1
|
Tran DH, Tran HT, Vo B, Than TT, Nguyen VT, Le VP, Phung H. Enhancing classical swine fever virus identification: the advantages of Field-LAMP testing. Aust Vet J 2024; 102:67-73. [PMID: 37875328 DOI: 10.1111/avj.13297] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 09/22/2023] [Accepted: 10/07/2023] [Indexed: 10/26/2023]
Abstract
Classical swine fever virus (CSFV) identification has witnessed significant advancements with the development of rapid reverse-transcription loop-mediated isothermal amplification (RT-LAMP) assays. However, conventional RT-LAMP assays for CSFV diagnosis are hindered by a laborious RNA extraction step. Moreover, the need for thermal incubators and expensive micropipettes has limited their application in field settings. Addressing these challenges, our study presents a groundbreaking solution-an electro-free and point-of-care (POC) tool known as the field-LAMP assay-for the rapid clinical detection of CSFV. By eliminating the RNA extraction requirement, advancing the colorimetric read-out and lyophilized reaction reagents, our field-LAMP assay streamlines the diagnostic process, saving valuable time and effort. This novel approach also overcomes the dependency on electric-dependent thermal incubators and expensive micropipettes, making it practical and accessible for use in the field. The successful development of the field-LAMP assay marks a significant milestone in CSFV detection. This electro-free and POC tool offers several advantages, including its ability to deliver rapid results without compromising accuracy, facilitating prompt response and containment measures.
Collapse
Affiliation(s)
- D H Tran
- NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
| | - H T Tran
- NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
| | - Btt Vo
- NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
| | - T T Than
- College of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi, Vietnam
| | - V T Nguyen
- Institute of Veterinary Science and Technology, Hanoi, Vietnam
| | - V P Le
- College of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi, Vietnam
| | - Htt Phung
- NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
| |
Collapse
|
2
|
Nguyen VT, Sharp MK, Superchi C, Baron G, Glonti K, Blanco D, Olsen M, Vo Tat TT, Olarte Parra C, Névéol A, Hren D, Ravaud P, Boutron I. Biomedical doctoral students' research practices when facing dilemmas: two vignette-based randomized control trials. Sci Rep 2023; 13:16371. [PMID: 37773192 PMCID: PMC10541422 DOI: 10.1038/s41598-023-42121-1] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Accepted: 09/05/2023] [Indexed: 10/01/2023] Open
Abstract
Our aim was to describe the research practices of doctoral students facing a dilemma to research integrity and to assess the impact of inappropriate research environments, i.e. exposure to (a) a post-doctoral researcher who committed a Detrimental Research Practice (DRP) in a similar situation and (b) a supervisor who did not oppose the DRP. We conducted two 2-arm, parallel-group randomized controlled trials. We created 10 vignettes describing a realistic dilemma with two alternative courses of action (good practice versus DRP). 630 PhD students were randomized through an online system to a vignette (a) with (n = 151) or without (n = 164) exposure to a post-doctoral researcher; (b) with (n = 155) or without (n = 160) exposure to a supervisor. The primary outcome was a score from - 5 to + 5, where positive scores indicated the choice of DRP and negative scores indicated good practice. Overall, 37% of unexposed participants chose to commit DRP with important variation across vignettes (minimum 10%; maximum 66%). The mean difference [95%CI] was 0.17 [- 0.65 to 0.99;], p = 0.65 when exposed to the post-doctoral researcher, and 0.79 [- 0.38; 1.94], p = 0.16, when exposed to the supervisor. In conclusion, we did not find evidence of an impact of postdoctoral researchers and supervisors on student research practices.Trial registration: NCT04263805, NCT04263506 (registration date 11 February 2020).
Collapse
Affiliation(s)
- V T Nguyen
- Centre for Research in Epidemiology and Statistics (CRESS), Université Paris Cité and Université Sorbonne Paris Nord, Inserm, INRAE, 75004, Paris, France
- Department of Health Services Research, Institute of Population Health Sciences, University of Liverpool, Liverpool, UK
| | - M K Sharp
- Centre for Research in Epidemiology and Statistics (CRESS), Université Paris Cité and Université Sorbonne Paris Nord, Inserm, INRAE, 75004, Paris, France
- Department of Psychology, Faculty of Humanities and Social Sciences, University of Split, Split, Croatia
- Royal College of Surgeons in Ireland University of Medicine and Health Sciences, Dublin, Ireland
| | - C Superchi
- Centre for Research in Epidemiology and Statistics (CRESS), Université Paris Cité and Université Sorbonne Paris Nord, Inserm, INRAE, 75004, Paris, France
- Statistics and Operations Research Department, Barcelona-Tech, UPC, Barcelona, Spain
| | - G Baron
- Centre for Research in Epidemiology and Statistics (CRESS), Université Paris Cité and Université Sorbonne Paris Nord, Inserm, INRAE, 75004, Paris, France
- Centre d'Epidémiologie Clinique, AP-HP, Hôpital Hôtel Dieu, 75004, Paris, France
| | - K Glonti
- Centre for Research in Epidemiology and Statistics (CRESS), Université Paris Cité and Université Sorbonne Paris Nord, Inserm, INRAE, 75004, Paris, France
- Department of Psychology, Faculty of Humanities and Social Sciences, University of Split, Split, Croatia
| | - D Blanco
- Centre for Research in Epidemiology and Statistics (CRESS), Université Paris Cité and Université Sorbonne Paris Nord, Inserm, INRAE, 75004, Paris, France
- Department of Physiotherapy, Universitat Internacional de Catalunya, Barcelona, Spain
| | - M Olsen
- Centre for Research in Epidemiology and Statistics (CRESS), Université Paris Cité and Université Sorbonne Paris Nord, Inserm, INRAE, 75004, Paris, France
- Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - T T Vo Tat
- Centre for Research in Epidemiology and Statistics (CRESS), Université Paris Cité and Université Sorbonne Paris Nord, Inserm, INRAE, 75004, Paris, France
- Department of Statistics and Data Science, The Wharton School, University of Pennsylvania, Philadelphia, USA
| | - C Olarte Parra
- Centre for Research in Epidemiology and Statistics (CRESS), Université Paris Cité and Université Sorbonne Paris Nord, Inserm, INRAE, 75004, Paris, France
- Department of Applied Mathematics, Computer Science and Statistics, Ghent University, Ghent, Belgium
| | | | - D Hren
- Department of Psychology, Faculty of Humanities and Social Sciences, University of Split, Split, Croatia
| | - P Ravaud
- Centre for Research in Epidemiology and Statistics (CRESS), Université Paris Cité and Université Sorbonne Paris Nord, Inserm, INRAE, 75004, Paris, France
- Centre d'Epidémiologie Clinique, AP-HP, Hôpital Hôtel Dieu, 75004, Paris, France
| | - I Boutron
- Centre for Research in Epidemiology and Statistics (CRESS), Université Paris Cité and Université Sorbonne Paris Nord, Inserm, INRAE, 75004, Paris, France.
- Centre d'Epidémiologie Clinique, AP-HP, Hôpital Hôtel Dieu, 75004, Paris, France.
- Centre d'Épidémiologie Clinique, Hôpital Hôtel Dieu, 1 place du Parvis Notre-Dame, Cedex 4, 75089, Paris, France.
| |
Collapse
|
3
|
Proctor SP, Nguyen VT, Hebert AA, Taylor KM, McClung HL, Heaton KJ, Ospina M, Calafat AM. Individual-level permethrin exposure biomarkers in U.S. army soldiers: comparison of two treatment formulations for military uniforms. J Expo Sci Environ Epidemiol 2023; 33:132-139. [PMID: 35999257 PMCID: PMC10140735 DOI: 10.1038/s41370-022-00466-1] [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: 04/22/2022] [Revised: 08/05/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Evidence suggests that wearing permethrin-treated military uniforms is not associated with current adverse health conditions. However, exposure through this route results in permethrin biomarker concentrations considerably higher than those in the U.S. POPULATION The U.S. Army is exploring different methods of uniform treatment that reduce exposure while maintaining effective protection from insect vector-borne diseases. OBJECTIVE To compare permethrin exposure when wearing two types of permethrin-treated military uniforms. METHODS Eight male soldiers participated in a 32-day crossover design study to compare permethrin exposure when wearing the current Army uniform (CurrU) and a uniform with a new applied fabric treatment (NewU). Each soldier wore the uniforms for designated 8 h/day time periods over 3 consecutive days separated by a 'wash-out' week of no exposure. Permethrin exposure was assessed from the urinary concentrations of 3-phenoxybenzoic acid (3-PBA) and of the sum of cis- and trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane-1-carboxylic acid (∑DCCA). Estimated dose was determined based on ∑DCCA concentrations. RESULTS Permethrin exposure biomarkers were 21% (3-PBA, p = 0.025) and 35% (∑DCCA, p < 0.001) lower when wearing the NewU compared to the CurrU; the dose was 33% lower (p = 0.05). SIGNIFICANCE Findings suggest the new treatment reduces human permethrin exposure biomarkers resulting from wearing-treated military uniforms.
Collapse
Affiliation(s)
- Susan P Proctor
- Military Performance Division, United States Army Research Institute of Environmental Medicine, 10 General Greene Avenue, Natick, MA, USA.
- VA Boston Healthcare System, Research Service, 180 South Huntington Avenue, Boston, MA, USA.
| | - V T Nguyen
- Military Performance Division, United States Army Research Institute of Environmental Medicine, 10 General Greene Avenue, Natick, MA, USA
| | - Ashley A Hebert
- Military Performance Division, United States Army Research Institute of Environmental Medicine, 10 General Greene Avenue, Natick, MA, USA
| | - Kathryn M Taylor
- Military Performance Division, United States Army Research Institute of Environmental Medicine, 10 General Greene Avenue, Natick, MA, USA
| | - Holly L McClung
- Military Performance Division, United States Army Research Institute of Environmental Medicine, 10 General Greene Avenue, Natick, MA, USA
| | - Kristin J Heaton
- Military Performance Division, United States Army Research Institute of Environmental Medicine, 10 General Greene Avenue, Natick, MA, USA
| | - Maria Ospina
- Centers for Disease Control and Prevention, National Center for Environmental Health, Division of Laboratory Sciences, 4770 Buford Hwy, Atlanta, GA, USA
| | - Antonia M Calafat
- Centers for Disease Control and Prevention, National Center for Environmental Health, Division of Laboratory Sciences, 4770 Buford Hwy, Atlanta, GA, USA
| |
Collapse
|
4
|
Nguyen TTH, Qu Z, Nguyen VT, Nguyen TT, Le TTA, Chen S, Ninh ST. Natural Prenylated Xanthones as Potential Inhibitors of PI3k/Akt/mTOR Pathway in Triple Negative Breast Cancer Cells. Planta Med 2022; 88:1141-1151. [PMID: 34963183 DOI: 10.1055/a-1728-5166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Three prenylated xanthones, garcinone E (1: ), bannaxanthone D (2: ) and bannanxanthone E (3: ) were isolated from the leaves of Garcinia mckeaniana Graib. Their structures were elucidated by spectral methods and compared with literature data. To evaluate their anti-proliferative effects in tumor cells, firstly, cisplatin was used as a positive control and the effects of compound 1: - 3: were determined by performing MTT assay in MDA-MB-231, CNE-2 and A549 cancer cells. The results showed compound 1: - 3: exhibited stronger inhibitory effect than cisplatin in MDA-MB-231. Further effects of compound 1: - 3: in TNBC MDA-MB-231 and MDA-MB-468 cells were examined by performing cell cycle and apoptosis assays. The results indicated that compound 1: - 3: had ability to arrest cell cycle at G2/M phase and induce apoptosis. Furthermore, compound 2: significantly down-regulated PI3K, Akt and mTOR levels in both total proteins and phosphorylated form, which is its potential anti-cancer mechanism. These findings indicated that those prenylated xanthones might serve as promising leading compounds for the development of anticancer drug for TNBC.
Collapse
Affiliation(s)
- Thi Thu Ha Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology, Hanoi, Vietnam
- Graduate University of Sciences and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Zhao Qu
- Medical College of China Three Gorges University, Yichang, China
- State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation), Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen, China
| | - Van Tuyen Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology, Hanoi, Vietnam
- Graduate University of Sciences and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Thanh Tra Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology, Hanoi, Vietnam
- Graduate University of Sciences and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Thi Tu Anh Le
- Institute of Chemistry, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Sibao Chen
- State Key Laboratory of Chinese Medicine and Molecular Pharmacology (Incubation), Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen, China
- Research Center for Chinese Medicine Innovation, The Hong Kong Polytechnic University, Hong Kong, China
- Department of Applied Biology & Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, China
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Son The Ninh
- Institute of Chemistry, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| |
Collapse
|
5
|
Nguyen VT, Braun A, Kraft J, Ta TMT, Panagiotaropoulou GM, Nguyen VP, Nguyen TH, Trubetskoy V, Le CT, Le TTH, Pham XT, Heuser-Collier I, Lam NH, Böge K, Hahne IM, Bajbouj M, Zierhut MM, Hahn E, Ripke S. Increasing sample diversity in psychiatric genetics - Introducing a new cohort of patients with schizophrenia and controls from Vietnam - Results from a pilot study. World J Biol Psychiatry 2022; 23:219-227. [PMID: 34449294 DOI: 10.1080/15622975.2021.1951474] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVES Genome-Wide Association Studies (GWAS) of Schizophrenia (SCZ) have provided new biological insights; however, most cohorts are of European ancestry. As a result, derived polygenic risk scores (PRS) show decreased predictive power when applied to populations of different ancestries. We aimed to assess the feasibility of a large-scale data collection in Hanoi, Vietnam, contribute to international efforts to diversify ancestry in SCZ genetic research and examine the transferability of SCZ-PRS to individuals of Vietnamese Kinh ancestry. METHODS In a pilot study, 368 individuals (including 190 SCZ cases) were recruited at the Hanoi Medical University's associated psychiatric hospitals and outpatient facilities. Data collection included sociodemographic data, baseline clinical data, clinical interviews assessing symptom severity and genome-wide SNP genotyping. SCZ-PRS were generated using different training data sets: (i) European, (ii) East-Asian and (iii) trans-ancestry GWAS summary statistics from the latest SCZ GWAS meta-analysis. RESULTS SCZ-PRS significantly predicted case status in Vietnamese individuals using mixed-ancestry (R2 liability = 4.9%, p = 6.83 × 10-8), East-Asian (R2 liability = 4.5%, p = 2.73 × 10-7) and European (R2 liability = 3.8%, p = 1.79 × 10-6) discovery samples. DISCUSSION Our results corroborate previous findings of reduced PRS predictive power across populations, highlighting the importance of ancestral diversity in GWA studies.
Collapse
Affiliation(s)
- V T Nguyen
- Department of Psychiatry, Hanoi Medical University, Hà Nội, Việt Nam.,National Institute of Mental Health, Bach Mai Hospital, Hà Nội, Việt Nam
| | - A Braun
- Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Charité Mitte, Berlin, Germany
| | - J Kraft
- Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Charité Mitte, Berlin, Germany
| | - T M T Ta
- Berlin Institute of Health, Charité - Universitätsmedizin Berlin, BIH Academy, Clinician Scientist Program, Berlin, Germany.,Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Benjamin Franklin, Berlin, Germany
| | - G M Panagiotaropoulou
- Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Charité Mitte, Berlin, Germany
| | - V P Nguyen
- Department of Psychiatry, Hanoi Medical University, Hà Nội, Việt Nam
| | - T H Nguyen
- Department of Psychiatry, Hanoi Medical University, Hà Nội, Việt Nam.,Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Benjamin Franklin, Berlin, Germany
| | - V Trubetskoy
- Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Charité Mitte, Berlin, Germany
| | - C T Le
- Department of Psychiatry, Hanoi Medical University, Hà Nội, Việt Nam.,National Institute of Mental Health, Bach Mai Hospital, Hà Nội, Việt Nam
| | - T T H Le
- Department of Psychiatry, Hanoi Medical University, Hà Nội, Việt Nam.,National Institute of Mental Health, Bach Mai Hospital, Hà Nội, Việt Nam
| | - X T Pham
- Department of Psychiatry, Hanoi Medical University, Hà Nội, Việt Nam
| | - I Heuser-Collier
- Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Benjamin Franklin, Berlin, Germany
| | - N H Lam
- Hanoi Mental Hospital, Hà Nội, Việt Nam
| | - K Böge
- Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Benjamin Franklin, Berlin, Germany
| | - I M Hahne
- Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Benjamin Franklin, Berlin, Germany
| | - M Bajbouj
- Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Benjamin Franklin, Berlin, Germany
| | - M M Zierhut
- Berlin Institute of Health, Charité - Universitätsmedizin Berlin, BIH Academy, Clinician Scientist Program, Berlin, Germany.,Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Benjamin Franklin, Berlin, Germany
| | - E Hahn
- Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Benjamin Franklin, Berlin, Germany
| | - S Ripke
- Charité - Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Campus Charité Mitte, Berlin, Germany.,Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, MA, USA
| |
Collapse
|
6
|
Nguyen VT, Jatta A, Mayer R, Meier JL. Evaluation of Undiagnosed HIV Estimates Computed from the CD4 Depletion Model in a Rural, Medium-low HIV Prevalence State. AIDS Behav 2022; 26:613-622. [PMID: 34355286 DOI: 10.1007/s10461-021-03419-1] [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] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/31/2021] [Indexed: 11/25/2022]
Abstract
The CD4 depletion model estimates diagnosis delays by approximating infection date from CD4 T-cell count at diagnosis, and back-calculation can compute the proportion of undiagnosed PLWHA. The model assumes the immigration of PLWHA to the U.S. is negligible and counts as a transmission event, which may be impractical outside high prevalence states. Duration of U.S. residency among foreign-born PLWHA and diagnosis delays were compared. The impact on estimates of undiagnosed PLWHA was tested through simulation with different proportions of foreign-born people assumed to have acquired HIV abroad. In 67% of foreign-born people, the mean (SD) years of delay (9.9 (6.3)) exceeded the duration of U.S. residency (2.0 (1.9)). Additionally, inaccuracies in the estimates for proportions of undiagnosed PLWHA were pronounced when foreign-born people who acquired HIV abroad comprised 30% of diagnoses. The CD4 model inadvertently misclassified some diagnoses as in-state transmission events. Consequently, simulated results demonstrated inaccuracies and unstable calculations.
Collapse
Affiliation(s)
- V T Nguyen
- College of Public Health, University of Iowa, Iowa City, IA, USA.
- VA Connecticut Health Care System, West Haven, CT, USA.
- Yale University, Epidemiology & Public Health, PO Box 208034, New Haven, CT, 06520-8034, USA.
| | - A Jatta
- Iowa Department of Public Health, Bureau of HIV, STD, and Hepatitis, Des Moines, IA, USA
| | - R Mayer
- Iowa Department of Public Health, Bureau of HIV, STD, and Hepatitis, Des Moines, IA, USA
| | - J L Meier
- College of Public Health, University of Iowa, Iowa City, IA, USA
- College of Medicine, University of Iowa, Iowa City, IA, USA
- Iowa City Veterans Affairs Medical Center, Iowa City, IA, USA
| |
Collapse
|
7
|
Rigatelli G, Zuin M, Vassilev D, Huy D, Nguyen VT, Nguyen N, Ronco F, Roncon L. Feasibility, safety and long term outcomes of complex left main bifurcation treatment using the nano inverted t stenting: a multicentre registry. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.1228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
The role of double stenting techniques in distal bifurcation left main (LM) disease has gaining interest over the latest years.
Purpose
We present the 3-year multicentre registry outcomes of dual stenting using ultra-thin strut stents and the Nano Inverted-T (NIT) technique in complex unprotected true LM bifurcation disease.
Methods
We analysed the procedural and medical data of consecutive patients enrolled between 1st January 2014 and 1st December 2019 in a multicentre registry for complex LM bifurcation disease treated with the double stenting technique called NIT due contraindications and/or refusal to surgical treatment. Target lesion failure (TLF) was defined as the composite of cardiovascular death, target-vessel MI (TVMI) and clinically driven target lesion revascularization (TLR).
Results
Among two hundred-ninety-five patients (138 males, mean age 70.3±12.8 years), post-operative success was achieved in 100% of cases. Contrast volume, procedural time, and radiation exposure were 139.2±23.4 ml, 15.3±4.9 min, and 1080±1034 cGy/m2 (Figure), respectively. At a mean follow-up of 39.5±0.6 months TLF rate was 6.1% (n=18) while TLR and cardiovascular mortality rates were 3.0 (n=9) and 2.6% (n=8), respectively. Clinically driven angiographic follow-up was available in 26.4% of patients at a mean time from the procedure of 7.5±0.4 months. Clinically restenosis rate was 3.3%.
Conclusions
Revascularization of complex LM bifurcation disease using the NIT double stenting technique resulted feasible and safe with a low incidence of TLF, excellent survival rate and no stent thrombosis. Figure 1.The NIT technique is based on the use of ultra-thin strut (≤80 micron) stents and double stenting starting with side branch stenting frst. The side branch stent is precisely positioned with one possibly only strut protruding into the main vessel which is balloon crushed before the implantation of the main branch stenting. The Proximal optimization technique (POT)–snuggle kissing–POT sequence is mandatory to ensure the coverage of the side branch ostium by both side branch and main branch stents. Snuggle kissing was performed placing the LCX balloon with the proximal marker at the middle rather than at the proximal marker of the LM-LAD balloon, in order to minimize the elliptical deformation of the LM stent.
Funding Acknowledgement
Type of funding sources: None. Figure 1
Collapse
Affiliation(s)
| | - M Zuin
- University Hospital Sainta Anna, Ferrara, Italy
| | - D Vassilev
- University Hospital Alexandrovska, Sofia, Bulgaria
| | - D Huy
- Tam Duc Heart Hospital, Ho Chi Minh, Viet Nam
| | - V T Nguyen
- Thong Nhat Hospital, Ho Chi Minh, Viet Nam
| | - N Nguyen
- Cho Ray Hospital, Ho Chi Minh, Viet Nam
| | - F Ronco
- Hospital dell'Angelo, Mestre-Venice, Italy
| | - L Roncon
- General Hospital of Rovigo, Rovigo, Italy
| |
Collapse
|
8
|
Nguyen TTH, Nguyen VT, Van Cuong P, Nguyen Thanh T, Le Thi TA, Mai Huong DT, Truong BN, Litaudon M, Ninh The S. A new flavonoid from the leaves of Garcinia mckeaniana Craib and α-glucosidase and acetylcholinesterase inhibitory activities. Nat Prod Res 2021; 36:5074-5080. [PMID: 33939580 DOI: 10.1080/14786419.2021.1916019] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
From the ethyl acetate extract (EtOAc) of the Vietnamese Garcinia mckeaniana leaves, a new flavone 8-C-glycoside 2'',6''-di-O-acetylvitexin (1), together with six known analogs 2-7 were isolated. Their structures were determined by spectral methods and compared with literature data. In α-glucosidase inhibitory assay, the EtOAc extract and its flavone and biflavone derivatives possessed the significant IC50 range of 9.17-97.53 µM, as compared with that of the positive control acarbose (249 µM). Flavones and biflavones showed are better than flavone glycosides in both α-glucosidase and acetylcholinesterase inhibitory activities.
Collapse
Affiliation(s)
- Thi Thu Ha Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam.,Faculty of Chemistry, Graduate University of Science and Technology, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Van Tuyen Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam.,Faculty of Chemistry, Graduate University of Science and Technology, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Pham Van Cuong
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Tra Nguyen Thanh
- Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam.,Faculty of Chemistry, Graduate University of Science and Technology, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Tu Anh Le Thi
- Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Doan Thi Mai Huong
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Bich Ngan Truong
- Institute of Marine Biochemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Marc Litaudon
- French National Centre for Scientific Research, Paris, France
| | - Son Ninh The
- Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| |
Collapse
|
9
|
Nguyen QL, Okuno N, Hamashima T, Dang ST, Fujikawa M, Ishii Y, Enomoto A, Maki T, Nguyen HN, Nguyen VT, Fujimori T, Mori H, Andrae J, Betsholtz C, Takao K, Yamamoto S, Sasahara M. Vascular PDGFR-alpha protects against BBB dysfunction after stroke in mice. Angiogenesis 2021; 24:35-46. [PMID: 32918673 DOI: 10.1007/s10456-020-09742-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 09/01/2020] [Indexed: 02/06/2023]
Abstract
Blood-brain barrier (BBB) dysfunction underlies the pathogenesis of many neurological diseases. Platelet-derived growth factor receptor-alpha (PDGFRα) induces hemorrhagic transformation (HT) downstream of tissue plasminogen activator in thrombolytic therapy of acute stroke. Thus, PDGFs are attractive therapeutic targets for BBB dysfunction. In the present study, we examined the role of PDGF signaling in the process of tissue remodeling after middle cerebral arterial occlusion (MCAO) in mice. Firstly, we found that imatinib increased lesion size after permanent MCAO in wild-type mice. Moreover, imatinib-induced HT only when administrated in the subacute phase of MCAO, but not in the acute phase. Secondly, we generated genetically mutated mice (C-KO mice) that showed decreased expression of perivascular PDGFRα. Additionally, transient MCAO experiments were performed in these mice. We found that the ischemic lesion size was not affected; however, the recruitment of PDGFRα/type I collagen-expressing perivascular cells was significantly downregulated, and HT and IgG leakage was augmented only in the subacute phase of stroke in C-KO mice. In both experiments, we found that the expression of tight junction proteins and PDGFRβ-expressing pericyte coverage was not significantly affected in imatinib-treated mice and in C-KO mice. The specific implication of PDGFRα signaling was suggestive of protective effects against BBB dysfunction during the subacute phase of stroke. Vascular TGF-β1 expression was downregulated in both imatinib-treated and C-KO mice, along with sustained levels of MMP9. Therefore, PDGFRα effects may be mediated by TGF-β1 which exerts potent protective effects in the BBB.
Collapse
Affiliation(s)
- Quang Linh Nguyen
- Department of Pathology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, 930-0194, Japan
- Stroke Center, The 108 Military Central Hospital, Ha Noi, Vietnam
| | - Noriko Okuno
- Department of Pathology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, 930-0194, Japan
| | - Takeru Hamashima
- Department of Pathology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, 930-0194, Japan
| | - Son Tung Dang
- Department of Pathology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, 930-0194, Japan
| | - Miwa Fujikawa
- Department of Pathology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, 930-0194, Japan
| | - Yoko Ishii
- Department of Health Science, Faculty of Health and Human Development, The University of Nagano, Nagano, Japan
| | - Atsushi Enomoto
- Department of Pathology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Takakuni Maki
- Department of Neurology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | | | - Van Tuyen Nguyen
- Stroke Center, The 108 Military Central Hospital, Ha Noi, Vietnam
| | - Toshihiko Fujimori
- Division of Embryology, National Institute for Basic Biology, Okazaki, Japan
| | - Hisashi Mori
- Department of Molecular Neuroscience, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Johanna Andrae
- Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
| | - Christer Betsholtz
- Department of Immunology, Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
- Integrated Cardio Metabolic Center, Karolinska Institute, Huddinge, Sweden
| | - Keizo Takao
- Division of Animal Resources and Development, Life Science Research Center, University of Toyama, Toyama, Japan
| | - Seiji Yamamoto
- Department of Pathology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, 930-0194, Japan.
| | - Masakiyo Sasahara
- Department of Pathology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, 930-0194, Japan.
| |
Collapse
|
10
|
Hung TQ, Dang TT, Langer P, Do HN, Quan NM, Van Phuc B, Van Tinh D, Tien NQ, Nga TTT, Nguyen VT. Efficient Copper-Catalysed Synthesis of Carbazoles by Double N-Arylation of Primary Amines with 2,2′-Dibromobiphenyl in the Presence of Air. Synlett 2021. [DOI: 10.1055/s-0040-1706641] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
AbstractAn efficient Cu-catalyzed synthesis of carbazole derivatives is reported, which proceeds by double C–N coupling reactions of 2,2′-dibromobiphenyl and amines in the presence of air. The reaction is robust, proceeds in high yields, and tolerates a series of amines including neutral, electron-rich, electron-deficient aromatic amines and aliphatic amines.
Collapse
Affiliation(s)
- Tran Quang Hung
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology
- Institute of Chemistry, Vietnam Academy of Science and Technology
| | - Tuan Thanh Dang
- Faculty of Chemistry, Hanoi University of Science, Vietnam National University (VNU)
| | - Peter Langer
- Institut für Chemie, Universität Rostock
- Leibniz Institut für Katalyse an der Universität Rostock e.V
| | - Ha Nam Do
- Faculty of Chemistry, Hanoi University of Science, Vietnam National University (VNU)
| | - Nguyen Minh Quan
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology
| | - Ban Van Phuc
- Institute of Chemistry, Vietnam Academy of Science and Technology
| | | | | | | | - Van Tuyen Nguyen
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology
- Institute of Chemistry, Vietnam Academy of Science and Technology
| |
Collapse
|
11
|
Temesgen AW, Luong MD, Truong HH, Nguyen VT, Dang TTA, Le TA, Tskhovrebov AG, Khrustalev VN. Unexpected synthesis and crystal structure of N-{2-[2-(2-acetyl-ethen-yl)phen-oxy]eth-yl}- N-ethenyl-4-methyl-benzene-sulfonamide. Acta Crystallogr E Crystallogr Commun 2020; 76:1851-1853. [PMID: 33520267 PMCID: PMC7784650 DOI: 10.1107/s2056989020015194] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 11/15/2020] [Indexed: 11/10/2022]
Abstract
The title compound, C21H23NO4S, obtained by alkaline treatment of 1,5-bis-(1-phen-oxy)-3-aza-pentane at moderate heating, is a N-tosyl-ated secondary vinyl-amine. An intra-molecular S=O⋯H-C hydrogen bond generates a 13-membered ring. The benzalacetone moiety adopts a trans conformation with respect to the C=C double bond, which is slightly longer than usual due to the conjugation with a neighbouring acetyl group. Theoretical predictions of potential biological activities were performed, suggesting that the title compound can inhibit gluconate 2-de-hydrogenase (85% probability), as well as to act as a mucomembranous protector (73%).
Collapse
Affiliation(s)
- Ayalew W. Temesgen
- Department of Chemistry, College of Natural and Computational Sciences, University of Gondar, 196 Gondar, Ethiopia
| | - Minh Duc Luong
- Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi, 334 Nguyen Trai, Hanoi, 100000, Vietnam
| | - Hong Hieu Truong
- Faculty of Science, Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya, Moscow, 117198, Russian Federation
| | - Van Tuyen Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc, Viet, Hanoi, Vietnam
| | - Thi Tuyet Anh Dang
- Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc, Viet, Hanoi, Vietnam
| | - Tuan Anh Le
- Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi, 334 Nguyen Trai, Hanoi, 100000, Vietnam
| | - Alexander G. Tskhovrebov
- Faculty of Science, Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya, Moscow, 117198, Russian Federation
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of, Sciences, Kosygina 4, Moscow, Russian Federation
| | - Victor N. Khrustalev
- Faculty of Science, Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya, Moscow, 117198, Russian Federation
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prosp., Moscow 119991, Russian Federation
| |
Collapse
|
12
|
Zinoveva AD, Borisova TN, Politova PA, Titov AA, Varlamov AV, Voskressensky LG, Nguyen VT, Le TA. Facile Synthesis and Biological Evaluation of New Thieno[2,3‐g]indolizine Derivatives. ChemistrySelect 2020. [DOI: 10.1002/slct.202002684] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Anna D. Zinoveva
- Organic Chemistry Department Peoples' Friendship University of Russia (RUDN University) 6 Miklukho-Maklaya St Moscow 117198 Russian Federation
| | - Tatiana N. Borisova
- Organic Chemistry Department Peoples' Friendship University of Russia (RUDN University) 6 Miklukho-Maklaya St Moscow 117198 Russian Federation
| | - Polina A. Politova
- Organic Chemistry Department Peoples' Friendship University of Russia (RUDN University) 6 Miklukho-Maklaya St Moscow 117198 Russian Federation
| | - Alexander A. Titov
- Organic Chemistry Department Peoples' Friendship University of Russia (RUDN University) 6 Miklukho-Maklaya St Moscow 117198 Russian Federation
| | - Alexey V. Varlamov
- Organic Chemistry Department Peoples' Friendship University of Russia (RUDN University) 6 Miklukho-Maklaya St Moscow 117198 Russian Federation
| | - Leonid G. Voskressensky
- Organic Chemistry Department Peoples' Friendship University of Russia (RUDN University) 6 Miklukho-Maklaya St Moscow 117198 Russian Federation
| | - Van Tuyen Nguyen
- Institute of Chemistry Graduate University of Science and Technology Vietnam Academy of Science and Technology N. 18, Hoang Quoc Viet street, Can Giay Hanoi 100 000 Vietnam
| | - Tuan Anh Le
- Faculty of Chemistry VNU University of Science N. 19, Le Tong street Hanoi 100 000 Vietnam
| |
Collapse
|
13
|
Atopkin DM, Besprozvannykh VV, Ha DN, Nguyen VH, Nguyen VT. New species and new genus of Pseudohaploporinae (Digenea): Pseudohaploporus pusitestis sp. n. and Parahaploporus elegantus n. g., sp. n. (Digenea: Pseudohaploporinae) from Vietnamese mullet fish. Parasitol Int 2019; 75:102023. [PMID: 31715266 DOI: 10.1016/j.parint.2019.102023] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 11/04/2019] [Accepted: 11/07/2019] [Indexed: 11/17/2022]
Abstract
Two new species of Pseudohaploporinae, Pseudohaploporus pusitestis sp. n. and Parahaploporus elegantus n. g., sp. n., are described from intestines of the Vietnamese mullet fish Moolgarda seheli and Osteomugil cunnesius, respectively. Pseudohaploporus pusitestis sp. n. differs from two known Pseudohaploporus species, P. vietnamensis and P. planiliza, by the absence of a diverticulate hermaphroditic duct and muscular sphincters at the proximal end of the hermaphroditic sac. Metrically, P. pusitestis sp. n. is close to P. vietnamensis and differs from this species and from P. planilizum by lower maximum sizes of most parameters. Parahaploporus elegantus n. g., sp. differs from representatives of Pseudohaploporus by the presence of a single testis and the armament of hermaphroditic duct and is morphologically close to trematodes of the genus Haploporus. However, P. elegantus n. g differs from all known Haploporus species from mugilids of the Indo-West Pacific by the structure of the armament of the hermaphroditic duct and also by size of body, organs and eggs. The validity of designating two new species and a new genus of trematodes is supported by ITS and 28S rDNA sequence data. Phylogenetic reconstructions showed that the new trematodes belong to the Pseudohaploporinae, which formed a well-supported cluster within the monophyletic Haploporidae.
Collapse
Affiliation(s)
- D M Atopkin
- Federal Scientific Center of East Asia Terrestrial Biodiversity, Far Eastern Branch of Russian Academy of Sciences, 690022 Vladivostok, Russia; Department of Cell Biology and Genetics, Far Eastern Federal University, 690051, Ajax-10 str, Vladivostok, Russia.
| | - V V Besprozvannykh
- Federal Scientific Center of East Asia Terrestrial Biodiversity, Far Eastern Branch of Russian Academy of Sciences, 690022 Vladivostok, Russia
| | - D N Ha
- Institute of Ecology and Biological Resources, Vietnamese Academy of Sciences and Technology, Hanoi, Viet Nam
| | - V H Nguyen
- Institute of Ecology and Biological Resources, Vietnamese Academy of Sciences and Technology, Hanoi, Viet Nam
| | - V T Nguyen
- Hai Duong Medical Technical University, Hanoi, Viet Nam
| |
Collapse
|
14
|
Abstract
The ethylacetate extracts produced from the leaves of Stixis suaveolens (Roxb.) was characterized on the basis of NMR spectra combined with extensive mass spectroscopic techniques. The chemical characterization revealed presence of two new phenolic amides which were named as stixilamides A and B.
Collapse
Affiliation(s)
- Quoc Anh Ngo
- Institute of Chemistry, Vietnam Academy of Science and Technology, Hanoi, Viet Nam
| | - Thi Yen Tran
- Institute of Chemistry, Vietnam Academy of Science and Technology, Hanoi, Viet Nam
| | - Thuy Hang Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology, Hanoi, Viet Nam
| | - Van Tuyen Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology, Hanoi, Viet Nam
| | - Hong Anh Duong
- Centre for Environmental Technology and Sustainable Development (CETASD), VNU University of Science, Hanoi, Viet Nam
| | - Hung Viet Pham
- Centre for Environmental Technology and Sustainable Development (CETASD), VNU University of Science, Hanoi, Viet Nam
| |
Collapse
|
15
|
Polito U, Modina SC, Di Giancamillo A, Nguyen VT, Peretti GM. Decorin age-related variations in the distribution of pig extracellular matrix meniscus. J BIOL REG HOMEOS AG 2019; 33:119-124. XIX Congresso Nazionale S.I.C.O.O.P. Societa' Italiana Chirurghi Ortopedici Dell'ospedalita' Privata Accreditata. [PMID: 31169013] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Menisci act like shock absorbers and transmit load across the tibiofemoral joint by increasing congruency during movements or body weight load. This leads to decreasing the resultant stress on the articular cartilages. The meniscus has a dense extracellular matrix (ECM) composed of water, different types of collagens, and proteoglycans, such as decorin, aggrecan and biglycan. Decorin (DCN) regulates collagen fibrillogenesis acting on collagen fibrils diameter and fibrils orientation to achieve the proper assembly of its network. This work investigates the spatial disposition of this fundamental protein in pig meniscus' matrix by immunohistochemistry and western blot analysis. DCN shows an increasing trend, moving from neonatal to adult pig menisci. Adult meniscus, in porcine species, is the only one that could be considered fully mature and functional, and, even if an increasing trend is seen, no precise phenotypical switch points are seen in the age stages considered in this study.
Collapse
Affiliation(s)
- U Polito
- Departments of Health, Animal Science and Food Safety, University of Milan, Milan, Italy
| | - S C Modina
- Departments of Health, Animal Science and Food Safety, University of Milan, Milan, Italy
| | - A Di Giancamillo
- Departments of Health, Animal Science and Food Safety, University of Milan, Milan, Italy
| | - V T Nguyen
- IRCCS Istituto Ortopedico Galeazzi, Milan, Italy
| | - G M Peretti
- IRCCS Istituto Ortopedico Galeazzi, Milan, Italy
- Department of Biomedical Sciences for Health, University of Milan, Italy
| |
Collapse
|
16
|
Nguyen VT, Superchi C, Boutron I. 2-Year outcome from two parallel randomized controlled trials. Reporting considerations. Osteoarthritis Cartilage 2019; 27:e3-e4. [PMID: 30576793 DOI: 10.1016/j.joca.2018.10.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Accepted: 10/24/2018] [Indexed: 02/02/2023]
Affiliation(s)
- V T Nguyen
- INSERM METHODS Team UMR1153, Université Paris Descartes, France; University of Liverpool, United Kingdom
| | - C Superchi
- INSERM METHODS Team UMR1153, Université Paris Descartes, France; Barcelona-Tech, Spain
| | - I Boutron
- INSERM METHODS Team UMR1153, Université Paris Descartes, France.
| |
Collapse
|
17
|
Titov AA, Samavati R, Alexandrova EV, Borisova TN, Dang Thi TA, Nguyen VT, Le TA, Varlamov AV, Van der Eycken EV, Voskressensky LG. Synthesis of 1-( para-methoxyphenyl)tetrazolyl-Substituted 1,2,3,4-Tetrahydroisoquinolines and Their Transformations Involving Activated Alkynes. Molecules 2018; 23:molecules23113010. [PMID: 30453635 PMCID: PMC6278526 DOI: 10.3390/molecules23113010] [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] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 11/10/2018] [Accepted: 11/15/2018] [Indexed: 11/16/2022] Open
Abstract
1-(p-Methoxyphenyl)tetrazolyl-substituted 6,7-dimethoxy(6,7-methylenedioxy)-1,2,3,4-tetrahydroisoquinolines formed tetrazolyl-substituted azocines in high yields by using activated alkynes. Unsubstituted at 6,7,8-aromatic fragment 1-tetrazolylisoquinoline interacted in several pathways forming tetrazolyl-substituted azocines, 1-tetrazolyl-1-R-vinylisoquinolines and 3-azaspiro[5.5]undeca-1,7,9-triene.
Collapse
Affiliation(s)
- Alexander A Titov
- Organic Chemistry Department, Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya St., 117198 Moscow, Russia.
| | - Reza Samavati
- Organic Chemistry Department, Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya St., 117198 Moscow, Russia.
| | - Elena V Alexandrova
- Organic Chemistry Department, Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya St., 117198 Moscow, Russia.
| | - Tatiana N Borisova
- Organic Chemistry Department, Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya St., 117198 Moscow, Russia.
| | - Tuyet Anh Dang Thi
- Institute of Chemistry of Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam.
| | - Van Tuyen Nguyen
- Institute of Chemistry of Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam.
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi 100000, Vietnam.
| | - Tuan Anh Le
- Faculty of Chemistry of VNU University of Science, 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Vietnam.
| | - Alexey V Varlamov
- Organic Chemistry Department, Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya St., 117198 Moscow, Russia.
| | - Erik V Van der Eycken
- Organic Chemistry Department, Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya St., 117198 Moscow, Russia.
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, KU Leuven Celestijnenlaan 200F, 3001 Leuven, Belgium.
| | - Leonid G Voskressensky
- Organic Chemistry Department, Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya St., 117198 Moscow, Russia.
| |
Collapse
|
18
|
Tessaro I, Di Giancamillo A, Benasciutti E, Nguyen VT, Polito U, Mangiavini L, Peretti GM. Characterization of different in vitro culture conditions to induce a fibro-chondrogenic differentiation of swine adipose-derived stem cells. J BIOL REG HOMEOS AG 2018; 32:97-103. [PMID: 30644289] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Meniscus repair is still a challenge for orthopaedic surgeons as this tissue has a scarce healing potential due to the limited vascularization and to the lack of progenitor cells. Lately, several tissue engineering strategies combining cells and scaffolds have been developed. Adipose-derived stem cells (ASCs) represent a novel cell source for meniscus repair as they are easy to harvest, and they possess an intrinsic chondrogenic potential. The aim of our study was to analyze and compare the chondrogenic differentiation of swine ASCs cultured in vitro with different supplemented media. We isolated ASCs from swine adipose tissue and we placed in pellet cultures supplemented with either Bone Morphogenetic Protein (BMP)-2 and Transforming Growth Factor (TGF)-β3 or with Bone Morphogenetic Protein (BMP)-7 and Transforming Growth Factor (TGF)-β1. Samples were analyzed after 7, 14 or 21 days of culture by biochemical, histological and gene expression analysis. Our preliminary results show that BMP-2 and TGF-β3 are stronger inducers of chondrogenesis.
Collapse
Affiliation(s)
- I Tessaro
- IRCCS Istituto Ortopedico Galeazzi, Milano, Italy
| | - A Di Giancamillo
- Department of Health, Animal Science and Food Safety, University of Milan, Italy
| | | | - V T Nguyen
- IRCCS Istituto Ortopedico Galeazzi, Milano, Italy
| | - U Polito
- Department of Health, Animal Science and Food Safety, University of Milan, Italy
| | - L Mangiavini
- IRCCS Istituto Ortopedico Galeazzi, Milano, Italy
| | - G M Peretti
- IRCCS Istituto Ortopedico Galeazzi, Milano, Italy
- Department of Biomedical Sciences for Health, University of Milan, Milano, Italy
| |
Collapse
|
19
|
Tessaro I, Nguyen VT, Di Giancamillo A, Agnoletto M, Verdoni F, Domenicucci M, Scurati R, Peretti GM, Mangiavini L. Animal models for cartilage repair. J BIOL REG HOMEOS AG 2018; 32:105-116. [PMID: 30644290] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Cartilage lesions still represent an unsolved problem: despite the efforts of the basic and translational research, the regeneration of this tissue is far from being reached (1-3). Articular cartilage lesions can be divided in two main groups: superficial or partial defects and full-thickness defects (4, 5). Partial lesions are not able to self-heal because multipotent cells from the bone marrow cannot reach the area leading to a progressive degeneration of the tissue (6). Conversely, full-thickness injuries possess greater chances to heal because subchondral bone involvement allows for the migration of mesenchymal cells, which fill the damaged area (7, 8). However, healing occurs through the formation of a fibrocartilaginous tissue, which has different biomechanical and biological properties (9). Native hyaline cartilage has indeed specific biomechanical properties, which confer resistance to compressive and shear stresses; the reparative fibrocartilaginous tissue lacks these abilities, therefore, the surrounding healthy cartilage progressively degenerates. In the past years, several therapeutic strategies have been developed to restore the damaged cartilage, bone marrow stimulation (chondroabrasion, drilling, micro- or nano-fractures) and more recently, tissue engineering approaches (10-14). Some of these latter procedures have already been applied in clinical practice such as matrix-induced autologous chondrocyte implantation (MACI) (15) or osteochondral scaffold implantation (16). Generally, tissue engineering approaches are based on the combination of three main elements: cells (i.e. primary chondrocytes or multipotent mesenchymal cells), biocompatible scaffolds (i.e. polymers, composites, ceramics) and signaling molecules (i.e. growth factors). Moreover, several culture conditions (i.e. static or dynamic cultures) and biomechanical stimuli can be applied during the in vitro culture to promote tissue maturation (17-19). However, an in vivo culture is mandatory to validate a new engineered construct as the in vitro phase lacks the essential in vivo environmental stimuli and because the in vivo culture allows for the testing of the biocompatibility and safety of a new material (18, 19). Moreover, preclinical animal models are crucial to understand the molecular mechanisms of cartilage lesions favoring the development of new regenerative strategies (20, 21). in vivo studies on animal models should focus on the analysis of the cellular component, analyzing the maintenance of the cellular phenotype and the tumorigenicity; on the evaluation of the biocompatibility, toxicity and degradation of the biomaterial and on the assessment of the engineered construct. In this manuscript, we will review the most common preclinical animal models, which are used to understand cartilage biology and therefore to develop new tissue engineering strategies. We will focus on both small and large animal models highlighting their peculiarities, advantages and drawbacks.
Collapse
Affiliation(s)
- I Tessaro
- IRCCS Istituto Ortopedico Galeazzi, Milano, Italy
| | - V T Nguyen
- IRCCS Istituto Ortopedico Galeazzi, Milano, Italy
| | - A Di Giancamillo
- Department of Health, Animal Science and Food Safety, University of Milan, Italy
| | - M Agnoletto
- IRCCS Istituto Ortopedico Galeazzi, Milano, Italy
| | - F Verdoni
- IRCCS Istituto Ortopedico Galeazzi, Milano, Italy
| | - M Domenicucci
- Residency Program in Orthopaedics and Traumatology, University of Milan, Milano, Italy
| | - R Scurati
- Department of Biomedical Sciences for Health, University of Milan, Milano, Italy
| | - G M Peretti
- IRCCS Istituto Ortopedico Galeazzi, Milano, Italy
- Department of Biomedical Sciences for Health, University of Milan, Milano, Italy
| | - L Mangiavini
- IRCCS Istituto Ortopedico Galeazzi, Milano, Italy
| |
Collapse
|
20
|
Nguyen VT, Edmonds SW, Lou Y, Roblin DW, Saag KG, Cram P, Wolinsky FD. Validity, reliability, and responsiveness to change of the "Osteoporosis and You" knowledge scale. Osteoporos Int 2017; 28:3379-3388. [PMID: 28879445 PMCID: PMC5685910 DOI: 10.1007/s00198-017-4204-z] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 08/21/2017] [Indexed: 10/18/2022]
Abstract
We studied the Osteoporosis and You knowledge scale in 7749 participants enrolled in a clinical trial. Results confirmed its psychometric properties in a diverse audience. Baseline scores were associated with better recall of bone mineral density test results at follow-up; however, the scale was not responsive to knowledge change. INTRODUCTION The goal of this study was to confirm the measurement properties of the Osteoporosis and You (O&Y) knowledge scale using classic test theory methods in the 7749 men and women participating in the Patient Activation After DXA Result Notification (PAADRN) randomized controlled trial. We hypothesized a simple factor structure that would reflect the four-factor model previously published. METHODS We conducted psychometric analyses which included item analysis, internal consistency reliability, construct validity using exploratory and confirmatory factor analysis (EFA and CFA), comparing knowledge levels across pre-specified groups, and responsiveness to change. RESULTS PAADRN participants were predominantly college educated, White females with low bone density, and a moderate level of 10-year fracture risk. EFA revealed four domains closely matching those in two previous reports. While overall scale reliability was minimally acceptable at 0.68, the reliabilities of the domain subscales were unacceptably low (0.59, 0.64, 0.45, and 0.36 for the Biological, Lifestyle, Consequences, and Prevention and Treatment subscales). CFA revealed the data fit the hypothesized model reasonably well with the items loading on their expected latent variable. The scale was not responsive to change, but although not significant, improved knowledge indicated better DXA result recall at 12 and 52 weeks. CONCLUSIONS In the PAADRN population, the O&Y knowledge scale had psychometric properties similar to those previously reported. Over 12 and 52 weeks, participants did not demonstrate significant changes in knowledge, but those with higher knowledge at baseline were more likely to accurately recall their baseline DXA result.
Collapse
Affiliation(s)
- V T Nguyen
- College of Public Health, University of Iowa, 5233 Westlawn, Iowa City, IA, 52242, USA.
| | - S W Edmonds
- College of Nursing, University of Iowa, Iowa City, IA, USA
- CADRE, Iowa City VA Health System, Iowa City, IA, USA
| | - Y Lou
- College of Public Health, University of Iowa, 5233 Westlawn, Iowa City, IA, 52242, USA
| | - D W Roblin
- Kaiser Permanente of Atlanta, Atlanta, GA, USA
- School of Public Health, Georgia State University, Atlanta, GA, USA
| | - K G Saag
- School of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - P Cram
- Faculty of Medicine, University of Toronto, Toronto, ONT, Canada
- University Health Network and Mount Sinai Hospital, Toronto, ONT, Canada
| | - F D Wolinsky
- College of Public Health, University of Iowa, 5233 Westlawn, Iowa City, IA, 52242, USA
- College of Nursing, University of Iowa, Iowa City, IA, USA
- College of Medicine, University of Iowa, Iowa City, IA, USA
| |
Collapse
|
21
|
Nguyen VT, Sorokina EA, Listratova AV, Voskressensky LG, Lobanov NN, Dorovatovskii PV, Zubavichus YV, Khrustalev VN. Ring-expansion synthesis and crystal structure of dimethyl 4-ethyl-1,4,5,6,7,8-hexa-hydro-azonino[5,6- b]indole-2,3-di-carboxyl-ate. Acta Crystallogr E Crystallogr Commun 2017; 73:338-340. [PMID: 28316803 PMCID: PMC5347048 DOI: 10.1107/s205698901700161x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 01/31/2017] [Indexed: 11/15/2022]
Abstract
The nine-membered azoninoindole ring in the title compound arose from a ring-expansion reaction. The title compound shows acetylcholinesterase and butyrylcholinesterase inhibition. The title compound, C20H24N2O4, is the product of a ring-expansion reaction from a seven-membered hexahydroazepine to a nine-membered azonine. The azonine ring of the molecule adopts a chair–boat conformation. In the crystal, molecules are linked by bifurcated N—H⋯(O,O) hydrogen bonds, generating [010] zigzag chains. The title compound shows inhibitory activity against acetylcholinesterase and butyrylcholinesterase, and might be considered as a candidate for the design of new types of anti-Alzheimer’s drugs.
Collapse
Affiliation(s)
- Van Tuyen Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam; Graduate University of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam
| | - Elena A Sorokina
- Organic Chemistry Department, Peoples' Friendship University of Russia, 6 Miklukho-Maklaya St., Moscow 117198, Russian Federation
| | - Anna V Listratova
- Organic Chemistry Department, Peoples' Friendship University of Russia, 6 Miklukho-Maklaya St., Moscow 117198, Russian Federation
| | - Leonid G Voskressensky
- Organic Chemistry Department, Peoples' Friendship University of Russia, 6 Miklukho-Maklaya St., Moscow 117198, Russian Federation
| | - Nikolai N Lobanov
- Inorganic Chemistry Department, Peoples' Friendship University of Russia, 6 Miklukho-Maklaya St., Moscow 117198, Russian Federation
| | - Pavel V Dorovatovskii
- National Research Centre "Kurchatov Institute", 1 Acad. Kurchatov Sq., Moscow 123182, Russian Federation
| | - Yan V Zubavichus
- National Research Centre "Kurchatov Institute", 1 Acad. Kurchatov Sq., Moscow 123182, Russian Federation
| | - Victor N Khrustalev
- Inorganic Chemistry Department, Peoples' Friendship University of Russia, 6 Miklukho-Maklay St., Moscow 117198, Russian Federation; X-Ray Structural Centre, A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov St., B-334, Moscow 119991, Russian Federation
| |
Collapse
|
22
|
Nguyen LA, Do DH, Nguyen LT, Do NT, Nguyen HH, Nguyen VT, Vu DQ, Nguyen HT, Kato M, Jordan MR, Bui DD. A13 HIV drug resistance over a decade of antiretroviral therapy scale-up for HIV/AIDS patients in Vietnam. Virus Evol 2017; 3:vew036.012. [PMID: 28845273 PMCID: PMC5565985 DOI: 10.1093/ve/vew036.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- L A Nguyen
- National Institute of Hygiene and Epidemiology, Vietnam
| | - D H Do
- National Institute of Hygiene and Epidemiology, Vietnam
| | - L T Nguyen
- National Institute of Hygiene and Epidemiology, Vietnam
| | - N T Do
- Vietnam Authority for HIV AIDS Control
| | | | | | - D Q Vu
- Hanoi Medical University, Vietnam
| | - H T Nguyen
- National Institute of Hygiene and Epidemiology, Vietnam
| | - M Kato
- World Health Organization, Vietnam
| | - M R Jordan
- Tuffs University School of Medicine, Massachusetts, USA
| | - D D Bui
- Vietnam Authority for HIV AIDS Control
| |
Collapse
|
23
|
Nguyen VT, Truong HH, Le TA, Soldatenkov AT, Thi TAD, Tran TTV, Esina NY, Khrustalev VN. Crystal structure of 22,24,25-trimethyl-8,11,14-trioxa-25-aza-tetra-cyclo-[19.3.1.0 2,7.0 15,20]penta-cosa-2,4,6,15(20),16,18-hexaen-23-one. Acta Crystallogr E Crystallogr Commun 2017; 73:118-121. [PMID: 28217324 PMCID: PMC5290547 DOI: 10.1107/s2056989016020508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Accepted: 12/25/2016] [Indexed: 11/10/2022]
Abstract
The title compound, C24H29NO4, is the product of a Petrenko-Kritchenko condensation of 1,5-bis-(2-formyl-phen-oxy)-3-oxa-pentane, pentan-3-one and methyl-ammonium acetate in ethanol. The mol-ecule has mirror symmetry. The aza-14-crown-3 ether ring adopts a bowl conformation stabilized by a weak intra-molecular C-H⋯O hydrogen bond. The conformation of the C-O-C-C-O-C-C-O-C polyether chain is t-g+-t-t-g--t (t = trans, 180°; g = gauche, ±60°). The dihedral angle between the benzene rings fused to the aza-14-crown-4-ether moiety is 72.68 (4)°. The piperidinone ring adopts a chair conformation. The nitro-gen atom has a trigonal-pyramidal geometry, the sum of the bond angles being 335.9°. In the crystal, the mol-ecules are linked by weak C-H⋯O inter-actions, forming zigzag chains propagating along the [100] direction.
Collapse
Affiliation(s)
- Van Tuyen Nguyen
- Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam
- Graduate University of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam
| | - Hong Hieu Truong
- Department of Biotechnology, Vietnam–Russia Tropical Centre, 58 Nguyen Van Huyen, Hanoi, Vietnam
| | - Tuan Anh Le
- Faculty of Chemistry, VNU University of Science, Vietnam National University, 19 Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam
| | - Anatoly T. Soldatenkov
- Organic Chemistry Department, Peoples’ Friendship University of Russia, 6 Miklukho-Maklaya St., Moscow 117198, Russian Federation
| | - Tuyet Anh Dang Thi
- Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam
| | - Thi Thanh Van Tran
- Faculty of Chemistry, VNU University of Science, Vietnam National University, 19 Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam
| | - Natalia Ya. Esina
- Inorganic Chemistry Department, Peoples’ Friendship University of Russia, 6 Miklukho-Maklay St., Moscow 117198, Russian Federation
| | - Victor N. Khrustalev
- Inorganic Chemistry Department, Peoples’ Friendship University of Russia, 6 Miklukho-Maklay St., Moscow 117198, Russian Federation
- X-Ray Structural Centre, A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov St., B-334, Moscow 119991, Russian Federation
| |
Collapse
|
24
|
Pang J, Nguyen VT, Rhodes DH, Sullivan ME, Braunschweig C, Fantuzzi G. Relationship of galectin-3 with obesity, IL-6, and CRP in women. J Endocrinol Invest 2016; 39:1435-1443. [PMID: 27444618 DOI: 10.1007/s40618-016-0515-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 07/12/2016] [Indexed: 01/07/2023]
Abstract
PURPOSE To evaluate the association of galectin-3 (Gal3) with obesity and inflammatory status in a cohort of metabolically healthy, predominantly African-American women with varying cardiovascular disease (CVD) risk as determined by CRP levels. METHODS We assessed the association between BMI and serum levels of Gal3, IL-6, CRP, and adiponectin in metabolically healthy women (N = 97) to determine the overall association between Gal3, obesity, and inflammation in groups at different CVD risk. RESULTS Obese women had significantly higher serum Gal3 compared to non-obese participants (P = 0.0016), although Gal3 levels were comparable among different classes of obesity. BMI (R 2 = 0.1406, P = 0.0013), IL-6 (R 2 = 0.0689, P = 0.035), and CRP (R 2 = 0.0468, P = 0.0419), but not adiponectin, positively predicted the variance of Gal3 levels in the total study population. However, the predicting effect of BMI (R 2 = 0.2923, P = 0.0125) and inflammation (R 2 = 0.3138, P = 0.038) on Gal3 was only present in women at low/moderate risk of CVD (CRP ≤ 3 µg/mL). CONCLUSIONS Gal3 is positively correlated with obesity and inflammation in women, while the presence of elevated CVD risk may disturb the strength of Gal3 as a biomarker of inflammation.
Collapse
Affiliation(s)
- J Pang
- Department of Kinesiology and Nutrition, University of Illinois at Chicago, 1919 W Taylor Street, Chicago, IL, 60612, USA
| | - V T Nguyen
- Department of Kinesiology and Nutrition, University of Illinois at Chicago, 1919 W Taylor Street, Chicago, IL, 60612, USA
| | - D H Rhodes
- Department of Kinesiology and Nutrition, University of Illinois at Chicago, 1919 W Taylor Street, Chicago, IL, 60612, USA
| | - M E Sullivan
- Department of Kinesiology and Nutrition, University of Illinois at Chicago, 1919 W Taylor Street, Chicago, IL, 60612, USA
| | - C Braunschweig
- Department of Kinesiology and Nutrition, University of Illinois at Chicago, 1919 W Taylor Street, Chicago, IL, 60612, USA
| | - G Fantuzzi
- Department of Kinesiology and Nutrition, University of Illinois at Chicago, 1919 W Taylor Street, Chicago, IL, 60612, USA.
| |
Collapse
|
25
|
Rotthier G, Cappoen D, Nguyen QT, Dang Thi TA, Mathys V, Nguyen VT, Huygen K, Maes L, Cos P, Abbaspour Tehrani K. Synthesis and anti-tubercular activity of N(2)-arylbenzo[g]isoquinoline-5,10-dione-3-iminium bromides. Org Biomol Chem 2016; 14:2041-51. [PMID: 26763748 DOI: 10.1039/c5ob02138c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tuberculosis has remained a challenge for medicinal chemists worldwide. In the framework of a collaborative program to identify and evaluate novel antitubercular candidate compounds, the biological properties of benzo[g]isoquinoline-5,10-diones have been found to be very promising. In this paper we have further expanded the library by incorporation of an amidinium moiety into the benzo[g]isoquinoline-5,10-dione scaffold. The presence of this functional group also increased the solubility of the quinones in polar solvents. To this purpose N(2)-arylbenzo[g]isoquinoline-5,10-dione-3-iminium bromides were synthesized in a straightforward way by means of a reaction of anilines with 2-(bromomethyl)-3-(cyanomethyl)-1,4-dimethoxynaphthalene. Following the biological evaluation, N(2)-(4-chlorophenyl)-5,10-dioxobenzo[g]isoquinoline-3(2H)-iminium bromide (MIC = 1.16 μM, CC50 = 28.51 μM, SI = 24.58) was selected as the most promising representative. Apart from the nano-molar anti-mycobacterial activity, the compound was able to target intracellular residing Mycobacterium tuberculosis and the susceptibility of a multi-drug-resistant strain towards the compound was confirmed.
Collapse
Affiliation(s)
- G Rotthier
- Organic Synthesis, Faculty of Sciences, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
| | - D Cappoen
- Laboratory of Microbiology, Parasitology and Hygiene (LMPH), S7, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium and Scientific Service Immunology, O.D. Communicable & Infectious Diseases, Scientific Institute of Public Health (Site Ukkel), Engelandstraat 642, B-1180 Ukkel, Belgium
| | - Quang Trung Nguyen
- Institute of Chemistry, Vietnam Academy of Sciences and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam
| | - Tuyet Anh Dang Thi
- Institute of Chemistry, Vietnam Academy of Sciences and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam
| | - V Mathys
- Program Tuberculosis and Mycobacteria, Service Bacterial Diseases, O.D. Communicable & Infectious Diseases, Scientific Institute of Public Health (Site Ukkel), Engelandstraat 642, B-1180 Ukkel, Belgium
| | - Van Tuyen Nguyen
- Institute of Chemistry, Vietnam Academy of Sciences and Technology, 18-Hoang Quoc Viet, Cau Giay, Ha Noi, Vietnam
| | - K Huygen
- Scientific Service Immunology, O.D. Communicable & Infectious Diseases, Scientific Institute of Public Health (Site Ukkel), Engelandstraat 642, B-1180 Ukkel, Belgium
| | - L Maes
- Laboratory of Microbiology, Parasitology and Hygiene (LMPH), S7, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - P Cos
- Laboratory of Microbiology, Parasitology and Hygiene (LMPH), S7, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - K Abbaspour Tehrani
- Organic Synthesis, Faculty of Sciences, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
| |
Collapse
|
26
|
Guo CC, Hyett MP, Nguyen VT, Parker GB, Breakspear MJ. Distinct neurobiological signatures of brain connectivity in depression subtypes during natural viewing of emotionally salient films. Psychol Med 2016; 46:1535-1545. [PMID: 26888415 DOI: 10.1017/s0033291716000179] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
BACKGROUND Establishing an evidence-based diagnostic system informed by the biological (dys)function of the nervous system is a major priority in psychiatry. This objective, however, is often challenged by difficulties in identifying homogeneous clinical populations. Melancholia, a biological and endogenous subtype for major depressive disorder, presents a canonical test case in the search of biological nosology. METHOD We employed a unique combination of naturalistic functional magnetic resonance imaging (fMRI) paradigms - resting state and free viewing of emotionally salient films - to search for neurobiological signatures of depression subtypes. fMRI data were acquired from 57 participants; 17 patients with melancholia, 17 patients with (non-melancholic) major depression and 23 matched healthy controls. RESULTS Patients with melancholia showed a prominent loss of functional connectivity in hub regions [including ventral medial prefrontal cortex, anterior cingulate cortex (ACC) and superior temporal gyrus] during natural viewing, and in the posterior cingulate cortex while at rest. Of note, the default mode network showed diminished reactivity to external stimuli in melancholia, which correlated with the severity of anhedonia. Intriguingly, the subgenual ACC, a potential target for treating depression with deep brain stimulation (DBS), showed divergent changes between the two depression subtypes, with increased connectivity in the non-melancholic and decreased connectivity in the melancholic subsets. CONCLUSION These findings reveal neurobiological changes specific to depression subtypes during ecologically valid behavioural conditions, underscoring the critical need to respect differing neurobiological processes underpinning depressive subtypes.
Collapse
Affiliation(s)
- C C Guo
- QIMR Berghofer Medical Research Institute,Herston, QLD,Australia
| | - M P Hyett
- QIMR Berghofer Medical Research Institute,Herston, QLD,Australia
| | - V T Nguyen
- QIMR Berghofer Medical Research Institute,Herston, QLD,Australia
| | - G B Parker
- School of Psychiatry, University of New South Wales,Sydney,Australia
| | - M J Breakspear
- QIMR Berghofer Medical Research Institute,Herston, QLD,Australia
| |
Collapse
|
27
|
Ngo QA, Nguyen LA, Vo NB, Nguyen TH, Roussi F, Nguyen TH, Nguyen VT. Synthesis and antiproliferativeactivity of new vinca alkaloids containing an α,β-unsaturated aromatic side chain. Bioorg Med Chem Lett 2015; 25:5597-600. [DOI: 10.1016/j.bmcl.2015.10.040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 10/12/2015] [Accepted: 10/15/2015] [Indexed: 12/17/2022]
|
28
|
Voskressensky LG, Storozhenko OA, Festa AA, Khrustalev VN, Dang TTA, Nguyen VT, Varlamov AV. A novel domino condensation—intramolecular nucleophilic cyclization approach toward annulated imidazo-pyrrolopyridines. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.10.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
29
|
Dang TTA, Pham TC, Ngo QA, Vu TTH, Nguyen TD, Doan DT, Ba TC, Jean M, van de Weghe P, Nguyen VT. Synthesis of new bioisosteric hemiasterlin analogues with extremely high cytotoxicity. Bioorg Med Chem Lett 2014; 24:5216-8. [PMID: 25442315 DOI: 10.1016/j.bmcl.2014.09.065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Revised: 09/22/2014] [Accepted: 09/24/2014] [Indexed: 11/25/2022]
Abstract
In this Letter, the synthesis and the evaluation of the cytotoxicity of new hemiasterlin analogues were reported. The indole moiety was replaced respectively by benzofurane, naphthalene and 4-bromobenzene groups. Most of these derivatives possess strong cytotoxic activity on two human tumour cell lines (KB and Hep-G2), and some analogues showed comparable cytotoxic activity to that observed for paclitaxel and ellipticine, against KB and Hep-G2 cancer cell lines.
Collapse
Affiliation(s)
- Thi Tuyet Anh Dang
- Institute of Chemistry-Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam
| | - The Chinh Pham
- Institute of Chemistry-Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam
| | - Quoc Anh Ngo
- Institute of Chemistry-Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam
| | - Thi Thu Ha Vu
- Institute of Chemistry-Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam
| | - Tien Dung Nguyen
- Institute of Chemistry-Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam
| | - Duy Tien Doan
- Institute of Chemistry-Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam
| | - Thi Cham Ba
- Institute of Chemistry-Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam
| | - M Jean
- Equipe Produits Naturels, Synthèses et Chimie Médicinale (PNSCM), UMR CNRS 6226-Institut des Sciences Chimiques de Rennes, Université de Rennes 1, UFR Sciences Pharmaceutiques et Biologiques, 2, Avenue du Prof L. Bernard, F-35043 Rennes Cedex, France
| | - P van de Weghe
- Equipe Produits Naturels, Synthèses et Chimie Médicinale (PNSCM), UMR CNRS 6226-Institut des Sciences Chimiques de Rennes, Université de Rennes 1, UFR Sciences Pharmaceutiques et Biologiques, 2, Avenue du Prof L. Bernard, F-35043 Rennes Cedex, France.
| | - Van Tuyen Nguyen
- Institute of Chemistry-Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam.
| |
Collapse
|
30
|
Tran NH, Nguyen VT, Urase T, Ngo HH. Role of nitrification in the biodegradation of selected artificial sweetening agents in biological wastewater treatment process. Bioresour Technol 2014; 161:40-6. [PMID: 24681682 DOI: 10.1016/j.biortech.2014.02.116] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Revised: 02/22/2014] [Accepted: 02/24/2014] [Indexed: 05/21/2023]
Abstract
The biodegradation of the six artificial sweetening agents including acesulfame (ACE), aspartame (ASP), cyclamate (CYC), neohesperidindihydrochalcone (NHDC), saccharin (SAC), and sucralose (SUC) by nitrifying activated sludge was first examined. Experimental results showed that ASP and NHDC were the most easily degradable compounds even in the control tests. CYC and SAC were efficiently biodegraded by the nitrifying activated sludge, whereas ACE and SUC were poorly removed. However, the biodegradation efficiencies of the ASs were increased with the increase in initial ammonium concentrations in the bioreactors. The association between nitrification and co-metabolic degradation was investigated and a linear relationship between nitrification rate and co-metabolic biodegradation rate was observed for the target artificial sweeteners (ASs). The contribution of heterotrophic microorganisms and autotrophic ammonia oxidizers in biodegradation of the ASs was elucidated, of which autotrophic ammonia oxidizers played an important role in the biodegradation of the ASs, particularly with regards to ACE and SUC.
Collapse
Affiliation(s)
- N H Tran
- Department of Civil and Environmental Engineering, Faculty of Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore 117576, Singapore.
| | - V T Nguyen
- Department of Civil and Environmental Engineering, Faculty of Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore 117576, Singapore
| | - T Urase
- School of Bioscience and Biotechnology, Tokyo University of Technology, Katakura 1404-1, Hachioji, Tokyo 192-0982, Japan
| | - H H Ngo
- School of Civil and Environmental Engineering, University of Technology Sydney, PO Box 123, Broadway, NSW 2007, Australia
| |
Collapse
|
31
|
Versapuech JM, Kapfer J, Alaoui ACE, Nguyen VT. [Hyperplastic polyp arising in Barrett's esophagus]. ACTA ACUST UNITED AC 2010; 34:138-40. [PMID: 20133093 DOI: 10.1016/j.gcb.2009.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2009] [Revised: 11/08/2009] [Accepted: 11/15/2009] [Indexed: 11/17/2022]
|
32
|
Nguyen NT, Pham VC, Litaudon M, Guéritte F, Bodo B, Nguyen VT, Nguyen VH. Novel cyclopeptide and unique flavone from Desmos rostrata. Total synthesis of desmorostratone. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.06.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
33
|
Adamson P, Aguilar-Arevalo AA, Anderson CE, Bazarko AO, Bishai M, Brice SJ, Brown BC, Bugel L, Cao J, Choudhary BC, Coney L, Conrad JM, Cox DC, Curioni A, Djurcic Z, Finley DA, Fleming BT, Ford R, Gallagher HR, Garcia FG, Garvey GT, Green C, Green JA, Harris D, Hart TL, Hawker E, Hylen J, Imlay R, Johnson RA, Karagiorgi G, Kasper P, Katori T, Kobilarcik T, Kopp S, Kourbanis I, Koutsoliotas S, Laird EM, Linden SK, Link JM, Liu Y, Liu Y, Loiacono L, Louis WC, Marchionni A, Mahn KBM, Marsh W, McGregor G, Messier MD, Metcalf W, Meyers PD, Mills F, Mills GB, Monroe J, Moore CD, Nelson JK, Nelson RH, Nguyen VT, Nienaber P, Nowak JA, Ouedraogo S, Patterson RB, Pavlovic Z, Perevalov D, Polly CC, Prebys E, Raaf JL, Ray H, Roe BP, Russell AD, Sandberg V, Schirato R, Schmitz D, Shaevitz MH, Shoemaker FC, Smart W, Smith D, Sodeberg M, Sorel M, Spentzouris P, Stancu I, Stefanski RJ, Sung M, Tanaka HA, Tayloe R, Tzanov M, Vahle P, Van de Water R, Viren B, Wascko MO, White DH, Wilking MJ, Yang HJ, Yumiceva FX, Zeller GP, Zimmerman ED, Zwaska R. Measurement of numicro and nue events in an off-axis horn-focused neutrino beam. Phys Rev Lett 2009; 102:211801. [PMID: 19519094 DOI: 10.1103/physrevlett.102.211801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2008] [Indexed: 05/27/2023]
Abstract
We report the first observation of off-axis neutrino interactions in the MiniBooNE detector from the NuMI beam line at Fermilab. The MiniBooNE detector is located 745 m from the NuMI production target, at 110 mrad angle (6.3 degrees) with respect to the NuMI beam axis. Samples of charged-current quasielastic numicro and nue interactions are analyzed and found to be in agreement with expectation. This provides a direct verification of the expected pion and kaon contributions to the neutrino flux and validates the modeling of the NuMI off-axis beam.
Collapse
Affiliation(s)
- P Adamson
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Aguilar-Arevalo AA, Anderson CE, Bazarko AO, Brice SJ, Brown BC, Bugel L, Cao J, Coney L, Conrad JM, Cox DC, Curioni A, Djurcic Z, Finley DA, Fleming BT, Ford R, Garcia FG, Garvey GT, Green C, Green JA, Hart TL, Hawker E, Imlay R, Johnson RA, Karagiorgi G, Kasper P, Katori T, Kobilarcik T, Kourbanis I, Koutsoliotas S, Laird EM, Linden SK, Link JM, Liu Y, Liu Y, Louis WC, Mahn KBM, Marsh W, McGregor G, Metcalf W, Meyers PD, Mills F, Mills GB, Monroe J, Moore CD, Nelson RH, Nguyen VT, Nienaber P, Nowak JA, Ouedraogo S, Patterson RB, Perevalov D, Polly CC, Prebys E, Raaf JL, Ray H, Roe BP, Russell AD, Sandberg V, Schirato R, Schmitz D, Shaevitz MH, Shoemaker FC, Smith D, Sodeberg M, Sorel M, Spentzouris P, Stancu I, Stefanski RJ, Sung M, Tanaka HA, Tayloe R, Tzanov M, Van de Water R, Wascko MO, White DH, Wilking MJ, Yang HJ, Zeller GP, Zimmerman ED. Unexplained excess of electronlike events from a 1-GeV neutrino beam. Phys Rev Lett 2009; 102:101802. [PMID: 19392103 DOI: 10.1103/physrevlett.102.101802] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2008] [Indexed: 05/27/2023]
Abstract
The MiniBooNE Collaboration observes unexplained electronlike events in the reconstructed neutrino energy range from 200 to 475 MeV. With 6.46x10;{20} protons on target, 544 electronlike events are observed in this energy range, compared to an expectation of 415.2+/-43.4 events, corresponding to an excess of 128.8+/-20.4+/-38.3 events. The shape of the excess in several kinematic variables is consistent with being due to either nu_{e} and nu[over ]_{e} charged-current scattering or nu_{mu} neutral-current scattering with a photon in the final state. No significant excess of events is observed in the reconstructed neutrino energy range from 475 to 1250 MeV, where 408 events are observed compared to an expectation of 385.9+/-35.7 events.
Collapse
|
35
|
Nguyen NT, Pham VC, Litaudon M, Guéritte F, Grellier P, Nguyen VT, Nguyen VH. Antiplasmodial alkaloids from Desmos rostrata. J Nat Prod 2008; 71:2057-2059. [PMID: 19053513 DOI: 10.1021/np8004437] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Two new alkaloids, desmorostratine (1) and discretine N-oxide (2), were isolated from the stem bark of Desmos rostrata, together with five known alkaloids, discretine (3), dehydrodiscretine (4), pseudocolumbamine (5), predicentrine (6), and aristolactam AII (7). The structures were established on the basis of spectroscopic data, including mass spectrometry and 2D-NMR. Compound 1 was cytotoxic against KB cells (IC(50) 2.4 microM), while 2, 3, and 4 inhibited Plasmodium falciparum (IC(50) of 4.2, 1.6, and 0.9 microM, respectively).
Collapse
Affiliation(s)
- Ngoc Tuan Nguyen
- Institute of Chemistry, VAST, 18 Hoang Quoc Viet Road, Caugiay, Hanoi
| | | | | | | | | | | | | |
Collapse
|
36
|
Nguyen VT, Kure-bayashi S, Harayama H, Nagai T, Miyake M. Stage-specific effects of the osmolarity of a culture medium on the development of parthenogenetic diploids in the pig. Theriogenology 2003; 59:719-34. [PMID: 12517376 DOI: 10.1016/s0093-691x(02)01085-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [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: 11/26/2022]
Abstract
The objective of this study was to investigate the effects of osmolarity of culture media on the development of porcine parthenogenetic diploids. Oocyte-cumulus-granulosa cell complexes were collected from ovaries and then in vitro-cultured for 48 h. The mature oocytes were subjected to a single electro-stimulation (El-St; 100 micros, 1500 V/cm), treated with 5.0 microg/ml Cytochalasin B for 4h and then cultured under various conditions as described below. In Experiment 1, the diploids were cultured for 168 h after El-St in modified Whitten's medium with 256 mOsmol (mWM256), mKRB with 309 mOsmol, and mWM with 309 mOsmol (mWM309), in which the osmolarity was adjusted by addition of NaCl or mannitol, or by reduction of distilled water. In Experiment 2, the diploids were cultured in the five media used in Experiment 1 for the first 48 h, and then in mWM256 until 168 h after El-St. In Experiment 3, the diploids were cultured for the first 48 h in mWM with osmolarity adjusted from 256 to 330 mOsmol by addition of NaCl for the first 48 h and then in mWM256 until 168 h after El-St. In Experiment 4, the diploids were cultured in mWM with 290 mOsmol (mWM290) for the first period of 24, 48, or 72 h, and then in mWM256 until 168 h after El-St. In Experiment 5, after diploids were cultured in mWM290 for the first 48 h, the obtained 4-cell diploids were transferred to mWM with osmolarity adjusted from 200 to 310 mOsmol by addition of NaCl, then cultured until 168 h after El-St. All media were supplemented with 0.5mg/ml hyaluronic acid and 4.0mg/ml bovine serum albumin. The results obtained in Experiments 1-5 indicate that the osmolarity of a medium, but not the Na(+)/K(+) ratio, exerts effects on the development of diploids to the blastocyst stage. The change of osmolarity of the culture media after the 4-cell stage increased the rate of expanded blastocyst formation in porcine diploids. The optimal osmolarities of culture medium for the first 48 h after El-St (before the 4-cell stage) were 290 and 280-320 mOsmol, and those for the later period (after the 4-cell stage) were 256 and 220-270 mOsmol, respectively.
Collapse
Affiliation(s)
- V T Nguyen
- Department of Life Science, Graduate School of Science and Technology, Kobe University, 1-1 Rokkodai-cho Nada-ku, Hyogo, Kobe City 657-8501, Japan
| | | | | | | | | |
Collapse
|
37
|
Nguyen VT, Nguyen BD, Sarkarung S, Martinez C, Paterson AH, Nguyen HT. Mapping of genes controlling aluminum tolerance in rice: comparison of different genetic backgrounds. Mol Genet Genomics 2002; 267:772-80. [PMID: 12207224 DOI: 10.1007/s00438-002-0686-1] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2001] [Accepted: 04/25/2002] [Indexed: 11/30/2022]
Abstract
Aluminum toxicity is the main factor limiting the productivity of crop plants in acid soils, particularly in the tropics and subtropics. In this study, a doubled-haploid population derived from the rice ( Oryza sativa L.) breeding lines CT9993 and IR62266 was used to map genes controlling Al tolerance. A genetic linkage map consisting of 280 DNA markers (RFLP, AFLP and SSR) was constructed to determine the position and nature of quantitative trait loci (QTLs) affecting Al tolerance. Three characters - control root length (CRL), Al-stressed root length (SRL) and root length ratio (RR) - were evaluated for the DH lines and the parents at the seedling stage in nutrient solution. A total of 20 QTLs controlling root growth under Al stress and control conditions were detected and distributed over 10 of the 12 rice chromosomes, reflecting multigenic control of these traits. The two QTLs of largest effect, qALRR-1-1 and qALRR-8 for root length ratio (a measurement of Al tolerance) were localized on chromosomes 1 and 8, respectively. Three other QTLs in addition to qALRR-8 were apparently unique in the CT9993 x IR62266 mapping population, which may explain the high level of Al tolerance in CT9993. Comparative mapping identified a conserved genomic region on chromosome 1 associated with Al tolerance across three rice genetic backgrounds. This region provides an important starting point for isolating genes responsible for different mechanisms of aluminum tolerance and understanding the genetic nature of this trait in rice and other cereals.
Collapse
Affiliation(s)
- V T Nguyen
- College of Natural Sciences, Vietnam National University, Hanoi, Vietnam
| | | | | | | | | | | |
Collapse
|
38
|
Butnev VY, Singh V, Nguyen VT, Bousfield GR. Truncated equine LH beta and asparagine(56)-deglycosylated equine LH alpha combine to produce a potent FSH antagonist. J Endocrinol 2002; 172:545-55. [PMID: 11874703 DOI: 10.1677/joe.0.1720545] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Hybrid hormone preparations were prepared by combining intact and Asn(56)-deglycosylated (N(56)dg) equine (e) LH or FSH alpha subunit preparations with truncated, des(121-149)eLH beta (eLH beta t), immunopurified, intact eLH beta or equine chorionic gonadotropin beta (eCG beta) preparations, and eFSH beta. The LH receptor-binding potencies of N(56)dg-eLH alpha:eLH beta t and N(56)dg-eFSH alpha:eLH beta t hybrids were equivalent to that of eLH; however, both N(56)dg-alpha preparations were only 3-4% as active as eLH in the rat testis Leydig cell bioassay. In the granulosa cell FSH bioassay, eLH alpha:eLH beta t stimulated progesterone synthesis and induced aromatase activity, while N(56)dg-eLH alpha:eLH beta t was completely inactive at doses up to 5 microg. N(56)dg-eLH alpha:eLH beta t inhibited progesterone production and aromatase induction elicited by 0.3 ng eFSH or 2 ng human (h) FSH. The inhibitory activities of N(56)dg-eLH alpha:eLH beta and N(56)dg-eCG alpha:eLH beta t were only 10% that of N(56)dg-eLH alpha:eLH beta t. N(56)dg-eLH alpha:eCG beta did not inhibit progesterone synthesis stimulated by eFSH at all and appeared to further stimulate aromatase induction at the highest dose tested. Preincubation of N(56)dg-eLH alpha:eLH beta and N(56)dg-eLH alpha:eLH beta t for 72 h at 37 C resulted in no loss of FSH receptor-binding activity. Preincubation resulted in 50% loss of receptor-binding activity by the eFSH preparation due to subunit dissociation, while 88% of N(56)dg-eLH alpha:eFSH beta activity was lost following 72 h, 37 C preincubation. While alpha Asn(56) oligosaccharide had no effect on eLH beta hybrid stability, it did contribute to the stability of the eFSH heterodimer.
Collapse
Affiliation(s)
- V Y Butnev
- Department of Biological Sciences, Wichita State University, Wichita, Kansas 67260--0026, USA
| | | | | | | |
Collapse
|
39
|
Arredondo J, Nguyen VT, Chernyavsky AI, Jolkovsky DL, Pinkerton KE, Grando SA. A receptor-mediated mechanism of nicotine toxicity in oral keratinocytes. J Transl Med 2001; 81:1653-68. [PMID: 11742036 DOI: 10.1038/labinvest.3780379] [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: 11/09/2022] Open
Abstract
Smoking and smokeless tobacco cause morbidity that originates from the epithelium lining of the skin and upper digestive tract. Oral keratinocytes (OKC) express nicotinic acetylcholine receptors (nAChRs) that bind nicotine (Nic). We studied the mechanism of the receptor-mediated toxicity of tobacco products on OKC. Preincubation of normal human OKC with Nic altered the ligand-binding kinetics of their nAChRs, suggesting that the nAChRs underwent structural changes. This hypothesis was confirmed by the finding that exposure of OKC to Nic causes transcriptional and translational changes. Through RT-PCR and immunoblotting, we found a 1.5- to 2.9-fold increase in the mRNA and protein levels of alpha3, alpha5, alpha7, beta2, and beta4 nAChR subunits. Exposure of OKC to Nic also changed the mRNA and protein levels of the cell cycle and cell differentiation markers Ki-67, PCNA, p21, cyclin D1, p53, filaggrin, loricrin, and cytokeratins 1 and 10. The nicotinic antagonist mecamylamine prevented these changes, which indicates that the Nic-induced changes in the expression of both the nAChR and the cell cycle and cell differentiation genes resulted from pharmacologic stimulation of nAChRs with Nic. To establish the relevance of these findings to the pathobiologic effects of tobacco products in vivo, we studied the above parameters in the oral tissue of rats and mice after their exposure for 3 weeks to environmental cigarette smoke or drinking water containing equivalent concentrations of Nic that are pathophysiologically relevant. The changes of the nAChRs and the cell cycle and cell differentiation genes were similar to those found in vitro. The results of indirect immunofluorescence assay of tissue specimens validated these findings. Thus, some pathobiologic effects of tobacco products in oral tissues may stem from Nic-induced alterations of the structure and function of keratinocyte nAChRs responsible for the physiologic regulation of the cell cycle by the cytotransmitter acetylcholine.
Collapse
Affiliation(s)
- J Arredondo
- Department of Dermatology, School of Medicine, University of California, Davis 95817, USA
| | | | | | | | | | | |
Collapse
|
40
|
Abstract
The transcription of eukaryotic protein-coding genes involves complex regulation of RNA polymerase (Pol) II activity in response to physiological conditions and developmental cues. One element of this regulation involves phosphorylation of the carboxy-terminal domain (CTD) of the largest polymerase subunit by a transcription elongation factor, P-TEFb, which comprises the kinase CDK9 and cyclin T1 or T2 (ref. 1). Here we report that in human HeLa cells more than half of the P-TEFb is sequestered in larger complexes that also contain 7SK RNA, an abundant, small nuclear RNA (snRNA) of hitherto unknown function. P-TEFb and 7SK associate in a specific and reversible manner. In contrast to the smaller P-TEFb complexes, which have a high kinase activity, the larger 7SK/P-TEFb complexes show very weak kinase activity. Inhibition of cellular transcription by chemical agents or ultraviolet irradiation trigger the complete disruption of the P-TEFb/7SK complex, and enhance CDK9 activity. The transcription-dependent interaction of P-TEFb with 7SK may therefore contribute to an important feedback loop modulating the activity of RNA Pol II.
Collapse
Affiliation(s)
- V T Nguyen
- Génétique Moléculaire, UMR 8541 CNRS, Ecole Normale Supérieure, 46 rue d'Ulm, 75230 Paris cedex 05, France
| | | | | | | |
Collapse
|
41
|
Gerschenson M, Nguyen VT, St Claire MC, Harbaugh SW, Harbaugh JW, Proia LA, Poirier MC. Chronic stavudine exposure induces hepatic mitochondrial toxicity in adult Erythrocebus patas monkeys. J Hum Virol 2001; 4:335-42. [PMID: 12082400] [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: 02/25/2023]
Abstract
OBJECTIVES To understand the mitochondrial mechanisms underlying the lactic acidosis and hepatic steatosis seen in some HIV-1-infected individuals after long-term stavudine (d4T) exposure, we have explored mitochondrial integrity in adult monkeys (Erythrocebus patas) given a daily human equivalent dose of d4T for 78 days. STUDY DESIGN/METHODS Three Erythrocebus patas (patas) monkeys were given 3 mg d4T orally twice daily (total 6 mg d4T), or approximately 1.2 mg d4T/kg body weight per day, for 78 days and compared with 3 unexposed animals. Blood taken from controls and from treated monkeys before and after drug exposure was subjected to a complete clinical chemistry profile. Liver and skeletal muscles were examined for oxidative phosphorylation enzyme specific activities, mitochondrial deoxyribonucleic acid (mtDNA) quantity by slot blot, and mtDNA integrity by Southern blot. RESULTS Clinical chemistry assays demonstrated few significant differences; however, one d4T-exposed monkey had a serum lactate of 8.1 mmol/L after 78 days of oral d4T ingestion. Specific activities of oxidative phosphorylation Complexes I, II, and IV were significantly altered in both livers and skeletal muscles from the d4T-exposed animals, compared with the controls (p < or = 0.05). Significant depletion of mitochondrial DNA was observed in livers of drug-exposed monkeys, but not in skeletal muscle (p < or = 0.05). Further examination of liver DNA by Southern blot confirmed hepatic mtDNA depletion in drug exposed animals. CONCLUSIONS The data suggest that direct examination of the liver may be required to elucidate clinical d4T-induced hepatotoxicity related to mitochondrial damage.
Collapse
Affiliation(s)
- M Gerschenson
- Division of Heart and Vascular Diseases, National Heart, Lung, and Blood Institute, Bethesda, Maryland, USA
| | | | | | | | | | | | | |
Collapse
|
42
|
Abstract
Alzheimer's disease (AD) is a progressive dementing neurologic illness, and the most frequent cause of dementia in the elderly. Neuritic plaques are one of the main neuropathological findings in AD, and the major protein component is the beta-amyloid protein (A beta). Another striking feature of neuritic plaques is the presence of activated microglia, cytokines, and complement components, suggestive of "inflammatory foci" within AD brain. In this review, we will examine the mechanisms by which microglia become activated in AD, emphasizing the role in the A beta protein and proinflammatory cytokines. As well, pathways for suppression of microglial activation by immunosuppressive cytokines will be described. Inflammation mediated by activated microglia is an important component of AD pathophysiology, and strategies to control this response could provide new therapeutic approaches for the treatment of AD.
Collapse
Affiliation(s)
- E N Benveniste
- Department of Cell Biology, The University of Alabama at Birmingham, 1918 University Boulevard, MCLM 395, Birmingham, AL 35294-0005, USA.
| | | | | |
Collapse
|
43
|
Abstract
BACKGROUND Nutritional zinc deficiency in rats increases esophageal cell proliferation and the incidence of N-nitrosomethylbenzylamine (NMBA)-induced esophageal tumors. Replenishing zinc with a zinc-sufficient diet reduces these effects in zinc-deficient (ZD) rats. We investigated whether apoptosis was involved in the reduction of NMBA-induced esophageal tumors when ZD rats consumed a zinc-sufficient diet. METHODS Weanling rats were fed a ZD diet (zinc at 3-4 ppm) for 5 weeks to establish esophageal cell proliferation, then treated once with NMBA (2 mg/kg body weight), and divided into the following five groups (47-100 per group). One ZD group was fed the ZD diet, and four zinc-replenished (ZR) groups, ZR(1), ZR(24), ZR(72), and ZR(432), were fed a zinc-sufficient diet (zinc at 74-75 ppm) beginning 1, 24, 72, and 432 hours, respectively, after NMBA treatment. From 24 hours to 2 weeks after beginning a zinc-sufficient diet, esophagi from all ZR groups were analyzed for apoptosis and cell proliferation; ZD esophagi were the controls. Tumor incidence was determined 15 weeks after zinc replenishment. All statistical tests were two-sided. RESULTS Zinc replenishment initiated shortly after NMBA treatment effectively reduced esophageal tumorigenesis; 8% (three of 37) of ZR(1), 14% (five of 37) of ZR(24), 19% (five of 26) of ZR(72), and 48% (19 of 40) of ZR(432) rats developed esophageal tumors compared with 93% (14 of 15) of ZD animals (all P<.001). Importantly, 24 and 30 hours after zinc replenishment, esophagi had numerous apoptotic cells (% apoptotic cells: 0 hour = 2.9%, 95% confidence interval [CI] = 2.5% to 3.3%; 24 hours = 9.4%, 95% CI = 8.2% to 10.6%), and the expression of the proapoptotic Bax protein doubled. Within 48 hours, the ZR(1) epithelium was three to five cell layers thick compared with 10-20 layers before zinc replenishment. CONCLUSIONS Zinc replenishment of NMBA-treated ZD rats rapidly induces apoptosis in esophageal epithelial cells and thereby substantially reduces the development of esophageal cancer.
Collapse
Affiliation(s)
- L Y Fong
- Department of Microbiology and Immunology, Kimmel Cancer Institute, Thomas Jefferson University, Philadelphia, PA 19107-6799, USA.
| | | | | |
Collapse
|
44
|
|
45
|
Walton WJ, Nguyen VT, Butnev VY, Singh V, Moore WT, Bousfield GR. Characterization of human FSH isoforms reveals a nonglycosylated beta-subunit in addition to the conventional glycosylated beta-subunit. J Clin Endocrinol Metab 2001; 86:3675-85. [PMID: 11502795 DOI: 10.1210/jcem.86.8.7712] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Human FSH consists of a mixture of isoforms that can be separated on the basis of differences in negative charge conferred by variations in the numbers of sialic acid residues that terminate oligosaccharide branches. Western analysis of human FSH isoforms separated by chromatofocusing revealed the presence of two human FSHbeta isoforms that differed in size. A low mol wt human FSHbeta isoform was associated with all FSH isoform fractions. A high mol wt human FSHbeta isoform was associated with the more acidic fractions and increased in relative abundance as the pI decreased. Characterization of representative human FSHbeta isoforms by mass spectrometry and automated Edman degradation revealed a low mol wt isoform that was not glycosylated. A high mol wt isoform was N-glycosylated at Asn residues 7 and 24. These results indicate that pituitary human FSH consists of two classes of molecules: those that possess a nonglycosylated beta-subunit and those that possess a glycosylated beta-subunit. Glycoprotein hormones are known to be elliptical molecules, and the beta-subunit oligosaccharides project outward from the short diameter, thereby increasing it. It is interesting to speculate that this change in shape might affect ultrafiltration rates, leading to differences in delivery rates to target tissues and elimination by filtration in the kidney.
Collapse
Affiliation(s)
- W J Walton
- Department of Biological Sciences, Wichita State University, Wichita, Kansas 67260-0026, USA
| | | | | | | | | | | |
Collapse
|
46
|
Nguyen VM, Nguyen VT, Huynh PL, Dang DT, Nguyen TH, Phan VT, Nguyen TL, Le TL, Ivanoff B, Gentsch JR, Glass RI. The epidemiology and disease burden of rotavirus in Vietnam: sentinel surveillance at 6 hospitals. J Infect Dis 2001; 183:1707-12. [PMID: 11372022 DOI: 10.1086/320733] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2001] [Revised: 03/21/2001] [Indexed: 11/04/2022] Open
Abstract
The disease burden of rotavirus diarrhea in Vietnam was assessed by surveillance of children <5 years old who were hospitalized for diarrhea at 3 centers in the north and 3 centers in the south. Rotavirus was identified in 56% (range, 47%-60%) of the 5768 patients surveyed between July 1998 and June 2000. G-typing of the first 224 strains indicated that only 2% were non-typeable, 9% were in mixed infections, and the remainder were of the common serotypes G1, G2, G3, G4, and G9. In Vietnam, diarrhea accounts for 9880 deaths per year, which is approximately 15% of all deaths among children <5 years old, or 6.5 deaths per 1000 children. If even 50% of these diarrhea-related deaths in Vietnam were due to rotavirus, the number would represent 4%-8% of all deaths among children <5 years old, 2700-5400 rotavirus-related deaths per year, and 1 death per 280-560 children during the first 5 years of life. Thus, the disease burden of rotavirus in Vietnam is substantial, and programs to encourage the use of oral rehydration should be encouraged while efforts to develop vaccines continue.
Collapse
Affiliation(s)
- V M Nguyen
- Poliomyelitis Vaccine Research and Production Center, Hanoi, Vietnam.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Nguyen VT, Ndoye A, Hall LL, Zia S, Arredondo J, Chernyavsky AI, Kist DA, Zelickson BD, Lawry MA, Grando SA. Programmed cell death of keratinocytes culminates in apoptotic secretion of a humectant upon secretagogue action of acetylcholine. J Cell Sci 2001; 114:1189-204. [PMID: 11228162 DOI: 10.1242/jcs.114.6.1189] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [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: 01/01/2023] Open
Abstract
The programmed cell death of the stratified squamous epithelial cells comprising human epidermis culminates in abrupt transition of viable granular keratinocytes (KC) into dead corneocytes sloughed by the skin. The granular cell-corneocyte transition is associated with a loss in volume and dry cell weight but the mechanism for and biological significance of this form of keratinocyte apoptosis remain obscure. We show that terminally differentiated KC extrude into the intercellular spaces of living epidermis the cytoplasmic buds containing randomly congregated components of the cytosol as well as filaggrin, a precursor of the natural moisturizing factor. The discharge of secretory product is reminiscent of holocrine secretion, suggesting the term ‘apoptotic secretion’ for this novel, essential step in the process of cornification. The secretory product may become a part of the glycocalyx (a.k.a. ‘intercellular cement substance’ of epidermis) and serve as a humectant that counterbalances the osmotic pressure imposed by the natural moisturizing factor located in the stratum corneum comprised by corneocytes. The apoptotic secretion commences upon secretagouge action of acetylcholine which is synthesized and released by KC. A combination of a cholinergic nicotinic agonist and a muscarinic antagonist which increases intracellular calcium levels is required to trigger the apoptotic secretion. Analysis of the relative amounts of cholinergic enzymes and receptors expressed by KC capable of secretion and the pharmacological profiles of secretion regulation revealed an upward concentration gradient of free acetylcholine in epidermis which may provide for its unopposed secretagogue action via the m1 muscarinic and the (α)7, and (α)9 nicotinic receptor types expressed by KC at the latest stage of their development in the epidermis.
Collapse
Affiliation(s)
- V T Nguyen
- Department of Dermatology, University of California Davis, CA 95817, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Fong LY, Nguyen VT, Pegg AE, Magee PN. Alpha-difluoromethylornithine induction of apoptosis: a mechanism which reverses pre-established cell proliferation and cancer initiation in esophageal carcinogenesis in zinc-deficient rats. Cancer Epidemiol Biomarkers Prev 2001; 10:191-9. [PMID: 11303587] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
Alpha-difluoromethylornithine (DFMO) is an irreversible inhibitor of ornithine decarboxylase, the first enzyme in polyamine synthesis. Previous work showed simultaneous administration of DFMO and a zinc-deficient (ZD) diet to weanling rats from the beginning inhibited the onset of zinc-deficiency-induced esophageal cell proliferation by activating apoptosis and reduced the incidence of N-nitrosomethylbenzylamine (NMBA)-induced esophageal cancer. Because esophageal cancer initiation by NMBA is very rapid in ZD rats, this study determined whether DFMO is effective in preventing esophageal carcinogenesis when administered after the establishment of a carcinogenic environment. Weanling rats were given a ZD diet for 5 weeks to establish sustained increased esophageal cell proliferation and then an intragastric dose of NMBA. Thereafter, 20 rats were switched to DFMO-containing water while nine control ZD animals remained on deionized water; all of the animals continued on the ZD diet. Esophagi were collected 15 weeks later. The upper portion was processed for immunohistochemical analysis of cell proliferation, apoptosis, and expression of related genes, and the lower was processed for polyamine content. DFMO substantially reduces the levels of esophageal putrescine and spermidine and esophageal tumor incidence from 89 to 10% in ZD rats. Importantly, DFMO-treated ZD esophagi display increased rate of apoptosis accompanied by intense bax expression and greatly reduced cell proliferation by proliferating cell nuclear antigen expression. In addition, the p16(ink4a)/retinoblastoma control at G1 to S, deregulated in ZD esophagi, is restored after DFMO treatment. These results demonstrate that DFMO, a highly effective chemopreventive agent in esophageal carcinogenesis, reverses and counteracts esophageal cell proliferation/cancer initiation in ZD animals by way of stimulating apoptosis.
Collapse
Affiliation(s)
- L Y Fong
- Department of Microbiology and Immunology, Kimmel Cancer Institute, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA.
| | | | | | | |
Collapse
|
49
|
O'Keefe GM, Nguyen VT, Ping Tang LL, Benveniste EN. IFN-gamma regulation of class II transactivator promoter IV in macrophages and microglia: involvement of the suppressors of cytokine signaling-1 protein. J Immunol 2001; 166:2260-9. [PMID: 11160280 DOI: 10.4049/jimmunol.166.4.2260] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The discovery of the class II transactivator (CIITA) transcription factor, and its IFN-gamma-activated promoter (promoter IV), have provided new opportunities to understand the molecular mechanisms of IFN-gamma-induced class II MHC expression. Here, we investigated the molecular regulation of IFN-gamma-induced murine CIITA promoter IV activity in microglia/macrophages. In the macrophage cell line RAW264.7, IFN-gamma inducibility of CIITA promoter IV is dependent on an IFN-gamma activation sequence (GAS) element and adjacent E-Box, and an IFN response factor (IRF) element, all within 196 bp of the transcription start site. In both RAW cells and the microglia cell line EOC20, two IFN-gamma-activated transcription factors, STAT-1alpha and IRF-1, bind the GAS and IRF elements, respectively. The E-Box binds upstream stimulating factor-1 (USF-1), a constitutively expressed transcription factor. Functionally, the GAS, E-Box, and IRF elements are each essential for IFN-gamma-induced CIITA promoter IV activity. The effects of the suppressors of cytokine signaling-1 (SOCS-1) protein on IFN-gamma-induced CIITA and class II MHC expression were examined. Ectopic expression of SOCS-1 inhibits IFN-gamma-induced activation of CIITA promoter IV and subsequent class II MHC protein expression. Interestingly, SOCS-1 inhibits the constitutive expression of STAT-1alpha and its IFN-gamma-induced tyrosine phosphorylation and binding to the GAS element in CIITA promoter IV. As well, IFN-gamma-induced expression of IRF-1 and its binding to the IRF element is inhibited. These results indicate that SOCS-1 may be responsible for attenuating IFN-gamma-induced CIITA and class II MHC expression in macrophages.
Collapse
Affiliation(s)
- G M O'Keefe
- Department of Cell Biology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | | | | | | |
Collapse
|
50
|
Ioannides P, Nguyen VT, Enderby JE. Measurement of the absolute thermoelectric power of liquid conductors enclosed in metallic tubes. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3735/8/4/023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|