Effect of WBRT on Cognitive Function of Patients With Brain Metastasis of Lung Cancer. Int J Radiat Oncol Biol Phys 2021. [DOI: 10.1016/j.ijrobp.2021.07.1543] [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: 11/25/2022]
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9
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Dong F, Jiang M, Zhang Z, Li F, Lian Y. C1q/TNF-related protein-9 suppresses inflammation in synovial cells from patients with osteoarthritis. Scand J Rheumatol 2021; 51:368-373. [PMID: 34514937 DOI: 10.1080/03009742.2021.1946996] [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: 01/15/2023]
Abstract
Objective: Synovial inflammation contributes to cartilage degeneration and osteoarthritis (OA) development. Targeting the inflammation process may provide a promising strategy for OA treatment. It has been demonstrated that C1q/tumour necrosis factor-related protein-9 (CTRP9) has immunosuppression capabilities. Thus, we conducted this study to investigate the role of CTRP9 in OA and its therapeutic potential.Method: The expression level of CTRP9 was quantified in peripheral blood mononuclear cells (PBMCs), serum, and synovial cells (SCs) isolated from OA patients by quantitative polymerase chain reaction and enzyme-linked immunosorbent assay. The relationship between the expression level of CTRP9 and the disease activity of OA was determined. The inflammation-suppressing effects of CTRP9 were assessed in vitro.Results: The expression level of CTRP9 was increased in the PBMCs and serum of OA compared to healthy controls. The serum level of CTRP9 was found to be positively correlated with erythrocyte sedimentation rate, C-reactive protein, and visual analogue scale score. In addition, CTRP9 protein suppressed the expression of pro-inflammatory cytokines, including tumour necrosis factor-α, interleukin-6, and interleukin-1β, in PBMCs and SCs in vitro. CTRP9 was increased in OA patients and positively correlated with the disease activity. The recombinant CTRP9 had inflammation-suppressing activities in vitro.Conclusion: CTRP9 may have therapeutic potential for treating OA.Osteoarthritis (OA) is characterized as cartilage destruction resulting from synovial inflammation (1-6). According to the clinical symptoms and levels of inflammation, OA has been divided into primary generalized osteoarthritis (PGOA) and erosive inflammatory osteoarthritis (EIOA) (7). The only available treatment for OA is joint replacement. Thus, it is necessary to develop novel and effective therapeutic strategies to treat OA.Because synovial inflammation contributes to OA development, targeting the inflammation process may provide a promising strategy for OA treatment. Previous investigations showed that pro-inflammatory factors promoted OA development (8-10), while anti-inflammatory factors suppressed it (11-14). Thus, we conducted the present study to investigate the role of C1q/tumour necrosis factor-related protein-9 (CTRP9), an anti-inflammatory factor (15), in OA, and its therapeutic potential.
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Affiliation(s)
- F Dong
- Department of Orthopaedic Surgery, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
| | - M Jiang
- Department of Orthopaedic Surgery, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
| | - Z Zhang
- Department of Orthopaedic Surgery, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
| | - F Li
- Department of Orthopaedic Surgery, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
| | - Y Lian
- Department of Orthopaedic Surgery, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, P.R. China
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10
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Saint-Denis TG, Lam NYS, Chekshin N, Richardson PF, Chen JS, Elleraas J, Hesp KD, Schmitt DC, Lian Y, Huh CW, Yu JQ. Mechanistic study of enantioselective Pd-catalyzed C(sp 3)-H activation of thioethers involving two distinct stereomodels. ACS Catal 2021; 11:9738-9753. [PMID: 35572380 DOI: 10.1021/acscatal.1c02808] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Enantioselective C(sp3)-H activation has gained considerable attention from the synthetic chemistry community. Despite the intense interest in these reactions, the mechanisms responsible for enantioselection are still vague. In the course of the development of aryl thioether-directed C(sp3)-H arylation, we noticed extreme variation in sensitivity of two substrate classes to substituent effects of ligands and directing groups: whereas 3-pentyl sulfides (prochiral α-center) responded positively to substitution on ligands and directing groups, isobutyl sulfides (prochiral β-center) were entirely insensitive. Quantitative structure selectivity relationship (QSSR) analyses of directing group and ligand substitution and the development of a new class of mono-N-acetyl protected amino anilamide (MPAAn) ligands led to high enantiomeric ratios (up to 99:1) for thioether-directed C(sp3)-H arylation. Key to the realization of this method was the exploitation of transient chirality at sulfur, which relays stereochemical information from the ligand backbone to enantiotopic carbons of the substrate in a rate- and enantio-determining cyclometallation deprotonation. The absolute stereochemistry of the products for these two substrates were revealed to be opposite. DFT evaluation of all possible diastereomeric transition states confirmed initial premises that guided rational ligand and directing group design. The implications of this study will assist in the further development of enantioselective C(sp3)-H activation, namely by highlighting the non-innocence of directing groups, distal steric influences, and the delicate interplay between steric Pauli repulsion and London dispersion in enantioinduction.
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Affiliation(s)
| | - Nelson Y S Lam
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | - Nikita Chekshin
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
| | - Paul F Richardson
- Oncology Medicinal Chemistry, Pfizer Global Research and Development, San Diego, CA 92121
| | - Jason S Chen
- Automated Synthesis Facility, The Scripps Research Institute, La Jolla, CA 92037
| | - Jeff Elleraas
- Oncology Medicinal Chemistry, Pfizer Global Research and Development, San Diego, CA 92121
| | - Kevin D Hesp
- Medicine Design, Pfizer Global Research and Development, Groton, CT 06340
| | - Daniel C Schmitt
- Medicine Design, Pfizer Global Research and Development, Groton, CT 06340
| | - Yajing Lian
- Medicine Design, Pfizer Global Research and Development, Groton, CT 06340
| | - Chan Woo Huh
- Medicine Design, Pfizer Global Research and Development, Groton, CT 06340
| | - Jin-Quan Yu
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
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11
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Sheridan T, Yayla HG, Lian Y, Genovino J, Monck N, Burton JW. Organophotochemical S N
Ar Reactions of Mildly Electron-Poor Fluoroarenes. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000337] [Citation(s) in RCA: 8] [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: 11/06/2022]
Affiliation(s)
- Thomas Sheridan
- Department of Chemistry; University of Oxford; Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road OX1 3TA Oxford U.K
| | - Hatice G. Yayla
- Chemistry Research Laboratory; Pfizer Worldwide Research and Development; 445 Eastern Point Road 06340 Groton Connecticut United States
| | - Yajing Lian
- Chemistry Research Laboratory; Pfizer Worldwide Research and Development; 445 Eastern Point Road 06340 Groton Connecticut United States
| | - Julien Genovino
- Chemistry Research Laboratory; Pfizer Worldwide Research and Development; 445 Eastern Point Road 06340 Groton Connecticut United States
| | - Nat Monck
- Chemistry Research Laboratory; Evotec (UK) Ltd.; 114 Innovation Drive, Milton Park OX14 4RZ Milton Abingdon U.K
| | - Jonathan W. Burton
- Department of Chemistry; University of Oxford; Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road OX1 3TA Oxford U.K
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12
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Liu X, Lu Y, Lian Y, Chen Z, Xia J, Meng L, Qi Z. Macrophage Depletion Improves Chronic Rejection in Rats With Allograft Heart Transplantation. Transplant Proc 2020; 52:992-1000. [PMID: 32122662 DOI: 10.1016/j.transproceed.2019.12.037] [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] [Received: 02/26/2019] [Revised: 10/11/2019] [Accepted: 12/15/2019] [Indexed: 10/24/2022]
Abstract
BACKGROUND Macrophages may be important in chronic rejection after organ transplantation. This study aimed to investigate the possibility of depleting macrophages for a certain amount of time to alleviate chronic rejection in a heart transplant model of Fischer to Lewis rats. METHODS Clodronate liposome was injected abdominally to deplete macrophages for 2 time frames. The expression levels of ectodysplasin 1, arginase 1 (Arg1), chitinase-like lectin (Ym1), interferon gamma, tumor necrosis factor α (TNF-α), smooth muscle α-actin (α-SMA), monocyte chemoattractant protein 1 (MCP-1), and interleukin 10 (IL-10) were detected. RESULTS 1. The expression levels of α-SMA, interferon gamma, TNF-α, and MCP-1 and the transformation of peripheral T cells were lower after macrophage depletion for 2 or 4 weeks. 2. The expression levels of α-SMA, TNF-α, and MCP-1 and the transformation of peripheral T cells were even lower after 4 weeks compared with 2 weeks, except for interferon gamma. 3. A higher level of expression of Arg1 and Ym1 after macrophage depletion for 2 weeks was observed. 4. A higher level of expression of IL-10 after macrophage depletion for 2 weeks, but not 4 weeks, was also observed. CONCLUSIONS Macrophage clearance after heart transplantation alleviated chronic rejection probably via M2 polarization of regenerated macrophages, reduced T-lymphocyte proliferation, and changed the expression levels of interferon gamma, TNF-α, MCP-1, and IL-10.
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Affiliation(s)
- X Liu
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen, China; Department of General Surgery, Affiliated Xiang'an Hospital of Xiamen University, Xiamen, China.
| | - Y Lu
- Department of General Surgery, Affiliated Zhongshan Hospital of Xiamen University, Xiamen, China
| | - Y Lian
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen, China; Department of Thoracic Surgery, Xiamen Hospital of Traditional Chinese Medicine, Xiamen, China
| | - Z Chen
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen, China; Department of General Surgery, The Second Hospital of Xiamen City, Xiamen, China
| | - J Xia
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen, China
| | - L Meng
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen, China
| | - Z Qi
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen, China.
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13
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Yoritate M, Londregan AT, Lian Y, Hartwig JF. Sequential Xanthalation and O-Trifluoromethylation of Phenols: A Procedure for the Synthesis of Aryl Trifluoromethyl Ethers. J Org Chem 2019; 84:15767-15776. [PMID: 31738556 DOI: 10.1021/acs.joc.9b02717] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Molecules containing trifluoromethoxyaryl groups are of interest in pharmaceutical, agrochemical, and materials science research, due to their unique physical and electronic properties. Many of the known methods to synthesize aryl trifluoromethyl ethers require harsh reagents and highly controlled reaction conditions and rarely occur when heteroaromatic units are present. The two-step O-trifluoromethylation of phenols via aryl xanthates is one such method that suffers from these drawbacks. Herein, we report a method for the synthesis of aryl trifluoromethyl ethers from phenols by the facile conversion of the phenol to the corresponding aryl and heteroaryl xanthates with newly synthesized imidazolium methylthiocarbonothioyl salts and conversion of these xanthates to the trifluoromethyl ethers under mild reaction conditions.
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Affiliation(s)
- Makoto Yoritate
- Department of Chemistry , University of California , Berkeley , California 94720 , United States
| | - Allyn T Londregan
- Medicine Design , Pfizer Inc. , Groton , Connecticut 06340 , United States
| | - Yajing Lian
- Medicine Design , Pfizer Inc. , Groton , Connecticut 06340 , United States
| | - John F Hartwig
- Department of Chemistry , University of California , Berkeley , California 94720 , United States
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14
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Chen L, Zhao W, Zhong G, Watts C, Gunn JP, Liu X, Lian Y, DLP Team. Thermal Analysis on Various Design Concepts of ITER Divertor Langmuir Probes. Fusion Science and Technology 2018. [DOI: 10.1080/15361055.2017.1415614] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- L. Chen
- Southwestern Institute of Physics, Chengdu, Sichuan 610025, China
| | - W. Zhao
- Southwestern Institute of Physics, Chengdu, Sichuan 610025, China
| | - G. Zhong
- Southwestern Institute of Physics, Chengdu, Sichuan 610025, China
| | - C. Watts
- ITER Organization, Route de Vinon-sur-Verdon, CS 90046, 13067 St. Paul Lez Durance Cedex, France
| | | | - X. Liu
- Southwestern Institute of Physics, Chengdu, Sichuan 610025, China
| | - Y. Lian
- Southwestern Institute of Physics, Chengdu, Sichuan 610025, China
| | - DLP Team
- Southwestern Institute of Physics, Chengdu, Sichuan 610025, China
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15
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Genovino J, Lian Y, Zhang Y, Hope TO, Juneau A, Gagné Y, Ingle G, Frenette M. Metal-Free-Visible Light C–H Alkylation of Heteroaromatics via Hypervalent Iodine-Promoted Decarboxylation. Org Lett 2018; 20:3229-3232. [DOI: 10.1021/acs.orglett.8b01085] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [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)
- Julien Genovino
- Pfizer Worldwide Medicinal Chemistry, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Yajing Lian
- Pfizer Worldwide Medicinal Chemistry, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Yuan Zhang
- Pfizer Worldwide Medicinal Chemistry, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Taylor O. Hope
- Département de Chimie, Université du Québec à Montréal, Case Postale 8888, Succursale Centre-Ville, Montréal, Québec, H3C 3P8, Canada
| | - Antoine Juneau
- Département de Chimie, Université du Québec à Montréal, Case Postale 8888, Succursale Centre-Ville, Montréal, Québec, H3C 3P8, Canada
| | - Yohann Gagné
- Département de Chimie, Université du Québec à Montréal, Case Postale 8888, Succursale Centre-Ville, Montréal, Québec, H3C 3P8, Canada
| | - Gajendra Ingle
- Pfizer Worldwide Medicinal Chemistry, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Mathieu Frenette
- Département de Chimie, Université du Québec à Montréal, Case Postale 8888, Succursale Centre-Ville, Montréal, Québec, H3C 3P8, Canada
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16
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Ruppert K, Cauley J, Lian Y, Zgibor JC, Derby C, Solomon DH. The effect of insulin on bone mineral density among women with type 2 diabetes: a SWAN Pharmacoepidemiology study. Osteoporos Int 2018; 29:347-354. [PMID: 29075805 PMCID: PMC5818624 DOI: 10.1007/s00198-017-4276-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 10/13/2017] [Indexed: 12/12/2022]
Abstract
UNLABELLED This was a longitudinal study examining the effects of insulin use on bone mineral density loss. Insulin use was found to be associated with greater bone mineral density loss at the femoral neck among women with diabetes mellitus. INTRODUCTION Women with diabetes mellitus (DM) have higher bone mineral density (BMD) and experience slower BMD loss but have an increased risk of fracture. The data regarding the effect of insulin treatment on BMD remains conflicted. We examined the impact of insulin initiation on BMD. METHODS We investigated the annual changes in BMD associated with the new use of insulin among women with DM in the Study of Women's Health Across the Nation (SWAN). Propensity score (PS) matching, which is a statistical method that helps balance the baseline characteristics of women who did and did not initiate insulin, was used. Covariates with a potential impact on bone health were included in all models. Mixed model regression was used to test the change in BMD between the two groups. Median follow-up time was 5.4 years. RESULTS The cohort consisted of 110 women, mean age, 53.6 years; 49% white and 51% black. Women using insulin (n = 55) were similar on most relevant characteristics to the 55 not using insulin. Median diabetes duration for the user group was 10 vs. 5.0 years for the non-user group. There was a greater loss of BMD at the femoral neck among insulin users (- 1.1%) vs non-users (- 0.77%) (p = 0.04). There were no differences in BMD loss at the spine - 0.30% vs - 0.32% (p = 0.85) or at the total hip - 0.31% vs - 0.25 (p = 0.71), respectively. CONCLUSIONS Women with T2DM who initiated insulin experienced a more rapid BMD loss at the femoral neck as compared to women who did use insulin.
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Affiliation(s)
- K Ruppert
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, 4420 Bayard St Suite 600, Pittsburgh, PA, 15260, USA.
| | - J Cauley
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, 4420 Bayard St Suite 600, Pittsburgh, PA, 15260, USA
| | - Y Lian
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, 4420 Bayard St Suite 600, Pittsburgh, PA, 15260, USA
| | - J C Zgibor
- Department of Epidemiology and Biostatistics, University of South Florida, Tampa, FL, USA
| | - C Derby
- Department of Neurology, Albert Einstein College of Medicine, New York, NY, USA
| | - D H Solomon
- Division of Rheumatology, Division of Pharmacoepidemiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
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17
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Qiu C, Yin T, Zhang Y, Lian Y, You Y, Wang K, Zheng R, Shuai X. Ultrasound Imaging Based on Molecular Targeting for Quantitative Evaluation of Hepatic Ischemia-Reperfusion Injury. Am J Transplant 2017; 17:3087-3097. [PMID: 28489274 DOI: 10.1111/ajt.14345] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 04/26/2017] [Accepted: 04/27/2017] [Indexed: 01/25/2023]
Abstract
The aim of the present study was to quantitatively diagnose and monitor the therapy response of hepatic ischemia-reperfusion injury (IRI) with the use of targeted ultrasound (US) imaging. Targeted microbubbles (MBs) were fabricated, and the binding of intracellular adhesion molecule 1 (ICAM-1) antibodies to MBs was observed. To establish a quantitative method based on targeted US imaging, contrast-enhanced US was applied for IRI rats. After andrographolide treatment, the IRI rats were subjected to the quantitative targeted US imaging for a therapeutic effect. Effective binding of ICAM-1 antibodies to MBs was observed. According to the quantitative targeted US imaging, the ICAM-1 normalized intensity difference (NID) in the IRI rats (38.74 ± 15.08%) was significantly higher than that in the control rats (10.08 ± 2.52%, p = 0.048). Further, different degrees of IRI (mild IRI, moderate to severe IRI) were distinguished by the use of the NID (37.14 ± 2.14%, 22.34 ± 1.08%, p = 0.002). Analysis of mRNA expression demonstrated the accuracy of analyzing the NID by using quantitative targeted US imaging (R2 = 0.7434, p < 0.001). Andrographolide treatment resulted in an obviously weakened NID of ICAM-1 (17.7 ± 4.8% vs 34.2 ± 6.6%, p < 0.001). The study showed the potential of the quantitative targeted US imaging method for the diagnosis and therapeutic monitoring of IRI.
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Affiliation(s)
- C Qiu
- Department of Medical Ultrasound, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangdong Key Laboratory of Liver Disease Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - T Yin
- Department of Medical Ultrasound, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangdong Key Laboratory of Liver Disease Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Y Zhang
- Guangdong Key Laboratory of Liver Disease Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Department of Liver Transplantation, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Y Lian
- Department of Medical Ultrasound, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangdong Key Laboratory of Liver Disease Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Y You
- Department of Medical Ultrasound, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangdong Key Laboratory of Liver Disease Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - K Wang
- Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Science, Beijing, China
| | - R Zheng
- Department of Medical Ultrasound, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Guangdong Key Laboratory of Liver Disease Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - X Shuai
- PCFM Lab of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, China.,Center for Biomedical Engineering, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
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18
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Lian Y, Gao C, Wu Y, Xia J, Leng Y, Liu Y, Zhu M, Chen J, Qi Z. Suppression of Delayed Xenograft Rejection by Resveratrol in a Hamster-to-Rat Cardiac Transplantation Model. Transplant Proc 2017; 49:1483-1491. [DOI: 10.1016/j.transproceed.2017.03.091] [Citation(s) in RCA: 2] [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] [Received: 11/09/2016] [Revised: 03/09/2017] [Accepted: 03/30/2017] [Indexed: 12/13/2022]
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19
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Ji J, Liu T, Xiang B, Liu Z, Jia Y, Lian Y, Lin Z, Xu F, Liu W, Zhu H, Niu T, Pan L, Gong Y, Chang H, Huang J, Wu Y, Li J, He C, Xie L, Ma H, Tang Y, Guo Y, Kuang P, Dong T. A MULTI-CENTER STUDY OF GLIDE CHEMOTHERAPY CONSOLIDATED WITH AUTOLOGOUS STEM CELL TRANSPLANTATION FOR NEWLY DIAGNOSED STAGE IV AND RELAPSED EXTRANODAL NATURAL KILLER/T-CELL LYMPHOMA PATIENTS. Hematol Oncol 2017. [DOI: 10.1002/hon.2438_105] [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: 02/05/2023]
Affiliation(s)
- J. Ji
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - T. Liu
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - B. Xiang
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - Z. Liu
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - Y. Jia
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - Y. Lian
- Hematology; Chengdu First People's Hospital; Chengdu China
| | - Z. Lin
- Hematology; Affiliated Hospital & Clinical Medical College of Chengdu University; Chengdu China
| | - F. Xu
- Hematology; Mianyang Central Hospital; Mianyang China
| | - W. Liu
- Pathology; West China Hospital of Sichuan University; Chengdu China
| | - H. Zhu
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - T. Niu
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - L. Pan
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - Y. Gong
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - H. Chang
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - J. Huang
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - Y. Wu
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - J. Li
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - C. He
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - L. Xie
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - H. Ma
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - Y. Tang
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - Y. Guo
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - P. Kuang
- Hematology; West China Hospital of Sichuan University; Chengdu China
| | - T. Dong
- Hematology; West China Hospital of Sichuan University; Chengdu China
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20
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Harris MR, Li Q, Lian Y, Xiao J, Londregan AT. Construction of 1-Heteroaryl-3-azabicyclo[3.1.0]hexanes by sp3–sp2 Suzuki–Miyaura and Chan–Evans–Lam Coupling Reactions of Tertiary Trifluoroborates. Org Lett 2017; 19:2450-2453. [DOI: 10.1021/acs.orglett.7b01097] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [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)
- Michael R. Harris
- Pfizer Medicinal Sciences, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Qifang Li
- Pfizer Medicinal Sciences, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Yajing Lian
- Pfizer Medicinal Sciences, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Jun Xiao
- Pfizer Medicinal Sciences, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Allyn T. Londregan
- Pfizer Medicinal Sciences, Eastern Point Road, Groton, Connecticut 06340, United States
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21
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Ding J, Xie M, Lian Y, Zhu Y, Peng P, Wang J, Wang L, Wang K. Long noncoding RNA HOXA-AS2 represses P21 and KLF2 expression transcription by binding with EZH2, LSD1 in colorectal cancer. Oncogenesis 2017; 6:e288. [PMID: 28112720 PMCID: PMC5294247 DOI: 10.1038/oncsis.2016.84] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2016] [Revised: 10/06/2016] [Accepted: 10/14/2016] [Indexed: 12/24/2022] Open
Abstract
Long noncoding RNAs (lncRNAs) have received increased attention as a new class of functional regulators involved in human carcinogenesis. HOXA cluster antisense RNA 2 (HOXA-AS2) is a 1048-bp lncRNA located between the HOXA3 and HOXA4 genes in the HOXA cluster that regulates gene expression at a transcription level. HOXA-AS2 is previously found to be overexpressed in gastric cancer (GC) and promotes GC cells proliferation. However, its potential role and molecular mechanism in colorectal cancer (CRC) are not known. Here, we identified that HOXA-AS2 is significantly upregulated in CRC tissue. In addition, increased HOXA-AS2 expression is associated with a larger tumor size and an advanced pathological stage in CRC patients. HOXA-AS2 knockdown significantly suppressed proliferation by blocking the G1/S transition and caused apoptosis of CRC cells in vitro and in vivo. The mechanistic investigations showed that HOXA-AS2 could interact with EZH2 (enhancer of zeste homolog 2), LSD1 (lysine specific demethylase 1) and recruit them to p21 (CDKN1A), KLF2 promoter regions to repress their transcription. Furthermore, the rescue experiments demonstrated that HOXA-AS2 oncogenic function is partly through regulating p21. In conclusion, our data suggest that HOXA-AS2 may function as an oncogene by modulating the multiple genes expression involved in CRC proliferation, and also provides a potential target for CRC therapy.
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Affiliation(s)
- J Ding
- Department of Oncology, Second Affiliated Hospital, Nanjing Medical University, Jiangsu, PR China
| | - M Xie
- Center for Reproduction and Genetics, Suzhou Municipal Hospital, Nanjing Medical University Affiliated Suzhou Hospital, Jiangsu, PR China
| | - Y Lian
- Department of Oncology, Second Affiliated Hospital, Nanjing Medical University, Jiangsu, PR China
| | - Y Zhu
- Department of Oncology, Second Affiliated Hospital, Nanjing Medical University, Jiangsu, PR China
| | - P Peng
- Department of Oncology, Second Affiliated Hospital, Nanjing Medical University, Jiangsu, PR China
| | - J Wang
- Department of Oncology, Second Affiliated Hospital, Nanjing Medical University, Jiangsu, PR China
| | - L Wang
- Department of Oncology, Second Affiliated Hospital, Nanjing Medical University, Jiangsu, PR China
| | - K Wang
- Department of Oncology, Second Affiliated Hospital, Nanjing Medical University, Jiangsu, PR China
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Ren XL, Liu P, Lian Y, Huang J, Zheng XY, Zhu YJ, Qiao J. [Effect of catheter choice during embryo transfer on the clinical outcome of in vitro fertilization-embryo transfer]. Beijing Da Xue Xue Bao Yi Xue Ban 2016; 48:905-909. [PMID: 27752179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
OBJECTIVE To compare two flexible embryo catheters and determine whether clinical outcome differs in the in vitro fertilization-embryo transfer (IVF-ET) cycles. METHODS This prospective control study was conducted by one doctor between July 2012 and November 2013. In the study, 2 064 patients undergoing fresh embryo transfer by using IVF-ET/intracytoplasmic sperm injection (ICSI)-ET in Reproductive Medical Center of Peking University Third Hospital were recruited. The subjects were divided into two groups. Cook Sydney IVF embryo transfer catheters (product model: K-JETS-7019-SIVF) were used for embryo transfer in group 1 (n=949), and Frydman-CCD catheters (product model: 131230301) were used in group 2 (n=1 115). Pregnancy outcomes were compared between these two groups. RESULTS There was no significant difference in age, diagnosis for infertility and stimulation protocol used between the two groups. In addition, there was no difference in the number of oocytes collected and in the number and score of embryos transferred. The significantly higher implantation rate, clinical pregnancy rate, and live birth rate (34.40% vs. 26.92%, 51.21% vs. 41.52%, 42.57% vs. 33.09%, P<0.05) were observed in group 1 compared with group 2. The abortion rate was not significantly different between the two groups (11.93% vs. 15.98%, P>0.05). The proportion of difficult transfer was higher in group 1 than that in group 2 (5.27% vs. 3.41%, P<0.05). There was no difference in the clinical pregnancy rate and live birth rate between the two difficult transfer cycles. CONCLUSION The type of embryo transfer catheter affects the clinical outcome in IVF. Good clinical outcome can be obtained by using Cook Sydney IVF catheter, which is worthy of clinical promotion.
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Affiliation(s)
- X L Ren
- Reproductive Medical Center, Peking University Third Hospital, Beijing 100191, China
| | - P Liu
- Reproductive Medical Center, Peking University Third Hospital, Beijing 100191, China
| | - Y Lian
- Reproductive Medical Center, Peking University Third Hospital, Beijing 100191, China
| | - J Huang
- Reproductive Medical Center, Peking University Third Hospital, Beijing 100191, China
| | - X Y Zheng
- Reproductive Medical Center, Peking University Third Hospital, Beijing 100191, China
| | - Y J Zhu
- Reproductive Medical Center, Peking University Third Hospital, Beijing 100191, China
| | - J Qiao
- Reproductive Medical Center, Peking University Third Hospital, Beijing 100191, China
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Xia H, Gong Z, Lian Y, Zhou J, Wang X. Gene Expression Profile Regulated by CREB in K562 Cell Line. Transplant Proc 2016; 48:2221-34. [PMID: 27569974 DOI: 10.1016/j.transproceed.2016.04.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 03/14/2016] [Accepted: 04/25/2016] [Indexed: 12/15/2022]
Abstract
BACKGROUND Cyclic adenosine monophosphate (cAMP) response element-binding protein (CREB) is a member of the CREB/activation transcription factor 1 family that binds to an octanucleotide cAMP response element consensus sequence in promoters of target genes. METHODS CREB has been shown to regulate a variety of cellular functions, including cell proliferation, survival, apoptosis, differentiation, metabolism, hematopoiesis, immune response, and neuronal activity. CREB was also identified as a proto-oncogene involving in transformation by promoting abnormal proliferation and survival of myeloid cells. To understand the mechanism of CREB functions in leukemogenesis, the transcriptional profiles from a K562 cell line in which CREB was knocked down were analyzed with the use of bioinformatics methods. RESULTS DAVID Bioinformatics Resources and Gene Set Enrichment Analysis (GSEA) were performed to identify the targets that are regulated by CREB. A total of 692 genes were up-regulated and 364 genes down-regulated. The up-regulated genes were significantly enriched in pathways of cancer and chronic myeloid leukemia. GSEA analysis showed expression of Notch1 pathway to be decreased and hypoxia-inducible factor (HIF) pathway to be activated. CONCLUSIONS Our results identified candidate gene sets that could be used to guide research on discovering the mechanism of CREB during leukemogenesis.
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Affiliation(s)
- H Xia
- Department of Blood Transfusion, Dongtai People's Hospital of Jiangsu Province, Dongtai, Jiangsu, People's Republic of China.
| | - Z Gong
- Department of Hematology, Dongtai People's Hospital of Jiangsu Province, Dongtai, Jiangsu, People's Republic of China
| | - Y Lian
- Department of Central Laboratory, Dongtai People's Hospital of Jiangsu Province, Dongtai, Jiangsu, People's Republic of China
| | - J Zhou
- Department of Cardiology, Dongtai People's Hospital of Jiangsu Province, Dongtai, Jiangsu, People's Republic of China
| | - X Wang
- Department of Hematology, Dongtai People's Hospital of Jiangsu Province, Dongtai, Jiangsu, People's Republic of China
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Zhao LM, Jiang H, Hong K, Lin HC, Tang WH, Liu DF, Mao JM, Lian Y, Ma LL. [Outcome of treatment of Y chromosome AZFc microdeletion patients]. Beijing Da Xue Xue Bao Yi Xue Ban 2016; 48:607-611. [PMID: 29263498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
OBJECTIVE To discuss the treatment options for patients with azoospermia factor (AZF) c microdeletion on Y chromosome. METHODS One hundred and eighty three patients, who were diagnosed as AZFc microdeletion on Y chromosome in Peking University Third Hospital, were recruited in our study. In order to get better treatment option for this kind of patients, we retrospectively analyzed their clinic data including the treatment process and pregnancy outcome and found out the characteristics of their semen. RESULTS Among the 183 patients, sperms can be found in ejaculated semen in 105 patients (57.4%, 105/183). One hundred and three patients (98.1%, 103/105) were diagnosed as severe or extremely severe oligospermia. Regular medication was given to 98 patients, 6 patients (6.1%, 6/98) of which got natural pregnancy. The other 99 patients who have sperms in their semen received intracytoplasmic sperm injection (ICSI), 68 patients (68.7%, 68/99) of which got pregnancy. Seventy eight patients were diagnosed as azoospermia among all the 183 patients. Forty nine patients received testicular sperm aspiration (TESA), and 21 patients choose to receive micro-TESE directly. Among the 49 patients with TESA, sperms were retrieved in 17 patients (34.7%, 17/49), and sperms were not retrieved in 32 patients (65.3%, 32/49), of which 12 patients (37.5%, 12/32) gave up treatment and 20 patients (62.5%, 20/32) choose micro-TESE. Among the 41 patients who choose to receive micro-TESE, operation has been done on 19 patients, of which 11 patients (57.9%, 11/19) got sperms. Among the 11 patients, TESA has been done on 6 patients before micro-TESE, of which 4 patients (66.6%, 4/6) got sperms. ICSI has already been done on 7 azoospermia AZFc microdeletion patients who underwent micro-TESE, of which 4 patients (57.1%, 4/7) get pregnancy. CONCLUSION AZFc microdeletion patients who had sperms were always diagnosed as severe or extremely severe oligospermia. ICSI was their first choice instead of drug therapy. For AZFc microdeletion patients who were diagnosed as azoospermia, TESA was one of their choices, however, the success rate is not high. Micro-TESE is still possible to get sperms even after the failure of TESA. Therefore, we may choose micro-TESE instead of TESA in some azoospermia patients in order to reduce surgical trauma on patients.
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Affiliation(s)
- L M Zhao
- Department of Urology, Peking University Third Hospital, Beijing 100191, China
| | - H Jiang
- Department of Urology, Peking University Third Hospital, Beijing 100191, China
| | - K Hong
- Department of Urology, Peking University Third Hospital, Beijing 100191, China
| | - H C Lin
- Department of Urology, Peking University Third Hospital, Beijing 100191, China
| | - W H Tang
- Department of Urology, Peking University Third Hospital, Beijing 100191, China
| | - D F Liu
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China
| | - J M Mao
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China
| | - Y Lian
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China
| | - L L Ma
- Department of Urology, Peking University Third Hospital, Beijing 100191, China
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Abstract
We explore different Skyrmion types in the lowest Landau level of graphene at a filling factor ν=±1. In addition to the formation of spin and valley pseudospin Skyrmions, we show that another type of spin-valley entangled Skyrmions can be stabilized in graphene due to an approximate SU(4) spin-valley symmetry that is affected by sublattice symmetry-breaking terms. These Skyrmions have a clear signature in spin-resolved density measurements on the lattice scale, and we discuss the expected patterns for the different Skyrmion types.
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Affiliation(s)
- Y Lian
- Laboratoire de Physique des Solides, Univ. Paris-Sud, Université Paris-Saclay, CNRS, UMR 8502, F-91405 Orsay Cedex, France
| | - A Rosch
- Institut für Theoretische Physik, Universität zu Köln, D-50937 Cologne, Germany
| | - M O Goerbig
- Laboratoire de Physique des Solides, Univ. Paris-Sud, Université Paris-Saclay, CNRS, UMR 8502, F-91405 Orsay Cedex, France
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Affiliation(s)
- Yajing Lian
- Pfizer Worldwide Medicinal Chemistry, Eastern Point
Road, Groton, Connecticut 06340, United States
| | - Steven B. Coffey
- Pfizer Worldwide Medicinal Chemistry, Eastern Point
Road, Groton, Connecticut 06340, United States
| | - Qifang Li
- Pfizer Worldwide Medicinal Chemistry, Eastern Point
Road, Groton, Connecticut 06340, United States
| | - Allyn T. Londregan
- Pfizer Worldwide Medicinal Chemistry, Eastern Point
Road, Groton, Connecticut 06340, United States
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Zhao LM, Jiang H, Hong K, Lin HC, Tang WH, Liu DF, Mao JM, Lian Y, Ma LL. [Outcome of treatment of Y chromosome AZFc microdeletion patients]. Beijing Da Xue Xue Bao Yi Xue Ban 2016; 48:607-611. [PMID: 27538137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
OBJECTIVE To discuss the treatment options for patients with azoospermia factor (AZF) c microdeletion on Y chromosome. METHODS One hundred and eighty three patients, who were diagnosed as AZFc microdeletion on Y chromosome in Peking University Third Hospital, were recruited in our study. In order to get better treatment option for this kind of patients, we retrospectively analyzed their clinic data including the treatment process and pregnancy outcome and found out the characteristics of their semen. RESULTS Among the 183 patients, sperms can be found in ejaculated semen in 105 patients (57.4%, 105/183). One hundred and three patients (98.1%, 103/105) were diagnosed as severe or extremely severe oligospermia. Regular medication was given to 98 patients, 6 patients (6.1%, 6/98) of which got natural pregnancy. The other 99 patients who have sperms in their semen received intracytoplasmic sperm injection (ICSI), 68 patients (68.7%, 68/99) of which got pregnancy. Seventy eight patients were diagnosed as azoospermia among all the 183 patients. Forty nine patients received testicular sperm aspiration (TESA), and 21 patients choose to receive micro-TESE directly. Among the 49 patients with TESA, sperms were retrieved in 17 patients (34.7%, 17/49), and sperms were not retrieved in 32 patients (65.3%, 32/49), of which 12 patients (37.5%, 12/32) gave up treatment and 20 patients (62.5%, 20/32) choose micro-TESE. Among the 41 patients who choose to receive micro-TESE, operation has been done on 19 patients, of which 11 patients (57.9%, 11/19) got sperms. Among the 11 patients, TESA has been done on 6 patients before micro-TESE, of which 4 patients (66.6%, 4/6) got sperms. ICSI has already been done on 7 azoospermia AZFc microdeletion patients who underwent micro-TESE, of which 4 patients (57.1%, 4/7) get pregnancy. CONCLUSION AZFc microdeletion patients who had sperms were always diagnosed as severe or extremely severe oligospermia. ICSI was their first choice instead of drug therapy. For AZFc microdeletion patients who were diagnosed as azoospermia, TESA was one of their choices, however, the success rate is not high. Micro-TESE is still possible to get sperms even after the failure of TESA. Therefore, we may choose micro-TESE instead of TESA in some azoospermia patients in order to reduce surgical trauma on patients.
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Affiliation(s)
- L M Zhao
- Department of Urology, Peking University Third Hospital, Beijing 100191, China
| | - H Jiang
- Department of Urology, Peking University Third Hospital, Beijing 100191, China
| | - K Hong
- Department of Urology, Peking University Third Hospital, Beijing 100191, China
| | - H C Lin
- Department of Urology, Peking University Third Hospital, Beijing 100191, China
| | - W H Tang
- Department of Urology, Peking University Third Hospital, Beijing 100191, China
| | - D F Liu
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China
| | - J M Mao
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China
| | - Y Lian
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China
| | - L L Ma
- Department of Urology, Peking University Third Hospital, Beijing 100191, China
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Guzmán PE, Lian Y, Davies HM. Reversal of the regiochemistry in the rhodium-catalyzed [4+3] cycloaddition between vinyldiazoacetates and dienes. Angew Chem Int Ed Engl 2014; 53:13083-7. [PMID: 25266984 PMCID: PMC4608551 DOI: 10.1002/anie.201406440] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Revised: 08/02/2014] [Indexed: 12/15/2022]
Abstract
A regio-, diastereo-, and enantioselective [4+3] cycloaddition between vinylcarbenes and dienes has been achieved using the dirhodium tetracarboxylate catalyst [Rh2(S-BTPCP)4]. This methodology provides facile access to 1,4-cycloheptadienes that are regioisomers of those formed from the tandem cyclopropanation/Cope rearrangement reaction of vinylcarbenes with dienes.
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Affiliation(s)
- Pablo E. Guzmán
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA)
| | - Yajing Lian
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA)
| | - Huw M.L. Davies
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA)
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30
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Guzmán PE, Lian Y, Davies HML. Reversal of the Regiochemistry in the Rhodium-Catalyzed [4+3] Cycloaddition between Vinyldiazoacetates and Dienes. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201406440] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Spangler JE, Lian Y, Raikar SN, Davies HML. Synthesis of complex hexacyclic compounds via a tandem Rh(II)-catalyzed double-cyclopropanation/Cope rearrangement/Diels-Alder reaction. Org Lett 2014; 16:4794-7. [PMID: 25208337 PMCID: PMC4168775 DOI: 10.1021/ol502257d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Treatment
of (E)-1-(methoxymethylene)-1,2,3,4-tetrahydronaphthalene
with styryl diazoacetates in the presence of catalytic amounts of
the dirhodium complex Rh2(S-DOSP)4 provides a highly enantioenriched hexacyclic product with
10 new stereogenic centers. The transformation proceeds by a cascade
sequence starting with a double cyclopropanation of a benzene ring,
followed by a Cope rearrangement of a divinylcyclopropane and then
an intramolecular Diels–Alder cycloaddition.
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Affiliation(s)
- Jillian E Spangler
- Department of Chemistry, Emory University , 1515 Dickey Drive, Atlanta, Georgia 30322, United States
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Huang J, Lian Y, Zhao N, Liu P, Qiao J. Which is better for robertsonian translocation’s PGD cycles,blastomere fish or trophectoderm array? Fertil Steril 2014. [DOI: 10.1016/j.fertnstert.2014.07.580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
This paper presents a novel electrocardiogram (ECG) processing technique for joint data compression and QRS detection in a wireless wearable sensor. The proposed algorithm is aimed at lowering the average complexity per task by sharing the computational load among multiple essential signal-processing tasks needed for wearable devices. The compression algorithm, which is based on an adaptive linear data prediction scheme, achieves a lossless bit compression ratio of 2.286x. The QRS detection algorithm achieves a sensitivity (Se) of 99.64% and positive prediction (+P) of 99.81% when tested with the MIT/BIH Arrhythmia database. Lower overall complexity and good performance renders the proposed technique suitable for wearable/ambulatory ECG devices.
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Ma K, Lian Y, Zhou S, Hu R, Xiong Y, Ting P, Xiong Y, Li X, Wang X. Microarray analysis of differentially expressed genes in preeclamptic and normal placental tissues. CLIN EXP OBSTET GYN 2014. [DOI: 10.12891/ceog16432014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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35
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Ma K, Lian Y, Zhou S, Hu R, Xiong Y, Ting P, Xiong Y, Li X, Wang X. Microarray analysis of differentially expressed genes in preeclamptic and normal placental tissues. CLIN EXP OBSTET GYN 2014; 41:261-271. [PMID: 24992773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
PURPOSE OF INVESTIGATION To detect the candidate genes for preeclampsia (PE). MATERIALS AND METHODS The gene expression profiles in preeclamptic and normal placental tissues were analyzed using cDNA microarray approach and the altered expression of important genes were further confirmed by real-time RT-PCR (reverse transcription polymerase chain reaction) technique. Total RNA was extracted from placental tissues of three cases with severe PE and from three cases with normal pregnancy. After scanning, differentially expressed genes were detected by software. RESULTS In two experiments (the fluorescent labels were exchanged), a total of 111 differentially expressed genes were detected. In placental tissue ofpreeclamptic pregnancy, 68 differentially expressed genes were up-regulated, and 44 differentially expressed genes were down-regulated. Of these genes, 16 highly differentially expressed genes were confirmed by real-time fluorescent quantitative RT-PCR, and the result showed that the ratio of gene expression differences was comparable to that detected by cDNA microarray. CONCLUSION The results of bioinformatic analysis showed that encoding products of differentially expressed genes were correlated to infiltration of placenta trophoblastic cells, immunomodulatory factors, pregnancy-associated plasma protein, signal transduction pathway, and cell adhesion. Further studies on the biological function and regulating mechanism of these genes will provide new clues for better understanding of etiology and pathogenesis of PE.
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Lian Y, Hummel JR, Bergman RG, Ellman JA. Facile synthesis of unsymmetrical acridines and phenazines by a Rh(III)-catalyzed amination/cyclization/aromatization cascade. J Am Chem Soc 2013; 135:12548-51. [PMID: 23957711 PMCID: PMC3789141 DOI: 10.1021/ja406131a] [Citation(s) in RCA: 171] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We report formal [3 + 3] annulations of aromatic azides with aromatic imines and azobenzenes to give acridines and phenazines, respectively. These transformations proceed through a cascade process of Rh(III)-catalyzed amination followed by intramolecular electrophilic aromatic substitution and aromatization. Acridines can be directly prepared from aromatic aldehydes by in situ imine formation using catalytic benzylamine.
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Affiliation(s)
- Yajing Lian
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Joshua R. Hummel
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Robert G. Bergman
- Division of Chemical Sciences, Lawrence Berkeley National Laboratory, and Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Jonathan A. Ellman
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
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Thornhill A, Dibouni ZA, Shah T, Wheat S, Teitelbaum M, Walker M, Bissonette F, Yuzpe AL, Leveille MC, Gysler M, Johnson M, Sprague A, Villena JG, Aparicio JL, Gimenez J, Ten J, Perez RB, Scholten I, Chambers GM, van Loendersloot L, van der Veen F, Repping S, Gianotten J, Hompes PGA, Ledger W, Mol BWJ, Dior UP, Laufer N, Granovsky-Grisaru S, Yagel S, Yaffe H, Gielchinsky Y, Nelen WLDM, Huppelschoten AG, Verkerk EW, Adang EMM, Kremer JAM, Davies M, Rumbold A, Marino J, Willson K, Moore V, Giles L, Shebl O, Ebner T, Tews G, Haas D, Oppelt P, Mayer RB, Sanges F, Maggiulli R, Albricci L, Romano S, Scarica C, Schimberni M, Giallonardo A, Vettraino G, Ubaldi F, Rienzi L, Figueira RCS, Braga DPAF, Setti AS, Iaconelli A, Borges E, Obrado EC, Barredo DR, Navarro LL, Rodriguez AV, Rague PNB, Lletget BC, Padro RT, Oron G, Sokal-Arnon T, Zeadna A, Son WY, Holzer H, Tulandi T, Nakamura Y, Hattori H, Sato Y, Kuchiki M, Sakamoto E, Doshida M, Toya M, Kyono K, Nakajo Y, Nakamura Y, Hirata K, Doshida M, Toya M, Kyono K, Xin ZM, Zhu H, Sun YP, Jin HX, Song WY, Rodriguez A, Poisot F, Rodriguez F, Coll O, Vassena R, Vernaeve V, Ye Y, Wang L, Wang N, Le F, Jin F, Zheng Y, Jin F, Lou Y, Le F, Pan PP, Wang N, Wang LY, Hu CX, Liu SY, Zheng YM, Li LJ, Liu XZ, Xu XR, Huang HF, Jin F, Lin SL, Li M, Lian Y, Chen LX, Liu P, Kawwass JF, Crawford S, Kissin DM, Session DR, Boulet S, Jamieson DJ. Quality and safety of ART therapies. Hum Reprod 2013. [DOI: 10.1093/humrep/det219] [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: 11/13/2022] Open
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Abstract
![]()
An efficient, one-step, and highly
functional group-compatible
synthesis of substituted N-aryl-2H-indazoles is reported via the rhodium(III)-catalyzed C–H
bond addition of azobenzenes to aldehydes. The regioselective coupling
of unsymmetrical azobenzenes was further demonstrated and led to the
development of a new removable aryl group that allows for the preparation
of indazoles without N-substitution. The 2-aryl-2H-indazole products also represent a new class of readily
prepared fluorophores for which initial spectroscopic characterization
has been performed.
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Affiliation(s)
- Yajing Lian
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA
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Danielson ME, Beck TJ, Karlamangla AS, Greendale GA, Atkinson EJ, Lian Y, Khaled AS, Keaveny TM, Kopperdahl D, Ruppert K, Greenspan S, Vuga M, Cauley JA. A comparison of DXA and CT based methods for estimating the strength of the femoral neck in post-menopausal women. Osteoporos Int 2013; 24:1379-88. [PMID: 22810918 PMCID: PMC3606278 DOI: 10.1007/s00198-012-2066-y] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 06/06/2012] [Indexed: 01/10/2023]
Abstract
UNLABELLED The study goal was to compare simple two-dimensional (2D) analyses of bone strength using dual energy x-ray absorptiometry (DXA) data to more sophisticated three-dimensional (3D) finite element analyses using quantitative computed tomography (QCT) data. DXA- and QCT-derived femoral neck geometry, simple strength indices, and strength estimates were well correlated. INTRODUCTION Simple 2D analyses of bone strength can be done with DXA data and applied to large data sets. We compared 2D analyses to 3D finite element analyses (FEA) based on QCT data. METHODS Two hundred thirteen women participating in the Study of Women's Health Across the Nation (SWAN) received hip DXA and QCT scans. DXA BMD and femoral neck diameter and axis length were used to estimate geometry for composite bending (BSI) and compressive strength (CSI) indices. These and comparable indices computed by Hip Structure Analysis (HSA) on the same DXA data were compared to indices using QCT geometry. Simple 2D engineering simulations of a fall impacting on the greater trochanter were generated using HSA and QCT femoral neck geometry; these estimates were benchmarked to a 3D FEA of fall impact. RESULTS DXA-derived CSI and BSI computed from BMD and by HSA correlated well with each other (R=0.92 and 0.70) and with QCT-derived indices (R=0.83-0.85 and 0.65-0.72). The 2D strength estimate using HSA geometry correlated well with that from QCT (R=0.76) and with the 3D FEA estimate (R=0.56). CONCLUSIONS Femoral neck geometry computed by HSA from DXA data corresponds well enough to that from QCT for an analysis of load stress in the larger SWAN data set. Geometry derived from BMD data performed nearly as well. Proximal femur breaking strength estimated from 2D DXA data is not as well correlated with that derived by a 3D FEA using QCT data.
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Affiliation(s)
- M E Danielson
- Department of Epidemiology, University of Pittsburgh, 130 DeSoto St., Pittsburgh, PA 15261, USA.
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Lian Y, Huber T, Hesp KD, Bergman RG, Ellman JA. Rhodium(III)-catalyzed alkenyl C-H bond functionalization: convergent synthesis of furans and pyrroles. Angew Chem Int Ed Engl 2013; 52:629-33. [PMID: 23172703 PMCID: PMC3770945 DOI: 10.1002/anie.201207995] [Citation(s) in RCA: 158] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Indexed: 11/10/2022]
Abstract
Ring in the new: a new annulation for the efficient synthesis of substituted furans and pyrroles is reported. The Rh(III) -catalyzed reaction of O-methyl α,β-unsaturated oximes with aldehydes and N-tosyl imines affords secondary alcohol and amine intermediates, respectively. Cyclization and aromatization occurs under the reaction conditions to provide access to biologically relevant furans and pyrroles in good yields. Cp*=C(5)Me(5), DCE=1,2-dichloroethane, THF=tetrahydrofuran.
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Affiliation(s)
- Yajing Lian
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, CT 06520 (USA)
| | - Tatjana Huber
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, CT 06520 (USA)
| | - Kevin D. Hesp
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, CT 06520 (USA)
| | - Robert G. Bergman
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720-1416 (USA), Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (USA)
| | - Jonathan A. Ellman
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, CT 06520 (USA)
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Lian Y, Huber T, Hesp KD, Bergman RG, Ellman JA. Rhodium(III)-Catalyzed Alkenyl CH Bond Functionalization: Convergent Synthesis of Furans and Pyrroles. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201207995] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Valette D, Lian Y, Haydek JP, Hardcastle KI, Davies HML. Alkynoate synthesis through the vinylogous reactivity of rhodium(II) carbenoids. Angew Chem Int Ed Engl 2012; 51:8636-9. [PMID: 22807172 PMCID: PMC3580044 DOI: 10.1002/anie.201204047] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Revised: 06/14/2012] [Indexed: 11/06/2022]
Abstract
Siloxy group migration: A rhodium(II) carbenoid approach has been developed for the synthesis of alkynoates. This transformation combines the addition of enol ethers at the vinylogous position of β-siloxy-substituted vinyldiazo derivatives with a siloxy group migration to give the products as single diastereomers.
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Affiliation(s)
- Damien Valette
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA)
| | - Yajing Lian
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA)
| | - John P. Haydek
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA)
| | - Kenneth I. Hardcastle
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA)
| | - Huw M. L. Davies
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA)
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Lian Y, Bergman RG, Ellman JA. Rhodium(iii)-catalyzed synthesis of phthalides by cascade addition and cyclization of benzimidates with aldehydes. Chem Sci 2012; 3:3088-3092. [PMID: 23050074 DOI: 10.1039/c2sc20835k] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
We herein report the Rh(iii)-catalyzed C-H bond activation and addition of benzimidates to aldehydes to afford biologically important phthalides in a single step. The imidate is a novel and unexplored directing group that not only enables C-H bond activation and addition to aldehydes, but also serves to capture the reversibly formed alcohol intermediate. The reaction shows broad scope with a high level of functional group compatibility and is applicable to both aromatic and aliphatic aldehydes.
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Affiliation(s)
- Yajing Lian
- Department of Chemistry, Yale University, Connecticut, 06520, USA. ; Tel: +1-203-432-2647
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Valette D, Lian Y, Haydek JP, Hardcastle KI, Davies HML. Alkynoate Synthesis through the Vinylogous Reactivity of Rhodium(II) Carbenoids. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204047] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Damien Valette
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA) http://www.chemistry.emory.edu/
| | - Yajing Lian
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA) http://www.chemistry.emory.edu/
| | - John P. Haydek
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA) http://www.chemistry.emory.edu/
| | - Kenneth I. Hardcastle
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA) http://www.chemistry.emory.edu/
| | - Huw M. L. Davies
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, GA 30322 (USA) http://www.chemistry.emory.edu/
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Abstract
The development of methods for the stereoselective functionalization of sp(3) C-H bonds is a challenging undertaking. This Account describes the scope of the combined C-H functionalization/Cope rearrangement (CHCR), a reaction that occurs between rhodium-stabilized vinylcarbenoids and substrates containing allylic C-H bonds. Computational studies have shown that the CHCR reaction is initiated by a hydride transfer to the carbenoid from an allyl site on the substrate, which is then rapidly followed by C-C bond formation between the developing rhodium-bound allyl anion and the allyl cation. In principle, the reaction can proceed through four distinct orientations of the vinylcarbenoid and the approaching substrate. The early examples of the CHCR reaction were all highly diastereoselective, consistent with a reaction proceeding via a chair transition state with the vinylcarbenoid adopting an s-cis conformation. Recent computational studies have revealed that other transition state orientations are energetically accessible, and these results have guided the development of highly stereoselective CHCR reactions that proceed through a boat transition state with the vinylcarbenoid in an s-cis configuration. The CHCR reaction has broad applications in organic synthesis. In some new protocols, the CHCR reaction acts as a surrogate to some of the classic synthetic strategies in organic chemistry. The CHCR reaction has served as a synthetic equivalent of the Michael reaction, the vinylogous Mukaiyama aldol reaction, the tandem Claisen rearrangement/Cope rearrangement, and the tandem aldol reaction/siloxy-Cope rearrangement. In all of these cases, the products are generated with very high diastereocontrol. With a chiral dirhodium tetracarboxylate catalyst such as Rh(2)(S-DOSP)(4) or Rh(2)(S-PTAD)(4), researchers can achieve very high levels of asymmetric induction. Applications of the CHCR reaction include the effective enantiodifferentiation of racemic dihydronaphthalenes and the total synthesis of several natural products: (-)-colombiasin A, (-)-elisapterosin B, and (+)-erogorgiaene. By combining the CHCR reaction into a further cascade sequence, we and other researchers have achieved the asymmetric synthesis of 4-substituted indoles, a new class of monoamine reuptake inhibitors.
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Affiliation(s)
- Huw M L Davies
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, USA.
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Wang Y, Deepu CJ, Lian Y. A computationally efficient QRS detection algorithm for wearable ECG sensors. Annu Int Conf IEEE Eng Med Biol Soc 2012; 2011:5641-4. [PMID: 22255619 DOI: 10.1109/iembs.2011.6091365] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In this paper we present a novel Dual-Slope QRS detection algorithm with low computational complexity, suitable for wearable ECG devices. The Dual-Slope algorithm calculates the slopes on both sides of a peak in the ECG signal; And based on these slopes, three criterions are developed for simultaneously checking 1)Steepness 2)Shape and 3)Height of the signal, to locate the QRS complex. The algorithm, evaluated against MIT/BIH Arrhythmia Database, achieves a very high detection rate of 99.45%, a sensitivity of 99.82% and a positive prediction of 99.63%.
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Affiliation(s)
- Y Wang
- National University of Singapore. yichao@ nus.edu.sg
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Yu Y, Yan J, Li M, Yan L, Zhao Y, Lian Y, Li R, Liu P, Qiao J. Effects of combined epidermal growth factor, brain-derived neurotrophic factor and insulin-like growth factor-1 on human oocyte maturation and early fertilized and cloned embryo development. Hum Reprod 2012; 27:2146-59. [DOI: 10.1093/humrep/des099] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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Abstract
Asymmetric functionalization of N-heterocycles by vinylcarbenoids in the presence of catalytic amounts of Rh(2)(S-biTISP)(2) has been successfully developed. This bridged dirhodium catalyst not only selectively enforces the reaction to occur at the vinylogous position of the carbenoid but also affords high levels of asymmetric induction.
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Affiliation(s)
- Yajing Lian
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, USA
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Deng J, Lian Y, Shen C, Chen Y, Zhang M, Wang YJ, Zhou HD. Adverse life event and risk of cognitive impairment: a 5-year prospective longitudinal study in Chongqing, China. Eur J Neurol 2011; 19:631-7. [DOI: 10.1111/j.1468-1331.2011.03599.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [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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Lambert RF, Hinkle RJ, Ammann SE, Lian Y, Liu J, Lewis SE, Pike RD. Bi(OTf)3-, TfOH-, and TMSOTf-mediated, one-pot epoxide rearrangement, addition, and intramolecular silyl-modified Sakurai (ISMS) cascade toward dihydropyrans: comparison of catalysts and role of Bi(OTf)3. J Org Chem 2011; 76:9269-77. [PMID: 21916500 PMCID: PMC3359705 DOI: 10.1021/jo201478d] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Catalytic quantities of bismuth(III) triflate efficiently initiate the rearrangement of epoxides to aldehydes, which subsequently react with (Z)-δ-hydroxyalkenylsilanes to afford 2,6-disubstituted 3,6-dihydro-2H-pyrans. Isolated yields of desired products using Bi(OTf)(3) were compared with yields obtained when the reactions were run with TfOH and TMSOTf in the presence and absence of several additives. These studies, as well as NMR spectroscopic analyses, indicate an initial Lewis acid/base interaction between Bi(OTf)(3) and substrates providing TfOH in situ.
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Affiliation(s)
- R. Frederick Lambert
- Department of Chemistry, The College of William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795
| | - Robert J. Hinkle
- Department of Chemistry, The College of William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795
| | - Stephen E. Ammann
- Department of Chemistry, The College of William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795
| | - Yajing Lian
- Department of Chemistry, The College of William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795
| | - Jia Liu
- Department of Chemistry, The College of William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795
| | - Shane E. Lewis
- Department of Chemistry, The College of William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795
| | - Robert D. Pike
- Department of Chemistry, The College of William & Mary, P.O. Box 8795, Williamsburg, VA 23187-8795
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