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Stanley S, Hansel J. Comment on 'Potential interaction between exogenous anabolic steroids and sugammadex: failed reversal of rocuronium in a patient taking testosterone and trestolone acetate'. Anaesth Rep 2024; 12:e12280. [PMID: 38250051 PMCID: PMC10799306 DOI: 10.1002/anr3.12280] [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] [Accepted: 01/09/2024] [Indexed: 01/23/2024] Open
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Roberts B, Cooper Z, Lu S, Stanley S, Majda BT, Collins KRL, Gilkes L, Rodger J, Akkari PA, Hood SD. Utility of pharmacogenetic testing to optimise antidepressant pharmacotherapy in youth: a narrative literature review. Front Pharmacol 2023; 14:1267294. [PMID: 37795032 PMCID: PMC10545970 DOI: 10.3389/fphar.2023.1267294] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 08/30/2023] [Indexed: 10/06/2023] Open
Abstract
Pharmacogenetics (PGx) is the study and application of how interindividual differences in our genomes can influence drug responses. By evaluating individuals' genetic variability in genes related to drug metabolism, PGx testing has the capabilities to individualise primary care and build a safer drug prescription model than the current "one-size-fits-all" approach. In particular, the use of PGx testing in psychiatry has shown promising evidence in improving drug efficacy as well as reducing toxicity and adverse drug reactions. Despite randomised controlled trials demonstrating an evidence base for its use, there are still numerous barriers impeding its implementation. This review paper will discuss the management of mental health conditions with PGx-guided treatment with a strong focus on youth mental illness. PGx testing in clinical practice, the concerns for its implementation in youth psychiatry, and some of the barriers inhibiting its integration in clinical healthcare will also be discussed. Overall, this paper provides a comprehensive review of the current state of knowledge and application for PGx in psychiatry and summarises the capabilities of genetic information to personalising medicine for the treatment of mental ill-health in youth.
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Affiliation(s)
- Bradley Roberts
- The Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia
- School of Biological Sciences, University of Western Australia, Crawley, WA, Australia
| | - Zahra Cooper
- The Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia
| | - Stephanie Lu
- School of Psychological Science, University of Western Australia, Crawley, WA, Australia
| | - Susanne Stanley
- Division of Psychiatry, School of Medicine, University of Western Australia, Crawley, WA, Australia
| | | | - Khan R. L. Collins
- Western Australian Department of Health, North Metropolitan Health Service, Perth, WA, Australia
| | - Lucy Gilkes
- School of Medicine, University of Notre Dame, Fremantle, WA, Australia
- Divison of General Practice, School of Medicine, University of Western Australia, Crawley, WA, Australia
| | - Jennifer Rodger
- The Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia
- School of Biological Sciences, University of Western Australia, Crawley, WA, Australia
| | - P. Anthony Akkari
- The Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia
- School of Human Sciences, University of Western Australia, Crawley, WA, Australia
- Centre for Molecular Medicine and Innovative Therapeutics, Murdoch University, Murdoch, WA, Australia
- Division of Neurology, Duke University Medical Centre, Duke University, Durham, United States
| | - Sean D. Hood
- Division of Psychiatry, School of Medicine, University of Western Australia, Crawley, WA, Australia
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Newnham EA, Mergelsberg ELP, Tearne J, McEvoy P, Stanley S, Celenza A, Kavanagh H, Stevenson T, Mavaddat N, Demore G, Hood S. Mental Health Status, Risk and Protective Factors for Healthcare Staff Prior to the First Major COVID-19 Outbreak in Western Australia. Int J Public Health 2023; 68:1606102. [PMID: 37732330 PMCID: PMC10507727 DOI: 10.3389/ijph.2023.1606102] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 08/16/2023] [Indexed: 09/22/2023] Open
Abstract
Objectives: Western Australia's unique public health response delayed the first wave of community COVID-19 transmission for 2 years. We aimed to determine the status of post-traumatic stress (PTSS), depressive, and anxiety symptoms among healthcare staff in major tertiary hospitals, together with associated risk and protective factors prior to the first substantial outbreak of COVID-19. Methods: A cross-sectional study was conducted with 431 healthcare staff immediately prior to the Western Australian border re-opening in 2022. Staff were recruited via notices in email newsletters, at four tertiary hospitals and a public mental health clinic in metropolitan Perth. Validated and original questionnaires were administered via Qualtrics. Results: Moderate levels of PTSS (22.3%), depression (21.9%), and anxiety (25.9%) were reported. Pathway analyses indicated that sleep difficulties, workplace stressors, and infectious disease training were associated with higher PTSS, depression and anxiety symptoms, and younger age was associated with higher levels of depression and anxiety. Nursing roles were associated with higher PTSS. Social support and workplace support were associated with lower levels of depression and anxiety but were not associated with PTSS. Conclusion: The findings illustrate high levels of resilience, but indicate a need for structural supports within the health system to foster staff mental health prior to the onset of emergencies.
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Affiliation(s)
- Elizabeth A. Newnham
- School of Population Health, Curtin University, Perth, WA, Australia
- Curtin enAble Institute, Perth, WA, Australia
- François-Xavier Bagnoud Center for Health and Human Rights, Harvard T.H. Chan School of Public Health, Boston, MA, United States
| | | | - Jessica Tearne
- Department of Clinical Psychology and Clinical Neuropsychology, Fiona Stanley Hospital, Perth, WA, Australia
- State Major Trauma Unit, Royal Perth Hospital, Perth, WA, Australia
| | - Peter McEvoy
- School of Population Health, Curtin University, Perth, WA, Australia
- Curtin enAble Institute, Perth, WA, Australia
- Centre for Clinical Interventions, North Metropolitan Health Service, Perth, WA, Australia
| | - Susanne Stanley
- Division of Psychiatry, School of Medicine, The University of Western Australia, Perth, WA, Australia
| | - Antonio Celenza
- Emergency Medicine, School of Medicine, University of Western Australia, Perth, WA, Australia
- Emergency Department, Sir Charles Gairdner Hospital, Perth, WA, Australia
| | - Hyranthi Kavanagh
- Department of Clinical Psychology and Clinical Neuropsychology, Fiona Stanley Hospital, Perth, WA, Australia
| | - Teresa Stevenson
- Peel and Rockingham Kwinana Mental Health Service, Rockingham, WA, Australia
| | - Nahal Mavaddat
- Discipline of General Practice, School of Medicine, University of Western Australia, Perth, WA, Australia
| | - Gavin Demore
- Emergency Medicine, School of Medicine, University of Western Australia, Perth, WA, Australia
- Western Australia Country Health Service, Perth, WA, Australia
| | - Sean Hood
- Division of Psychiatry, School of Medicine, The University of Western Australia, Perth, WA, Australia
- Sir Charles Gairdner Hospital Mental Health Unit, North Metropolitan Health Service Mental Health, Public Health and Dental Services (MHPHDS), Perth, WA, Australia
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John AP, Stanley S, Haywood D. Rates and Reasons for Clozapine Treatment Interruptions: Impact of the Frequency of Hematologic Monitoring and Cardiac Adverse Events. J Clin Psychopharmacol 2023; 43:233-238. [PMID: 37126829 DOI: 10.1097/jcp.0000000000001673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
BACKGROUND Differing rates and reasons for interruptions of clozapine treatment have been reported globally. This article evaluated the rates and reasons for clozapine therapy interruptions in Australia and explored the impact of the frequency of hematological monitoring on these parameters. METHODS Data of the patients who were newly commenced on clozapine at three metropolitan public mental health services in Western Australia over 11 years were retrospectively collated. The rate and reasons for clozapine therapy interruptions and their association with the frequency of hematological monitoring, age, sex, and treatment site were analyzed using parametric, nonparametric, and correlational analyses. RESULTS Of the 457 patients whose data were collected, 69.6% had an interruption of treatment with 41.2% of those occurring during the period of mandatory weekly hematological monitoring in the first 18 weeks. Nonadherence (57.4%) and adverse effects (28.8%) were the 2 main reasons for the treatment interruptions. Cardiac issues accounted for the majority of the interruptions (61.8%) due to specified adverse effects, and these occurred significantly more commonly within the first 18 weeks. Location, age, and sex did not predict the possibility of treatment interruptions. CONCLUSIONS The high rates of clozapine treatment interruption observed during the period of weekly monitoring point toward the need to address the burden of frequent hematological monitoring for patients. Disproportionately higher rates of interruption due to cardiac adverse effects observed in this study compared with research from non-Australian settings raise the possibility of geographical differences in the adverse effects leading to treatment discontinuation.
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Tyrrell‐Marsh I, Stanley S. Neurological injury after cardiac arrest - setting a case of prolonged re-warming into a developing research context. Anaesth Rep 2023; 11:e12234. [PMID: 37323807 PMCID: PMC10267611 DOI: 10.1002/anr3.12234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2023] [Indexed: 06/17/2023] Open
Affiliation(s)
- I. Tyrrell‐Marsh
- Department of Critical CareManchester Royal InfirmaryManchesterUK
| | - S. Stanley
- North West School of AnaesthesiaManchesterUK
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John AP, Burrows S, Stanley S, Acabo C, Shymko G, Jaworska A, Velayudhan A. Demographic and clinical characteristics of patients who recommence clozapine following therapy interruptions. Acta Psychiatr Scand 2022; 145:293-300. [PMID: 34963015 DOI: 10.1111/acps.13394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 12/15/2021] [Accepted: 12/18/2021] [Indexed: 11/26/2022]
Abstract
OBJECTIVE The proportion of patients who recommence clozapine after cessation, the time taken to resume clozapine post-cessation, and distinguishing demographic and clinical characteristics of this group have been poorly researched. We evaluated these in the current study. METHOD We retrospectively extracted selected demographic and clinical variables and clozapine treatment interruption and recommencement data up to December 2018 of a cohort of 458 patients who first commenced clozapine between 2006 and 2016. The study was conducted at three Australian health services. RESULTS Of the 310 (69%) patients who had at least one interruption of clozapine treatment, 170 (54.8%) did not resume clozapine, and 140 (45.2%) recommenced it after the first interruption. More than half of those who recommenced did so within a month and 80% by 12 months. Cox regression analysis revealed that age was significantly associated with recommencement, with a 2% decrease in the likelihood of restarting after an interruption for each year later that clozapine was initially commenced (HR = 0.98 95%CI: 0.97, 0.997, p = 0.02). Those who ceased clozapine due to adverse effects were less likely to restart than those who ceased due to noncompliance (HR = 0.63 95%CI: 0.41, 0.97, p = 0.03). More time on clozapine prior to interruption increased the likelihood of restarting it, with each additional month on clozapine increasing this likelihood by 1% (HR = 1.01 95%CI: 1.01, 1.02, p < 0.001). CONCLUSION If the distinguishing demographic and clinical characteristics of the group identified in this study are corroborated through further research, this could further validate the need to identify treatment resistance and commence clozapine early in people with schizophrenia and provide appropriate interventions to those more at risk of permanent discontinuation of clozapine.
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Affiliation(s)
- Alexander Panickacheril John
- Bentley Health Service, Perth, Western Australia, Australia.,University of Western Australia, Perth, Western Australia, Australia
| | - Sally Burrows
- University of Western Australia, Perth, Western Australia, Australia.,Royal Perth Hospital Research Foundation, Perth, Western Australia, Australia
| | - Susanne Stanley
- University of Western Australia, Perth, Western Australia, Australia
| | - Cherry Acabo
- Bentley Health Service, Perth, Western Australia, Australia
| | - Gordon Shymko
- Peel and Rockingham Kwinana Health Service, Cooloongup, South Australia, Australia
| | | | - Ajay Velayudhan
- Fremantle Hospital Health Service, Palmyra DC, Western Australia, Australia
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Gleason AE, Rittman DR, Bolme CA, Galtier E, Lee HJ, Granados E, Ali S, Lazicki A, Swift D, Celliers P, Militzer B, Stanley S, Mao WL. Dynamic compression of water to conditions in ice giant interiors. Sci Rep 2022; 12:715. [PMID: 35027608 PMCID: PMC8758754 DOI: 10.1038/s41598-021-04687-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 12/22/2021] [Indexed: 11/26/2022] Open
Abstract
Recent discoveries of water-rich Neptune-like exoplanets require a more detailed understanding of the phase diagram of H2O at pressure–temperature conditions relevant to their planetary interiors. The unusual non-dipolar magnetic fields of ice giant planets, produced by convecting liquid ionic water, are influenced by exotic high-pressure states of H2O—yet the structure of ice in this state is challenging to determine experimentally. Here we present X-ray diffraction evidence of a body-centered cubic (BCC) structured H2O ice at 200 GPa and ~ 5000 K, deemed ice XIX, using the X-ray Free Electron Laser of the Linac Coherent Light Source to probe the structure of the oxygen sub-lattice during dynamic compression. Although several cubic or orthorhombic structures have been predicted to be the stable structure at these conditions, we show this BCC ice phase is stable to multi-Mbar pressures and temperatures near the melt boundary. This suggests variable and increased electrical conductivity to greater depths in ice giant planets that may promote the generation of multipolar magnetic fields.
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Affiliation(s)
- A E Gleason
- Fundamental Physics Directorate, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA. .,Geological Sciences, Stanford University, Stanford, CA, 94305, USA.
| | - D R Rittman
- Geological Sciences, Stanford University, Stanford, CA, 94305, USA
| | - C A Bolme
- Shock and Detonation Physics, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - E Galtier
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - H J Lee
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - E Granados
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - S Ali
- Shock Physics, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - A Lazicki
- Shock Physics, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - D Swift
- Shock Physics, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - P Celliers
- Shock Physics, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - B Militzer
- Earth and Planetary Science, University of California, Berkeley, CA, 94720, USA
| | - S Stanley
- Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD, 21218, USA.,Applied Physics Lab, Johns Hopkins University, Laurel, MD, 20723, USA
| | - W L Mao
- Geological Sciences, Stanford University, Stanford, CA, 94305, USA
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Abstract
The Voyager 2 flybys of Uranus and Neptune revealed the first multipolar planetary magnetic fields and highlighted how much we have yet to learn about ice giant planets. In this review, we summarize observations of Uranus' and Neptune's magnetic fields and place them in the context of other planetary dynamos. The ingredients for dynamo action in general, and for the ice giants in particular, are discussed, as are the factors thought to control magnetic field strength and morphology. These ideas are then applied to Uranus and Neptune, where we show that no models are yet able to fully explain their observed magnetic fields. We then propose future directions for missions, modelling, experiments and theory necessary to answer outstanding questions about the dynamos of ice giant planets, both within our solar system and beyond. This article is part of a discussion meeting issue 'Future exploration of ice giant systems'.
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Affiliation(s)
- K. M. Soderlund
- Institute for Geophysics, John A. and Katherine G. Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, USA
| | - S. Stanley
- Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, MD, USA
- The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
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Davies E, Wieboldt J, Stanley T, Maeda Y, Smyth M, Stanley S, Mcclean M, Evans W, Funston C, Millar BC, Goldsmith CE, Moore JE. Isolation and identification of ‘Mycobacterium angelicum’ from a patient with type II respiratory failure: suggested reporting guidelines to molecular clinical laboratories. Br J Biomed Sci 2019. [DOI: 10.1080/09674845.2012.12069140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- E. Davies
- Departments of Microbiology, Causeway Hospital, Coleraine, Co. Londonderry
| | - J. Wieboldt
- Departments of Respiratory Medicine, Causeway Hospital, Coleraine, Co. Londonderry
| | - T. Stanley
- Northern Ireland Mycobacterium Reference Laboratory, Department of Medical Microbiology, Royal Group of Hospitals
| | - Y. Maeda
- Northern Ireland Public Health Laboratory, Department of Bacteriology, Belfast City Hospital
| | - M. Smyth
- Northern Ireland Mycobacterium Reference Laboratory, Department of Medical Microbiology, Royal Group of Hospitals
| | - S. Stanley
- Northern Ireland Mycobacterium Reference Laboratory, Department of Medical Microbiology, Royal Group of Hospitals
| | - M. Mcclean
- Northern Ireland Mycobacterium Reference Laboratory, Department of Medical Microbiology, Royal Group of Hospitals
| | - W. Evans
- Department of Microbiology, Antrim Area Hospital, Co. Antrim
| | - C. Funston
- Department of Microbiology, Antrim Area Hospital, Co. Antrim
| | - B. C. Millar
- Northern Ireland Public Health Laboratory, Department of Bacteriology, Belfast City Hospital
| | - C. E. Goldsmith
- Northern Ireland Public Health Laboratory, Department of Bacteriology, Belfast City Hospital
| | - J. E. Moore
- Northern Ireland Public Health Laboratory, Department of Bacteriology, Belfast City Hospital
- School of Biomedical Sciences, University of Ulster, Coleraine, Northern Ireland, UK
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Ruebsam M, Shafraz O, Stanley S, Kowalczyk A, Niessen C, Sivasankar S. 870 E-cadherin binds desmoglein to facilitate desmosome assembly. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.881] [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: 10/17/2022]
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Pearson W, Wood K, Stanley S, MacNicol J. Exploring relationships between body condition score, body fat, activity level and inflammatory biomarkers. J Anim Physiol Anim Nutr (Berl) 2018; 102:1062-1068. [PMID: 29707811 DOI: 10.1111/jpn.12893] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 03/06/2018] [Indexed: 12/31/2022]
Abstract
Obesity is associated with inflammatory disorders in humans, including degenerative joint disease. While obesity is endemic in horses, its relationship to equine degenerative joint disease has not been explored. The current study sought to describe relationships between: body weight (BW), body condition score (BCS), lameness grade (AAEP), total body fat mass (kg; FM) and fat per cent (FP) [multifrequency bioelectrical impedance analysis (mfBIA)], age, gender, activity level (AL), synovial fluid (SF) and plasma (PL) PGE2 and glycosaminoglycan (GAG) in horses. During this field investigation, the BCS (of nine) of 54 horses at multiple farms in southern Ontario, Canada, was determined. Horses were categorized as thin (BCS=3/9; n = 6), moderate (BCS=4 or 5/9; n = 18), overweight (BCS=6 or 7/9; n = 19) or obese (BCS=8 or 9/9; n = 11). Total fat mass (kg) and body fat% was measured using mfBIA, lameness was assessed (AAEP lameness scale) and synovial fluid was collected via aseptic arthrocentesis from the left intercarpal joint for assessment of inflammatory biomarkers (PGE2 , GAG). Means were compared with a one-way ANOVA; correlation coefficients were calculated using a Spearman Rank Order Correlation to reveal correlations between variables. BCS was positively correlated with BW, FM, FP, AL and PL-PGE2 . BW was also significantly positively correlated with PL-PGE2 . It is concluded that BCS is significantly correlated with PL-PGE2 , due in part to the combined effect of AL and body condition. Net inflammatory effects of body fat on risk for joint disease require further study.
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Affiliation(s)
- W Pearson
- Department of Animal Biosciences, University of Guelph, Guelph, ON, Canada
| | - K Wood
- Department of Animal Biosciences, University of Guelph, Guelph, ON, Canada
| | - S Stanley
- The Nutraceutical Alliance, Campbellville, ON, Canada
| | - J MacNicol
- Department of Animal Biosciences, University of Guelph, Guelph, ON, Canada
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Wynn M, Legacki E, Conley A, Loux S, Esteller-Vico A, Stanley S, Squires E, Troedsson M, Ball B. 67 INHIBITION OF 5α-REDUCTASE DURING LATE GESTATION IN THE MARE. Reprod Fertil Dev 2016. [DOI: 10.1071/rdv28n2ab67] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
During the latter half of pregnancy in the mare, circulating concentrations of progesterone (P4) are low and a major bioactive progestogen, 5α-dihydroprogesterone (DHP), is present in high concentrations. DHP is formed through the activity of 5α-reductase, which converts P4 to DHP. Further metabolites of DHP have been attributed to fetal and myometrial quiescence. The purpose of this study was to examine the effects of a 5α-reductase inhibitor (dutasteride) on P4 metabolism and onset of parturition. Pregnant mares (n = 5) were treated with dutasteride (0.01 mg kg–1; IM), and control mares (n = 4) received vehicle alone from 300 to 320 days of gestation or until foaling. Serum concentrations of P4 and DHP were determined with liquid chromatography/tandem mass spectrometry (LC/MS-MS) daily for 9 days preceding parturition. Endocrine data were analysed with a random effects mixed model with time, treatment (TRT), and time × TRT interaction. Gestational data were analysed with a Wilcoxon test. Although there was a significant effect of time on P4 and DHP, there was no effect of TRT or time × TRT on these progestogens. For the ratio of DHP/P4, there were significant effects of time, TRT, and time × TRT interaction such that the ratio of DHP/P4 was greater in the control than dutasteride-treated mares. Birth weight and gestational length were not different (P > 0.2) between the dutasteride-treated and control mares, although placental weights were greater (P < 0.05) in dutasteride-treated mares. Because the ratio of DHP/P4 was suppressed in dutasteride-treated mares, it appears that dutasteride was active in late gestational mares. Although gestational length and neonatal weights were not different between groups, placentas from dutasteride-treated mares were heavier than those from control mares. The reason for the increase in placental weights was not determined.
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Affiliation(s)
- Steven Brooks
- Physiology/Pharmacology West Virginia UniversityMorgantownWVUnited States
| | - S Stanley
- Physiology/Pharmacology West Virginia UniversityMorgantownWVUnited States
| | - C Leon
- Physiology/Pharmacology West Virginia UniversityMorgantownWVUnited States
| | - A d'Audiffret
- Physiology/Pharmacology West Virginia UniversityMorgantownWVUnited States
| | - J Frisbee
- Physiology/Pharmacology West Virginia UniversityMorgantownWVUnited States
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Mellett Keith AM, Bruyette D, Stanley S. Trilostane therapy for treatment of spontaneous hyperadrenocorticism in cats: 15 cases (2004-2012). J Vet Intern Med 2013; 27:1471-7. [PMID: 24011349 DOI: 10.1111/jvim.12178] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Revised: 06/16/2013] [Accepted: 07/29/2013] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Medical treatment with trilostane improves clinical signs, causes unclear insulin requirement changes, and variable survival times in cats. OBJECTIVES/HYPOTHESIS To characterize the long-term efficacy of trilostane in treating cats with hyperadrenocorticism (HAC). ANIMALS Fifteen client-owned cats with spontaneous HAC. METHODS Multicenter descriptive retrospective study with a search performed on all medical records for cats diagnosed with spontaneous HAC. RESULTS Clinical signs (13 of 15 cats) and ACTH stimulation testing results (13 of 15) improved with trilostane therapy. Diabetes mellitus was reported in 9/15 cases. Insulin requirements decreased by 36% within 2 months in 6/9 diabetic cats. Median survival time was 617 days for all cats (range 80-1,278 days). Complications included weight loss, urinary tract infections, chronic kidney disease, seizures, and recurrent pancreatitis. Hypocortisolemia was documented in 1 case. Cause of death occurred as a result of nonadrenal or nondiabetic illnesses (renal failure, seizures [caused by hypoglycemia or unknown]), or lymphoma. CONCLUSIONS AND CLINICAL IMPORTANCE Trilostane ameliorates clinical signs of HAC in cats, is tolerated well in the long term, and can lead to improved regulation of diabetes.
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Affiliation(s)
- A M Mellett Keith
- Section of Internal Medicine, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA
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15
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Aleman M, Pickles KJ, Conley AJ, Stanley S, Haggett E, Toth B, Madigan JE. Abnormal plasma neuroactive progestagen derivatives in ill, neonatal foals presented to the neonatal intensive care unit. Equine Vet J 2013; 45:661-5. [PMID: 23600660 DOI: 10.1111/evj.12065] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [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: 03/16/2011] [Accepted: 01/18/2013] [Indexed: 11/28/2022]
Abstract
REASONS FOR PERFORMING THE STUDY Increased levels of pregnanes have been reported in foals with neonatal maladjustment syndrome (NMS). These steroids may cross the blood-brain barrier and have depressive effects in the central nervous system leading to behavioural abnormalities and altered states of consciousness in affected foals. OBJECTIVES The aim of this study was to determine the pregnane profile of foals with NMS and compare it with that of healthy controls and sick, non-NMS foals. STUDY DESIGN Prospective-clinical study. METHODS Thirty-two foals with a clinical diagnosis of NMS, 12 foals with other neonatal disorders and 10 healthy control foals were selected for the study. Heparinised blood samples were collected from each group of foals and pregnane and androgen concentrations determined using liquid chromatography mass spectrometry at 0, 24 and 48 h of age. RESULTS Healthy foals showed a significant decrease in pregnane concentrations over the first 48 h of life (P<0.01). Foals with NMS and sick, non-NMS foals had significantly increased progesterone, pregnenolone, androstenedione, dehydroepiandrosterone and epitestosterone concentrations compared with healthy foals (P<0.05). Progesterone and pregnenolone concentrations of sick, non-NMS foals decreased significantly over 48 h (P<0.05), whereas concentrations in NMS foals remained increased. CONCLUSIONS AND POTENTIAL RELEVANCE Pregnane concentrations of ill, neonatal foals remain increased following birth, reflecting a delayed, or interrupted, transition from intra- to extra-uterine life. Serial progesterone and pregnenolone measurement may be useful in aiding diagnosis of NMS.
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Affiliation(s)
- M Aleman
- Department of Medicine and Epidemiology, School of Veterinary Medicine University of California, USA
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Stanley S, Laugharne J. The Impact of Lifestyle Factors on the Physical Health of People with a Mental Illness: a Brief Review. Int J Behav Med 2013; 21:275-81. [DOI: 10.1007/s12529-013-9298-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Madigan JE, Haggettt EF, Pickles KJ, Conley A, Stanley S, Moeller B, Toth B, Aleman M. Allopregnanolone infusion induced neurobehavioural alterations in a neonatal foal: is this a clue to the pathogenesis of neonatal maladjustment syndrome? Equine Vet J 2012:109-12. [PMID: 22594038 DOI: 10.1111/j.2042-3306.2011.00504.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
REASONS FOR PERFORMING THE STUDY Increased plasma progestagen concentrations have been reported in foals with neonatal maladjustment syndrome (NMS). These steroids may cross the blood-brain barrier and have dampening effects in the central nervous system. OBJECTIVES To evaluate if the infusion of a progesterone derivative (allopregnanolone) in a healthy neonatal foal would induce clinical signs compatible with NMS. METHODS A healthy neonatal foal from a healthy mare with a normal gestation (length, no complications), birth and placenta was infused with allopregnanolone to observe its neurobehavioural effects. Heparinised blood samples were collected pre- and post infusion to determine various progestagen concentrations using liquid chromatography mass spectrometry. A second healthy neonatal foal was infused with ethanol and saline for comparison of clinical observations. RESULTS Infusion of allopregnanolone resulted in obtundation, lack of affinity for the mare and decreased response to external stimuli. These effects were short-lasting and associated with measurable concentrations of progestagens. CONCLUSIONS AND POTENTIAL RELEVANCE Infusion of a steroid metabolite to a healthy neonatal foal resulted in neurobehavioural alterations compatible with those observed in foals with NMS. These findings suggest that increased progestagen concentrations may be responsible for some of the behavioural changes observed in foals with NMS.
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Affiliation(s)
- J E Madigan
- Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, USA
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Zucker ML, Hagedorn CH, Murphy CA, Stanley S, Reid KJ, Skikne BS. Mechanism of thrombocytopenia in chronic hepatitis C as evaluated by the immature platelet fraction. Int J Lab Hematol 2012; 34:525-32. [PMID: 22708981 DOI: 10.1111/j.1751-553x.2012.01429.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
INTRODUCTION Thrombocytopenia occurs frequently in chronic hepatitis C. The mechanism of this association was investigated utilizing the immature platelet fraction (IPF%) as an index of platelet production together with assay of thrombopoietin (TPO). METHODS In a cross-sectional study, 47 patients with chronic hepatitis C were studied, 29 with thrombocytopenia and 18 without thrombocytopenia (six patients in each group were on interferon therapy). RESULTS IPF% was elevated in the thrombocytopenic compared with the nonthrombocytopenic group (9.0 ± 4.8% vs. 4.7 ± 2.4%, P < 0.001), and an increase in IPF% was significantly associated with thrombocytopenia on multivariable analysis (P < 0.05). Splenomegaly was more common in thrombocytopenic than in nonthrombocytopenic subjects (66% vs. 6%, P < 0.001), and on multivariable analysis, splenomegaly was the factor associated with the highest relative risk of thrombocytopenia (RR = 1.9, P < 0.05). IPF% values were elevated in a similar proportion of thrombocytopenic patients with and without splenomegaly (58% and 60%, respectively). There was no difference in TPO levels between thrombocytopenic and nonthrombocytopenic patients, and TPO levels were not related to the risk of thrombocytopenia on multivariable analysis. Significantly more thrombocytopenic than nonthrombocytopenic subjects had abnormal liver function tests, cirrhosis, and portal hypertension, and a decrease in serum albumin was significantly associated with thrombocytopenia (P < 0.005) on multivariable analysis. CONCLUSIONS Factors associated with liver disease in general are associated with thrombocytopenia in chronic hepatitis C. Peripheral platelet destruction or sequestration is the major mechanism for thrombocytopenia, with hypersplenism being an important cause. Low TPO levels were not related to the occurrence of thrombocytopenia in this study.
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Affiliation(s)
- M L Zucker
- Department of Pathology, Kansas University Medical Center, Kansas City, KS, USA.
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Davies E, Wieboldt J, Stanley T, Maeda Y, Smyth M, Stanley S, McClean M, Evans W, Funston C, Millar BC, Goldsmith CE, Moore JE. Isolation and identification of 'Mycobacterium angelicum' from a patient with type II respiratory failure: suggested reporting guidelines to molecular clinical laboratories. Br J Biomed Sci 2012; 69:134-136. [PMID: 23057162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Affiliation(s)
- E Davies
- Department of Microbiology, Causeway Hospital, Coleraine, Co. Londonderry, Northern Ireland, UK
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Laugharne J, Appiah-Poku J, Laugharne R, Stanley S. Fostering psychiatry in Ghana: the impact of a short review course through an international collaboration. Acad Psychiatry 2011; 35:373-375. [PMID: 22193734 DOI: 10.1176/appi.ap.35.6.373] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
OBJECTIVE The aim of the current study was to evaluate a short review course in psychiatry conducted at the Kwame Nkrumah University of Science and Technology medical school and any change in student interest in a career in psychiatry. METHOD Students were asked to complete a general psychiatric knowledge questionnaire before and immediately after the course. They were also asked to rate their attitude toward psychiatry as a career. The same questionnaire was readministered 1 month later. RESULTS The average results on the knowledge test pre-course was 52% (N=129) and post-course was 78% (N=122), constituting a 50% increase in knowledge for the average student. The proportion of students showing considerable interest in a psychiatric career increased from 19% pre-course to 32% post-course. At 1-month follow-up, the average result for the knowledge test was 76%, and considerable interest in psychiatry as a career was noted at 21%. CONCLUSION Results indicate that the course significantly improved core psychiatric knowledge and that this improvement was retained after 1 month. An initial increase in interest in psychiatry as a career decreased almost to baseline at 1-month follow-up. Study limitations include the use of the same questionnaire at each stage knowledge was tested and the absence of a control group.
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Brown NJ, Newell CA, Stanley S, Chen JE, Perrin AJ, Kajala K, Hibberd JM. Independent and Parallel Recruitment of Preexisting Mechanisms Underlying C4 Photosynthesis. Science 2011; 331:1436-9. [DOI: 10.1126/science.1201248] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Maples K, Grubert J, Poff S, Aguiar M, McGuire E, Ebmeier S, Fantaskey A, Stanley S, Willis L. Basal Cell Hyperplasia as a Surrogate Marker for Subepithelial Fibrosis in Pediatric Eosinophilic Esophagitis. J Allergy Clin Immunol 2011. [DOI: 10.1016/j.jaci.2010.12.456] [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: 10/18/2022]
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Oldham M, Clift C, Thomas A, Farfan E, Foley T, Jannik T, Adamovics J, Holmes C, Stanley S. Initial experience with optical-CT scanning of RadBall Dosimeters. J Phys Conf Ser 2010; 250:012079. [PMID: 21218190 PMCID: PMC3016853 DOI: 10.1088/1742-6596/250/1/012079] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The RadBall dosimeter is a novel device for providing 3-D information on the magnitude and distribution of contaminant sources of unknown radiation in a given hot cell, glovebox, or contaminated room. The device is presently under evaluation by the National Nuclear Lab (NNL, UK) and the Savannah River National Laboratory (SRNL, US), for application as a diagnostic device for such unknown contaminants in the nuclear industry. A critical component of the technique is imaging the dose distribution recorded in the RadBall using optical-CT scanning. Here we present our initial investigations using the Duke Mid-sized Optical-CT Scanner (DMOS) to image dose distributions deposited in RadBalls exposed to a variety of radiation treatments.
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Affiliation(s)
- M Oldham
- Duke University Medical Center, Durham NC, USA
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Abstract
The purpose of this study was to evaluate the pharmacokinetics of omeprazole in three different vehicles when administered rectally to six alpacas. Alpacas were given single doses of omeprazole (4 mg/kg) in a double-blinded, randomized cross-over design with a 1 week washout period. Omeprazole formulations consisted of (1) Treatment A: omeprazole paste mixed in surgical lubricant (2) Treatment B: omeprazole capsule contents in 8.4% sodium bicarbonate and (3) Treatment C: omeprazole capsule contents in surgical lubricant and 8.4% sodium bicarbonate solution. Plasma samples were drawn at 0, 5, 10, 15, 30, 45, 60, 90, 120, 180, 300 and 480 min. Omeprazole plasma concentrations were determined by high-pressure liquid chromatography-mass spectrometry. Pharmacokinetic results demonstrated median peak plasma concentrations (C(max)) of 7.35 (3.2-15.2), 7.30 (1.7-10.9) and 8.65 (1.8-19.3) ng/mL and median area under the concentration curve (AUC((0-180))) of 747 (237-1681) min x ng/mL, 552.9 (39-1063) min x ng/mL, and 972 (107-1841) min x ng/mL for treatments A, B and C, respectively. The median half-lives were similar between groups: 38, 50, and 53 min. As a result of the low measured omeprazole plasma concentrations, it is assumed that rectal absorption of omeprazole is poor in alpacas and not an effective route of administration.
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Affiliation(s)
- T Marmulak
- W.R. Pritchard Veterinary Medical Teaching Hospital, University of California, Davis, CA 95616, USA.
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Waysek EH, Schierle J, Duesterloh A, Deshpande J, Austad J, Austad J, Blatt Y, Chan YF, Deshpande J, Duesterloh A, Kumar TKS, LaLuzerne P, Nemzer B, Ortiz JFL, Peadon P, Reif K, Schierle J, Stanley S, Tang CY. Determination of Lycopene in Dietary Supplements and Raw Materials by High-Performance Liquid Chromatography: Collaborative Study. J AOAC Int 2010. [DOI: 10.1093/jaoac/93.2.499] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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
Abstract
A collaborative study was conducted to evaluate the interlaboratory performance of an LC method for lycopene in dietary supplements and the raw materials commonly used in their manufacture. Twelve laboratories from six countries agreed to participate in the study. Results from 10 laboratories were received and are reported. Five dietary supplements, including both tablets and a softgel capsule with a lycopene content ranging from 25 g to 25 mg per unit, and three raw materials, including gelatin-based beadlets, vegetarian beadlets, and a suspension in oil ranging from 5 to 20 lycopene, were analyzed as blind duplicates. In addition to the commercial products, two positive controls and a negative control were included in the study. For the raw materials studied, the repeatability relative standard deviations (RSDr) ranged from 1.49 to 5.13 for total lycopene, and the reproducibility relative standard deviations (RSDR) ranged from 3.84 to 9.21 with HorRat values from 1.23 to 3.24. For finished products, the RSDr ranged from 1.31 to 4.62, RSDR from 4.28 to 10.5, and HorRat values from 0.79 to 2.07. Corresponding values for all-trans-lycopene were significantly higher. It is recommended that the method be considered for Official First Action for all-trans- and total lycopene in finished products and raw materials.
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Affiliation(s)
| | - Joseph Schierle
- DSM Nutritional Products Ltd, CH-4308, Kaiseraugst, Switzerland
| | | | - Jayant Deshpande
- OmniActive Health Technologies, A-131, Wagle Industrial Estate, Thane, India 400604
| | - John Austad
- Covance Laboratories, 3301 Kinsman Blvd, Madison, WI 53704
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Affiliation(s)
- S Stanley
- Department of Endocrinology, Birmingham Children's Hospital, Birmingham B4 6NH, UK
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Lindsay R, Sykes J, Stanley S, Dickinson R, Thwaites D. A TECHNICAL EVALUATION AND IMPLEMENTATION SURVEY OF THREE IGRT SYSTEMS AT ELEVEN UK CENTRES. Radiother Oncol 2009. [DOI: 10.1016/s0167-8140(12)72931-6] [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: 10/27/2022]
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Badger TM, Ronis MJJ, Wolff G, Stanley S, Ferguson M, Shankar K, Simpson P, Jo CH. Soy protein isolate reduces hepatosteatosis in yellow Avy/a mice without altering coat color phenotype. Exp Biol Med (Maywood) 2008; 233:1242-54. [PMID: 18791133 DOI: 10.3181/0802-rm-60] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Agouti (A(vy)/a) mice fed an AIN-93G diet containing the soy isoflavone genistein (GEN) prior to and during pregnancy were reported to shift coat color and body composition phenotypes from obese-yellow towards lean pseudoagouti, suggesting epigenetic programming. Human consumption of purified GEN is rare and soy protein is the primary source of GEN. Virgin a/a female and A(vy)/a male mice were fed AIN-93G diets made with casein (CAS) or soy protein isolate (SPI) (the same approximate GEN levels as in the above mentioned study) for 2 wks prior to mating. A(vy)/a offspring were weaned to the same diets and studied at age 75 d. Coat color distribution did not differ among diets, but SPI-fed, obese A(vy)/a offspring had lower hepatosteatosis (P < 0.05) and increased (P < 0.05) expression of CYP4a 14, a PPARalpha-regulated gene compared to CAS controls. Similarly, weanling male Sprague-Dawley (SD) rats fed SPI had elevated hepatic Acyl Co-A Oxidase (ACO) mRNA levels and increased in vitro binding of PPARalpha to the PPRE promoter response element. In another hepatosteatosis model, adult SD rats fed a high fat/cholesterol diet, SPI reduced (P < 0.05) steatosis. Thus, 1) consumption of diets made with SPI partially protected against hepatosteatosis in yellow mice and in SD rats, and this may involve induction of PPARalpha-regulated genes; and 2) the lifetime (in utero, neonatal and adult) exposure to dietary soy protein did not result in a shift in coat color phenotype of A(vy)/a mice. These findings, when compared with those of previously published studies of A(vy)/a mice, lead us to conclude that: 1) the effects of purified GEN differ from those of SPI when GEN equivalents are closely matched; 2) SPI does not epigenetically regulate the agouti locus to shift the coat color phenotype in the same fashion as GEN alone; and 3) SPI may be beneficial in management of non-alcoholic fatty liver disease.
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Affiliation(s)
- T M Badger
- Arkansas Children's Nutrition Center, Physiology & Biophysics, Little Rock, AR 72202, USA.
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Stanley S, Griffiths S, Sydes MR, Moore AR, Syndikus I, Dearnaley DP. Accuracy and reproducibility of conformal radiotherapy using data from a randomised controlled trial of conformal radiotherapy in prostate cancer (MRC RT01, ISRCTN47772397). Clin Oncol (R Coll Radiol) 2008; 20:582-90. [PMID: 18565744 PMCID: PMC2568874 DOI: 10.1016/j.clon.2008.04.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2007] [Revised: 04/08/2008] [Accepted: 04/10/2008] [Indexed: 11/24/2022]
Abstract
Aims The MRC RT01 trial used conformal radiotherapy to the prostate, a method that reduces the volume of normal tissue treated by 40–50%. Because of the risk of geographical miss, the trial used portal imaging to examine whether treatment delivery was within the required accuracy. Material and methods In total, 843 patients were randomly assigned to receive 64 Gy in 32 fractions over 6.5 weeks or 74 Gy in 37 fractions over 7.5 weeks. Field displacements and corrections were recorded for all imaged fractions. Displacement trends and their association with time, disease and treatment set-up characteristics were examined using univariate and multivariate analyses. A Radiographer Trial Implementation Group (RTIG) was set up to inform the quality assurance process and to promote the development of best practice. Results Treatment isocentre positioning was within 5 mm in every direction on 6238 (83%) of the 7535 fractions imaged. In total, 532 (81%) of 695 included patients had at least one ≥ 3mm displacement and 415 (63%) had at least one ≥ 5mm displacement. Univariate, multivariate and stepwise models of ≥ 5mm displacements showed an increased likelihood of displacement in weeks 1 and 2 with low melting point alloy (LMPA) blocks compared with multileaf collimators, film verification compared with electronic portal imaging (EPI) and increased number of fractions imaged. Except for LMPA, this was also seen for ≥ 5mm displacements in weeks 3–6. Conclusions Accurate conformal treatment was delivered. The use of EPI was associated with increased reported accuracy. The RTIG was a crucial part of the quality assurance process.
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Affiliation(s)
- S Stanley
- St James's Institute of Oncology, Leeds, UK.
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Zacny K, Bar-Cohen Y, Brennan M, Briggs G, Cooper G, Davis K, Dolgin B, Glaser D, Glass B, Gorevan S, Guerrero J, McKay C, Paulsen G, Stanley S, Stoker C. Drilling systems for extraterrestrial subsurface exploration. Astrobiology 2008; 8:665-706. [PMID: 18598141 DOI: 10.1089/ast.2007.0179] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Drilling consists of 2 processes: breaking the formation with a bit and removing the drilled cuttings. In rotary drilling, rotational speed and weight on bit are used to control drilling, and the optimization of these parameters can markedly improve drilling performance. Although fluids are used for cuttings removal in terrestrial drilling, most planetary drilling systems conduct dry drilling with an auger. Chip removal via water-ice sublimation (when excavating water-ice-bound formations at pressure below the triple point of water) and pneumatic systems are also possible. Pneumatic systems use the gas or vaporization products of a high-density liquid brought from Earth, gas provided by an in situ compressor, or combustion products of a monopropellant. Drill bits can be divided into coring bits, which excavate an annular shaped hole, and full-faced bits. While cylindrical cores are generally superior as scientific samples, and coring drills have better performance characteristics, full-faced bits are simpler systems because the handling of a core requires a very complex robotic mechanism. The greatest constraints to extraterrestrial drilling are (1) the extreme environmental conditions, such as temperature, dust, and pressure; (2) the light-time communications delay, which necessitates highly autonomous systems; and (3) the mission and science constraints, such as mass and power budgets and the types of drilled samples needed for scientific analysis. A classification scheme based on drilling depth is proposed. Each of the 4 depth categories (surface drills, 1-meter class drills, 10-meter class drills, and deep drills) has distinct technological profiles and scientific ramifications.
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Affiliation(s)
- K Zacny
- Honeybee Robotics Spacecraft Mechanisms Corporation, New York, NY 10001, USA.
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El Mezayen R, Pons L, Burks A, West M, Stanley S, El Gazzar M, Duncan M, Hansen K, Dreskin S. Ara H 2.02 Is A More Potent Cross-linker Of Anti- Peanut IgE Than Is Ara H 2.01. J Allergy Clin Immunol 2007. [DOI: 10.1016/j.jaci.2006.12.124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ochoa A, Zabaleta J, Rodriguez P, Stanley S. A14. Arginase/NO balance in situ regulates T cell function in cancer patients. Nitric Oxide 2007. [DOI: 10.1016/j.niox.2007.09.019] [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: 10/22/2022]
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Salas LA, Bedos A, Deharveng L, Fryer S, Hadiaty R, Heryanto, Munandar, Nardiyono, Noerdjito M, Noerdjito W, Rahmadi C, Riyanto A, Rofik, Ruskamdi A, Struebig MJ, Suhardjono Y, Suyanto A, Vermeulen JJ, Walck C, Wiriadinata H, Meijaard E, Stanley S. Biodiversity, endemism and the conservation of limestone Karsts in the Sangkulirang Peninsula, Borneo. ACTA ACUST UNITED AC 2005. [DOI: 10.1080/14888386.2005.9712762] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Skinner W, McKemie D, Stanley S. Quantitative Determination of Carisoprodol and its Metabolites in Equine Urine and Serum by Liquid Chromatography-Tandem Mass Spectrometry. Chromatographia 2004. [DOI: 10.1365/s10337-004-0244-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Kollias-Baker C, Maxwell L, Stanley S, Boone T. Detection and quantification of cocaine metabolites in urine samples from horses administered cocaine. J Vet Pharmacol Ther 2003; 26:429-34. [PMID: 14962054 DOI: 10.1046/j.0140-7783.2003.00535.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Cocaine is a naturally occurring alkaloid that is commonly abused by human-beings for its psychostimulatory effects. Occasionally, very small concentrations (i.e. <100 ng/mL) of the primary cocaine metabolite, benzoylecgonine (BZE) have been detected in urine collected from horses competing in athletic events. In this study urine samples, collected from four horses following the administration of 2.5 and 20 mg of cocaine sublingually and 50 mg of cocaine intravenously, were analyzed for the presence of cocaine and/or its metabolites by enzyme-linked immunosorbent assay (ELISA) and gas chromatography-mass spectrometry (GC-MS). The results of ELISA analysis of urine samples collected from all four horses suggested the presence of cocaine and/or its metabolites up to 10, 48, and 72 h after administration of 2.5, 20, and 50 mg of cocaine, respectively. The results of GC-MS analysis confirmed the presence of BZE above the limit of quantification (LOQ = 5 ng/mL) in urine samples collected from all four horses for up to 24 h after administration of 2.5 mg of cocaine and for up to 48 h after administration of 20 and 50 mg of cocaine. No obvious behavioral effects or overt alterations of heart rate or rhythm were noted in any of these horses after cocaine administration.
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Affiliation(s)
- C Kollias-Baker
- The Racing Laboratory, College of Veterinary Medicine, University of Florida Gainesville, FL 32610, USA.
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Mora AL, Corn RA, Stanic AK, Goenka S, Aronica M, Stanley S, Ballard DW, Joyce S, Boothby M. Antiapoptotic function of NF-kappaB in T lymphocytes is influenced by their differentiation status: roles of Fas, c-FLIP, and Bcl-xL. Cell Death Differ 2003; 10:1032-44. [PMID: 12934078 DOI: 10.1038/sj.cdd.4401257] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Inducible protection from apoptosis in vivo controls the size of cell populations. An important question in this respect is how differentiation affects mechanisms of apoptosis regulation. Among mature T lymphocytes, the NF-kappaB/Rel transcription factors are coupled to receptors that control cell population sizes by concurrently regulating survival and multiplication. In the present study, we used a transgenic inhibitor of NF-kappaB/Rel signaling to investigate the role of this pathway in proliferation and death of mature T cells in vivo. The results indicate that NF-kappaB integrates two critical yet distinct molecular pathways preventing apoptosis affected by the death receptor Fas, coordinately regulating levels of FLIP and Bcl-x(L) in primary T cells. Surprisingly, NF-kappaB blockade preferentially impacted naive as compared to memory T cells. The Fas/FasL pathway was linked to these findings by evidence that the abnormalities imposed by NF-kappaB inhibition were ameliorated by Fas deficiency, particularly for the CD4(+) lineage. Moreover, levels of an inhibitor of Fas-mediated apoptosis, c-FLIP, were diminished in cells expressing the transgenic inhibitor. NF-kappaB was also linked to T cell survival in vivo by mediating induction of Bcl-x(L): restoration of Bcl-x(L) levels reversed the preferential deficit of naive T cells, differentially impacting the CD4 and CD8 subsets. These results show that promoting survival and effective multiplication are central roles for NF-kappaB in T lymphoid homeostasis in vivo, but this effect and its underlying mechanisms are influenced by the developmental state of the lymphocyte.
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Affiliation(s)
- A L Mora
- Department of Microbiology & Immunology, Vanderbilt University Medical School, Nashville, TN 37232-2363, USA
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Stanley S, Percival CJ, Auer M, Braithwaite A, Newton MI, McHale G, Hayes W. Detection of polycyclic aromatic hydrocarbons using quartz crystal microbalances. Anal Chem 2003; 75:1573-7. [PMID: 12705587 DOI: 10.1021/ac0257546] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A chemically coated piezoelectric sensor has been developed for the determination of PAHs in the liquid phase. An organic monolayer attached to the surface of a gold electrode of a quartz crystal microbalance (QCM) via a covalent thiol-gold link complete with an ionically bound recognition element has been produced. This study has employed the PAH derivative 9-anthracene carboxylic acid which, once bound to the alkane thiol, functions as the recognition element. Binding of anthracene via pi-pi interaction has been observed as a frequency shift in the QCM with a detectability of the target analyte of 2 ppb and a response range of 0-50 ppb. The relative response of the sensor altered for different PAHs despite pi-pi interaction being the sole communication between recognition element and analyte. It is envisaged that such a sensor could be employed in the identification of key marker compounds and, as such, give an indication of total PAH flux in the environment.
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Affiliation(s)
- S Stanley
- Department of Chemistry and Physics, The Nottingham Trent University, Nottingham NG11 8NS, UK
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39
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Abstract
An acoustic wave sensor coated with an artificial biomimetic recognition element has been developed to selectively screen for nandrolone in the liquid phase. A highly specific covalently imprinted polymer (MIP) was spin coated onto one electrode of a quartz crystal microbalance (QCM) as a thin permeable film. Selective rebinding of the nandrolone was observed as a frequency shift in the QCM for concentrations up to 0.2 ppm with the sensor binding shown to favour nandrolone over analogous compounds.
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Affiliation(s)
- C J Percival
- Department of Chemistry and Physics, The Nottingham Trent University, Clifton Lane, Nottingham, UK NG11 8NS
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van Hoogmoed LM, Harmon FA, Stanley S, White J, Snyder J. In vitro investigation of the interaction between nitric oxide and cyclo-oxygenase activity in equine ventral colon smooth muscle. Equine Vet J 2002; 34:510-5. [PMID: 12358056 DOI: 10.2746/042516402776117836] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The objective of this study was to determine if a correlation exists between the presence of nitric oxide and prostaglandin release in the equine ventral colon smooth muscle, since this relationship may accentuate the inflammatory process during intestinal injury. Tissue was collected from the ventral colon, cut into muscle strips oriented along the circular, longitudinal and taenial layers, and mounted in a tissue bath system. Samples of the bath fluid were collected before, following electrical field stimulation (EFS), and following EFS in the presence of L-NAME, a nitric oxide synthase inhibitor. Muscle strips were also obtained following systemic administration of a cyclo-oxygnease inhibitor and samples were collected using the previously described protocol. Concentrations of prostaglandins were determined in the fluid samples using an ELISA. Electrical field stimulated release of nitric oxide produced a significant increase in prostaglandin production which did not occur in the presence of L-NAME. Systemic administration of flunixin meglumine reduced prostaglandin levels at all sampling periods, although a small increase was present following EFS. The results of this study support the hypothesis that there is a correlation between the release of nitric oxide and the production of prostaglandins in the smooth muscle of the large colon. This association between nitric oxide and prostaglandin may act as an important regulatory mechanism for various physiological mechanisms, such as vascular smooth muscle tone, and may contribute to amplified tissue injury when the induced forms of both enzymes are activated during an inflammatory insult. This suggests that the use and development of COX2 and iNOS inhibitors may help attenuate the inflammatory response following intestinal injury.
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Affiliation(s)
- L M van Hoogmoed
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis 95616, USA
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41
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Abstract
Based on its efficacy for the treatment of human asthma, the corticosteroid prednisone is commonly used in horses for treatment of recurrent airway obstruction. However, recent studies have failed to show any benefit of prednisone tablets for the treatment of this condition. The purpose of this study was to determine why oral prednisone has poor efficacy for the treatment of heaves in horses. In a crossover study, 5 horses were given the following treatments: prednisone tablets, prednisone liquid, prednisolone tablets, prednisolone liquid and i.v. prednisolone sodium succinate (positive control). Blood samples were taken before drug administration and at selected time points during a 24 h period. Serum concentrations of prednisone and prednisolone were determined in order to evaluate gastrointestinal absorption and hepatic metabolism. Serum concentrations of the endogenous glucocorticoid hydrocortisone were also determined as an indicator of the biological activity of the drugs. Both prednisolone tablets and liquid were absorbed rapidly, with prednisolone detectable in serum within 15 min of administration and with peak concentrations occurring within 45 min. Small amounts of prednisone were detected in the serum samples after administration of both prednisone tablets and liquid. Prednisolone was not detected in serum samples after administration of prednisone liquid and was detected in serum samples from only one horse after administration of prednisone tablets. Endogenous hydrocortisone production was suppressed when horses received prednisolone. The results of these studies indicate that prednisone has poor efficacy for the treatment of heaves because it is poorly absorbed and the active metabolite prednisolone is rarely produced. In contrast, prednisolone tablets have excellent bioavailability and should be useful as a therapeutic agent in horses.
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Affiliation(s)
- D L Peroni
- Department of Large Animal Clinical Sciences, Michigan State University, East Lansing 48824, USA
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42
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Mora AL, Stanley S, Armistead W, Chan AC, Boothby M. Inefficient ZAP-70 phosphorylation and decreased thymic selection in vivo result from inhibition of NF-kappaB/Rel. J Immunol 2001; 167:5628-35. [PMID: 11698434 DOI: 10.4049/jimmunol.167.10.5628] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Signaling from the TCR regulates T lymphoid survival, deletion by apoptosis, and selective clonal expansion. One set of signaling pathways activated during thymic selection leads to degradation of a cytosolic retention protein, the inhibitor of kappaB (IkappaB)alpha, followed by nuclear translocation of the NF-kappaB/Rel family of transcription factors. It has been found previously that NF-kappaB proteins mediate a pathway signaling the survival of mature T cells and protection of thymocytes against TNF-induced apoptosis. In contrast, we show in this study that a transgenic inhibitor of NF-kappaB/Rel signaling interferes with the negative selection of immature thymocytes by endogenous MHC ligands in vivo. Positive selection of the H-Y TCR also was diminished. This attenuation of thymic selection efficiency was associated with decreased ZAP-70 phosphorylation and TCR signaling of CD69 induction. These findings demonstrate that the NF-kappaB transcriptional pathway plays an important role in normal processes of clonal deletion and they indicate that the NF-kappaB/IkappaB axis can regulate the efficiency of TCR signaling.
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Affiliation(s)
- A L Mora
- Department of Microbiology and Immunology, Vanderbilt University Medical School, Nashville, TN 37232, USA
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43
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Percival CJ, Stanley S, Galle TM, Braithwaite A, Newton MI, McHale G, Hayes W. Molecular-imprinted, polymer-coated quartz crystal microbalances for the detection of terpenes. Anal Chem 2001; 73:4225-8. [PMID: 11569813 DOI: 10.1021/ac0155198] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A piezoelectric sensor coated with an artificial biomimetic recognition element has been developed for the determination of L-menthol in the liquid phase. A highly specific noncovalently imprinted polymer (MIP) was cast in situ on to the surface of a gold-coated quartz crystal microbalance (QCM) electrode as a thin permeable film. Selective rebinding of the target analyte was observed as a frequency shift quantified by piezoelectric microgravimetry with the QCM. The detectability of L-menthol was 200 ppb with a response range of 0-1.0 ppm. The response of the MIP-QCM to a range of monoterpenes was investigated with the sensor binding menthol in favor of analogous compounds. The sensor was able to distinguish between the D- and L-enantiomers of menthol owing to the enantioselectivity of the imprinted sites. To our knowledge, this is the first report describing enantiomeric resolution within an MIP utilizing a single monomer-functional moiety interaction. It is envisaged that this technique could be employed to determine the concentration of terpenes in the atmosphere.
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Affiliation(s)
- C J Percival
- Department of Chemistry and Physics, The Nottingham Trent University, Nottingham, UK.
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44
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Abstract
A number of advances in the scientific knowledge concerning adverse food reactions have been made in the past few years. Understanding about the nature of the food allergen itself, the molecular characterization of the epitopes on these allergens, the pathophysiology of the clinical reaction, and the diagnostic methods have all been significantly enhanced.
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Affiliation(s)
- W Burks
- Division of Pediatric Allergy and Immunology, University of Arkansas for Medical Sciences and Arkansas Children's Hospital, Little Rock, Arkansas 72202, USA
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Babcock HM, Ritchie DJ, Christiansen E, Starlin R, Little R, Stanley S. Successful treatment of vancomycin-resistant Enterococcus endocarditis with oral linezolid. Clin Infect Dis 2001; 32:1373-5. [PMID: 11303275 DOI: 10.1086/319986] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2000] [Revised: 09/01/2000] [Indexed: 11/03/2022] Open
Abstract
We report a case of vancomycin-resistant Enterococcus faecium endocarditis that failed to respond to sequential monotherapy with chloramphenicol and quinupristin/dalfopristin but was successfully treated with oral linezolid.
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Affiliation(s)
- H M Babcock
- Infectious Disease Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA.
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Meinertzhagen IA, Cole AG, Stanley S. The central nervous system, its cellular organisation and development, in the tadpole larva of the ascidian Ciona intestinalis. Acta Biol Hung 2001; 51:417-31. [PMID: 11034166] [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: 02/18/2023]
Abstract
From its numerical composition, the central nervous system (CNS) of the ascidian larva is one of the simplest known nervous systems having a chordate plan. Fewer than 350 cells together constitute a caudal nerve cord, an interposed visceral ganglion containing motor circuits for swimming and, rostrally, an expanded sensory vesicle containing major sensory and interneuron regions of the CNS. Some cells are ependymal, with ciliated surfaces lining the neural canal, while others are clearly either sensory receptors or motoneurons, but most are distinguishable only on cytological grounds. Although reassignments between categories are still being made, there is evidence for determinancy of total cell number. We have made three-dimensional cell maps either from serial semithin sections, or from confocal image stacks of whole-mounted embryos and larvae stained with nuclear markers. Comparisons between the maps of neural tubes in embryos of successive ages, that is, between cells in one map and their progeny in older maps, enable us to follow the line of mitotic descent through successive maps, at least for the caudal neural tube. Details are clear for the lateral cell rows in the neural tube, at least until the latter contains approximately 320 cells, and somewhat for the dorsal cell row, but the ventral row is more complex. In the hatched larva, serial-EM reconstructions of the visceral ganglion reveal two ventrolateral fibre bundles at the caudalmost end, each of 10-12 axons. These tracts include at least five pairs of presumed motor axons running into the caudal nerve cord. Two pairs of axons decussate. Complementing this vertebrate feature in the CNS of the larval form of Ciona, we confirm that synapses form upon the somata and dendrites of its neurons, and that its motor tracts are ventral.
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Affiliation(s)
- I A Meinertzhagen
- Neuroscience Institute, Life Sciences Centre, Dalhousie University, Halifax, Nova Scotia, Canada.
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Abstract
The pharmacokinetic behavior of furosemide concentrations in performance horses is of great interest to the equine industry and equine researchers. Specifically, such information is useful for the evaluation of the existing guidelines in several racing jurisdictions and for the possible development of new guidelines for varying time periods after administration. We studied several approaches within the framework of nonlinear mixed effects models to increase the accuracy of evaluating these guidelines. Theoretical properties of the proposed methods were examined and the variances of the resulting estimators compared. Their numerical performances were further evaluated through simulations. Finally, we applied these methods to a furosemide concentration profile data set and used our findings to address certain important practical issues.
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Affiliation(s)
- K K Chu
- Department of Statistics, Texas A&M University, College Station 77843-3143, USA.
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Abstract
Much social science writing about the Internet is disembodied. This paper will try show how this is rhetorically practiced by the cyberfeminist author Sadie Plant. From the work of Fred Newman, Michael Billig, and also from discourse work, comes the idea that it is not views that should be studied per se, but rather, the giving of views. To understand people, one needs to understand them when they are in dialogue with one another. Not to test them in isolation, but to study their interrelatedness as they perform social life. A social space was constructed through which embodiment could be revealed. This reality is "real space," the space that is on the other side of the screen, so to speak. To understand the psychology of the Internet is to enter into dialogue with people, and real space constitutes the embodied practice of social talk, specifically in the context of the interview. Two semistructured interviews were carried out with a student from the Ukraine. These interviews were transcribed closely. Just as real space constitutes interviews, cyberspace constitutes E-mailing. An international student born in New Zealand was questioned through E-mail. A discourse analysis was performed on selected extracts. The sequences were typified by diversity and multiplicity of theme, which included the drawing upon of embodied resources. The experience of being internationals in a U.K. academic institution were perpetually being negotiated, concomitantly to the giving of views about the Internet. The problematic issues of writing about social life are practically addressed in the discussion. I explore the realities created by real space and cyberspace by deconstructing them. Discourse work allowed for a critical self-reflection concerning the meanings that were given to the performance of the Internet.
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Affiliation(s)
- S Stanley
- Discourse and Rhetoric Group, Department of Social Sciences, Loughborough University, Leicestershire LE11 3TU, U.K.
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Meinertzhagen IA, Cole AG, Stanley S. The central nervous system, its cellular organisation and development, in the tadpole larva of the ascidian Ciona intestinalis. BIOLOGIA FUTURA 2000. [DOI: 10.1007/bf03543240] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Nieto JE, Snyder JR, Kollias-Baker C, Stanley S. In vitro effects of 5-hydroxytryptamine and cisapride on the circular smooth muscle of the jejunum of horses. Am J Vet Res 2000; 61:1561-5. [PMID: 11131599 DOI: 10.2460/ajvr.2000.61.1561] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine effects of cisapride and 5-hydroxytryptamine (5-HT) on the jejunum of horses. SAMPLE POPULATION Jejunal muscle strips from 8 horses. PROCEDURE Muscle strips were suspended in isolated muscle baths. Isometric stress responses to 5-HT and cisapride, with and without specific antagonists, were determined. RESULTS Muscle strips incubated with atropine and tetrodotoxin responded to 5-HT and cisapride with an increase in contractile force. The 5-HT caused a concentration-dependent increase in contractile amplitude, with a maximum response (Emax) of 1,151+/-214 g/cm2 and a molar concentration that induces contractile force equal to 50% of maximum response (EC50) of 0.028+/-0.002 microM. Prior incubation with the 5-HT2 antagonist ketanserin decreased the Emax (626 +/-147 g/cm2) and potency (EC50, 0.307+/-0.105 microM) of 5-HT Prior incubation with the 5-HT3 antagonist tropisetron decreased the efficacy (Emax, 894+/-184 g/cm2) to 5-HT Cisapride also caused a concentration-dependent increase in contractile amplitude, with an Emax of 331+/-82 g/cm2 and an EC50 of 0.302+/-0.122 microM. Prior incubation with ketanserin decreased the Emax (55+/-17 g/cm2) and potency (EC50, 0.520+/-0.274 microM) of cisapride. CONCLUSION AND CLINICAL RELEVANCE Stimulatory effects of 5-HT and cisapride on circular smooth muscle of equine jejunum are mediated primarily through a noncholinergic effect. The effects of 5-HT are mediated, at least partially, by 5-HT2 and 5-HT3 receptors, whereas the effects of cisapride are mediated primarily by 5-HT2 receptors. This may impact treatment of horses with postoperative ileus.
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Affiliation(s)
- J E Nieto
- Department of Veterinary Surgical and Radiological Sciences, University of California, Davis 95616, USA
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