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Kleinman MB, Hines AC, Anvari MS, Bradley VD, Shields A, Dean D, Abidogun TM, Jack HE, Magidson JF. "You rise up and then you start pulling people up with you": Patient experiences with a peer-delivered behavioral activation intervention to support methadone treatment. Int J Drug Policy 2023; 122:104234. [PMID: 37866292 PMCID: PMC10872983 DOI: 10.1016/j.drugpo.2023.104234] [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: 03/02/2023] [Revised: 10/06/2023] [Accepted: 10/07/2023] [Indexed: 10/24/2023]
Abstract
BACKGROUND Although medications for opioid use disorder (MOUD) are efficacious treatments for opioid use disorder, retention remains low. Peer recovery specialists (PRSs), individuals with lived substance use and recovery experience, may be particularly well-suited to support patients receiving MOUD. While PRSs are rarely trained in evidence-based behavioral interventions other than motivational interviewing, preliminary evidence suggests that peers can deliver brief behavioral interventions, such as behavioral activation, with efficacy and fidelity. This qualitative study sought to explore patient perspectives on receiving an adapted PRS-delivered behavioral activation intervention (Peer Activate) to support patients receiving methadone treatment. METHODS The sample (N = 26) included patients recently starting or demonstrating challenges with adherence at a community-based methadone treatment program who received the Peer Activate intervention in a pilot trial. Participants were invited to participate in in-depth, semi-structured interviews at study completion or discontinuation, assessing perceived acceptability and feasibility of Peer Activate, and stigma-related barriers. Interview transcripts were coded using codebook/template thematic analysis. RESULTS Analysis revealed the importance of two areas to promote intervention acceptability: 1) connection with intervention content and skill building, and 2) valued PRS-specific qualities. Intervention flexibility was found to promote feasibility of the intervention in the context of chaotic and challenging life circumstances. Additionally, participants described stigma towards substance use and methadone treatment as potential barriers to engaging in methadone treatment. CONCLUSION Results support the acceptability and feasibility to patients of this PRS-delivered behavioral activation intervention in the context of outpatient MOUD treatment among a low-income, majority racially minoritized patient population. Future intervention adaptation and implementation should focus on incorporating content related to relationships and interpersonal skills; balancing behavioral intervention content with system navigation support; maintaining flexibility; and further investigation of the impact of individual PRS attributes, including shared lived experiences, on intervention acceptability and shifts in stigma.
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Affiliation(s)
- Mary B Kleinman
- Department of Psychology, University of Maryland, College Park, MD, USA.
| | - Abigail C Hines
- Department of Psychology, University of Maryland, College Park, MD, USA
| | - Morgan S Anvari
- Department of Psychology, University of Maryland, College Park, MD, USA
| | - Valerie D Bradley
- Department of Psychology, University of Maryland, College Park, MD, USA
| | - Alia Shields
- Department of Psychology, University of Maryland, College Park, MD, USA
| | - Dwayne Dean
- Department of Psychology, University of Maryland, College Park, MD, USA
| | | | - Helen E Jack
- Division of General Internal Medicine, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Jessica F Magidson
- Department of Psychology, University of Maryland, College Park, MD, USA; Center for Substance Use, Addiction & Health Research (CESAR), University of Maryland, College Park, MD, USA
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Felton JW, Kleinman MB, Doran K, Satinsky EN, Tralka H, Dean D, Brown CJS, Anvari MS, Bradley VD, Magidson JF. Peer Activate: A Feasibility Trial of a Peer-Delivered Intervention to Decrease Disparities in Substance Use, Depression, and Linkage to Substance Use Treatment. J Psychosoc Nurs Ment Health Serv 2023; 61:23-31. [PMID: 37256749 DOI: 10.3928/02793695-20230523-02] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Although effective evidence-based interventions (EBIs) exist, racial/ethnic minority individuals with lower income are less likely to have access to these interventions and may experience greater stigma in the health care system, resulting in disproportionate rates of morbidity and mortality. Peer recovery specialists (PRSs) may be uniquely suited to address barriers faced by those from impoverished areas; however, peers have not traditionally been trained in implementing EBIs. The current open-label trial (N = 8) was performed to evaluate implementation and preliminary effectiveness of an adapted EBI supporting recovery, linkage to treatment, and reduced depression. Results suggest the intervention was feasible, acceptable, and appropriate for linking individuals from a community setting to substance use treatment and could be delivered with fidelity by a peer interventionist. Participants who completed the intervention demonstrated clinically reliable decreases in substance use and depressive symptoms. Findings provide initial support for PRS dissemination of EBIs to increase linkage to care and support recovery in traditionally underserved populations. [Journal of Psychosocial Nursing and Mental Health Services, 61(11), 23-31.].
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Kleinman MB, Anvari MS, Bradley VD, Felton JW, Belcher AM, Seitz-Brown CJ, Greenblatt AD, Dean D, Bennett M, Magidson JF. "Sometimes you have to take the person and show them how": adapting behavioral activation for peer recovery specialist-delivery to improve methadone treatment retention. Subst Abuse Treat Prev Policy 2023; 18:15. [PMID: 36879304 PMCID: PMC9990281 DOI: 10.1186/s13011-023-00524-3] [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: 07/08/2022] [Accepted: 02/22/2023] [Indexed: 03/08/2023] Open
Abstract
BACKGROUND Despite efficacy of medication for opioid use disorder, low-income, ethno-racial minoritized populations often experience poor opioid use disorder treatment outcomes. Peer recovery specialists, individuals with lived experience of substance use and recovery, are well-positioned to engage hard-to-reach patients in treatment for opioid use disorder. Traditionally, peer recovery specialists have focused on bridging to care rather than delivering interventions. This study builds on research in other low-resource contexts that has explored peer delivery of evidence-based interventions, such as behavioral activation, to expand access to care. METHODS We sought feedback on the feasibility and acceptability of a peer recovery specialist-delivered behavioral activation intervention supporting retention in methadone treatment by increasing positive reinforcement. We recruited patients and staff at a community-based methadone treatment center and peer recovery specialist working across Baltimore City, Maryland, USA. Semi-structured interviews and focus groups inquired about the feasibility and acceptability of behavioral activation, recommendations for adaptation, and acceptability of working with a peer alongside methadone treatment. RESULTS Participants (N = 32) shared that peer recovery specialist-delivered behavioral activation could be feasible and acceptable with adaptations. They described common challenges associated with unstructured time, for which behavioral activation could be particularly relevant. Participants provided examples of how a peer-delivered intervention could fit well in the context of methadone treatment, emphasizing the importance of flexibility and specific peer qualities. CONCLUSIONS Improving medication for opioid use disorder outcomes is a national priority that must be met with cost-effective, sustainable strategies to support individuals in treatment. Findings will guide adaptation of a peer recovery specialist-delivered behavioral activation intervention to improve methadone treatment retention for underserved, ethno-racial minoritized individuals living with opioid use disorder.
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Affiliation(s)
- Mary B Kleinman
- Department of Psychology, University of Maryland at College Park, College Park, Maryland, USA.
| | - Morgan S Anvari
- Department of Psychology, University of Maryland at College Park, College Park, Maryland, USA
| | - Valerie D Bradley
- Department of Psychology, University of Maryland at College Park, College Park, Maryland, USA
| | - Julia W Felton
- Center for Health Policy and Health Services Research, Henry Ford Health System, Detroit, MI, USA
| | - Annabelle M Belcher
- Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, USA
| | - C J Seitz-Brown
- Department of Psychology, University of Maryland at College Park, College Park, Maryland, USA
| | - Aaron D Greenblatt
- Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Dwayne Dean
- Department of Psychology, University of Maryland at College Park, College Park, Maryland, USA
| | - Melanie Bennett
- Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Jessica F Magidson
- Department of Psychology, University of Maryland at College Park, College Park, Maryland, USA
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Anvari MS, Kleinman MB, Dean D, Rose AL, Bradley VD, Hines AC, Abidogun TM, Felton JW, Magidson JF. A Pilot Study of Training Peer Recovery Specialists in Behavioral Activation in the United States: Preliminary Outcomes and Predictors of Competence. Int J Environ Res Public Health 2023; 20:3902. [PMID: 36900912 PMCID: PMC10001483 DOI: 10.3390/ijerph20053902] [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] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 02/17/2023] [Accepted: 02/19/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND The peer recovery specialist (PRS) workforce has rapidly expanded to increase access to substance-use disorder services for underserved communities. PRSs are not typically trained in evidence-based interventions (EBIs) outside of motivational interviewing, although evidence demonstrates the feasibility of PRS delivery of certain EBIs, such as a brief behavioral intervention, behavioral activation. However, characteristics that predict PRS competency in delivering EBIs such as behavioral activation remain unknown, and are critical for PRS selection, training, and supervision if the PRS role is expanded. This study aimed to explore the outcomes of a brief PRS training period in behavioral activation and identify predictors of competence. METHOD Twenty PRSs in the United States completed a two-hour training on PRS-delivered behavioral activation. Participants completed baseline and post-training assessments, including roleplay and assessments of PRS characteristics, attitudes towards EBIs, and theoretically relevant personality constructs. Roleplays were coded for competence (behavioral activation specific and PRS skills more broadly, i.e., PRS competence) and changes were assessed from baseline to post-training. Linear regression models tested factors predicting post-training competence, controlling for baseline competence. RESULTS There was a significant pre-post increase in behavioral activation competence (t = -7.02, p < 0.001). Years working as a PRS significantly predicted post-training behavioral activation skills (B = 0.16, p = 0.005). No variables predicted post-training PRS competence. CONCLUSIONS This study provides preliminary evidence that behavioral activation may be appropriate for dissemination to PRSs through brief trainings, particularly for PRSs with more work experience. However, additional research is needed to examine predictors of competence among PRSs.
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Affiliation(s)
- Morgan S. Anvari
- Department of Psychology, University of Maryland, College Park, College Park, MD 20742, USA
| | - Mary B. Kleinman
- Department of Psychology, University of Maryland, College Park, College Park, MD 20742, USA
| | - Dwayne Dean
- Department of Psychology, University of Maryland, College Park, College Park, MD 20742, USA
| | - Alexandra L. Rose
- Department of Psychology, University of Maryland, College Park, College Park, MD 20742, USA
| | - Valerie D. Bradley
- Department of Psychology, University of Maryland, College Park, College Park, MD 20742, USA
| | - Abigail C. Hines
- Department of Psychology, University of Maryland, College Park, College Park, MD 20742, USA
| | - Tolulope M. Abidogun
- Department of Psychology, University of Maryland, College Park, College Park, MD 20742, USA
| | - Julia W. Felton
- Center for Health Policy & Health Services Research, Henry Ford Health System, Detroit, MI 48202, USA
| | - Jessica F. Magidson
- Department of Psychology, University of Maryland, College Park, College Park, MD 20742, USA
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Magidson JF, Kleinman MB, Bradley V, Anvari MS, Abidogun TM, Belcher AM, Greenblatt AD, Dean D, Hines A, Seitz-Brown CJ, Wagner M, Bennett M, Felton JW. Peer recovery specialist-delivered, behavioral activation intervention to improve retention in methadone treatment: Results from an open-label, Type 1 hybrid effectiveness-implementation pilot trial. Int J Drug Policy 2022; 108:103813. [PMID: 35932644 PMCID: PMC9590100 DOI: 10.1016/j.drugpo.2022.103813] [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: 03/23/2022] [Revised: 07/13/2022] [Accepted: 07/22/2022] [Indexed: 11/26/2022]
Abstract
BACKGROUND Despite the efficacy of methadone to treat opioid use disorder (OUD), retention is an urgent priority, particularly among low-income, minoritized populations. Peer recovery specialists are well-positioned to engage vulnerable patients, particularly when trained in an evidence-based intervention to promote retention. This hybrid effectiveness-implementation pilot trial aimed to demonstrate the proof of concept of a peer recovery specialist-delivered behavioral activation and problem solving-based approach (Peer Activate) to improve methadone retention. METHODS Implementation outcomes included feasibility, acceptability, and fidelity. Feasibility and acceptability were defined by the percentage of participants who initiated the intervention (≥75%) and completed ≥75% of core sessions, respectively. Fidelity was assessed via independent rating of a randomly selected 20% of sessions. The primary effectiveness outcome was methadone retention at three-months post-intervention vs. a comparison cohort initiating methadone during the same time period. Secondary outcomes included methadone adherence, substance use frequency, and substance use-related problems. RESULTS Benchmarks for feasibility and acceptability were surpassed: 86.5% (32/37) initiated the intervention, and 81.3% of participants who initiated attended ≥75% of core sessions. The mean independent rater fidelity score was 87.9%, indicating high peer fidelity. For effectiveness outcomes, 88.6% of participants in Peer Activate were retained in methadone treatment at three-months post-intervention-28.9% higher than individuals initiating methadone treatment alone in the same time period [χ2(1) = 10.10, p = 0.001]. Among Peer Activate participants, urine-verified methadone adherence reached 97% at post-intervention, and there was a significant reduction in substance use frequency from 48% of past two-week days used at baseline to 31.9% at post-intervention [t(25) = 1.82, p = .041]. Among participants who completed the core Peer Activate sessions (n = 26), there was a significant reduction in substance use-related problems [t(21) = 1.84, p = 0.040]. CONCLUSION Given the rapid scale-up of peer recovery specialist programs nationwide and the urgent need to promote methadone retention, these results, although preliminary, have important potential clinical significance. The next steps are to conduct a Type 1 hybrid effectiveness-implementation randomized trial with a larger sample size and longer-term follow-up to further establish the implementation and effectiveness of the Peer Activate approach.
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Affiliation(s)
- Jessica F Magidson
- Department of Psychology, University of Maryland, College Park, MD, USA.
| | - Mary B Kleinman
- Department of Psychology, University of Maryland, College Park, MD, USA
| | - Valerie Bradley
- Department of Psychology, University of Maryland, College Park, MD, USA
| | - Morgan S Anvari
- Department of Psychology, University of Maryland, College Park, MD, USA
| | | | | | | | - Dwayne Dean
- Department of Psychology, University of Maryland, College Park, MD, USA
| | - Abigail Hines
- Department of Psychology, University of Maryland, College Park, MD, USA
| | - C J Seitz-Brown
- Department of Psychology, University of Maryland, College Park, MD, USA
| | - Michael Wagner
- Department of Psychology, University of Maryland, College Park, MD, USA
| | - Melanie Bennett
- Department of Psychiatry, University of Maryland, Baltimore, MD, USA
| | - Julia W Felton
- Center for Health Policy & Health Services Research, Henry Ford Health System, Detroit, MI, USA
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Anvari MS, Belus JM, Kleinman MB, Seitz-Brown CJ, Felton JW, Dean D, Ciya N, Magidson JF. How to incorporate lived experience into evidence-based interventions: assessing fidelity for peer-delivered substance use interventions in local and global resource-limited settings. Transl Issues Psychol Sci 2022; 8:153-163. [PMID: 37900977 PMCID: PMC10611440 DOI: 10.1037/tps0000305] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2023]
Abstract
Interventions led by peer recovery specialists (PRSs) have rapidly expanded in response to a global shortage of access to substance use treatment. However, there is a lack of guidance on how to incorporate PRSs' lived experience into the delivery of evidence-based interventions (EBIs). Moreover, few resources exist to assess fidelity that integrate both content fidelity, peer competence, and incorporation of lived experience (i.e., PRS role fidelity). This study aimed to: (1) describe a novel PRS fidelity monitoring approach to assess both content and PRS role fidelity; (2) compare independent rater and PRS-self-reported content fidelity; (3) examine associations between content and PRS role fidelity; and (4) assess whether the PRS role fidelity was associated with substance use at post-treatment. This study was conducted across two PRS-led behavioral intervention trials conducted in global resource-limited settings: Baltimore City, US, and Khayelitsha, South Africa. A significant difference was found between PRS- and independent rater content fidelity in both interventions, with PRSs reporting significantly higher content fidelity in both sites. PRS role and content fidelity were not significantly correlated, suggesting greater adherence to the PRS role is not associated with lower adherence to structured EBI content. PRS role fidelity was not significantly associated with substance use at post-treatment. This study provides an important step towards understanding how to assess PRS role fidelity in the context of EBIs for underserved individuals with SUD that also incorporates their lived experience.
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Affiliation(s)
| | | | | | - CJ Seitz-Brown
- Department of Psychology, University of Maryland, College Park
| | - Julia W. Felton
- Center for Health Policy & Health Services Research, Henry Ford Health Systems
| | - Dwayne Dean
- Department of Psychology, University of Maryland, College Park
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Delemos D, Dean D. 579: Use of transthoracic electroporation for airway epithelial cell gene delivery in mice. J Cyst Fibros 2021. [DOI: 10.1016/s1569-1993(21)02002-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Kleinman MB, Doran K, Felton JW, Satinsky EN, Dean D, Bradley V, Magidson JF. Implementing a peer recovery coach model to reach low-income, minority individuals not engaged in substance use treatment. Subst Abus 2020; 42:726-734. [PMID: 33270540 DOI: 10.1080/08897077.2020.1846663] [Citation(s) in RCA: 2] [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] [Indexed: 10/22/2022]
Abstract
Background: Low-income, racial/ethnic minority individuals face significant barriers in access to substance use (SU) treatment. Peer recovery coaches (PRCs), individuals with lived experience with substance use disorder (SUD), may be uniquely well suited to assist those encountering barriers to treatment. PRCs can also help reach those not engaged in treatment to promote harm reduction and support linkage-to-care when embedded in community rather than clinical settings. This study evaluated a community-based program in which a PRC facilitated linkage to and supported retention in SU treatment. Methods: Guided by the RE-AIM framework, we evaluated implementation of the intervention in a community resource center (CRC) serving homeless and low-income residents of Baltimore City. We examined the reach, effectiveness, adoption, and implementation of this PRC model. Results: Of 199 clients approached by or referred to the PRC, 39 were interested in addressing their SU. Of those interested in addressing SU, the PRC linked 64.1% (n = 25) to treatment and was able to follow up with 59.0% (n = 23) at prespecified time points after linkage (24-48 hours, 2 weeks, and 1 month). Fifty-two percent (n = 13) of clients linked to SU treatment remained in treatment at 30 days post-linkage. Of clients who did not remain in treatment, 77% (n = 10) continued contact with the PRC. Conclusions: Results indicate the utility of the CRC's approach in linking people to treatment for SU and addressing barriers to care through work with a PRC. Findings also highlight important barriers and facilitators to implementation of this model, including the need for adaptation based on individual goals and fluctuations in readiness for treatment.
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Affiliation(s)
- Mary B Kleinman
- Department of Psychology, University of Maryland, College Park, MD, USA
| | - Kelly Doran
- Family and Community Health, University of Maryland School of Nursing, Baltimore, MD, USA
| | - Julia W Felton
- Department of Public Health, Michigan State University, Flint, MI, USA
| | - Emily N Satinsky
- Department of Psychology, University of Maryland, College Park, MD, USA
| | - Dwayne Dean
- Family and Community Health, University of Maryland School of Nursing, Baltimore, MD, USA
| | - Valerie Bradley
- Department of Psychology, University of Maryland, College Park, MD, USA
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Satinsky EN, Doran K, Felton JW, Kleinman M, Dean D, Magidson JF. Adapting a peer recovery coach-delivered behavioral activation intervention for problematic substance use in a medically underserved community in Baltimore City. PLoS One 2020; 15:e0228084. [PMID: 32004328 PMCID: PMC6993963 DOI: 10.1371/journal.pone.0228084] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [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: 06/13/2019] [Accepted: 01/07/2020] [Indexed: 01/01/2023] Open
Abstract
Low-income, racial/ethnic minority groups have disproportionately high rates of problematic substance use yet face barriers in accessing evidence-based interventions (EBIs). Peer recovery coaches (PRCs), individuals with lived experience with problematic substance use, may provide an effective approach to reaching these individuals. Traditionally PRCs have focused on bridging to other types of care rather than delivering EBIs themselves. The aim of this study was to assess perceptions of the appropriateness of a PRC-delivered adapted behavioral activation (BA) intervention to reduce problematic substance use for individuals not engaged in care. This study was conducted at a community resource center in Baltimore, Maryland serving low-income and homeless clients who have high rates of problematic substance use yet also face barriers to accessing care. Guided by the ADAPT-ITT framework, we conducted semi-structured key informant interviews with clients (n = 30) with past or present problematic substance use, and a focus group with community providers, including staff at the community resource center (n = 5) and PRCs (n = 6) from the community. Thirty percent (n = 9) of clients interviewed reported past problematic substance use and 70% (n = 21) met criteria for current use, most commonly cocaine and opioids. Clients, center staff, and PRCs shared that PRC-delivered BA could be acceptable and appropriate with suggested adaptations, including adding peer-delivered case-management and linkage to care alongside BA, and tailoring BA to include activities that are accessible and feasible in the community. These findings will inform the adaptation of PRC-delivered BA to address problematic substance use in this setting.
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Affiliation(s)
- Emily N. Satinsky
- Department of Psychology, University of Maryland, College Park, Maryland, United States of America
| | - Kelly Doran
- Department of Nursing, University of Maryland, Baltimore, Maryland, United States of America
| | - Julia W. Felton
- Department of Public Health, Michigan State University, Flint, Michigan, United States of America
| | - Mary Kleinman
- Department of Psychology, University of Maryland, College Park, Maryland, United States of America
| | - Dwayne Dean
- Department of Nursing, University of Maryland, Baltimore, Maryland, United States of America
| | - Jessica F. Magidson
- Department of Psychology, University of Maryland, College Park, Maryland, United States of America
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Ashenfelter J, Balantekin AB, Band HR, Bass CD, Bergeron DE, Berish D, Bowden NS, Brodsky JP, Bryan CD, Cherwinka JJ, Classen T, Conant AJ, Cox AA, Davee D, Dean D, Deichert G, Diwan MV, Dolinski MJ, Erickson A, Febbraro M, Foust BT, Gaison JK, Galindo-Uribarri A, Gilbert CE, Gilje KE, Hackett BT, Hans S, Hansell AB, Heeger KM, Insler J, Jaffe DE, Ji X, Jones DC, Kyzylova O, Lane CE, Langford TJ, LaRosa J, Littlejohn BR, Lu X, Martinez Caicedo DA, Matta JT, McKeown RD, Mendenhall MP, Minock JM, Mueller PE, Mumm HP, Napolitano J, Neilson R, Nikkel JA, Norcini D, Nour S, Pushin DA, Qian X, Romero-Romero E, Rosero R, Sarenac D, Surukuchi PT, Telles AB, Tyra MA, Varner RL, Viren B, White C, Wilhelmi J, Wise T, Yeh M, Yen YR, Zhang A, Zhang C, Zhang X. Measurement of the Antineutrino Spectrum from ^{235}U Fission at HFIR with PROSPECT. Phys Rev Lett 2019; 122:251801. [PMID: 31347897 DOI: 10.1103/physrevlett.122.251801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 03/22/2019] [Indexed: 06/10/2023]
Abstract
This Letter reports the first measurement of the ^{235}U ν[over ¯]_{e} energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9 m from the 85 MW_{th} highly enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based, segmented detector, PROSPECT has observed 31678±304(stat) ν[over ¯]_{e}-induced inverse beta decays, the largest sample from HEU fission to date, 99% of which are attributed to ^{235}U. Despite broad agreement, comparison of the Huber ^{235}U model to the measured spectrum produces a χ^{2}/ndf=51.4/31, driven primarily by deviations in two localized energy regions. The measured ^{235}U spectrum shape is consistent with a deviation relative to prediction equal in size to that observed at low-enriched uranium power reactors in the ν[over ¯]_{e} energy region of 5-7 MeV.
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Affiliation(s)
- J Ashenfelter
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - A B Balantekin
- Department of Physics, University of Wisconsin, Madison, Madison, Wisconsin 53706, USA
| | - H R Band
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - C D Bass
- Department of Physics, Le Moyne College, Syracuse, New York 13214, USA
| | - D E Bergeron
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - D Berish
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - N S Bowden
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J P Brodsky
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C D Bryan
- High Flux Isotope Reactor, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J J Cherwinka
- Physical Sciences Laboratory, University of Wisconsin, Madison, Madison, Wisconsin 53706, USA
| | - T Classen
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A J Conant
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - A A Cox
- Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - D Davee
- Department of Physics, College of William and Mary, Williamsburg, Virginia 23187, USA
| | - D Dean
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - G Deichert
- High Flux Isotope Reactor, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M V Diwan
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - M J Dolinski
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - A Erickson
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - M Febbraro
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - B T Foust
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - J K Gaison
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - A Galindo-Uribarri
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916, USA
| | - C E Gilbert
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916, USA
| | - K E Gilje
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - B T Hackett
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916, USA
| | - S Hans
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - A B Hansell
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - K M Heeger
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - J Insler
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - D E Jaffe
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - X Ji
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - D C Jones
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - O Kyzylova
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - C E Lane
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - T J Langford
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - J LaRosa
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - B R Littlejohn
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - X Lu
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916, USA
| | - D A Martinez Caicedo
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - J T Matta
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R D McKeown
- Department of Physics, College of William and Mary, Williamsburg, Virginia 23187, USA
| | - M P Mendenhall
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J M Minock
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - P E Mueller
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - H P Mumm
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - J Napolitano
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - R Neilson
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - J A Nikkel
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - D Norcini
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - S Nour
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - D A Pushin
- Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - X Qian
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - E Romero-Romero
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916, USA
| | - R Rosero
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - D Sarenac
- Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - P T Surukuchi
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - A B Telles
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - M A Tyra
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - R L Varner
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - B Viren
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - C White
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - J Wilhelmi
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - T Wise
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - M Yeh
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Y-R Yen
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - A Zhang
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - C Zhang
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - X Zhang
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
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11
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Ashenfelter J, Balantekin AB, Baldenegro C, Band HR, Bass CD, Bergeron DE, Berish D, Bignell LJ, Bowden NS, Bricco J, Brodsky JP, Bryan CD, Bykadorova Telles A, Cherwinka JJ, Classen T, Commeford K, Conant AJ, Cox AA, Davee D, Dean D, Deichert G, Diwan MV, Dolinski MJ, Erickson A, Febbraro M, Foust BT, Gaison JK, Galindo-Uribarri A, Gilbert CE, Gilje KE, Glenn A, Goddard BW, Hackett BT, Han K, Hans S, Hansell AB, Heeger KM, Heffron B, Insler J, Jaffe DE, Ji X, Jones DC, Koehler K, Kyzylova O, Lane CE, Langford TJ, LaRosa J, Littlejohn BR, Lopez F, Lu X, Martinez Caicedo DA, Matta JT, McKeown RD, Mendenhall MP, Miller HJ, Minock JM, Mueller PE, Mumm HP, Napolitano J, Neilson R, Nikkel JA, Norcini D, Nour S, Pushin DA, Qian X, Romero-Romero E, Rosero R, Sarenac D, Seilhan BS, Sharma R, Surukuchi PT, Trinh C, Tyra MA, Varner RL, Viren B, Wagner JM, Wang W, White B, White C, Wilhelmi J, Wise T, Yao H, Yeh M, Yen YR, Zhang A, Zhang C, Zhang X, Zhao M. First Search for Short-Baseline Neutrino Oscillations at HFIR with PROSPECT. Phys Rev Lett 2018; 121:251802. [PMID: 30608854 DOI: 10.1103/physrevlett.121.251802] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Indexed: 06/09/2023]
Abstract
This Letter reports the first scientific results from the observation of antineutrinos emitted by fission products of ^{235}U at the High Flux Isotope Reactor. PROSPECT, the Precision Reactor Oscillation and Spectrum Experiment, consists of a segmented 4 ton ^{6}Li-doped liquid scintillator detector covering a baseline range of 7-9 m from the reactor and operating under less than 1 m water equivalent overburden. Data collected during 33 live days of reactor operation at a nominal power of 85 MW yield a detection of 25 461±283 (stat) inverse beta decays. Observation of reactor antineutrinos can be achieved in PROSPECT at 5σ statistical significance within 2 h of on-surface reactor-on data taking. A reactor model independent analysis of the inverse beta decay prompt energy spectrum as a function of baseline constrains significant portions of the previously allowed sterile neutrino oscillation parameter space at 95% confidence level and disfavors the best fit of the reactor antineutrino anomaly at 2.2σ confidence level.
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Affiliation(s)
- J Ashenfelter
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - A B Balantekin
- Department of Physics, University of Wisconsin, Madison, Madison, Wisconsin 53706, USA
| | - C Baldenegro
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - H R Band
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - C D Bass
- Department of Physics, Le Moyne College, Syracuse, New York 13214, USA
| | - D E Bergeron
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - D Berish
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - L J Bignell
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - N S Bowden
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J Bricco
- Physical Sciences Laboratory, University of Wisconsin, Madison, Madison, Wisconsin 53706, USA
| | - J P Brodsky
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C D Bryan
- High Flux Isotope Reactor, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - A Bykadorova Telles
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - J J Cherwinka
- Physical Sciences Laboratory, University of Wisconsin, Madison, Madison, Wisconsin 53706, USA
| | - T Classen
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K Commeford
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - A J Conant
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - A A Cox
- Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - D Davee
- Department of Physics, College of William and Mary, Williamsburg, Virginia 23185, USA
| | - D Dean
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - G Deichert
- High Flux Isotope Reactor, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - M V Diwan
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - M J Dolinski
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - A Erickson
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - M Febbraro
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - B T Foust
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - J K Gaison
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - A Galindo-Uribarri
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C E Gilbert
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - K E Gilje
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - A Glenn
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B W Goddard
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - B T Hackett
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - K Han
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - S Hans
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - A B Hansell
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - K M Heeger
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - B Heffron
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - J Insler
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - D E Jaffe
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - X Ji
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - D C Jones
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - K Koehler
- Physical Sciences Laboratory, University of Wisconsin, Madison, Madison, Wisconsin 53706, USA
| | - O Kyzylova
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - C E Lane
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - T J Langford
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - J LaRosa
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - B R Littlejohn
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - F Lopez
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - X Lu
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D A Martinez Caicedo
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - J T Matta
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - R D McKeown
- Department of Physics, College of William and Mary, Williamsburg, Virginia 23185, USA
| | - M P Mendenhall
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H J Miller
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - J M Minock
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - P E Mueller
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - H P Mumm
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - J Napolitano
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - R Neilson
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - J A Nikkel
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - D Norcini
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - S Nour
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - D A Pushin
- Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - X Qian
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - E Romero-Romero
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - R Rosero
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - D Sarenac
- Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - B S Seilhan
- Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Sharma
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - P T Surukuchi
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - C Trinh
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - M A Tyra
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - R L Varner
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - B Viren
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - J M Wagner
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - W Wang
- Department of Physics, College of William and Mary, Williamsburg, Virginia 23185, USA
| | - B White
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - C White
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - J Wilhelmi
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, USA
| | - T Wise
- Wright Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520, USA
| | - H Yao
- Department of Physics, College of William and Mary, Williamsburg, Virginia 23185, USA
| | - M Yeh
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Y-R Yen
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - A Zhang
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - C Zhang
- Brookhaven National Laboratory, Upton, New York 11973, USA
| | - X Zhang
- Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA
| | - M Zhao
- Brookhaven National Laboratory, Upton, New York 11973, USA
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Cameron B, Traver G, Freeman M, Wang J, Sekhar K, Johnson L, Dean D, Fahhoum M. Intrinsic Resistance of V-SVZ Neural Stem Cells Subjected to Concurrent Daily Radiation and Temozolomide Therapy. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.601] [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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Yehya A, Rajagopal V, Meduri C, Kauten J, Brown M, Dean L, Webster J, Krishnamoorthy A, Hrobowski T, Dean D. TAVR is an Effective and Durable Treatment Modality for Symptomatic Aortic Insufficiency in LVAD Patients. J Heart Lung Transplant 2018. [DOI: 10.1016/j.healun.2018.01.171] [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: 11/30/2022] Open
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Schoch S, Riedner B, Dean D, O'Muircheartaigh J, Deoni S, Huber R, Jenni O, LeBourgeois M, Kurth S. EEG signatures of brain maturation in children: age-related and across-night dynamics in spatial propagation of slow oscillations. Sleep Med 2017. [DOI: 10.1016/j.sleep.2017.11.509] [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] [Indexed: 11/17/2022]
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Choopara I, Arunrut N, Kiatpathomchai W, Dean D, Somboonna N. Corrigendum: Rapid and visual Chlamydia trachomatis detection using loop-mediated isothermal amplification and hydroxynaphthol blue. Lett Appl Microbiol 2017; 65:343. [PMID: 28913832 DOI: 10.1111/lam.12786] [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: 11/28/2022]
Affiliation(s)
- I Choopara
- Program in Biotechnology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - N Arunrut
- Bioengineering and Sensing Technology Laboratory, National Center for Genetic Engineering and Biotechnology, Khlong Nueng, Khlong Luang, Pathum Thani, Thailand
| | - W Kiatpathomchai
- Bioengineering and Sensing Technology Laboratory, National Center for Genetic Engineering and Biotechnology, Khlong Nueng, Khlong Luang, Pathum Thani, Thailand
| | - D Dean
- Center for Immunobiology and Vaccine Development, UCSF Benioff Children's Hospital Oakland Research Institute, Oakland, CA, USA.,Department of Medicine, University of California, San Francisco, CA, USA.,Joint Graduate Program in Bioengineering, University of California, Berkeley, CA, USA
| | - N Somboonna
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
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Choopara I, Arunrut N, Kiatpathomchai W, Dean D, Somboonna N. Rapid and visual Chlamydia trachomatis detection using loop-mediated isothermal amplification and hydroxynaphthol blue. Lett Appl Microbiol 2016; 64:51-56. [PMID: 27689353 DOI: 10.1111/lam.12675] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Revised: 08/17/2016] [Accepted: 09/26/2016] [Indexed: 12/01/2022]
Abstract
We developed an assay comprising crude DNA lysis by simple heat treatment coupled loop-mediated isothermal amplification with hydroxynaphthol blue for Chlamydia trachomatis detection (petty patent pending), and evaluated the developed assay for its feasibility as a one-step point-of-care detection on 284 endocervical swab specimens from clinically symptomatic C. trachomatis and healthy subjects. This assay is sensitive to 0·04 pg of ompA, specific with six primers targeting C. trachomatis ompA region, rapid (45 min total assay time), inexpensive (approx. 3 USD/reaction), does not require sophisticated instrumentation, and has comparable assay effectiveness (95% specificity, 90-100% sensitivity) to bacterial DNA isolation by a commercial kit coupled with polymerase chain reaction and gel electrophoresis (98-100% specificity, 87-100% sensitivity) based on the clinical samples test. The test result could be read by naked eye through the colour change from violet (negative) to sky blue (positive) for C. trachomatis-infected specimens. Further, this assay uses all safe chemical reagents and is hence safe to the users. SIGNIFICANCE AND IMPACT OF THE STUDY Chlamydia trachomatis is the major bacterial sexually transmitted disease worldwide. The clinical symptoms are broad, and chronic C. trachomatis infections could lead to blindness, ectopic pregnancy, sterility in males and females, and a higher risk of the development of cervical cancer. The result indicates the potential usefulness of our crude DNA lysis coupled loop-mediated isothermal amplification with hydroxynaphthol blue for a simple, rapid, specific, sensitive and cost-effective assay for C. trachomatis detection from suspected specimens. This assay offers an alternative in the clinical diagnosis of C. trachomatis in resource-limited health-care facilities and clinical laboratories in developing countries, and in field tests.
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Affiliation(s)
- I Choopara
- Program in Biotechnology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - N Arunrut
- Bioengineering and Sensing Technology Laboratory, National Center for Genetic Engineering and Biotechnology, Khlong Nueng, Khlong Luang, Pathum Thani, Thailand
| | - W Kiatpathomchai
- Bioengineering and Sensing Technology Laboratory, National Center for Genetic Engineering and Biotechnology, Khlong Nueng, Khlong Luang, Pathum Thani, Thailand
| | - D Dean
- Center for Immunobiology and Vaccine Development, UCSF Benioff Children's Hospital Oakland Research Institute, Oakland, CA, USA.,Department of Medicine, University of California, San Francisco, CA, USA.,Joint Graduate Program in Bioengineering, University of California, Berkeley, CA, USA
| | - N Somboonna
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand.,Omics Sciences and Bioinformatics Center, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
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Dean D, Abdalla MA, Vaidya U, Ganguli R, Battle CJ, Abdalla M, Haque A, Campbell S. Processable PMR-Type Polyimides: Process-Property Relationships, Curing Kinetics, and Thermooxidative Stability. HIGH PERFORM POLYM 2016. [DOI: 10.1177/0954008305045576] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The rheological and structural characteristics of polyimides with enhanced melt flow have been investigated. The polyimides were based on 2,3,3′,4′-biphenyltertracarboxylic dianhydride (PBDA) and a mixture of a diamine, 4,4′ (1,4-phenylene-bismethylene) bisaniline (BAX) and a triamine, 1,3,5-Tris (4-aminophenoxybenzene), TAB, where the amount of TAB was 4 and 8%. Melt viscosities of these polymers suggest that they are processable by resin infusion methods. Although curing occurs through the phenylethynyl endcap, the steric and electronic differences of the three amines results in different cure kinetics and heterogeneous crosslinking. This is manifested in multiple Tg values in the differential scanning calorimetry (DSC) scan of the cured samples. Rheological and DSC kinetic studies of the cure behavior indicate that the sample with 4% TAB cures more quickly than the system with 8% TAB and it has a lower activation energy (147 versus 185 kJ mole-1). Thermal gravimetric analysis (TGA) scans indicate that both TAB based samples are more thermally stable than PMR-15. The lower activation energy for 8% TAB, relative to 4% TAB (147.0 versus 170.2 kJ mole-1) suggests the additional branching present decreases the thermal stability.
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Affiliation(s)
- D. Dean
- Department of Materials Science and Engineering, University of Alabama-Birmingham,
| | - M. A. Abdalla
- Department of Materials Science and Engineering, University of Alabama-Birmingham
| | - U. Vaidya
- Department of Materials Science and Engineering, University of Alabama-Birmingham
| | - R. Ganguli
- Center for Advanced Materials, Tuskegee University
| | - C. J. Battle
- Center for Advanced Materials, Tuskegee University
| | - M. Abdalla
- Center for Advanced Materials, Tuskegee University
| | - A. Haque
- Department of Aerospace and Mechanics, University of Alabama
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Kim J, Craig D, Dean D, Schessler B, Grider S, Brickman K. 123 Video-Assisted Endotracheal Intubation via Direct Laryngoscopy Using Google Glass: A Pilot Study. Ann Emerg Med 2015. [DOI: 10.1016/j.annemergmed.2015.07.155] [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: 10/23/2022]
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Miele A, Pan J, Walker L, Doernberg E, Waskiewicz N, Dean D, Dirks H, Harrison-Goldman T, D'Sa V, Deoni S. B-75 * Neural Correlates of Emerging Executive Functioning in 2-5 Year Olds. Arch Clin Neuropsychol 2014. [DOI: 10.1093/arclin/acu038.163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Miele A, Pan J, Walker L, Waskiewicz N, Doernberg E, Dean D, Dirks H, Harrison-Goldman T, D'Sa V, Deoni S. B-74 * The Relationship of Myelin Content and Measures of Executive Functioning in Typically Developing Children. Arch Clin Neuropsychol 2014. [DOI: 10.1093/arclin/acu038.162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Dean D, Ewald G, Tatooles A, Sheridan B, Brewer R, Caldeira C, Kallel F, Farrar D, Akhter S. Reduction in Driveline Infection Rates: Results from the HeartMate II Multicenter Silicone-Skin-Interface (SSI) Registry. J Heart Lung Transplant 2014. [DOI: 10.1016/j.healun.2014.01.056] [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: 10/25/2022] Open
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Klodell C, Massey H, Adamson R, Dean D, Horstmanshof D, Ransom J, Salerno C, Cowger J, Aranda J, Chen L, Long J, Sundareswaran K, Farrar D, Dembitsky W. Factors Related to Pump Thrombosis at Select Medium to High Volume Centers. J Heart Lung Transplant 2014. [DOI: 10.1016/j.healun.2014.01.351] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Dean D. Chlamydia trachomatis today: treatment, detection, immunogenetics and the need for a greater global understanding of chlamydial disease pathogenesis. Drugs Today (Barc) 2009; 45 Suppl B:25-31. [PMID: 20011691 PMCID: PMC3278962] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Chlamydia trachomatis is an important human pathogen causing a myriad of severe and debilitating diseases. While antibiotics have been a mainstay of treatment, there is increasing evidence for potential drug resistance, reinfection and persistent infections that require a reevaluation of treatment strategies. A critical need to address these issues will be a rapid, sensitive and cost-effective diagnostic that can be used for global screening, treatment and test-of-cure of infected individuals instead of empirical therapy that not only drives drug resistance but is not costeffective. This type of diagnostic would allow clinicians and researchers to evaluate the true incidence and prevalence of chlamydial infections in both developed and developing countries. There are extremely limited data on chlamydial sexually transmitted diseases (STDs) in many developing countries, including those in Central and South America. In addition, advancing our understanding of chlamydial disease pathogenesis will require an evaluation of host genetic susceptibility to infection and sequelae. We provide preliminary data on rates of chlamydial STDs and host genetic factors that predispose to infection among adolescent pregnant and nonpregnant commercial sex worker populations residing in Quito, Ecuador.
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Affiliation(s)
- D Dean
- Children's Global Health Initiative, University of California at San Francisco, San Francisco, USA.
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Treas J, Dean D, Jones A. SU-FF-T-28: Localizing Differences in 131Cs Intraoperative and Postoperative Prostate Seed Brachytherapy Plans. Med Phys 2009. [DOI: 10.1118/1.3181499] [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: 11/07/2022] Open
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Hemmer JD, Dean D, Vertegel A, Langan E, LaBerge M. Effects of serum deprivation on the mechanical properties of adherent vascular smooth muscle cells. Proc Inst Mech Eng H 2008; 222:761-72. [DOI: 10.1243/09544119jeim371] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Vascular smooth muscle cell (VSMC) function plays a key role in regulating the development and progression of vascular lesions. Among the more significant phenomena that occur during the development of these lesions is the phenotypic switching of VSMCs from a contractile to a synthetic state. A better understanding of the concurrent changes to VSMC mechanical properties that occur with phenotypic shifts can help to elucidate the role of VSMC mechanics in the development of vascular diseases. In the current study, the mechanical properties of adherent cultured rat aortic VSMCs were assessed by atomic force microscopy. Serum starvation was used to induce a phenotypic shift in vitro. It was concluded that serum starvation led to a statistically significant increase in apparent elastic modulus after 5 days, as well as a statistically significant decrease in hysteresis after culture for 3 days. If this trend of VSMC mechanical properties changing concurrently with phenotypic shifts were to hold true in vivo, such changes could affect the processes of mechanotransduction and/or arterial mechanical properties, thereby contributing to the progression of vascular disease.
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Affiliation(s)
- J D Hemmer
- Department of Bioengineering, Clemson University, Clemson, SC, USA
| | - D Dean
- Department of Bioengineering, Clemson University, Clemson, SC, USA
| | - A Vertegel
- Department of Bioengineering, Clemson University, Clemson, SC, USA
| | - E Langan
- Department of Bioengineering, Clemson University, Clemson, SC, USA
| | - M LaBerge
- Department of Bioengineering, Clemson University, Clemson, SC, USA
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Jasti K, Vido D, Paul C, Bhashyam S, Olson P, Bailey S, Dean D, Magovern G, Lasorda D, Murali S. 77: Does Gene Expression Profiling Scores Correlate with Cardiac Allograft Vasculopathy Assessed by Intravascular Ultrasonography? J Heart Lung Transplant 2008. [DOI: 10.1016/j.healun.2007.11.082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Abstract
BACKGROUND Linear IgA disease (LAD) is an acquired subepidermal blistering disorder, characterized clinically by urticated plaques, papules, vesicles and bullae. Scarring is not usually observed. Direct immunofluorescence on clinically uninvolved skin shows linear deposition of IgA at the basement membrane zone (BMZ). Indirect immunofluorescence on salt-split skin shows dermal binding in a minority of cases. AIM To identify and characterize patients with LAD who have IgA anti-BMZ autoantibodies directed against the dermal side of salt-split human skin (dermal-binding autoantibodies). METHODS This was a retrospective study of patients with a diagnosis of LAD referred to the dermatology department in Oxford between 1986 and 2004, who demonstrated dermal-binding circulating IgA autoantibodies on indirect immunofluorescence. Clinical features were reviewed and target antigens identified by immunoblotting. RESULTS In total, 17 of 101 patients with LAD were found to have dermal-binding autoantibodies. This subset of LAD was relatively more common in adults than in children. There were no other clinical features that distinguished these patients from others with LAD. Collagen VII, the target antigen in epidermolysis bullosa acquisita (EBA), was identified in two of our cohort, but none of the classic clinical features of mechanobullous EBA was observed. CONCLUSION This is the largest cohort of patients with dermal-binding LAD to date. Our patients were clinically indistinguishable from those with non dermal-binding LAD, and showed no evidence of the classic mechanobullous EBA phenotype.
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Affiliation(s)
- A Lally
- Department of Dermatology, Oxford Radcliffe Hospitals, Oxford, UK.
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Abstract
This study proposes and simulates an inverse treatment planning and a continuous dose delivery approach for the Leksell Gamma Knife (LGK, Elekta, Stockholm, Sweden) which we refer to as "Tomosurgery." Tomosurgery uses an isocenter that moves within the irradiation field to continuously deliver the prescribed radiation dose in a raster-scanning format, slice by slice, within an intracranial lesion. Our Tomosurgery automated (inverse) treatment planning algorithm utilizes a two-stage optimization strategy. The first stage reduces the current three-dimensional (3D) treatment planning problem to a series of more easily solved 2D treatment planning subproblems. In the second stage, those 2D treatment plans are assembled to obtain a final 3D treatment plan for the entire lesion. We created Tomosurgery treatment plans for 11 patients who had already received manually-generated LGK treatment plans to treat brain tumors. For the seven cases without critical structures (CS), the Tomosurgery treatment plans showed borderline to significant improvement in within-tumor dose standard deviation (STD) (p <0.058, or p <0.011 excluding case 2) and conformality (p < 0.042), respectively. In three of the four cases that presented CS, the Tomosurgery treatment plans showed no statistically significant improvements in dose conformality (p <0.184), and borderline significance in improving within-tumor dose homogeneity (p <0.054); CS damage measured by V20 or V30 (i.e., irradiated CS volume that receives > or =20% or > or =30% of the maximum dose) showed no significant improvement in the Tomosurgery treatment plans (p<0.345 and p <0.423, respectively). However, the overall CS dose volume histograms were improved in the Tomosurgery treatment plans. In addition, the LGK Tomosurgery inverse treatment planning required less time than standard of care, forward (manual) LGK treatment planning (i.e., 5-35 min vs 1-3 h) for all 11 cases. We expect that LGK Tomosurgery will speed treatment planning and improve treatment quality, especially for large and/or geometrically complex lesions. However, using only 4 mm collimators could greatly increase treatment plan delivery time for a large brain lesion. This issue is subject to further investigation.
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Affiliation(s)
- X Hu
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA
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Brambati S, Rankin K, Narvid J, Seeley W, Dean D, Rosen H, Miller B, Ashburner J, Gorno-Tempini M. Atrophy progression in semantic dementia with asymmetric temporal involvement: a tensor-based morphometry study. Neurobiol Aging 2007; 30:103-11. [PMID: 17604879 PMCID: PMC2643844 DOI: 10.1016/j.neurobiolaging.2007.05.014] [Citation(s) in RCA: 158] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2007] [Revised: 04/18/2007] [Accepted: 05/17/2007] [Indexed: 11/28/2022]
Abstract
We performed a longitudinal anatomical study to map the progression of gray matter atrophy in anatomically defined predominantly left (LTLV) and right (RTLV) temporal lobe variants of semantic dementia (SD). T1-weighted MRI scans were obtained at presentation and one-year follow-up from 13 LTLV, 6 RTLV, and 25 control subjects. Tensor-based morphometry (TBM) in SPM2 was applied to derive a voxel-wise estimation of regional tissue loss over time from the deformation field required to warp the follow-up scan to the presentation scan in each subject. When compared to controls, both LTLV and RTLV showed significant progression of gray matter atrophy not only within the temporal lobe most affected at presentation, but also in the controlateral temporal regions (p<0.05 FWE corrected). In LTLV, significant progression of volume loss also involved the ventromedial frontal and the left anterior insular regions. These results identified the anatomic substrates of the previously reported clinical evolution of LTLV and RTLV into a unique 'merged' clinical syndrome characterized by semantic and behavioral deficits and bilateral temporal atrophy.
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Affiliation(s)
- S.M. Brambati
- Memory Aging Center, UCSF Department of Neurology, San Francisco, CA, United States
- Università Vita-Salute San Raffaele, Milano, Italy
| | - K.P. Rankin
- Memory Aging Center, UCSF Department of Neurology, San Francisco, CA, United States
| | - J. Narvid
- Memory Aging Center, UCSF Department of Neurology, San Francisco, CA, United States
| | - W.W. Seeley
- Memory Aging Center, UCSF Department of Neurology, San Francisco, CA, United States
| | - D. Dean
- Memory Aging Center, UCSF Department of Neurology, San Francisco, CA, United States
| | - H.J. Rosen
- Memory Aging Center, UCSF Department of Neurology, San Francisco, CA, United States
| | - B.L. Miller
- Memory Aging Center, UCSF Department of Neurology, San Francisco, CA, United States
| | - J. Ashburner
- Wellcome Department of Imaging Neuroscience, Functional Imaging Laboratory, London, UK
| | - M.L. Gorno-Tempini
- Memory Aging Center, UCSF Department of Neurology, San Francisco, CA, United States
- Corresponding author at: UCSF Memory and Aging Center, 350 Parnassus Avenue, Suite 506, San Francisco, CA 94143, United States. Tel.: +1 415 476 1895; fax: +1 415 476 0213. E-mail address: (M.L. Gorno-Tempini)
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Abstract
BACKGROUND Although the histology of lichen sclerosus is characteristic, the precise nature of the inflammatory changes and the signals provoking them is uncertain. OBJECTIVES To delineate the inflammatory changes in lichen sclerosus more accurately by studying cytokine changes. METHODS An immunohistochemical study of 12 specimens of genital lichen sclerosus and one specimen of extragenital lichen sclerosus was undertaken using monoclonal antibodies to interferon (IFN)-gamma, IFN-gamma receptor, tumour necrosis factor (TNF)-alpha, interleukin (IL)-1alpha, IL-2 receptor (CD25), intercellular adhesion molecule-1 (ICAM-1) and its ligand CD11a. Control specimens were seven specimens of normal vulva obtained during gynaecological procedures, three specimens of normal skin, adjacent uninvolved thigh from three of the patients with lichen sclerosus, five specimens of nonvulval psoriasis, four specimens of nonvulval lichen planus and two specimens from chronic wounds. RESULTS The lichen sclerosus specimens demonstrated slightly increased staining for IFN-gamma within the epidermis compared with the normal vulva and nonvulval skin. There was increased dermal staining for IFN-gamma both within the pale zone of the upper dermis and within the inflammatory zone below this. We confirmed our previous demonstration that in lichen sclerosus HLA-DR immunostaining is increased in association with vascular endothelium, the inflammatory cell infiltrate and around the keratinocytes. The areas of the epidermis with the strongest immunostaining for HLA-DR generally also had the strongest staining for IFN-gamma. In the lichen sclerosus specimens the zone of inflammation also demonstrated increased immunostaining for TNF-alpha, IL-1alpha, IFN-gamma receptor, CD25, CD11a and ICAM-1 while the zone of sclerosus demonstrated a smaller increase in immunostaining for IFN-gamma receptor, TNF-alpha, CD11a and ICAM-1, and the epidermis demonstrated increased staining for ICAM-1. CONCLUSIONS The increased staining for IFN-gamma, TNF-alpha, IL-1alpha, IFN-gamma receptor, CD25, CD11a and ICAM-1 suggest that the cytokine response in lichen sclerosus shares characteristics of the cytokine response in lichen planus and chronic wounds.
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Affiliation(s)
- A M Farrell
- Department of Dermatology, Oxford Radcliffe Hospitals, Oxford, UK.
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Abstract
BACKGROUND Recently, a significant association between Chlamydia trachomatis infection and postoperative trachomatous trichiasis (TT) recurrence was shown. The current study evaluated whether azithromycin treatment at the time of surgery could reduce recurrence. METHODS As part of Nepal's national trachoma control programme, patients received azithromycin (53 patients) or placebo (56 patients) at surgery. Conjunctivae were graded for trachoma and swabbed to detect chlamydiae preoperatively and postoperatively up to 12 months. Logistic regression was performed for associations of treatment option with recurrence, infection, and active trachoma (by eye and by patient). RESULTS TT recurrence was 28.9% at 12 months. Recurrence was significantly lower for those with major TT at baseline in the azithromycin group at 12 months (p = 0.03); incident recurrence was also significantly lower at 6 months (OR, 0.056; 95% CI, 0 to 0.423; p = 0.004). There was a trend for increased recurrence among those with minor TT at baseline and for reduction of active trachoma and infection in the azithromycin group but not the placebo group. CONCLUSION These data suggest that azithromycin treatment at the time of surgery may be warranted for patients with major TT. However, treatment should be investigated further for minor TT, for efficacy at subsequent time intervals and in other trachoma endemic settings.
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Affiliation(s)
- H Zhang
- University of California School of Medicine, Children,s Hospital Oakland Research Institute, Oakland, CA 94609, USA
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Sander CS, Cooper SM, Ali I, Dean D, Thiele JJ, Wojnarowska F. Decreased antioxidant enzyme expression and increased oxidative damage in erosive lichen planus of the vulva. BJOG 2005; 112:1572-5. [PMID: 16225582 DOI: 10.1111/j.1471-0528.2005.00743.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The aim of this study was to investigate whether increased oxidative stress occurs in erosive lichen planus of the vulva. Skin biopsies from six patients with untreated, histologically confirmed erosive lichen planus of the vulva were examined immunohistochemically using antibodies against antioxidant enzymes. The protein-bound lipid peroxidation products malondialdehyde (MDA) and 4-hydroxynonenale (4-HNE) and the oxidative DNA damage marker 8-hydroxy-2'-deoxyguanosine (8-OHdG) were investigated. Protein carbonyls as markers of protein oxidation were visualised using the dinitrophenylhydrazone (DNPH) method. Normal vulval tissues from 12 subjects served as controls. In vulval lichen planus tissue the enzymatic antioxidant defence was found to be significantly decreased in the epidermal layers. Furthermore, a significant increase of lipid peroxidation products and oxidative DNA damage was found within the epidermis. Protein oxidation occurred predominantly in the papillary dermis. This is the first study to demonstrate a decreased antioxidant defence and increased oxidative damage to lipids, DNA and proteins in lichen planus. These oxidative modifications point to pathophysiological alterations mainly within the basal cell layers of the epidermis and at the dermoepidermal junction. Further studies are warranted to investigate the potential role of oxidative stress in the development of autoimmunity in this disease.
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Affiliation(s)
- C S Sander
- Dermatology Department, The Churchill Hospital, Oxford, UK
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Cooper SM, Dean D, Allen J, Kirtschig G, Wojnarowska F. Erosive lichen planus of the vulva: weak circulating basement membrane zone antibodies are present. Clin Exp Dermatol 2005; 30:551-6. [PMID: 16045691 DOI: 10.1111/j.1365-2230.2005.01866.x] [Citation(s) in RCA: 30] [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: 11/28/2022]
Abstract
The objective of this study was to investigate whether circulating basement membrane zone (BMZ) antibodies are present in erosive lichen planus (LP) of the vulva. In total, 56 consecutive women with biopsy-confirmed erosive LP of the vulva were recruited from a vulval clinic in a district general hospital and teaching hospital in Oxfordshire. Indirect immunofluorescence (IgG and IgA) was performed on 56 sera, and 15 were tested to IgG subclasses (1-4). Immunoblotting was carried out on salt-split and urea-extracted epidermal skin extracts on 11. The main outcome measure was the presence or absence of staining at the BMZ. Of the 56 sera, 34 (61%) had weak (neat or 1 : 5) epidermal-binding BMZ antibodies (25 had IgG, 5 had IgA, 4 had both IgG and IgA). All 15 sera tested to IgG showed epidermal binding to one or more IgG subclasses: IgG1 (7 sera), IgG2 (7), IgG3 (7) and IgG4 (0). Immunoblotting identified IgG antibodies to bullous pemphigoid (BP)180 (10/11) and BP230 (2/11). The majority (61%) of patients with vulval erosive LP had circulating serum IgG BMZ antibodies, chiefly reacting with BP180. There was subclass restriction of the IgG response to IgG1, 2 and 3. The significance of these antibodies is uncertain, but they may be a marker for the disease.
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Affiliation(s)
- S M Cooper
- Department of Dermatology, Oxford Radcliffe Hospitals, Oxford, UK.
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Abstract
Pili annulati is a rare autosomal inherited hair shaft abnormality of unknown pathogenesis in which clinical examination reveals alternating light and dark bands leading to a shiny appearance of the hair due to cavities within the cortex of the hair shaft. This is the first investigation of the proposed cytokeratin defect in pili annulati hair follicles. Four cryopreserved pili annulati and four control scalp specimens were analysed using immunohistochemistry for different 'hard' trichocytic and 'soft' epithelial cytokeratins including K1, K6, K10, K14, K16, K17, K18, K19, Ha1 and Hb1. There was no difference in staining intensity and quality of staining pattern seen in pili annulati and control scalp specimens. These results suggest that pili annulati is not caused by a defect of the cytokeratins investigated in this study.
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Affiliation(s)
- K A Giehl
- Department of Dermatology, Ludwig-Maximilian-University, Munich, Germany
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Cooper SM, Prenter A, Allen J, Dean D, Wojnarowska F. The basement membrane zone and dermal extracellular matrix in erosive lichen planus of the vulva: an immunohistochemical study demonstrating altered expression of hemidesmosome components and anchoring fibrils. Clin Exp Dermatol 2005; 30:277-81. [PMID: 15807689 DOI: 10.1111/j.1365-2230.2005.01751.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [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: 11/30/2022]
Abstract
Histopathology demonstrates disruption of the basal layer of the epidermis in lichen planus (LP) and altered expression of basement membrane zone (BMZ) components occurs in cutaneous and oral LP. This is the first study in erosive LP of the vulva to investigate the expression of components of the BMZ and extracellular matrix by indirect immunofluorescence. Six biopsies from lesional vulval erosive LP were compared with two biopsies from normal vulva and five biopsies from normal skin. In erosive vulval LP there was widespread disruption of several BMZ components compared to normal skin. The hemidesmosome antigens were disrupted and attenuated, or absent. Expression of lamina lucida proteins and anchoring filaments also showed some alteration. Lamina densa components were altered and in particular there was very marked thickening, streaking and fragmentation of the anchoring fibrils. Some dermal extracellular matrix proteins were increased. This study has demonstrated widespread damage to the BMZ in erosive LP of the vulva, in particular the hemidesmosomes (alpha6beta4 integrin, BP230, BP180) and anchoring fibrils (collagen VII). This suggests an alteration in antigenic expression in the BMZ that may lead to exposure of epitopes and thus make these proteins vulnerable to attack by autoantibodies.
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Affiliation(s)
- S M Cooper
- Department of Dermatology, Oxford Radcliffe Hospitals, Oxford, OX7 2LJ, UK.
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Abstract
BACKGROUND Lichen sclerosus (LS) is a chronic inflammatory skin disease of unknown aetiology which can be associated with secondary malignancies. Recent evidence supports an autoimmune basis for this disorder, as demonstrated by autoantibodies to extracellular matrix protein 1 (ECM-1). The pathophysiological mechanisms leading to autoimmunity and carcinogenesis are poorly understood. OBJECTIVES We hypothesized that oxidative stress, which has been demonstrated to be involved in the pathogenesis of several autoimmune and malignant disorders, contributes to these processes in LS. METHODS Skin biopsies from 16 patients with untreated, histologically confirmed vulval LS were examined immunohistochemically using antibodies against the lipid peroxidation products malondialdehyde and 4-hydroxynonenale and against the oxidative DNA damage marker 8-hydroxy-2'-deoxyguanosine. Protein carbonyls as markers of protein oxidation were visualized using the dinitrophenylhydrazone method. Expression of antioxidant enzymes was investigated. Normal vulval tissue from 16 subjects served as control. RESULTS In vulval LS tissue a significant increase of lipid peroxidation products was found particularly within the basal cell layers of the epidermis, thus colocalizing with ECM-1. Oxidative DNA damage was detected throughout LS biopsies. Intriguingly, protein oxidation was significantly increased within the dermis of LS lesions, indicating oxidative protein damage in the areas of sclerosis and inflammation. The enzymatic antioxidant defence in LS was found to be significantly disturbed. CONCLUSIONS This is the first study to demonstrate oxidative damage to lipids, DNA and proteins in LS, revealing a novel pathophysiological mechanism which may contribute to sclerosis, autoimmunity and carcinogenesis. Therapeutic strategies using antioxidants might be a useful new approach in the treatment of LS and could also help to prevent secondary malignancies.
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Affiliation(s)
- C S Sander
- Dermatology Department, The Churchill Hospital, Old Road, Oxford OX3 7LJ, UK
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Giehl KA, Ferguson DJP, Dean D, Chuang YH, Allen J, Berker DARD, Tosti A, Dawber RPR, Wojnarowska F. Alterations in the basement membrane zone in pili annulati hair follicles as demonstrated by electron microscopy and immunohistochemistry. Br J Dermatol 2004; 150:722-7. [PMID: 15099369 DOI: 10.1111/j.0007-0963.2004.05837.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
BACKGROUND Pili annulati is a rare autosomal dominant inherited hair shaft abnormality in which clinical examination reveals alternating light and dark bands leading to a shiny appearance of the hair. The clinically light bands are the abnormal areas due to cavities within the cortex. The pathogenesis remains unknown. OBJECTIVES To investigate the expression of the basement membrane zone (BMZ) components in pili annulati hair follicles of the scalp. METHODS Transmission electron microscopy (TEM) was carried out on scalp sections of six individuals with pili annulati and six controls. Longitudinal sections of scalp tissues from four individuals with pili annulati and six normal controls were studied by immunohistochemistry with a panel of monoclonal antibodies to the following BMZ components: alpha(6)beta(4) integrin, laminin 5, LH39 antigen, laminin 1, collagen IV and collagen VII. RESULTS Using TEM, pili annulati scalp specimens exhibited a reduplicated lamina densa in the region of the root bulb in comparison with the single thin electron-dense band in controls. Using immunohistochemistry, there was a wavy BMZ in pili annulati follicles with antibodies to components of the lamina lucida, lamina densa and anchoring fibrils, whereas the BMZ in control hair follicles was as a smooth linear band. The expression of the hemidesmosome-associated alpha(6)beta(4) integrin was linear in both pili annulati and control hair follicles. CONCLUSIONS Our results suggest that the genetic defect may be a mutation in proteins involved in signalling and regulation of formation and degradation of the lamina densa and sublamina densa region resulting in abnormal assembly or remodelling of the BMZ.
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Affiliation(s)
- K A Giehl
- Department of Dermatology, Ludwig-Maximilian-University, 80337 Munich, Germany
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Frambach T, Lohmann C, Sylvia V, Dean D, Dietl J, Boyan B, Schwartz Z. Die Östrogen-abhängige Aktivierung von Proteinkinase C in Östrogen-Rezeptor-positiven MCF-7-Brustkrebszellen und Östrogen-negativen HCC38-Zellen kann durch Tamoxifen inhibiert werden. Geburtshilfe Frauenheilkd 2003. [DOI: 10.1055/s-2003-815243] [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: 10/20/2022] Open
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Daumas F, Destainville N, Millot C, Lopez A, Dean D, Salomé L. Interprotein interactions are responsible for the confined diffusion of a G-protein-coupled receptor at the cell surface. Biochem Soc Trans 2003; 31:1001-5. [PMID: 14505468 DOI: 10.1042/bst0311001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The monitoring of the movements of membrane proteins (or lipids) by single-particle tracking enables one to obtain reliable insights into the complex dynamic organization of the plasma membrane constituents. Using this technique, we investigated the diffusional behaviour of a G-protein-coupled receptor. The trajectories of the receptors revealed a diffusion mode combining a short-term rapid confined diffusion with a long-term slow diffusion. A detailed statistical analysis shows that the receptors have a diffusion confined to a domain which itself diffuses, the confinement being due to long-range attractive inter-protein interactions. The existing models of the dynamic organization of the cell membrane cannot explain our results. We propose a theoretical Brownian model of interacting proteins that is consistent with the experimental observations and accounts for the variations found as a function of the domain size of the short-term and long-term diffusion coefficients.
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Affiliation(s)
- F Daumas
- Institut de Pharmacologie et Biologie Structurale, UMR CNRS 5089, 205, route de Narbonne, 31077 Toulouse cedex, France
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Chuang YH, Dean D, Allen J, Dawber R, Wojnarowska F. Comparison between the expression of basement membrane zone antigens of human interfollicular epidermis and anagen hair follicle using indirect immunofluorescence. Br J Dermatol 2003; 149:274-81. [PMID: 12932232 DOI: 10.1046/j.1365-2133.2003.05468.x] [Citation(s) in RCA: 19] [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: 11/20/2022]
Abstract
BACKGROUND The composition of the basement membrane zone (BMZ) or dermal-epidermal junction in the interfollicular skin has been well documented. However, little is known about the BMZ or connective tissue-epithelial junction along the hair follicle. OBJECTIVES To determine whether the BMZ antigens in the interfollicular epidermis are also present in the BMZ of the anagen hair follicle and to compare whether the expression and distribution of the BMZ components vary between the interfollicular epidermis and the anagen follicle and within different regions of the hair follicle. METHODS Longitudinal cryostat sections of scalp margin specimens from four adult patients undergoing cosmetic surgery, and without known pathology were stained with a panel of monoclonal and polyclonal antibodies to different BMZ constituents using standard indirect immunofluorescence. RESULTS All the BMZ antigens found in the normal interfollicular epidermis were expressed in the anagen follicle; however, there were regional variations in the intensity and patterns of fluorescence. All the antigens were expressed in a continuous linear pattern along the BMZ of the interfollicular skin, the infundibulum, and the middle part of the hair follicle. Differences were observed in the lower follicle and the hair bulb. There was continuous expression throughout the BMZ of the follicle of laminin-1 and collagen IV, but in contrast, expression of other antigens decreased down the lower follicle. There was weak or even negative staining with antibodies to alpha 6 beta 4 integrin, laminin-5, anchoring filaments, and type VII collagen in the outer aspect of the bulb compared with the hair papilla. In addition, there were special patterns observed along the bilateral middle and lower follicle. CONCLUSIONS Despite the common embryological origin between the interfollicular epidermis and the hair follicle, there is variation in the expression of the BMZ antigens. This may be explained by the histological specialization and functional requirements that reflect the dynamic hair growth cycle.
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Affiliation(s)
- Y H Chuang
- Department of Dermatology, The Churchill, Oxford Radcliffe Hospital, Old Road, Headington, Oxford OX3 7LJ, UK
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Ruderman NB, Park H, Kaushik VK, Dean D, Constant S, Prentki M, Saha AK. AMPK as a metabolic switch in rat muscle, liver and adipose tissue after exercise. Acta Physiol Scand 2003; 178:435-42. [PMID: 12864749 DOI: 10.1046/j.1365-201x.2003.01164.x] [Citation(s) in RCA: 166] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
UNLABELLED An increasing body of evidence has revealed that activation of adenosine monophosphate (AMP)-activated protein kinase (AMPK)-activated protein kinase increases fatty acid oxidation by lowering the concentration of malonyl coenzyme A (CoA), an inhibitor of carnitine palmitoyl transferase 1. Studies carried out primarily in skeletal muscle suggest that AMPK modulates the concentration of malonyl CoA by concurrently phosphorylating and inhibiting acetyl CoA carboxylase (ACC), the rate limiting enzyme in malonyl CoA synthesis, and phosphorylating and activating malonyl CoA decarboxylase (MCD), an enzyme involved in its degradation. We have recently observed that AMPK and MCD activities are increased and ACC activity diminished in skeletal muscle, liver and, surprisingly, in adipose tissue 30 min following exercise (treadmill run) in normal rats. In liver and adipose tissue these changes were associated with a decrease in the activity of glycerol-3-phosphate acyltransferase (GPAT), which catalyses the first committed reaction in glycerolipid synthesis and, which like ACC, is phosphorylated and inhibited by AMPK. Similar changes in ACC, MCD and GPAT were observed following the administration of 5-aminoimidazole 4-carboxamide-riboside (AICAR), further indicating that the exercise-induced alterations in these enzymes were AMPK-mediated. CONCLUSIONS (1) AMPK plays a major role in regulating lipid metabolism in multiple tissues following exercise. (2) The net effect of its activation is to increase fatty acid oxidation and diminish glycerolipid synthesis. (3) The relevance of these findings to the regulation of muscle glycogen repletion in the post-exercise state and to the demonstrated ability of AMPK activation to decrease adiposity and increase insulin sensitivity in rodents remains to be determined.
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Affiliation(s)
- N B Ruderman
- Diabetes Unit, Section of Endocrinology and Department of Medicine, Boston University Medical Center, Boston, MA 02118, USA
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Sheridan AT, Hollowood K, Sakuntabhai A, Dean D, Hovnanian A, Burge S. Expression of sarco/endo-plasmic reticulum Ca2+-ATPase type 2 isoforms (SERCA2) in normal human skin and mucosa, and Darier's disease skin. Br J Dermatol 2002; 147:670-4. [PMID: 12366411 DOI: 10.1046/j.1365-2133.2002.04916.x] [Citation(s) in RCA: 16] [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
BACKGROUND The recent report that mutations in ATP2A2, which encodes the Ca2+ transporting sarco/endo-plasmic reticulum pump type 2 isoforms (SERCA2), cause Darier's disease (DD) suggests that SERCA2 plays an important role in epidermal cell adhesion and differentiation. However, no data exist regarding SERCA2 expression in normal human skin, mucosa and DD. OBJECTIVES We have therefore investigated SERCA2 expression in normal human skin (40 samples), oral and vaginal mucosa (13 samples) and DD lesional skin (six samples). MATERIALS AND METHODS These investigations were performed with a mouse monoclonal antibody specific for human SERCA2, using a standard ABC immunoperoxidase technique. RESULTS SERCA2 was expressed in all specimens. SERCA2 expression was pronounced in the subnuclear aspect of basal epidermal keratinocytes, with variable suprabasal expression. SERCA2 expression was also observed in the infundibulum and outer root sheath of hair follicles; germinative and mature cells of sebaceous glands; secretory coil and duct of eccrine glands; apocrine gland cells, and arrector pili muscle. Fibroblasts and blood vessels (endothelium and muscle) expressed SERCA2, whereas nerves did not. SERCA2 expression was observed throughout oral and vaginal mucosa. In DD skin, strong SERCA2 positivity was detected in the basal, suprabasal and acantholytic lesional cells. Perilesional DD skin was comparable to normal skin. CONCLUSIONS These findings support the hypothesis that SERCA2 is an important player in cutaneous biology, and provide baseline data that will facilitate the design and interpretation of functional studies of cutaneous SERCA2.
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Affiliation(s)
- A T Sheridan
- Department of Dermatology, The Oxford Radcliffe Hospitals, Old Road, Headington, UK
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Seog J, Dean D, Plaas AHK, Wong-Palms S, Grodzinsky AJ, Ortiz C. Direct Measurement of Glycosaminoglycan Intermolecular Interactions via High-Resolution Force Spectroscopy. Macromolecules 2002. [DOI: 10.1021/ma0121621] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. Seog
- Departments of Mechanical Engineering, Electrical Engineering and Computer Science, and Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139; and Department of Biochemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
| | - D. Dean
- Departments of Mechanical Engineering, Electrical Engineering and Computer Science, and Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139; and Department of Biochemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
| | - A. H. K. Plaas
- Departments of Mechanical Engineering, Electrical Engineering and Computer Science, and Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139; and Department of Biochemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
| | - S. Wong-Palms
- Departments of Mechanical Engineering, Electrical Engineering and Computer Science, and Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139; and Department of Biochemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
| | - A. J. Grodzinsky
- Departments of Mechanical Engineering, Electrical Engineering and Computer Science, and Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139; and Department of Biochemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
| | - C. Ortiz
- Departments of Mechanical Engineering, Electrical Engineering and Computer Science, and Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139; and Department of Biochemistry, University of South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33620
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Abstract
The photocross-linking of poly(propylene fumarate) (PPF) to form porous scaffolds for bone tissue engineering applications was investigated. PPF was cross-linked using the photoinitiator bis(2,4,6-trimethylbenzoyl) phenylphosphine oxide (BAPO) and exposure to 30 min of long wavelength ultraviolet (UV) light. The porous photocross-linked PPF scaffolds (6.5 mm diameter cylinders) were synthesized by including a NaCl porogen (70, 80, and 90 wt% at cross-linking) prior to photocross-linking. After UV exposure, the samples were placed in water to remove the soluble porogen, revealing the porous PPF scaffold. As porogen leaching has not been used often with cross-linked polymers, and even more rarely with photoinitiated cross-linking, a study of the efficacy of this strategy and the properties of the resulting material was required. Results show that the inclusion of a porogen does not significantly alter the photoinitiation process and the resulting scaffolds are homogeneously cross-linked throughout their diameter. It was also shown that porosity can be generally controlled by porogen content and that scaffolds synthesized with at least 80 wt% porogen possess an interconnected pore structure. Compressive mechanical testing showed scaffold strength to decrease with increasing porogen content. The strongest scaffolds with interconnected pores had an elastic modulus of 2.3+/-0.5 MPa and compressive strength at 1% yield of 0.11+/-0.02 MPa. This work has shown that a photocross-linking/porogen leaching technique is a viable method to form porous scaffolds from photoinitiated materials.
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Affiliation(s)
- J P Fisher
- Department of Bioengineering, Rice University, Houston, TX 77251-1892, USA
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Johnston SC, Messina LM, Browner WS, Lawton MT, Morris C, Dean D. C-reactive protein levels and viable Chlamydia pneumoniae in carotid artery atherosclerosis. Stroke 2001; 32:2748-52. [PMID: 11739967 DOI: 10.1161/hs1201.099631] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
BACKGROUND AND PURPOSE An elevated serum level of C-reactive protein, an inflammatory marker, is an independent predictor of stroke and coronary artery disease. To determine whether chronic infection with Chlamydia pneumoniae, which has been identified in atherosclerotic plaques, is responsible for systemic inflammation, we studied the association between serum C-reactive protein levels and infection of carotid artery atherosclerotic plaque with viable C pneumoniae. METHODS Serum C-reactive protein levels were obtained before endarterectomy for carotid artery stenosis. Plaques were tested for C pneumoniae mRNA, an indicator of viability, and DNA by polymerase chain reaction of DNA and cDNA, respectively. RESULTS Forty-eight samples were studied, of which 18 (38%; 95% CI, 23 to 50) were infected with viable C pneumoniae as evidenced by isolated chlamydial mRNA. All 18 of these samples, plus 1 additional sample, were positive for chlamydial DNA. Serum C-reactive protein levels were higher in those with viable C pneumoniae compared with those without infection (median, 8 mg/L versus undetectable; P=0.045 by Wilcoxon rank-sum test). In multivariable models, the only independent predictor of the presence of viable C pneumoniae was a detectable C-reactive protein level (odds ratio, 4.2; 95% CI, 1.1 to 17; P=0.04). CONCLUSIONS Viable C pneumoniae are present in a substantial portion of carotid artery atherosclerotic plaques and are associated with increased serum C-reactive protein levels. These findings may explain the link between elevated C-reactive protein levels and the risk of cardiovascular disease and stroke but should be reproduced in a larger cohort.
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Affiliation(s)
- S C Johnston
- Neurovascular Service, Department of Neurology, University of California, San Francisco, USA.
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Baillie TA, Halpin RA, Matuszewski BK, Geer LA, Chavez-Eng CM, Dean D, Braun M, Doss G, Jones A, Marks T, Melillo D, Vyas KP. Mechanistic studies on the reversible metabolism of rofecoxib to 5-hydroxyrofecoxib in the rat: evidence for transient ring opening of a substituted 2-furanone derivative using stable isotope-labeling techniques. Drug Metab Dispos 2001; 29:1614-28. [PMID: 11717181] [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] Open
Abstract
Rofecoxib is a potent and highly selective cyclooxygenase-2 inhibitor used for the treatment of osteoarthritis and pain. Following administration of [4-(14)C]rofecoxib to intact rats, the plasma C(max) (at approximately 1 h) was followed by a secondary C(max) (at approximately 10 h), which was not observed in bile duct-cannulated rats. Following administration of [4-(14)C]5-hydroxyrofecoxib to intact or bile duct-cannulated rats, radiolabeled rofecoxib was detected in plasma, and once again a secondary C(max) for rofecoxib was observed (at approximately 10 h), which occurred only in the intact animals. These results indicate that reversible metabolism of rofecoxib to 5-hydroxyrofecoxib occurs in the rat and that the process is dependent upon an uninterrupted bile flow. Studies on the contents of the gastrointestinal tract of rats showed that conversion of 5-hydroxyrofecoxib to parent compound occurs largely in the lower intestine. Treatment of rats with [5-(18)O]5-hydroxyrofecoxib, followed by liquid chromatography-tandem mass spectrometry analyses of plasma samples, confirmed that 5-hydroxyrofecoxib undergoes metabolism to the parent drug, yielding [1-(18)O]rofecoxib, [2-(18)O]rofecoxib, and unlabeled rofecoxib. Similarly, treatment with [1,2-(18)O(2)]rofecoxib afforded the same three isotopic variants of rofecoxib. These findings are consistent with a metabolic sequence involving 5-hydroxylation of rofecoxib, biliary elimination of the corresponding glucuronide, and deconjugation of the glucuronide in the lower gastrointestinal tract. Reduction of the 5-hydroxyrofecoxib thus liberated yields a hydroxyacid that cyclizes spontaneously to regenerate rofecoxib, which is reabsorbed and enters the systemic circulation. This sequence represents a novel form of enterohepatic recycling and reflects the susceptibility of 5-hydroxyrofecoxib, as well as rofecoxib itself, to reversible 2-furanone ring opening under in vivo conditions.
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Affiliation(s)
- T A Baillie
- Department of Drug Metabolism, Merck Research Laboratories, West Point, Pennsylvania 19486, USA.
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Loo WJ, Dean D, Wojnarowska F. A severe persistent case of recurrent pemphigoid gestationis successfully treated with minocycline and nicotinamide. Clin Exp Dermatol 2001; 26:726-7. [PMID: 11722465 DOI: 10.1046/j.1365-2230.2001.00926-2.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Millman KL, Tavaré S, Dean D. Recombination in the ompA gene but not the omcB gene of Chlamydia contributes to serovar-specific differences in tissue tropism, immune surveillance, and persistence of the organism. J Bacteriol 2001; 183:5997-6008. [PMID: 11567000 PMCID: PMC99679 DOI: 10.1128/jb.183.20.5997-6008.2001] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Sequences of the major outer membrane protein (MOMP) gene (ompA) and the outer membrane complex B protein gene (omcB) from Chlamydia trachomatis, Chlamydia pneumoniae, and Chlamydia psittaci were analyzed for evidence of intragenic recombination and for linkage equilibrium. The Sawyer runs test, compatibility matrices, and index of association analyses provided substantial evidence that there has been a history of intragenic recombination at ompA including one instance of interspecies recombination between the C. trachomatis mouse pneumonitis strain and the C. pneumoniae horse N16 strain. Although none of these methods detected intragenic recombination within omcB, differences in divergence reported in earlier studies suggested that there has been intergenic recombination involving omcB, and the analyses presented in this study are consistent with this. For C. trachomatis, index-of-association analyses suggested a higher degree of recombination for C class than for B class strains and a higher degree of recombination in the downstream half of ompA. In concordance with these findings, many significant breakpoints were found in variable segments 3 and 4 of MOMP for the recombinant strains D/B120, G/UW-57, E/Bour, and LGV-98 identified in this study. We provide examples of how genetic diversity generated by repeated recombination in these regions may be associated with evasion of immune surveillance, serovar-specific differences in tissue tropism, and persistence.
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Affiliation(s)
- K L Millman
- Department of Preventive Medicine, University of Southern California Keck School of Medicine, Los Angeles, California 94609, USA
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