1
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Mikhaylova V, Rzepka M, Kawamura T, Xia Y, Chang PL, Zhou S, Paasch A, Pham L, Modi N, Yao L, Perez-Agustin A, Pagans S, Boles TC, Lei M, Wang Y, Garcia-Bassets I, Chen Z. Targeted phasing of 2-200 kilobase DNA fragments with a short-read sequencer and a single-tube linked-read library method. Sci Rep 2024; 14:7988. [PMID: 38580715 PMCID: PMC10997766 DOI: 10.1038/s41598-024-58733-0] [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: 08/15/2023] [Accepted: 04/02/2024] [Indexed: 04/07/2024] Open
Abstract
In the human genome, heterozygous sites refer to genomic positions with a different allele or nucleotide variant on the maternal and paternal chromosomes. Resolving these allelic differences by chromosomal copy, also known as phasing, is achievable on a short-read sequencer when using a library preparation method that captures long-range genomic information. TELL-Seq is a library preparation that captures long-range genomic information with the aid of molecular identifiers (barcodes). The same barcode is used to tag the reads derived from the same long DNA fragment within a range of up to 200 kilobases (kb), generating linked-reads. This strategy can be used to phase an entire genome. Here, we introduce a TELL-Seq protocol developed for targeted applications, enabling the phasing of enriched loci of varying sizes, purity levels, and heterozygosity. To validate this protocol, we phased 2-200 kb loci enriched with different methods: CRISPR/Cas9-mediated excision coupled with pulse-field electrophoresis for the longest fragments, CRISPR/Cas9-mediated protection from exonuclease digestion for mid-size fragments, and long PCR for the shortest fragments. All selected loci have known clinical relevance: BRCA1, BRCA2, MLH1, MSH2, MSH6, APC, PMS2, SCN5A-SCN10A, and PKI3CA. Collectively, the analyses show that TELL-Seq can accurately phase 2-200 kb targets using a short-read sequencer.
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Affiliation(s)
| | - Madison Rzepka
- Universal Sequencing Technology Corp., Carlsbad, CA, 92011, USA
| | | | - Yu Xia
- Universal Sequencing Technology Corp., Carlsbad, CA, 92011, USA
| | - Peter L Chang
- Universal Sequencing Technology Corp., Carlsbad, CA, 92011, USA
| | | | - Amber Paasch
- Universal Sequencing Technology Corp., Carlsbad, CA, 92011, USA
| | - Long Pham
- Universal Sequencing Technology Corp., Carlsbad, CA, 92011, USA
| | - Naisarg Modi
- Universal Sequencing Technology Corp., Carlsbad, CA, 92011, USA
| | - Likun Yao
- Department of Medicine, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Adrian Perez-Agustin
- Department of Medical Sciences, School of Medicine, University of Girona, Girona, Spain
| | - Sara Pagans
- Department of Medical Sciences, School of Medicine, University of Girona, Girona, Spain
| | | | - Ming Lei
- Universal Sequencing Technology Corp., Canton, MA, 02021, USA
| | - Yong Wang
- Universal Sequencing Technology Corp., Canton, MA, 02021, USA
| | | | - Zhoutao Chen
- Universal Sequencing Technology Corp., Carlsbad, CA, 92011, USA.
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2
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Cowlishaw S, Gibson K, Alexander S, Howard A, Agathos J, Strauven S, Chisholm K, Fredrickson J, Pham L, Lau W, O’Donnell ML. Improving mental health following multiple disasters in Australia: a randomized controlled trial of the Skills for Life Adjustment and Resilience (SOLAR) programme. Eur J Psychotraumatol 2023; 14:2284032. [PMID: 38073550 PMCID: PMC10993813 DOI: 10.1080/20008066.2023.2284032] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 10/20/2023] [Indexed: 12/18/2023] Open
Abstract
Background: The mental health impacts of climate change-related disasters are significant. However, access to mental health services is often limited by the availability of trained clinicians. Although building local community capability for the mental health response is often prioritised in policy settings, the lack of evidence-based programs is problematic. The aim of this study was to test the efficacy of the Skills for Life Adjustment and Resilience programme (SOLAR) delivered by trained local community members following compound disasters (drought, wildfires, pandemic-related lockdowns) in Australia.Method: Thirty-six community members were trained to deliver the SOLAR programme, a skills-based, trauma informed, psychosocial programme. Sixty-six people with anxiety, depression and/or posttraumatic stress symptoms, and impairment were randomised into the SOLAR programme or a Self-Help condition. They were assessed pre, post and two months following the interventions. The SOLAR programme was delivered across five 1-hourly sessions (either face to face or virtually). Those in the Self-Help condition received weekly emails with self-help information including links to online educational videos.Results: Multigroup analyses indicated that participants in the SOLAR condition experienced significantly lower levels of anxiety and depression, and PTSD symptom severity between pre - and post-intervention (T1 to T2), relative to the Self-Help condition, while controlling for scores at intake. These differences were not statistically different at follow-up. The SOLAR programme was associated with large effect size improvements in posttraumatic stress symptoms over time.Conclusion: The SOLAR programme was effective in improving anxiety, depression and posttraumatic stress symptoms over time. However, by follow-up the size of the effect was similar to an active self-help condition. Given the ongoing stressors in the community associated with compounding disasters it may be that booster sessions would have been useful to sustain programme impact.Trial registration: Australian New Zealand Clinical Trials Registry identifier: ACTRN12621000283875..
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Affiliation(s)
- S. Cowlishaw
- Phoenix Australia - Centre for Posttraumatic Mental Health, Carlton, Australia
- Department of Psychiatry, The University of Melbourne, Parkville, Australia
| | - K. Gibson
- Phoenix Australia - Centre for Posttraumatic Mental Health, Carlton, Australia
- Department of Psychiatry, The University of Melbourne, Parkville, Australia
| | - S. Alexander
- Phoenix Australia - Centre for Posttraumatic Mental Health, Carlton, Australia
- Department of Psychiatry, The University of Melbourne, Parkville, Australia
| | - A. Howard
- Phoenix Australia - Centre for Posttraumatic Mental Health, Carlton, Australia
- Department of Psychiatry, The University of Melbourne, Parkville, Australia
| | - J. Agathos
- Phoenix Australia - Centre for Posttraumatic Mental Health, Carlton, Australia
- Department of Psychiatry, The University of Melbourne, Parkville, Australia
| | - S. Strauven
- Phoenix Australia - Centre for Posttraumatic Mental Health, Carlton, Australia
- Department of Psychiatry, The University of Melbourne, Parkville, Australia
| | - K. Chisholm
- Phoenix Australia - Centre for Posttraumatic Mental Health, Carlton, Australia
- Department of Psychiatry, The University of Melbourne, Parkville, Australia
| | - J. Fredrickson
- Phoenix Australia - Centre for Posttraumatic Mental Health, Carlton, Australia
- Department of Psychiatry, The University of Melbourne, Parkville, Australia
| | - L. Pham
- Phoenix Australia - Centre for Posttraumatic Mental Health, Carlton, Australia
- Department of Psychiatry, The University of Melbourne, Parkville, Australia
| | - W. Lau
- Phoenix Australia - Centre for Posttraumatic Mental Health, Carlton, Australia
- Department of Psychiatry, The University of Melbourne, Parkville, Australia
| | - M. L. O’Donnell
- Phoenix Australia - Centre for Posttraumatic Mental Health, Carlton, Australia
- Department of Psychiatry, The University of Melbourne, Parkville, Australia
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3
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Changchit C, Changchit C, Cutshall R, Pham L, Rao M. Understanding the Determinants of Customer Intention to Use Mobile Payment. Journal of Global Information Management 2023. [DOI: 10.4018/jgim.319740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
Previous studies on the intention to use mobile payment were mainly conducted using traditional technology acceptance models, which focus on positive factors and ignore negative factors influencing the intention to use mobile payment in both developed and developing countries. This study is conducted in a newly emerging country, Vietnam – a trusted destination for multinational companies to do business and reposition their global supply chains. With the integration of positive and negative factors into an extended research model to examine their influence on the intention to use mobile payment, the results show that perceived privacy and perceived security contribute to overall perceived risk. Moreover, perceived risk and perceived compatibility are two determinants of intention to use mobile payment. Theoretical and managerial implications are drawn and directions for future research are outlined.
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Affiliation(s)
| | | | | | - Long Pham
- Texas A&M University, Corpus Christi, USA
| | - Mohan Rao
- Texas A&M University, Corpus Christi, USA
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4
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Mikhaylova V, Rzepka M, Kawamura T, Xia Y, Chang PL, Zhou S, Pham L, Modi N, Yao L, Perez-Agustin A, Pagans S, Boles TC, Lei M, Wang Y, Garcia-Bassets I, Chen Z. Targeted Phasing of 2-200 Kilobase DNA Fragments with a Short-Read Sequencer and a Single-Tube Linked-Read Library Method. bioRxiv 2023:2023.03.05.531179. [PMID: 36945366 PMCID: PMC10028795 DOI: 10.1101/2023.03.05.531179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Abstract
In the human genome, heterozygous sites are genomic positions with different alleles inherited from each parent. On average, there is a heterozygous site every 1-2 kilobases (kb). Resolving whether two alleles in neighboring heterozygous positions are physically linked-that is, phased-is possible with a short-read sequencer if the sequencing library captures long-range information. TELL-Seq is a library preparation method based on millions of barcoded micro-sized beads that enables instrument-free phasing of a whole human genome in a single PCR tube. TELL-Seq incorporates a unique molecular identifier (barcode) to the short reads generated from the same high-molecular-weight (HMW) DNA fragment (known as 'linked-reads'). However, genome-scale TELL-Seq is not cost-effective for applications focusing on a single locus or a few loci. Here, we present an optimized TELL-Seq protocol that enables the cost-effective phasing of enriched loci (targets) of varying sizes, purity levels, and heterozygosity. Targeted TELL-Seq maximizes linked-read efficiency and library yield while minimizing input requirements, fragment collisions on microbeads, and sequencing burden. To validate the targeted protocol, we phased seven 180-200 kb loci enriched by CRISPR/Cas9-mediated excision coupled with pulse-field electrophoresis, four 20 kb loci enriched by CRISPR/Cas9-mediated protection from exonuclease digestion, and six 2-13 kb loci amplified by PCR. The selected targets have clinical and research relevance (BRCA1, BRCA2, MLH1, MSH2, MSH6, APC, PMS2, SCN5A-SCN10A, and PKI3CA). These analyses reveal that targeted TELL-Seq provides a reliable way of phasing allelic variants within targets (2-200 kb in length) with the low cost and high accuracy of short-read sequencing.
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Affiliation(s)
| | - Madison Rzepka
- Universal Sequencing Technology Corp., Carlsbad, CA 92011, USA
| | | | - Yu Xia
- Universal Sequencing Technology Corp., Carlsbad, CA 92011, USA
| | - Peter L. Chang
- Universal Sequencing Technology Corp., Carlsbad, CA 92011, USA
| | | | - Long Pham
- Universal Sequencing Technology Corp., Carlsbad, CA 92011, USA
| | - Naisarg Modi
- Universal Sequencing Technology Corp., Carlsbad, CA 92011, USA
| | - Likun Yao
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093 USA
| | - Adrian Perez-Agustin
- Department of Medical Sciences, School of Medicine, University of Girona, Girona, Spain
| | - Sara Pagans
- Department of Medical Sciences, School of Medicine, University of Girona, Girona, Spain
| | | | - Ming Lei
- Universal Sequencing Technology Corp., Canton, MA 02021, USA
| | - Yong Wang
- Universal Sequencing Technology Corp., Canton, MA 02021, USA
| | | | - Zhoutao Chen
- Universal Sequencing Technology Corp., Carlsbad, CA 92011, USA
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5
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Fleury Curado T, Pham L, Freire C, Amorim M, Abdelwahab M, Huang A, Taheri N, Hong Y, Dedhia R, Liu S, Capasso R, Polotsky V, Eisele D, Schwartz A. Changes in Tongue Morphology Predict Responses in Pharyngeal Patency to Selective Hypoglossal Nerve Stimulation. Sleep Med 2022. [DOI: 10.1016/j.sleep.2022.05.647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Fuchs C, Stalnaker K, Wang Y, Pham L, Dalgard C, Cho S, Anderson R, Meyerle J, Tam J. 775 Structural and molecular similarities between plantar and wound keratinocytes - is the foot a chronic wound? J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.05.788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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7
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Limbu YB, Gautam RK, Pham L. The Health Belief Model Applied to COVID-19 Vaccine Hesitancy: A Systematic Review. Vaccines (Basel) 2022; 10:vaccines10060973. [PMID: 35746581 PMCID: PMC9227551 DOI: 10.3390/vaccines10060973] [Citation(s) in RCA: 77] [Impact Index Per Article: 38.5] [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: 05/26/2022] [Revised: 06/14/2022] [Accepted: 06/16/2022] [Indexed: 01/27/2023] Open
Abstract
This study systematically analyzes the research that used the Health Belief Model (HBM) as a theoretical basis to examine the influence of HBM constructs on COVID-19 vaccine hesitancy. Following PRISMA guidelines, PubMed, Web of Science, Google Scholar, and Scopus were searched for quantitative studies. Sixteen studies with 30,242 participants met inclusion criteria. The prevalence of COVID-19 vaccine hesitancy was 33.23% (95% CI 24.71–41.39%). Perceived barriers and perceived benefits were the most common HBM constructs that were significantly associated with vaccine hesitancy. While perceived benefits was inversely associated, a positive association was found between perceived barriers and vaccine hesitancy. Other HBM constructs that were frequently examined and inversely associated were perceived susceptibility, cues to action, perceived severity, and self-efficacy. The most common HBM modifying factor that was directly associated with COVID-19 vaccine hesitancy was gender, followed by education, age, geographical locations, occupation, income, employment, marital status, race, and ethnicity; however, a few studies report inconsistent results. Other modifying variables that influenced vaccine hesitancy were knowledge of COVID-19, prior diagnosis of COVID-19, history of flu vaccination, religion, nationality, and political affiliation. The results show that HBM is useful in predicting COVID-19 vaccine hesitancy.
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Affiliation(s)
- Yam B. Limbu
- Feliciano School of Business, Montclair State University, 1 Normal Ave, Montclair, NJ 07043, USA
- Correspondence: ; Tel.: +973-655-3361; Fax: +973-655-7673
| | - Rajesh K. Gautam
- Department of Anthropology, Dr. Harisingh Gour Central University, Sagar 470003, India;
| | - Long Pham
- Department of Decision Sciences and Economics, College of Business, Texas A&M University at Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX 78412, USA;
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8
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Ahamed AFMJ, Pham L. Online Retailer Reputation, Satisfaction, and Trust as Catalysts in the Consumer Perceptions of Ethics on Online Retailers and Repurchase Intention. International Journal of E-Adoption 2021. [DOI: 10.4018/ijea.2021070101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This research investigates the effect of consumer perceptions regarding the ethics of online retailers (CPEOR) on repurchase intention through reputation, satisfaction, and trust. The authors performed structural equation model analysis with SmartPLS on a sample of 458 responses collected from Vietnamese consumers. They found that CPEOR has a significant positive effect on reputation, satisfaction, and trust. As expected, trust and satisfaction directly predict repurchase intention; however, reputation does not directly follow this pattern. Instead, two prosocial constructs, namely trust and satisfaction, channel the effect of reputation on repurchase intention. Contrary to the conventional understanding that a favourable reputation will predict higher consumer trust, they found a negative correlation between these two factors. The managerial and theoretical contributions of the research and direction for future research are highlighted.
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Affiliation(s)
| | - Long Pham
- University of Louisiana at Monroe, USA
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9
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Chen Z, Pham L, Wu TC, Mo G, Xia Y, Chang PL, Porter D, Phan T, Che H, Tran H, Bansal V, Shaffer J, Belda-Ferre P, Humphrey G, Knight R, Pevzner P, Pham S, Wang Y, Lei M. Erratum: Ultralow-input single-tube linked-read library method enables short-read second-generation sequencing systems to routinely generate highly accurate and economical long-range sequencing information. Genome Res 2021; 31:934. [PMID: 33941606 DOI: 10.1101/gr.275614.121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Rivas S, Pham L, Nguyen K. Modèle physiologique pharmacocinétique (PBPK) appliqué au paracétamol en condition de surdosage chez les enfants obèses : une revue systématique et un protocole d’étude. Toxicologie Analytique et Clinique 2021. [DOI: 10.1016/j.toxac.2020.10.083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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11
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Abstract
This study examines the applicability of an extended technology acceptance model (TAM) that incorporates trust, perceived risk, and self-enhancement as antecedents to the TAM constructs. Data collected from 299 Vietnamese online consumers, through a self-administered survey, were entered into a structural equation model using AMOS 23 to establish causality. The results partially confirm the applicability of TAM to the online shopping intentions of Vietnamese consumer, though contrary to expectations, perceived ease of use does not predict behavioral intentions. Trust and self-enchantment fit well with the TAM; the inclusion of perceived risk as an antecedent is questionable. The findings offer new opportunities for explaining TAM theory in light of Schwartz's value dimensions. This article thus concludes with a discussion of the research contributions and implications.
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Affiliation(s)
| | - Yam Limbu
- Feliciano School of Business, Montclair State University, USA
| | - Long Pham
- School of Management, University of Louisiana at Monroe, USA & Department of Economics and Management, Thuyloi University, Hanoi, Vietnam
| | - Ha Van Nguyen
- Faculty of Business Administration, Banking Academy, Hanoi, Vietnam
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12
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Chen Z, Pham L, Wu TC, Mo G, Xia Y, Chang PL, Porter D, Phan T, Che H, Tran H, Bansal V, Shaffer J, Belda-Ferre P, Humphrey G, Knight R, Pevzner P, Pham S, Wang Y, Lei M. Ultralow-input single-tube linked-read library method enables short-read second-generation sequencing systems to routinely generate highly accurate and economical long-range sequencing information. Genome Res 2020; 30:898-909. [PMID: 32540955 PMCID: PMC7370886 DOI: 10.1101/gr.260380.119] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 06/10/2020] [Indexed: 02/06/2023]
Abstract
Long-range sequencing information is required for haplotype phasing, de novo assembly, and structural variation detection. Current long-read sequencing technologies can provide valuable long-range information but at a high cost with low accuracy and high DNA input requirements. We have developed a single-tube Transposase Enzyme Linked Long-read Sequencing (TELL-seq) technology, which enables a low-cost, high-accuracy, and high-throughput short-read second-generation sequencer to generate over 100 kb of long-range sequencing information with as little as 0.1 ng input material. In a PCR tube, millions of clonally barcoded beads are used to uniquely barcode long DNA molecules in an open bulk reaction without dilution and compartmentation. The barcoded linked-reads are used to successfully assemble genomes ranging from microbes to human. These linked-reads also generate megabase-long phased blocks and provide a cost-effective tool for detecting structural variants in a genome, which are important to identify compound heterozygosity in recessive Mendelian diseases and discover genetic drivers and diagnostic biomarkers in cancers.
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Affiliation(s)
- Zhoutao Chen
- Universal Sequencing Technology Corporation, Carlsbad, California 92011, USA
| | - Long Pham
- Universal Sequencing Technology Corporation, Carlsbad, California 92011, USA
| | - Tsai-Chin Wu
- Universal Sequencing Technology Corporation, Carlsbad, California 92011, USA
| | - Guoya Mo
- Universal Sequencing Technology Corporation, Carlsbad, California 92011, USA
| | - Yu Xia
- Universal Sequencing Technology Corporation, Carlsbad, California 92011, USA
| | - Peter L Chang
- Universal Sequencing Technology Corporation, Carlsbad, California 92011, USA
| | - Devin Porter
- Universal Sequencing Technology Corporation, Carlsbad, California 92011, USA
| | - Tan Phan
- Bioturing Incorporated, San Diego, California 92121, USA
| | - Huu Che
- Bioturing Incorporated, San Diego, California 92121, USA
| | - Hao Tran
- Bioturing Incorporated, San Diego, California 92121, USA.,Faculty of Information Technology, University of Science, Vietnam National University, Ho Chi Minh City, 700 000 Vietnam
| | - Vikas Bansal
- Department of Pediatrics, University of California San Diego, La Jolla, California 92161, USA
| | - Justin Shaffer
- Center for Microbiome Innovation and Departments of Pediatrics, Bioengineering, and Computer Science and Engineering, University of California San Diego, La Jolla, California 92093, USA
| | - Pedro Belda-Ferre
- Center for Microbiome Innovation and Departments of Pediatrics, Bioengineering, and Computer Science and Engineering, University of California San Diego, La Jolla, California 92093, USA
| | - Greg Humphrey
- Center for Microbiome Innovation and Departments of Pediatrics, Bioengineering, and Computer Science and Engineering, University of California San Diego, La Jolla, California 92093, USA
| | - Rob Knight
- Center for Microbiome Innovation and Departments of Pediatrics, Bioengineering, and Computer Science and Engineering, University of California San Diego, La Jolla, California 92093, USA
| | - Pavel Pevzner
- Department of Computer Science and Engineering, University of California San Diego, La Jolla, California 92093, USA
| | - Son Pham
- Bioturing Incorporated, San Diego, California 92121, USA
| | - Yong Wang
- Universal Sequencing Technology Corporation, Canton, Massachusetts 02021, USA
| | - Ming Lei
- Universal Sequencing Technology Corporation, Canton, Massachusetts 02021, USA
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Abstract
With mobile technologies' rapid development involving wireless networks and internet infrastructure, e-commerce has been evolving into a new, more significant phase: mobile commerce. Businesses throughout the world are highly motivated to invest in mobile commerce infrastructure and deploy their mobile commerce strategies as a source of sustainable competitive advantage to maintain existing and attract new customers. As probably the first systematic and comprehensive effort to date, this study analyzes the factors affecting customers' intention to use mobile commerce in Vietnam. The results show that perceived ease of use, perceived usefulness, variety of services, and trialability have both direct and indirect positive (via perceived usefulness) impacts on intention to use mobile commerce, while trust and social influence have indirect positive impacts on intention to use mobile commerce in Vietnam. Cost does not have any impact on intention to use mobile commerce in Vietnam. The results of this study are also compared with that of studies on mobile commerce conducted in China and Malaixia by Chong et al. Theoretical and practical implications, especially for helping businesses understand how to capture more customers in a rapidly developing country, Vietnam, are discussed.
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Affiliation(s)
- Nhuong Bui
- National Economics University, Hanoi, Vietnam
| | - Long Pham
- University of Louisiana, Monroe, USA & Thuyloi University, Hanoi, Vietnam
| | | | | | - Hanh Le
- University of Louisiana, Monroe, USA
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14
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Abstract
Purpose
This study aims to examine relationships between corporate social responsibility (CSR) toward two key stakeholder groups – patients and society and hospital brand advocacy, and the mediating role of trust and patient-hospital identification (PHI) and the moderating role of hospital type on these associations.
Design/methodology/approach
The sample of 455 hospital patients was surveyed in Vietnam.
Findings
The results suggest that both CSR toward society and patients are positively related to brand advocacy. The influence of CSR toward patients on brand advocacy was stronger for private hospitals than public hospitals. Trust and PHI independently and partially mediate relationships between both stakeholder groups of CSR and brand advocacy with the exception of the trust, which fully mediates the relationship between CSR toward society and brand advocacy. Trust and PHI serve as serial mediators.
Practical implications
Hospitals can promote patients’ organic word of mouth through CSR initiatives and focusing on the reliability, safety and quality of care.
Originality/value
This study examines the mediation effects of trust and PHI and moderating role of hospital type in the relationships between two components of CSR effort and hospital brand advocacy.
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15
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Pham L, Williamson S, Mohebbi C, Nguyen B, Nguyen H. The Mediating Role of Perceived Value in the Effect of Multi-Dimensional Risk in Mobile Banking. International Journal of Enterprise Information Systems 2019. [DOI: 10.4018/ijeis.2019100101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This study examines which risk factors contribute most to perceived risk in Vietnam's mobile banking environment; explores the relationships among perceived risk, perceived value and intention to use mobile banking in Vietnam's mobile banking environment; and investigates any mediating role perceived value may have in the relationship between perceived risk and intention to use mobile banking in Vietnam's mobile banking environment. A convenience sample of 403 respondents who were customers of one of the largest joint stock commercial banks in Vietnam was used. The results of this study indicated that perceived risk is negatively related to intention to use mobile banking; that perceived value is positively associated with intention to use mobile banking; that perceived risk is negatively related to perceived value; and that perceived value plays a partial mediating role in the relationship between perceived risk and intention to use mobile banking.
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Affiliation(s)
- Long Pham
- School of Management, College of Business and Social Sciences, University of Louisiana at Monroe, Monroe, USA & Department of Economics and Management, Thuyloi University, Hanoi, Vietnam
| | - Stan Williamson
- School of Management, College of Business and Social Sciences, University of Louisiana at Monroe, Monroe, USA
| | - Cyrus Mohebbi
- School of Business, New York University, New York City, USA
| | - Binh Nguyen
- Military Commercial Joint Stock Bank, Hanoi, Viet Nam
| | - Hien Nguyen
- Vietnam - Japan Institute for Human Resources Development, Foreign Trade University, Hanoi, Vietnam
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16
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Morgan K, Boktor M, Ford C, Pham L, Morris JD, Jordan PA, Cvek U, Trutschl M, Alexander JS. Venous thromboembolism in IBD: Increased risk for women in CD? Pathophysiology 2019; 26:163-168. [PMID: 31014914 DOI: 10.1016/j.pathophys.2019.03.001] [Citation(s) in RCA: 2] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Accepted: 03/12/2019] [Indexed: 01/06/2023] Open
Abstract
Although coagulation disturbances have been described in inflammatory bowel disease (IBD), it remains unclear how common venous thromboembolism (VTE) is in IBD, and what factors influence VTE frequency. We evaluated VTE in Crohn's disease (CD) and ulcerative colitis (UC) at LSUHSC-S, a southern US medical center with an approximately equal White: African-American (AA) (1.12:1) patient base. This retrospective study evaluated VTE as a co-morbidity in IBD as a function of age, gender and race based on ICD-10 coding (2011-2015.) Results. Of 276 IBD diagnostic records, 213 were for CD (77.17%) and 63 for UC (22.8%). 52% of the CD patients were white, 42% were AA, and 6% were other. 42% of CD patients were male, with 58% were female. 6.1% (13 patients) of the 213 CD patients had a VTE. Of these 13 CD patients, 9 had active disease and 4 were in remission. 9 of 13 were female and 4 were male, with 5 white patients and 4 A A patients. 63 patients were diagnosed with UC, 3.38-fold fewer cases than CD. 25 UC patients were white, 25 were AA and 13 were in other ethnic groups. Of 63 UC cases, 2 UC patients had a VTE, both with active disease. At our institution, VTE appears to be 3x more frequently associated with CD than UC and was more common in white female patients. The recognition of VTE risk in CD, particularly in women, may be an important observation which may guide therapy and limit potentially life-threatening consequences.
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Affiliation(s)
- K Morgan
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, United States
| | - M Boktor
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, United States
| | - C Ford
- LSUHSC-S, Molecular and Cellular Physiology, United States
| | - L Pham
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, United States
| | - J D Morris
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, United States; LSUHSC-S, Molecular and Cellular Physiology, United States; LSU Shreveport, Department of Computer Science, United States
| | - P A Jordan
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, United States
| | - U Cvek
- LSU Shreveport, Department of Computer Science, United States
| | - M Trutschl
- LSU Shreveport, Department of Computer Science, United States
| | - J S Alexander
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, United States; LSUHSC-S, Molecular and Cellular Physiology, United States.
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17
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Pham L, Kim K, Walker B, DeNardin T, Le H. Development and Validation of an Instrument to Measure Student Perceived E-Learning Service Quality. International Journal of Enterprise Information Systems 2019. [DOI: 10.4018/ijeis.2019040102] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
While universities have been trying to focus their resources and attention on improving e-learning, many universities seem to be lagging behind students' increasing demands and expectations. In order to sustainably grow in an increasingly competitive e-learning environment, it is clear that universities must provide e-learning students with high quality services. To do this, universities are required to understand the attributes that e-learning students use to evaluate service quality. Unfortunately, little research on e-learning service quality has been conducted. This study developed and validated an instrument to measure student perceived e-learning service quality. Based on the relevant literature review and using responses from 1,232 e-learning students, the authors validated a three-factor e-learning service quality instrument involving e-learning system quality, e-learning instructor and course materials quality, and e-learning administrative and support service quality. Among these three factors, e-learning system quality makes the highest contribution to overall e-learning service quality, followed by e-learning instructor and course materials quality, and e-learning administrative and support service quality. This scale provides a useful measurement for researchers who wish to measure e-learning service quality and for university administrators and managers who want to enhance universities' e-learning servie quality.
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Affiliation(s)
- Long Pham
- School of Management, University of Louisiana at Monroe, Monroe, USA & Thuyloi University, Hanoi, Vietnam
| | - Kioh Kim
- University of Louisiana at Monroe, Monroe, USA
| | | | | | - Hanh Le
- University of Louisiana at Monroe, Monroe, USA
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18
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Littauer R, Sather J, Rothenberg C, Finn E, Yip M, Matouk C, Pham L, Sheth K, Ulrich A, Parwani Y, Venkatesh A. 57 Improving the Safety and Quality of Inter-Hospital Transfer for Nontraumatic Intracerebral and Subarachnoid Hemorrhage. Ann Emerg Med 2018. [DOI: 10.1016/j.annemergmed.2018.08.062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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19
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Pham L, Williamson S, Berry R. Student Perceptions of E-Learning Service Quality, E-Satisfaction, and E-Loyalty. International Journal of Enterprise Information Systems 2018. [DOI: 10.4018/ijeis.2018070102] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
With the growing ubiquity of the Internet and the continued evolution of the Internet of Things, universities are focusing more on web-based strategies to deliver higher education (i.e., e-learning). In spite of this, few studies on e-learning service quality have been conducted to examine the effectiveness of these efforts. This study seeks to identify primary e-learning service quality dimensions and to examine the relationships among e-learning service quality dimensions, overall e-learning service quality, e-learning satisfaction and e-learning loyalty as perceived by e-students in the college setting. Results identified five main factors that measure e-learning service quality: e-learning administrative and support service quality; e-learning instructor quality; e-learning accuracy; e-learning course materials quality; and e-learning security and privacy. The quality of e-learning administrative and support service, instructor performance, and course materials were positively related to overall e-learning service quality, with e-learning instructor quality the most influential. There was a positive association between overall e-learning service quality and e-learning loyalty, and between e-learning satisfaction and e-learning loyalty. Results are consistent with most studies of traditional and online services and other e-learning studies that customer loyalty is strongly influenced by customer satisfaction and quality of service and that customer satisfaction is strongly influenced by quality of service.
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Affiliation(s)
- Long Pham
- School of Management, College of Business and Social Sciences, University of Louisiana at Monroe, Monroe, LA, USA & Department of Economics and Management, Thuyloi University, Hanoi, Vietnam
| | - Stan Williamson
- School of Management, College of Business and Social Sciences, University of Louisiana at Monroe, Monroe, USA
| | - Ronald Berry
- College of Business and Social Sciences, University of Louisiana at Monroe, Monroe, USA
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20
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Fleury Curado TA, Otvos T, Klopfer T, Sennes L, Pham L, Polotsky VY, Schwartz AR. 0534 Balanced Co-activation of Protrudors and Rectractors is Required to Prevent Pharyngeal Obstruction During Sleep. Sleep 2018. [DOI: 10.1093/sleep/zsy061.533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- T A Fleury Curado
- The Johns Hopkins Asthma and Allergy Center, Baltimore, MD, United States, Baltimore, MD
| | - T Otvos
- The Johns Hopkins Asthma and Allergy Center, Baltimore, MD, United States, Baltimore, MD
| | - T Klopfer
- The Johns Hopkins Asthma and Allergy Center, Baltimore, MD, United States, Baltimore, MD
| | - L Sennes
- Otolaryngology Department, University of Sao Paulo, Sao Paulo, Brazil, Sao Paulo, BRAZIL
| | - L Pham
- The Johns Hopkins Asthma and Allergy Center, Baltimore, MD, United States, Baltimore, MD
| | - V Y Polotsky
- The Johns Hopkins Asthma and Allergy Center, Baltimore, MD, United States, Baltimore, MD
| | - A R Schwartz
- The Johns Hopkins Asthma and Allergy Center, Baltimore, MD, United States, Baltimore, MD
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21
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Goujon C, Gougeon M, Bouchaud O, Pham L, Mallard A, Lévy D, Simian P, Imbert P, Consigny P, Vray M. Chronovac voyageur : étude de l’immunité vis-à-vis de la fièvre jaune et de la rougeole chez des enfants vaccinés avant un départ en zone d’endémie amarile. Med Mal Infect 2017. [DOI: 10.1016/j.medmal.2017.03.321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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22
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Fleury Curado TA, Fishbein K, Pho H, Brennick M, Dergacheva O, Pham L, Ladenheim E, Spencer R, Sennes LU, Schwartz A, Polostky V. 0008 CHEMOGENETIC STIMULATION OF THE HYPOGLOSSAL NEURONS IMPROVES THE UPPER AIRWAY PATENCY. Sleep 2017. [DOI: 10.1093/sleepj/zsx050.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Yue F, Cheng Y, Breschi A, Vierstra J, Wu W, Ryba T, Sandstrom R, Ma Z, Davis C, Pope BD, Shen Y, Pervouchine DD, Djebali S, Thurman RE, Kaul R, Rynes E, Kirilusha A, Marinov GK, Williams BA, Trout D, Amrhein H, Fisher-Aylor K, Antoshechkin I, DeSalvo G, See LH, Fastuca M, Drenkow J, Zaleski C, Dobin A, Prieto P, Lagarde J, Bussotti G, Tanzer A, Denas O, Li K, Bender MA, Zhang M, Byron R, Groudine MT, McCleary D, Pham L, Ye Z, Kuan S, Edsall L, Wu YC, Rasmussen MD, Bansal MS, Kellis M, Keller CA, Morrissey CS, Mishra T, Jain D, Dogan N, Harris RS, Cayting P, Kawli T, Boyle AP, Euskirchen G, Kundaje A, Lin S, Lin Y, Jansen C, Malladi VS, Cline MS, Erickson DT, Kirkup VM, Learned K, Sloan CA, Rosenbloom KR, Lacerda de Sousa B, Beal K, Pignatelli M, Flicek P, Lian J, Kahveci T, Lee D, Kent WJ, Ramalho Santos M, Herrero J, Notredame C, Johnson A, Vong S, Lee K, Bates D, Neri F, Diegel M, Canfield T, Sabo PJ, Wilken MS, Reh TA, Giste E, Shafer A, Kutyavin T, Haugen E, Dunn D, Reynolds AP, Neph S, Humbert R, Hansen RS, De Bruijn M, Selleri L, Rudensky A, Josefowicz S, Samstein R, Eichler EE, Orkin SH, Levasseur D, Papayannopoulou T, Chang KH, Skoultchi A, Gosh S, Disteche C, Treuting P, Wang Y, Weiss MJ, Blobel GA, Cao X, Zhong S, Wang T, Good PJ, Lowdon RF, Adams LB, Zhou XQ, Pazin MJ, Feingold EA, Wold B, Taylor J, Mortazavi A, Weissman SM, Stamatoyannopoulos JA, Snyder MP, Guigo R, Gingeras TR, Gilbert DM, Hardison RC, Beer MA, Ren B. A comparative encyclopedia of DNA elements in the mouse genome. Nature 2015; 515:355-64. [PMID: 25409824 PMCID: PMC4266106 DOI: 10.1038/nature13992] [Citation(s) in RCA: 1135] [Impact Index Per Article: 126.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Accepted: 10/24/2014] [Indexed: 12/11/2022]
Abstract
The laboratory mouse shares the majority of its protein-coding genes with humans, making it the premier model organism in biomedical research, yet the two mammals differ in significant ways. To gain greater insights into both shared and species-specific transcriptional and cellular regulatory programs in the mouse, the Mouse ENCODE Consortium has mapped transcription, DNase I hypersensitivity, transcription factor binding, chromatin modifications and replication domains throughout the mouse genome in diverse cell and tissue types. By comparing with the human genome, we not only confirm substantial conservation in the newly annotated potential functional sequences, but also find a large degree of divergence of sequences involved in transcriptional regulation, chromatin state and higher order chromatin organization. Our results illuminate the wide range of evolutionary forces acting on genes and their regulatory regions, and provide a general resource for research into mammalian biology and mechanisms of human diseases.
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Affiliation(s)
- Feng Yue
- 1] Ludwig Institute for Cancer Research and University of California, San Diego School of Medicine, 9500 Gilman Drive, La Jolla, California 92093, USA. [2] Department of Biochemistry and Molecular Biology, College of Medicine, The Pennsylvania State University, Hershey, Pennsylvania 17033, USA
| | - Yong Cheng
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Alessandra Breschi
- Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and UPF, Doctor Aiguader, 88, 08003 Barcelona, Catalonia, Spain
| | - Jeff Vierstra
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Weisheng Wu
- Center for Comparative Genomics and Bioinformatics, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Tyrone Ryba
- Department of Biological Science, 319 Stadium Drive, Florida State University, Tallahassee, Florida 32306-4295, USA
| | - Richard Sandstrom
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Zhihai Ma
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Carrie Davis
- Functional Genomics, Cold Spring Harbor Laboratory, Bungtown Road, Cold Spring Harbor, New York 11724, USA
| | - Benjamin D Pope
- Department of Biological Science, 319 Stadium Drive, Florida State University, Tallahassee, Florida 32306-4295, USA
| | - Yin Shen
- Ludwig Institute for Cancer Research and University of California, San Diego School of Medicine, 9500 Gilman Drive, La Jolla, California 92093, USA
| | - Dmitri D Pervouchine
- Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and UPF, Doctor Aiguader, 88, 08003 Barcelona, Catalonia, Spain
| | - Sarah Djebali
- Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and UPF, Doctor Aiguader, 88, 08003 Barcelona, Catalonia, Spain
| | - Robert E Thurman
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Rajinder Kaul
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Eric Rynes
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Anthony Kirilusha
- Division of Biology, California Institute of Technology, Pasadena, California 91125, USA
| | - Georgi K Marinov
- Division of Biology, California Institute of Technology, Pasadena, California 91125, USA
| | - Brian A Williams
- Division of Biology, California Institute of Technology, Pasadena, California 91125, USA
| | - Diane Trout
- Division of Biology, California Institute of Technology, Pasadena, California 91125, USA
| | - Henry Amrhein
- Division of Biology, California Institute of Technology, Pasadena, California 91125, USA
| | - Katherine Fisher-Aylor
- Division of Biology, California Institute of Technology, Pasadena, California 91125, USA
| | - Igor Antoshechkin
- Division of Biology, California Institute of Technology, Pasadena, California 91125, USA
| | - Gilberto DeSalvo
- Division of Biology, California Institute of Technology, Pasadena, California 91125, USA
| | - Lei-Hoon See
- Functional Genomics, Cold Spring Harbor Laboratory, Bungtown Road, Cold Spring Harbor, New York 11724, USA
| | - Meagan Fastuca
- Functional Genomics, Cold Spring Harbor Laboratory, Bungtown Road, Cold Spring Harbor, New York 11724, USA
| | - Jorg Drenkow
- Functional Genomics, Cold Spring Harbor Laboratory, Bungtown Road, Cold Spring Harbor, New York 11724, USA
| | - Chris Zaleski
- Functional Genomics, Cold Spring Harbor Laboratory, Bungtown Road, Cold Spring Harbor, New York 11724, USA
| | - Alex Dobin
- Functional Genomics, Cold Spring Harbor Laboratory, Bungtown Road, Cold Spring Harbor, New York 11724, USA
| | - Pablo Prieto
- Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and UPF, Doctor Aiguader, 88, 08003 Barcelona, Catalonia, Spain
| | - Julien Lagarde
- Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and UPF, Doctor Aiguader, 88, 08003 Barcelona, Catalonia, Spain
| | - Giovanni Bussotti
- Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and UPF, Doctor Aiguader, 88, 08003 Barcelona, Catalonia, Spain
| | - Andrea Tanzer
- 1] Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and UPF, Doctor Aiguader, 88, 08003 Barcelona, Catalonia, Spain. [2] Department of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Waehringerstrasse 17/3/303, A-1090 Vienna, Austria
| | - Olgert Denas
- Departments of Biology and Mathematics and Computer Science, Emory University, O. Wayne Rollins Research Center, 1510 Clifton Road NE, Atlanta, Georgia 30322, USA
| | - Kanwei Li
- Departments of Biology and Mathematics and Computer Science, Emory University, O. Wayne Rollins Research Center, 1510 Clifton Road NE, Atlanta, Georgia 30322, USA
| | - M A Bender
- 1] Department of Pediatrics, University of Washington, Seattle, Washington 98195, USA. [2] Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA
| | - Miaohua Zhang
- Basic Science Division, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA
| | - Rachel Byron
- Basic Science Division, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA
| | - Mark T Groudine
- 1] Basic Science Division, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA. [2] Department of Radiation Oncology, University of Washington, Seattle, Washington 98195, USA
| | - David McCleary
- Ludwig Institute for Cancer Research and University of California, San Diego School of Medicine, 9500 Gilman Drive, La Jolla, California 92093, USA
| | - Long Pham
- Ludwig Institute for Cancer Research and University of California, San Diego School of Medicine, 9500 Gilman Drive, La Jolla, California 92093, USA
| | - Zhen Ye
- Ludwig Institute for Cancer Research and University of California, San Diego School of Medicine, 9500 Gilman Drive, La Jolla, California 92093, USA
| | - Samantha Kuan
- Ludwig Institute for Cancer Research and University of California, San Diego School of Medicine, 9500 Gilman Drive, La Jolla, California 92093, USA
| | - Lee Edsall
- Ludwig Institute for Cancer Research and University of California, San Diego School of Medicine, 9500 Gilman Drive, La Jolla, California 92093, USA
| | - Yi-Chieh Wu
- Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, USA
| | - Matthew D Rasmussen
- Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, USA
| | - Mukul S Bansal
- Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, USA
| | - Manolis Kellis
- 1] Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, USA. [2] Broad Institute of MIT and Harvard, Cambridge, Massachusetts 02142, USA
| | - Cheryl A Keller
- Center for Comparative Genomics and Bioinformatics, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Christapher S Morrissey
- Center for Comparative Genomics and Bioinformatics, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Tejaswini Mishra
- Center for Comparative Genomics and Bioinformatics, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Deepti Jain
- Center for Comparative Genomics and Bioinformatics, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Nergiz Dogan
- Center for Comparative Genomics and Bioinformatics, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Robert S Harris
- Center for Comparative Genomics and Bioinformatics, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Philip Cayting
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Trupti Kawli
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Alan P Boyle
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Ghia Euskirchen
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Anshul Kundaje
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Shin Lin
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Yiing Lin
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Camden Jansen
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California 92697, USA
| | - Venkat S Malladi
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Melissa S Cline
- Center for Biomolecular Science and Engineering, School of Engineering, University of California Santa Cruz (UCSC), Santa Cruz, California 95064, USA
| | - Drew T Erickson
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Vanessa M Kirkup
- Center for Biomolecular Science and Engineering, School of Engineering, University of California Santa Cruz (UCSC), Santa Cruz, California 95064, USA
| | - Katrina Learned
- Center for Biomolecular Science and Engineering, School of Engineering, University of California Santa Cruz (UCSC), Santa Cruz, California 95064, USA
| | - Cricket A Sloan
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Kate R Rosenbloom
- Center for Biomolecular Science and Engineering, School of Engineering, University of California Santa Cruz (UCSC), Santa Cruz, California 95064, USA
| | - Beatriz Lacerda de Sousa
- Departments of Obstetrics/Gynecology and Pathology, and Center for Reproductive Sciences, University of California San Francisco, San Francisco, California 94143, USA
| | - Kathryn Beal
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Miguel Pignatelli
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Paul Flicek
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK
| | - Jin Lian
- Yale University, Department of Genetics, PO Box 208005, 333 Cedar Street, New Haven, Connecticut 06520-8005, USA
| | - Tamer Kahveci
- Computer &Information Sciences &Engineering, University of Florida, Gainesville, Florida 32611, USA
| | - Dongwon Lee
- McKusick-Nathans Institute of Genetic Medicine and Department of Biomedical Engineering, Johns Hopkins University, 733 N. Broadway, BRB 573 Baltimore, Maryland 21205, USA
| | - W James Kent
- Center for Biomolecular Science and Engineering, School of Engineering, University of California Santa Cruz (UCSC), Santa Cruz, California 95064, USA
| | - Miguel Ramalho Santos
- Departments of Obstetrics/Gynecology and Pathology, and Center for Reproductive Sciences, University of California San Francisco, San Francisco, California 94143, USA
| | - Javier Herrero
- 1] European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK. [2] Bill Lyons Informatics Centre, UCL Cancer Institute, University College London, London WC1E 6DD, UK
| | - Cedric Notredame
- Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and UPF, Doctor Aiguader, 88, 08003 Barcelona, Catalonia, Spain
| | - Audra Johnson
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Shinny Vong
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Kristen Lee
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Daniel Bates
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Fidencio Neri
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Morgan Diegel
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Theresa Canfield
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Peter J Sabo
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Matthew S Wilken
- Department of Biological Structure, University of Washington, HSB I-516, 1959 NE Pacific Street, Seattle, Washington 98195, USA
| | - Thomas A Reh
- Department of Biological Structure, University of Washington, HSB I-516, 1959 NE Pacific Street, Seattle, Washington 98195, USA
| | - Erika Giste
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Anthony Shafer
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Tanya Kutyavin
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Eric Haugen
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Douglas Dunn
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Alex P Reynolds
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Shane Neph
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Richard Humbert
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - R Scott Hansen
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Marella De Bruijn
- MRC Molecular Haemotology Unit, University of Oxford, Oxford OX3 9DS, UK
| | - Licia Selleri
- Department of Cell and Developmental Biology, Weill Cornell Medical College, New York, New York 10065, USA
| | - Alexander Rudensky
- HHMI and Ludwig Center at Memorial Sloan Kettering Cancer Center, Immunology Program, Memorial Sloan Kettering Cancer Canter, New York, New York 10065, USA
| | - Steven Josefowicz
- HHMI and Ludwig Center at Memorial Sloan Kettering Cancer Center, Immunology Program, Memorial Sloan Kettering Cancer Canter, New York, New York 10065, USA
| | - Robert Samstein
- HHMI and Ludwig Center at Memorial Sloan Kettering Cancer Center, Immunology Program, Memorial Sloan Kettering Cancer Canter, New York, New York 10065, USA
| | - Evan E Eichler
- Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA
| | - Stuart H Orkin
- Dana Farber Cancer Institute, Harvard Medical School, Cambridge, Massachusetts 02138, USA
| | - Dana Levasseur
- University of Iowa Carver College of Medicine, Department of Internal Medicine, Iowa City, Iowa 52242, USA
| | - Thalia Papayannopoulou
- Division of Hematology, Department of Medicine, University of Washington, Seattle, Washington 98195, USA
| | - Kai-Hsin Chang
- University of Iowa Carver College of Medicine, Department of Internal Medicine, Iowa City, Iowa 52242, USA
| | - Arthur Skoultchi
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Srikanta Gosh
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA
| | - Christine Disteche
- Department of Pathology, University of Washington, Seattle, Washington 98195, USA
| | - Piper Treuting
- Department of Comparative Medicine, University of Washington, Seattle, Washington 98195, USA
| | - Yanli Wang
- Bioinformatics and Genomics program, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Mitchell J Weiss
- Department of Hematology, St Jude Children's Research Hospital, Memphis, Tennessee 38105, USA
| | - Gerd A Blobel
- 1] Division of Hematology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA. [2] Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Xiaoyi Cao
- Department of Bioengineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA
| | - Sheng Zhong
- Department of Bioengineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA
| | - Ting Wang
- Department of Genetics, Center for Genome Sciences and Systems Biology, Washington University School of Medicine, St. Louis, Missouri 63108, USA
| | - Peter J Good
- NHGRI, National Institutes of Health, 5635 Fishers Lane, Bethesda, Maryland 20892-9307, USA
| | - Rebecca F Lowdon
- NHGRI, National Institutes of Health, 5635 Fishers Lane, Bethesda, Maryland 20892-9307, USA
| | - Leslie B Adams
- NHGRI, National Institutes of Health, 5635 Fishers Lane, Bethesda, Maryland 20892-9307, USA
| | - Xiao-Qiao Zhou
- NHGRI, National Institutes of Health, 5635 Fishers Lane, Bethesda, Maryland 20892-9307, USA
| | - Michael J Pazin
- NHGRI, National Institutes of Health, 5635 Fishers Lane, Bethesda, Maryland 20892-9307, USA
| | - Elise A Feingold
- NHGRI, National Institutes of Health, 5635 Fishers Lane, Bethesda, Maryland 20892-9307, USA
| | - Barbara Wold
- Division of Biology, California Institute of Technology, Pasadena, California 91125, USA
| | - James Taylor
- Departments of Biology and Mathematics and Computer Science, Emory University, O. Wayne Rollins Research Center, 1510 Clifton Road NE, Atlanta, Georgia 30322, USA
| | - Ali Mortazavi
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California 92697, USA
| | - Sherman M Weissman
- Yale University, Department of Genetics, PO Box 208005, 333 Cedar Street, New Haven, Connecticut 06520-8005, USA
| | | | - Michael P Snyder
- Department of Genetics, Stanford University, 300 Pasteur Drive, MC-5477 Stanford, California 94305, USA
| | - Roderic Guigo
- Bioinformatics and Genomics, Centre for Genomic Regulation (CRG) and UPF, Doctor Aiguader, 88, 08003 Barcelona, Catalonia, Spain
| | - Thomas R Gingeras
- Functional Genomics, Cold Spring Harbor Laboratory, Bungtown Road, Cold Spring Harbor, New York 11724, USA
| | - David M Gilbert
- Department of Biological Science, 319 Stadium Drive, Florida State University, Tallahassee, Florida 32306-4295, USA
| | - Ross C Hardison
- Center for Comparative Genomics and Bioinformatics, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Michael A Beer
- McKusick-Nathans Institute of Genetic Medicine and Department of Biomedical Engineering, Johns Hopkins University, 733 N. Broadway, BRB 573 Baltimore, Maryland 21205, USA
| | - Bing Ren
- Ludwig Institute for Cancer Research and University of California, San Diego School of Medicine, 9500 Gilman Drive, La Jolla, California 92093, USA
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Pham L, Liang Y, Guo S, Murphy S, Sheng Z. DD-07 * A KINOME RNA INTERFERENCE SCREEN IDENTIFIES NOVEL THERAPEUTIC TARGETS FOR GLIOBLASTOMA. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou246.7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Abstract
E-banking is seen as the newest delivery channel for banking services in many developed countries and is believed to have a significant impact on the bank market. It is contended that e-banking is providing numerous opportunities for banks and non-bank financial institutions to add a low cost distribution channel to their existent distribution channels in order to better serve their customers by offering high quality products and services. Little research on factors influencing the intention to use e-banking has been implemented in newly emerging countries such as Vietnam. Thus, this study has, based on an extensive literature review on e-banking benefits for both banks and their customers and relevant theories on innovation adoption, proposed a comprehensive model of e-banking intention to use by customers in Vietnam. Based on the structural equation modeling technique, both linear and non-linear effects were tested. The results show that subjective norms, perceived ease of use, trust, and perceived benefit were statistically significant in directly influencing intention to use e-banking. In addition, subjective norms, perceived ease of use, and trust were statistically significant in indirectly influencing intention to use e-banking via perceived benefit. Practical implications and future studies were also discussed.
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Affiliation(s)
- Long Pham
- Department of Business Administration, Minot State University, Minot, ND, USA & School of Banking and Finance, National Economics University, Hanoi, Vietnam
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Pham L, Cao NY, Nguyen TD, Tran PT. Structural Models for E-Banking Adoption in Vietnam. International Journal of Enterprise Information Systems 2013. [DOI: 10.4018/jeis.2013010102] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
E-banking is seen as the newest delivery channel for banking services in many developed countries and is believed to have a significant impact on the bank market. E-banking is providing numerous opportunities for banks and non-bank financial institutions to add a low cost distribution channel to their existent distribution channels. Little research on factors influencing the adoption of e-banking has been implemented in countries with very high economic growth rates (such as Vietnam) that are emerging as new potential markets. Thus, this study has, based on an extensive literature review on e-banking benefits for both banks and their customers and relevant theories on innovation adoption, proposed alternative models (including both moderator and mediating effects) of e-banking intention to use by customers in Vietnam. Furthermore, a set of model hypotheses presenting relationships among factors influencing e-banking intention to use have been set up. Practical implications and future studies were also discussed.
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Affiliation(s)
- Long Pham
- Long Pham, Department of Business Administration, College of Business, Minot State University, Minot, ND, USA; and School of Banking and Finance, National Economics University, Hanoi, Vietnam
| | - Nhi Y. Cao
- Department of Financial and Monetary Theory, School of Banking and Finance, National Economics University, Hanoi, Vietnam
| | - Thanh D. Nguyen
- Department of Management Information System, Ho Chi Minh City University of Technology, Ho Chi Minh, Vietnam
| | - Phong T. Tran
- Department of Commercial Bank, School of Banking and Finance, National Economics University, Hanoi, Vietnam
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Pham L, Teich JE. A Success Model for Enterprise Resource Planning Adoption to Improve Financial Performance in Vietnam’s Equitized State Owned Enterprises. International Journal of Enterprise Information Systems 2011. [DOI: 10.4018/jeis.2011010103] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Equitized state-owned enterprises (ESOEs) in Vietnam have begun to implement enterprise resource planning (ERP) systems, ubiquitous in developed countries, to improve their operational and financial performance. However, such ESOEs lack a model for ERP adoption to guide them in successfully implementing ERP systems. This study is based on an extensive review of literature on ERP benefits and the equitization process in Vietnam and relevant theories on innovation adoption, and the authors propose a success model for ERP adoption in Vietnam’s ESOEs. Model hypotheses that present relationships among factors influencing ERP adoption are given and future studies are discussed.
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Watanabe K, Iizuka T, Adeleke A, Pham L, Shlimon AE, Yasin M, Horvath P, Unterman TG. Involvement of toll-like receptor 4 in alveolar bone loss and glucose homeostasis in experimental periodontitis. J Periodontal Res 2010; 46:21-30. [PMID: 20860587 DOI: 10.1111/j.1600-0765.2010.01304.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
BACKGROUND AND OBJECTIVE There is general agreement that certain fatty acids and lipopolysaccharides (LPS) promote inflammation through toll-like receptor 4 (TLR4), and that inflammation promotes insulin resistance. We therefore hypothesized that mice with periodontitis and a TLR4 loss-of-function (LOF) mutation fed a high-fat (HF) diet would develop improved glucose homeostasis compared with wild-type (WT) animals with periodontitis fed a HF diet. MATERIAL AND METHODS Wild-type and TLR4 mutant mice fed a HF diet were divided into four groups (n = 6/group): WT; WT with periodontitis (WT/P); mutant (Mut); and mutant with periodontitis (Mut/P). Periodontitis was induced by placing LPS soaked ligatures around maxillary second molars. Fasting insulin and glucose levels were measured weekly for 10 wk. Glucose tolerance was evaluated at baseline (week 1) and at 9 wk. Insulin signaling (phosphorylation of Akt) and tumor necrosis factor-α (TNF-α) mRNA levels in liver were determined when the mice were killed at week 10. RESULTS Mut/P mice developed less alveolar bone loss compared with WT/P mice (p < 0.05). Fasting glucose levels were improved after 8 wk of feeding a HF diet (weeks 9 and 10) in Mut/P mice compared with Mut, WT and WT/P mice (p < 0.05). Glucose tolerance was impaired in all groups compared with baseline (p < 0.05), except for the Mut/P group. Insulin signaling was improved (p < 0.05), and expression of TNF-α was decreased (p < 0.05) in the liver of Mut/P mice compared with the liver of WT/P mice. CONCLUSION The TLR4 LOF mutation partially protects against alveolar bone loss and improves glucose homeostasis in mice with periodontitis fed a HF diet.
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Affiliation(s)
- K Watanabe
- Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, IL 60612-7212, USA.
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Tai KK, Pham L, Truong DD. Intracisternal administration of glibenclamide or 5-hydroxydecanoate does not reverse the neuroprotective effect of ketogenic diet against ischemic brain injury-induced neurodegeneration. Brain Inj 2010; 23:1081-8. [PMID: 19909054 DOI: 10.3109/02699050903421123] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PRIMARY OBJECTIVE To investigate the role of ATP-sensitive potassium (K(ATP)) channels in the neuroprotective effects of a ketogenic diet against cardiac arrest-induced cerebral ischemic brain injury-induced neurodegeneration. RESEARCH DESIGN Male Sprague Dawley rats were randomly divided into three groups and were fed with a ketogenic diet for 25 days before being subjected to a cardiac arrest-induced cerebral ischemia for 8 minutes 30 seconds. Four hours before cardiac arrest-induced cerebral ischemia, one group was intracisternally injected with glibenclamide, a plasma membrane K(ATP) channel blocker. The second group was injected with 5-hydroxydecanoate, a mitochondrial K(ATP) channel blocker. The third group was without the pre-treatment with K(ATP) channel antagonist. Nine days after the cardiac arrest, rats were sacrificed. Fluoro-jade (FJ) staining was used to evaluate cerebral ischemic neurodegeneration in the rat brain sections. MAIN OUTCOMES AND RESULTS The number of FJ-positive degenerating neurons in the CA1 area of the hippocampus, the cerebellum and the thalamic reticular nucleus of the ketogenic diet-fed rats with or without glibenclamide or 5-hydroxydecanoate pre-treatment before cardiac arrest-induced cerebral ischemia is zero. CONCLUSIONS The results suggest that K(ATP) channels do not play a significant role in the neuroprotective effects of the ketogenic diet against cardiac arrest-induced cerebral ischemic injury-induced neurodegeneration.
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Affiliation(s)
- K-K Tai
- Long Beach Memorial Medical Center, Long Beach, CA 90806, USA.
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Morse L, Teng YD, Pham L, Newton K, Yu D, Liao WL, Kohler T, Müller R, Graves D, Stashenko P, Battaglino R. Spinal cord injury causes rapid osteoclastic resorption and growth plate abnormalities in growing rats (SCI-induced bone loss in growing rats). Osteoporos Int 2008; 19:645-52. [PMID: 17987335 PMCID: PMC4370281 DOI: 10.1007/s00198-007-0494-x] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [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: 07/15/2007] [Accepted: 09/21/2007] [Indexed: 01/08/2023]
Abstract
UNLABELLED Spinal cord injury causes severe bone loss. We report osteoclast resorption with severe trabecular and cortical bone loss, decreased bone mineral apposition, and growth plate abnormalities in a rodent model of contusion spinal cord injury. These findings will help elucidate the mechanisms of osteoporosis following neurological trauma. INTRODUCTION Limited understanding of the mechanism(s) that underlie spinal cord injury (SCI)-induced bone loss has led to few treatment options. As SCI-induced osteoporosis carries significant morbidity and can worsen already profound disability, there is an urgency to advance knowledge regarding this pathophysiology. METHODS A clinically relevant contusion model of experimental spinal cord injury was used to generate severe lower thoracic SCI by weight-drop (10 g x 50 mm) in adolescent male Sprague-Dawley rats. Body weight and gender-matched naïve (no surgery) rats served as controls. Bone microarchitecture was determined by micro-computed tomographic imaging. Mature osteoclasts were identified by TRAP staining and bone apposition rate was determined by dynamic histomorphometry. RESULTS At 10 days post-injury we detected a marked 48% decrease in trabecular bone and a 35% decrease in cortical bone at the distal femoral metaphysis by micro-CT. A 330% increase in the number of mature osteoclasts was detected at the growth plate in the injured animals that corresponded with cellular disorganization at the chondro-osseous junction. Appositional growth studies demonstrated decreased new bone formation with a mineralization defect indicative of osteoblast dysfunction. CONCLUSIONS Contusion SCI results in a rapid bone loss that is the result of increased bone resorption and decreased bone formation.
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Affiliation(s)
- L Morse
- Department of Physical Medicine and Rehabilitation, Harvard Medical School and Spaulding Rehabilitation Hospital, Boston, MA 02115, USA.
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Kim H, Baik JH, Pham L, Jacobs M. Abstract No. 140: Predictive Factors for Successful MR-Guided Focused Ultrasound Surgery in the Treatment of Uterine Leiomyomata. J Vasc Interv Radiol 2008. [DOI: 10.1016/j.jvir.2007.12.156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Kim H, Baik JH, Pham L, Jacobs M. Abstract No. 141: MR-Guided Focused Ultrasound Surgery for Symptomatic Uterine Leiomyomata: Long-Term Clinical Results. J Vasc Interv Radiol 2008. [DOI: 10.1016/j.jvir.2007.12.157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Battaglino RA, Pham L, Morse LR, Vokes M, Sharma A, Odgren PR, Yang M, Sasaki H, Stashenko P. NHA-oc/NHA2: a mitochondrial cation-proton antiporter selectively expressed in osteoclasts. Bone 2008; 42:180-92. [PMID: 17988971 PMCID: PMC3593247 DOI: 10.1016/j.bone.2007.09.046] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [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: 05/23/2007] [Revised: 08/27/2007] [Accepted: 09/07/2007] [Indexed: 11/23/2022]
Abstract
Bone resorption is regulated by a complex system of hormones and cytokines that cause osteoblasts/stromal cells and lymphocytes to produce factors including RANKL, that ultimately result in the differentiation and activation of osteoclasts, the bone resorbing cells. We used a microarray approach to identify genes upregulated in RANKL-stimulated osteoclast precursor cells. Osteoclast expression was confirmed by multiple tissue Northern and in situ hybridization analysis. Gene function studies were carried out by siRNA analysis. We identified a novel gene, which we termed nha-oc/NHA2, which is strongly upregulated during RANKL-induced osteoclast differentiation in vitro and in vivo. nha-oc/NHA2 encodes a novel cation-proton antiporter (CPA) and is the mouse orthologue of a human gene identified in a database search: HsNHA2. nha-oc/NHA2 is selectively expressed in osteoclasts. NHA-oc/NHA2 protein localizes to the mitochondria, where it mediates Na(+)-dependent changes in mitochondrial pH and Na(+) acetate induced mitochondrial passive swelling. RNA silencing of nha-oc/nha2 reduces osteoclast differentiation and resorption, suggesting a role for NHA-oc/NHA2 in these processes. nha-oc/NHA2 therefore is a novel member of the CPA family and is the first mitochondrial NHA characterized to date. nha-oc/NHA2 is also unique in that it is the first eukaryotic and tissue-specific CPA2 characterized to date. NHA-oc/NHA2 displays the expected activities of a bona fide CPA and plays a key role(s) in normal osteoclast differentiation and function.
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Affiliation(s)
- R A Battaglino
- Department of Cytokine Biology, Forsyth Institute, 140 The Fenway, Boston, MA 02115, USA.
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Abstract
BACKGROUND AND OBJECTIVE Prostanoids that activate protein kinase C signaling are potent anabolic stimulators of cementoblastic OCCM cells. Using cDNA subtractive hybridization, we identified early growth response gene-1 (egr1) as a prostanoid-induced gene. Egr1, a zinc-finger transcription factor expressed during tooth development, regulates cell growth and differentiation. We hypothesize that Egr1 may mediate part of the prostanoid-induced anabolic effect in cementoblasts. Our objective was to characterize prostanoid-induced egr1 gene expression in OCCM cells. MATERIAL AND METHODS Total RNA and proteins were assayed by northern blot and western immunoblot assays. RESULTS Prostaglandin E2-, prostaglandin F2alpha- and fluprostenol-induced egr1 mRNA levels peaked at 0.5 h and returned to baseline by 4 h. Prostaglandin F2alpha and fluprostenol more potently induced egr1 compared with prostaglandin E2. The phorbol ester, phorbol 12-myristate 13-acetate, which activates protein kinase C signaling, induced egr1 mRNA levels 66-fold over the control, whereas forskolin (a cAMP-protein kinase A activator) and ionomycin (a calcium activator) had no effect. Protein kinase C inhibition significantly inhibited prostaglandin E2-, prostaglandin F2alpha- and fluprostenol-induced egr1 mRNA levels. Finally, prostanoids maximally induced Egr1 protein at 1 h. CONCLUSION egr1 is a primary response gene induced by prostaglandin E2, prostaglandin F2alpha and fluprostenol in OCCM cells through protein kinase C signaling, suggesting that Egr1 may be a key mediator of anabolic responses in cementoblasts. Cementum is vital for periodontal organ maintenance and regeneration. Periodontal ligament fibers (Sharpey's fibers) insert into bone and cementum, thereby supporting the tooth in the alveolus (1). If the periodontal organ is lost, its regeneration requires cementoblast differentiation in order to form new cementum for periodontal ligament fiber insertion. Early attempts to regenerate cementum have proven difficult and rarely generate sufficient tissue (2). A better understanding of the molecular and cellular regulators that promote cementoblast differentiation is critical for developing targeted periodontal regeneration.
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Affiliation(s)
- L Pham
- Section of Oral Biology, Division of Oral Biology and Medicine, School of Dentistry, University of California, Los Angeles, CA 90095-1668, USA
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Pham L, Purcell P, Morse L, Stashenko P, Battaglino R. Expression analysis of nha-oc/NHA2: a novel gene selectively expressed in osteoclasts. Gene Expr Patterns 2007; 7:846-51. [PMID: 17698421 PMCID: PMC2271150 DOI: 10.1016/j.modgep.2007.07.002] [Citation(s) in RCA: 17] [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] [Subscribe] [Scholar Register] [Received: 05/21/2007] [Revised: 07/01/2007] [Accepted: 07/02/2007] [Indexed: 11/29/2022]
Abstract
Bone resorption by osteoclasts is required for normal bone remodeling and reshaping of growing bones. Excessive resorption is an important pathologic feature of many diseases, including osteoporosis, arthritis, and periodontitis [Abu-Amer, Y. (2005). Advances in osteoclast differentiation and function. Curr. Drug Targets. Immune. Endocr. Metabol. Disord. 5, 347-355]. On the other hand, deficient resorption leads to osteopetrosis which is characterized by increased bone mass and may lead to bone deformities or in severe cases to death [Blair, H.C., Athanasou, N.A. 2004. Recent advances in osteoclast biology and pathological bone ddresorption. Histol. Histopathol. 19, 189-199; Del Fattore, A., Peruzzi, B., Rucci, N., Recchia, I., Cappariello, A., Longo, M., Fortunati, D., Ballanti, P., Iacobini, M., Luciani, M., Devito, R., Pinto, R., Caniglia, M., Lanino, E., Messina, C., Cesaro, S., Letizia, C., Bianchini, G., Fryssira, H., Grabowski, P., Shaw, N., Bishop, N., Hughes, D., Kapur, R.P., Datta, H.K., Taranta, A., Fornari, R., Migliaccio, S., and Teti, A. 2006. Clinical, genetic, and cellular analysis of 49 osteopetrotic patients: implications for diagnosis and treatment. J. Med. Genet. 43, 315--325]. Recently, we identified a gene, nha-oc/NHA2, which is strongly up regulated during RANKL-induced osteoclast differentiation in vitro and in vivo. nha-oc/NHA2 encodes a novel cation/proton exchanger that is strongly expressed in osteoclasts. The purpose of this work was to further validate the restricted expression of nha-oc/NHA2 in osteoclasts by in situ hybridization. Our results showed that nha-oc is expressed predominantly in bone. In the head, expression was found in the supraoccipitale bone, calvarium, mandible, and maxilla. Furthermore, nha-oc positive cells co-express the osteoclast markers TRAP and cathepsin k, confirming nha-oc/NHA2 osteoclast localization. However, only a subset of cathepsin k-expressing cells is positive for nha-oc/NHA2, suggesting that nha-oc is expressed by terminally differentiated osteoclasts.
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Affiliation(s)
- L. Pham
- Department of Cytokine Biology, Forsyth Institute, Boston, MA, USA
| | - P. Purcell
- Department of Genetics, Harvard Medical School, Boston, MA, USA
| | - L. Morse
- Department of Physical Medicine and Rehabilitation, Harvard Medical School and Spaulding Rehabilitation Hospital, Boston, MA, USA
| | - P. Stashenko
- Department of Cytokine Biology, Forsyth Institute, Boston, MA, USA
| | - R.A. Battaglino
- Department of Cytokine Biology, Forsyth Institute, Boston, MA, USA
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Abstract
The 14-3-3sigma, upregulated by p53 in response to DNA damage, can have a positive-feedback impact driving p53 activities and is a human cancer epithelial marker downregulated in various tumors. However, the precise roles of 14-3-3sigma during tumorigenesis are not well characterized. Here, we show that 14-3-3sigma is a critical regulator of murine double minute oncogene (MDM2). 14-3-3sigma interacts with MDM2 at the RING domain. The C-terminal region of 14-3-3sigma binds to MDM2 very efficiently. Importantly, 14-3-3sigma overexpression leads to destabilization of MDM2 through enhancing MDM2 self-ubiquitination and accelerating turnover rate. Conversely, loss of 14-3-3sigma results in a significant increase in MDM2 protein. Moreover, live-cell images indicated that 14-3-3sigma can affect the location of MDM2 from the nucleus to the cytoplasm, and that MDM2-mediated cytoplasmic localization of p53 can be reversed by the presence of 14-3-3sigma. Significantly, we further showed that 14-3-3sigma causes MDM2 downregulation, thereby stabilizing p53 and inhibiting tumor growth in animal tumors. Also, 14-3-3sigma blocks MDM2-mediated retinoblastoma degradation and p53 NEDDylation. Our results provide evidence that 14-3-3sigma is a pivotal MDM2 regulator involved in blocking a variety of activities of MDM2.
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Affiliation(s)
- H-Y Yang
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
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Lashley JC, Lawson AC, Cooley JC, Mihaila B, Opeil CP, Pham L, Hults WL, Smith JL, Schmiedeshoff GM, Drymiotis FR, Chapline G, Basu S, Riseborough PS. Tricritical phenomena at the gamma-->alpha transition in Ce0.9-xLaxTh0.1 alloys. Phys Rev Lett 2006; 97:235701. [PMID: 17280213 DOI: 10.1103/physrevlett.97.235701] [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: 03/17/2006] [Indexed: 05/13/2023]
Abstract
The gamma-->alpha isostructural transition in the Ce0.9-xLaxTh0.1 system is measured as a function of La alloying using specific heat, magnetic susceptibility, resistivity, thermal expansivity or striction measurements. A line of discontinuous transitions, as indicated by the change in volume, decreases exponentially from 118 K to close to 0 K with increasing La doping, and the transition changes from being first-order to continuous at a critical concentration, x(c) approximately 0.14. At the tricritical point, the coefficient of the linear T term in the specific heat gamma and the magnetic susceptibility increase rapidly near x(c) and approach large values at x=0.35 signifying that a heavy Fermi-liquid state evolves at large doping. The Wilson ratio reaches a value above 2 for a narrow range of concentrations near x(c), where the specific heat and susceptibility vary most rapidly with the doping concentration.
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Affiliation(s)
- J C Lashley
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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Williams WM, Pham L, MaQuilon S, Moldovan M, Fisk Z, Young DP, Chan JY. Crystal growth, structure, magnetic, and transport properties of TbRhIn5. Inorg Chem 2006; 45:4637-41. [PMID: 16749826 DOI: 10.1021/ic060185w] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Single crystals of TbRhIn5 were synthesized using the flux growth method. TbRhIn5 adopts the HoCoGa5 structure type and crystallizes in the space group P4/mmm, Z = 1. Lattice parameters are a = 4.6000(6) A, c = 7.4370(11) A, and V = 157.29(6) A3. Transport measurements show that TbRhIn5 is metallic (drho/dT > 0). A sharp antiferromagnetic transition is observed at T(N) = 48 K in the susceptibility data for TbRhIn5, which is highly anisotropic when the field is oriented along the c axis and a-b plane of the crystal and has an average effective moment of 9.72 muB/Tb3+.
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Affiliation(s)
- Willa M Williams
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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Lewis-Boyer L, Hill K, Walker J, Lewis C, Winkelstein M, Pham L, Butz A. Environmental Exposures In Rural Homes: Parent Report vs. Allergen Dust Samples. J Allergy Clin Immunol 2006. [DOI: 10.1016/j.jaci.2005.12.553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Pham L, Woelk GB, Ning Y, Madzime S, Mudzamiri S, Mahomed K, Williams MA. Seroprevalence and risk factors of syphilis infection in pregnant women delivering at Harare Maternity Hospital, Zimbabwe. Cent Afr J Med 2005; 51:24-30. [PMID: 17892228] [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] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
OBJECTIVE To evaluate risk factors and outcomes of syphilis during pregnancy. DESIGN Hospital based, cross sectional study. SETTING Harare Maternity Hospital, Harare, Zimbabwe. SUBJECTS A random sample of 2 969 pregnant women. MAIN OUTCOME MEASURES Syphilis seroprevalence. RESULTS Of the 2 969 women who provided blood samples, 4.8% were RPR positive. Approximately 2.2% of study subjects were RPR positive and TPHA negative. Notably, 2.5% of the population was RPR and TPHA positive at the time of giving birth. Older women had a higher risk of having positive syphilis status (p = 0.057). Increases in parity and gravidity were significantly associated with increased risk of syphilis infection. Prior stillbirths were associated with an increased risk of syphilis infection (odds ratio [OR], 3.4; 95% CI, 1.61 to 7.37; p = 0.001). Syphilis positive mothers were significantly more likely to give birth to syphilis positive newborns (p < 0.0001). CONCLUSIONS Our results suggest that there should be more effective antenatal screening and treatment of syphilis in Harare. Syphilis affects many sub-Saharan countries where effective educational outreach, screening, and treatment should take place to prevent the transmission of this venereal disease, especially among reproductive age and pregnant women.
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Affiliation(s)
- L Pham
- Department of Epidemiology ,University of Washington School of Public Health and Community Medicine, Seattle, USA
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Tsingotjidou A, Nervina JM, Pham L, Bezouglaia O, Tetradis S. Parathyroid hormone induces RGS-2 expression by a cyclic adenosine 3',5'-monophosphate-mediated pathway in primary neonatal murine osteoblasts. Bone 2002; 30:677-84. [PMID: 11996904 DOI: 10.1016/s8756-3282(02)00698-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [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: 11/30/2022]
Abstract
Parathyroid hormone (PTH) is a promising anabolic agent for the treatment of osteoporosis. However, PTH is also potently catabolic. To help delineate the molecular mediators of PTH's opposing effects on skeletal metabolism, we have examined PTH-induced regulator of G-protein signaling-2 (RGS-2) expression and function in murine osteoblasts. RGS proteins are GTPase-activating proteins (GAPs) that regulate GTP-binding protein-coupled receptor (GPCR) signaling by enhancing the intrinsic GTPase activity of Galpha subunits. We found that 10 nmol/L PTH maximally induced RGS-2 mRNA in murine MC3T3-E1 cells, rat Py1a and ROS-17/2.8 cells, primary mouse osteoblasts (MOB cells), and mouse calvariae organ culture at 1-2 h posttreatment. PTH signaling through its receptor, PTHR1, is coupled to cAMP-protein kinase A (PKA), protein kinase C (PKC), and calcium signaling pathways. We examined the effect of selective signaling agonists and antagonists on RGS-2 expression in MOB cells to determine which pathway(s) mediates PTH-induced RGS-2 expression. Although selective activation of all three pathways led to RGS-2 expression, cAMP-PKA activation with 10 nmol/L PTH and 10 micromol/L forskolin elicited the strongest induction. Similarly, RGS-2 mRNA expression was most strongly inhibited by the PKA inhibitor, H89 (10-30 micromol/L). The phorbol ester, PMA (1 micromol/L), which activates the PKC pathway, and ionomycin (1 micromol/L), which activates the calcium pathway, produced small but detectable elevations in RGS-2 mRNA levels. Overnight treatment with 1 micromol/L PMA to deplete PKC did not affect subsequent RGS-2 induction by PTH, but significantly inhibited PMA-induced RGS-2 expression. Treatment with 1-100 nmol/L PTH(3-34), which does not activate cAMP-PKA signaling, did not induce RGS-2 expression. MOB cells pretreated with 3 microg/mL cycloheximide produced sustained RGS-2 mRNA levels 2 h after 10 nmol/L PTH treatment. Actinomycin D (5 microg/mL) completely blocked 10 nmol/L PTH-induced RGS-2 expression. Finally, we tested the effect of RGS-2 overexpression on PTH- and fluprostenol-induced interleukin (IL)-6 promoter activity in MOB cells. PTH induces IL-6 through PKA activation, whereas fluprostenol induces IL-6 through PKC activation. We found that RGS-2 overexpression significantly inhibited IL-6 promoter activity following fluprostenol treatment, but not following PTH treatment. We conclude that RGS-2 is a PTH-induced primary response gene in murine osteoblasts that is induced mainly through the cAMP-PKA pathway and specifically inhibits Galphaq-coupled receptors.
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Affiliation(s)
- A Tsingotjidou
- Division of Diagnostic and Surgical Sciences, UCLA School of Dentistry, Los Angeles, CA 90095-1668, USA
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Peng KW, Pham L, Ye H, Zufferey R, Trono D, Cosset FL, Russell SJ. Organ distribution of gene expression after intravenous infusion of targeted and untargeted lentiviral vectors. Gene Ther 2001; 8:1456-63. [PMID: 11593358 DOI: 10.1038/sj.gt.3301552] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2001] [Accepted: 07/06/2001] [Indexed: 11/09/2022]
Abstract
Lentiviral vectors represent an attractive technology platform from which to develop a targetable injectable gene delivery system for transduction of specific cell populations in vivo, irrespective of their cell cycle status. Targeted HIV-1-based lentiviral vectors were generated by pseudotyping them with chimeric murine leukemia virus (MLV) envelope glycoproteins displaying N-terminal targeting polypeptides. Vectors displaying an EGF polypeptide were fully infectious on EGF receptor-negative cells, but were inactive on cells with abundant EGF receptors (inverse targeting). Receptor-mediated inactivation of gene transfer was overcome by competing the EGF receptors on the target cells with soluble EGF or by removing the displayed EGF domain from the surface of the vector particles by factor Xa cleavage of a specific protease substrate engineered into its tethering linker (protease targeting). Intravenous infusion of nontargeted HIV-1 vectors led to maximal luciferase activity in liver and spleen with moderate or minimal activity in heart, skeletal muscle, lung, brain, kidney, ovaries and bone marrow. In contrast, intravenous EGF-displaying vectors were expressed maximally in spleen with very low level luciferase expression detectable in liver (EGF-receptor rich). Liver transduction by the EGF-displaying vector was restored by pretreating the animals with soluble EGF suggesting that these vectors are inversely targeted to spleen.
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Affiliation(s)
- K W Peng
- Molecular Medicine Program, Mayo Foundation, Rochester, MN 55905, USA
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Abstract
Conditionally replicating viruses are promising agents for the treatment of malignancy. Here it is shown that the live attenuated Edmonston-B vaccine strain of measles virus (MV-Edm) replicates selectively in human myeloma cells and has potent antitumor activity. In vitro, replication of MV-Edm was restricted in phytohemagglutinin (PHA)-stimulated peripheral blood lymphocytes (PBLs) but proceeded efficiently in a panel of 6 myeloma cell lines-ARH-77, RPMI 8226, JJN-3, MM1, KAS-6/1, and KMS-11-and in primary myeloma cells isolated by CD138 sorting from the bone marrow aspirates of 6 patients. MV-Edm infection induced potent cytopathic effects in these myeloma cells, resulting in the formation of multinucleated syncytia that eventually became nonviable. In contrast, syncytial formation in PHA-stimulated PBLs was minimal after MV-Edm infection. In vivo, MV-Edm was antitumorigenic and inhibited the establishment of myeloma cells as xenografts in immunocompromised mice. When injected directly into ARH-77 myeloma xenografts in the mice, MV-Edm caused complete regression of these xenografts. MV-Edm administered intravenously into the tail veins of mice also showed significant antineoplastic activity against established RPMI 8226 and ARH-77 xenografts. In particular, the ARH-77 myeloma xenografts were exquisitely sensitive to MV-Edm therapy, and tumors in all mice regressed completely. In light of its selectivity for myeloma cells and its potent antineoplastic activity against myeloma xenografts in vivo, MV-Edm merits further development for the treatment of multiple myeloma.
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Affiliation(s)
- K W Peng
- Molecular Medicine Program and the Department of Hematology, Mayo Foundation, Rochester, MN 55905, USA
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Abstract
BACKGROUND The envelope glycoproteins, surface unit (SU) and transmembrane (TM) of the murine leukemia virus (MLV) are not covalently linked and tend to dissociate upon high-speed centrifugation, leading to loss of vector infectivity. This study describes a gentle and simple method to concentrate MLV vectors or HIV vectors pseudotyped with MLV envelopes. Having a fast and inexpensive method to concentrate large volumes of vector supernatant will facilitate in vivo experiments and clinical trials that require high titer vector stocks. METHODS The methods employed in the study were co-precipitation of viral supernatant with calcium phosphate, low-speed centrifugation, dialysis, and infection assays with Lac-Z transducing vectors. RESULTS Murine leukemia virus vectors and HIV vectors pseudotyped with vesicular stomatitis virus glycoprotein (VSV.G) or MLV envelopes were concentrated successfully using the calcium phosphate co-precipitation method. Parameters that influence virus yield and the reproducibility of the method were investigated. The optimized protocol involves virus harvest in serum-free media, co-precipitation using 60mM calcium chloride, pelleting at 2,000 g, resuspending the pellet in a small volume of 0.1M EDTA-saline, and dialysis against saline to remove EDTA. Volumes were decreased from 300 ml to 10 ml, with 50-100% recovery, and titers can be concentrated up to 1,000-fold. CONCLUSIONS The calcium phosphate co-precipitation method to concentrate virus is applicable to retrovirus and lentivirus preparations. It uses simple techniques and does not require expensive equipment. Multiple rounds of co-precipitation can be carried out if required.
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Affiliation(s)
- L Pham
- Molecular Medicine Program, Mayo Foundation, Rochester, MN 55905, USA
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Bryant J, Pham L, Yoshimura L, Tamayo A, Ordonez N, Ford RJ. Development of intermediate-grade (mantle cell) and low-grade (small lymphocytic and marginal zone) human non-Hodgkin's lymphomas xenotransplanted in severe combined immunodeficiency mouse models. J Transl Med 2000; 80:557-73. [PMID: 10780672 DOI: 10.1038/labinvest.3780061] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [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: 11/09/2022] Open
Abstract
We have used severe combined immunodeficiency (SCID) (c.b.-17, ICR/SCID) mice to develop xenotransplantation (XT) models for human intermediate-and-low-grade non-Hodgkin's lymphomas (NHL). In the past, SCID mice have provided a variety of useful XT models for human hematopoietic neoplasms that primarily involve the acute leukemias and some nonhematopoietic tumors, but only rare reports exist on use of the SCID mouse model in the study of primary tumor cells from NHL. Intermediate-grade and low-grade NHL are the most common lymphomas seen in adults. There is no effective therapy for those types of NHL, and they have not been established in an animal model to date. The lack of an animal model has hampered studies that can evaluate the disease process in vivo as well as the definition of therapeutic parameters involved in treatment. We report in this study that primary patient samples of NHL ( intermediate grade and low grade) have been successfully established in SCID mice after XT. NHL include intermediate-grade (mantle cell lymphoma) and low-grade (eg, small lymphocytic lymphoma/chronic lymphocytic lymphoma and marginal zone lymphoma) forms. Studies have been directed toward creating appropriate conditions for the optimal grafting of these NHL in SCID mice so that the disease process in humans could be accurately simulated. These studies indicate that development of XT-human lymphoma cells in SCID mice appear to be linked to their biologic and/or clinical behavior, transplanted lymphoma cell number, and age, as well as to the natural killer cell status of the SCID mouse recipients. Evidence has also shown that NHL cells can exhibit homing or trafficking patterns in SCID recipients that resemble those observed in patients with gastrointestinal lymphomatous involvement (particularly that of mantle cell lymphoma). Our studies also indicate that artefactual influences, such as the outgrowth of Epstein-Barr virus-associated lymphoblastoid lesions, are rare occurrences in the human NHL/SCID models that we have established.
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Affiliation(s)
- J Bryant
- Department of Molecular Pathology, The University of Texas, M.D. Anderson Cancer Center, Houston 77030, USA
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Husted C, Pham L, Hekking A, Niederman R. Improving quality of life for people with chronic conditions: the example of t'ai chi and multiple sclerosis. Altern Ther Health Med 1999; 5:70-4. [PMID: 10484833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
CONTEXT The greatest needs of people with chronic conditions are long-term care, maximized independence, and improved quality of life. With conventional medicine becoming increasingly expensive, depersonalized, and unable to adequately meet such needs, many with chronic conditions are seeking health promotion strategies to effectively manage their symptoms. OBJECTIVE An 8-week t'ai chi program was conducted to explore psychosocial and physical benefits for those with multiple sclerosis. DESIGN Nonrandomized, noncontrolled pilot study. SETTING American College of Traditional Chinese Medicine, San Francisco, Calif. PATIENTS 19 patients with multiple sclerosis. INTERVENTION T'ai chi. MAIN OUTCOME MEASURES Walking speed (distance = 25 ft), hamstring flexibility, and psychosocial well-being as measured by the Medical Outcomes Study 36-item Short-form Health Survey. RESULTS Walking speed increased by 21% and hamstring flexibility increased by 28%. Patients experienced improvements in vitality, social functioning, mental health, and ability to carry out physical and emotional roles. CONCLUSIONS This pilot program was conducted entirely on a volunteer basis and led to the implementation of several additional t'ai chi classes for people with multiple sclerosis across the United States. T'ai chi and other health promotion programs offer help toward achieving the goals of increasing access to services, maximizing independence, and improving quality of life for people with chronic disabling conditions.
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Affiliation(s)
- C Husted
- Center for the Study of Neurodegenerative Disorders, University of California, Santa Barbara 93106-5060, USA.
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Abstract
Cryosurgery employs freezing to destroy undesirable tissue. However, under certain thermal conditions, frozen tissues survive. The survival of frozen undesirable tissue may lead to complications, such as recurrence of cancer. In a study of nude mice with subcutaneous metastatic prostate tumors, we showed that the preoperative injection of a phosphate-buffered saline solution with 10 mg/ml antifreeze protein of type I into the tumor prior to freezing enhances destruction under thermal conditions which normally yield cell survival. This suggests that the adjunctive use of antifreeze proteins in cryosurgery may reduce the complications from undesirable tissues that survive freezing.
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Affiliation(s)
- L Pham
- Bioengineering Laboratory, Department of Mechanical Engineering, University of California, Berkeley, California 94720, USA
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Alpini G, Glaser SS, Ueno Y, Pham L, Podila PV, Caligiuri A, LeSage G, LaRusso NF. Heterogeneity of the proliferative capacity of rat cholangiocytes after bile duct ligation. Am J Physiol 1998; 274:G767-75. [PMID: 9575860 DOI: 10.1152/ajpgi.1998.274.4.g767] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We previously introduced the concept that intrahepatic bile duct epithelial cells, or cholangiocytes, are functionally heterogeneous. This concept is based on the observation that secretin receptor (SR) gene expression and secretin-induced cAMP synthesis are present in cholangiocytes derived from large (> 15 microns in diameter) but not small (< 15 microns in diameter) bile ducts. In work reported here, we tested the hypothesis that cholangiocytes are heterogeneous with regard to proliferative capacity. We assessed cholangiocyte proliferation in vivo by measurement of [3H]thymidine incorporation and in vitro by both [3H]thymidine incorporation and H3 histone gene expression in small (fraction 1) and large (fraction 2) cholangiocytes isolated from rats after bile duct ligation (BDL). In the two cholangiocyte subpopulations, we also studied basal somatostatin receptor (SSTR2) gene expression as well as the effects of somatostatin on 1) SR gene expression and secretin-induced cAMP synthesis and 2) [3H]thymidine incorporation and H3 histone gene expression. In normal rat liver, cholangiocytes, unlike hepatocytes, were mitotically dormant; after BDL, incorporation of [3H]thymidine markedly increased in cholangiocytes but not hepatocytes. When subpopulations of cholangiocytes were isolated after BDL, DNA synthesis assessed by both techniques was limited to large cholangiocytes, as was SSTR2 steady-state gene expression. In vitro, somatostatin inhibited SR gene expression and secretin-induced cAMP synthesis only in large cholangiocytes. Moreover, compared with no hormone, somatostatin inhibited DNA synthesis solely in large cholangiocytes. These results support the concept of the heterogeneity of cholangiocytes along the biliary tree, extend this concept to cholangiocyte proliferative activity, and imply that the proliferative compartment of cholangiocytes after BDL is located principally in the cholangiocytes lining large (> 15 microns) bile ducts.
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Affiliation(s)
- G Alpini
- Department of Medical Physiology and Internal Medicine, Scott & White Hospital, Temple, Texas, USA
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Hashem GM, Pham L, Vaughan MR, Gray DM. Hybrid oligomer duplexes formed with phosphorothioate DNAs: CD spectra and melting temperatures of S-DNA.RNA hybrids are sequence-dependent but consistent with similar heteronomous conformations. Biochemistry 1998; 37:61-72. [PMID: 9425026 DOI: 10.1021/bi9713557] [Citation(s) in RCA: 25] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Knowledge of the relative stabilities of S-DNA.RNA hybrids of different sequences is important for choosing RNA targets for hybridization with antisense phosphorothioate oligodeoxyribonucleotides (S-DNAs). It is also important to know how hybrid secondary structure varies with sequence, since different structures could influence thermal stability and the activity of RNase H. Our approach has been to study relatively simple sequences consisting of repeating di-, tri-, and tetranucleotides, which allow the maximum resolution of nearest-neighbor effects. Circular dichroism (CD) spectra and melting temperatures were acquired for 16 hybrid sequences that could be formed by mixing S-DNA and RNA oligomers of 24 nucleotides in length. CD spectra of S-DNA.RNA hybrids were sequence-dependent and were similar to those of analogous unmodified hybrids. From singular value decomposition, the major CD spectral component was like that of the A-conformation. Three nearest-neighbor relationships among the hybrid CD spectra were in as good agreement as are such relationships among spectra of duplex RNAs. Tm values ranged from 44.1 degrees C for S-d(ACT)8. r(AGU)8 to 66.6 degrees C for S-d(CCT)8.r(AGG)8 (in 0.15 M K+, phosphate buffer, pH 7). The S-DNA.RNA hybrids had a sequence-dependence of melting temperatures that was approximately the same as that calculated using published data for normal DNA.RNA hybrids [Sugimoto, N., Nakano, S., Katoh, M., Matsumura, A., Nakamuta, H., Ohmichi, T.,Yoneyama, M., & Sasaki, M. (1995) Biochemistry 34, 11211-11216]. In general, sequence-dependent CD spectra and Tm values of S-DNA.RNA hybrids appear to reflect the unique nearest-neighbor interactions of adjacent base pairs, where the S-DNA and RNA strands are in different, but relatively uniform, conformations.
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Affiliation(s)
- G M Hashem
- Program in Molecular and Cell Biology, The University of Texas at Dallas, Richardson 75083-0688, USA
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