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Nursing Informatics: Competency Challenges for Nursing Faculty. Stud Health Technol Inform 2024; 310:1196-1200. [PMID: 38270004 DOI: 10.3233/shti231154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2024]
Abstract
Nursing is the largest workforce in health care with nurses increasingly required to work with digital health technologies. However, despite the adoption of nursing informatics in Australia in the mid-1980s, nursing graduates are not being adequately equipped to use these technologies in a way that benefits the profession and improves patient care. Using a scoping review approach, this paper presents an analysis of contemporary published literature and describes the barriers to faculty engagement with digital health technologies in undergraduate nursing education. Thirty five articles were included and identified faculty lack of understanding of nursing informatics and resistance to technologies, limited infrastructure and expenditure, and limited educational resources and best practice recommendations as significant barriers to the integration of nursing informatics into undergraduate nursing curricula. Recommendations for faculty development will be explored.
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Challenging the Myth of the Digital Native: A Narrative Review. NURSING REPORTS 2023; 13:573-600. [PMID: 37092480 PMCID: PMC10123718 DOI: 10.3390/nursrep13020052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/15/2023] [Accepted: 03/16/2023] [Indexed: 04/09/2023] Open
Abstract
Background and Aims: Nurses are increasingly engaging with digital technologies to enhance safe, evidence-based patient care. Digital literacy is now considered a foundational skill and an integral requirement for lifelong learning, and includes the ability to search efficiently, critique information and recognise the inherent risk of bias in information sources. However, at many universities, digital literacy is assumed. In part, this can be linked to the concept of the Digital Native, a term first coined in 2001 by the US author Marc Prensky to describe young people born after 1980 who have been surrounded by mobile phones, computers, and other digital devices their entire lives. The objective of this paper is to explore the concept of the Digital Native and how it influences undergraduate nursing education. Materials and Methods: A pragmatic approach was used for this narrative review, working forward from Prensky’s definition of the Digital Native and backward from contemporary sources of information extracted from published health, education and nursing literature. Results: The findings from this narrative review will inform further understanding of digital literacy beliefs and how these beliefs influence undergraduate nursing education. Recommendations for enhancing the digital literacy of undergraduate nursing students are also discussed. Conclusions: Digital literacy is an essential requirement for undergraduate nursing students and nurses and is linked with safe, evidence-based patient care. The myth of the Digital Native negates the reality that exposure to digital technologies does not equate digital literacy and has resulted in deficits in nursing education programs. Digital literacy skills should be a part of undergraduate nursing curricula, and National Nursing Digital Literacy competencies for entry into practice as a Registered Nurse should be developed and contextualised to individual jurisdictions.
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Evaluating fundamental care knowledge to inform educational leadership. J Adv Nurs 2023; 79:1174-1188. [PMID: 35467759 DOI: 10.1111/jan.15279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 04/04/2022] [Accepted: 04/13/2022] [Indexed: 11/29/2022]
Abstract
AIM To explore undergraduate nursing students' understanding of fundamental care and identify educational leadership opportunities to deepen students' understanding of fundamental care concepts. DESIGN Sequential-explanatory mixed methods study. METHODS We conducted a cross sectional survey (n = 202) and focus groups (n = 24) to explore undergraduate nursing students' ability to identify fundamental care needs. All data were collected between November 2020 and April 2021. Survey data were analysed using descriptive and inferential statistics and focus group data were thematically analysed. RESULTS Year One students scored significantly lower in their ability to identify fundamental care needs compared with students in other years, even after controlling for route, gender and age. Post-degree students scored significantly higher than direct entry or transfer students. Students ≤19 years of age had significantly lower scores compared with students ≥25 years of age. Our focus group findings highlighted that students were often unable to define fundamental care, but they identified learning about various components of fundamental care in a variety of ways. While students understood that fundamental care was required in all settings, they were challenged in providing this care in acute and virtual settings. Students shared several suggestions to support fundamental care skills development across the curriculum. CONCLUSIONS There is a need for a clear definition and description of the fundamentals of care that is used consistently by faculty, students and curriculum documents. It is important to encourage and support educators to share real-world nursing stories, offer students time to share their personal experiences, develop creative learning opportunities and foster student reflection to deepen students' understanding of the fundamentals of care. IMPACT Educators need support to meaningfully incorporate fundamentals of care learning opportunities across multiple care settings. Educational leaders can use these findings to develop or adapt their curricula to support fundamental care skill development.
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International research collaborations: Lessons learned and practical tips. NURSE EDUCATION TODAY 2022; 119:105591. [PMID: 36257079 DOI: 10.1016/j.nedt.2022.105591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 09/26/2022] [Accepted: 10/05/2022] [Indexed: 06/16/2023]
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The impact of virtual simulation on the recognition and response to the rapidly deteriorating patient among undergraduate nursing students. NURSE EDUCATION TODAY 2022; 110:105264. [PMID: 35030352 DOI: 10.1016/j.nedt.2021.105264] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 12/10/2021] [Accepted: 12/29/2021] [Indexed: 05/29/2023]
Abstract
A major patient safety challenge is recognition and response to deteriorating patients since early warning signs are often not detected in a timely manner. Nursing students typically learn the skills for early identification through clinical placement, but clinical placements are not guaranteed to provide exposure to deteriorating patients. Nursing students require practice with emergency scenarios to develop their competency and confidence to act in this area. This study aimed to explore the impact of a virtual simulation intervention on the recognition and response to the rapidly deteriorating patient among undergraduate nursing students. A mixed methods study involving a quasi-experimental pre/post design and focus groups. The participants were third or final year undergraduate nursing students from five university sites across four countries (Canada, England, Scotland and Australia, n = 88). Students were randomly assigned to a treatment or control group. The treatment group received a virtual simulation intervention and participated in a focus group. The virtual simulation intervention had a significant effect on improving nursing student knowledge and clinical self-efficacy in the recognition and response to the rapidly deteriorating patient. Students reported that the virtual simulations decreased anxiety, helped them prioritize, filled gaps in their learning, and encouraged autonomous learning within a safe 'low risk' environment. Virtual simulation is an effective strategy for improving knowledge and confidence in recognizing and responding to the rapidly deteriorating patient among undergraduate nursing students.
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Co-debriefing Virtual Simulations: An International Perspective. Clin Simul Nurs 2022. [DOI: 10.1016/j.ecns.2021.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Defining Nursing Informatics: A Narrative Review. Stud Health Technol Inform 2021; 284:108-112. [PMID: 34920485 DOI: 10.3233/shti210680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Healthcare has experienced rapid transformation with the development of digital technologies which aim to make healthcare safer and more efficient. In response, health informatics has evolved, including nursing informatics, which integrates nursing, information and communication technologies (ICT) and professional knowledge to improve patient outcomes. New language has developed to describe informatics and its processes; however, this has generally been poorly understood. This paper will describe current definitions of nursing informatics from three different healthcare contexts: Australia, the United States of America and Canada, to identify the similarities and differences between these definitions and to summarise the distinct bodies of knowledge described by each country. These countries have amongst the oldest definition attempts in the literature. A pragmatic approach was taken in this narrative review, working forward from historic references and backwards from recent references extracted from published health and nursing informatics literature.
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Can a community empowerment intervention improve health and wellbeing in a post-industrial UK town? Eur J Public Health 2020. [DOI: 10.1093/eurpub/ckaa165.229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
'Local People' programme operates in 29 UK communities experiencing disadvantage and economic stressors that impact on population wellbeing. The programme uses a community empowerment approach to increase social connections, and collective control, improve health, and reduce inequalities. This links to SDGs 3 and 11. Mechanisms include a decision-making group led by residents, a project lead, funding, and support from a national charity.
Methods
A mixed method evaluation was conducted (2017-19) to identify processes and assess outcomes and impacts. This presentation outlines the findings from five in-depth qualitative case studies (c140 interviews) with emphasis on one post-industrial UK town suffering from the effects of industrial decline. A within case and cross case qualitative analysis was undertaken using a thematic framework.
Results
Priorities set by local areas focused on increasing community involvement and connections between people. A wide range of activities took place including regular classes and community events. The five case studies found strong qualitative evidence of increased social connectedness, community spirit and a sense of purpose, along with the area becoming a better place to live. People involved in project delivery gained confidence and skills, improved their wellbeing and gained a sense of control. There is, as yet, limited evidence that increased involvement has influenced the wider determinants of health. In the post-industrial town, people's social networks expanded, enriching their lives and providing missed companionship. Participants in the programme reported improved mental and physical health, as well as increased confidence and skills. Involvement gave a voice to marginalised older people in the area.
Conclusions
Empowering communities and putting residents in control can lead to improvements in connectedness and some aspects of health and wellbeing, even in post-industrial towns facing considerable and complex challenges.
Key messages
The community empowerment programme increased social connectedness. The programme led to improved mental and physical health in participants.
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An example of involving lay people to enhance complex public health intervention evaluations. Eur J Public Health 2020. [DOI: 10.1093/eurpub/ckaa166.304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Despite growing interest in understanding complex systems and public health interventions, research methodologies that take account of system-wide action are relatively underdeveloped. Community-based participatory research (CBPR) is steered and conducted by people with lived experience of the issues being researched. This paper explores the value of CBPR in complex public health intervention evaluations. The 'Local People' and 'Local Conversations' programmes use a community empowerment approach in 50 communities across the UK experiencing social disadvantage to increase social connections and collective control, improve health and wellbeing, and reduce inequalities (linked to SDG 3 and 11).
Methods
Evaluation of the programmes followed a mixed-methods design, including qualitative case studies, longitudinal survey, process appraisal, and CBPR. Residents from 10 communities across the programmes each undertook 2 rounds of CBPR. These projects resulted in written reports, which were analysed thematically alongside other data sources.
Results
There was some variation in the scope and design of the 20 completed CBPR projects. Whilst projects did not generally extend beyond the scope of the overall evaluation, peer research provided information from residents that were inaccessible to other data collection streams. Gathering community (lay) knowledge improved understanding of local priorities and actions within the programmes. However, the utility of CBPR was less consistent for community-researchers and local communities, often failing to support project development. Some community-researchers felt unprepared for the activity despite support from the academic team.
Conclusions
Conducted appropriately, CBPR can elicit data that would be less accessible through externally led research. This study highlights the value of CBPR in complex programme evaluations, enabling a deeper understanding of social context in which interventions occur.
Key messages
CBPR complements more traditional research methodologies in complex public health evaluation designs. CBPR can enable a deeper understanding of social processes necessary for the success of complex public health interventions that might be beyond the scope of other methodologies.
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Impact of a community empowerment programme in disadvantaged UK neighbourhoods: results of a survey. Eur J Public Health 2020. [DOI: 10.1093/eurpub/ckaa166.146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
A community empowerment programme in the UK aims to enable people to have greater collective control over area-based decision making, improved health and wellbeing and reduce health inequalities, by providing small grants to support residents of deprived neighbourhoods and communities of interest to come together to take action on issues of importance to them.
Methods
A survey was conducted at 4 6-month intervals as part of a mixed methods evaluation, to collect data about participant demographics, level of involvement, opinions of the project, and impacts. The survey was self-completed online or on paper, and distributed by local project leads. Outcome questions were adapted from the UK Government Community Life Survey to facilitate comparison with national statistics. Data were analysed using SPSS to produce descriptive statistics, supported by inferential statistical tests where appropriate. Regression analysis using multi-level modelling was used to estimate the conditional correlation between health outcome and Local People project participation.
Results
1053 people from 29 local areas responded to the survey over the 4 time points; only 93 responded more than once. 43% took part in project activities, 36% were local project committee members and 19% were volunteers. The analysis found positive impacts on confidence, control, friendships, skills, happiness, life satisfaction, feelings of worth (p < 0.05), and that greater length and degree of involvement in the projects were associated with greater positive impacts on all of these outcomes.
Conclusions
The survey provides tentative evidence that participation in a community empowerment initiative may result in improved wellbeing, feelings of power and control, sense of belonging and trust. People who are involved for longer or more deeply involved are more likely to see these impacts. More community-based survey research is needed to gather people's views on neighbourhood initiatives.
Key messages
An evaluation of a community empowerment programme found positive impacts on control, wellbeing, belonging and trust. Greater length or degree of involvement were associated with greater impact.
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The Care Informatics and Technologies Project - Enhancing Capability, Motivation and Opportunities in Digital Health Among Health Professionals and Students. Stud Health Technol Inform 2019; 266:25-29. [PMID: 31397297 DOI: 10.3233/shti190768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A change in the behaviour of the current and future workforce in regards to how they approach the needs and challenges in the healthcare sector is necessary to transit from the current curative paradigm in health to a new one focused on prevention and rational use of resources. Digital health is instrumental in the adoption of this new paradigm as most e-health applications focus on a preventive and personalized approach, on lifestyle changes (e.g. fitness and nutrition), health literacy and self-tracking allowing consumers to manage their own heath. The Capability-Opportunity-Motivation Behaviour (COM-B) model and the Behaviour Change Wheel framework (BCW) have been applied to characterise interventions for behaviour change in health professionals. They provide a systematic way of characterising interventions and enable their outcomes to be linked to mechanisms of action. Acknowledging the potential of informatics and technologies in current and emerging health issues and the importance of focusing on care needs rather than on the development of technologies per se to achieve meaningful clinical outcomes, the College of Nursing and Health Sciences (CNHS) in Flinders University is undertaking the Care Informatics and Technologies project. This priority project aims to build capacity in digital health within the College's students and staff, so that informatics, digitisation and technologies become part of clinical learning, research and ongoing clinical practice. We aim to report the protocol of this project and discuss it in the context of the expected change in behaviour of health professionals that is deemed necessary to address the Australian digital health agenda.
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The use of digital badges by undergraduate nursing students: A three-year study. Nurse Educ Pract 2018; 32:1-8. [PMID: 29981502 DOI: 10.1016/j.nepr.2018.06.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 05/20/2018] [Accepted: 06/28/2018] [Indexed: 11/25/2022]
Abstract
During a three-year study, 32% (n = 67) in 2015, 16% (n = 44) in 2016 and 55% (n = 161) of students in 2017 expressed an interest in using digital badges to enhance their learning. But who are these students? This paper explores the features of students who are interested in using digital badges as a motivational reward to prepare for weekly face-to-face classes through engaging with online activities and resources. This paper uses a first-year undergraduate Bachelor of Nursing bioscience topic at an Australian university to report nursing students' interests around playing games, their digital badge history during the topic, and their self-reported attitudinal interest in using digital badges to enhance and personalise their learning. Overall, the results indicate that some students chose to enhance their learning potential in class by earning digital badges prior to class. The results of this paper are relevant for nursing educators and educational designers seeking to integrate digital badges into motivational teaching practices, by evaluating the role digital badges play as a motivational game-based learning design element.
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Refining Liver Safety Risk Assessment: Application of Mechanistic Modeling and Serum Biomarkers to Cimaglermin Alfa (GGF2) Clinical Trials. Clin Pharmacol Ther 2017; 102:961-969. [PMID: 28419467 PMCID: PMC5697568 DOI: 10.1002/cpt.711] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 03/14/2017] [Accepted: 04/09/2017] [Indexed: 02/06/2023]
Abstract
Cimaglermin alfa (GGF2) is a recombinant human protein growth factor in development for heart failure. Phase I trials were suspended when two cimaglermin alfa‐treated subjects experienced concomitant elevations in serum aminotransferases and total bilirubin, meeting current US Food and Drug Administration criteria for a serious liver safety signal (i.e., “Hy's Law”). We assayed mechanistic biomarkers in archived clinical trial serum samples which confirmed the hepatic origin of the aminotransferase elevations in these two subjects and identified apoptosis as the major mode of hepatocyte death. Using a mathematical model of drug‐induced liver injury (DILIsym) and a simulated population, we estimated that the maximum hepatocyte loss in these two subjects was <13%, which would not result in liver dysfunction sufficient to significantly increase serum bilirubin levels. We conclude that the two subjects should not be considered Hy's Law cases and that mechanistic biomarkers and modeling can aid in refining liver safety risk assessment in clinical trials.
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Flight nurses in Australia: Maintaining their midwifery competence – a case study. Contemp Nurse 2014; 43:121-30. [DOI: 10.5172/conu.2012.43.1.121] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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E-learning & information communication technology (ICT) in nursing education: A review of the literature. NURSE EDUCATION TODAY 2014; 34:1311-23. [PMID: 23786869 DOI: 10.1016/j.nedt.2013.05.002] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Revised: 04/27/2013] [Accepted: 05/02/2013] [Indexed: 05/06/2023]
Abstract
OBJECTIVES To examine primary research articles published between January 2001 and December 2012 that focused on the issues for students and educators involved with E-learning in preregistration nursing programs. The literature was systematically reviewed, critically appraised and thematically analyzed. BACKGROUND E-learning is arguably the most significant change to occur in nursing education since the move from hospital training to the tertiary sector. Differences in computer and information literacy for both students and educators influence the success of implementation of E-learning into current curricula. DATA SOURCES Online databases including CINAHL, MEDLINE, OVID, the ProQuest Central, PubMed, ERIC and Science Direct were used. METHODS The criteria used for selecting studies reviewed were: primary focus on electronic learning and issues faced by nursing students and/or nurse educators from undergraduate preregistration nursing programs; all articles had to be primary research studies, published in English in peer reviewed journals between January 2001 and December 2012. RESULTS Analysis of the 28 reviewed studies revealed the following three themes: issues relating to E-learning for students; use of information technologies; educator (faculty) issues involving pedagogy, workload and staff development in E-learning and associated technology. CONCLUSION The review highlighted that commencing preregistration nursing students required ongoing education and support surrounding nursing informatics. This support would enable students to progress and be equipped with the life-long learning skills required to provide safe evidence based care. The review also identified the increased time and skill demands placed on nurse educators to adapt their current education methodologies and teaching strategies to incorporate E-learning.
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Flight Nurses in Australia: Maintaining their midwifery competence: A case study. Contemp Nurse 2012. [DOI: 10.5172/conu.2012.3075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Design of a compact electron cyclotron resonance ion source for medium charge state light ions. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:02A322. [PMID: 22380169 DOI: 10.1063/1.3669789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
At the Australian Nuclear Science and Technology Organization we are developing a new isotope ratio mass spectrometer based on the measurement of multiple charge state ions. We have carried out a review of our existing ECR ion source and identified a number of design flaws. For the new instrument, we are producing a new ECR source and have refined the design, in particular by using 3D simulations to improve the magnetic confinement field and by a combination of simulations and experiments to improve the design of the microwave coupling.
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Third-Year Undergraduate Nursing Students’ Perceptions of High-Fidelity Simulation. J Nurs Educ 2010; 49:632-9. [DOI: 10.3928/01484834-20100831-01] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2009] [Accepted: 02/10/2010] [Indexed: 11/20/2022]
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The neurotensin agonist NT69L improves sensorimotor gating deficits in rats induced by a glutamatergic antagonist, but not by dopaminergic agonists. Behav Brain Res 2009; 202:192-7. [PMID: 19463701 DOI: 10.1016/j.bbr.2009.03.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Revised: 03/23/2009] [Accepted: 03/24/2009] [Indexed: 11/29/2022]
Abstract
An imbalance between different neurotransmitter systems is involved in the pathophysiological processes underlying schizophrenia. Since the neurotensin (NT) system modulates the activity of several of these neurotransmitters, drugs acting upon the NT system may act as novel antipsychotic drugs. This hypothesis is supported by studies with NT in animal models. For example, intracranial injection of NT improves sensorimotor gating in rats [Feifel D, Minor KL, Dulawa S, Swerdlow NR. The effects of intra-accumbens neurotensin on sensorimotor gating. Brain Research 1997;760:80-4]. NT-mimetics, such as NT69L, have been developed which are more resistant to enzymatic degradation than the native NT peptide. In the present study, the potential antipsychotic properties of NT69L were evaluated in a rat pre-pulse inhibition (PPI) paradigm. PPI is a measure of sensorimotor gating where a weak auditory stimulus, or pre-pulse, inhibits the startle response to a strong stimulus, or pulse. Schizophrenic patients exhibit deficits in their PPI response. This condition can be mimicked in rats with psychotomimetic drugs and the resulting PPI deficit is reversed by antipsychotic drugs. NT69L (0.1-10mg/kg i.p.) reversed disruptions of the PPI response induced by the NMDA antagonist dizocilpine (0.1mg/kg s.c.) for at least 1-h post-injection, but did not reverse disruptions induced by the dopaminergic agonists apomorphine and d-amphetamine (0.5 and 5mg/kg s.c., respectively). These results confirm that NT69L possesses antipsychotic-like activity and therefore could be beneficial in the treatment of schizophrenia.
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Performance of an electron cyclotron resonance ion source designed for isotope ratio mass spectrometry. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2008; 79:02A304. [PMID: 18315094 DOI: 10.1063/1.2804878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We have designed, built, and tested an electron cyclotron resonance ion source suited to the needs of an experimental program examining new methods of isotope ratio mass spectrometry using multiply charged ions. Contaminant levels have been reduced to low levels. Sample absorption and desorption effects are under investigation and preliminary results are presented.
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Clinical evaluation of the FloTrac/Vigileo system and two established continuous cardiac output monitoring devices in patients undergoing cardiac surgery. Br J Anaesth 2007; 99:329-36. [PMID: 17631509 DOI: 10.1093/bja/aem188] [Citation(s) in RCA: 129] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Assessment of cardiac output (CO) by the FloTrac/Vigileo system may offer a less invasive means of determining the CO than either the pulmonary artery catheter (PAC) or the PiCCOplus system. The aim of this study was to compare CO measurements made using the FloTrac/Vigileo system with upgraded software (FCO, Edwards Lifesciences, Irvine CA, USA), the PiCCOplus system (PCO, Pulsion Medical Systems, Munich, Germany) and continuous CO monitoring using a PAC (CCO; Vigilance monitoring, Edwards Lifesciences, Irvine CA, USA) with intermittent pulmonary artery thermodilution (ICO). The study was conducted in patients undergoing elective cardiac surgery. METHODS Thirty-one patients with preserved left ventricular function were enrolled. CCO, FCO, and PCO were recorded in the perioperative period at six predefined time points after achieving stable haemodynamic conditions; ICO was determined from the mean of three bolus injections. Bland-Altman analysis was used to compare CCO, FCO, and PCO with ICO. RESULTS Bland-Altman analysis revealed a comparable mean bias and limits of agreement for all tested continuous CO monitoring devices using ICO as reference method. Agreement for all devices decreased in the postoperative period. CONCLUSION The performance of the FloTrac/Vigileo system, the PiCCOplus, and the Vigilance CCO monitoring for CO measurement were comparable when tested against intermittent thermodilution in patients undergoing elective cardiac surgery.
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Abstract
OBJECTIVE The objective of this study was to explore the experiences of people living with a suprapubic catheter. METHOD This descriptive study was guided by the philosophy of Gadamerian hermeneutics. Data were gathered via indepth interviews with 6 adults living in the community who had a suprapubic catheter for long-term urinary bladder drainage. Interpretation of the data occurred via thematic analysis of the participants' stories. RESULTS Two distinct but interrelated themes emerged. Participants shifted, over time, from negative to positive experiences (psychologically, physically, and practically) to adjustment to life with a catheter. Participants also related that health professionals had not adequately prepared or supported them as they learned to live with a suprapubic catheter. Many of the participants' initial negative experiences were augmented by this deficiency. Issues revolved around perceptions of being psychologically unprepared, the changed body image, altered sexuality, and support needs. CONCLUSION The findings of this study revealed that the insertion of a suprapubic catheter brought about significant life changes for the participants. The data highlighted disparities between the needs of people who have a supra-pubic catheter and health professionals' perceptions of their needs.
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Clinical evaluation of the FloTrac/Vigileo system and two established methods for continuous cardiac output monitoring in patients undergoing cardiac surgery. Crit Care 2007. [PMCID: PMC4095352 DOI: 10.1186/cc5459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
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National Asthma Council Australia's six step asthma management plan: is it working for young adults? Collegian 2003. [DOI: 10.1016/s1322-7696(08)60075-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Abstract
The objective of this study was to investigate differences within individual subjects in the ability to activate the quadriceps, plantar flexors (PF), dorsiflexors (DF), and elbow flexors (EF) during isometric contractions. Twelve male subjects performed submaximal and maximal voluntary isometric contractions, and maximal tetanic contractions were also induced by electrical stimulation. The interpolated twitch technique was used to gauge the extent of muscle inactivation or inability to produce maximum force. Measurements included torque output, absolute and relative rate of force development (RFD), and percentage of muscle inactivation. The quadriceps exceeded all other muscle groups in voluntary and tetanic torque output, voluntary absolute RFD, and absolute and relative tetanic RFD. The quadriceps also exceeded the PF and DF in voluntary relative RFD and had greater muscle inactivation (15.5%) than the EF (5.0%), PF (5.0%), and DF (1.3%). Although the higher RFD may suggest a higher percentage of type II fibers in the quadriceps, their higher threshold of recruitment leads to greater difficulty in fully activating the quadriceps.
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Nonrandom rearrangements of 6p in malignant hematological disorders. CANCER GENETICS AND CYTOGENETICS 2000; 121:22-5. [PMID: 10958936 DOI: 10.1016/s0165-4608(00)00222-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
It is very uncommon to observe nontranslocation abnormalities (NTAs) involving the short arm of chromosome 6 (6p) in malignant hematological disorders (MHDs). By using conventional cytogenetics and fluorescence in situ hybridization (FISH) with chromosome-microdissection probes specific for 6p21 and 6p25, we observed five patients with myeloid malignancies and two patients with lymphoid malignancies to have 6p NTAs. On the basis of our data and those in the literature, it is possible to divide 6p NTAs into the following three groups in MHD: The first group presents with 6p NTAs as a sole or primary change in myeloid malignancies. There are only two cases reported in this group, including one case with del(6)(p23) and the present case with ins(6)(q23p23p25) identified by FISH only. The second group presents with 6p deletions as a sole or primary change in lymphoid malignancies. Three cases have been reported in this group, including one case with del(6)(p21p23), one with del(6)(p21), and the present case 2 with del(6)(p21). The third group has 6p deletions in addition to other known primary changes, present in both myeloid and lymphoid disorders, with 36 cases reported, including five cases from our series. Deletions involving 6p21, 6p22, or 6p23 have been observed in both myeloid and lymphoid disorders. The present data provide cogent information for further molecular characterization of 6p anomalies in MHD.
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Consensus guidelines for the promotion and management of continence by primary health care teams: development, implementation and evaluation. NHS Executive Nursing Directorate. J Adv Nurs 1998; 27:91-9. [PMID: 9515613 DOI: 10.1046/j.1365-2648.1998.00505.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A project was undertaken as part of the NHS Executive Strategy for Major Clinical Guidelines, involving the development of national clinical guidelines for the promotion and management of continence by primary health care teams, through the process of managed consensus based on scientific review. The guidelines were then implemented at one urban general practice. This article outlines the development and implementation of the guidelines and describes the study undertaken to evaluate the impact of implementation on clinical outcomes. The study involved a pre-and post-implementation postal survey of a random sample of 17% of patients aged 18 years and over from the practice (n = 1503). The pre-implementation survey determined the period prevalence of incontinence, related biological data and data on the pre-implementation management of incontinence. Incontinence sufferers were invited to have their condition assessed or reviewed. All sufferers who agreed to be followed-up were sent the post-implementation survey, which identified those patients who had sought help, and ascertained reasons for not seeking help. Data on the management of incontinence post-implementation were also obtained. Clinical outcomes measured pre- and post-implementation were a validated severity index for urinary incontinence, (also adapted for faecal incontinence) and perception of the incontinence as a problem. A 3-month period was allowed between pre- and post-implementation surveys. The study confirmed previous research which showed that few incontinence sufferers respond to invitations to seek help, and that help-seeking behaviour was significantly related to severity of incontinence. The guidelines did not have any positive impact on the clinical outcomes measured, although slight improvements in approaches taken by the primary health care team to the promotion and management of continence were recorded. However, the study was limited by the small sample size and short time scale. Further evaluation of the impact of the guidelines on these outcomes is therefore recommended.
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Experiences of encouraging student-centred learning within a wellness-oriented curriculum. NURSE EDUCATION TODAY 1996; 16:406-412. [PMID: 9025536 DOI: 10.1016/s0260-6917(96)80046-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
This paper describes the use of learning logs as a tool for self-assessment and reflection during a 'well people' module within a Bachelor of Nursing programme. A qualitative analysis of the students' learning goals and reflective accounts from the learning logs are presented, together with extracts from the written evaluation of the module. Recommendations are made for enhancing the potential of the learning log as a flexible learning tool which can help students to draw upon professional knowledge in order to make sense of their experiences.
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Abstract
Local delivery of serotonin (5-HT) produces a rapid edematous response in soft tissues via increased fluid extravasation which is prevented by 5-HT2 antagonists such as ketanserin or mianserin. Here we report the effects of a new class of aminoguanidine 5-HT2 antagonists, with relative selectivity for 5-HT2A receptors which are potent inhibitors of 5-HT-induced paw edema in the rat. Radioligand binding studies with 125I DOI on human 5-HT2A and 5-HT2C receptors and with 3H-5-HT on human 5-HT2B receptors demonstrated that, LY314228, and LY320954 displayed some selectivity for the 5-HT2A receptor. When compared to binding at other 5-HT2 receptor subtypes, LY314228 had an 18.6-fold greater affinity for the 5-HT2A site over the 5-HT2B site, and 2.6 fold greater at the 5-HT2C site. LY320954 displayed similar preference for 5-HT2A sites. Both compounds also inhibited 5-HT-induced paw swelling in rats, with ED50's of 6.4 and 4.8 mg/kg (for LY314228 and LY320954, respectively). These studies offer evidence for a novel class of pharmacophores for the 5-HT2 receptor family which show greater relative affinities for the 5-HT2A receptor subclass.
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Aequorin targeted to the endoplasmic reticulum reveals heterogeneity in luminal Ca++ concentration and reports agonist- or IP3-induced release of Ca++. Mol Biol Cell 1996; 7:419-34. [PMID: 8868470 PMCID: PMC275894 DOI: 10.1091/mbc.7.3.419] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
A chimeric protein (ERaeq) comprised of the invariant chain (Ii) of class II major histocompatability complex (MHC-II) and aequorin was localized in the endoplasmic reticulum (ER) of transfected human embryonal kidney 293 cells. The targeted aequorin resided in the lumen of the ER membrane system, including the nuclear cistern, and following addition of the chromophore coelenterazine underwent Ca(++)-activated chemiluminescence. The majority of chemiluminescence produced by coelenterazine treatment of ERaeq-expressing 293 cells was consumed rapidly (within 2-4 min) upon re-addition of Ca++ to coelenterazine-loaded cells, a finding consistent with very high Ca++ concentrations (approximately 10(-5)-10(-3) M Ca++ ion) inside the ER. However, following the initial rapid consumption of ERaeq chemiluminescence, the activity that remained (10-30% of total sample luminescence of permeabilized cells or 50-70% of total sample luminescence of intact cells) was found to produce a stable baseline corresponding to a Ca++ ion concentration < or = 1-2 microM. The stable baseline of luminescence observed following rapid consumption of the majority of the sample's activity was not derived from re-binding of fresh chromophore to spent photoprotein, suggesting that a minority fraction of the ER membrane system within which the ERaeq chimera was distributed contained a relatively low Ca++ concentration. Addition of IP3 to digitonin-permeabilized cells, or agonist treatment of intact cells decreased this residual signal. Luminescence recordings from cells expressing an ER-targeted aequorin with relatively high affinity for Ca++ thus reveal heterogeneity in luminal ER Ca++ concentration and permit observation of receptor- and IP3-activated release of Ca++ from the ER membrane system.
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Abstract
A Qualitative Evaluation Strategy was adopted to explore an early curriculum experience of undergraduate pre-registration student nurses. Open-ended narratives, in the style of Illuminative Evaluation (Parlett & Hamilton 1972), were used to encourage students to reflect upon their experience of conducting their first patient assessment using a model of nursing. A content analysis of the students' reflections is presented and discussed with reference to studies whose findings they corroborate and support. Aspects of the learning experience which influence the development of nursing skills were elucidated, together with the learning processes involved in the acquisition of patient assessment skills. Evaluating the context of the students' learning environment revealed some of the realities of learning nursing 'in the field', a lack of role models in clinical areas and the persistence of a theory-practice gap. In addition, this study shed light on the process of professional socialisation in student nurses. Encouraging reflection helped the students recognise how much they had learnt, and enabled us to evaluate our effectiveness as learning facilitators. An electic approach combining both qualitative and quantitative paradigms is advocated for holistic evaluation of the curriculum. Inferences from this evaluation may have particular relevance for designers and teachers of Project 2000 style courses.
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Abstract
The pale yellow redox indicator 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) is reduced to a dark blue end-product, MTT-Formazan, by the mitochondrial dehydrogenases of living cells. MTT reduction can be measured spectrophotometrically at a wavelength of 570 nm and a method is described to assay the cidal activity of Williopsis mrakii killer toxin against sensitive cells of Candida glabrata. The MTT assay is rapid, quantitative and compares favourably with traditional plating techniques for the assessment of sensitive viability.
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Immediate-early gene expression in response to hypertrophic and proliferative stimuli in pulmonary arterial smooth muscle cells. J Biol Chem 1994; 269:6399-404. [PMID: 8119989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Remodeling of the pulmonary vascular tree in pulmonary hypertension is associated with hypertrophy and proliferation of smooth muscle cells. Since the stimuli and signaling pathways for these processes are not well understood, we used a rat pulmonary arterial smooth muscle cell line (PAC1) to examine the effects of thrombin and platelet-derived growth factor (PDGF) on cellular growth and immediate-early gene expression. Over 72 h, thrombin (1 unit/ml) caused hypertrophy as reflected by a 102 +/- 12% increase in protein synthesis and a 49 +/- 11% increase in protein content per cell, but no change in cell number. PDGF (2.5 ng/ml) stimulated proliferation as evidenced by an increase in cell number (doubling in 5 days), but no significant change in protein content per cell. Immediate-early gene expression was examined by Northern blotting: both thrombin and PDGF induced egr-1, c-fos, c-jun, junB, and fra-1 mRNAs within 15 min; the response was maximal at 30-60 min (increases ranging from 2.9- to 9.3-fold over control serum-deprived cells) and returned to base-line levels within 2-4 h. Neither agent affected junD mRNA levels. However, thrombin but not PDGF, caused an increase in fosB mRNA levels (7.7 +/- 4.0-fold higher than control, n = 12, p < 0.0005). The immediate-early gene response to both agonists was generally dependent on extracellular Ca2+, Na2+/H+ exchange, and protein kinase C activation, but not on cAMP. The exception was c-jun mRNA, the levels of which were not affected by inhibition of protein kinase C, but decreased significantly by prevention of cAMP formation. Thapsigargin-sensitive intracellular Ca2+ stores were necessary for the response to thrombin, but not to PDGF. These results demonstrate that thrombin is a hypertrophic agent and that PDGF is a proliferative agent in PAC1 cells. These two agonists stimulate increases in a variety of immediate-early gene mRNAs, but only thrombin induces fosB mRNA.
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MESH Headings
- Animals
- Calcium/metabolism
- Cell Division/drug effects
- Cell Line
- Egtazic Acid/pharmacology
- Gene Expression/drug effects
- Genes, Immediate-Early
- Genes, fos/drug effects
- Genes, jun/drug effects
- Hypertrophy
- Kinetics
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Platelet-Derived Growth Factor/pharmacology
- Protein Biosynthesis
- Protein Kinase C/metabolism
- Pulmonary Artery/cytology
- Pulmonary Artery/drug effects
- Pulmonary Artery/metabolism
- RNA, Messenger/biosynthesis
- Rats
- Sodium/pharmacology
- Sodium-Hydrogen Exchangers/metabolism
- Thrombin/pharmacology
- Transcription, Genetic/drug effects
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Agonist-selective regulation of polyphosphoinositide metabolism in pulmonary artery smooth muscle cells. J Biol Chem 1994; 269:6390-8. [PMID: 7509802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Using a rat pulmonary artery smooth muscle cell line (PAC1), detailed analysis of polyphosphoinositide (PPI) metabolism reveals receptor type-selective patterns in the formation of inositol phosphates and 3-hydroxyphosphorylated PPIs. Responses to several agonists that stimulate hypertrophy or proliferation were examined, and distinct categories of response profile were observed. Thrombin and angiotensin II stimulated the hydrolysis of phosphatidylinositol (PI) 4,5-bisphosphate and the formation of several cytosolic species of inositol phosphates without the activation of PI 3-hydroxykinase. The response to thrombin was distinctive because a very large production of inositol 1,4-bisphosphate was accompanied by hydrolysis of PI 4-phosphate. The response to platelet-derived growth factor (PDGF) was distinguished by the production of the PI 3-hydroxykinase product, PI 3,4,5-trisphosphate, and the appearance of PI 3-hydroxykinase activity in immunoprecipitates. PDGF treatment of PAC1 cultures did not produce accumulation of detectable amounts of inositol 1,4,5-trisphosphate, although a small sustained elevation in the level of inositol monophosphate and a gradual accumulation of inositol 1,3,4-trisphosphate were observed. Characterization of these distinctive responses permitted us to correlate agonist-regulated PPI metabolism with induction of immediate-early genes and stimulation of hypertrophy or proliferation of PAC1 cultures (Rothman, A., Wolner, B., Button, D., and Taylor, P. (1994) J. Biol. Chem. 269, 6399-6404). Thrombin-stimulated PPI turnover and the production of a high level of inositol bisphosphate may be early signals linked to the induction of fosB and PAC1 cell hypertrophy, whereas the activation of PI 3-hydroxykinase and the accumulation of PI 3,4,5-trisphosphate in response to PDGF appear to be associated with mitogenesis.
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Agonist-selective regulation of polyphosphoinositide metabolism in pulmonary artery smooth muscle cells. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)37384-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Abstract
Mammalian cells that stably express jellyfish aequorin have been used to report activation of Ca2+ mobilization by cell-surface receptors. Expression of aequorin cDNA (pAEQ) was driven by the cytomegalovirus (CMV) promoter in CHO-K1 and 293 cells. Clonal isolates were obtained which express high levels of apo-aequorin protein, the Ca(2+)-dependent luminescence of which is generated by treatment of living cells with the coelenterate luciferin, coelenterazine. Transient expression of aequorin in COS cells results in even greater abundance of luminescent protein. Aequorin protein is lost from digitonin-permeabilized cells to the same extent and at the same rate as lactate dehydrogenase (LDH), indicating cytosolic location of the indicator. Aequorin expressing cells treated with agonists of endogenous receptors were used in luminescence measurements to demonstrate that the reporter lines offer a highly sensitive and robust means of assaying changes in the concentration of cytosolic Ca2+ ion. Transient co-expression of the substance P receptor in aequorin reporter cells was also performed to demonstrate the feasibility of using this convenient and sensitive assay system for large scale screening of ligands that activate cell surface receptors coupled to increases in intracellular Ca2+.
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Phase II trial of the novel sulphonylurea sulofenur in advanced breast cancer. Cancer Chemother Pharmacol 1993; 31:419-22. [PMID: 8431978 DOI: 10.1007/bf00686159] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A total of 18 women with advanced breast cancer were treated with sulofenur [LY186641; N-(5-indanylsulfonyl)-N'-(4-chlorophenyl)-urea], a diarylsulfonylurea that has broad-spectrum activity against a number of murine mammary tumour xenografts. The dosage chosen on the basis of pre-clinical and phase I studies was 700 mg/m2 given orally once daily for 14 days, with treatments being repeated every 3 weeks. There was no response. All patients experienced at least grade 1 anaemia, and two patients developed symptomatic methaemoglobinaemia. Two patients developed grade 4 rises in serum liver-function values along with histological changes consistent with drug-induced toxicity. The mean plasma concentrations of 176 micrograms/ml were lower than the levels required to exert anti-tumour effect in the mouse model.
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Abstract
Lonidamine is a substituted indazole carboxylic acid with a unique mechanism of action and early clinical studies have reported anti-tumour activity. In a phase II study 32 patients with previously treated advanced breast cancer were given Lonidamine in a daily divided oral dose of 600 mg. Of 28 patients evaluable for response, three (11%) achieved a partial response (4-24+ months) and three (11%) a minor response. Two patients have stable disease (greater than 3 months) and 20 progressed. Toxicity was very mild. Sixteen (53%) of 31 patients had myalgia which lasted a median of 2 weeks. This was investigated with nuclear magnetic resonance spectroscopy in four patients but the changes were unrelated to the degree of myalgia. No other major side-effect was seen, and no dose reduction was required. Lonidamine pharmacokinetics have been investigated in 17 patients 1 month after the start of therapy. Lonidamine was detected in the plasma of all patients, but there was no clear relationship between Lonidamine levels and clinical response or toxicity. Lonidamine appears to be active against advanced breast cancer and its low toxicity would allow combination studies with chemotherapy.
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The pharmacokinetics of oral lonidamine in breast and lung cancer patients. Semin Oncol 1991; 18:11-7. [PMID: 2031191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The plasma levels of lonidamine have been studied in 24 breast or lung cancer patients as part of the Phase II evaluation of the drug. The pharmacokinetic studies were performed when the patients had been on oral lonidamine therapy for 27 to 47 days (mean 32 days) and the studies were conducted over a 24 hour period. Lonidamine was administered in three divided doses of 150 mg (t = 0h), 150 mg (t = 7h), and 150 mg or 300 mg (t = 14h). Plasma levels of lonidamine were determined by high-performance liquid chromatography (HPLC) with fluorescence detection. Lonidamine was detected in the plasma of all patients studied, and the absolute range for the peak plasma levels of the drug following the first and second doses were 4.6-33.8 and 4.8-33.3 micrograms/ml, respectively. The range of times after administration at which the peak occurred was 0.5 to 4.2 hours for the first dose and 0.5 to 4.1 hours for the second. The absolute range for the trough levels observed over the 24-hour study period was 1.0 to 12.6 micrograms/ml and in 19 of the patients it was possible to define the apparent half life of lonidamine that was found to be within the range 2.5 to 11.7 hours. In addition to lonidamine, a number of fluorescent components were detected in the plasma of patients following lonidamine treatment that were not detected in pretreatment plasma samples. One component, a compound that eluted from the HPLC more rapidly than lonidamine, was found in some patients to be sensitive to hydrolysis with beta-glucuronidase. Comparison of the pharmacokinetic data with patient characteristics and clinical biochemistry results failed to establish any clear relationship. Similarly there was no relationship between lonidamine pharmacokinetics and either drug-induced myalgia or testicular pain. Insufficient responses were seen in the patient group studied to allow the relationship between lonidamine pharmacokinetics and response to be evaluated.
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Quest. A chance wasted? NURSING TIMES 1988; 84:69-71. [PMID: 3194251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Abstract
Scanning laser densitometry was performed on immuno- and dot blots developed on nitrocellulose by treatment of the nitrocellulose with xylene. This method permits the development of simple methods for recording results of immunoblots and of producing semi-quantitative assays from dot blots.
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Regulation of ligand-receptor dynamics by guanine nucleotides. Real-time analysis of interconverting states for the neutrophil formyl peptide receptor. J Biol Chem 1987; 262:135-9. [PMID: 3098737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Intact neutrophils exhibit interconverting active and inactive receptor states with half-times for dissociation of 10 s and 2 min, respectively. We examined the effect of guanine nucleotides on ligand-receptor dynamics at 37 degrees C in neutrophils permeabilized with digitonin using continuous fluorometric measurements. The permeabilized cells exhibit a single class of slowly dissociating receptors with a half-time similar to the inactive state. The slowly dissociating state is lengthened in the presence of 10 mM by Mg2+ about two-fold but is relatively insensitive to substitutions of Na+ or K+. When guanine nucleotide is added the receptors dissociate uniformly with a half-time similar to the active state but are sensitive to the substitution of Na+ or K+ (K+ or K+/Mg2+ approximately 10 s; Na+ or Na+/Mg2+ approximately 4 s). When receptors in permeabilized cells are ADP-ribosylated with pertussis toxin the rapidly dissociating state is detected. In the presence of nonsaturating nucleotide or incomplete ribosylation, complex rates of ligand dissociation intermediate between the active and inactive forms are observed. Micromolar concentrations of Ca2+ block the effect of guanine nucleotide on the receptor. The relationships between ligand-receptor dynamics in intact neutrophils and interconverting states regulated by guanine nucleotides and ions in permeabilized cells are discussed.
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Teichoic acids and lipids associated with the membrane of a Bacillus licheniformis mutant and the membrane lipids of the parental strain. J Bacteriol 1976; 128:149-56. [PMID: 977537 PMCID: PMC232837 DOI: 10.1128/jb.128.1.149-156.1976] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Bacillus licheniformis 6346 MH-1 and a phosphoglucomutase-deficient poorly lytic mutant, B. licheniformis 6346 MH-5, both contain cardiolipin, phosphatidyl ethanolamine, and phosphatidyl glycerol but are devoid of phosphoglycolipids. Gentiobiosyl diglyceride is present in the parent organism but glycolipids are absent from the mutant. Lipoteichoic acid was extracted from the whole cells of MH-5 with hot aqueous phenol and contained fatty acids, glucosamine, and 1,3-polyglycerol phosphate. The fatty acids were predominantly of the branched-chain type and were esterified to hydroxyl groups of a terminal glycerol residue. The polyglycerol phosphate chains contained, on average, 32 to 40 glycerol residues, some of which were substituted at the secondary hydroxyl group with alpha-N-acylglucosaminyl residues. Phenol extraction of the supernatant fluid that remained when walls were removed from preparations of disrupted cells of MH-5 yielded membrane teichoic acid, which consisted of substituted polyglycerol phosphate but was devoid of fatty acids.
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Lipoteichoic acid from Bacillus licheniformis 6346 MH-1. Comparative studies on the lipid portion of the lipoteichoic acid and the membrane glycolipid. Biochemistry 1976; 15:989-95. [PMID: 1252437 DOI: 10.1021/bi00650a007] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A lipoteichoic acid and a membrane glycolipid were isolated from Bacillus licheniformis 6346 MH-1. The fatty acid composition of the two preparations were similar. Most of the fatty acids were of the branched chain type. The glycolipid was shown to be a diacyl derivative of O-beta-D-glucopyranosyl-(1 leads to 6)-O-beta-D-glucopyranosyl-(1 leads to 3)-glycerol. The lipoteichoic acid contained lipid, polyglycerol phosphate, and glucosamine. The lipid was released by treatment with hydrofluoric acid and by hydrolysis in dilute acid and was shown to have a structure identical with that of the membrane glycolipid.
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Abstract
1. The teichoic acid from walls of Staphylococcus lactis I3 was isolated by extraction with trichloroacetic acid and shown to contain glycerol, N-acetylglucosamine, phosphate and d-alanine in the molecular proportions 1:1:2:1. The alanine is attached to the polymer through ester linkages. 2. Hydrolysis with acid gave alanine, glucosamine and glycerol diphosphates. Under mild acid conditions a repeating unit was produced; this consists of glycerol diphosphate joined through a phosphodiester group to N-acetylglucosamine. 3. Hydrolysis with alkali gave glycerol diphosphates, saccharinic acid and two phosphodiesters containing glucosamine whose structures were elucidated; these both contain glucosamine 1-phosphate, and N-acetylglucosamine 1-phosphate was isolated by a degradative procedure. 4. The unusual properties of the teichoic acid are explained by a polymeric structure in which N-acetylglucosamine 1-phosphate is attached through its phosphate to glycerol phosphate. 5. The biosynthetic implications of this structure are discussed.
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Abstract
1. Teichoic acid was isolated by extraction with trichloroacetic acid of the membrane fraction of disrupted cells of Staphylococcus lactis I3. 2. The purified material contains glycerol, phosphate and alanine, but little or no sugar or amino sugar. 3. A study of the products of hydrolysis with acid and alkali established that the membrane teichoic acid is a (1-->3)-linked poly(glycerol phosphate) that differs in structure from the glycerol teichoic acid in the wall of this organism. 4. The alanine ester residues show the characteristic high lability to alkali and are thus distinguishable from the more stable alanine ester residues of the wall teichoic acid. 5. The significance of these structural features and the possible function of teichoic acids are discussed.
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50
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The linkage between teichoic acid and glycosaminopeptide in the walls of a strain of Staphylococcus lactis. Biochem J 1966; 99:11C-14C. [PMID: 5947143 PMCID: PMC1265022 DOI: 10.1042/bj0990011c] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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