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Valcarce V, Stafford LS, Neu J, Parker L, Vicuna V, Cross T, D'Agati O, Diakite S, Haley A, Feigenbaum J, Al Mahmoud MY, Visvalingam A, Cacho N, Kosik I, Yewdell JW, Larkin J. COVID-19 booster enhances IgG mediated viral neutralization by human milk in vitro. Front Nutr 2024; 11:1289413. [PMID: 38406184 PMCID: PMC10884187 DOI: 10.3389/fnut.2024.1289413] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 01/25/2024] [Indexed: 02/27/2024] Open
Abstract
Background Facilitated by the inability to vaccinate, and an immature immune system, COVID-19 remains a leading cause of death among children. Vaccinated lactating mothers produce specific SARS-CoV-2 antibodies in their milk, capable of neutralizing the virus in vitro. Our objective for this study is to assess the effect of COVID-19 booster dose on SARS-CoV-2 antibody concentration and viral neutralization in milk, plasma, and infant stool. Methods Thirty-nine mothers and 25 infants were enrolled from December 2020 to May 2022. Milk, maternal plasma, and infants' stool were collected at various time-points up to 12 months following mRNA COVID-19 vaccination. A subgroup of 14 mothers received a booster dose. SARS-CoV-2 antibody levels and their neutralization capacities were assessed. Results Booster vaccination led to significantly higher IgG levels within human milk and breastfed infants' stool. In vitro neutralization of VSV-gfp-SARS-CoV-2-S-gp, a laboratory safe SARS-CoV-2 like pseudovirus, improved following the booster, with a 90% increase in plasma neutralization and a 60% increase in milk neutralization. We found that post-booster neutralization by human milk was highly correlated to SARS-CoV-2 IgG level. In support of our correlation result, Protein G column depletion of IgG in milk yielded a significant reduction in viral neutralization (p = 0.04). Discussion The substantial increase in neutralizing IgG levels in milk and breastfed infants' stool post-booster, coupled with the decrease in milk neutralization capabilities upon IgG depletion, underscores the efficacy of booster doses in augmenting the immune response against SARS-CoV-2 in human milk.
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Affiliation(s)
- Vivian Valcarce
- Department of Pediatrics, University of Florida, Gainesville, FL, United States
- Division of Neonatology, Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Lauren Stewart Stafford
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, United States
| | - Josef Neu
- Department of Pediatrics, University of Florida, Gainesville, FL, United States
| | - Leslie Parker
- College of Nursing, University of Florida, Gainesville, FL, United States
| | - Valeria Vicuna
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, United States
| | - Tyler Cross
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, United States
| | - Olivia D'Agati
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, United States
| | - Sisse Diakite
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, United States
| | - Addison Haley
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, United States
| | - Jake Feigenbaum
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, United States
| | - Mahmoud Y. Al Mahmoud
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, United States
| | - Anjali Visvalingam
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, United States
| | - Nicole Cacho
- Department of Pediatrics, University of Florida, Gainesville, FL, United States
- Department of Pediatrics, University of California Davis, Sacramento, CA, United States
| | - Ivan Kosik
- Laboratory of Viral Diseases, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Bethesda, MD, United States
| | - Jonathan W. Yewdell
- Laboratory of Viral Diseases, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Bethesda, MD, United States
| | - Joseph Larkin
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, United States
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Friedman JK, Taylor BC, Hagel Campbell E, Allen K, Bangerter A, Branson M, Bronfort G, Calvert C, Cross L, Driscoll M, Evans R, Ferguson JE, Haley A, Hennessy S, Meis LA, Burgess DJ. Gender differences in PTSD severity and pain outcomes: baseline results from the LAMP trial. medRxiv 2023:2023.10.13.23296998. [PMID: 37873176 PMCID: PMC10593051 DOI: 10.1101/2023.10.13.23296998] [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] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Background Post-traumatic stress disorder (PTSD) and chronic pain are highly prevalent comorbid conditions. Veterans dually burdened by PTSD and chronic pain experience more severe outcomes compared to either disorder alone. Few studies have enrolled enough women Veterans to test gender differences in pain outcomes [catastrophizing, intensity, interference] by the severity of PTSD. Aim Examine gender differences in the association between PTSD symptoms and pain outcomes among Veterans enrolled in a chronic pain clinical trial. Methods Participants were 421 men and 386 women Veterans with chronic pain who provided complete data on PTSD symptoms and pain outcomes. We used hierarchical linear regression models to examine gender differences in pain outcomes by PTSD symptoms. Results Adjusted multivariable models indicated that PTSD symptoms were associated with higher levels of pain catastrophizing (0.57, 95% CI [0.51, 0.63]), pain intensity (0.30, 95% CI [0.24, 0.37]), and pain interference (0.46, 95% CI [0.39, 0.52]). No evidence suggesting differences in this association were found in either the crude or adjusted models (all interaction p-values<0.05). Conclusion These findings may reflect the underlying mutual maintenance of these conditions whereby the sensation of pain could trigger PTSD symptoms, particularly if the trauma and pain are associated with the same event. Clinical implications and opportunities testing relevant treatments that may benefit both chronic pain and PTSD are discussed.
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Affiliation(s)
- J K Friedman
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
- University of Minnesota Medical School, Minneapolis, MN
| | - B C Taylor
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
- University of Minnesota Medical School, Minneapolis, MN
| | - E Hagel Campbell
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
| | - K Allen
- Center of Innovation to Accelerate Discovery and Practice Transformation, Durham VAHCS, Durham, NC
- Thurston Arthritis Research Center, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - A Bangerter
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
| | - M Branson
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
| | - G Bronfort
- Integrative Health & Wellbeing Research Program, Bakken Center for Spirituality & Healing, University of Minnesota, Minneapolis, MN
- University of Minnesota School of Nursing, Minneapolis, MN
| | - C Calvert
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
- University of Minnesota Medical School, Minneapolis, MN
| | - Ljs Cross
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
| | - M Driscoll
- VA Connecticut Healthcare System, West Haven, CT
- Yale School of Medicine, New Haven, CT
| | - R Evans
- Integrative Health & Wellbeing Research Program, Bakken Center for Spirituality & Healing, University of Minnesota, Minneapolis, MN
- University of Minnesota School of Nursing, Minneapolis, MN
| | - J E Ferguson
- University of Minnesota Medical School, Minneapolis, MN
| | - A Haley
- Integrative Health & Wellbeing Research Program, Bakken Center for Spirituality & Healing, University of Minnesota, Minneapolis, MN
- University of Minnesota School of Nursing, Minneapolis, MN
| | - S Hennessy
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
| | - L A Meis
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
- University of Minnesota Medical School, Minneapolis, MN
- Women's Health Sciences Division, National Center for PTSD, Boston, MA
| | - D J Burgess
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
- University of Minnesota Medical School, Minneapolis, MN
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Bradley P, Wilson J, Taylor R, Nixon J, Redfern J, Whittemore P, Gaddah M, Kavuri K, Haley A, Denny P, Withers C, Robey RC, Logue C, Dahanayake N, Min DSH, Coles J, Deshmukh MS, Ritchie S, Malik M, Abdelaal H, Sivabalah K, Hartshorne MD, Gopikrishna D, Ashish A, Nuttall E, Bentley A, Bongers T, Gatheral T, Felton TW, Chaudhuri N, Pearmain L. Conventional oxygen therapy versus CPAP as a ceiling of care in ward-based patients with COVID-19: a multi-centre cohort evaluation. EClinicalMedicine 2021; 40:101122. [PMID: 34514360 PMCID: PMC8424135 DOI: 10.1016/j.eclinm.2021.101122] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Continuous positive airway pressure (CPAP) therapy is commonly used for respiratory failure due to severe COVID-19 pneumonitis, including in patients deemed not likely to benefit from invasive mechanical ventilation (nIMV). Little evidence exists demonstrating superiority over conventional oxygen therapy, whilst ward-level delivery of CPAP presents practical challenges. We sought to compare clinical outcomes of oxygen therapy versus CPAP therapy in patients with COVID-19 who were nIMV. METHODS This retrospective multi-centre cohort evaluation included patients diagnosed with COVID-19 who were nIMV, had a treatment escalation plan of ward-level care and clinical frailty scale ≤ 6. Recruitment occurred during the first two waves of the UK COVID-19 pandemic in 2020; from 1st March to May 31st, and from 1st September to 31st December. Patients given CPAP were compared to patients receiving oxygen therapy that required FiO2 ≥0.4 for more than 12 hours at hospitals not providing ward-level CPAP. Logistic regression modelling was performed to compare 30-day mortality between treatment groups, accounting for important confounders and within-hospital clustering. FINDINGS Seven hospitals provided data for 479 patients during the UK COVID-19 pandemic in 2020. Overall 30-day mortality was 75.6% in the oxygen group (186/246 patients) and 77.7% in the CPAP group (181/233 patients). A lack of evidence for a treatment effect persisted in the adjusted model (adjusted odds ratio 0.84 95% CI 0.57-1.23, p=0.37). 49.8% of patients receiving CPAP-therapy (118/237) chose to discontinue it. INTERPRETATION No survival difference was found between using oxygen alone or CPAP to treat patients with severe COVID-19 who were nIMV. A high patient-initiated discontinuation rate for CPAP suggests a significant treatment burden. Further reflection is warranted on the current treatment guidance and widespread application of CPAP in this setting. FUNDING L Pearmain is supported by the MRC (MR/R00191X/1). TW Felton is supported by the NIHR Manchester Biomedical Research Centre.
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Affiliation(s)
- P Bradley
- North West Lung Centre, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
- Respiratory department, Blackpool Teaching Hospitals NHS Foundation Trust, Blackpool, UK
- NWCORR North West Collaborative Organisation for Respiratory Research
| | - J Wilson
- Respiratory department, Blackpool Teaching Hospitals NHS Foundation Trust, Blackpool, UK
- Department of infectious diseases and tropical medicine. North Manchester General Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - R Taylor
- Research and Development, Blackpool Teaching Hospitals NHS Foundation Trust, Blackpool, UK
| | - J Nixon
- Respiratory department, Royal Preston Hospital, Lancashire Teaching Hospitals NHS Foundation Trust, Preston, UK
- NWCORR North West Collaborative Organisation for Respiratory Research
| | - J Redfern
- Respiratory department, Royal Preston Hospital, Lancashire Teaching Hospitals NHS Foundation Trust, Preston, UK
| | - P Whittemore
- Department of infectious diseases and tropical medicine. North Manchester General Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - M Gaddah
- Respiratory department, University Hospitals of Morecambe Bay NHS Foundation Trust, Lancaster, UK
| | - K Kavuri
- Respiratory department, Royal Albert Edward Infirmary, Wrightington, Wigan and Leigh Teaching Hospitals NHS Foundation Trust, Wigan, UK
| | - A Haley
- Respiratory department, University Hospitals of Morecambe Bay NHS Foundation Trust, Lancaster, UK
| | - P Denny
- Respiratory department, University Hospitals of Morecambe Bay NHS Foundation Trust, Lancaster, UK
| | - C Withers
- North West Lung Centre, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - RC Robey
- North West Lung Centre, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - C Logue
- North West Lung Centre, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - N Dahanayake
- Department of infectious diseases and tropical medicine. North Manchester General Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - D Siaw Hui Min
- Department of infectious diseases and tropical medicine. North Manchester General Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - J Coles
- Department of infectious diseases and tropical medicine. North Manchester General Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - M S Deshmukh
- Department of infectious diseases and tropical medicine. North Manchester General Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - S Ritchie
- Department of infectious diseases and tropical medicine. North Manchester General Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - M Malik
- Respiratory department, Blackpool Teaching Hospitals NHS Foundation Trust, Blackpool, UK
| | - H Abdelaal
- Respiratory department, Blackpool Teaching Hospitals NHS Foundation Trust, Blackpool, UK
| | - K Sivabalah
- Respiratory department, Blackpool Teaching Hospitals NHS Foundation Trust, Blackpool, UK
| | - MD Hartshorne
- Respiratory department, Royal Albert Edward Infirmary, Wrightington, Wigan and Leigh Teaching Hospitals NHS Foundation Trust, Wigan, UK
| | - D Gopikrishna
- Respiratory department, Royal Albert Edward Infirmary, Wrightington, Wigan and Leigh Teaching Hospitals NHS Foundation Trust, Wigan, UK
| | - A Ashish
- Respiratory department, Royal Albert Edward Infirmary, Wrightington, Wigan and Leigh Teaching Hospitals NHS Foundation Trust, Wigan, UK
| | - E Nuttall
- Respiratory department, Royal Preston Hospital, Lancashire Teaching Hospitals NHS Foundation Trust, Preston, UK
| | - A Bentley
- North West Lung Centre, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
- Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester and Manchester University NHS Foundation Trust, Manchester, UK
| | - T Bongers
- Respiratory department, Blackpool Teaching Hospitals NHS Foundation Trust, Blackpool, UK
| | - T Gatheral
- Respiratory department, University Hospitals of Morecambe Bay NHS Foundation Trust, Lancaster, UK
| | - TW Felton
- North West Lung Centre, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
- Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester and Manchester University NHS Foundation Trust, Manchester, UK
| | - N Chaudhuri
- North West Lung Centre, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
- Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester and Manchester University NHS Foundation Trust, Manchester, UK
| | - L Pearmain
- North West Lung Centre, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
- NWCORR North West Collaborative Organisation for Respiratory Research
- Division of Diabetes, Endocrinology and Gastroenterology, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, Manchester, UK
- Wellcome Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health and Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
- Corresponding author. L Pearmain. Piper Hanley Laboratory, Floor 3 AV Hill Building, The University of Manchester, Manchester, UK, M13 9PT
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Barrett M, Holt K, Haley A, Leininger L, Sonnenday CJ, Sandhu G, Gauger PG. Needs assessment can guide creation of a "resident-optimized clinic" in surgery. Am J Surg 2019; 218:648-652. [PMID: 30826007 DOI: 10.1016/j.amjsurg.2019.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Revised: 01/21/2019] [Accepted: 02/02/2019] [Indexed: 11/24/2022]
Abstract
BACKGROUND There is limited data on deliberate teaching of residents in the clinic setting; we sought to investigate the clinic experience at our institution and improve education through creation of a novel "Resident-Optimized Clinic" (ROC). METHODS An online survey was sent separately to residents and faculty. Based on the results of this survey a modified ROC was developed to try to improve the obstacles to learning in clinic. RESULTS Qualitative analysis revealed the barriers in clinic were inconsistencies in expectations, lack of autonomy, time, and facility limitations. The modified ROC was rated positively with 100% of participants expressing they had sufficient time and autonomy; and 90% felt the environment was optimized for teaching. CONCLUSIONS Multiple themes have been identified as problematic for the clinic education experience. The ROC was rated positively by trainees suggesting thoughtful intervention to improve clinic results in a better clinic experience and more educational gain from the clinic environment.
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Affiliation(s)
- M Barrett
- Department of Surgery, Ann Arbor, MI, 48109, USA.
| | - K Holt
- Department of Surgery, Ann Arbor, MI, 48109, USA.
| | - A Haley
- Department of Surgery, Ann Arbor, MI, 48109, USA.
| | - L Leininger
- Department of Surgery, Ann Arbor, MI, 48109, USA.
| | | | - G Sandhu
- Department of Surgery, Ann Arbor, MI, 48109, USA; Department of Learning Health Sciences, Ann Arbor, MI, 48109, USA.
| | - P G Gauger
- Department of Surgery, Ann Arbor, MI, 48109, USA.
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Cassill C, Kaur S, Parker P, Ireton A, Haley A. B-20Metabolic Syndrome, Memory Function & Gender in Middle Age. Arch Clin Neuropsychol 2015. [DOI: 10.1093/arclin/acv047.116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Parker P, Birdsill A, Cassill C, Pasha E, Grier K, Tanaka H, Haley A. C-37Cardiovascular Fitness, Executive Function and Brain Derived Neurotrophic Factor in Midlife. Arch Clin Neuropsychol 2015. [DOI: 10.1093/arclin/acv047.239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yeamans CL, Haley A, Gutierrez-Quintana R, Penderis J. Surgical Anatomical Landmarks of the Thoracolumbar Vertebral Column on Magnetic Resonance Imaging in Dogs. Anat Histol Embryol 2015; 45:140-4. [PMID: 26105110 DOI: 10.1111/ahe.12184] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 05/07/2015] [Indexed: 12/01/2022]
Abstract
Magnetic resonance imaging (MRI) in veterinary medicine profoundly improved spinal cord disease investigation in canine patients. We aimed to further describe the anatomical landmarks of the thoracolumbar junction in sagittal MRI sequences. MRI studies from 90 dogs were reviewed retrospectively, representing a broad cross section of breeds and body weights. The ratio of the distance from the dorsal aspect of the vertebral canal to the dorsal aspect of the transverse process or rib articulation relative to the length of L2 vertebra was determined for T12, T13, L1 and L2 vertebrae. A statistically significant difference was noted with the transverse processes being more ventrally located than the cranial fovea costalis. The lumbar transverse processes and rib articulations dramatically varied in shape, being oval or round, respectively. The sagittal image at the level of the lateral margin of the articular facet joint proved to be the most consistent for review of these structures.
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Affiliation(s)
- C L Yeamans
- School of Veterinary Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Bearsden Road, Glasgow, G61 1QH, UK
| | - A Haley
- School of Veterinary Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Bearsden Road, Glasgow, G61 1QH, UK
| | - R Gutierrez-Quintana
- School of Veterinary Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Bearsden Road, Glasgow, G61 1QH, UK
| | - J Penderis
- School of Veterinary Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Bearsden Road, Glasgow, G61 1QH, UK
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Hicks J, Platt S, Kent M, Haley A. Canine brain tumours: a model for the human disease? Vet Comp Oncol 2015; 15:252-272. [PMID: 25988678 DOI: 10.1111/vco.12152] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [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: 10/10/2014] [Revised: 04/04/2015] [Accepted: 04/06/2015] [Indexed: 01/10/2023]
Abstract
Canine brain tumours are becoming established as naturally occurring models of disease to advance diagnostic and therapeutic understanding successfully. The size and structure of the dog's brain, histopathology and molecular characteristics of canine brain tumours, as well as the presence of an intact immune system, all support the potential success of this model. The limited success of current therapeutic regimens such as surgery and radiation for dogs with intracranial tumours means that there can be tremendous mutual benefit from collaboration with our human counterparts resulting in the development of new treatments. The similarities and differences between the canine and human diseases are described in this article, emphasizing both the importance and limitations of canines in brain tumour research. Recent clinical veterinary therapeutic trials are also described to demonstrate the areas of research in which canines have already been utilized and to highlight the important potential benefits of translational research to companion dogs.
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Affiliation(s)
- J Hicks
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - S Platt
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - M Kent
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - A Haley
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
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Kent M, Glass EN, de Lahunta A, Platt SR, Haley A. Prevalence of effusion in the tympanic cavity in dogs with dysfunction of the trigeminal nerve: 18 cases (2004-2013). J Vet Intern Med 2013; 27:1153-8. [PMID: 23875748 DOI: 10.1111/jvim.12140] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [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: 03/16/2013] [Revised: 05/14/2013] [Accepted: 05/30/2013] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND Animals with disorders involving the trigeminal nerve or its nuclei in the brainstem can have effusion in the tympanic cavity ipsilateral to the side of the neurological deficits. The tensor veli palatini muscle (TVP), innervated by the mandibular branch of the trigeminal nerve, opens the pharyngeal orifice of the auditory tube. With denervation of the TVP, dysfunction of the auditory tube may occur, which could lead to effusion. HYPOTHESIS/OBJECTIVES To determine the prevalence of effusion in the tympanic cavity in dogs with disorders involving the trigeminal nerve. ANIMALS Eighteen client-owned dogs were evaluated retrospectively. METHODS Retrospective study. RESULTS Diagnostic imaging databases were searched for dogs having undergone magnetic resonance imaging (MRI) evaluation for signs referable to dysfunction of the trigeminal nerve. Signalment and neurological examination findings were recorded. The MRI study was evaluated for the presence or absence of effusion. MRI characteristics of the affected trigeminal nerve and the muscles of mastication were recorded. Based on the location of the trigeminal nerve lesion, dogs were divided into three categories: brainstem, trigeminal canal, or extracranial. Eighteen dogs met the inclusion criteria. Six of 18 dogs (33%) had effusion in the tympanic cavity ipsilateral to the affected trigeminal nerve. CONCLUSION AND CLINICAL IMPORTANCE A substantial proportion of dogs with a lesion affecting the trigeminal nerve had effusion in the tympanic cavity. This finding likely represents denervation of the TVP muscle, which may have led to dysfunction of the auditory tube.
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Affiliation(s)
- M Kent
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, GA
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Peng PWH, Li C, Farcas E, Haley A, Wong W, Bender J, Chung F. Use of low-dose pregabalin in patients undergoing laparoscopic cholecystectomy. Br J Anaesth 2010; 105:155-61. [PMID: 20581215 DOI: 10.1093/bja/aeq116] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND The objective of this study was to examine the effects of low-dose pregabalin on the analgesic efficacy, side-effects, and recovery profile in patients undergoing laparoscopic cholecystectomy. METHODS One hundred and sixty-two patients aged 18-65 yr, of ASA physical status I-III, undergoing elective outpatient laparoscopic cholecystectomy were recruited and randomized in this prospective, placebo-controlled, double-blind study to receive one of the following study medications orally: pregabalin 50 mg, pregabalin 75 mg, or placebo, 1 h before surgery and then every 12 h after operation for a total of three doses. Postoperative numeric pain scores, analgesic consumption, recovery score (QoR-40), and side-effects (opioid-related symptom distress scale) were assessed in the early postoperative period (every 15 min during the first hour, at 90, 120 min, 6, and 12 h) and at days 1, 2, and 7. Data were analysed using an intention-to-treat method. RESULTS Compared with the placebo group, the pain scores were lower in the pregabalin 75 mg group in the first 90 min after surgery (P<0.05). Pregabalin 50 mg resulted in pain reduction at 30 and 45 min (P<0.05) relative to placebo. The analgesic consumption, side-effects, and recovery scores were similar among the three groups. CONCLUSIONS Perioperative administration of pregabalin 75 mg provided limited analgesic benefit in the postoperative period. An updated meta-analysis confirms this finding (see Supplementary material).
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Affiliation(s)
- P W H Peng
- Department of Anesthesia, Toronto Western Hospital, University of Toronto, 399 Bathurst Street, Toronto, Ontario, Canada.
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Correa-Pérez J, Levin A, Haley A, Wilbois R. P-259. Fertil Steril 2006. [DOI: 10.1016/j.fertnstert.2006.07.612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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Correa-Pérez J, Levin A, Haley A, Wilbois R. P-242. Fertil Steril 2006. [DOI: 10.1016/j.fertnstert.2006.07.595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
The objective of this paper was to identify predictors of attrition in a study designed to assess whether cognitive behavioural therapy (CBT) was more helpful than supportive therapy (SP) in reducing pain associated with peripheral neuropathy in HIV-positive patients. Sixty-one subjects were randomized into either CBT or SP for six weekly one-hour sessions. Twenty-eight subjects dropped out before week six. Demographic variables such as age, gender, ethnicity, socioeconomic status and level of education were not predictive of attrition. However, higher scores on the Hamilton Depression Inventory (HAM-D, 17-item) (t (59) = - 0.09, p<0.05) were predictive. These findings suggest that while dropouts were not more physically ill (e.g. CD4 counts, viral loads and opportunistic infections were not statistically higher), they reported greater psychological distress.
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Affiliation(s)
- L Davis
- Weill Medical College of Cornell University, New York, USA.
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Wood NT, Haley A, Viry-Moussaïd M, Johnson CH, van der Luit AH, Trewavas AJ. The calcium rhythms of different cell types oscillate with different circadian phases. Plant Physiol 2001; 125:787-96. [PMID: 11161036 PMCID: PMC64880 DOI: 10.1104/pp.125.2.787] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2000] [Revised: 08/22/2000] [Accepted: 10/02/2000] [Indexed: 05/17/2023]
Abstract
Transgenic tobacco (Nicotiana plumbaginifolia) seedlings containing the Ca(2+)-sensitive luminescent protein aequorin have been shown to exhibit circadian variations in cytosolic calcium. Concomitant measurements of cytosolic and nuclear calcium show that circadian variations in the cytoplasm are not expressed in the nucleus. To investigate whether all cells of transgenic seedlings contribute equally to circadian variations in cytosolic calcium, different promoters eliciting different expression patterns have been placed upstream of aequorin and used for transformation. The circadian peak occurred at different times in the three transgenic lines constructed. Luminescence imaging of these transgenic lines indicated that aequorin was differentially accumulated among the main tissues and cells of the seedlings and overcoat technology with applied epidermal strips indicated that the surface cell layers contribute the vast majority of luminescent light. We conclude that the Ca(2+) rhythmicities of cells and tissues oscillate with distinct differences in phase, that this might represent different underlying cellular control mechanisms and that these observations have significant implications for our understanding and study of Ca(2+) mediated signal transduction in plant cells.
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Affiliation(s)
- N T Wood
- Institute of Cell and Molecular Biology, Kings Buildings, Mayfield Road, University of Edinburgh, Edinburgh EH9 3JH, United Kingdom.
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15
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Abstract
Two novel approaches for the study of Ca2+-mediated signal transduction in stomatal guard cells are described. Stimulus-induced changes in guard-cell cytosolic Ca2+ ([Ca2+]cyt) were monitored using viable stomata in epidermal strips of a transgenic line of Nicotiana plumbaginifolia expressing aequorin (the proteinous luminescent reporter of Ca2+) and in a new transgenic line in which aequorin expression was targeted specifically to the guard cells. The results indicated that abscisic acid (ABA)-induced stomatal closure was accompanied by increases in [Ca2+]cyt in epidermal strips. In addition to ABA, mechanical and low-temperature signals directly affected stomatal behaviour, promoting rapid closure. Elevations of guard-cell [Ca2+]cyt play a key role in the transduction of all three stimuli. However, there were striking differences in the magnitude and kinetics of the three responses. Studies using Ca2+ channel blockers and the Ca2+ chelator EGTA further suggested that mechanical and ABA signals primarily mobilize Ca2+ from intracellular store(s), whereas the influx of extracellular Ca2+ is a key component in the transduction of low-temperature signals. These results illustrate an aspect of Ca2+ signalling whereby the specificity of the response is encoded by different spatial or kinetic Ca2+ elevations.
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Affiliation(s)
- N T Wood
- Institute of Cell and Molecular Biology, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JH, UK
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16
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van Der Luit AH, Olivari C, Haley A, Knight MR, Trewavas AJ. Distinct calcium signaling pathways regulate calmodulin gene expression in tobacco. Plant Physiol 1999; 121:705-14. [PMID: 10557218 PMCID: PMC59432 DOI: 10.1104/pp.121.3.705] [Citation(s) in RCA: 65] [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] [Subscribe] [Scholar Register] [Received: 05/16/1999] [Accepted: 07/20/1999] [Indexed: 05/17/2023]
Abstract
Cold shock and wind stimuli initiate Ca(2+) transients in transgenic tobacco (Nicotiana plumbaginifolia) seedlings (named MAQ 2.4) containing cytoplasmic aequorin. To investigate whether these stimuli initiate Ca(2+) pathways that are spatially distinct, stress-induced nuclear and cytoplasmic Ca(2+) transients and the expression of a stress-induced calmodulin gene were compared. Tobacco seedlings were transformed with a construct that encodes a fusion protein between nucleoplasmin (a major oocyte nuclear protein) and aequorin. Immunocytochemical evidence indicated targeting of the fusion protein to the nucleus in these plants, which were named MAQ 7.11. Comparison between MAQ 7.11 and MAQ 2.4 seedlings confirmed that wind stimuli and cold shock invoke separate Ca(2+) signaling pathways. Partial cDNAs encoding two tobacco calmodulin genes, NpCaM-1 and NpCaM-2, were identified and shown to have distinct nucleotide sequences that encode identical polypeptides. Expression of NpCaM-1, but not NpCaM-2, responded to wind and cold shock stimulation. Comparison of the Ca(2+) dynamics with NpCaM-1 expression after stimulation suggested that wind-induced NpCaM-1 expression is regulated by a Ca(2+) signaling pathway operational predominantly in the nucleus. In contrast, expression of NpCaM-1 in response to cold shock is regulated by a pathway operational predominantly in the cytoplasm.
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Affiliation(s)
- A H van Der Luit
- Institute for Molecular Cell Biology, University of Amsterdam, Kruislaan 318, 1098 SM Amsterdam, The Netherlands.
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17
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Haley A, Hunter T, Kiberstis P, Zimmern D. Multiple serine phosphorylation sites on the 30 kDa TMV cell-to-cell movement protein synthesized in tobacco protoplasts. Plant J 1995; 8:715-24. [PMID: 8528282 DOI: 10.1046/j.1365-313x.1995.08050715.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
p30, the protein required for cell-to-cell movement of tobacco mosaic virus (TMV), has a slightly reduced mobility on SDS-polyacrylamide gels when isolated by immunoprecipitation from TMV-infected protoplasts compared with that of p30 translated from viral RNA in vitro. Further investigation established a probable cause for the difference in mobility between the two: protoplasts incorporate [32P]orthophosphate into p30 at multiple sites, predominantly as phosphoserine. Tryptic peptide mapping reveals at least five internal phosphopeptides in p30, besides the C-terminal tryptic phosphopeptide already reported, involving at least two distinct domains of the protein (at residues 61-114 and residues 212-231), which may be substrates for different protein kinases. These structural results are consistent with a three-domain model for the TMV movement protein with two regulatory domains similar to that recently proposed on genetic grounds for dianthovirus movement proteins.
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Affiliation(s)
- A Haley
- MRC Laboratory of Molecular Biology, Cambridge, UK
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18
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Abstract
Tobacco and Arabidopsis plants, expressing a transgene for the calcium-sensitive luminescent protein apoaequorin, revealed circadian oscillations in free cytosolic calcium that can be phase-shifted by light-dark signals. When apoaequorin was targeted to the chloroplast, circadian chloroplast calcium rhythms were likewise observed after transfer of the seedlings to constant darkness. Circadian oscillations in free calcium concentrations can be expected to control many calcium-dependent enzymes and processes accounting for circadian outputs. Regulation of calcium flux is therefore fundamental to the organization of circadian systems.
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Affiliation(s)
- C H Johnson
- Department of Biology, Vanderbilt University, Nashville, TN 37235, USA
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19
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Haley A, Russell AJ, Wood N, Allan AC, Knight M, Campbell AK, Trewavas AJ. Effects of mechanical signaling on plant cell cytosolic calcium. Proc Natl Acad Sci U S A 1995; 92:4124-8. [PMID: 11536690 PMCID: PMC41897 DOI: 10.1073/pnas.92.10.4124] [Citation(s) in RCA: 109] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Mechanical signals are important influences on the development and morphology of higher plants. Using tobacco transformed with the Ca(2+)-sensitive luminescent protein aequorin, we recently reported the effects of mechanical signals of touch and wind on the luminescence and thus intracellular calcium of young seedlings. When mesophyll protoplasts are isolated from these transgenic tobacco plants and mechanically stimulated by swirling them in solution, cytoplasmic Ca2+ increases immediately and transiently up to 10 microM, and these transients are unaffected by an excess of EGTA in the medium. The size of the transient effect is related to the strength of swirling. Epidermal strips isolated from transgenic tobacco leaves and containing only viable guard cells and trichomes also respond to the strength of swirling in solution and can increase their cytoplasmic Ca2+ transiently up to 10 microM. Finally, the moss Physcomitrella patens containing recombinant aequorin exhibits transient increases in cytoplasmic Ca2+ up to 5 microM when swirled in solution. This effect is strongly inhibited by ruthenium red. Our data indicate that the effect of mechanical stimulation can be found in a number of different cell types and in a lower plant as well as tobacco and suggest that mechanoperception and the resulting increase in cytoplasmic Ca2+ may be widespread.
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Affiliation(s)
- A Haley
- Institute of Cell and Molecular Biology, University of Edinburgh, United Kingdom
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20
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Haley A, Richardson K, Zhan X, Morris B. Mutagenesis of the BC1 and BV1 genes of African cassava mosaic virus identifies conserved amino acids that are essential for spread. J Gen Virol 1995; 76 ( Pt 5):1291-8. [PMID: 7730816 DOI: 10.1099/0022-1317-76-5-1291] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [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: 01/26/2023] Open
Abstract
The products of three open reading frames encoded by the bipartite geminiviruses have been implicated in viral spread: AC2, BV1 and BC1. Alignment of the DNA B encoded gene products, BV1 and BC1, from African cassava mosaic virus (ACMV) with six other bipartite geminiviruses showed several highly conserved regions. Specific amino acids were selected for mutagenic studies to ascertain the tolerance of the virus to change and to identify the regions within these two proteins required for normal functioning. Various mutant DNA B constructs, and a wild-type construct, were inoculated onto three host plant species with an equivalent DNA A construct. Three of the mutant constructs were infectious on Nicotiana benthamiana and N. clevelandii, but only two induced ACMV disease symptoms on N. tabacum cv. Samsun. Sequencing of the viral DNA extracted from the sap of systemically infected plants confirmed the maintenance of introduced base changes. The amino acid at position 95 on the BV1 gene product was identified as non-essential for normal functioning of the protein. The alteration of the amino acid at position 145 in BC1 demonstrated the ability of the virus to tolerate a conservative change. The lack of tolerance to other changes in amino acids has given an indication of the importance of maintaining protein structure for these proteins to function normally.
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Affiliation(s)
- A Haley
- Plant Improvement Division, Horticulture and Food Research Institute of New Zealand Ltd, Auckland
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21
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Zhan X, Richardson KA, Haley A, Morris BA. The activity of the coat protein promoter of chloris striate mosaic virus is enhanced by its own and C1-C2 gene products. Virology 1993; 193:498-502. [PMID: 8438584 DOI: 10.1006/viro.1993.1153] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [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: 01/30/2023]
Abstract
DNA fragments from the bidirectional promoter region of the geminivirus chloris striate mosaic virus (CSMV) were cloned into the pUC18-based vector, pG1 producing transcriptional fusions with the beta-glucuronidase (GUS) gene and nopaline synthase terminator sequence. The relative activity of each promoter construct was analyzed by a GUS expression assay of extracts from Zea mays (maize) Black Mexican Sweet protoplasts coelectroporated with the GUS reporter constructs and constructs in which individual CSMV open reading frames (ORFs) were placed under control of a cauliflower mosaic virus 35 S promoter. Weak promoter activity was observed for the promoter of the C1 and C2 ORFs (C1-C2 gene) and for the promoter of the V1 ORF. The activity of these promoters was unaffected by coelectroporation with the CSMV ORF constructs. Moderate activity was observed for the promoter of the V2 ORF (coat protein gene) which was enhanced by coelectroporation of the C1-C2 ORF construct. Sequences within the C1-C2 gene responsible for transactivation of the V2 ORF promoter were mapped close to the A site of a conserved NTP-binding sequence pattern within the C2 ORF. To a lesser extent activity for the promoter of the V2 ORF was enhanced by the V2 ORF construct providing evidence for positive autoregulation of the CSMV coat protein gene.
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Affiliation(s)
- X Zhan
- Plant Improvment Division, Horticulture and Food Research Institute of NZ Ltd., Auckland
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22
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Haley A, Zhan X, Richardson K, Head K, Morris B. Regulation of the activities of African cassava mosaic virus promoters by the AC1, AC2, and AC3 gene products. Virology 1992; 188:905-9. [PMID: 1585657 DOI: 10.1016/0042-6822(92)90551-y] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.2] [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: 12/27/2022]
Abstract
DNA fragments comprising each of the promoter regions from the geminivirus African cassava mosaic virus (ACMV) were cloned into the pUC18-based vector, pG1, producing transcriptional fusions with the beta-glucuronidase gene (GUS) and nopaline synthase terminator sequence. The relative activity of each promoter construct was analyzed by a GUS expression assay of extracts from Nicotiana clevelandii protoplasts coelectroporated with the GUS reporter constructs and constructs in which individual ACMV open reading frames (ORFs) were placed under control of a cauliflower mosaic virus 35 S promoter. Results suggest repression of the AC1 gene by its gene product, which is required for ACMV DNA synthesis. The promoter activity observed for the single promoter for the DNA A genes encoding functions of spread and the regulation of replication (AC2 and AC3 ORFs) was unaffected by coelectroporation with any of the ACMV ORF constructs. Promoters for the AV1 (coat protein) gene and the two DNA B genes (BV1 and BC1) were activated by electroporation of the AC2 ORF construct. To a lesser extent promoters for the AV1 and BV1 genes were activated with the AC3 ORF construct. The same pattern of promoter repression and activation was observed when transgenic N. benthamiana plants expressing the GUS reporter constructions were inoculated with ACMV DNA A.
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Affiliation(s)
- A Haley
- Molecular Biology Group, DSIR Plant Protection, Auckland, New Zealand
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23
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Morris BA, Richardson KA, Haley A, Zhan X, Thomas JE. The nucleotide sequence of the infectious cloned DNA component of tobacco yellow dwarf virus reveals features of geminiviruses infecting monocotyledonous plants. Virology 1992; 187:633-42. [PMID: 1546458 DOI: 10.1016/0042-6822(92)90466-3] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.7] [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: 12/27/2022]
Abstract
An infectious clone of the Australian geminivirus tobacco yellow dwarf virus (TobYDV) was constructed from virus-specific double-stranded DNA isolated from infected tobacco and used to demonstrate a single-component genome. The nucleotide sequence of TobYDV DNA comprises 2580 nucleotides. TobYDV DNA has three coding regions, two in the virion sense and one in the complementary sense, homologous to those identified for other geminiviruses, particularly those infecting monocotyledonous (monocot) plants. The complementary sense coding region is comprised of two overlapping reading frames, with an intron of 86 nucleotides. Efficient splicing of the mRNA for this coding region was observed in the infected dicotyledonous (dicot) hosts bean and tobacco despite the intron having an A + U content (57%) more typical of geminiviruses of monocot plants. TobYDV encapsidates a small oligonucleotide able to prime synthesis of the complementary DNA strand in vitro. The TobYDV genome organization, low A + U intron, and encapsidated oligonucleotide primer resemble those of the monocot-infecting geminiviruses. These results strongly suggest that TobYDV is a monocot geminivirus which has become adapted to dicot hosts.
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Affiliation(s)
- B A Morris
- Molecular Biology Group, DSIR Plant Protection, Auckland, New Zealand
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24
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Zhan XC, Haley A, Richardson K, Morris B. Analysis of the potential promoter sequences of African cassava mosaic virus by transient expression of the beta-glucuronidase gene. J Gen Virol 1991; 72 ( Pt 11):2849-52. [PMID: 1940874 DOI: 10.1099/0022-1317-72-11-2849] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
DNA fragments from promoter regions of the geminivirus, African cassava mosaic virus, were cloned into pG1, a vector based on pUC18, producing transcriptional fusions with the beta-glucuronidase (GUS) gene and nopaline synthase termination sequence. The activity of each promoter construct was assessed by analysing the transient expression of GUS in Nicotiana clevelandii protoplasts. The results demonstrated that constructs containing the common region of DNA A showed much stronger promoter activity in the complementary sense than in the viral sense. These results were supported by the analysis of promoter activity in transgenic N. benthamiana plants. In comparison, in protoplasts a region upstream of the AC2 open reading frame was shown to have moderate promoter activity. Unlike DNA A, the complementary sense DNA B promoter constructs had weak activity; the viral sense DNA B promoter constructs appeared to be regulated by host factors. The implications of these results for the regulation of early and late genes are discussed.
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Affiliation(s)
- X C Zhan
- Molecular Biology Group, DSIR Plant Protection, Auckland, New Zealand
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25
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Morris B, Richardson K, Eddy P, Zhan XC, Haley A, Gardner R. Mutagenesis of the AC3 open reading frame of African cassava mosaic virus DNA A reduces DNA B replication and ameliorates disease symptoms. J Gen Virol 1991; 72 ( Pt 6):1205-13. [PMID: 2045787 DOI: 10.1099/0022-1317-72-6-1205] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Small insertions were made independently at each of four unique restriction sites on African cassava mosaic virus (ACMV) DNA A to disrupt the three overlapping complementary-sense open reading frames (ORFs) herein designated AC1, AC2 and AC3. The DNA A mutants were assayed for their infectivity by agroinoculation of monomeric constructs to Nicotiana benthamiana plants containing chromosomal insertions of ACMV DNA B. Disruption of the AC3 ORF alone resulted in a delay and amelioration of disease symptoms which correlated with reduced replication of DNA B. Normal replication of DNA A still carrying the AC3 ORF mutation was found in extracts from these plants. No ACMV DNA or symptoms were observed in corresponding inoculations with either the simultaneous disruption of the overlapping AC2 and AC3 ORFs or disruption of the AC1 ORF. Complementation by the inoculation of different mutant pairs produced a delay in disease symptoms followed by repair of mutated sites. A DNA A construct with the virus-sense AV1 (coat protein) ORF deleted was infectious producing typical ACMV disease symptoms. A similar construct with a larger deletion encompassing the complementary-sense AC3 ORF produced symptomless infections. The DNA recovered from plants revealed DNA A of normal size where the position of the deleted ORF was replaced with cloning vector DNA. Significantly reduced DNA B replication was observed for the AC3 deletion construct.
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Affiliation(s)
- B Morris
- Molecular Biology Group, DSIR, Plant Protection, Auckland, New Zealand
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Abstract
Since its description in 1981, the MAGPI procedure has rapidly assumed a major role in the repair of coronal and subcoronal hypospadias without chordee. Success with this procedure depends upon careful attention to detail and proper patient selection. Despite heeding these caveats the authors have noted occasional patients who, following completion of a MAGPI, have a disturbing "fishmouth" quality to the meatus. Herein is described a simple modification that seems to improve the cosmetic results when this situation is encountered.
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