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Hannah WB, Case LE, Smith EC, Walters C, Bali D, Kishnani PS, Koeberl DD. Screening data from 19 patients with late-onset Pompe disease for a phase I clinical trial of AAV8 vector-mediated gene therapy. JIMD Rep 2023; 64:393-400. [PMID: 37701327 PMCID: PMC10494494 DOI: 10.1002/jmd2.12391] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 08/02/2023] [Accepted: 08/08/2023] [Indexed: 09/14/2023] Open
Abstract
Late-onset Pompe disease (LOPD) is a multisystem disorder with significant myopathy. The standard treatment is enzyme replacement therapy (ERT), a therapy that is lifesaving, yet with limitations. Clinical trials have emerged for other potential treatment options, including adeno-associated virus (AAV) gene therapy. We present clinical parameters and AAV antibody titers for 19 individuals with LOPD undergoing screening for a Phase I clinical trial with an AAV serotype 8 vector targeting hepatic transduction (AAV2/8-LSPhGAA). Reported clinical parameters included GAA genotype, assessments of muscle function, upright and supine spirometry, anti-recombinant human GAA antibody titers, and biomarkers. Variability in measured parameters and phenotypes of screened individuals was evident. Eligibility criteria required that all participants have six-minute walk test (6MWT) and upright forced vital capacity (FVC) below the expected range for normal individuals, and were stably treated with ERT for >2 years. All participants had Pompe disease diagnosed by enzyme deficiency, and all had the common c.-32-13T>G LOPD pathogenic variant. Screening identified 14 patients (74%) with no or minimal detectable neutralizing antibodies against AAV8 (titer ≤1:5). 6MWT distance varied significantly (percent of expected distance ranging from 24% to 91% with an average of 60 and standard deviation of 21). Upright FVC percent predicted ranged from 35% predicted to 91% predicted with an average of 66 and standard deviation of 18. None of the participants had significantly elevated alanine transaminase, which has been associated with LOPD and could complicate screening for hepatitis related to AAV gene therapy. We review the parameters considered in screening for eligibility for a clinical trial of AAV8 vector-mediated gene therapy.
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Affiliation(s)
- William B. Hannah
- Division of Medical Genetics, Department of PediatricsDuke University School of MedicineDurhamNorth CarolinaUSA
| | - Laura E. Case
- Doctor of Physical Therapy Division, Department of OrthopedicsDuke University School of MedicineDurhamNorth CarolinaUSA
| | - Edward C. Smith
- Division of Neurology, Department of PediatricsDuke University School of MedicineDurhamNorth CarolinaUSA
| | - Crista Walters
- Division of Medical Genetics, Department of PediatricsDuke University School of MedicineDurhamNorth CarolinaUSA
| | - Deeksha Bali
- Division of Medical Genetics, Department of PediatricsDuke University School of MedicineDurhamNorth CarolinaUSA
| | - Priya S. Kishnani
- Division of Medical Genetics, Department of PediatricsDuke University School of MedicineDurhamNorth CarolinaUSA
| | - Dwight D. Koeberl
- Division of Medical Genetics, Department of PediatricsDuke University School of MedicineDurhamNorth CarolinaUSA
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2
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Smith EC, Hopkins S, Case LE, Xu M, Walters C, Dearmey S, Han SO, Spears TG, Chichester JA, Bossen EH, Hornik CP, Cohen JL, Bali D, Kishnani PS, Koeberl DD. Phase I study of liver depot gene therapy in late-onset Pompe disease. Mol Ther 2023; 31:1994-2004. [PMID: 36805083 PMCID: PMC10362382 DOI: 10.1016/j.ymthe.2023.02.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 01/03/2023] [Accepted: 02/16/2023] [Indexed: 02/21/2023] Open
Abstract
Gene therapy with an adeno-associated virus serotype 8 (AAV8) vector (AAV8-LSPhGAA) could eliminate the need for enzyme replacement therapy (ERT) by creating a liver depot for acid α-glucosidase (GAA) production. We report initial safety and bioactivity of the first dose (1.6 × 1012 vector genomes/kg) cohort (n = 3) in a 52-week open-label, single-dose, dose-escalation study (NCT03533673) in patients with late-onset Pompe disease (LOPD). Subjects discontinued biweekly ERT after week 26 based on the detection of elevated serum GAA activity and the absence of clinically significant declines per protocol. Prednisone (60 mg/day) was administered as immunoprophylaxis through week 4, followed by an 11-week taper. All subjects demonstrated sustained serum GAA activities from 101% to 235% of baseline trough activity 2 weeks following the preceding ERT dose. There were no treatment-related serious adverse events. No subject had anti-capsid T cell responses that decreased transgene expression. Muscle biopsy at week 24 revealed unchanged muscle glycogen content in two of three subjects. At week 52, muscle GAA activity for the cohort was significantly increased (p < 0.05). Overall, these initial data support the safety and bioactivity of AAV8-LSPhGAA, the safety of withdrawing ERT, successful immunoprophylaxis, and justify continued clinical development of AAV8-LSPhGAA therapy in Pompe disease.
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Affiliation(s)
- Edward C Smith
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA
| | - Sam Hopkins
- Asklepios Biopharmaceutical, Inc. (Askbio), Durham, NC, USA
| | - Laura E Case
- Department of Orthopedics, Duke University School of Medicine, Durham, NC, USA
| | - Ming Xu
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA
| | - Crista Walters
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA
| | - Stephanie Dearmey
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA
| | - Sang-Oh Han
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA
| | - Tracy G Spears
- Clinical Trials Statistics, Duke Clinical Research Institute, Durham, NC, USA
| | - Jessica A Chichester
- Immunology Core, Gene Therapy Program, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Edward H Bossen
- Department of Pathology, Duke University Medical Center, Durham, NC, USA
| | - Christoph P Hornik
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA
| | - Jennifer L Cohen
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA
| | - Deeksha Bali
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA
| | - Priya S Kishnani
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA
| | - Dwight D Koeberl
- Department of Pediatrics, Duke University School of Medicine, Durham, NC, USA.
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Yusoff A, Davies EA, Burberry DJ, Jones N, Walters C, Beynon Howells C, Davies D, Quinn P. 1103 AN EVALUATION OF A GERIATRICIAN-LED ACUTE MEDICAL ADMISSION UNIT AT MORRISTON HOSPITAL, SWANSEA. Age Ageing 2023. [DOI: 10.1093/ageing/afac322.088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Abstract
Introduction
The medical intake at Morriston Hospital is accepted on two units; Rapid Assessment Unit (RAU) and Acute Medical Assessment Unit. Both were acute physician-led until July 2021
Method
(Phase 1). From July 2021, RAU became geriatrician-led (Phase 2). This evaluation concerns the performance of RAU.
Phase 1 (Acute Physician-Led Unit) Between 01/08/2020-30/06/2021, there were 3102 admissions with a median length of stay (LOS) of 2 days on RAU. 37.2% of patients were discharged directly from the unit. (SBUHB data). A detailed analysis of 496 patients consecutively assessed between November 2020–January 2021 showed a median LOS on RAU of 1, 28.8% were discharged directly from RAU. Overall health board (HB) median LOS for the cohort was 7. In over 70 years, median LOS on RAU was 1, overall HB LOS 9.
Phase 2 (Geriatrician-Led Unit) 1237 patients were assessed July-December 2021, with a median LOS of 2 days. 42.8% of patients were discharged from RAU. (SBUHB data). A detailed analysis of 566 patients consecutively assessed between September-November 2021 showed a median LOS on RAU of 2, 41.7% discharged directly from RAU. Overall HB median LOS for the entire cohort was 5. For the > 70 years, median LOS on RAU was 2, overall HB LOS was 7. Patient flow through assessment areas is dependent on the function of downstream medical wards. Mean LOS within medicine at Morriston increased 1.5 days between Phase 1 and Phase 2.
Results
Acute geriatricians have delivered the 72hr LOS standard that SBUHB has set for assessment areas. The unit has achieved a reduction in overall LOS for the cohort of patients evaluated (p<.01), especially for the > 70 years (p=.007).
Conclusion
This data supported a change in practice; RAU has taken a frailty specific intake since January 2022.
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Affiliation(s)
- A Yusoff
- Morriston Hospital, Swansea Bay University Health Board (SBUHB) Department of Geriatric Medicine,
| | - E A Davies
- Morriston Hospital, Swansea Bay University Health Board (SBUHB) Department of Geriatric Medicine,
| | - D J Burberry
- Morriston Hospital, Swansea Bay University Health Board (SBUHB) Department of Geriatric Medicine,
| | - N Jones
- Morriston Hospital, Swansea Bay University Health Board (SBUHB) Department of Geriatric Medicine,
| | - C Walters
- Morriston Hospital, Swansea Bay University Health Board (SBUHB) Department of Geriatric Medicine,
| | - C Beynon Howells
- Morriston Hospital, Swansea Bay University Health Board (SBUHB) Department of Geriatric Medicine,
| | - D Davies
- Morriston Hospital, Swansea Bay University Health Board (SBUHB) Department of Geriatric Medicine,
| | - P Quinn
- Morriston Hospital, Swansea Bay University Health Board (SBUHB) Department of Geriatric Medicine,
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Ghodsian M, Lee T, Nguyen H, Walters C, He A, McCarthy M, Ihdayhid A, Dwivedi G. Prevalence and Clinical Significance of Incidental Cardiac Uptake of Technetium99m Hydroxydiphosphate (Tc99m-HDP) on Bone Scintigraphy. Heart Lung Circ 2022. [DOI: 10.1016/j.hlc.2022.06.274] [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: 10/16/2022]
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5
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Koeberl DD, Case LE, Desai A, Smith EC, Walters C, Han SO, Thurberg BL, Young SP, Bali D, Kishnani PS. Improved muscle function in a phase I/II clinical trial of albuterol in Pompe disease. Mol Genet Metab 2020; 129:67-72. [PMID: 31839530 DOI: 10.1016/j.ymgme.2019.12.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 12/04/2019] [Accepted: 12/08/2019] [Indexed: 01/21/2023]
Abstract
This 24-week, Phase I/II, double-blind, randomized, placebo-controlled study investigated the safety and efficacy of extended-release albuterol in late-onset Pompe disease stably treated with enzyme replacement therapy at the standard dose for 4.9 (1.0-9.4) years and with no contraindications to intake of albuterol. Twelve of 13 participants completed the study. No serious adverse events were related to albuterol, and transient minor drug-related adverse events included muscle spasms and tremors. For the albuterol group, forced vital capacity in the supine position increased by 10% (p < .005), and forced expiratory volume in one second increased by 8% (p < .05); the six-minute walk test increased 25 m (p < .05; excluding one participant unable to complete muscle function testing); the Gross Motor Function Measure increased by 8% (p < .005) with the greatest increases in the Standing (18%; p < .05) and Walking, Running, and Jumping (11%; p < .005) subtests. No significant improvements would be expected in patients with late-onset Pompe disease who were stably treated with enzyme replacement therapy. The placebo group demonstrated no significant increases in performance on any measure. These data support a potential benefit of extended-release albuterol as adjunctive therapy in carefully selected patients with late-onset Pompe disease based on ability to take albuterol on enzyme replacement therapy (NCT01885936).
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Affiliation(s)
- Dwight D Koeberl
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, United States of America; Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC 27710, United States of America.
| | - Laura E Case
- Department of Physical and Occupational Therapy, Duke University School of Medicine, Durham, NC 27710, United States of America
| | - Ankit Desai
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, United States of America
| | - Edward C Smith
- Division of Neurology, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, United States of America
| | - Crista Walters
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, United States of America
| | - Sang-Oh Han
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, United States of America
| | | | - Sarah P Young
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, United States of America
| | - Deeksha Bali
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, United States of America
| | - Priya S Kishnani
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, United States of America; Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC 27710, United States of America
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Alexander K, Banerjee S, Walters C, Staley J, Parker P. EXPLORATION OF ONCOLOGY HEALTHCARE PROVIDERS’ KNOWLEDGE OF LESBIAN, GAY, BISEXUAL AND TRANSGENDER HEALTHCARE. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.2602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | | | | | - J Staley
- Memorial Sloan Kettering Cancer Center
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7
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Koeberl DD, Case LE, Smith EC, Walters C, Han SO, Li Y, Chen W, Hornik CP, Huffman KM, Kraus WE, Thurberg BL, Corcoran DL, Bali D, Bursac N, Kishnani PS. Correction of Biochemical Abnormalities and Improved Muscle Function in a Phase I/II Clinical Trial of Clenbuterol in Pompe Disease. Mol Ther 2018; 26:2304-2314. [PMID: 30025991 PMCID: PMC6127508 DOI: 10.1016/j.ymthe.2018.06.023] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 06/22/2018] [Accepted: 06/25/2018] [Indexed: 01/10/2023] Open
Abstract
This 52-week, phase I/II double-blind, randomized, placebo-controlled study investigated the novel use of clenbuterol in late-onset Pompe disease (LOPD) stably treated with ERT. Eleven of thirteen participants completed the study. No serious adverse events were related to clenbuterol, and transient minor adverse events included mild elevations of creatine kinase, muscle spasms, and tremors. At week 52, the 6-min walk test distance increased by a mean of 16 m (p = 0.08), or a mean of 3% of predicted performance (p = 0.03), and the maximum inspiratory pressure increased 8% (p = 0.003) for the clenbuterol group. The quick motor function test score improved by a mean of seven points (p = 0.007); and the gait, stairs, gower, chair test improved by a mean of two points (p = 0.004). Clenbuterol decreased glycogen content in the vastus lateralis by 50% at week 52. Transcriptome analysis revealed more normal muscle gene expression for 38 of 44 genes related to Pompe disease following clenbuterol. The placebo group demonstrated no significant changes over the course of the study. This study provides initial evidence for safety and efficacy of adjunctive clenbuterol in patients with LOPD (NCT01942590).
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Affiliation(s)
- Dwight D Koeberl
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, USA.
| | - Laura E Case
- Department of Physical and Occupational Therapy, Duke University School of Medicine, Durham, NC 27710, USA
| | - Edward C Smith
- Division of Neurology, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, USA
| | - Crista Walters
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, USA
| | - Sang-Oh Han
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, USA
| | - Yanzhen Li
- Department of Biomedical Engineering, Duke University School of Medicine, Durham, NC 27710, USA
| | - Wei Chen
- Duke Center for Genomic and Computational Biology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Christoph P Hornik
- Division of Critical Care Medicine, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, USA
| | - Kim M Huffman
- Division of Rheumatology and Immunology, Department of Medicine, Duke University School of Medicine, Durham, NC 27710, USA
| | - William E Kraus
- Division of Cardiology, Department of Medicine; Duke University School of Medicine, Durham, NC 27710, USA
| | | | - David L Corcoran
- Duke Center for Genomic and Computational Biology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Deeksha Bali
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, USA
| | - Nenad Bursac
- Department of Biomedical Engineering, Duke University School of Medicine, Durham, NC 27710, USA
| | - Priya S Kishnani
- Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710, USA
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8
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Ben-Hasan A, Walters C, Christensen V, Al-Husaini M, Al-Foudari H. Is reduced freshwater flow in Tigris-Euphrates rivers driving fish recruitment changes in the Northwestern Arabian Gulf? Mar Pollut Bull 2018; 129:1-7. [PMID: 29680525 DOI: 10.1016/j.marpolbul.2018.02.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 01/29/2018] [Accepted: 02/05/2018] [Indexed: 06/08/2023]
Abstract
Like fishing, natural regime shifts and human-induced environmental changes are often equally important factors in driving fish stock declines. In the Northwestern Arabian Gulf, many fish stocks are declining, raising questions about the reduction in the flow of Tigris-Euphrates rivers. Here we investigate the relationship between Tigris-Euphrates river flow and the estimated recruitment patterns from assessment models. We found a positive correlation between the estimated finfish recruitment trends and the flow of Tigris-Euphrates rivers. Additionally, the assessment model showed remarkably weak compensation ratio, likely indicating a reduction in the productivity of nursery area of two finfish stocks but not in that of the crustacean stock. Our investigation would be very critical in providing guidelines to the government agencies in the Northwestern Arabian Gulf as well as countries of Tigris-Euphrates basins: to consider the impacts associated with reductions in Tigris-Euphrates river flows on the ecosystem services of the region.
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Affiliation(s)
- A Ben-Hasan
- Institute for the Oceans and Fisheries, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
| | - C Walters
- Institute for the Oceans and Fisheries, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - V Christensen
- Institute for the Oceans and Fisheries, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - M Al-Husaini
- Ecosystem-based Management of Marine Resources, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, PO Box 24885, 13109 Safat, Kuwait
| | - H Al-Foudari
- Ecosystem-based Management of Marine Resources, Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, PO Box 24885, 13109 Safat, Kuwait
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9
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Rairikar M, Kazi ZB, Desai A, Walters C, Rosenberg A, Kishnani PS. High dose IVIG successfully reduces high rhGAA IgG antibody titers in a CRIM-negative infantile Pompe disease patient. Mol Genet Metab 2017; 122. [PMID: 28648664 PMCID: PMC5612830 DOI: 10.1016/j.ymgme.2017.05.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Alglucosidase alfa (rhGAA) has altered the course of an otherwise fatal outcome in classic infantile Pompe disease (IPD), which presents with cardiomyopathy and severe musculoskeletal involvement. However, the response to therapy is determined by several factors including the development of high and sustained antibody titers (HSAT) to rhGAA. Cross-reactive immunologic material (CRIM) negative patients are at the highest risk for development of HSAT. Immune tolerance induction (ITI) with methotrexate, rituximab, and intravenous immunoglobulin (IVIG) has been largely successful in preventing the immune response and in achieving tolerance when done in conjunction with enzyme replacement therapy (ERT) initiation. Reducing antibody titers in cases with an entrenched immune response remains a challenge in the field despite the use of multiple immunomodulatory agents. Success has been shown with addition of bortezomib to the ITI regimen, yet the prolonged course and potential risks with the use of such agents' demands caution. We present here a 7-year-old CRIM-negative IPD patient who was not successfully tolerized by an ITI regimen with rituximab, methotrexate, and IVIG due to intolerability to the regimen and recurrent infections. She went on to develop HSAT, with significant clinical decline, loss of all motor abilities, and a fragile medical state, which made it challenging to institute the bortezomib based regimen to reduce HSAT. She had severe developmental delay, respiratory failure with invasive ventilation and tracheostomy, persistent hypotonia, ptosis of eyelids, diffuse severe osteopenia, contractures, and was completely G-tube fed. As a rescue mechanism, we treated her with high dose and high frequency IVIG in an attempt to reduce rhGAA IgG antibody titers (antibody titers; titers). Her titers saw a steady decline on weekly IVIG doses at 1g/kg for 20weeks. Subsequently when the IVIG regimen was altered to 1g/kg every month, rising titers were detected and therefore the regimen was changed to a biweekly regimen. High dose IVIG resulted in an eightfold decrease in antibody titers. Clinically, she showed improvement with partial recovery of previously lost motor abilities, especially hand movements and better head and neck control than before. The regimen was safely tolerated with no hospitalizations. The effectiveness of IVIG as a single agent, in this case with multiple comorbidities and fragile clinical status, was lifesaving and may represent an effective, perhaps lifesaving rescue approach to reduce antibody titers.
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Affiliation(s)
- Mugdha Rairikar
- Division of Medical Genetics, Department of Pediatrics, Duke University Medical Center, Durham, NC, USA
| | - Zoheb B Kazi
- Division of Medical Genetics, Department of Pediatrics, Duke University Medical Center, Durham, NC, USA
| | - Ankit Desai
- Division of Medical Genetics, Department of Pediatrics, Duke University Medical Center, Durham, NC, USA
| | - Crista Walters
- Division of Medical Genetics, Department of Pediatrics, Duke University Medical Center, Durham, NC, USA
| | - Amy Rosenberg
- Division of Therapeutic Proteins, Office of Biotechnology Products, Center for Drug Evaluation and Research, United States Food and Drug Administration, Bethesda, MD, USA
| | - Priya S Kishnani
- Division of Medical Genetics, Department of Pediatrics, Duke University Medical Center, Durham, NC, USA.
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Airhart S, Walters C, Verlinden N, Correa P, Franco V, Raina A, Benza R. Safety of Outpatient Transition from Intravenous Treprostinil to an Oral Prostacyclin Analog Using Remote Wireless Hemodynamic Monitoring. J Heart Lung Transplant 2017. [DOI: 10.1016/j.healun.2017.01.199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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11
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Olson RE, Leeper RJ, Kline JL, Zylstra AB, Yi SA, Biener J, Braun T, Kozioziemski BJ, Sater JD, Bradley PA, Peterson RR, Haines BM, Yin L, Berzak Hopkins LF, Meezan NB, Walters C, Biener MM, Kong C, Crippen JW, Kyrala GA, Shah RC, Herrmann HW, Wilson DC, Hamza AV, Nikroo A, Batha SH. First Liquid Layer Inertial Confinement Fusion Implosions at the National Ignition Facility. Phys Rev Lett 2016; 117:245001. [PMID: 28009190 DOI: 10.1103/physrevlett.117.245001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Indexed: 06/06/2023]
Abstract
The first cryogenic deuterium and deuterium-tritium liquid layer implosions at the National Ignition Facility (NIF) demonstrate D_{2} and DT layer inertial confinement fusion (ICF) implosions that can access a low-to-moderate hot-spot convergence ratio (12<CR<25). Previous ICF experiments at the NIF utilized high convergence (CR>30) DT ice layer implosions. Although high CR is desirable in an idealized 1D sense, it amplifies the deleterious effects of asymmetries. To date, these asymmetries prevented the achievement of ignition at the NIF and are the major cause of simulation-experiment disagreement. In the initial liquid layer experiments, high neutron yields were achieved with CRs of 12-17, and the hot-spot formation is well understood, demonstrated by a good agreement between the experimental data and the radiation hydrodynamic simulations. These initial experiments open a new NIF experimental capability that provides an opportunity to explore the relationship between hot-spot convergence ratio and the robustness of hot-spot formation during ICF implosions.
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Affiliation(s)
- R E Olson
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - R J Leeper
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - J L Kline
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - A B Zylstra
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - S A Yi
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - J Biener
- Lawrence Livermore National Laboratory (LLNL), Livermore, California 94551, USA
| | - T Braun
- Lawrence Livermore National Laboratory (LLNL), Livermore, California 94551, USA
| | - B J Kozioziemski
- Lawrence Livermore National Laboratory (LLNL), Livermore, California 94551, USA
| | - J D Sater
- Lawrence Livermore National Laboratory (LLNL), Livermore, California 94551, USA
| | - P A Bradley
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - R R Peterson
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - B M Haines
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - L Yin
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - L F Berzak Hopkins
- Lawrence Livermore National Laboratory (LLNL), Livermore, California 94551, USA
| | - N B Meezan
- Lawrence Livermore National Laboratory (LLNL), Livermore, California 94551, USA
| | - C Walters
- Lawrence Livermore National Laboratory (LLNL), Livermore, California 94551, USA
| | - M M Biener
- Lawrence Livermore National Laboratory (LLNL), Livermore, California 94551, USA
| | - C Kong
- General Atomics (GA), San Diego, California 92186, USA
| | - J W Crippen
- General Atomics (GA), San Diego, California 92186, USA
| | - G A Kyrala
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - R C Shah
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - H W Herrmann
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - D C Wilson
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
| | - A V Hamza
- Lawrence Livermore National Laboratory (LLNL), Livermore, California 94551, USA
| | - A Nikroo
- Lawrence Livermore National Laboratory (LLNL), Livermore, California 94551, USA
| | - S H Batha
- Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87185, USA
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Pickworth LA, Hammel BA, Smalyuk VA, MacPhee AG, Scott HA, Robey HF, Landen OL, Barrios MA, Regan SP, Schneider MB, Hoppe M, Kohut T, Holunga D, Walters C, Haid B, Dayton M. Measurement of Hydrodynamic Growth near Peak Velocity in an Inertial Confinement Fusion Capsule Implosion using a Self-Radiography Technique. Phys Rev Lett 2016; 117:035001. [PMID: 27472117 DOI: 10.1103/physrevlett.117.035001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Indexed: 06/06/2023]
Abstract
First measurements of hydrodynamic growth near peak implosion velocity in an inertial confinement fusion (ICF) implosion at the National Ignition Facility were obtained using a self-radiographing technique and a preimposed Legendre mode 40, λ=140 μm, sinusoidal perturbation. These are the first measurements of the total growth at the most unstable mode from acceleration Rayleigh-Taylor achieved in any ICF experiment to date, showing growth of the areal density perturbation of ∼7000×. Measurements were made at convergences of ∼5 to ∼10× at both the waist and pole of the capsule, demonstrating simultaneous measurements of the growth factors from both lines of sight. The areal density growth factors are an order of magnitude larger than prior experimental measurements and differed by ∼2× between the waist and the pole, showing asymmetry in the measured growth factors. These new measurements significantly advance our ability to diagnose perturbations detrimental to ICF implosions, uniquely intersecting the change from an accelerating to decelerating shell, with multiple simultaneous angular views.
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Affiliation(s)
- L A Pickworth
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - B A Hammel
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - V A Smalyuk
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - A G MacPhee
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - H A Scott
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - H F Robey
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - O L Landen
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M A Barrios
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - S P Regan
- University of Rochester, Laboratory for Laser Energetics, Rochester, New York, USA
| | - M B Schneider
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M Hoppe
- General Atomics, San Diego, California, USA
| | - T Kohut
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - D Holunga
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - C Walters
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - B Haid
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
| | - M Dayton
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808, USA
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Pickworth LA, Hammel BA, Smalyuk VA, MacPhee AG, Scott HA, Robey HF, Landen OL, Barrios MA, Regan SP, Schneider MB, Jr MH, Kohut T, Holunga D, Walters C, Haid B, Dayton M. Measurement of inflight shell areal density near peak velocity using a self backlighting technique. ACTA ACUST UNITED AC 2016. [DOI: 10.1088/1742-6596/717/1/012044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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14
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Young R, McLellan T, Walters C. M30 Respiratory Skills Course for Post-graduate Medical Trainees; Inspiring Future Respiratory Trainees. Thorax 2015. [DOI: 10.1136/thoraxjnl-2015-207770.457] [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: 11/03/2022]
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15
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Galloway-Blake K, Reid M, Walters C, Jaggon J, Lee MG. Clinical Factors Associated with Morbidity and Mortality in Patients Admitted with Sickle Cell Disease. W INDIAN MED J 2014; 63:711-6. [PMID: 25867578 PMCID: PMC4668979 DOI: 10.7727/wimj.2014.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [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: 02/03/2014] [Accepted: 02/28/2014] [Indexed: 02/06/2023]
Abstract
OBJECTIVE To determine the clinical factors associated with the length of hospitalization and mortality in patients with sickle cell disease (SCD). METHODS All patients with SCD admitted to the medical wards of the University Hospital of the West Indies, Jamaica, over a five-year period, January 1 to December 31, 2010, were reviewed. Data were extracted from hospital charts and comprised demographic and clinical information, investigations, interventions, duration of stay, pathological data and outcomes. RESULTS There were 105 patients reviewed; 84% were genotype Hb SS. Females accounted for 59% and males 41%. Overall mean age was 32.5 years (SD 13.7, range 12-66 years). The mean length of hospitalization was 10.2 days (SD 10.9, range 1-84 days). The main admission diagnoses were painful crisis, acute chest syndrome, severe anaemia, sepsis, hepatic sequestration, congestive cardiac failure and renal failure. The mean value for the following laboratory investigations were: haemoglobin 7.7 g/dL (SD 2.8), total white blood cell count 21.7 x 109/L (SD 14.2), platelet count 320 x 109/L (SD 191.9), blood urea 9.8 mmol/L (SD 11.9) and serum creatinine 198 umol/L (SD 267.9). Medical interventions included: blood transfusions in 20.9%, 55% received antibiotics and 74% received narcotic analgesia. There were 40 deaths with four autopsies done. The mortality rate for SCD was 38%. There were 189 repeat SCD admissions. CONCLUSION Sickle cell disease still carries a high morbidity and mortality in patients admitted to hospital. Recurrent admissions are a concern, as they impact on patient's morbidity and quality of life.
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Affiliation(s)
- K Galloway-Blake
- Department of Medicine, The University of the West Indies, Kingston 7, Jamaica, West Indies
| | - M Reid
- Tropical Medicine Research Institute (Sickle Cell Unit), The University of the West Indies, Kingston 7, Jamaica, West Indies
| | - C Walters
- Faculty of Medical Sciences, The University of the West Indies, Kingston 7, Jamaica, West Indies
| | - J Jaggon
- Department of Pathology, The University of the West Indies, Kingston 7, Jamaica, West Indies
| | - M G Lee
- Department of Medicine, The University of the West Indies, Kingston 7, Jamaica, West Indies.
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Nitti VW, Chapple CR, Walters C, Blauwet MB, Herschorn S, Milsom I, Auerbach S, Radziszewski P. Safety and tolerability of the β3 -adrenoceptor agonist mirabegron, for the treatment of overactive bladder: results of a prospective pooled analysis of three 12-week randomised Phase III trials and of a 1-year randomised Phase III trial. Int J Clin Pract 2014; 68:972-85. [PMID: 24703195 DOI: 10.1111/ijcp.12433] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
AIMS To evaluate the safety and tolerability of the β3 -adrenoceptor agonist, mirabegron, in patients with overactive bladder (OAB). METHODS Tolerability and safety data from three 12-week, randomised, placebo-controlled, double-blind, Phase III trials (Studies 046, 047 and 074) were pooled by treatment group. The three studies were of a similar design, although the assessed doses of mirabegron [25, 50 or 100 mg once daily (qd)] varied, and tolterodine extended release (ER) 4 mg was included as an active-control arm in Study 046 only. Tolerability and safety data from a 1-year, randomised, double-blind, Phase III trial (Study 049) are also presented. Safety variables included the incidence and severity of treatment-emergent adverse events (TEAEs), vital signs and electrocardiogram data. RESULTS Mirabegron (25, 50 or 100 mg qd) was safe and well-tolerated in patients with OAB over 12-week (n = 2736) and 1-year (n = 1632) periods. The incidence of TEAEs and treatment discontinuations as a result of TEAEs was low; the majority were mild in severity and few were serious. Hypertension, nasopharyngitis and urinary tract infection were the most common TEAEs with mirabegron. The mirabegron tolerability profile was similar to that seen with placebo and tolterodine ER 4 mg, except for dry mouth, which occurred, on average, five times less frequently with mirabegron than tolterodine ER 4 mg. In the pooled 12-week analysis, mirabegron 50 mg was associated with placebo-adjusted mean increases of 0.4-0.6 mmHg in blood pressure and approximately one beat per minute in pulse rate, both reversible upon treatment discontinuation. The incidence of Major Adverse Cardiovascular Events as adjudicated by an independent cardiovascular committee was low and similar across treatment groups. CONCLUSION The favourable tolerability profile of mirabegron in patients with OAB may allow improved treatment compliance compared with antimuscarinics, with important implications for patient outcomes.
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Affiliation(s)
- V W Nitti
- Department of Urology, NYU Langone Medical Center, New York, NY, USA
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17
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Erickson B, Martin J, Shah M, Fauci J, Daily L, Pasko D, Walters C, Leath C, Straughn J. Abstract 5: Factors leading to racial disparities in treatment and outcomes of epithelial ovarian cancer. Gynecol Oncol 2013. [DOI: 10.1016/j.ygyno.2013.04.035] [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: 10/26/2022]
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18
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Martin J, Shah M, Erickson B, Daily L, Pasko D, Walters C, Fauci J, Bevis K. Platinum dosing for epithelial ovarian cancer: Is it appropriate to use actual body weight? Gynecol Oncol 2013. [DOI: 10.1016/j.ygyno.2013.04.355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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19
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Erickson B, Martin J, Shah M, Fauci J, Daily L, Pasko D, Walters C, Leath C, Straughn J. Factors leading to racial disparities in treatment and outcomes of epithelial ovarian cancer. Gynecol Oncol 2013. [DOI: 10.1016/j.ygyno.2013.04.329] [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: 10/26/2022]
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20
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Walters C, Straughn J, Landen C, Estes J, Huh W, Kim K. Port-site metastases after robotic surgery for gynecologic malignancy. Gynecol Oncol 2013. [DOI: 10.1016/j.ygyno.2013.04.447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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21
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Alfred R, Chin SN, Williams E, Walters C, Barton EN, Shah D. The prevalence and significance of oestrogen receptor (ER) positivity in breast cancer at the University Hospital of the West Indies, Jamaica. W INDIAN MED J 2012; 61:795-801. [PMID: 23757900] [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: 06/02/2023]
Abstract
OBJECTIVE To identify the prevalence of oestrogen receptor (ER) positivity, and determine the relationship of ER status with patient and tumour characteristics, in patients with breast cancer SUBJECTS AND METHODS A retrospective review was conducted regarding the prevalence and clinical significance of ER in patients with breast cancer at the University Hospital of the West Indies (UHWI). Oestrogen receptor status results of 243 patients treated at UHWI were collected for the period January 1, 2002 to December 31, 2009. One hundred and ninety-nine were available for review. RESULTS Oestrogen receptor status was positive in 125 (63%) and negative in 74 (37%) patients. Mean age at diagnosis was 52.6 +/- 13.0 years for the ER positive group and 58.5 +/- 14.23 years for the ER negative group. Postmenopausal women accounted for 55.2% and 64.9% of the ER positive and negative groups, respectively. Mean BMI was 28.0 kg/m2 and 29.6 kg/m2 for the ER positive and negative groups, respectively. Menarche occurred mainly between ages 12 and 13 years for both groups. Mean age at 1st parity was 23.4 years for the ER positive and 21.4 years for the ER negative group with median parity of two for both groups. The most prevalent risk factors were oral contraceptive pill (OCP) use (24.3% for the ER positive group, 17.1% for the ER negative group), family history of breast cancer (12.0%; 13.4%) and previous smoking (8.4%; 6.9%). Tumour node metastasis (TNM) stage was Stage II in most cases (46%; 49%). Infiltrating ductal histology was most common (81.5%; 87.7%). Her 2/ neu status was negative for most patients (91.3%; 91.5%). Most patients were disease free (77.6%; 70.0%) after an average follow-up period of 3.5 years. More persons in the ER negative group had locoregional recurrence (8%) and metastases (22%). CONCLUSIONS Oestrogen receptor positive cohort was more prevalent. The ER negative group was older (p = 0.003).
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Affiliation(s)
- R Alfred
- Department of Medicine, Faculty of Medical Sciences, The University of the West Indies, Kingston 7, Jamaica, West Indies.
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Walters C, Connor M, Shine M, Whitworth J, Fauci J, Boone J, Bevis K, Straughn J. Platinum sensitivity in advanced uterine papillary serous carcinoma. Gynecol Oncol 2012. [DOI: 10.1016/j.ygyno.2011.12.373] [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: 11/15/2022]
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23
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Andrews M, Jenkins S, Walters C, Marriott C. Effect of S-Carboxymethylcysteine, N-Acetylcysteine and Bromhexine Hydrochloride on Mucus Secretion in Rat Isolated Trachea. J Pharm Pharmacol 2011. [DOI: 10.1111/j.2042-7158.1986.tb14349.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M Andrews
- Department of Pharmacy, Brighton Polytechnic, Moulsecoomb, Brighton BN2 4GJ
| | - S Jenkins
- Department of Pharmacy, Brighton Polytechnic, Moulsecoomb, Brighton BN2 4GJ
| | - C Walters
- Department of Pharmacy, Brighton Polytechnic, Moulsecoomb, Brighton BN2 4GJ
| | - C Marriott
- Department of Pharmacy, Brighton Polytechnic, Moulsecoomb, Brighton BN2 4GJ
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Ballesteros D, Estrelles E, Walters C, Ibars AM. Effect of storage temperature on green spore longevity for the ferns Equisetum ramosissimum and Osmunda regalis. Cryo Letters 2011; 32:89-98. [PMID: 21766138] [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] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Green spores of ferns lose viability quickly, and need specialized treatment for long-term conservation in germplasm banks. Dry storage at different temperatures was studied in green spores of Osmunda regalis and Equisetum ramosissimum. Changes in germination percentage, time to 50 percent of maximum germination (T50) and tendency for normal growth of the gametophyte were assayed during 24 months of storage. Spores stored at 25 degree C died within 1 month. Spores stored at 4 degree C maintained high viability for about 3 months, and then aging was evident by a decrease of final germination percentage, an increase in T50, and abnormal development of the gametophyte. Germination of spores stored at -25 degree C was highly variable during the storage period. Spores cryopreserved at -80 degree C and -196 degree C maintained high viability, rapid germination and normal growth throughout the study period. Cryopreservation of green spores is a feasible method to preserve viability and ensure normal gametophyte development for several years.
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Affiliation(s)
- D Ballesteros
- Banco de Germoplasma. Jardi Botanic de la Universitat de Valencia-ICBiBE, Valencia, Spain.
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Hodson DJ, Townsend J, Gregory SJ, Walters C, Tortonese DJ. Role of prolactin in the gonadotroph responsiveness to gonadotrophin-releasing hormone during the equine annual reproductive cycle. J Neuroendocrinol 2010; 22:509-17. [PMID: 20236228 DOI: 10.1111/j.1365-2826.2010.01986.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A combined suppressive effect of prolactin (PRL) and dopamine on the secretion of luteinising hormone (LH) at the level of the pituitary gland has been identified in sheep, a short-day breeder. However, little is known about the role of PRL in the intra-pituitary regulation of the gonadotrophic axis in long-day breeders. In the present study, we investigated the effects of PRL on LH and follicle-stimulating hormone (FSH) secretion during the equine annual reproductive cycle. Horse pituitaries were obtained during the breeding season (BS) and nonbreeding season (NBS). Cells were dispersed, plated to monolayer cultures and assigned to one of the following specific treatments: (i) medium (Control); (ii) rat PRL (rPRL); (iii) thyrotrophin-releasing hormone (TRH); (iv) bromocriptine (Br); and (v) Br + rPRL. Gonadotrophin-releasing hormone (GnRH) dose-dependently stimulated LH release during the BS and NBS. During the BS, neither rPRL nor TRH affected the LH response to GnRH, but Br significantly (P < 0.01) enhanced both basal and GnRH-stimulated LH release through a mechanism that did not involve alterations in the concentrations of PRL. However, rPRL prevented the Br-induced increase in basal and GnRH-stimulated LH output, and suppressed LH below basal values (P < 0.05). Conversely, during the NBS, no significant effects of treatments were observed. Interestingly, at this time of year, the incidence of pituitary gap junctions within the pars distalis decreased by 50% (P < 0.01). By contrast to the effects on LH, no treatment effects were detected on the FSH response to GnRH, which was only apparent during the NBS. These results reveal no direct effects of PRL but an interaction between PRL and dopamine in the inhibitory regulation of LH, but not FSH, release at the level of the pituitary in the horse, and a modulatory role of season/photoperiod associated with alterations in folliculostellate cell-derived gap junctions.
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Affiliation(s)
- D J Hodson
- Department of Anatomy, University of Bristol, Bristol, England, UK
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Keller J, Dolce C, Walters C, Stefanidis D, Heath J, Peindl R, Iannitti D, Heniford B. 216. Acellular Human Dermis: Effects of Bacterial Exposure on Allograft Integrity in a Rat Ventral Hernia Model. J Surg Res 2009. [DOI: 10.1016/j.jss.2008.11.258] [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: 10/21/2022]
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Merritt LL, Martin BR, Walters C, Lichtman AH, Damaj MI. The endogenous cannabinoid system modulates nicotine reward and dependence. J Pharmacol Exp Ther 2008; 326:483-92. [PMID: 18451315 DOI: 10.1124/jpet.108.138321] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A growing body of evidence suggests that the endogenous cannabinoid system modulates the addictive properties of nicotine, the main component of tobacco that produces rewarding effects. In our study, complementary transgenic and pharmacological approaches were used to test the hypothesis that the endocannabinoid system modulates nicotine reward and dependence. An acute injection of nicotine elicited normal analgesic and hypothermic effects in cannabinoid receptor (CB)(1) knockout (KO) mice and mice treated with the CB(1) antagonist rimonabant. However, disruption of CB(1) receptor signaling blocked nicotine reward, as assessed in the conditioned place preference (CPP) paradigm. In contrast, genetic deletion, or pharmacological inhibition of fatty acid amide hydrolase (FAAH), the enzyme responsible for catabolism of the endocannabinoid anandamide, enhanced the expression of nicotine CPP. Although the expression of spontaneous nicotine withdrawal (14 days, 24 mg/kg/day nicotine) was unaffected in CB(1) KO mice, acute administration of rimonabant (3 mg/kg) ameliorated somatic withdrawal signs in wild-type mice. Increasing endogenous levels of anandamide through genetic or pharmacological approaches exacerbated the physical somatic signs of spontaneous nicotine withdrawal in a milder withdrawal model (7 days, 24 mg/kg/day nicotine). Moreover, FAAH-compromised mice displayed increased conditioned place aversion in a mecamylamine-precipitated model of nicotine withdrawal. These findings indicate that endocannabinoids play a role in the rewarding properties of nicotine as well as nicotine dependence liability. Specifically, increasing endogenous cannabinoid levels magnifies, although disrupting CB(1) receptor signaling, attenuates nicotine reward and withdrawal. Taken together, these results support the hypothesis that cannabinoid receptor antagonists may offer therapeutic advantages to treat tobacco dependence.
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Affiliation(s)
- Lisa L Merritt
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA 23298, USA
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Abstract
The purpose of this study was to assess the prevalence of high risk health behaviours among adult Jamaicans aged 15-49 years in 2000, and to compare the results with the 1993 survey. A nationally representative sample of 2013 persons aged 15-74 years was surveyed in 2000 using cluster sampling in the Jamaica Healthy Lifestyle Survey (Wilks et al, unpublished). Interviewer administered questionnaires and anthropometrical measurements were done. Data for a sub-sample of adults aged 15-49 years were analyzed The sub-sample included 1401 persons (473 men and 928 women). Significantly more men (18.6%) than women (4.3%) reported never having had a blood pressure check (p = 0.0001). Approximately one-third of the women reported that they had never had a Pap smear (36.0%) or a breast examination (31.2%). Current cigarette smoking was reported in 28.6% of men and 7.7% of women (OR 3.73 CI 2.71, 5.15), while 49.0% of men and 15.0% of women ever smoked marijuana (OR 3.28 CI 2.56, 4.20). Significantly more men (28.0%) than women (11.7%) reported ever having a sexually transmitted disease (OR 2.93 CI 2.16, 3.97); having more than one sexual partner in the past year (49.1% vs 11.4%, OR 4.31 CI 3.22, 5.76) and usually using a condom during sexual intercourse (55.3% vs 40.5%, OR 1.3 CI 1.11, 1.68). Between 1993 and 2000, significant trends include: more persons reported having a blood pressure check, a reduction in multiple sexual partners, increased condom use at last sex (women), reduced crack/cocaine use (males) and increased marijuana smoking. Although there were some significant positive lifestyle trends between 1993 and 2000, high risk behaviours remain common among Jamaican adults. Comprehensive health promotion programmes are needed to address these risk behaviours.
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Carrasco B, Garcia de la Torre J, Davis KG, Jones S, Athwal D, Walters C, Burton DR, Harding SE. Crystallohydrodynamics for solving the hydration problem for multi-domain proteins: open physiological conformations for human IgG. Biophys Chem 2001; 93:181-96. [PMID: 11804725 DOI: 10.1016/s0301-4622(01)00220-4] [Citation(s) in RCA: 48] [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: 10/18/2022]
Abstract
Hydrodynamic methods provide a route for studying the low-resolution conformation--in terms of time-averaged spatial orientation of the Fab' and Fc domains relative to each other--of the human IgG subclasses, IgG1, IgG2, IgG3 and IgG4 in the environment in which many exist naturally---a solution. Representative modelling strategies are now available using 'shell-bead' or 'shell' modelling of the surface of the molecules with the size-independent programme SOLPRO [J. Garcia de la Torre, S.E. Harding, B. Carrasco, Eur. Biophys. J. 28 (1999) 119-132]. The shell model fits to the equivalent inertial surface ellipsoids of the published crystal structures for the Fab' and Fc domains of IgG are made and an apparent hydration delta(app) of 0.51g/g for Fab' and 0.70 g/g for the glycoprotein Fc are obtained, which yield an average value of (0.59+/-0.07) g/g for the intact antibody (2 Fab'+1 Fc). The relative orientations of these domains for each of the IgG subclasses is then found (using where appropriate a cylindrical hinge) from SOLPRO by modelling the Perrin function, P (i.e. 'frictional ratio due to shape') using this delta(app) and experimentally measured sedimentation coefficients. All the IgG subclasses appear as open, rather than compact structures with the degree of openness IgG3>IgG1>(IgG2, IgG4), with IgG3 and IgG1 non-coplanar. The hingeless mutant IgGMcg, with s degrees (20,w) approximately 6.8 S yields a coplanar structure rather similar to IgG2 and IgG4 and consistent with its crystallographic structure. The extension of this procedure for representing solution conformations of other antibody classes and other multi-domain proteins is indicated.
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Affiliation(s)
- B Carrasco
- Departamento de Quimica Fisica, Facultad de Quimica, Universidad de Murcia, 30071 Murcia, Spain
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Guzman ER, Walters C, Ananth CV, O'Reilly-Green C, Benito CW, Palermo A, Vintzileos AM. A comparison of sonographic cervical parameters in predicting spontaneous preterm birth in high-risk singleton gestations. Ultrasound Obstet Gynecol 2001; 18:204-210. [PMID: 11555447 DOI: 10.1046/j.0960-7692.2001.00526.x] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
OBJECTIVES To assess the role of cervical sonography and to compare various sonographic cervical parameters in their ability to predict spontaneous preterm birth in high-risk singleton gestations. DESIGN A prospective cohort of 469 high-risk gestations were longitudinally evaluated between 15 and 24 weeks' gestation on 1265 occasions with transvaginal cervical sonography and transfundal pressure. The cervical parameters obtained were funnel width and length, cervical length, percent funneling and cervical index. The information obtained was used for patient management. Restriction of physical activities was initiated at cervical lengths of < or = 2.5 cm with cerclage as an option for cervical lengths of < or = 2.0 cm. RESULTS Receiver operating characteristic curve analyses showed that a cervical length of < or = 2.5 cm between 15 and 24 weeks' gestation was equal to the other sonographic cervical parameters in its ability to predict spontaneous preterm birth. The sensitivities for delivery at < 28, < 30, < 32 and < 34 weeks' gestation were 94%, 91%, 83% and 76%, respectively, while the negative predictive values were 99%, 99%, 98% and 96%, respectively. The placement of a cerclage did not influence the positive and negative predictive values. In comparison to women with other risk factors, cervical length was best in the prediction of preterm birth in women with a prior mid-trimester loss; an optimal cut-off of < or = 1.5 cm had sensitivities for delivery at < 28, < 30, < 32 and < 34 weeks' gestation of 100%, 100% 92% and 81%, respectively. The rate of preterm delivery at < 34 weeks' gestation increased dramatically when the cervical length was < or = 1.5 cm. Cervical length was the only independent variable that entered the logistic regression model for the prediction of preterm delivery at < 34 weeks' gestation. CONCLUSIONS In high-risk singleton gestations a cervical length of < or = 2.5 cm was equal to other sonographic cervical parameters in its ability to predict spontaneous preterm birth and was better for the prediction of earlier forms of prematurity (at < 28 and < 30 weeks) than later forms (at < 32 and < 34 weeks). The optimal cervical lengths and their performance for predicting prematurity may be influenced by obstetric risk factors.
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Affiliation(s)
- E R Guzman
- Department of Obstetrics, Gynecology and Reproductive Sciences, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, Saint Peter's University Hospital, New Brunswick, New Jersey, USA.
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Mitas M, Mikhitarian K, Walters C, Baron PL, Elliott BM, Brothers TE, Robison JG, Metcalf JS, Palesch YY, Zhang Z, Gillanders WE, Cole DJ. Quantitative real-time RT-PCR detection of breast cancer micrometastasis using a multigene marker panel. Int J Cancer 2001; 93:162-71. [PMID: 11410861 DOI: 10.1002/ijc.1312] [Citation(s) in RCA: 141] [Impact Index Per Article: 6.1] [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: 11/09/2022]
Abstract
Real-time RT-PCR is a relatively new technology that uses an online fluorescence detection system to determine gene expression levels. It has the potential to significantly improve detection of breast cancer metastasis by virtue of its exquisite sensitivity, high throughput capacity and quantitative readout system. To assess the utility of this technology in breast cancer staging, we determined the relative expression levels of 12 cancer-associated genes (mam, PIP, mamB, CEA, CK19, VEGF, erbB2, muc1, c-myc, p97, vim and Ki67) in 51 negative-control normal lymph nodes and in 17 histopathology-positive ALNs. We then performed a receiver operating characteristic (ROC) curve analysis to determine the sensitivity and specificity levels of each gene. Areas under the ROC curve indicated that the most accurate diagnostic markers were mam (99.6%), PIP (93.3%), CK19 (91.0%), mamB (87.9%), muc1 (81.5%) and CEA (79.4.0%). mam was overexpressed in 16 of 17 lymph nodes known to contain metastatic breast cancer at levels ranging from 22- to 2.8 x 10(5)-fold above normal mean expression, whereas PIP was overexpressed from 30- to 2.2 x 10(6)-fold above normal in 13 lymph nodes. Real-time RT-PCR analysis of pathology-negative LN from breast cancer patients revealed evidence of overexpression of PIP (6 nodes), mam (3 nodes) and CEA (1 node) in 8 of 21 nodes (38%). Our results provide evidence that mam, PIP, CK19, mamB, muc1 and CEA can be applied as a panel for detection of metastatic and occult micrometastatic disease.
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Affiliation(s)
- M Mitas
- Department of Surgery, Medical University of South Carolina, Charleston, SC 29425, USA.
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Wesley-Smith J, Walters C, Pammenter NW, Berjak P. Interactions among water content, rapid (nonequilibrium) cooling to -196 degrees C, and survival of embryonic axes of Aesculus hippocastanum L. seeds. Cryobiology 2001; 42:196-206. [PMID: 11578119 DOI: 10.1006/cryo.2001.2323] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study investigated the interactions among water content, rapid (nonequilibrium) cooling to -196 degrees C using isopentane or subcooled nitrogen, and survival of embryonic axes of Aesculus hippocastanum. Average cooling rates in either cryogen did not exceed 60 degrees C s(-1) for axes containing more than 1.0 g H(2)O g(-1)dw (g g(-1)). Partial dehydration below 0.5 g gg(-1) facilitated faster cooling, averaging about 200 and 580 degrees C s(-1) in subcooled nitrogen and isopentane, respectively. The combination of partial drying and rapid cooling led to increased survival and reduced cellular damage in axes. Electrolyte leakage was 10-fold higher from fully hydrated axes cooled in either cryogen than from control axes that were not cooled. Drying of axes to 0.5 g g(-1), reduced electrolyte leakage of cryopreserved axes to levels similar to those of control material. Axis survival was assayed by germination in vitro. Axes with water contents greater than 1.0 g g(-1), did not survive cryogenic cooling. Between 1.0 and 0.75 g g(-1), axes survived cryogenic exposure but developed abnormally. The proportion of axes developing normally after being cooled in isopentane increased with increasing dehydration below 0.75 g g(-1), reaching a maximum between 0.5 and 0.25 g g(-1) after being cooled at > or =300 degrees C s(-1). Cooling rates attained in subcooled nitrogen did not exceed 250 degrees C s(-1), and normal development of axes was observed only at < or =0.4 g g(-1). These results support the hypothesis that rapid cooling enhances the feasibility of cryopreservation of desiccation-sensitive embryonic axes by increasing the upper limit of allowable water contents and overall survival.
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Affiliation(s)
- J Wesley-Smith
- Electron Microscope Unit, School of Life and Environmental Sciences, University of Natal, Durban, South Africa
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Walters C, Clarke A, Cliff MJ, Lund PA, Harding SE. Trp203 mutation in GroEL promotes a self-association reaction: a hydrodynamic study. Eur Biophys J 2001; 29:420-8. [PMID: 11081403 DOI: 10.1007/s002490000085] [Citation(s) in RCA: 4] [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: 10/27/2022]
Abstract
A combination of sedimentation equilibrium and sedimentation velocity in the analytical ultracentrifuge is used to investigate the hydrodynamic integrity and increased self-association interactions of the mutant GroEL Y203W when compared to the wild-type GroEL molecule, which may be derived from increased hydrophobic exposure caused by the mutation. Sedimentation velocity has revealed that three distinct species were present throughout the concentration ranges used, corresponding to 14-mer (GroEL "super monomer") and 28-mer ("super dimer") subunit compositions with a small amount of 42-mer ("super trimer"), which, from the relative concentration of each species, would give an estimated weight average molecular weight of (1.0 +/- 0.1) x 10(6) Da. Sedimentation equilibrium gave an apparent weight average molecular weight (Mw,app) of (910,000 +/- 5000) Da, which is in agreement with these findings. These results are in contrast to wild-type GroEL which, in excellent agreement with the previous findings of Behlke and co-workers, revealed a single species with an Mw,app of (805,000 +/- 5200) Da and a sedimentation coefficient s(0)20,w of (21.6 +/- 0.3) S. We therefore conclude that the tryptophan mutation at the Y203 location causes a significant degree of self-association of the GroEL 14-mer assembly (with dimer and trimer present). These findings would appear to correlate well with the findings of Gibbons et al., who showed an increase in hydrophobic exposure due to this mutation.
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Affiliation(s)
- C Walters
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, School of Biological Sciences, Sutton Bonington, Leics, UK
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Guzman ER, Walters C, O'reilly-Green C, Kinzler WL, Waldron R, Nigam J, Vintzileos AM. Use of cervical ultrasonography in prediction of spontaneous preterm birth in twin gestations. Am J Obstet Gynecol 2000; 183:1103-7. [PMID: 11084549 DOI: 10.1067/mob.2000.108896] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.6] [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: 11/22/2022]
Abstract
OBJECTIVE This study was undertaken to compare various ultrasonographic cervical parameters with respect to ability to predict spontaneous preterm birth in twin gestations. STUDY DESIGN This prospective study involved 131 women carrying twins who were longitudinally evaluated on 524 occasions between 15 and 28 weeks' gestation with transvaginal cervical ultrasonography and transfundal pressure. The following cervical parameters were obtained: funnel width and length, cervical length, percentage of funneling, and cervical index. Receiver operating characteristic curve analysis was used to determine the ultrasonographic cervical parameter evaluated at 15 to 20 weeks' gestation, 21 to 24 weeks' gestation, and 25 to 28 weeks' gestation that were best for prediction of spontaneous preterm birth at <28 weeks' gestation, <30 weeks' gestation, <32 weeks' gestation, and <34 weeks' gestation. RESULTS The median gestational age at delivery was 36 weeks' gestation (range, 21-41 weeks' gestation). Receiver operating characteristic curve analysis indicted that a cervical length of < or =2.0 cm, regardless of gestational age category at cervical measurement, was at least as good as other ultrasonographic cervical parameters at predicting spontaneous preterm birth. Between 15 and 20 weeks' gestation a cervical length cutoff value of < or =2.0 cm had specificities of 97%, 98%, 99%, and 100% and negative predictive values of 99%, 98%, 95%, and 89% for delivery at <28, <30, <32, and <34 weeks' gestation, respectively. The positive predictive values for delivery at <32 and <34 weeks' gestation were 80% and 100%, respectively. Between 21 and 24 weeks' gestation a cervical length of < or =2.0 cm had specificities of 84%, 84%, 85%, and 86% and negative predictive values of 99%, 99%, 94%, and 87% for delivery at <28, <30, <32, and <34 weeks' gestation, respectively. Between 25 and 28 weeks' gestation cervical length had excellent negative predictive values of 99%, 98%, 95%, and 93% for delivery at <28, <30, <32, and <34 weeks' gestation, respectively. CONCLUSIONS In twin gestations a cervical length of < or =2.0 cm measured between 15 and 28 weeks' gestation was at least as good as other ultrasonographic cervical parameters at predicting spontaneous preterm birth. The high specificities indicate that cervical length was better at predicting the absence than the presence of various degrees of spontaneous prematurity.
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Affiliation(s)
- E R Guzman
- Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Sciences, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, Saint Peter's University Hospital, NJ 08903-0591, USA
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Guzman ER, Walters C, O'reilly-Green C, Meirowitz NB, Gipson K, Nigam J, Vintzileos AM. Use of cervical ultrasonography in prediction of spontaneous preterm birth in triplet gestations. Am J Obstet Gynecol 2000; 183:1108-13. [PMID: 11084550 DOI: 10.1067/mob.2000.108875] [Citation(s) in RCA: 51] [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: 11/22/2022]
Abstract
OBJECTIVE The aim of this study was to assess the role of cervical ultrasonography in the prediction of spontaneous preterm birth in triplet gestations and to compare various ultrasonographic cervical parameters with respect to predictive ability. STUDY DESIGN This prospective cohort study included 51 triplet gestations longitudinally evaluated between 15 and 28 weeks' gestation on 274 occasions with transvaginal cervical ultrasonography and transfundal pressure. The cervical parameters obtained were funnel width and length, cervical length, percentage of funneling, and cervical index. RESULTS Receiver operating characteristic curve analyses showed that cervical lengths of < or =2.5 cm and < or =2.0 cm between 15 and 24 weeks' gestation and between 25 and 28 weeks' gestation, respectively, were at least as good as other ultrasonographic cervical parameters for the prediction of spontaneous preterm birth. A cervical length of < or =2.5 cm between 15 and 20 weeks' gestation had both a specificity and a positive predictive value of 100% for delivery at <28 weeks' gestation, and the sensitivities and negative predictive values ranged from 25% to 50% and from 72% to 91%, respectively, for deliveries at <28, <30, and <32 weeks' gestation. A cervical length of < or =2.5 cm between 21 and 24 weeks' gestation had an 86% sensitivity for prediction of spontaneous delivery at <28 weeks' gestation. A cervical length of < or =2.0 cm between 25 and 28 weeks' gestation had both a sensitivity and a negative predictive value of 100% for delivery at both <28 and <30 weeks' gestation. CONCLUSIONS In triplet gestations cervical lengths of < or =2.5 cm between 15 and 24 weeks' gestation and < or =2.0 cm between 25 and 28 weeks' gestation were at least as good as other ultrasonographic cervical parameters for the prediction of spontaneous preterm birth.
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Affiliation(s)
- E R Guzman
- Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Sciences, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, Saint Peter's University Hospital, New Brunswick 08903, USA
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Holland KT, Aldana O, Bojar RA, Cunliffe WJ, Eady EA, Holland DB, Ingham E, McGeown C, Till A, Walters C. Propionibacterium acnes and acne. Dermatology 2000; 196:67-8. [PMID: 9557229 DOI: 10.1159/000017870] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- K T Holland
- Skin Research Centre, University of Leeds, UK.
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Touchell D, Walters C. Recovery of embryos of Zizania palustris following exposure to liquid nitrogen. Cryo Letters 2000; 21:261-270. [PMID: 12148031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
Factors affecting survival of embryos of Zizania palustris after exposure to liquid nitrogen were investigated. Moisture content was the most critical factor. Embryos desiccated to a moisture content between 0.36 and 0.56 g water per g dry weight had highest survival after liquid nitrogen exposure (56 +/- 4% and 52 +/- 9% respectively). The recovery of embryos in the light following liquid nitrogen exposure also influenced survival. Survival increased from 35 +/- 4% to 56 +/- 4% when embryos containing 0.36 g water per g dry weight were recovered in the dark compared to light. Embryos exposed to desiccation and freezing stresses were subject to increased levels of lipid peroxidation. Light exacerbated lipid peroxidation in recovering embryos. Furthermore, catalase and peroxidase, enzymes involved in reducing reactive oxygen species, increased in activity in response to stress, and were further up-regulated in tissues recovered in the light. This study suggests that there are a number of factors influencing the survival of tissues exposed to liquid nitrogen and recovery procedures that reduce oxidative stress should be employed.
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Affiliation(s)
- D Touchell
- USDA-ARS National Seed Storage Laboratory, 1111 South Mason St, Fort Collins Colorado, 80521, USA
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Carrasco B, de la Torre JG, Byron O, King D, Walters C, Jones S, Harding SE. Novel size-independent modeling of the dilute solution conformation of the immunoglobulin IgG Fab' domain using SOLPRO and ELLIPS. Biophys J 1999; 77:2902-10. [PMID: 10585914 PMCID: PMC1300563 DOI: 10.1016/s0006-3495(99)77123-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
The proliferation of hydrodynamic modeling strategies to represent the shape of quasirigid macromolecules in solution has been hampered by ambiguities caused by size. Universal shape parameters, independent of size, developed originally for ellipsoid modeling, are now available for modeling using the bead-shell approximation via the algorithm SOLPRO. This paper validates such a "size-independent" bead-shell approach by comparison with the exact hydrodynamics of 1) an ellipsoid of revolution and 2) a general triaxial ellipsoid (semiaxial ratios a/b, b/c) based on a fit using the routine ELLIPSE (. J. Mol. Graph. 1:30-38) to the chimeric (human/mouse) IgG Fab' B72.3; a similar fit is obtained for other Fabs. Size-independent application of the bead-shell approximation yields errors of only approximately 1% in frictional ratio based shape functions and approximately 3% in the radius of gyration. With the viscosity increment, errors have been reduced to approximately 3%, representing a significant improvement on earlier procedures. Combination of the Perrin frictional ratio function with the experimentally measured sedimentation coefficient for the same Fab' from B72.3 yields an estimate for the molecular hydration of the Fab' fragment of approximately (0.43 +/- 0.07) g/g. This value is compared to values obtained in a similar way for deoxyhemoglobin (0.44) and ribonuclease (0.27). The application of SOLPRO to the shape analysis of more complex macromolecules is indicated, and we encourage such size-independent strategies. The utility of modern sedimentation data analysis software such as SVEDBERG, DCDT, LAMM, and MSTAR is also clearly demonstrated.
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Affiliation(s)
- B Carrasco
- Departamento de Quimica Fisica, Facultad de Quimica, Universidad de Murcia, 30071 Murcia, Spain
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Kalister H, Newman RD, Read L, Walters C, Hrachovec J, Graham EA. Pharmacy-based evaluation and treatment of minor illnesses in a culturally diverse pediatric clinic. Arch Pediatr Adolesc Med 1999; 153:731-5. [PMID: 10401807 DOI: 10.1001/archpedi.153.7.731] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
BACKGROUND Among medically underserved immigrant parents, access to nonprescription medicines for home treatment of minor childhood illnesses may be limited by scarce financial resources or language barriers. OBJECTIVES To design and implement a new clinical service for an urban ambulatory pediatric clinic with a large immigrant population that allows pharmacists to evaluate and to treat children and adolescents aged 6 months to 19 years with minor acute illnesses and to provide bilingual patient education materials. METHODS We developed protocols and encounter forms for pharmacist evaluation of 5 pediatric conditions: cough/cold, fever, diaper rash, vomiting/diarrhea, and head lice. We published bilingual patient education materials for these conditions in 8 commonly spoken languages. We assessed safety by thoroughly reviewing the medical records of all patients who returned within 1 week of a pharmacy encounter and by asking parents in a telephone survey to compare services received through the pharmacy and the acute care clinic for treatment of the common cold. RESULTS During the first year of this pilot program, 191 patients were evaluated and treated, 145 (76%) for cough/cold. Seventy percent of the patients were immigrants. No unexpected or adverse outcomes were detected, although occasional deviations from established protocols were noted. Parent satisfaction with the pharmacy service was high, and similar to that received through the standard acute care clinic. Patients evaluated by pharmacists were more likely to be attended to promptly (< 15-minute wait) and were more likely to receive written information than patients evaluated by physicians for similar conditions. CONCLUSIONS Pharmacist evaluation and treatment of minor pediatric illnesses seems to be both safe and well accepted. Further studies are needed to evaluate the cost-effectiveness of this service in diverse settings. In states that allow pharmacists to have prescriptive authority, pharmacy-based evaluation and treatment may improve access to care for children with minor illnesses.
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Affiliation(s)
- H Kalister
- School of Pharmacy, University of Washington, and the Harborview Medical Center, Seattle 98118, USA
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Nguyen D, Chan P, Walters C. P-16 Effect of acute and additive heat exposure on sperm hyper-activation, motility, and fertilizing capacity. Fertil Steril 1999. [DOI: 10.1016/s0015-0282(99)00052-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Guzman ER, Forster JK, Vintzileos AM, Ananth CV, Walters C, Gipson K. Pregnancy outcomes in women treated with elective versus ultrasound-indicated cervical cerclage. Ultrasound Obstet Gynecol 1998; 12:323-327. [PMID: 9819870 DOI: 10.1046/j.1469-0705.1998.12050323.x] [Citation(s) in RCA: 44] [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] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
OBJECTIVE To compare pregnancy outcomes in women at risk for pregnancy loss treated with elective versus ultrasound-indicated placement of cerclage. METHODS A retrospective cohort study was performed on two groups of patients with singleton gestations. The first group consisted of women at risk for pregnancy loss who were treated with an elective cerclage, while the second group was managed conservatively and followed with serial transvaginal cervical sonography and transfundal pressure. An emergency cerclage was placed in women in the second group when the endocervical canal length shortened to < 20 mm, either spontaneously or in response to transfundal pressure. The two groups were compared with respect to maternal demographics, obstetric and gynecological history, and gestational age, both at time of cerclage placement and delivery. RESULTS A total of 138 patients were identified. Eighty-one patients were treated with an elective cerclage and 57 with an ultrasound-indicated cerclage. Patients treated with elective cerclages were older (32 versus 27 years, p = 0.0003), more commonly white (56.8% versus 38.6%, p = 0.0380), less commonly nulliparous (23.5% versus 43.9%, p = 0.0063), and more often private patients (92.6% versus 28.1%, p < 0.0001). A history of previous treatment with cerclage (45.7% versus 10.5%, odds ratio (OR) 0.2, 95% confidence interval (CI) 0.1-0.4) and one prior midtrimester loss (53.1% versus 33.3%, OR 0.4, 95% CI 0.2-0.9) were also more common in the elective versus ultrasound-indicated cerclage group. However, there was no difference in the rates of previous preterm delivery, two midtrimester losses, two terminations of pregnancy, in utero diethylstilbestrol exposure, uterine anomalies, history of cone biopsy or parity. As expected, gestational age at placement of cerclage was significantly earlier in the elective group (13.0 versus 20.0 weeks, p < 0.0001). The median (range) gestational age at delivery (37 (15-41) versus 37 (17-41) weeks, p = 0.90), the number of early (< 25 weeks) losses (9.9% versus 8.8%, OR 1.6, 95% CI 0.3-7.9), and preterm deliveries (< 37 weeks) (35.8% versus 36.8%, OR 1.1, 95% CI 0.4-3.2) were similar in the elective and ultrasound-indicated cerclage patients, respectively. CONCLUSION In patients at risk for pregnancy loss, placement of cervical cerclages in response to ultrasonographically detected shortening of the endocervical canal length is a medically acceptable alternative to the use of elective cerclage.
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Affiliation(s)
- E R Guzman
- Department of Obstetrics, Gynecology and Reproductive Sciences, St. Peter's Medical Center, New Brunswick, New Jersey 08903-0591, USA
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Guzman ER, Mellon R, Vintzileos AM, Ananth CV, Walters C, Gipson K. Relationship between endocervical canal length between 15-24 weeks gestation and obstetric history. J Matern Fetal Med 1998; 7:269-72. [PMID: 9848691 DOI: 10.1002/(sici)1520-6661(199811/12)7:6<269::aid-mfm3>3.0.co;2-4] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The object was to determine whether there is a correlation between the obstetric history and the ultrasonographically determined endocervical canal length between 15 and 24 weeks gestation. A retrospective cohort study was performed in singleton pregnancies of multigravidas with normal and abnormal obstetric histories. They underwent sonographic evaluation for the determination of the endocervical canal length between 15 and 24 weeks gestation. The shortest endocervical canal length measurements between 15 and 20 weeks and also between 21 and 24 weeks of gestation were recorded. An ultrasound diagnosis of cervical incompetence was defined as progressive shortening of the endocervical canal length to <2 cm or a single endocervical canal length measurement <2 cm. A multivariable general linear regression model was used to correlate the relationship between endocervical canal lengths at 15-20 weeks and 21-24 weeks gestation in the current pregnancy with the earliest gestational age at delivery of prior pregnancies. Chi-square test was used to determine the relationship between the development of an ultrasound diagnosis of cervical incompetence and the earliest gestational age at delivery of prior pregnancies. A total of 155 pregnancies were studied. The number of women according to the obstetric history categories were: 57 had delivered <24 weeks, 12 between 24 and 26 weeks, 16 between 27 and 32 weeks, 16 between 33 and 36 weeks, and 54 delivered > or =37 weeks. There was a significant correlation between the endocervical canal length measurements between 15-20 (P < 0.0001) weeks and 21-24 weeks (P < 0.0001) in the studied pregnancy and the earliest gestational age at delivery of prior pregnancies. A significant relationship between the ultrasound diagnosis of cervical incompetence and the obstetric history category (P = 0.0026) was observed. There were 36 cases of ultrasound diagnosed cervical incompetence with 91.7% (33/36) occurring in women who had a prior <27 weeks' gestation delivery. These data provide further evidence that cervical incompetence is a relative condition and not an "all or none" phenomenon. In addition, women with a prior delivery <30 weeks gestation should be followed with second trimester serial cervical sonography to rule out cervical incompetence.
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Affiliation(s)
- E R Guzman
- Department of Obstetrics, Gynecology and Reproductive Sciences, UMDNJ-Robert Wood Johnson Medical School, New Brunswick, New Jersey, USA.
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Guzman ER, Mellon C, Vintzileos AM, Ananth CV, Walters C, Gipson K. Longitudinal assessment of endocervical canal length between 15 and 24 weeks' gestation in women at risk for pregnancy loss or preterm birth. Obstet Gynecol 1998; 92:31-7. [PMID: 9649088 DOI: 10.1016/s0029-7844(98)00120-3] [Citation(s) in RCA: 93] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
OBJECTIVE To determine the weekly cervical shortening rates of the endocervical canal between 15 and 24 weeks' gestation in women at risk for pregnancy loss or spontaneous preterm birth. METHODS We performed a retrospective cohort study of transvaginal sonographic measurements of the endocervical canal length done at least twice between 15 and 24 weeks' gestation in women at risk for pregnancy loss and spontaneous preterm birth. The ultrasound diagnosis of cervical incompetence was defined as progressive shortening of the endocervical canal length to 2 cm or less either spontaneously or after application of transfundal pressure. Multivariable linear regression models were developed to determine the weekly crude rate of endocervical canal length shortening rates in cases of competent cervices and incompetent cervices, with incompetent cervices further stratified as those diagnosed at 15-19 weeks' and 20-24 weeks' gestation. Comparisons of the models for weekly rate of endocervical canal length shortening were performed. RESULTS The endocervical canal lengths were measured in 61 women (180 measurements) who did not develop ultrasound evidence of cervical incompetence and 28 women (103 measurements) who had ultrasound evidence of cervical incompetence. Between 15 and 24 weeks' gestation, competent cervices had a nonsignificant rate of endocervical canal length shortening (-0.03 cm/week). During this period in gestation, incompetent cervices had significantly greater endocervical canal length shortening (-0.41 cm/week, P < .001). The rate of endocervical canal length shortening of incompetent cervices diagnosed between 15 and 19 weeks' gestation was -0.52 cm/week (P < .001). The rate of endocervical canal length shortening in incompetent cervices diagnosed between 20 and 24 weeks' gestation was significant and varied from -0.49 cm/week to -0.80 cm/week at 20 and 24 weeks' gestation, respectively (P < .001). The models describing the rate of cervical shortening in the two groups of incompetent cervices were significantly different (P < .001). The sonographic detection of endocervical canal length shortening in the 28 cases of cervical incompetence was identified at a median (range) gestational age of 20 (16-24) weeks. CONCLUSION Weekly rates of endocervical canal length shortening were established, which may be useful for detecting and managing cervical incompetence in high-risk women examined with cervical sonography.
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Affiliation(s)
- E R Guzman
- Department of Obstetrics, Gynecology and Reproductive Sciences, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, St. Peter's Medical Center, New Brunswick 08903-0591, USA.
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Banks RE, Forbes MA, Kinsey SE, Stanley A, Ingham E, Walters C, Selby PJ. Release of the angiogenic cytokine vascular endothelial growth factor (VEGF) from platelets: significance for VEGF measurements and cancer biology. Br J Cancer 1998; 77:956-64. [PMID: 9528841 PMCID: PMC2150108 DOI: 10.1038/bjc.1998.158] [Citation(s) in RCA: 421] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Vascular endothelial growth factor (VEGF) is a potent angiogenic factor with a key role in several pathological processes, including tumour vascularization. Our preliminary observations indicated higher VEGF concentrations in serum samples than in matched plasma samples. We have now demonstrated that this difference is due to the presence of VEGF within platelets and its release upon their activation during coagulation. In eight healthy volunteers, serum VEGF concentrations ranged from 76 to 854 pg ml(-1) and were significantly higher (P < 0.01) than the matched citrated plasma VEGF concentrations, which ranged from < 9 to 42 pg ml(-1). Using platelet-rich plasma, mean (s.d.) platelet VEGF contents of 0.56 (0.36) pg of VEGF 10(-6) platelets were found. Immunocytochemistry demonstrated the cytoplasmic presence of VEGF within megakaryocytes and other cell types within the bone marrow. From examination of the effects of blood sample processing on circulating VEGF concentrations, it is apparent that for accurate measurements, citrated plasma processed within 1 h of venepuncture should be used. Serum is completely unsuitable. The presence of VEGF within platelets has implications for processes involving platelet and endothelial cell interactions. e.g. wound healing, and in tumour metastasis, when platelets adhering to circulating tumour cells may release VEGF at points of adhesion to endothelium, leading to hyperpermeability and extravasation of cells.
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Affiliation(s)
- R E Banks
- ICRF Cancer Medicine Research Unit, St James's University Hospital, Leeds UK
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Buckley MG, Walters C, Wong WM, Cawley MI, Ren S, Schwartz LB, Walls AF. Mast cell activation in arthritis: detection of alpha- and beta-tryptase, histamine and eosinophil cationic protein in synovial fluid. Clin Sci (Lond) 1997; 93:363-70. [PMID: 9404229 DOI: 10.1042/cs0930363] [Citation(s) in RCA: 79] [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] [Indexed: 02/05/2023]
Abstract
1. Although mast cell hyperplasia is a feature of rheumatoid arthritis and osteoarthritis, the extent and nature of mast cell activation in joint disease have not been clearly established. 2. We have investigated the levels of mast cell tryptase and histamine and also of eosinophil cationic protein in synovial fluid collected from 31 patients with rheumatoid arthritis, 14 with seronegative spondyloarthritis and nine with osteoarthritis. Two RIAs for tryptase were employed: one with monoclonal antibody AA5, which was found to bind equally well to both alpha and beta isoforms on Western blots of the recombinant enzyme, and the other with antibody G5, which recognizes predominantly beta-tryptase. 3. alpha-Tryptase, which is likely to be released constitutively from mast cells, appeared to be the major form in synovial fluid, as the assay with antibody AA5 detected appreciably more tryptase than that with antibody G5. beta-Tryptase, which is released on anaphylactic activation of mast cells, was detected in 14 out of 45 synovial fluid samples studied, with concentrations of up to 12 micrograms/l measured by the G5 assay. The apparent levels of beta-tryptase, but not of alpha-tryptase, were closely correlated with those of histamine in the synovial fluid. Patients with osteoarthritis appeared to have a greater proportion of beta-tryptase in the synovial fluid than those with rheumatoid arthritis, as well as higher concentrations of histamine. Eosinophil cationic protein was present at high levels in the synovial fluid, although eosinophil numbers were low, and its concentrations were not correlated with the concentrations of the mast cell products. 4. These data suggest that anaphylactic degranulation of mast cells may have occurred to a greater extent in osteoarthritis than in rheumatoid arthritis, despite the relative lack of synovial inflammation in osteoarthritis. Although the eosinophil cationic protein detected may not reflect eosinophilic inflammation in the joint, the presence in synovial fluid of tryptase of both major forms, and of histamine, appears to indicate that mast cell products are secreted constitutively, as well as by processes of anaphylactic degranulation in rheumatoid arthritis, seronegative spondyloarthritis and osteoarthritis.
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Affiliation(s)
- M G Buckley
- Immunopharmacology Group, Southampton General Hospital, Southampton University Hospitals Trust, U.K
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Abstract
AIMS To compare the application of a non-radioactive in situ hybridisation (ISH) technique with an immunocytochemical technique for the detection of human parvovirus B19 in formalin fixed, paraffin wax embedded sections of macerated fetal tissue. METHODS Archived samples of liver, lung or kidney from 19 human fetuses were investigated for parvovirus B19 using a full length digoxigenin labelled DNA probe of 5.5 kb; bound probe was detected using an anti-digoxigenin (alkaline phosphatase) conjugate and visualised using NBT/BCIP. Immunocytochemical detection of parvovirus B19 was performed using a monoclonal mouse antiparvovirus B19 antiserum, with a streptavidin-biotin complex (horse radish peroxidase) method. Cases were selected to provide a range of diagnostic certainty and a range of degrees of macerative degeneration. RESULTS Parvovirus B19 was found in 15 of 19 cases using the B19 ISH technique compared with 8 of 19 cases using the immunocytochemical technique. The four negative cases were all controls known to be parvovirus B19 free. All ISH positive cases showed excellent staining with low background regardless of extent of maceration and tissue type. In comparison, sections stained by the immunocytochemical method showed considerable non-specific immunoreactivity in many cases, particularly with severe maceration. Kidney and lung tissues gave the cleanest results. CONCLUSIONS ISH is more effective than the immunocytochemical technique for the detection of human parvovirus B19 in macerated fetal tissue. The lack of detectable background staining with the ISH technique led to easier interpretation suggesting that this technique should be the method of choice for the investigation of parvovirus B19 in macerated postmortem tissues.
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Affiliation(s)
- C Walters
- Department of Clinical Laboratory Sciences, Nottingham University Medical School, UK
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