1
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Morris L, Shelton C. Widening the gap: could residential 'simulated altitude prehabilitation' exacerbate health inequalities? Anaesthesia 2024; 79:549-550. [PMID: 38330402 DOI: 10.1111/anae.16252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/26/2024] [Indexed: 02/10/2024]
Affiliation(s)
- L Morris
- North West School of Anaesthesia, Manchester, UK
| | - C Shelton
- Wythenshawe Hospital, Manchester, UK
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2
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Thomas JR, Shelton C, Murphy J, Brittain S, Bray MA, Aspesi P, Concannon J, King FJ, Ihry RJ, Ho DJ, Henault M, Hadjikyriacou A, Neri M, Sigoillot FD, Pham HT, Shum M, Barys L, Jones MD, Martin EJ, Blechschmidt A, Rieffel S, Troxler TJ, Mapa FA, Jenkins JL, Jain RK, Kutchukian PS, Schirle M, Renner S. Enhancing the Small-Scale Screenable Biological Space beyond Known Chemogenomics Libraries with Gray Chemical Matter─Compounds with Novel Mechanisms from High-Throughput Screening Profiles. ACS Chem Biol 2024; 19:938-952. [PMID: 38565185 PMCID: PMC11040606 DOI: 10.1021/acschembio.3c00737] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 02/28/2024] [Accepted: 03/01/2024] [Indexed: 04/04/2024]
Abstract
Phenotypic assays have become an established approach to drug discovery. Greater disease relevance is often achieved through cellular models with increased complexity and more detailed readouts, such as gene expression or advanced imaging. However, the intricate nature and cost of these assays impose limitations on their screening capacity, often restricting screens to well-characterized small compound sets such as chemogenomics libraries. Here, we outline a cheminformatics approach to identify a small set of compounds with likely novel mechanisms of action (MoAs), expanding the MoA search space for throughput limited phenotypic assays. Our approach is based on mining existing large-scale, phenotypic high-throughput screening (HTS) data. It enables the identification of chemotypes that exhibit selectivity across multiple cell-based assays, which are characterized by persistent and broad structure activity relationships (SAR). We validate the effectiveness of our approach in broad cellular profiling assays (Cell Painting, DRUG-seq, and Promotor Signature Profiling) and chemical proteomics experiments. These experiments revealed that the compounds behave similarly to known chemogenetic libraries, but with a notable bias toward novel protein targets. To foster collaboration and advance research in this area, we have curated a public set of such compounds based on the PubChem BioAssay dataset and made it available for use by the scientific community.
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Affiliation(s)
- Jason R. Thomas
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Claude Shelton
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Jason Murphy
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Scott Brittain
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Mark-Anthony Bray
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Peter Aspesi
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - John Concannon
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Frederick J. King
- Novartis
Biomedical Research, San Diego, California 92121, United States
| | - Robert J. Ihry
- Novartis
Biomedical Research, San Diego, California 92121, United States
| | - Daniel J. Ho
- Novartis
Biomedical Research, San Diego, California 92121, United States
| | - Martin Henault
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | | | - Marilisa Neri
- Novartis
Biomedical Research, Basel 4056, Switzerland
| | | | - Helen T. Pham
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Matthew Shum
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Louise Barys
- Novartis
Biomedical Research, Basel 4056, Switzerland
| | - Michael D. Jones
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Eric J. Martin
- Novartis
Biomedical Research, Emeryville, California 94608, United States
| | | | | | | | - Felipa A. Mapa
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Jeremy L. Jenkins
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | - Rishi K. Jain
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
| | | | - Markus Schirle
- Novartis
Biomedical Research, Cambridge, Massachusetts 02139, United States
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3
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Shelton C, Lentzos S. Sustainability is a core outcome: filling research gaps in sustainable peri-operative care. Anaesthesia 2024; 79:226-231. [PMID: 38205566 DOI: 10.1111/anae.16218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/11/2023] [Indexed: 01/12/2024]
Affiliation(s)
- C Shelton
- Department of Anaesthesia, Wythenshawe Hospital, Manchester, UK
- Lancaster Medical School, Lancaster University, Lancaster, UK
| | - S Lentzos
- National Institute for Health and Care Research Co-ordinating Centre, Southampton, UK
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4
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Chakera A, Harrison S, Mitchell J, Oliver C, Ralph M, Shelton C. The Nitrous Oxide Project: assessment of advocacy and national directives to deliver mitigation of anaesthetic nitrous oxide. Anaesthesia 2024; 79:270-277. [PMID: 38205565 DOI: 10.1111/anae.16211] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/23/2023] [Indexed: 01/12/2024]
Abstract
The environmental emissions attributed to anaesthetic nitrous oxide across the NHS are comparable to the carbon dioxide released by 135,000 flights from Frankfurt to New York. Much of these emissions are attributable to cumbersome and inadequately managed piped systems, resulting in excessive loss and waste. Since 2020, multiple hospital sites have been engaging with the Nitrous Oxide Project, a quality improvement method supporting a 'lean systems' approach to the provision of nitrous oxide. This review considers the frameworks supporting medical gas management in UK healthcare systems, and the impact of professional advocacy and medical gas stewardship to drive anaesthetic nitrous oxide mitigation in the NHS. Nitrous oxide mitigation efforts by grassroots and professional advocacy networks are enhanced through national centralised emission monitoring, distribution of data, technical information and provision of quality analysis. Given the climate harms of nitrous oxide, concerted efforts should be made to rationalise its use, and resources should be committed to supporting this at local, regional and national levels.
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Affiliation(s)
- A Chakera
- Health Infrastructure and Sustainability, Scottish Government, Edinburgh, UK
- The Nitrous Oxide Project, Edinburgh, UK
| | - S Harrison
- Northwest School of Anaesthesia, Manchester, UK
| | - J Mitchell
- Department of Anaesthesia, University Hospital Ayr, Ayr, UK
| | - C Oliver
- Department of Anaesthesia, University Hospital of Wales, Cardiff, UK
| | - M Ralph
- Engineering and Assurance, NHS Scotland Assure, Glasgow, UK
| | - C Shelton
- Department of Anaesthesia, Wythenshawe Hospital, Manchester, UK
- Lancaster Medical School, Lancaster University, Lancaster, UK
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5
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Edwards D, Best N, Crawford J, Zi L, Shelton C, Fowler A. Using Bayesian Dynamic Borrowing to Maximize the Use of Existing Data: A Case-Study. Ther Innov Regul Sci 2024; 58:1-10. [PMID: 37910271 PMCID: PMC10764450 DOI: 10.1007/s43441-023-00585-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 09/25/2023] [Indexed: 11/03/2023]
Abstract
Bayesian Dynamic Borrowing (BDB) designs are being increasingly used in clinical drug development. These methods offer a mathematically rigorous and robust approach to increase efficiency and strengthen evidence by integrating existing trial data into a new clinical trial. The regulatory acceptability of BDB is evolving and varies between and within regulatory agencies. This paper describes how BDB can be used to design a new randomised clinical trial including external data to supplement the planned sample size and discusses key considerations related to data re-use and BDB in drug development programs. A case-study illustrating the planning and evaluation of a BDB approach to support registration of a new medicine with the Center for Drug Evaluation in China will be presented. Key steps and considerations for the use of BDB will be discussed and evaluated, including how to decide whether it is appropriate to borrow external data, which external data can be re-used, the weight to put on the external data and how to decide if the new study has successfully demonstrated treatment benefit.
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Affiliation(s)
- Dawn Edwards
- GSK, 980 Great West Road, Brentford, TW8 9GS, Middlesex, UK.
| | - N Best
- GSK, 980 Great West Road, Brentford, TW8 9GS, Middlesex, UK
| | - J Crawford
- GSK, 980 Great West Road, Brentford, TW8 9GS, Middlesex, UK
| | | | | | - A Fowler
- GSK, 980 Great West Road, Brentford, TW8 9GS, Middlesex, UK
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6
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Shiralkar S, Field E, Murphy E, Shelton C. The role of volatile capture technology in desflurane disposal from decommissioned vaporisers. Anaesthesia 2023; 78:1298-1300. [PMID: 37423619 DOI: 10.1111/anae.16044] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/25/2023] [Indexed: 07/11/2023]
Affiliation(s)
- S Shiralkar
- North West School of Anaesthesia, Manchester, UK
| | - E Field
- Cardiff University, Cardiff, UK
| | - E Murphy
- Manchester University NHS Foundation Trust, Manchester, UK
| | - C Shelton
- Lancaster Medical School, Lancaster, UK
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7
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Nichols W, Nicholls J, Bill V, Shelton C. Temperature changes of CoolSticks during simulated use. Int J Obstet Anesth 2023; 55:103890. [PMID: 37169662 DOI: 10.1016/j.ijoa.2023.103890] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 03/13/2023] [Accepted: 04/12/2023] [Indexed: 05/13/2023]
Abstract
INTRODUCTION Cold sensation is often used to check neuraxial anaesthesia and analgesia. One opportunity to reduce the carbon footprint of anaesthesia is to replace vapo-coolant sprays such as ethyl chloride with a reusable device called the CoolStick, which is cooled in a refrigerator between uses. We designed a study to investigate how long the CoolStick remains at its working temperature, which we defined as <15 °C. METHOD Experiments were undertaken using a thermocouple and digital temperature sensor attached to the CoolStick. We conducted two experiments to assess temperature changes following removal from the refrigerator for 10 min; the first investigated passive re-warming in the ambient theatre environment and the second investigated re-warming in simulated use. In our third experiment, we investigated the time taken to cool the device in the refrigerator, following use. Each experiment was repeated three times. RESULTS In the passive re-warming experiment, the mean CoolStick temperature was 7.3 °C at the start, and 14.3 °C after 10 min. In the simulated use experiment, the mean CoolStick temperature was 7.3 °C at the start, and 18.9 °C at 10 min. In the cooling experiment, the mean CoolStick temperature was 15 °C at the start and 7.6 °C at 40 min. CONCLUSION Our study indicates that it is feasible to use the CoolStick for providing cold sensation in clinical practice. Further study would be required to directly compare the effectiveness of the device to existing methods such as coolant sprays or ice in the clinical setting.
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Affiliation(s)
- W Nichols
- North West School of Anaesthesia, Health Education England North West, Manchester, UK
| | - J Nicholls
- North West School of Anaesthesia, Health Education England North West, Manchester, UK
| | - V Bill
- North West School of Anaesthesia, Health Education England North West, Manchester, UK
| | - C Shelton
- Department of Anaesthesia, Wythenshawe Hospital, Manchester, UK; Lancaster Medical School, Lancaster University, Lancaster, UK.
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8
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Collinson S, Shelton C, Eusuf D. Observations on inadequate neuraxial anaesthesia and patient-centred care. Anaesthesia 2023; 78:533. [PMID: 36480420 DOI: 10.1111/anae.15937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/22/2022] [Indexed: 12/13/2022]
Affiliation(s)
- S Collinson
- Manchester University NHS Foundation Trust, Manchester, UK
| | - C Shelton
- Manchester University NHS Foundation Trust, Manchester, UK
| | - D Eusuf
- Manchester University NHS Foundation Trust, Manchester, UK
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9
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Affiliation(s)
- S White
- Department of Anaesthesia, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
| | - L Fang
- North West School of Anaesthesia, Health Education England North West, Manchester, UK
| | - C Shelton
- Department of Anaesthesia, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK.,Lancaster Medical School, Lancaster University, Lancaster, UK
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10
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Harrison S, Davies E, Shelton C. Aerosol-generating procedures: research, guidance and implementation. Anaesthesia 2023; 78:150-154. [PMID: 36196792 DOI: 10.1111/anae.15878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/21/2022] [Indexed: 01/11/2023]
Affiliation(s)
- S Harrison
- North West School of Anaesthesia, Manchester, UK
| | - E Davies
- North West School of Anaesthesia, Manchester, UK
| | - C Shelton
- Department of Anaesthesia, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK.,Lancaster Medical School, Lancaster University, Lancaster, Lancashire, UK
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11
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Affiliation(s)
- L. Fang
- North West School of Anaesthesia, Manchester, UK
| | - R. Hixson
- County Durham and Darlington NHS Foundation Trust, Darlington, UK
| | - C. Shelton
- Manchester University NHS Foundation Trust, Manchester, UK
- Lancaster Medical School, Lancaster University, Lancaster, UK
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12
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Cleland J, Bill V, Williams E, Shelton C. Retained desflurane in decommissioned vaporisers: a national problem? Anaesthesia 2022; 78:651-652. [PMID: 36437774 DOI: 10.1111/anae.15930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/04/2022] [Indexed: 11/30/2022]
Affiliation(s)
- J Cleland
- Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - V Bill
- North West School of Anaesthesia, Health Education England North West, Manchester, UK
| | - E Williams
- Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - C Shelton
- Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
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13
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Pinder A, Fang L, Fieldhouse A, Goddard A, Lovett R, Khan-Perez J, Maclennan K, Mason E, MacCarrick T, Shelton C. Implementing nitrous oxide cracking technology in the labour ward to reduce occupational exposure and environmental emissions: a quality improvement study . Anaesthesia 2022; 77:1228-1236. [PMID: 36108342 DOI: 10.1111/anae.15838] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/13/2022] [Indexed: 12/27/2022]
Abstract
Nitrous oxide, a potent greenhouse gas, is a common labour analgesic. One method which may reduce its carbon footprint is to 'crack' the exhaled gas into nitrogen and oxygen using catalytic destruction. In this quality improvement project, based on environmental monitoring and staff feedback, we assessed the impact of nitrous oxide cracking technology in the maternity setting. Mean ambient nitrous oxide levels were recorded during the final 30 minutes of uncomplicated labour in 36 cases and plotted on a run chart. Interventions were implemented in four stages, comprising: stage 1, baseline (12 cases); stage 2, cracking with nitrous oxide delivered and scavenged via a mouthpiece (eight cases); stage 3, cracking with nitrous oxide via a facemask with an air-filled cushion (eight cases); stage 4, cracking with nitrous oxide via a low-profile facemask, and enhanced coaching on the use of the technology (eight cases). The median ambient nitrous oxide levels were 71% lower than baseline in stage 2 and 81% lower in stage 4. Staff feedback was generally positive, though some found the technology to be cumbersome; successful implementation relies on effective staff engagement. Our results indicate that cracking technology can reduce ambient nitrous oxide levels in the obstetric setting, with potential for reductions in environmental impacts and occupational exposure.
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Affiliation(s)
- A Pinder
- North West School of Anaesthesia, Health Education England North West, Manchester, UK.,North West School of Anaesthesia, Health Education England North West, Manchester, UK
| | - L Fang
- North West School of Anaesthesia, Health Education England North West, Manchester, UK.,North West School of Anaesthesia, Health Education England North West, Manchester, UK
| | - A Fieldhouse
- Manchester Birth Centre, St Mary's at Wythenshawe Hospital, Manchester, UK
| | - A Goddard
- Department of Anaesthesia, St John's Hospital, Livingston, UK
| | - R Lovett
- Department of Anaesthesia, St John's Hospital, Livingston, UK
| | - J Khan-Perez
- North West School of Anaesthesia, Health Education England North West, Manchester, UK
| | - K Maclennan
- Department of Anaesthesia, Manchester Royal Infirmary, Manchester, UK
| | - E Mason
- Manchester Birth Centre, St Mary's at Wythenshawe Hospital, Manchester, UK
| | - T MacCarrick
- North West School of Anaesthesia, Health Education England North West, Manchester, UK
| | - C Shelton
- Department of Anaesthesia, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK.,Lancaster Medical School, Lancaster University, Lancaster, UK
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14
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Bhatia K, Columb M, Shelton C, Lie J, Leach S, Froud O, Verma D, Sturgess P, Sawyerr A, Desai J, Gould N, Kumari S, Sen U, Verma P, Kamath P, Koirala A, Kimber‐Craig S, Eccles J, Bewlay A, Eslam E, Radwan M, Hulgur M, Christian J, Aiyad A. Epidural labour analgesia rates during the
COVID
‐19 pandemic in the north‐west of England. Anaesthesia 2022; 77:1055-1056. [DOI: 10.1111/anae.15780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/08/2022] [Indexed: 11/28/2022]
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15
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Nicholls J, Eusuf D, Shelton C. Over-exposed? Infra-red thermography and the assessment of spinal anaesthesia. Int J Obstet Anesth 2022; 51:103563. [DOI: 10.1016/j.ijoa.2022.103563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Accepted: 05/11/2022] [Indexed: 10/18/2022]
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Affiliation(s)
- D. Eusuf
- Health Education England North West, Manchester, UK
| | - C. Shelton
- Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
- Lancaster Medical School, Lancaster, UK
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17
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Salvi A, Young AN, Huntsman AC, Pergande MR, Korkmaz MA, Rathnayake RA, Mize BK, Kinghorn AD, Zhang X, Ratia K, Schirle M, Thomas JR, Brittain SM, Shelton C, Aldrich LN, Cologna SM, Fuchs JR, Burdette JE. PHY34 inhibits autophagy through V-ATPase V0A2 subunit inhibition and CAS/CSE1L nuclear cargo trafficking in high grade serous ovarian cancer. Cell Death Dis 2022; 13:45. [PMID: 35013112 PMCID: PMC8748433 DOI: 10.1038/s41419-021-04495-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 11/29/2021] [Accepted: 12/17/2021] [Indexed: 12/22/2022]
Abstract
PHY34 is a synthetic small molecule, inspired by a compound naturally occurring in tropical plants of the Phyllanthus genus. PHY34 was developed to have potent in vitro and in vivo anticancer activity against high grade serous ovarian cancer (HGSOC) cells. Mechanistically, PHY34 induced apoptosis in ovarian cancer cells by late-stage autophagy inhibition. Furthermore, PHY34 significantly reduced tumor burden in a xenograft model of ovarian cancer. In order to identify its molecular target/s, we undertook an unbiased approach utilizing mass spectrometry-based chemoproteomics. Protein targets from the nucleocytoplasmic transport pathway were identified from the pulldown assay with the cellular apoptosis susceptibility (CAS) protein, also known as CSE1L, representing a likely candidate protein. A tumor microarray confirmed data from mRNA expression data in public databases that CAS expression was elevated in HGSOC and correlated with worse clinical outcomes. Overexpression of CAS reduced PHY34 induced apoptosis in ovarian cancer cells based on PARP cleavage and Annexin V staining. Compounds with a diphyllin structure similar to PHY34 have been shown to inhibit the ATP6V0A2 subunit of V(vacuolar)-ATPase. Therefore, ATP6V0A2 wild-type and ATP6V0A2 V823 mutant cell lines were tested with PHY34, and it was able to induce cell death in the wild-type at 246 pM while the mutant cells were resistant up to 55.46 nM. Overall, our data demonstrate that PHY34 is a promising small molecule for cancer therapy that targets the ATP6V0A2 subunit to induce autophagy inhibition while interacting with CAS and altering nuclear localization of proteins.
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Affiliation(s)
- Amrita Salvi
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, IL, 60607, USA
| | - Alexandria N Young
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, IL, 60607, USA
| | - Andrew C Huntsman
- Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, OH, 43210, USA
| | - Melissa R Pergande
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL, 60607, USA
| | - Melissa A Korkmaz
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL, 60607, USA
| | | | - Brittney K Mize
- Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, OH, 43210, USA
| | - A Douglas Kinghorn
- Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, OH, 43210, USA
| | - Xiaoli Zhang
- Department of Biomedical Informatics, The Ohio State University, Columbus, OH, 43210, USA
| | - Kiira Ratia
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, IL, 60607, USA
| | - Markus Schirle
- Novartis Institutes for BioMedical Research, 181 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Jason R Thomas
- Novartis Institutes for BioMedical Research, 181 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Scott M Brittain
- Novartis Institutes for BioMedical Research, 181 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Claude Shelton
- Novartis Institutes for BioMedical Research, 181 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Leslie N Aldrich
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL, 60607, USA
| | - Stephanie M Cologna
- Department of Chemistry, University of Illinois at Chicago, Chicago, IL, 60607, USA
| | - James R Fuchs
- Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, OH, 43210, USA
| | - Joanna E Burdette
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, IL, 60607, USA.
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18
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Gaines M, Pinder A, MacCarrick T, Khan-Perez J, Fang L, Shelton C. Bench experiments to investigate the effect of nitrous oxide cracking technology in ideal circumstances. Anaesthesia 2021; 77:225-226. [PMID: 34875718 DOI: 10.1111/anae.15632] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/12/2021] [Indexed: 12/15/2022]
Affiliation(s)
- M Gaines
- North West School of Anaesthesia, Manchester, UK
| | - A Pinder
- North West School of Anaesthesia, Manchester, UK
| | - T MacCarrick
- North West School of Anaesthesia, Manchester, UK
| | - J Khan-Perez
- North West School of Anaesthesia, Manchester, UK
| | - L Fang
- North West School of Anaesthesia, Manchester, UK
| | - C Shelton
- Wythenshawe Hospital, Manchester, UK
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19
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Affiliation(s)
- C. Shelton
- Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
- Lancaster Medical School, Lancaster University, Lancaster, UK
| | - T. Huda
- Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - A. Lee
- Columbia University Irving Medical Center, New York, NY, USA
- Margaret Wood Center for Simulation and Education, New York, NY, USA
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20
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Shelton C, Ailstock L, Jordan B, Peach M. OFP01.06 Improving Rural Disparity in Lung Cancer Outcomes Starting With An Academic-Community Network Model of LDCT Screening. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2020.10.038] [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: 11/26/2022]
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21
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Baraza W, Shelton C. No doctor is an island: the 'social distancing' of guidelines during the COVID-19 pandemic. Br J Surg 2020; 107:e389. [PMID: 33448338 PMCID: PMC7929218 DOI: 10.1002/bjs.11830] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 05/28/2020] [Indexed: 11/19/2022]
Affiliation(s)
- W Baraza
- Consultant General and Colorectal Surgeon, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
| | - C Shelton
- Consultant Anaesthetist, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK.,Senior Clinical Lecturer in Anaesthesia, Lancaster Medical School, Faculty of Health and Medicine, Lancaster University, Lancaster, UK
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22
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Affiliation(s)
- C. Shelton
- Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, UK
- Lancaster Medical School, Lancaster University, Lancaster, UK
| | - S. White
- Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
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Kurimchak AM, Shelton C, Herrera-Montávez C, Duncan KE, Chernoff J, Duncan JS. Intrinsic Resistance to MEK Inhibition through BET Protein-Mediated Kinome Reprogramming in NF1-Deficient Ovarian Cancer. Mol Cancer Res 2019; 17:1721-1734. [PMID: 31043489 DOI: 10.1158/1541-7786.mcr-18-1332] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Revised: 03/14/2019] [Accepted: 04/29/2019] [Indexed: 11/16/2022]
Abstract
Mutation or deletion of Neurofibromin 1 (NF1), an inhibitor of RAS signaling, frequently occurs in epithelial ovarian cancer (EOC), supporting therapies that target downstream RAS effectors, such as the RAF-MEK-ERK pathway. However, no comprehensive studies have been carried out testing the efficacy of MEK inhibition in NF1-deficient EOC. Here, we performed a detailed characterization of MEK inhibition in NF1-deficient EOC cell lines using kinome profiling and RNA sequencing. Our studies showed MEK inhibitors (MEKi) were ineffective at providing durable growth inhibition in NF1-deficient cells due to kinome reprogramming. MEKi-mediated destabilization of FOSL1 resulted in induced expression of receptor tyrosine kinases (RTK) and their downstream RAF and PI3K signaling, thus overcoming MEKi therapy. MEKi synthetic enhancement screens identified BRD2 and BRD4 as integral mediators of the MEKi-induced RTK signatures. Inhibition of bromo and extra terminal (BET) proteins using BET bromodomain inhibitors blocked MEKi-induced RTK reprogramming, indicating that BRD2 and BRD4 represent promising therapeutic targets in combination with MEKi to block resistance due to kinome reprogramming in NF1-deficient EOC. IMPLICATIONS: Our findings suggest MEK inhibitors will likely not be effective as single-agent therapies in NF1-deficient EOC due to kinome reprogramming. Cotargeting BET proteins in combination with MEKis to block reprogramming at the transcriptional level may provide an epigenetic strategy to overcome MEKi resistance in NF1-deficient EOC.
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Affiliation(s)
- Alison M Kurimchak
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Claude Shelton
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | | | - Kelly E Duncan
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - Jonathan Chernoff
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania
| | - James S Duncan
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania.
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24
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Shelton C, Goodwin D, Mort M, Nichols W, Smith A. Hip fracture anaesthesia: the importance of inputs. Br J Anaesth 2018; 120:1132-1133. [DOI: 10.1016/j.bja.2018.02.002] [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] [Received: 02/01/2018] [Accepted: 02/05/2018] [Indexed: 10/17/2022] Open
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25
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White SM, Altermatt F, Barry J, Ben-David B, Coburn M, Coluzzi F, Degoli M, Dillane D, Foss NB, Gelmanas A, Griffiths R, Karpetas G, Kim JH, Kluger M, Lau PW, Matot I, McBrien M, McManus S, Montoya-Pelaez LF, Moppett IK, Parker M, Porrill O, Sanders RD, Shelton C, Sieber F, Trikha A, Xuebing X. International Fragility Fracture Network Delphi consensus statement on the principles of anaesthesia for patients with hip fracture. Anaesthesia 2018; 73:863-874. [DOI: 10.1111/anae.14225] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/01/2018] [Indexed: 01/16/2023]
Affiliation(s)
- S. M. White
- Brighton and Sussex University Hospitals NHS Trust; Brighton East Sussex UK
| | - F. Altermatt
- División de Anestesiología; Escuela de Medicina; Pontificia Universidad Católica de Chile; Santiago Chile
| | - J. Barry
- Cairns Hospital; Queensland Australia
| | - B. Ben-David
- University of Pittsburgh Medical Centre; Pittsburgh PA USA
| | - M. Coburn
- Medical Faculty; RWTH Aachen University; Aachen Germany
| | - F. Coluzzi
- Department Medical and Surgical Sciences and Biotechnologies; Sapienza University of Rome; Latina Italy
| | - M. Degoli
- Ospedale Civile di Baggiovara; Azienda Ospedaliero Universitaria di Modena; Modena Italy
| | - D. Dillane
- Anesthesiology and Pain Medicine; University of Alberta; Canada
| | - N. B. Foss
- Department of Anaesthesiology and Intensive Care Medicine; Hvidovre University Hospital; Hvidovre Denmark
| | - A. Gelmanas
- Hospital of Lithuanian University of Health Sciences Kauno klinikos; Lithuania
| | - R. Griffiths
- Peterborough and Stamford Hospitals NHS Trust; Peterborough UK
| | - G. Karpetas
- General University Hospital of Patras; Rio Greece
| | - J.-H. Kim
- Korea University College of Medicine; Seoul South Korea
| | | | - P.-W. Lau
- University of Hong Kong; Hong Kong China
| | - I. Matot
- Critical Care and Pain; Tel Aviv Medical Center; Sackeler School of Medicine; Tel Aviv Israel
| | | | | | - L. F. Montoya-Pelaez
- Department of Anaesthesia and Perioperative Medicine; Groote Schuur Hospital; University of Cape Town; Cape Town South Africa
| | - I. K. Moppett
- Anaesthesia and Critical Care Section; Division of Clinical Neuroscience; Queen's Medical Centre Campus; Nottingham University Hospitals NHS Trust; University of Nottingham; Nottingham UK
| | - M. Parker
- Peterborough and Stamford Hospitals NHS Trust; Peterborough UK
| | - O. Porrill
- New Somerset Hospital; University of Cape Town; South Africa
| | | | - C. Shelton
- Lancaster Medical School and Wythenshawe Hospital; Manchester UK
| | - F. Sieber
- Johns Hopkins Bayview Medical Center; Baltimore MD USA
| | - A. Trikha
- All India Institute of Medical Sciences; New Delhi India
| | - X. Xuebing
- University of Hong Kong-Shenzhen Hospital; Shenzhen China
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26
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Crook TS, Beck PA, Gadberry MS, Sims MB, Stewart B, Shelton C, McLean DJ, Chapman JD, Koltes JE. 108 Effects of Omnigen-AF ® on Cow Performance. J Anim Sci 2018. [DOI: 10.1093/jas/sky027.101] [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: 11/14/2022] Open
Affiliation(s)
- T S Crook
- University of Arkansas Division of Agriculture Department of Animal Science, Fayetteville, AR
| | - P A Beck
- University of Arkansas Division of Agriculture SWREC, Hope, AR
| | - M S Gadberry
- Department of Animal Science, University of Arkansas, Little Rock, AR
| | - M B Sims
- University of Arkansas Division of Agriculture SWREC, Hope, AR
| | - B Stewart
- University of Arkansas Division of Agriculture SWREC, Hope, AR
| | - C Shelton
- University of Arkansas Division of Agriculture SWREC, Hope, AR
| | - D J McLean
- Phibro Animal Health Corporation, Teaneck, NJ
| | - J D Chapman
- Phibro Animal Health Corporation, Quincy, IL
| | - J E Koltes
- Department of Animal Science, Iowa State University, Ames, IA
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27
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Crook TS, Koltes JE, Stewart B, Shelton C, Sims MB, McLean DJ, Chapman JD, Beck PA. 084 Effect of Omnigen-AF on the preweaning performance of beef calves. J Anim Sci 2017. [DOI: 10.2527/asasann.2017.084] [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: 11/13/2022] Open
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28
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Kurimchak AM, Shelton C, Duncan KE, Johnson KJ, Brown J, O'Brien S, Gabbasov R, Fink LS, Li Y, Lounsbury N, Abou-Gharbia M, Childers WE, Connolly DC, Chernoff J, Peterson JR, Duncan JS. Abstract NTOC-087: DYNAMIC REPROGRAMMING OF THE KINOME OVERCOMES BET PROTEIN INHIBITION IN OVARIAN CANCER. Clin Cancer Res 2017. [DOI: 10.1158/1557-3265.ovcasymp16-ntoc-087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
High-grade serous ovarian carcinoma (HGS-OvCa) is the most common and deadly form of ovarian cancer, and currently lacks effective targeted therapies. Recently, proteins involved in chromatin remodeling such as the BET bromodomain protein BRD4 have emerged as an exciting new class of targets for the treatment of cancer. Targeted BRD4 inhibition has been shown to cause tumor regression and apoptosis in a number of cancers, including HGS-OvCa. Consequently, small molecule BET bromodomain inhibitors (BETi) are actively being pursued in clinical trials. In our preliminary studies, we discovered that the BET inhibitor JQ1 dramatically reduced MYC protein levels resulting in inhibited cell growth and survival in a panel of HGS-OvCa cell lines. Importantly, although JQ1 initially caused significant growth arrest and apoptosis, the majority of HGS-OvCa cell lines acquired drug resistance. Detailed molecular characterization of JQ1- resistant HGS-OvCa cells showed the return of MYC protein levels accompanied by elevated PI3K-AKT activity, suggesting the acquired resistance stems from activated kinase signaling. Our laboratory has designed a novel mass spectrometry approach that globally measures kinase activity to identify the kinase networks responsible for drug resistance. Using this technology, we analyzed global kinase activity in JQ1-resistant cells and observed the activation of several receptor-tyrosine kinases (RTKs), including EGFR, FGFRs and IGF1R known to strongly drive PI3K-AKT pro-survival signaling pathways. These findings suggest that BETi therapies may have limited success as single agent therapies due to “adaptive kinome reprogramming” and will likely require combination strategies involving inhibitors targeting protein kinases and BET bromodomain proteins.
Citation Format: Alison M. Kurimchak, Claude Shelton, Kelly E. Duncan, Katherine J. Johnson, Jennifer Brown, Shane O'Brien, Rashid Gabbasov, Lauren S. Fink, Yuesheng Li, Nicole Lounsbury, Magid Abou-Gharbia, Wayne E. Childers, Denise C. Connolly, Jonathan Chernoff, Jeffrey R. Peterson, James S. Duncan. DYNAMIC REPROGRAMMING OF THE KINOME OVERCOMES BET PROTEIN INHIBITION IN OVARIAN CANCER [abstract]. In: Proceedings of the 11th Biennial Ovarian Cancer Research Symposium; Sep 12-13, 2016; Seattle, WA. Philadelphia (PA): AACR; Clin Cancer Res 2017;23(11 Suppl):Abstract nr NTOC-087.
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Affiliation(s)
- Alison M. Kurimchak
- 1Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - Claude Shelton
- 1Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - Kelly E. Duncan
- 1Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | | | - Jennifer Brown
- 1Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - Shane O'Brien
- 2Molecular Therapeutics Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - Rashid Gabbasov
- 2Molecular Therapeutics Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - Lauren S. Fink
- 1Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - Yuesheng Li
- 1Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - Nicole Lounsbury
- 3Moulder Center for Drug Discovery Research, Temple University School of Pharmacy, Philadelphia, PA 19140, USA
| | - Magid Abou-Gharbia
- 3Moulder Center for Drug Discovery Research, Temple University School of Pharmacy, Philadelphia, PA 19140, USA
| | - Wayne E. Childers
- 3Moulder Center for Drug Discovery Research, Temple University School of Pharmacy, Philadelphia, PA 19140, USA
| | - Denise C. Connolly
- 2Molecular Therapeutics Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - Jonathan Chernoff
- 1Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - Jeffrey R. Peterson
- 1Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
| | - James S. Duncan
- 1Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, 19111, USA
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29
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Ulam F, Shelton C, Richards L, Davis L, Hunter B, Fregni F, Higgins K. Cumulative effects of transcranial direct current stimulation on EEG oscillations and attention/working memory during subacute neurorehabilitation of traumatic brain injury. Clin Neurophysiol 2015; 126:486-96. [DOI: 10.1016/j.clinph.2014.05.015] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 04/25/2014] [Accepted: 05/22/2014] [Indexed: 11/30/2022]
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30
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Haralalka S, Shelton C, Cartwright HN, Guo F, Trimble R, Kumar RP, Abmayr SM. Live imaging provides new insights on dynamic F-actin filopodia and differential endocytosis during myoblast fusion in Drosophila. PLoS One 2014; 9:e114126. [PMID: 25474591 PMCID: PMC4256407 DOI: 10.1371/journal.pone.0114126] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Accepted: 10/28/2014] [Indexed: 11/29/2022] Open
Abstract
The process of myogenesis includes the recognition, adhesion, and fusion of committed myoblasts into multinucleate syncytia. In the larval body wall muscles of Drosophila, this elaborate process is initiated by Founder Cells and Fusion-Competent Myoblasts (FCMs), and cell adhesion molecules Kin-of-IrreC (Kirre) and Sticks-and-stones (Sns) on their respective surfaces. The FCMs appear to provide the driving force for fusion, via the assembly of protrusions associated with branched F-actin and the WASp, SCAR and Arp2/3 pathways. In the present study, we utilize the dorsal pharyngeal musculature that forms in the Drosophila embryo as a model to explore myoblast fusion and visualize the fusion process in live embryos. These muscles rely on the same cell types and genes as the body wall muscles, but are amenable to live imaging since they do not undergo extensive morphogenetic movement during formation. Time-lapse imaging with F-actin and membrane markers revealed dynamic FCM-associated actin-enriched protrusions that rapidly extend and retract into the myotube from different sites within the actin focus. Ultrastructural analysis of this actin-enriched area showed that they have two morphologically distinct structures: wider invasions and/or narrow filopodia that contain long linear filaments. Consistent with this, formin Diaphanous (Dia) and branched actin nucleator, Arp3, are found decorating the filopodia or enriched at the actin focus, respectively, indicating that linear actin is present along with branched actin at sites of fusion in the FCM. Gain-of-function Dia and loss-of-function Arp3 both lead to fusion defects, a decrease of F-actin foci and prominent filopodia from the FCMs. We also observed differential endocytosis of cell surface components at sites of fusion, with actin reorganizing factors, WASp and SCAR, and Kirre remaining on the myotube surface and Sns preferentially taken up with other membrane proteins into early endosomes and lysosomes in the myotube.
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Affiliation(s)
- Shruti Haralalka
- Stowers Institute for Medical Research, Kansas City, Missouri, 64110, United States of America
| | - Claude Shelton
- Stowers Institute for Medical Research, Kansas City, Missouri, 64110, United States of America
| | - Heather N. Cartwright
- Stowers Institute for Medical Research, Kansas City, Missouri, 64110, United States of America
| | - Fengli Guo
- Stowers Institute for Medical Research, Kansas City, Missouri, 64110, United States of America
| | - Rhonda Trimble
- Stowers Institute for Medical Research, Kansas City, Missouri, 64110, United States of America
| | - Ram P. Kumar
- Stowers Institute for Medical Research, Kansas City, Missouri, 64110, United States of America
| | - Susan M. Abmayr
- Stowers Institute for Medical Research, Kansas City, Missouri, 64110, United States of America
- Department of Anatomy and Cell Biology, University of Kansas School of Medicine, Kansas City, Kansas, 66160, United States of America
- * E-mail:
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31
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Abele TA, Besachio DA, Quigley EP, Gurgel RK, Shelton C, Harnsberger HR, Wiggins RH. Diagnostic accuracy of screening MR imaging using unenhanced axial CISS and coronal T2WI for detection of small internal auditory canal lesions. AJNR Am J Neuroradiol 2014; 35:2366-70. [PMID: 25034778 DOI: 10.3174/ajnr.a4041] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE While enhanced T1WI is considered the "gold standard" for detection of internal auditory canal pathology, unenhanced fluid-sensitive sequences have shown high sensitivity for lesion identification. Our purpose was to evaluate the diagnostic accuracy of an unenhanced MR imaging protocol using axial CISS and coronal T2WI for detection of small (10 mm or less) internal auditory canal lesions. MATERIALS AND METHODS Twenty-three patients with small internal auditory canal lesions and 13 patients without lesions who had undergone MR imaging using the screening protocol and confirmatory gadolinium-enhanced thin section T1WI were identified. Two blinded neuroradiologists retrospectively evaluated all examinations using 1) only axial CISS, 2) only coronal T2WI, and 3) axial and coronal sequences together. Accuracy, specificity, sensitivity, and interobserver agreement were assessed. RESULTS Median maximum lesion dimension was 4 mm (range, 2-10 mm). Accuracy, specificity, and sensitivity for axial CISS alone were 0.94, 0.96, and 0.91 for observer 1 and 0.94, 0.92, and 1.00 for observer 2. The data for the coronal T2WI sequence only were 0.94, 0.96, and 0.91 for observer 1, and 0.99, 1.00, and 0.96 for observer 2. Using axial and coronal sequences, the data were 0.97, 0.96, and 1.00 for observer 1, and 0.99, 0.98, and 1.00 for observer 2. κ coefficients were 0.84 for the axial sequence only, 0.90 for coronal only, and 0.91 for axial and coronal both. CONCLUSIONS Screening noncontrast MR imaging using a combination of axial CISS and coronal T2WI sequences can detect small internal auditory canal lesions with 100% sensitivity and excellent interobserver agreement.
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Affiliation(s)
- T A Abele
- From the Departments of Radiology (T.A.A., E.P.Q., H.R.H., R.H.W.)
| | - D A Besachio
- Department of Radiology (D.A.B.), Naval Medical Center Portsmouth, Portsmouth, Virginia
| | - E P Quigley
- From the Departments of Radiology (T.A.A., E.P.Q., H.R.H., R.H.W.)
| | - R K Gurgel
- Division of Otolaryngology-Head and Neck Surgery (R.K.G., C.S., R.H.W.), University of Utah, Salt Lake City, Utah
| | - C Shelton
- Division of Otolaryngology-Head and Neck Surgery (R.K.G., C.S., R.H.W.), University of Utah, Salt Lake City, Utah
| | - H R Harnsberger
- From the Departments of Radiology (T.A.A., E.P.Q., H.R.H., R.H.W.)
| | - R H Wiggins
- From the Departments of Radiology (T.A.A., E.P.Q., H.R.H., R.H.W.) Biomedical Informatics (R.H.W.) Division of Otolaryngology-Head and Neck Surgery (R.K.G., C.S., R.H.W.), University of Utah, Salt Lake City, Utah
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Pavuk M, Olson JR, Wattigney WA, Dutton ND, Sjödin A, Shelton C, Turner WE, Bartell SM. Predictors of serum polychlorinated biphenyl concentrations in Anniston residents. Sci Total Environ 2014; 496:624-634. [PMID: 25115605 PMCID: PMC4617205 DOI: 10.1016/j.scitotenv.2014.06.113] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 05/30/2014] [Accepted: 06/25/2014] [Indexed: 05/22/2023]
Abstract
The Anniston Community Health Survey was a community-based cross-sectional study of Anniston, Alabama, residents who live in close proximity to a former PCB production facility to identify factors associated with serum PCB levels. The survey comprises 765 Anniston residents who completed a questionnaire interview and provided a blood sample for analysis in 2005-2007. Several reports based on data from the Anniston survey have been previously published, including associations between PCB exposure and diabetes and blood pressure. In this study we examine demographic, behavioral, dietary, and occupational characteristics of Anniston survey participants as predictors of serum PCB concentrations. Of the 765 participants, 54% were White and 45% were African-American; the sample was predominantly female (70%), with a mean age of 55 years. Serum PCB concentrations varied widely between participants (range for sum of 35 PCBs: 0.11-170.4 ng/g wet weight). Linear regression models with stepwise selection were employed to examine factors associated with serum PCBs. Statistically significant positive associations were observed between serum PCB concentrations and age, race, residential variables, current smoking, and local fish consumption, as was a negative association with education level. Age and race were the most influential predictors of serum PCB levels. A small age by sex interaction was noted, indicating that the increase in PCB levels with age was steeper for women than for men. Significant interaction terms indicated that the associations between PCB levels and having ever eaten locally raised livestock and local clay were much stronger among African-Americans than among White participants. In summary, demographic variables and past consumption of locally produced foods were found to be the most important predictors of PCB concentrations in residents living in the vicinity of a former PCB manufacturing facility.
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Affiliation(s)
- M Pavuk
- Agency for Toxic Substances and Disease Registry, Atlanta, GA, USA.
| | - J R Olson
- School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY, USA
| | - W A Wattigney
- Agency for Toxic Substances and Disease Registry, Atlanta, GA, USA
| | - N D Dutton
- Oak Ridge Institute for Science and Education (ORISE) Research Participant, Agency for Toxic Substances and Disease Registry, Atlanta, GA, USA
| | - A Sjödin
- National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - C Shelton
- College of Nursing, Jacksonville State University, Jacksonville, AL, USA
| | - W E Turner
- National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - S M Bartell
- Program in Public Health and Department of Statistics, University of California, Irvine, CA, USA
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Pavuk M, Olson JR, Sjödin A, Wolff P, Turner WE, Shelton C, Dutton ND, Bartell S. Serum concentrations of polychlorinated biphenyls (PCBs) in participants of the Anniston Community Health Survey. Sci Total Environ 2014; 473-474:286-97. [PMID: 24374590 PMCID: PMC4617226 DOI: 10.1016/j.scitotenv.2013.12.041] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Revised: 11/26/2013] [Accepted: 12/09/2013] [Indexed: 05/22/2023]
Abstract
Serum concentrations of 35 ortho-substituted polychlorinated biphenyl congeners (PCBs) were measured in 765 adults from Anniston, Alabama, where PCBs were manufactured between 1929 and 1971. As part of the Anniston Community Health Survey (ACHS), demographic data, questionnaire information, and blood samples were collected from participants in 2005-2007. Forty-six percent of study participants were African-American, 70% were female, and the median age was 56 years. The median concentration of the sum of 35 PCB congeners (ΣPCBs) was 528 ng/g lipid, with a 90th percentile of 2,600 ng/g lipid, minimum of 17.0 ng/g lipid, and maximum of 27,337 ng/g lipid. The least square geometric mean ΣPCBs was more than 2.5 times higher for African-American participants than for White participants (866 ng/g lipid vs. 331 ng/g lipid); this difference did not change materially after adjustment for age, sex, body mass index (BMI) and current smoking. In spite of large differences in absolute PCB levels, relative contributions of individual congeners to ΣPCBs were quite similar between race groups. Nevertheless, while percent contributions to ΣPCBs for most of the most abundant penta- to heptachlorobiphenyls were higher among African-Americans, the percentages were higher in Whites for the lower-chlorinated PCBs 28 and 74 and for octa- to decachlorinated PCBs. No major differences were observed in geometric mean ΣPCBs between women and men when adjusted for age, race, BMI and current smoking (516 ng/g lipid vs. 526 ng/g lipid). Principal component analysis revealed groups of co-varying congeners that appear to be determined by chlorine substitution patterns. These congener groupings were similar between ACHS participants and the National Health and Nutrition Examination Survey (NHANES) 2003-04 sample of the general United States population, despite ACHS participants having serum concentrations of ΣPCBs two to three times higher than those in comparable age and race groups from NHANES.
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Affiliation(s)
- M Pavuk
- Agency for Toxic Substances and Disease Registry, Atlanta, GA, USA.
| | - J R Olson
- State University of New York at Buffalo, Buffalo, NY, USA
| | - A Sjödin
- National Center for Environmental Health, Atlanta, GA, USA
| | - P Wolff
- University of Alabama at Birmingham, Birmingham, AL, USA
| | - W E Turner
- National Center for Environmental Health, Atlanta, GA, USA
| | - C Shelton
- Jacksonville State University, AL, USA
| | - N D Dutton
- Oak Ridge Institute for Science and Education (ORISE) Research Participation Program, Agency for Toxic Substances and Disease Registry, Atlanta, GA, USA
| | - S Bartell
- University of California, Irvine, CA, USA
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Haralalka S, Shelton C, Cartwright HN, Katzfey E, Janzen E, Abmayr SM. Asymmetric Mbc, active Rac1 and F-actin foci in the fusion-competent myoblasts during myoblast fusion in Drosophila. Development 2013. [DOI: 10.1242/dev.092379] [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: 11/20/2022]
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35
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Salzman KL, Childs AM, Davidson HC, Kennedy RJ, Shelton C, Harnsberger HR. Intralabyrinthine schwannomas: imaging diagnosis and classification. AJNR Am J Neuroradiol 2011; 33:104-9. [PMID: 22158921 DOI: 10.3174/ajnr.a2712] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE ILS is a rare lesion that has a different management from the more common "acoustic" schwannoma. To date, only 137 cases have been reported. We present a classification scheme based on labyrinthine anatomy to describe and localize these lesions. Treatment and prognosis hinge on the appropriate localization of these tumors; thus, a concise terminology that can be used by both the otolaryngologist and radiology communities is desirable. MATERIALS AND METHODS After approval of the institutional review board, a retrospective study of all patients with the diagnosis of ILS imaged between 1996 and 2010 was performed. Clinical and imaging data were collected. Patients were imaged with thin-section high-resolution T2 and contrast-enhanced MR imaging. RESULTS There were 45 patients with a diagnosis of ILS. Forty-three had complete histories. There were 18 male and 25 female patients with an age range of 21-78 years with a mean age of 53 years. The most common presenting symptom was progressive sensorineural hearing loss. Lesions were characterized on the basis of their location. Intracochlear was most common (14/45) followed by transmodiolar (13/45), intravestibular (7/45), vestibulocochlear (5/45), transmacular (4/45), and transotic (2/45). Sixteen patients underwent surgical resection. The remaining patients were followed clinically and by serial MR imaging. CONCLUSIONS ILS is an uncommon but under-reported tumor. We characterized the MR imaging appearance of these tumors by using high-resolution techniques. In addition, an anatomically based classification system is presented that will help the radiologist accurately describe ILS within the inner ear and help the surgeon determine which tumors are potential surgical candidates.
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Affiliation(s)
- K L Salzman
- Department of Radiology, University of Utah, Salt Lake City, 84132-2140, USA.
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Haralalka S, Shelton C, Cartwright HN, Katzfey E, Janzen E, Abmayr SM. Asymmetric Mbc, active Rac1 and F-actin foci in the fusion-competent myoblasts during myoblast fusion in Drosophila. Development 2011; 138:1551-62. [PMID: 21389053 DOI: 10.1242/dev.057653] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Myoblast fusion is an intricate process that is initiated by cell recognition and adhesion, and culminates in cell membrane breakdown and formation of multinucleate syncytia. In the Drosophila embryo, this process occurs asymmetrically between founder cells that pattern the musculature and fusion-competent myoblasts (FCMs) that account for the bulk of the myoblasts. The present studies clarify and amplify current models of myoblast fusion in several important ways. We demonstrate that the non-conventional guanine nucleotide exchange factor (GEF) Mbc plays a fundamental role in the FCMs, where it functions to activate Rac1, but is not required in the founder cells for fusion. Mbc, active Rac1 and F-actin foci are highly enriched in the FCMs, where they localize to the Sns:Kirre junction. Furthermore, Mbc is crucial for the integrity of the F-actin foci and the FCM cytoskeleton, presumably via its activation of Rac1 in these cells. Finally, the local asymmetric distribution of these proteins at adhesion sites is reminiscent of invasive podosomes and, consistent with this model, they are enriched at sites of membrane deformation, where the FCM protrudes into the founder cell/myotube. These data are consistent with models promoting actin polymerization as the driving force for myoblast fusion.
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Affiliation(s)
- Shruti Haralalka
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA
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Flesch L, Demmel K, Davies S, Nagarajan R, Hawkins D, Hutchinson N, Bierman L, Fellers E, Hodapp S, O'Hara E, Shelton C, Curry C, Giesken R, Spear S, Wheeler D, Giaccone M. The Power of Process Improvement Methodology on a Highly Complex Pediatric Bone Marrow Transplant Unit's Catheter Associated Blood Stream Infection Rates. Biol Blood Marrow Transplant 2011. [DOI: 10.1016/j.bbmt.2010.12.650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Shelton C, Kocherlakota KS, Zhuang S, Abmayr SM. The immunoglobulin superfamily member Hbs functions redundantly with Sns in interactions between founder and fusion-competent myoblasts. Development 2009; 136:1159-68. [PMID: 19270174 DOI: 10.1242/dev.026302] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The body wall muscle of a Drosophila larva is generated by fusion between founder cells and fusion-competent myoblasts (FCMs). Initially, a founder cell recognizes and fuses with one or two FCMs to form a muscle precursor, then the developing syncitia fuses with additional FCMs to form a muscle fiber. These interactions require members of the immunoglobulin superfamily (IgSF), with Kin-of-IrreC (Kirre) and Roughest (Rst) functioning redundantly in the founder cell and Sticks-and-stones (Sns) serving as their ligand in the FCMs. Previous studies have not resolved the role of Hibris (Hbs), a paralog of Sns, suggesting that it functions as a positive regulator of myoblast fusion and as a negative regulator that antagonizes the activity of Sns. The results herein resolve this issue, demonstrating that sns and hbs function redundantly in the formation of several muscle precursors, and that loss of one copy of sns enhances the myoblast fusion phenotype of hbs mutants. We further show that excess Hbs rescues some fusion in sns mutant embryos beyond precursor formation, consistent with its ability to drive myoblast fusion, but show using chimeric molecules that Hbs functions less efficiently than Sns. In conjunction with a physical association between Hbs and SNS in cis, these data account for the previously observed UAS-hbs overexpression phenotypes. Lastly, we demonstrate that either an Hbs or Sns cytodomain is essential for muscle precursor formation, and signaling from IgSF members found exclusively in the founder cells is not sufficient to direct precursor formation.
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Affiliation(s)
- Claude Shelton
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA
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Hamilton BE, Salzman KL, Patel N, Wiggins RH, Macdonald AJ, Shelton C, Wallace RC, Cure J, Harnsberger HR. Imaging and clinical characteristics of temporal bone meningioma. AJNR Am J Neuroradiol 2006; 27:2204-9. [PMID: 17110695 PMCID: PMC7977196] [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: 05/12/2023]
Abstract
BACKGROUND AND PURPOSE Imaging characteristics of temporal bone meningioma have not been previously reported in the literature. CT and MR imaging findings in 13 cases of temporal bone meningioma are reviewed to define specific imaging features. METHODS A retrospective review of our institutional case archive revealed 13 cases of histologically confirmed temporal bone meningioma. CT and MR imaging studies were reviewed to characterize mass location, vector of spread, bone changes, enhancement characteristics, and intracranial patterns of involvement. Clinical presenting signs and symptoms were correlated with imaging findings. RESULTS Thirteen temporal bone meningiomas were reviewed in 8 women and 5 men, aged 18-65 years. Meningiomas were stratified into 3 groups on the basis of location and tumor vector of spread. There were 6 tegmen tympani, 5 jugular foramen (JF), and 2 internal auditory canal (IAC) meningiomas. Tegmen tympani and JF meningiomas were characterized by spread to the middle ear cavity. IAC meningiomas, by contrast, spread to the cochlea and vestibule. Hearing loss was the most common clinical presenting feature in all cases of temporal bone meningioma (10/13). The presence of tumor adjacent to the ossicles strongly correlated with conductive hearing loss (7/9). CONCLUSION Meningioma involving the temporal bone is rare. Three subgroups of meningioma exist in this location: tegmen tympani, JF, and IAC meningioma. Tegmen tympani and JF meningiomas spread to the middle ear cavity. IAC meningiomas spread to intralabyrinthine structures. Conductive hearing loss is commonly seen in these patients and can be surgically correctable.
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Affiliation(s)
- B E Hamilton
- Department of Radiology, University of Utah, Salt Lake City, Utah, USA.
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Wiggins RH, Harnsberger HR, Salzman KL, Shelton C, Kertesz TR, Glastonbury CM. The many faces of facial nerve schwannoma. AJNR Am J Neuroradiol 2006; 27:694-9. [PMID: 16552018 PMCID: PMC7976970] [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: 05/07/2023]
Abstract
BACKGROUND AND PURPOSE The imaging appearance of facial nerve schwannomas (FNSs) has been described as an enhancing tubular mass (using T1-enhanced MR) within an enlarged facial nerve canal (using CT). The purpose of this study is to identify how often the FNS imaging findings conform to this description and determine whether there are underlying anatomic explanations for the discrepant imaging appearances identified. MATERIALS AND METHODS The clinical, pathologic, and radiologic records of 24 FNS in 23 patients were retrospectively reviewed. Each FNS was evaluated for location along the facial nerve. The lesions were cataloged by facial nerve segment with the imaging characteristics of each segment described. RESULTS The average age at time of first imaging was 39 years (age range, 10-70 years). Eighteen (71%) of the 24 FNSs were pathologically confirmed, while the others were determined intraoperatively or diagnostically by the presence of both enlargement of the facial nerve canal and enhancement on contrast-enhanced T1 MR examination. The most common location was in the geniculate fossa (83%), followed by the labyrinthine and tympanic segments of the facial nerve (both 54%). The most common clinical presentation was facial neuropathy (42%). CONCLUSION The classic description of FNS on enhanced T1 MR is that of a well-circumscribed fusiform enhancing mass along the course of the intratemporal facial nerve with bone algorithm CT showing sharply defined bony canal enlargement. Modern imaging techniques, however, demonstrate the importance of the surrounding anatomic landscape, leading to various imaging appearances. Lesions traversing the labyrinthine segment can demonstrate a dumbbell appearance. When FNSs track along the greater superficial petrosal nerve, they may present as a round mass projecting up into the middle cranial fossa. FNS of the tympanic segment of the facial nerve preferentially pedunculate into the middle ear cavity, clinically presenting as a middle ear mass. When the mastoid segment of the facial nerve is involved, irregular and "invasive" tumor margins seen on MR can be explained on CT as tumor breaking into surrounding mastoid air cells.
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Affiliation(s)
- R H Wiggins
- Department of Radiology, Division of Neuroradiology, University of Utah, Salt Lake City, Utah 84132-1140, USA
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Sandercock GRH, Shelton C, Bromley P, Brodie DA. Agreement between three commercially available instruments for measuring short-term heart rate variability. Physiol Meas 2004; 25:1115-24. [PMID: 15535178 DOI: 10.1088/0967-3334/25/5/003] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Numerous instruments are commercially available to measure heart rate variability, yet little is known regarding the agreement between such instruments. The objective of this study is to assess agreement between measures of heart rate variability in three commercially available instruments. Thirty subjects (20 males) of median age 27.5 (range 19-59 years) underwent simultaneous ECG recordings, under three different resting conditions: supine, standing and supine with controlled breathing, using three commercially available analysers. Intraclass correlation coefficients tended to show excellent agreement (lower 95% C.I., R > 0.75) between all instruments under all conditions. However, further analysis of selected measurements using the limits of agreement method revealed large variation in values generated by all instruments. There was also an evidence of systematic bias between one instrument and the remaining two. The latter finding was due to discrepant ECG recording protocols that were unrelated to consistent operator timing. This study demonstrates that measures of HRV generated by the three instruments did not agree well in all cases. Discrepancies were due to the recording protocols of the systems. This may lead to incomparable results between instruments. It is therefore recommended that: (a) if different instruments are used in the same study or (b) multi-centre study designs are planned or (c) heart rate variability results are discussed with reference to studies using other instruments, levels of agreement need to be reported to ensure comparability.
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Affiliation(s)
- G R H Sandercock
- Research Centre for Health Studies, Buckinghamshire Chilterns University College, Newlands Park, Chalfont St Giles, Buckinghamshire, HP8 4AD, UK
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Williams G, Chaboyer W, Thornsteindóttir R, Fulbrook P, Shelton C, Wojner A, Chan D. Worldwide overview of critical care nursing organizations and their activities. Int Nurs Rev 2001; 48:208-17. [PMID: 11775754 DOI: 10.1046/j.1466-7657.2001.00100.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
While critical care has been a specialty within nursing for almost 50 years, with many countries having professional organizations representing these nurses, it is only recently that the formation of an international society has been considered. A three-phased study was planned: the aim of the first phase was to identify critical care organizations worldwide; the aim of the second was to describe the characteristics of these organizations, including their issues and activities; and the aim of the third was to plan for an international society, if international support was evident. In the first phase, contacts in 44 countries were identified using a number of strategies. In the second phase, 24 (55%) countries responded to a survey about their organizations. Common issues for critical care nurses were identified, including concerns over staffing levels, working conditions, educational programme standards and wages. Critical care nursing organizations were generally favourable towards the notion of establishing a World Federation of their respective societies. Some of the important issues that will need to be addressed in the lead up to the formation of such a federation are now being considered.
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Moore KR, Fischbein NJ, Harnsberger HR, Shelton C, Glastonbury CM, White DK, Dillon WP. Petrous apex cephaloceles. AJNR Am J Neuroradiol 2001; 22:1867-71. [PMID: 11733318 PMCID: PMC7973833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
BACKGROUND AND PURPOSE Petrous apex cephaloceles (PACs) are uncommon lesions that are usually incidental but may be symptomatic. We reviewed MR and CT studies in 10 patients with PACs to identify characteristic imaging features that facilitate their diagnosis. METHODS MR and CT studies from 10 patients with PACs were reviewed retrospectively. In each case the PAC was characterized by lesion center, signal intensity or attenuation, adjacent petrous apex pneumatization, and its relationship to Meckel's cave. Intraoperative findings were reviewed in the three cases in which surgery was performed. RESULTS All 10 patients had lobulated expansile cystic petrous apex lesions centered along the posterolateral margin of Meckel's cave. All cysts were contiguous with Meckel's cave. Three patients had bilateral PACs. Four patients had symptoms that could potentially be explained by the PAC, while findings in the other six were incidental observations. Three patients underwent surgery, during which two lesions were diagnosed as meningoceles while the third was diagnosed as an arachnoid cyst protruding through a dural defect. CONCLUSION PACs represent a protrusion of meninges and CSF from the posterolateral portion of Meckel's cave into the petrous apex, which is their characteristic imaging appearance. PACs are usually incidental but may be symptomatic. Surgical intervention should be approached cautiously and undertaken only when symptoms are clearly linked to the presence of this lesion.
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Affiliation(s)
- K R Moore
- Department of Radiology, University of Utah School of Medicine, Salt Lake City 84132, USA
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Salzman KL, Davidson HC, Harnsberger HR, Glastonbury CM, Wiggins RH, Ellul S, Shelton C. Dumbbell schwannomas of the internal auditory canal. AJNR Am J Neuroradiol 2001; 22:1368-76. [PMID: 11498429 PMCID: PMC7975197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
BACKGROUND AND PURPOSE Benign tumors of the internal auditory canal (IAC) may leave the confines of the IAC fundus and extend into inner ear structures, forming a dumbbell-shaped lesion. It is important to differentiate dumbbell lesions, which include facial and vestibulocochlear schwannomas, from simple intracanalicular schwannomas, as surgical techniques and prognostic implications are affected. In this article, the imaging and clinical features of these dumbbell schwannomas are described. METHODS A dumbbell lesion of the IAC is defined as a mass with two bulbous segments, one in the IAC fundus and the other in the membranous labyrinth of the inner ear or the geniculate ganglion of the facial nerve canal, spanned by an isthmus. Twenty-four patients with dumbbell lesions of the IAC had their clinical and imaging data retrospectively reviewed. Images were evaluated for contour of the mass and extension into the membranous labyrinth or geniculate ganglion. RESULTS Ten of 24 lesions were facial nerve dumbbell lesions. Characteristic features included an enhancing "tail" along the labyrinthine segment of the facial nerve and enlargement of the facial nerve canal. Dumbbell schwannomas of the vestibulocochlear nerve (14/24) included transmodiolar (8/14), which extended into the cochlea, transmacular (2/14), which extended into the vestibule, and combined transmodiolar/transmacular (4/14) types. CONCLUSION Simple intracanalicular schwannomas can be differentiated from transmodiolar, transmacular, and facial nerve schwannomas with postcontrast and high-resolution fast spin-echo T2-weighted MR imaging. Temporal bone CT is reserved for presurgical planning in the dumbbell facial nerve schwannoma group.
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Affiliation(s)
- K L Salzman
- Department of Diagnostic Radiology, University of Utah, 1A71 Medical Center, 50 North Medical Drive, Salt Lake City, UT 84132, USA
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Kertesz TR, Shelton C, Wiggins RH, Salzman KL, Glastonbury CM, Harnsberger R. Intratemporal facial nerve neuroma: anatomical location and radiological features. Laryngoscope 2001; 111:1250-6. [PMID: 11568549 DOI: 10.1097/00005537-200107000-00020] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES To present the imaging findings and anatomical locations of a series of 88 facial nerve neuromas from two centers over a 30-year period. We describe the salient radiological features of neuromas in each anatomical location and outline the ways in which modern imaging techniques have altered our perception of this entity. STUDY DESIGN A retrospective review of tumors presenting to two tertiary care referral institutions since 1970. METHODS The charts and available imaging of patients with the diagnosis of facial neuroma were reviewed. These patients presented to the House Ear Clinic between 1970 and 1994 and to the University of Utah Medical Center (Salt Lake City, UT) between 1986 and August 2000. We examined anatomical location to determine patterns of tumor presentation and compared the findings before and after the era of magnetic resonance imaging (MRI). RESULTS All segments of the facial nerve were represented. Overall, multiple-segment tumors were almost twice as common (63.6%) as single-segment tumors (36.4%). Before the advent of MRI, all segments of the nerve from the cerebellopontine angle to the tympanic portion were almost equally represented (29.5%-36.3%). After MRI, the geniculate ganglion (68.2%) and labyrinthine portion (52.3%) were by far the most commonly affected areas. Before MRI, there were, on average, 1.89 segments involved per tumor. After MRI, this average number increased to 2.57 segments per tumor. Radiologically, the high-resolution computed tomography and MRI features cannot be generalized. Rather, the imaging features depend on which segments are involved. This is because of the variation in the surrounding anatomical landscape of the facial nerve in its course through the temporal bone. CONCLUSION The more sensitive imaging provided by newer radiological techniques has altered our perception of facial neuroma. It has provided us with an increased ability to diagnose and fully evaluate this neoplasm preoperatively, allowing improved patient counseling and surgical planning.
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Affiliation(s)
- T R Kertesz
- Department of Otolaryngology, University of Utah Medical School, Salt Lake City, Utah 84132, USA
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Abstract
OBJECTIVE To determine the efficacy of topical dexamethasone in reducing nerve dysfunction after axonotmesis injury. STUDY DESIGN A three-armed, blinded study including sham, control, and test groups was designed using the rat sciatic nerve crush injury model. METHODS Twenty-two rats were randomly assigned to a control group or a topical steroid group. A standardized sciatic nerve crush injury was performed under sterile conditions on each animal. A separate group of five rats underwent a sham operation to isolate the crush injury as the source of postoperative dysfunction in the control and steroid groups. All animals underwent walking track analysis with calculation of the sciatic functional index (SFI) before surgery and through the postoperative recovery period. Dexamethasone saturated Gelfoam was placed at the site of injury in the topical steroid group. The functional performance of each group was compared throughout the recovery period. RESULTS No morbidity associated with topical application of steroids at the injury site was noted. The topical steroid group had improved recovery at postoperative days 14, 18, and 22. This difference was statistically significant at day 14. At the termination of the study, there was a clear trend toward superior recovery for the steroid group compared with controls (90% vs. 73%), but this difference did not reach statistical significance. CONCLUSIONS Clinical use of topical steroids to reduce postoperative nerve dysfunction warrants further study.
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Affiliation(s)
- E B Galloway
- Division of Otolaryngology, University of Utah, Salt Lake City, USA
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Ellul S, Shelton C, Davidson HC, Harnsberger HR. Preoperative cochlear implant imaging: is magnetic resonance imaging enough? Am J Otol 2000; 21:528-33. [PMID: 10912699] [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: 02/17/2023]
Abstract
OBJECTIVE To investigate the accuracy of magnetic resonance imaging (MRI) as a preoperative imaging technique for cochlear implant candidates. STUDY DESIGN Retrospective, blinded. SETTING Tertiary medical center. PATIENTS 31 cochlear implant candidates with various causes of hearing loss. INTERVENTION Cochlear implant patients received preoperative high-resolution temporal bone computed tomography (CT), and high-resolution T2-weighted fast spin echo MRI (FSE-MRI). The images were read independently of each other and in a blinded manner by two neuroradiologists. The imaging results were also correlated with intraoperative findings. MAIN OUTCOME MEASURES Lack of agreement between the findings for either imaging technique; also, lack of agreement between imaging findings and intraoperative findings. RESULTS FSE-MRI is equal to CT imaging in the detection of abnormalities of cochlear patency. It is better than CT imaging in detecting cochlear dysplasia and large vestibular aqueducts, and in determining the presence of the cochlear nerve. CONCLUSION FSE-MRI is accurate in predicting inner ear anomalies and obstruction of the cochlear lumen. It also adds information not gathered from CT imaging, such as the presence and size of the cochlear nerve.
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Affiliation(s)
- S Ellul
- Division of Otolaryngology-Head and Neck Surgery, University of Utah, Salt Lake City, USA
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Shelton C. Preoperative identification of the facial nerve achieved using fast spin-echo MR imaging: can it help the surgeon? AJNR Am J Neuroradiol 2000; 21:805. [PMID: 10815650 PMCID: PMC7976735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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Daniels RL, Swallow C, Shelton C, Davidson HC, Krejci CS, Harnsberger HR. Causes of unilateral sensorineural hearing loss screened by high-resolution fast spin echo magnetic resonance imaging: review of 1,070 consecutive cases. Am J Otol 2000; 21:173-80. [PMID: 10733180 DOI: 10.1016/s0196-0709(00)80005-8] [Citation(s) in RCA: 41] [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: 11/17/2022]
Abstract
OBJECTIVE Evaluation of the ability of screening high-resolution, nonenhanced, fast spin echo (FSE) T2-weighted magnetic resonance imaging (MRI) of the internal auditory canal (IAC) and cerebellopontine angle (CPA) to detect nonacoustic schwannoma causes of unilateral sensorineural hearing loss (SNHL). FSE-MRI is equally sensitive in detecting acoustic (vestibular) schwannoma as gadolinium-enhanced MRI, but sensitivity to other causes of hearing loss is unknown. STUDY DESIGN Retrospective review of screening FSE-MRI studies. SETTING Academic otology/neurotology and neuroradiology practices. PATIENTS There were 1,070 patients with unilateral SNHL who underwent radiologic screening for retrocochlear pathology. RESULTS Normal findings were found in 944 cases. Typical (acoustic) vestibular schwannoma were found in 56 patients. Seventy additional lesions were identified: 27 CPA lesions, 29 inner ear lesions, and 12 intraaxial lesions including 9 infarctions, 1 multiple sclerosis case, 1 mesial temporal lobe sclerosis, and 1 colloid cyst. CONCLUSIONS High-resolution T2 FSE-MRI of the IAC and CPA is a highly sensitive screening tool for unilateral SNHL, which can detect a variety of lesions in addition to vestibular schwannomas. To our knowledge in 2 years of follow-up in these patients screened for IAC/CPA lesions, no other lesions causing SNHL have been found. High-resolution FSE screening technique, used in conjunction with appropriate clinical prescreening and referral, can provide an equally sensitive method of evaluating unilateral SNHL compared to gadolinium-enhanced T1 MRI while reducing costs and providing distinct advantages in evaluating nonacoustic schwannoma causes of SNHL.
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Affiliation(s)
- R L Daniels
- The Ohio State University, Department of Otolaryngology, Columbus, USA
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Merline WJ, Close LM, Dumas C, Chapman CR, Roddier F, Ménard F, Slater DC, Duvert G, Shelton C, Morgan T. Discovery of a moon orbiting the asteroid 45 Eugenia. Nature 1999. [DOI: 10.1038/44089] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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