1
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Nguyen VTC, Nguyen TH, Doan NNT, Pham TMQ, Nguyen GTH, Nguyen TD, Tran TTT, Vo DL, Phan TH, Jasmine TX, Nguyen VC, Nguyen HT, Nguyen TV, Nguyen THH, Huynh LAK, Tran TH, Dang QT, Doan TN, Tran AM, Nguyen VH, Nguyen VTA, Ho LMQ, Tran QD, Pham TTT, Ho TD, Nguyen BT, Nguyen TNV, Nguyen TD, Phu DTB, Phan BHH, Vo TL, Nai THT, Tran TT, Truong MH, Tran NC, Le TK, Tran THT, Duong ML, Bach HPT, Kim VV, Pham TA, Tran DH, Le TNA, Pham TVN, Le MT, Vo DH, Tran TMT, Nguyen MN, Van TTV, Nguyen AN, Tran TT, Tran VU, Le MP, Do TT, Phan TV, Nguyen HDL, Nguyen DS, Cao VT, Do TTT, Truong DK, Tang HS, Giang H, Nguyen HN, Phan MD, Tran LS. Multimodal analysis of methylomics and fragmentomics in plasma cell-free DNA for multi-cancer early detection and localization. eLife 2023; 12:RP89083. [PMID: 37819044 PMCID: PMC10567114 DOI: 10.7554/elife.89083] [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] [Indexed: 10/13/2023] Open
Abstract
Despite their promise, circulating tumor DNA (ctDNA)-based assays for multi-cancer early detection face challenges in test performance, due mostly to the limited abundance of ctDNA and its inherent variability. To address these challenges, published assays to date demanded a very high-depth sequencing, resulting in an elevated price of test. Herein, we developed a multimodal assay called SPOT-MAS (screening for the presence of tumor by methylation and size) to simultaneously profile methylomics, fragmentomics, copy number, and end motifs in a single workflow using targeted and shallow genome-wide sequencing (~0.55×) of cell-free DNA. We applied SPOT-MAS to 738 non-metastatic patients with breast, colorectal, gastric, lung, and liver cancer, and 1550 healthy controls. We then employed machine learning to extract multiple cancer and tissue-specific signatures for detecting and locating cancer. SPOT-MAS successfully detected the five cancer types with a sensitivity of 72.4% at 97.0% specificity. The sensitivities for detecting early-stage cancers were 73.9% and 62.3% for stages I and II, respectively, increasing to 88.3% for non-metastatic stage IIIA. For tumor-of-origin, our assay achieved an accuracy of 0.7. Our study demonstrates comparable performance to other ctDNA-based assays while requiring significantly lower sequencing depth, making it economically feasible for population-wide screening.
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2
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Nguyen THH, Lu YT, Le VH, Bui VQ, Nguyen LH, Pham NH, Phan TH, Nguyen HT, Tran VS, Bui CV, Vo VK, Nguyen PTN, Dang HHP, Pham VD, Cao VT, Nguyen TD, Nguyen LHD, Phan NM, Nguyen TH, Nguyen VTC, Pham TMQ, Tran VU, Le MP, Vo DH, Tran TMT, Nguyen MN, Nguyen TT, Tieu BL, Nguyen HTP, Truong DYA, Cao CTT, Nguyen VT, Le TLQ, Luong TLA, Doan TKP, Dao TT, Phan CD, Nguyen TX, Pham NT, Nguyen BT, Pham TTT, Le HL, Truong CT, Jasmine TX, Le MC, Phan VB, Truong QB, Tran THL, Huynh MT, Tran TQ, Nguyen ST, Tran V, Tran VK, Nguyen HN, Nguyen DS, Nguyen TQT, Phan TV, Do TTT, Truong DK, Tang HS, Phan MD, Giang H, Nguyen HN, Tran LS. Clinical validation of a ctDNA-Based Assay for Multi-Cancer Detection: An Interim Report from a Vietnamese Longitudinal Prospective Cohort Study of 2795 Participants. Cancer Invest 2023; 41:1-17. [PMID: 36719061 DOI: 10.1080/07357907.2023.2173773] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 01/18/2023] [Accepted: 01/24/2023] [Indexed: 02/01/2023]
Abstract
The SPOT-MAS assay "Screening for the Presence Of Tumor by Methylation And Size" detects the five most common cancers in Vietnam by evaluating circulating tumor DNA in the blood. Here, we validated its performance in a prospective multi-center clinical trial, K-DETEK. Our analysis of 2795 participants from 14 sites across Vietnam demonstrates its ability to detect cancers in asymptomatic individuals with a positive predictive value of 60%, with 83.3% accuracy in detecting tumor location. We present a case report to support further using SPOT-MAS as a complementary method to achieve early cancer detection and provide the opportunity for early treatment.
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Affiliation(s)
- Thi Hue Hanh Nguyen
- Research and Development Department, Gene Solutions, Ho Chi Minh, Vietnam
- Medical Genetics Institute, Ho Chi Minh, Vietnam
| | - Y-Thanh Lu
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Medical Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Van Hoi Le
- Department of General Planning and General Affaire, National Cancer Hospital, Hanoi, Vietnam
| | - Vinh Quang Bui
- Department of Radiation Therapy, Hanoi Oncology Hospital, Hanoi, Vietnam
| | - Lan Hieu Nguyen
- Department of Cardiology, Hanoi Medical University, Hanoi, Vietnam
| | - Nhu Hiep Pham
- Gastroenterology Department, Hue Central Hospital, Hue, Vietnam
| | - Thanh Hai Phan
- Director Board, Medic Medical Center, Ho Chi Minh, Vietnam
| | - Huu Thinh Nguyen
- Out-patient health care services department, University Medical Center HCM, Ho Chi Minh, Vietnam
| | - Van Song Tran
- Director Board, People's Hospital 115, Ho Chi Minh, Vietnam
| | - Chi Viet Bui
- Board of Management, Xuyen A General Hospital, Ho Chi Minh, Vietnam
| | - Van Kha Vo
- Director of Cantho Oncology Hospital, Vietnam, Cantho Oncology Hospital, Can Tho, Vietnam
| | | | - Ha Huu Phuoc Dang
- Interventional Cardiology Department, Dongnai General Hospital, Dong Nai, Vietnam
| | - Van Dung Pham
- Director Board, Thong Nhat Dongnai General Hospital, Dong Nai, Vietnam
| | - Van Thinh Cao
- Department of Cardiology, Le Van Thinh Hospital, Ho Chi Minh, Vietnam
| | - Thanh Dat Nguyen
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Data Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Luu Hong Dang Nguyen
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Medical Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Ngoc Minh Phan
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Medical Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Trong Hieu Nguyen
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Data Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Van Thien Chi Nguyen
- Research and Development Department, Gene Solutions, Ho Chi Minh, Vietnam
- Medical Genetics Institute, Ho Chi Minh, Vietnam
| | - Thi Mong Quynh Pham
- Research and Development Department, Gene Solutions, Ho Chi Minh, Vietnam
- Medical Genetics Institute, Ho Chi Minh, Vietnam
| | - Vu Uyen Tran
- Research and Development Department, Gene Solutions, Ho Chi Minh, Vietnam
- Medical Genetics Institute, Ho Chi Minh, Vietnam
| | - Minh Phong Le
- Research and Development Department, Gene Solutions, Ho Chi Minh, Vietnam
- Medical Genetics Institute, Ho Chi Minh, Vietnam
| | - Dac Ho Vo
- Research and Development Department, Gene Solutions, Ho Chi Minh, Vietnam
- Medical Genetics Institute, Ho Chi Minh, Vietnam
| | - Thi Minh Thu Tran
- Research and Development Department, Gene Solutions, Ho Chi Minh, Vietnam
- Medical Genetics Institute, Ho Chi Minh, Vietnam
| | - Minh Nguyen Nguyen
- Research and Development Department, Gene Solutions, Ho Chi Minh, Vietnam
- Medical Genetics Institute, Ho Chi Minh, Vietnam
| | - Thi Thanh Nguyen
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Medical Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Ba Linh Tieu
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Medical Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Huu Tam Phuc Nguyen
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Clinical Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Dinh Yen An Truong
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Clinical Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Chi Thuy Tien Cao
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Clinical Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Van Tung Nguyen
- Breast Cancer Department, National Cancer Hospital, Hanoi, Vietnam
| | - Thi Le Quyen Le
- Lung Cancer Department, Hanoi Oncology Hospital, Hanoi, Vietnam
| | - Thi Lan Anh Luong
- Center of clinical genetics and genomics Vietnam, Hanoi Medical University, Hanoi, Vietnam
| | - Thi Kim Phuong Doan
- Center of clinical genetics and genomics Vietnam, Hanoi Medical University, Hanoi, Vietnam
| | - Thi Trang Dao
- Center of clinical genetics and genomics Vietnam, Hanoi Medical University, Hanoi, Vietnam
| | - Canh Duy Phan
- Oncology Department, Hue Central hospital, Hue, Vietnam
| | | | | | - Bao Toan Nguyen
- Laboratory Department, Medic Medical Center, Ho Chi Minh, Vietnam
| | | | - Huu Linh Le
- Respiratory Clinic, Medic Medical Center, Ho Chi Minh, Vietnam
| | | | | | - Minh Chi Le
- Health care services Department, University Medical Center HCM, Ho Chi Minh, Vietnam
| | - Van Bau Phan
- Board of Management, People's Hospital 115, Ho Chi Minh, Vietnam
| | - Quang Binh Truong
- Cardiology Center, University Medical Center HCM, Ho Chi Minh, Vietnam
| | - Thi Huong Ly Tran
- General Planning Department, Cantho Oncology Hospital, Can Tho, Vietnam
| | - Minh Thien Huynh
- General Planning Department, Cantho Oncology Hospital, Can Tho, Vietnam
| | - Tu Quy Tran
- General Surgery Department, Danang Oncology Hospital, Da Nang, Vietnam
| | - Si Tuan Nguyen
- Microbiology Department, Thong Nhat Dongnai General Hospital, Dong Nai, Vietnam
| | - Vu Tran
- Oncology Department, Thong Nhat Dongnai General Hospital, Dong Nai, Vietnam
| | - Van Khanh Tran
- Director Board, Le Van Thinh Hospital, Ho Chi Minh, Vietnam
| | - Huu Nguyen Nguyen
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Director Board, Gene Solutions, Ho Chi Minh, Vietnam
| | - Duy Sinh Nguyen
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Medical Department, Gene Solutions, Ho Chi Minh, Vietnam
| | | | - Thi Van Phan
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Clinical Department, Gene Solutions, Ho Chi Minh, Vietnam
| | | | - Dinh-Kiet Truong
- Director Board, Medical Genetics Institute, Ho Chi Minh, Vietnam
| | - Hung Sang Tang
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Medical Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Minh Duy Phan
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Data Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Hoa Giang
- Medical Genetics Institute, Ho Chi Minh, Vietnam
- Data Department, Gene Solutions, Ho Chi Minh, Vietnam
| | - Hoai Nghia Nguyen
- Research and Development Department, Gene Solutions, Ho Chi Minh, Vietnam
- Medical Genetics Institute, Ho Chi Minh, Vietnam
| | - Le Son Tran
- Research and Development Department, Gene Solutions, Ho Chi Minh, Vietnam
- Medical Genetics Institute, Ho Chi Minh, Vietnam
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3
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Yoo O, Tang EKY, Salman S, Nguyen MN, Sommerfield D, Sommerfield A, Khan N, von Ungern Sternberg BS, Lim LY. A randomised controlled trial of a novel tramadol chewable tablet: pharmacokinetics and tolerability in children. Anaesthesia 2022; 77:438-448. [PMID: 35083739 DOI: 10.1111/anae.15650] [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] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/02/2021] [Indexed: 11/29/2022]
Abstract
Tramadol is a bitter atypical opioid analgesic drug and is prescribed to treat postoperative pain in children. However, in many countries there is no licensed paediatric tramadol formulation available. We have formulated a novel chewable chocolate-based drug delivery system for the administration of tramadol to children. This pilot, single-centre, open-label, randomised clinical study assessed the taste tolerability and comparative population pharmacokinetics of the novel tramadol chewable tablet against a compounded tramadol hydrochloride oral liquid, at a dose of 1 mg.kg-1 . A 5-point facial hedonic scale was used by the children, parents and nurses to assess tolerability. One hundred and forty-one children aged 3-16 years were given tramadol 30 min before general anaesthesia. Blood samples were taken following the induction of anaesthesia and for up to 5 h following tramadol administration. Tramadol and its active metabolite O-desmethyltramadol were analysed using reversed-phase high-performance liquid chromatography. A population pharmacokinetic model was built using non-linear mixed effects modelling. The relative bioavailability for the tablet was 1.25 times higher (95%CI 1.16-1.35) than for tramadol hydrochloride oral liquid, while the absorption rate constant for the tablet was significantly lower (1.97 h-1 vs. 3.34 h-1 , p < 0.001). Larger inter-individual variability in absorption rates were observed with the liquid tramadol. The tramadol chewable tablet was more acceptable in taste to children when assessed by the children, parents and nurses (all p < 0.001). We conclude that the novel tramadol chewable tablet has favourable acceptability and more reliable relative bioavailability in children compared with tramadol hydrochloride oral liquid.
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Affiliation(s)
- O Yoo
- Department of Mathematics and Statistics, University of Western Australia, Perth, WA, Australia
| | - E K Y Tang
- Department of Mathematics and Statistics, University of Western Australia, Perth, WA, Australia
| | - S Salman
- Clinical Pharmacology and Toxicology Unit, PathWest, Perth, WA, Australia.,Department of Mathematics and Statistics, University of Western Australia, Perth, WA, Australia
| | - M N Nguyen
- Department of Mathematics and Statistics, University of Western Australia, Perth, WA, Australia
| | - D Sommerfield
- Department of Mathematics and Statistics, University of Western Australia, Perth, WA, Australia.,Department of Anaesthesia and Pain Management, Perth's Children Hospital, Perth, WA, Australia
| | - A Sommerfield
- Department of Anaesthesia and Pain Management, Perth's Children Hospital, Perth, WA, Australia.,Peri-operative Medicine Team, Telethon Kids Institute, Perth, WA, Australia
| | - N Khan
- Department of Mathematics and Statistics, University of Western Australia, Perth, WA, Australia
| | - B S von Ungern Sternberg
- Department of Anaesthesia and Pain Management, Perth's Children Hospital, Perth, WA, Australia.,Division of Emergency Medicine, Anaesthesia and Pain Medicine, Medical School, University of Western Australia, Perth, WA, Australia
| | - L Y Lim
- Division of Pharmacy, School of Allied Health, University of Western Australia, Perth, WA, Australia
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4
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Yoo O, Tang EKY, Nguyen MN, Salman S, Hua AJ, von Ungern Sternberg BS, Lim LY. HPLC-UV assay of tramadol and O-desmethyltramadol in human plasma containing other drugs potentially co-administered to participants in a paediatric population pharmacokinetic study. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1184:122971. [PMID: 34649173 DOI: 10.1016/j.jchromb.2021.122971] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 09/28/2021] [Accepted: 09/30/2021] [Indexed: 12/12/2022]
Abstract
Multimodal analgesia is employed in paediatric pain management to maximise analgesia and minimise side effects. Tramadol is dosed at 1-1.5 mg/kg to treat severe pain in children but the assay for tramadol in plasma samples for pharmacokinetic and toxicology studies does not often consider concurrently administered medications. In this study we developed and validated an HPLC-UV method to quantify tramadol and its main metabolite (O-desmethyltramadol) in human plasma in the presence of seven potentially interfering drugs. Sample preparation method was developed by combining liquid-liquid extraction and protein precipitation. Chromatographic separation was achieved on a BDS-Hypersil-C18 column (5 µm, 250 × 4.6 mm) using a double gradient method. The limit of quantification was 6.7 ng/ml for both tramadol and ODT. The precision and accuracy were in compliance with ICH guidelines. This method was successfully employed to analyse the blood samples of 137 paediatric participants in a tramadol pharmacokinetic trial.
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Affiliation(s)
- O Yoo
- Division of Pharmacy, School of Allied Health, University of Western Australia, Perth, Australia
| | - E K Y Tang
- Division of Pharmacy, School of Allied Health, University of Western Australia, Perth, Australia
| | - M N Nguyen
- Division of Pharmacy, School of Allied Health, University of Western Australia, Perth, Australia
| | - S Salman
- Clinical Pharmacology and Toxicology Unit, PathWest, Perth, Australia; Division of of Emergency Medicine, Anaesthesia and Pain Medicine, Medical School, University of Western Australia, Perth, Australia
| | - A J Hua
- Division of Pharmacy, School of Allied Health, University of Western Australia, Perth, Australia
| | - B S von Ungern Sternberg
- Division of of Emergency Medicine, Anaesthesia and Pain Medicine, Medical School, University of Western Australia, Perth, Australia; Department of Anaesthesia and Pain Management, Perth's Children Hospital, Australia; Perioperative Medicine Team, Telethon Kids Institute, Perth, Australia
| | - L Y Lim
- Division of Pharmacy, School of Allied Health, University of Western Australia, Perth, Australia.
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5
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Kostyanev T, Nguyen MN, Markovska R, Stankova P, Xavier BB, Lammens C, Marteva-Proevska Y, Velinov T, Cantón R, Goossens H, Malhotra-Kumar S. Emergence of ST654 Pseudomonas aeruginosa co-harbouring bla NDM-1 and bla GES-5 in novel class I integron In1884 from Bulgaria. J Glob Antimicrob Resist 2020; 22:672-673. [PMID: 32585404 DOI: 10.1016/j.jgar.2020.06.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 05/06/2020] [Accepted: 06/10/2020] [Indexed: 11/19/2022] Open
Affiliation(s)
- Tomislav Kostyanev
- Department of Medical Microbiology, University of Antwerp, Antwerp, Belgium; Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium.
| | - M N Nguyen
- Department of Medical Microbiology, University of Antwerp, Antwerp, Belgium; Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - R Markovska
- Department of Medical Microbiology, Faculty of Medicine, Medical University of Sofia, Sofia, Bulgaria
| | - P Stankova
- Department of Medical Microbiology, Faculty of Medicine, Medical University of Sofia, Sofia, Bulgaria
| | - B B Xavier
- Department of Medical Microbiology, University of Antwerp, Antwerp, Belgium; Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - C Lammens
- Department of Medical Microbiology, University of Antwerp, Antwerp, Belgium; Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - Y Marteva-Proevska
- Central Laboratory of Microbiology, Alexandrovska University Hospital, Sofia, Bulgaria
| | - T Velinov
- Central Laboratory of Microbiology, Alexandrovska University Hospital, Sofia, Bulgaria
| | - R Cantón
- Servicio de Microbiología, Hospital Universitario Ramón y Cajal and Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain; Red Española de Investigación en Patología Infecciosa (REIPI), Madrid, Spain
| | - H Goossens
- Department of Medical Microbiology, University of Antwerp, Antwerp, Belgium; Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - S Malhotra-Kumar
- Department of Medical Microbiology, University of Antwerp, Antwerp, Belgium; Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
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6
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Du XJ, Zhao WB, Lu Q, Nguyen MN, Ziemann M, Su Y, Kiriazis H, Sadoshima J, Hu HY. 1183Beta-Adrenoceptor activation increases cardiac galectin-3 levels via the hippo signaling pathway. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0025] [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
Galectin-3 (Gal-3) is a clinical biomarker for risk of cardiovascular disease and a disease mediator forming a therapeutic target. However, the mechanism(s) that regulate cardiac expression of Gal-3 remains unknown. Activation of the sympatho-β-adrenergic system is a hallmark of heart disease, but the relationship of βAR activation and cardiac content of Gal-3 remains unknown.
Purpose
To determine the role of βAR activation in regulating cardiac Gal-3 level and the responsible mechanism focusing on the Hippo signalling pathway.
Methods
Wild-type and Gal-3 gene deleted (Gal3-KO) mice were used. To test the role of the Hippo pathway, we used transgenic (TG) mouse strains with cardiac overexpression of mammalian-20-like sterile kinase 1 (Mst1, mammalian orthology of Drosophila Hippo kinase) either in wild-type form (TG-Mst1) or dominative-negative kinase dead mutant form (TG-dnMst1). Effects of β-antagonist (isoprenaline, ISO) and antagonists were determined. We measured phosphorylation (Ser127) of YAP as a transcription co-regulator acting as the main signal output of the Hippo pathway.
Results
In wild-type mice, treatment with ISO led to a time- and dose-dependent increase in cardiac expression of Gal-3 (Fig. A) accompanied by elevated circulating Gal-3 levels (Fig. B). ISO treatment stimulated cardiac expression of Mst1 and YAP hyper-phosphorylation (i.e. inactivation, Fig. C), indicating activation of the Hippo signalling. These effects of ISO were inhibited by β-blockers (propranolol, Prop; carvedilol, Carv; Fig. D,E). Relative to non-TG controls, ISO-induced expression of Gal-3 was inhibited by 75% in TG-dnMst1 mice (inactivated Mst1), but exaggerated by 7-fold in TG-Mst1 mice (activated Mst1). Mst1-TG mice had a 45-fold increase in Gal-3 content, YAP hyper-phosphorylation and enhanced pro-fibrotic signaling. In Mst1-TG mice, whilst blood Gal-3 level was unchanged, treatment with ISO (6 mg, 2 days) evoked a marked increase in cardiac and blood Gal-3 levels. Using rat cardiomyoblasts, we showed that ISO-mediated Mst1 expression and YAP phosphorylation were PKA-dependent and that siRNA-mediated YAP knockdown led to Gal-3 upregulation. The role of Gal-3 in mediating ISO-induced cardiomyopathy was examined by treating wild-type and Gal3-KO mice with ISO (30 mg/kg, 7 days). ISO-treated wild-type mice had 8-fold increase in cardiac Gal-3, ventricular dysfunction, fibrosis, hypertrophy and activated inflammatory or fibrotic signalling. All these changes, except hypertrophy, were abolished by Gal3-KO.
beta-AR regulates galectin-3
Conclusion
βAR stimulation increases cardiac expression of Gal-3 through activation of the Hippo signalling pathway. This is accompanied by elevated circulating Gal-3 level. βAR antagonists inhibited βAR-Mst1 (Hippo) signalling and cardiac Gal-3 expression, actions likely contributing to the overall efficacy of β-blockers.
Acknowledgement/Funding
NHMRC of Australia; Nature Science Fund of China
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Affiliation(s)
- X.-J Du
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - W B Zhao
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - Q Lu
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - M N Nguyen
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - M Ziemann
- Deakin University, School of Life and Environmental Sciences, Melbourne, Australia
| | - Y Su
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - H Kiriazis
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - J Sadoshima
- New Jersey Medical School, Department of Cell Biology and Molecular Medicine Rutgers, Newark, United States of America
| | - H.-Y Hu
- Southwest Hospital, The Third Military Medical University, Department of Cardiology, Chongqing City, China
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7
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Nguyen MN, Lepage SL, Mahdi Sedighi SMS, Ghachem AG, Fulop TF, Prud'homme P, Khalil AK. P3495Revisiting the association between ageing and increased level of Troponin. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p3495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- M N Nguyen
- University Hospital of Sherbrooke (CHUS), Sherbrooke, Canada
| | - S L Lepage
- University Hospital of Sherbrooke (CHUS), Sherbrooke, Canada
| | | | - A G Ghachem
- University Hospital of Sherbrooke (CHUS), Sherbrooke, Canada
| | - T F Fulop
- University Hospital of Sherbrooke (CHUS), Sherbrooke, Canada
| | - P Prud'homme
- University Hospital of Sherbrooke (CHUS), Sherbrooke, Canada
| | - A K Khalil
- University Hospital of Sherbrooke (CHUS), Sherbrooke, Canada
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8
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Du XJ, Nguyen MN, Ziemann M, Kiriazis H, Su Y, Rafehi H, Donner D, Zhao WB, Dart AM, Sadoshima J, McMullen JR, El-Osta A. P941Galectin-3 deficiency ameliorates cardiac fibrosis and remodelling in transgenic mice with dilated cardiomyopathy. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy564.p941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- X.-J Du
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - M N Nguyen
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - M Ziemann
- Monash University, Department of Diabetes, Melbourne, Australia
| | - H Kiriazis
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - Y Su
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - H Rafehi
- Monash University, Department of Diabetes, Melbourne, Australia
| | - D Donner
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - W B Zhao
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - A M Dart
- The Alfred Hospital, Alfred Heart Centre, Melbourne, Australia
| | - J Sadoshima
- New Jersey Medical School, Department of Cell Biology and Molecular Medicine Rutgers, New Jersey, United States of America
| | - J R McMullen
- Baker IDI Heart and Diabetes Institute, Experimental Cardiology, Melbourne, Australia
| | - A El-Osta
- Monash University, Department of Diabetes, Melbourne, Australia
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9
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Nanayakkara DM, Nguyen MN, Wood SA. Deubiquitylating enzyme, USP9X, regulates proliferation of cells of head and neck cancer lines. Cell Prolif 2016; 49:494-502. [PMID: 27374971 DOI: 10.1111/cpr.12273] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Accepted: 06/02/2016] [Indexed: 12/12/2022] Open
Abstract
OBJECTIVES Truncating mutations in USP9X have been identified in oral squamous cell carcinoma patients. The aim of this study was to determine USP9X's functional role, if any, in head and neck cancer cells. MATERIALS AND METHODS USP9X was depleted/overexpressed in head and neck cancer cell line: SCC15 (tongue), CAL27 (tongue), FaDu (pharynx) and Detroit 562 (pharynx). Cell proliferation was monitored using the CyQUANT assay, and cell cycle distribution was determined by flow cytometry. Immunoblot assays were conducted to assess protein levels. RT-qPCR was performed to determine Notch and Wnt pathway target gene expression. RESULTS Our data showed a direct correlation between USP9X protein levels and proliferation, as well as Notch pathway activity in head and neck cancer cells. However, at least in FaDu, USP9X did not appear to regulate proliferation through the Notch pathway. Immunoblotting revealed a dramatic reduction in downstream targets of mTOR complex 1, namely total ribosomal protein (S6) and its phosphorylated form (pS6), when USP9X was depleted in FaDu cells. In contrast, in immortalized but non-tumorigenic HaCaT keratinocytes, USP9X depletion led to increase in cell proliferation, maintaining direct regulation of Notch activity. CONCLUSIONS The functional role of USP9X was found to be context dependent. USP9X possibly promotes head and neck cancer cell proliferation through the mTOR pathway.
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Affiliation(s)
- D M Nanayakkara
- Eskitis Institute for Drug Discovery, Griffith University, Nathan, Qld, Australia
| | - M N Nguyen
- Eskitis Institute for Drug Discovery, Griffith University, Nathan, Qld, Australia
| | - S A Wood
- Eskitis Institute for Drug Discovery, Griffith University, Nathan, Qld, Australia
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10
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Weathersby SP, Brown G, Centurion M, Chase TF, Coffee R, Corbett J, Eichner JP, Frisch JC, Fry AR, Gühr M, Hartmann N, Hast C, Hettel R, Jobe RK, Jongewaard EN, Lewandowski JR, Li RK, Lindenberg AM, Makasyuk I, May JE, McCormick D, Nguyen MN, Reid AH, Shen X, Sokolowski-Tinten K, Vecchione T, Vetter SL, Wu J, Yang J, Dürr HA, Wang XJ. Mega-electron-volt ultrafast electron diffraction at SLAC National Accelerator Laboratory. Rev Sci Instrum 2015; 86:073702. [PMID: 26233391 DOI: 10.1063/1.4926994] [Citation(s) in RCA: 138] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Ultrafast electron probes are powerful tools, complementary to x-ray free-electron lasers, used to study structural dynamics in material, chemical, and biological sciences. High brightness, relativistic electron beams with femtosecond pulse duration can resolve details of the dynamic processes on atomic time and length scales. SLAC National Accelerator Laboratory recently launched the Ultrafast Electron Diffraction (UED) and microscopy Initiative aiming at developing the next generation ultrafast electron scattering instruments. As the first stage of the Initiative, a mega-electron-volt (MeV) UED system has been constructed and commissioned to serve ultrafast science experiments and instrumentation development. The system operates at 120-Hz repetition rate with outstanding performance. In this paper, we report on the SLAC MeV UED system and its performance, including the reciprocal space resolution, temporal resolution, and machine stability.
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Affiliation(s)
- S P Weathersby
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - G Brown
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M Centurion
- University of Nebraska-Lincoln, 855 N 16th Street, Lincoln, Nebraska 68588, USA
| | - T F Chase
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R Coffee
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J Corbett
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J P Eichner
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J C Frisch
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A R Fry
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M Gühr
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - N Hartmann
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - C Hast
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R Hettel
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R K Jobe
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - E N Jongewaard
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J R Lewandowski
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R K Li
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A M Lindenberg
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - I Makasyuk
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J E May
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - D McCormick
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M N Nguyen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A H Reid
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - X Shen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | | | - T Vecchione
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - S L Vetter
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J Wu
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J Yang
- University of Nebraska-Lincoln, 855 N 16th Street, Lincoln, Nebraska 68588, USA
| | - H A Dürr
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - X J Wang
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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11
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Nishijo M, Pham TT, Nguyen ATN, Tran NN, Nakagawa H, Hoang LV, Tran AH, Morikawa Y, Ho MD, Kido T, Nguyen MN, Nguyen HM, Nishijo H. 2,3,7,8-Tetrachlorodibenzo-p-dioxin in breast milk increases autistic traits of 3-year-old children in Vietnam. Mol Psychiatry 2014; 19:1220-6. [PMID: 24637425 DOI: 10.1038/mp.2014.18] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [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] [Received: 08/02/2013] [Revised: 01/18/2014] [Accepted: 02/03/2014] [Indexed: 01/29/2023]
Abstract
Dioxin levels in the breast milk of mothers residing near a contaminated former airbase in Vietnam remain much higher than in unsprayed areas, suggesting high perinatal dioxin exposure for their infants. The present study investigated the association of perinatal dioxin exposure with autistic traits in 153 3-year-old children living in a contaminated area in Vietnam. The children were followed up from birth using the neurodevelopmental battery Bayley-III. The high-2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) exposed groups (⩾3.5 pg per g fat) showed significantly higher Autism Spectrum Rating Scale (ASRS) scores for both boys and girls than the mild-TCDD exposed groups, without differences in neurodevelopmental scores. In contrast, the high total dioxin-exposed group, indicated by polychlorinated dibenzo-p-dioxins/furans (PCDDs/Fs)--the toxic equivalents (TEQ) levels⩾17.9 pg-TEQ per g fat, had significantly lower neurodevelopmental scores than the mild-exposed group in boys, but there was no difference in the ASRS scores. The present study demonstrates a specific impact of perinatal TCDD on autistic traits in childhood, which is different from the neurotoxicity of total dioxins (PCDDs/Fs).
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Affiliation(s)
- M Nishijo
- Department of Public Health, Kanazawa Medical University, Ishikawa, Japan
| | - T T Pham
- Biomedical and Pharmaceutical Research Center, Vietnam Military Medical University, Ha Noi, Vietnam
| | - A T N Nguyen
- Department of Public Health, Kanazawa Medical University, Ishikawa, Japan
| | - N N Tran
- Department of Public Health, Kanazawa Medical University, Ishikawa, Japan
| | - H Nakagawa
- Department of Public Health, Kanazawa Medical University, Ishikawa, Japan
| | - L V Hoang
- Biomedical and Pharmaceutical Research Center, Vietnam Military Medical University, Ha Noi, Vietnam
| | - A H Tran
- Biomedical and Pharmaceutical Research Center, Vietnam Military Medical University, Ha Noi, Vietnam
| | - Y Morikawa
- School of Nursing, Kanazawa Medical University, Ishikawa, Japan
| | - M D Ho
- Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Ishikawa, Japan
| | - T Kido
- Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Ishikawa, Japan
| | - M N Nguyen
- 1] Biomedical and Pharmaceutical Research Center, Vietnam Military Medical University, Ha Noi, Vietnam [2] System Emotional Science, Graduate School of Medicine and Pharmaceutical Science, University of Toyama, Toyama, Japan
| | - H M Nguyen
- 1] Biomedical and Pharmaceutical Research Center, Vietnam Military Medical University, Ha Noi, Vietnam [2] System Emotional Science, Graduate School of Medicine and Pharmaceutical Science, University of Toyama, Toyama, Japan
| | - H Nishijo
- System Emotional Science, Graduate School of Medicine and Pharmaceutical Science, University of Toyama, Toyama, Japan
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12
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Janjetovic Z, Brozyna AA, Tuckey RC, Kim TK, Nguyen MN, Jozwicki W, Pfeffer SR, Pfeffer LM, Slominski AT. High basal NF-κB activity in nonpigmented melanoma cells is associated with an enhanced sensitivity to vitamin D3 derivatives. Br J Cancer 2011; 105:1874-84. [PMID: 22095230 PMCID: PMC3251881 DOI: 10.1038/bjc.2011.458] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Background: Melanoma is highly resistant to current modalities of therapy, with the extent of pigmentation playing an important role in therapeutic resistance. Nuclear factor-κB (NF-κB) is constitutively activated in melanoma and can serve as a molecular target for cancer therapy and steroid/secosteroid action. Methods: Cultured melanoma cells were used for mechanistic studies on NF-κB activity, utilising immunofluorescence, western blotting, EMSA, ELISA, gene reporter, and estimated DNA synthesis assays. Formalin-fixed, paraffin-embedded specimens from melanoma patients were used for immunocytochemical analysis of NF-κB activity in situ. Results: Novel 20-hydroxyvitamin (20(OH)D3) and classical 1α,25-dihydroxyvitamin D3 (1,25(OH)2D3) secosteroids inhibited melanoma cell proliferation. Active forms of vitamin D were found to inhibit NF-κB activity in nonpigmented cells, while having no effect on pigmented cells. Treatment of nonpigmented cells with vitamin D3 derivatives inhibited NF-κB DNA binding and NF-κB-dependent reporter assays, as well as inhibited the nuclear translocation of the p65 NF-κB subunit and its accumulation in the cytoplasm. Moreover, analysis of biopsies of melanoma patients showed that nonpigmented and slightly pigmented melanomas displayed higher nuclear NF-κB p65 expression than highly pigmented melanomas. Conclusion: Classical 1,25(OH)2D3 and novel 20(OH)D3 hydroxyderivatives of vitamin D3 can target NF-κB and regulate melanoma progression in nonpigmented melanoma cells. Melanin pigmentation is associated with the resistance of melanomas to 20(OH)D3 and 1,25(OH)2D3 treatment.
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Affiliation(s)
- Z Janjetovic
- Department of Pathology and Laboratory Medicine, Center for Cancer Research, University of Tennessee Health Science Center, 930 Madison Avenue, Memphis, TN 38163, USA
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13
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Abstract
Inspired by the philosophy of ancient Chinese Taoism, Xu's Bayesian ying-yang (BYY) learning technique performs clustering by harmonizing the training data (yang) with the solution (ying). In our previous work, the BYY learning technique was applied to a fuzzy cerebellar model articulation controller (FCMAC) to find the optimal fuzzy sets; however, this is not suitable for time series data analysis. To address this problem, we propose an incremental BYY learning technique in this paper, with the idea of sliding window and rule structure dynamic algorithms. Three contributions are made as a result of this research. First, an online expectation-maximization algorithm incorporated with the sliding window is proposed for the fuzzification phase. Second, the memory requirement is greatly reduced since the entire data set no longer needs to be obtained during the prediction process. Third, the rule structure dynamic algorithm with dynamically initializing, recruiting, and pruning rules relieves the "curse of dimensionality" problem that is inherent in the FCMAC. Because of these features, the experimental results of the benchmark data sets of currency exchange rates and Mackey-Glass show that the proposed model is more suitable for real-time streaming data analysis.
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14
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Abstract
Bioinformatics techniques to protein secondary structure (PSS) prediction are mostly single-stage approaches in the sense that they predict secondary structures of proteins by taking into account only the contextual information in amino acid sequences. In this paper, we propose two-stage Multi-class Support Vector Machine (MSVM) approach where a MSVM predictor is introduced to the output of the first stage MSVM to capture the sequential relationship among secondary structure elements for the prediction. By using position specific scoring matrices, generated by PSI-BLAST, the two-stage MSVM approach achieves Q3 accuracies of 78.0% and 76.3% on the RS126 dataset of 126 nonhomologous globular proteins and the CB396 dataset of 396 nonhomologous proteins, respectively, which are better than the highest scores published on both datasets to date.
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Affiliation(s)
- M N Nguyen
- BioInformatics Research Centre, School of Computer Engineering, Nanyang Technological University, Singapore 639798
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15
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Kubo K, Akemoto M, Anderson S, Aoki T, Araki S, Bane KLF, Blum P, Corlett J, Dobashi K, Emma P, Frisch J, Fukuda M, Guo Z, Hasegawa K, Hayano H, Higo T, Higurashi A, Honda Y, Iimura T, Imai T, Jobe K, Kamada S, Karataev P, Kashiwagi S, Kim E, Kobuki T, Kotseroglou T, Kurihara Y, Kuriki M, Kuroda R, Kuroda S, Lee T, Luo X, McCormick DJ, McKee B, Mimashi T, Minty M, Muto T, Naito T, Naumenko G, Nelson J, Nguyen MN, Oide K, Okugi T, Omori T, Oshima T, Pei G, Potylitsyn A, Qin Q, Raubenheimer T, Ross M, Sakai H, Sakai I, Schmidt F, Slaton T, Smith H, Smith S, Smith T, Suzuki T, Takano M, Takeda S, Terunuma N, Toge N, Turner J, Urakawa J, Vogel V, Woodley M, Yocky J, Young A, Zimmermann F. Extremely low vertical-emittance beam in the accelerator test facility at KEK. Phys Rev Lett 2002; 88:194801. [PMID: 12005637 DOI: 10.1103/physrevlett.88.194801] [Citation(s) in RCA: 3] [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: 09/18/2001] [Indexed: 05/23/2023]
Abstract
Electron beams with the lowest, normalized transverse emittance recorded so far were produced and confirmed in single-bunch-mode operation of the Accelerator Test Facility at KEK. We established a tuning method of the damping ring which achieves a small vertical dispersion and small x-y orbit coupling. The vertical emittance was less than 1% of the horizontal emittance. At the zero-intensity limit, the vertical normalized emittance was less than 2.8 x 10(-8) rad m at beam energy 1.3 GeV. At high intensity, strong effects of intrabeam scattering were observed, which had been expected in view of the extremely high particle density due to the small transverse emittance.
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Affiliation(s)
- K Kubo
- High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan
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16
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Amin NS, Nguyen MN, Oh S, Kolodner RD. exo1-Dependent mutator mutations: model system for studying functional interactions in mismatch repair. Mol Cell Biol 2001; 21:5142-55. [PMID: 11438669 PMCID: PMC87239 DOI: 10.1128/mcb.21.15.5142-5155.2001] [Citation(s) in RCA: 161] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2001] [Accepted: 04/20/2001] [Indexed: 12/24/2022] Open
Abstract
EXO1 interacts with MSH2 and MLH1 and has been proposed to be a redundant exonuclease that functions in mismatch repair (MMR). To better understand the role of EXO1 in mismatch repair, a genetic screen was performed to identify mutations that increase the mutation rates caused by weak mutator mutations such as exo1Delta and pms1-A130V mutations. In a screen starting with an exo1 mutation, exo1-dependent mutator mutations were obtained in MLH1, PMS1, MSH2, MSH3, POL30 (PCNA), POL32, and RNR1, whereas starting with the weak pms1 allele pms1-A130V, pms1-dependent mutator mutations were identified in MLH1, MSH2, MSH3, MSH6, and EXO1. These mutations only cause weak MMR defects as single mutants but cause strong MMR defects when combined with each other. Most of the mutations obtained caused amino acid substitutions in MLH1 or PMS1, and these clustered in either the ATP-binding region or the MLH1-PMS1 interaction regions of these proteins. The mutations showed two other types of interactions: specific pairs of mutations showed unlinked noncomplementation in diploid strains, and the defect caused by pairs of mutations could be suppressed by high-copy-number expression of a third gene, an effect that showed allele and overexpressed gene specificity. These results support a model in which EXO1 plays a structural role in MMR and stabilizes multiprotein complexes containing a number of MMR proteins. A similar role is proposed for PCNA based on the data presented.
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Affiliation(s)
- N S Amin
- Ludwig Institute for Cancer Research, University of California, San Diego School of Medicine, La Jolla, California 92093-0660, USA
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17
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Parker CE, Graham LB, Nguyen MN, Gladen BC, Kadiiska MB, Barrett JC, Tomer KB. An improved GC/MS-based procedure for the quantitation of the isoprostane 15-F2t-IsoP in rat plasma. Mol Biotechnol 2001; 18:105-18. [PMID: 11471453 DOI: 10.1385/mb:18:2:105] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [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: 11/11/2022]
Abstract
This article describes a procedure for the quantitation of the isoprostane 15-F2t-IsoP (9a,11a,15S-trihydroxy-(8b)-prosta-5Z,13E-dien-1-oic acid [CAS#27415-26-5] formerly known as 8-epi-PGF2a or 8-iso-PGF2a, and also as iPF2a-III). We have combined features from several earlier methods for 15-F2t-IsoP and prostaglandins, and identified and modified those steps that may lead to poor recoveries. The resulting protocol is precise and reliable, and was validated by a blind time-course study of plasma levels in rats treated with 120 and 1200 mg CCl4/kg body weight. Plasma levels of 15-F2t-IsoP, as measured according to the procedure described above, are good indicators of acute oxidative stress as induced by CCl4. The precision of the measurements allows detection of elevated plasma 15-F2t-IsoP levels as long as 16 h after an acute exposure of 120 mg CCl4/kg body weight, and 2 h after an exposure of 1 mg CCl4/kg body weight. The results of this low-dose, pilot study suggest that this method has sufficient analytical precision to allow the detection of the small changes in plasma isoprostane levels, which result from chronic and/or lower-level exposures to agents causing oxidative stress.
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Affiliation(s)
- C E Parker
- Laboratory of Structural Biology, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, USA
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18
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Van Der Vliet A, Nguyen MN, Shigenaga MK, Eiserich JP, Marelich GP, Cross CE. Myeloperoxidase and protein oxidation in cystic fibrosis. Am J Physiol Lung Cell Mol Physiol 2000; 279:L537-46. [PMID: 10956629 DOI: 10.1152/ajplung.2000.279.3.l537] [Citation(s) in RCA: 154] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Cystic fibrosis (CF) is associated with chronic pulmonary inflammation and progressive lung dysfunction, possibly associated with the formation of neutrophil myeloperoxidase (MPO)-derived oxidants. Expectorated sputum specimens from adult CF patients were analyzed for MPO characteristic protein modifications and found to contain large amounts of active MPO as well as high levels of protein-associated 3-chlorotyrosine and 3,3'-dityrosine, products that result from MPO activity, compared with expectorated sputum from non-CF subjects. Sputum levels of nitrite (NO(2)(-)) and nitrate (NO(3)(-)), indicating local production of nitric oxide (NO. ), were not elevated but in fact were slightly reduced in CF. However, there was a slight increase in protein-associated 3-nitrotyrosine in CF sputum compared with controls, reflecting the formation of reactive nitrogen intermediates, possibly through MPO-catalyzed oxidation of NO(2)(-). CF sputum MPO was found to contribute to oxidant-mediated cytotoxicity toward cultured tracheobronchial epithelial cells; however, peroxidase-dependent protein oxidation occurred primarily within sputum proteins, suggesting scavenging of MPO-derived oxidants by CF mucus and perhaps formation of secondary cytotoxic products within CF sputum. Our findings demonstrate the formation of MPO-derived oxidizing and possibly nitrating species within the respiratory tract of subjects with CF, which collectively may contribute to bronchial injury and respiratory failure in CF.
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Affiliation(s)
- A Van Der Vliet
- Division of Pulmonary/Critical Care Medicine, Department of Internal Medicine, University of California, Davis, California 95616, USA.
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19
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Abstract
The aim of this study was to analyze whether the intention to quit smoking was associated with other lifestyle habits healthy for the heart, namely a low-fat diet and regular exercise, using variables suggested by the theory of planned behavior. Self-administered postal questionnaires were sent to 3,200 men 30 to 60 years of age residing in Laval, Quebec. With a response rate of 70.9%, 671 respondents (29.6%) were smokers. A significant proportion (43%) had all three risk behaviors--smoking, a high-fat diet, and sedentariness, and 42% had two--smoking and one of the other behaviors. The remaining had a single risk behavior, namely smoking. Regression analysis suggested that a healthy diet and exercise had no significant influence on the intention to quit smoking. However, men who had a stronger intention to quit smoking than others had a more favorable attitude toward the behavior, a stronger perception of approval in achieving it on the part of important referents, stronger perceived behavioral control, and were among those who smoked fewer cigarettes per day, but had made more attempts to quit. These results can assist in designing better heart-health intervention programs for this high-risk population.
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Affiliation(s)
- M N Nguyen
- Public Health Department of Laval, Canada
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20
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Nguyen MN, Potvin L, Otis J. Regular exercise in 30- to 60-year-old men: combining the stages-of-change model and the theory of planned behavior to identify determinants for targeting heart health interventions. J Community Health 1997; 22:233-46. [PMID: 9247847 DOI: 10.1023/a:1025196218566] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The theory of planned behavior and the stages-of-change model were used to gain a clearer understanding of the factors associated with regular exercise in order to plan more effective programs in heart disease prevention. The study was conducted using a self-administered postal questionnaire sent to a sample of 2,269 men 30 to 60 years of age. Nearly a quarter (23.3%) of respondents were physically inactive, of whom 10.5% were in the precontemplation and 12.8% in the contemplation stages; 42.1% exercised less than twice a week, of whom 22.4% were in the preparation I and 19.7% in the preparation II stages. Only 34.6% were in the action stage, exercising regularly for at least 20 minutes twice a week or more with the intention of continuing to do so. Logistic regression indicated that the variables derived from the theory of planned behavior, namely attitude, subjective norm and perceived behavioral control, were differently associated with the stages of behavior. Perceived behavioral control was strongly significant in all stages. Attitude was related with stages in which individuals have intention of exercising (contemplation and preparation II). In contrast, subjective norm seemed to be associated with stages in which individuals have no intention of doing so (precontemplation and preparation I). By identifying the specific needs of sub-groups, the results can help define programs most likely to accelerate men to the stage of regular exercise, part of an effective strategy for heart health promotion in this high-risk population.
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Affiliation(s)
- M N Nguyen
- Public Health Department of Laval, (Québec) Canada
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21
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Nguyen MN, Béland F, Otis J, Potvin L. Diet and exercise profiles of 30- to 60-year-old male smokers: implications for community heart health programs. J Community Health 1996; 21:107-21. [PMID: 8728359 DOI: 10.1007/bf01682302] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [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: 02/01/2023]
Abstract
The aim of this study was to estimate the prevalence of diet and exercise behaviors in middle-aged male smokers and identify their determinants of behaviors, with the ultimate goal of designing more effective interventions in a community heart health program. Self-administered, postal questionnaires produced a sample of n = 671 male smokers, 30 to 60 years of age residing in Laval, Quebec's second most populous city. Variables for the study were derived from the theory of planned behavior. Correspondence analysis explained 65% of the variance, classifying smokers into five groups based on diet and exercise behavior. Group 1, smokers with diet and exercise behaviors deemed inadequate for heart health, comprised 43% of the total. Groups 2 and 3, smokers with a diet deemed inadequate or needing improvement respectively, and Group 4, smokers with inadequate exercise, comprised 42% of the total. Group 5, smokers with neither of the other high-risk behaviors, comprised 15% of the total. Four significant variables contrasted Groups 1 to 4 with group 5: age, number of cigarettes smoked daily, and perceived behavioral control (PBC) in both diet and exercise. However, coefficients for age and smoking were weak for all groups. Coefficients for PBC in diet were high and negative only for smokers with an inadequate one. For PBC in exercise, they were high and negative only for smokers who exercised inadequately. Intervention groups based on specific deficiencies in diet and exercise behaviors were then identified. Therefore, the results suggest that smoking cessation programs may be made more effective by targeting specific sub-groups and by providing resources and opportunities to counteract the lack of perceived behavioral control in middle-aged male smokers vis-a-vis diet and exercise.
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Affiliation(s)
- M N Nguyen
- Public Health Department of Laval, Québec, Canada
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Nguyen MN, Otis J, Potvin L. Determinants of intention to adopt a low-fat diet in men 30 to 60 years old: implications for heart health promotion. Am J Health Promot 1996; 10:201-7. [PMID: 10163300 DOI: 10.4278/0890-1171-10.3.201] [Citation(s) in RCA: 35] [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: 11/17/2022]
Abstract
PURPOSE The purpose of the study was to identify the determinants of intention to have a low-fat diet in 30- to 60-year-old men. DESIGN The survey design was cross-sectional and consisted of a self-administered questionnaire. The dependent variable was the intention to have a low-fat diet within the next 4 months, and the independent variables were those suggested by the theory of planned behavior. SETTING The study population was drawn from three districts representing a modal sample of Laval, the second most populous city (N = 314,398) in the province of Quebec. SUBJECTS The sample comprised 3200 people. Of the 3200 questionnaires sent out, 2583 were received and 2269 were eligible (i.e., were answered by 30- to 60-year-old men), giving a response rate of 70.9%. Of the 2269 questionnaires, 430 were incomplete, resulted in 1839 being usable for analysis. MEASURES Multiple regression analysis was conducted to determine the influence of the independent variables on the dependent variable, the intention to have a low-fat diet. The independent variables were (1) direct and indirect determinants of intention as suggested in the theory of planned behavior and (2) sociodemographic and concomitant variables and their interactions. Discriminant analysis was used on the significant variables obtained in the regression to establish the cognitive profile of respondents' intention, strong or weak. RESULTS In the final model, five variables 51% of the total variance. Respondents who had a stronger intention perceived that their important referents would approve them having a low-fat diet. They scored higher in seeing the advantages of adopting the target behavior and had a more positive attitude toward the behavior. They also perceived themselves as having control over the target behavior, and scored higher in terms of recognizing the perceived power of this control factor. CONCLUSIONS The results suggests that the theory of planned behavior can be an effective tool in the planning of heart health promotion. They indicate that low-fat diet programs for men should target the work site and peer-group organizations, and place emphasis on adapting usual recipes. Though accenting the health and nutritional benefits of a low-fat diet, messages should appeal to emotion as well as reason.
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Affiliation(s)
- M N Nguyen
- Direction de la sante publique de Laval, Laval, Quebec, Canada
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Abstract
PURPOSE The purpose of this study was to determine whether attitudes and other variables would be associated with intention to use condoms in sexually-inactive male adolescents. METHODS The survey was conducted from April to June 1989 on a sample of 879 sexually-inactive boys aged 12-19 years registered in secondary schools in Laval, Quebec. RESULTS The major findings of the study were that: (1) information on condoms provided by peers was significantly associated with the intention to use condoms; (2) information provided by schools, while not significant in the final model, was positively associated with younger adolescents' intention to use condoms; and (3) sexually-inactive male adolescents in a less committed couple relationship had a greater intention to use condoms. CONCLUSIONS The results of this study highlight the importance of peer instructors as a source of information on condoms, as well as that of teachers and health professionals from the school environment. Other channels of communication, however, need to be developed particularly for older sexually-inactive adolescents who may be impervious to this latter source. The findings also underline the necessity to make sexually-inactive adolescents in stable couple relationships more aware of their potential vulnerability to STDs and AIDS should they commence sexual relations.
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Affiliation(s)
- M N Nguyen
- Department of Social and Preventive Medicine, Universite de Montreal, Canada
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Nguyen MN, Potvin L, Philibert L, O'Loughlin J, Moisan J, Paradis G. [The sale of tobacco to minors and the availability of healthy food in rural, suburban and urban service stations in Quebec]. Can J Public Health 1995; 86:377-9. [PMID: 8932474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- M N Nguyen
- Direction de la sante publique, RRSSS de Laval
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Nguyen MN, Potvin L, Otis J. [Is municipal regulation of tobacco use applicable to Laval, Quebec?]. Can J Public Health 1995; 86:266-8. [PMID: 7497414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- M N Nguyen
- Direction de la santé publique, Régie régionale de la santé et des services sociaux de Laval, Chomedey
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Abstract
To develop effective interventions in the Fabreville Heart Health Program, a behavioral diagnosis was conducted on a sample of 1,600 men 30 to 60 years of age residing in the Fabreville district of Laval, Quebec's second most populous city. The response rate of the self-administered postal questionnaire was 73.5%. The results indicate that dietary fat consumption, smoking and a sedentary lifestyle were more prevalent among the younger respondents, particularly those less-educated. The results underline the importance of segmenting the target population so that heart health interventions can respond to the specific needs of each sub-population. Furthermore, the data seem to suggest the need to adapt educational messages to the target lifestyle habits. The results showed that in terms of diet, consumption of meat and dairy products contributed the most to fat intake. Of the 30% who were smokers, a large proportion would be reluctant to stop the habit; 20% smoked 26 cigarettes or more a day, and more than half had already tried once or more to stop. Although 60% of respondents indicated they engaged in physical activity, only 37.0% did it regularly. These results demonstrate the need to clearly target specific behaviours and subgroups in our promotion messages for a healthy heart.
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Affiliation(s)
- M N Nguyen
- Public Health Department of Laval, Québec, Canada
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Nguyen MN, Potvin L, O'Loughlin J, Philibert L, Moisan J, Paradis G, Tremblay M. [Do grocery shops help the consumer choose foods that protect the health of the heart? A preliminary study]. Can J Public Health 1995; 86:185-7. [PMID: 7671204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Abstract
PURPOSE The purpose of this study was to determine the influence of attitudes and other variables on the intention to use condoms in sexually active male adolescents. METHODS The survey was conducted from April to June 1989 on a sample of 433 sexually active boys aged 12-19 years registered in secondary schools in Laval, Quebec. RESULTS Information on condoms provided by parents, peers, school, or media had no positive effect on male adolescents' intention to use condoms. Having a favorable attitude towards contraceptive responsibility, however, was significantly associated with the outcome variable. Endorsement of this responsibility seemed short-lived being replaced by the birth control pill in older adolescents. The study also found that in younger adolescents, intention to use condoms was significantly associated with supportive parental attitudes. CONCLUSIONS The results of this study highlight the importance of developing strategies to encourage sexually active male adolescents to assume greater responsibility for using condoms, and suggest that in order for programs to be effective, STD and acquired immunodeficiency syndrome prevention should be done at younger ages while encouraging parents to take a greater role in sex education.
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Affiliation(s)
- M N Nguyen
- Department of Social and Preventive Medicine, Faculty of Medicine, Université de Montréal, Québec, Canada
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