1
|
Tong WY, Ly TD, Zhao TT, Wu YB, Wang X. Mechanism of C–P bond formation via Pd-catalyzed decarbonylative phosphorylation of amides: insight into the chemistry of the second coordination sphere. Chem Commun (Camb) 2020; 56:113-116. [DOI: 10.1039/c9cc07923h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
DFT computations establish a detailed reaction mechanism for the first Pd-catalyzed decarbonylative phosphorylation of amides forming C–P bonds, which includes non-covalent interactions as well as proton transfer in the second coordination sphere.
Collapse
Affiliation(s)
- Wen-Yan Tong
- The Key Laboratory of Energy Conversion and Storage of Shanxi Province
- Institute of Molecular Science
- Shanxi University
- Taiyuan
- People's Republic of China
| | - Thu D. Ly
- Department of Chemistry
- University of Colorado Denver
- Denver
- USA
| | - Tao-Tao Zhao
- The Key Laboratory of Energy Conversion and Storage of Shanxi Province
- Institute of Molecular Science
- Shanxi University
- Taiyuan
- People's Republic of China
| | - Yan-Bo Wu
- The Key Laboratory of Energy Conversion and Storage of Shanxi Province
- Institute of Molecular Science
- Shanxi University
- Taiyuan
- People's Republic of China
| | - Xiaotai Wang
- Department of Chemistry
- University of Colorado Denver
- Denver
- USA
- Hoffmann Institute of Advanced Materials
| |
Collapse
|
2
|
Wang X, Ma G, Peng Y, Pitsch CE, Moll BJ, Ly TD, Wang X, Gong H. Ni-Catalyzed Reductive Coupling of Electron-Rich Aryl Iodides with Tertiary Alkyl Halides. J Am Chem Soc 2018; 140:14490-14497. [DOI: 10.1021/jacs.8b09473] [Citation(s) in RCA: 136] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Xuan Wang
- School of Materials Science and Engineering, Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, Shanghai University, 99 Shang-Da Road, Shanghai 200444, China
| | - Guobin Ma
- School of Materials Science and Engineering, Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, Shanghai University, 99 Shang-Da Road, Shanghai 200444, China
| | - Yu Peng
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Chloe E. Pitsch
- Department of Chemistry, University of Colorado Denver, Campus Box 194,
P.O. Box 173364, Denver, Colorado 80217-3364, United States
| | - Brenda J. Moll
- Department of Chemistry, University of Colorado Denver, Campus Box 194,
P.O. Box 173364, Denver, Colorado 80217-3364, United States
| | - Thu D. Ly
- Department of Chemistry, University of Colorado Denver, Campus Box 194,
P.O. Box 173364, Denver, Colorado 80217-3364, United States
| | - Xiaotai Wang
- Department of Chemistry, University of Colorado Denver, Campus Box 194,
P.O. Box 173364, Denver, Colorado 80217-3364, United States
| | - Hegui Gong
- School of Materials Science and Engineering, Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, Shanghai University, 99 Shang-Da Road, Shanghai 200444, China
| |
Collapse
|
3
|
Malkin JE, Morand P, Malvy D, Ly TD, Chanzy B, de Labareyre C, El Hasnaoui A, Hercberg S. Seroprevalence of HSV-1 and HSV-2 infection in the general French population. Sex Transm Infect 2002; 78:201-3. [PMID: 12238654 PMCID: PMC1744464 DOI: 10.1136/sti.78.3.201] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND In spite of the large prevalence and growing incidence of herpes simplex infection (HSV-1 and HSV-2), relatively few large serological surveys are available worldwide and it is still difficult compare frequencies of HSV contaminations in various countries. We present the results of HERPIMAX, the first epidemiological inquiry on HSV prevalence in the general French population. METHODS Of a cohort of 12,735 presumed healthy adult volunteers included in the prospective study SU.VI.MAX, designed to assess the relation between nutritional supplementations and degenerative diseases, HERPIMAX randomly selected 4412 subjects (females 66.5%, males 33.5%). All serum samples were assessed for HSV-1 and HSV-2 IgG antibodies with a HSV type specific, enzyme immunosorbent assay (EIA). Equivocal result were retested with another HSV type specific immunoblot assay combined with a type common HSV IgG EIA in order to give a definitive interpretation. RESULTS The mean seroprevalence was 67% for HSV-1 and 17.2% for HSV-2. For HSV-2 the seroprevalence was higher in females (17.9%) compared with males (13.7%) (p<0.001). For both HSV types, there was no significant difference in prevalence as regards age distribution in males and females, whereas prevalence increased significantly with age in females for HSV-1. Univariate analysis showed a significant association between HSV-1 prevalence and education level in males and females (p<0.001) and between HSV-2 prevalence and marital status in both sexes (p<0.001). There were geographical disparities, with a higher HSV-2 prevalence in the south of France as well as in Paris. CONCLUSION These results confirm a high prevalence of HSV infection in France. They are also in agreement with previous results of other survey carried out in other developed countries as regards higher prevalence of HSV-2 infection in women, the stability of seroprevalence for both HSV types after 35 years of age in females and 45 years of age in males.
Collapse
Affiliation(s)
- J E Malkin
- Service de Pathologie Infectieuse et Tropicale, Centre Médicale de l'Institut Pasteur, Paris, France.
| | | | | | | | | | | | | | | |
Collapse
|
4
|
Laperche S, Ly TD. [Sensitivity of HIV infection screening assays in 2001]. Ann Biol Clin (Paris) 2002; 60:307-15. [PMID: 12050047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Early detection of human immunodeficiency virus (HIV) infection is critical for clinical diagnosis and treatment of patients, as well as for ensuring the safety of blood products. Recently, fourth-generation HIV screening assays have been developed with the objective to offer an increased sensitivity by combining detection of anti-HIV antibodies (Ab) with detection of the p24 viral antigen (Ag). Eight different HIV assays commercially available in France (five fourth-generation HIV screening assays and three third-generation HIV Ab-only assays) were compared in a broad number of seroconversion panels (n = 27). This extensive analysis highlights: 1) the importance of p24 Ag detection for early diagnosis; 2) the improved sensitivity of fourth-generation assays over Ab-only tests. In conclusion, these results emphasize the detection limitations of the different assays and suggest improvements for future HIV screening assays.
Collapse
Affiliation(s)
- S Laperche
- Laboratoire Claude-Lévy (LCL), 78, avenue de Verdun, 94200 Ivry-sur-Seine, France
| | | |
Collapse
|
5
|
Ly TD, Martin L, Daghfal D, Sandridge A, West D, Bristow R, Chalouas L, Qiu X, Lou SC, Hunt JC, Schochetman G, Devare SG. Seven human immunodeficiency virus (HIV) antigen-antibody combination assays: evaluation of HIV seroconversion sensitivity and subtype detection. J Clin Microbiol 2001; 39:3122-8. [PMID: 11526139 PMCID: PMC88307 DOI: 10.1128/jcm.39.9.3122-3128.2001] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.0] [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: 11/20/2022] Open
Abstract
In this study, we evaluated the performance of two prototype human immunodeficiency virus (HIV) antigen-antibody (Ag-Ab) combination assays, one from Abbott Laboratories (AxSYM HIV Ag-Ab) and the other from bioMerieux (VIDAS HIV Duo Ultra), versus five combination assays commercially available in Europe. The assays were Enzygnost HIV Integral, Genscreen Plus HIV Ag-Ab, Murex HIV Ag-Ab Combination, VIDAS HIV Duo, and Vironostika HIV Uniform II Ag-Ab. All assays were evaluated for the ability to detect p24 antigen from HIV-1 groups M and O, antibody-positive plasma samples from HIV-1 groups M and O, HIV-2, and 19 HIV seroconversion panels. Results indicate that although all combination assays can detect antibodies to HIV-1, group M, subtypes A to G, circulating recombinant form (CRF) A/E, and HIV-1 group O, their sensitivity varied considerably when tested using diluted HIV-1 group O and HIV-2 antibody-positive samples. Among combination assays, the AxSYM, Murex, and VIDAS HIV Duo Ultra assays exhibited the best antigen sensitivity (at approximately 25 pg of HIV Ag/ml) for detection of HIV-1 group M, subtypes A to G and CRF A/E, and HIV-1 group O isolates. However, the VIDAS HIV Duo Ultra assay had a lower sensitivity for HIV-1 group M and subtype C, and was unable to detect subtype C antigen even at 125 pg of HIV Ag/ml. The HIV antigen sensitivity of the VIDAS HIV Duo and Genscreen Plus combination assays was approximately 125 pg of HIV Ag/ml for detection of all HIV-1 group M isolates except HIV-1 group O while the sensitivity of Vironostika HIV Uniform II Ag-Ab and Enzygnost HIV Integral Ag-Ab assays for all the group M subtypes was >125 pg of HIV Ag/ml. Among the combination assays, the AxSYM assay had the best performance for detection of early seroconversion samples, followed by the Murex and VIDAS HIV Duo Ultra assays.
Collapse
Affiliation(s)
- T D Ly
- Laboratoire Claude Levy, Ivry sur Seine, France
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Ly TD, Laperche S, Couroucé AM. Early detection of human immunodeficiency virus infection using third- and fourth-generation screening assays. Eur J Clin Microbiol Infect Dis 2001; 20:104-10. [PMID: 11305462 DOI: 10.1007/s100960000430] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Early detection of infection with human immunodeficiency virus (HIV) is critical for clinical diagnosis and treatment of patients, as well as for ensuring the safety of blood transfusion products. Recently, a number of fourth-generation HIV screening assays have been developed that offer increased sensitivity over earlier tests by combining detection of anti-HIV antibodies with detection of the p24 viral antigen. Previously, six different HIV assays were compared against a broad range of 30 seroconversion panels. In the present study, three of the newer fourth-generation assays were tested together with three of the third-generation HIV antibody-only assays. This extensive analysis highlights (i) the importance of p24 antigen detection for early diagnosis, (ii) the improved sensitivity of fourth-generation assays over antibody-only tests, and (iii) the superior performance of the Vidas Duo assay, which allows reduction of the diagnostic window by up to 2 weeks. Finally, the results emphasize the detection limitations of the different assays and suggest improvements for future HIV screening assays.
Collapse
Affiliation(s)
- T D Ly
- Laboratoire Claude Lévy, France
| | | | | |
Collapse
|
7
|
van der Ende ME, Guillon C, Boers PH, Ly TD, Gruters RA, Osterhaus AD, Schutten M. Antiviral resistance of biologic HIV-2 clones obtained from individuals on nucleoside reverse transcriptase inhibitor therapy. J Acquir Immune Defic Syndr 2000; 25:11-8. [PMID: 11064499 DOI: 10.1097/00042560-200009010-00002] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To study phenotypic and genotypic resistance of HIV-2 against nucleoside reverse transcriptase inhibitors (NRTI). METHODS Biologic HIV-2 clones were generated from 3 patients before and after initiation of antiretroviral therapy with zidovudine (AZT) in patient RH2-7, AZT and didanosine (ddI) in patient PH2-1, and after addition of lamivudine (3TC) to AZT monotherapy in patient RH2-5. The sensitivity to NRTI of the virus clones, as defined by the 50% inhibitory concentration (IC(50)), was determined in vitro. The predicted amino acid sequences of the reverse transcriptase proteins from these clones were determined. RESULTS Comparing the sensitivity of the biologic HIV-2 clones obtained after start of therapy with those from antiviral naive patients, resistance had developed to AZT (patients RH2-7 and RH2-5) and 3TC (patient PH2-1 and RH2-5). No resistance to AZT was observed in the biologic clone from PH2-1 obtained after start of therapy. The resistant clones from RH2-5 and PH2-1, but not RH2-7, contained amino acid mutations at positions where HIV-1 has been shown to mutate after AZT and 3TC treatment. CONCLUSIONS Phenotypic resistance of HIV-2 to nucleoside analogues, which developed in HIV-2-infected patients treated with NRTIs, was associated with genotypic changes. Some of the mutations at amino acid positions in the HIV-2 reverse transcriptase gene corresponded with those involved in HIV-1 resistance, although no conventional mutations associated with resistance to AZT were observed.
Collapse
Affiliation(s)
- M E van der Ende
- Department of Internal Medicine, University Hospital Centre Rotterdam, Rotterdam, The Netherlands
| | | | | | | | | | | | | |
Collapse
|
8
|
Ly TD, Edlinger C, Vabret A. Contribution of combined detection assays of p24 antigen and anti-human immunodeficiency virus (HIV) antibodies in diagnosis of primary HIV infection by routine testing. J Clin Microbiol 2000; 38:2459-61. [PMID: 10917776 PMCID: PMC86847 DOI: 10.1128/jcm.38.6.2459-2461.2000] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
9
|
Ly TD, Malkin JE, Bohbot JM. Performance of a rapid screening test POCkit HSV2 Rapid Test. Int J STD AIDS 1999; 10:68. [PMID: 10215136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
|
10
|
Segondy M, Ly TD, Lapeyre M, Montes B. Evaluation of the Nuclisens HIV-1 QT assay for quantitation of human immunodeficiency virus type 1 RNA levels in plasma. J Clin Microbiol 1998; 36:3372-4. [PMID: 9774598 PMCID: PMC105334 DOI: 10.1128/jcm.36.11.3372-3374.1998] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Nuclisens HIV-1 QT is a new version of the NASBA HIV-1 QT assay for quantitation of human immunodeficiency virus type 1 (HIV-1) RNA in plasma. The specificity of this assay was 100% in one laboratory and 99%-with nonrepeatability of the initial false positive-in another. The test was linear between 2.0 and 6.0 log RNA copies per ml. According to the input HIV-1 RNA concentration, accuracy varied from -0.11 to +0.10 log RNA copy per ml and precision varied from 0.66 to 0.14 log RNA copy per ml. Reproducibility decreased when the HIV-1 RNA level was near the lower limit of quantitation of the test. HIV-1 RNA could be quantitated by Nuclisens HIV-1 QT in 36% (laboratory 1) and 24% (laboratory 2) of clinical samples with HIV-1 RNA levels lower than the lower limit of quantitation by NASBA HIV-1 QT. Nuclisens HIV-1 QT was not suitable for measurement of RNA from clade G and group O HIV-1 strains.
Collapse
Affiliation(s)
- M Segondy
- Laboratoire de Virologie, Centre Hospitalier Universitaire de Montpellier, Montpellier, France.
| | | | | | | |
Collapse
|
11
|
Abstract
OBJECTIVE To assess the disease progression rate among 12 HIV-2-infected West European residents (nine of West African descent), compared with the disease progression rate among HIV-1-infected individuals of the same population, and the characteristics of the HIV-2 strains involved. METHODS HIV-2-infected individuals were identified by commercially available serological assays, their clinical status and CD4+ cell counts were monitored, and HIV-2 was isolated from their peripheral blood mononuclear cells. T-cell-line tropism and syncytium-inducing capacities of the isolated viruses were determined and their phylogenetic relationships were analysed by comparing polymerase chain reaction-amplified nucleotide sequences of reverse transcriptase (RT) gene segments. RESULTS Eight of the 12 HIV-2-infected individuals presented with progressive disease and one of them progressed from Centers for Disease Control and Prevention group A1 to A3 within 36 months after seroconversion. The ratios of asymptomatic versus symptomatic individuals among residents of the Rotterdam region of West African descent were 2:7 for HIV-2 and 8:9 for HIV-1-infected individuals. HIV-2 was isolated from six of the nine individuals with progressive disease. The time required for virus isolation correlated inversely with the individuals' CD4+ cell counts. Five of the HIV-2 isolates replicated in immortalized T-cell lines, and two isolates from patients with AIDS were syncytium-inducing. Five HIV-2 isolates from patients born in the Cape Verdian Isles grouped together within subtype A. The HIV-2 isolate from a patient of Ghanese origin belonged to subtype B. Mutations were identified in the RT genes from HIV-2 isolates of two zidovudine-treated patients, one of which has also been shown to be involved in zidovudine resistance in HIV-1. CONCLUSION Disease progression in HIV-2 infection may be as rapid as in HIV-1. HIV-2 isolation and viral phenotype were related to disease status, and mutations identical to those observed in HIV-1 zidovudine resistance were observed in patients treated with zidovudine.
Collapse
Affiliation(s)
- M E van der Ende
- Department of Internal Medicine, University Hospital Dijkzigt, Rotterdam, The Netherlands
| | | | | | | | | |
Collapse
|
12
|
Loussert-Ajaka I, Chaix ML, Korber B, Letourneur F, Gomas E, Allen E, Ly TD, Brun-Vézinet F, Simon F, Saragosti S. Variability of human immunodeficiency virus type 1 group O strains isolated from Cameroonian patients living in France. J Virol 1995; 69:5640-9. [PMID: 7637010 PMCID: PMC189421 DOI: 10.1128/jvi.69.9.5640-5649.1995] [Citation(s) in RCA: 116] [Impact Index Per Article: 4.0] [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: 01/26/2023] Open
Abstract
Human immunodeficiency virus type 1 (HIV-1) nucleotide sequences encoding p24Gag and the Env C2V3 region were obtained from seven patients who were selected on the basis of having paradoxical seronegativity on a subset of HIV enzyme-linked immunosorbent assay detection kits and having atypical Western blot (immunoblot) reactivity. Sequence analyses showed that all of these strains were more closely related to the recently described Cameroonian HIV isolates of group O (HIV-1 outlier) than to group M (HIV-1 major). All seven patients had Cameroonian origins but were living in France at the time the blood samples were taken. Characterization of a large number of group M strains has to date revealed eight distinct genetic subtypes (A to H). Genetic distances between sequences from available group O isolates were generally comparable to those observed in M intersubtype sequence comparisons, showing that the group O viruses are genetically very diverse. Analysis of sequences from these seven new viral strains, combined with the three previously characterized group O strains, revealed few discernable phylogenetic clustering patterns among the 10 patients' viral sequences. The level of diversity among group O sequences suggests that they may have a comparable (or greater) age than the M group sequences, although for unknown reasons, the latter group dispersed first and is the dominant lineage in the pandemic.
Collapse
Affiliation(s)
- I Loussert-Ajaka
- Laboratoire de Virologie, Hôpital Bichat-Claude Bernard, Paris, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Lamhamedi-Cherradi S, Culmann-Penciolelli B, Guy B, Ly TD, Goujard C, Guillet JG, Gomard E. Different patterns of HIV-1-specific cytotoxic T-lymphocyte activity after primary infection. AIDS 1995; 9:421-6. [PMID: 7639966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
OBJECTIVE To analyse the HIV-1-specific cytotoxic T-lymphocyte (CTL) responses of nine HIV-seropositive subjects in relation with primary infection. METHODS Anti-HIV CTL were generated by in vitro stimulation of peripheral mononuclear cells obtained from HIV-seropositive donors at various times after primary infection. They were tested against several structural or regulatory HIV-1 proteins, using autologous target cells infected with recombinant vaccinia viruses expressing one of the HIV-1LAI proteins. RESULTS An important CTL activity was found during the first month following seroconversion only in those donors who showed clinical symptoms during primary infection. The temporal evolution of this response differed for each subject; one remained a non-responder even 30 months after seroconversion. The structural proteins were recognized particularly early, while the antigenicity of regulatory proteins appeared later. CONCLUSION Different patterns of HIV-specific CTL response can be observed after primary infection. The evolution of infection in these different HIV-seropositive subjects will be particularly interesting to analyse.
Collapse
Affiliation(s)
- S Lamhamedi-Cherradi
- Laboratory of Immunology of Cellular and Molecular Interactions, Cochin Hospital, Paris, France
| | | | | | | | | | | | | |
Collapse
|
14
|
Simon F, Ly TD, Baillou-Beaufils A, Fauveau V, De Saint-Martin J, Loussert-Ajaka I, Chaix ML, Saragosti S, Courouce AM, Ingrand D. Sensitivity of screening kits for anti-HIV-1 subtype O antibodies. AIDS 1994; 8:1628-9. [PMID: 7848605 DOI: 10.1097/00002030-199411000-00021] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
|
15
|
Abstract
Nine patients with atypical HIV-1 western blot profiles were diagnosed as having HIV-1 subtype O infection. All the patients were living in France; eight originated from Cameroon and one from France. Lymphocyte DNA amplification by the polymerase chain reaction was only positive when HIV-1 subtype O specific primers were used. Preliminary sequence analysis of amplified products and serological reactivity against a specific subtype O synthetic env peptide confirmed HIV-1 subtype O infection. HIV-1/HIV-2 enzyme-linked immunosorbent assays, especially those based on env peptides or on the sandwich format, can be negative in HIV-1 subtype O infection.
Collapse
Affiliation(s)
- I Loussert-Ajaka
- Virology Department, Bichat-Claude Bernard Hospital, Paris, France
| | | | | | | | | | | | | | | |
Collapse
|