1
|
Chan S, Cazzolli R, Jaure A, Johnson DW, Hawley CM, Craig JC, Sautenet B, van Zwieten A, Cao C, Dobrijevic E, Wilson G, Scholes-Robertson N, Carter S, Vastani T, Cho Y, Blumberg E, Brennan DC, Huuskes BM, Knoll G, Kotton C, Mamode N, Muller E, Phan Ha HA, Tedesco-Silva H, White DM, Viecelli AK. Report of the Standardized Outcomes in Nephrology-transplant Consensus Workshop on Establishing a Core Outcome Measure for Infection in Kidney Transplant Recipients. Transplantation 2024; 108:588-592. [PMID: 38385339 DOI: 10.1097/tp.0000000000004839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Affiliation(s)
- Samuel Chan
- Department of Kidney and Transplant Services, Princess Alexandra Hospital, Brisbane, QLD, Australia
- Australasian Kidney Trials Network and the Medical School, The University of Queensland, Brisbane, QLD, Australia
- Translational Research Institute, Brisbane, QLD, Australia
| | - Rosanna Cazzolli
- Sydney School of Public Health, Faculty of Medicine and Health, NSW, Australia
- Centre for Kidney Research, The Children's Hospital at Westmead, NSW, Australia
| | - Allison Jaure
- Sydney School of Public Health, Faculty of Medicine and Health, NSW, Australia
- Centre for Kidney Research, The Children's Hospital at Westmead, NSW, Australia
| | - David W Johnson
- Department of Kidney and Transplant Services, Princess Alexandra Hospital, Brisbane, QLD, Australia
- Australasian Kidney Trials Network and the Medical School, The University of Queensland, Brisbane, QLD, Australia
- Translational Research Institute, Brisbane, QLD, Australia
| | - Carmel M Hawley
- Department of Kidney and Transplant Services, Princess Alexandra Hospital, Brisbane, QLD, Australia
- Australasian Kidney Trials Network and the Medical School, The University of Queensland, Brisbane, QLD, Australia
- Translational Research Institute, Brisbane, QLD, Australia
| | - Jonathan C Craig
- Sydney School of Public Health, Faculty of Medicine and Health, NSW, Australia
- Centre for Kidney Research, The Children's Hospital at Westmead, NSW, Australia
- College of Medicine and Public Health, Flinders University, SA, Australia
| | - Benedicte Sautenet
- Sydney School of Public Health, Faculty of Medicine and Health, NSW, Australia
- Centre for Kidney Research, The Children's Hospital at Westmead, NSW, Australia
| | - Anita van Zwieten
- Sydney School of Public Health, Faculty of Medicine and Health, NSW, Australia
- Centre for Kidney Research, The Children's Hospital at Westmead, NSW, Australia
| | - Christopher Cao
- Department of Kidney and Transplant Services, Princess Alexandra Hospital, Brisbane, QLD, Australia
| | - Ellen Dobrijevic
- Sydney School of Public Health, Faculty of Medicine and Health, NSW, Australia
- Centre for Kidney Research, The Children's Hospital at Westmead, NSW, Australia
| | - Greg Wilson
- Australasian Kidney Trials Network and the Medical School, The University of Queensland, Brisbane, QLD, Australia
| | - Nicole Scholes-Robertson
- Centre for Kidney Research, The Children's Hospital at Westmead, NSW, Australia
- College of Medicine and Public Health, Flinders University, SA, Australia
| | - Simon Carter
- Sydney School of Public Health, Faculty of Medicine and Health, NSW, Australia
| | - Tom Vastani
- Sydney School of Public Health, Faculty of Medicine and Health, NSW, Australia
| | - Yeoungjee Cho
- Department of Kidney and Transplant Services, Princess Alexandra Hospital, Brisbane, QLD, Australia
| | - Emily Blumberg
- Division of Infectious Diseases, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA
| | | | - Brooke M Huuskes
- Department of Microbiology, Anatomy, Physiology and Pharmacology, School of Agriculture, Biomedicine and Environment, La Trobe University, Melbourne, VIC, Australia
| | - Greg Knoll
- Division of Nephrology, Department of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Camille Kotton
- Transplant and Immunocompromised Host Infectious Diseases Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA
| | - Nizam Mamode
- Department of Transplantation, Guy's and St Thomas' NHS Foundation Trust, London, England, United Kingdom
| | - Elmi Muller
- Department of Surgery, Groote Schuur Hospital, University of Cape Town, Cape Town, South Africa
| | - Hai An Phan Ha
- Kidney Diseases and Dialysis Department, Viet Duc University Hospital, Vietnam
| | - Helio Tedesco-Silva
- Division of Nephrology, Hospital do Rim, Universidade Federal de Sao Paulo, Sao Paulo, Brazil
| | - David M White
- Centre for Health Action and Policy, The Rogosin Institute, New York, NY
| | - Andrea K Viecelli
- Department of Kidney and Transplant Services, Princess Alexandra Hospital, Brisbane, QLD, Australia
- Australasian Kidney Trials Network and the Medical School, The University of Queensland, Brisbane, QLD, Australia
- Translational Research Institute, Brisbane, QLD, Australia
| |
Collapse
|
2
|
Dember LM, Hsu JY, Bernardo L, Cavanaugh KL, Charytan DM, Crowley ST, Cukor D, Doorenbos AZ, Edwards DA, Esserman D, Fischer MJ, Jhamb M, Joffe S, Johansen KL, Kalim S, Keefe FJ, Kimmel PL, Krebs EE, Kuzla N, Mehrotra R, Mishra P, Pellegrino B, Steel JL, Unruh ML, White DM, Yabes JG, Becker WC. The design and baseline characteristics for the HOPE Consortium Trial to reduce pain and opioid use in hemodialysis. Contemp Clin Trials 2024; 136:107409. [PMID: 38086444 PMCID: PMC10922728 DOI: 10.1016/j.cct.2023.107409] [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: 08/11/2023] [Revised: 11/07/2023] [Accepted: 12/06/2023] [Indexed: 01/07/2024]
Abstract
The HOPE Consortium Trial to Reduce Pain and Opioid Use in Hemodialysis (HOPE Trial) is a multicenter randomized trial addressing chronic pain among patients receiving maintenance hemodialysis for end-stage kidney disease. The trial uses a sequential, multiple assignment design with a randomized component for all participants (Phase 1) and a non-randomized component for a subset of participants (Phase 2). During Phase 1, participants are randomized to Pain Coping Skills Training (PCST), an intervention designed to increase self-efficacy for managing pain, or Usual Care. PCST consists of weekly, live, coach-led cognitive behavioral therapy sessions delivered by video- or tele-conferencing for 12 weeks followed by daily interactive voice response sessions delivered by telephone for an additional 12 weeks. At 24 weeks (Phase 2), participants in both the PCST and Usual Care groups taking prescription opioid medications at an average dose of ≥20 morphine milligram equivalents per day are offered buprenorphine, a partial opioid agonist with a more favorable safety profile than full-agonist opioids. All participants are followed for 36 weeks. The primary outcome is pain interference ascertained, for the primary analysis, at 12 weeks. Secondary outcomes include additional patient-reported measures and clinical outcomes including falls, hospitalizations, and death. Exploratory outcomes include acceptability, tolerability, and efficacy of buprenorphine. The enrollment target of 640 participants was met 27 months after trial initiation. The findings of the trial will inform the management of chronic pain, a common and challenging issue for patients treated with maintenance hemodialysis. NCT04571619.
Collapse
Affiliation(s)
- Laura M Dember
- Renal-Electrolyte and Hypertension Division, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States of America; Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States of America; Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States of America.
| | - Jesse Y Hsu
- Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States of America; Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States of America
| | - Leah Bernardo
- Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States of America
| | - Kerri L Cavanaugh
- Division of Nephrology & Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, United States of America
| | - David M Charytan
- Nephrology Division, Department of Medicine, New York University Grossman School of Medicine, and NYU Langone Health, New York, NY, United States of America
| | - Susan T Crowley
- Section of Nephrology, Department of Medicine, Yale School of Medicine, New Haven, CT, United States of America; Kidney Medicine Program, Medical Services, VA Connecticut Healthcare System, West Haven, CT, United States of America
| | - Daniel Cukor
- Behavioral Health, The Rogosin Institute, New York, NY, United States of America
| | - Ardith Z Doorenbos
- College of Nursing, University of Illinois Chicago, Chicago, IL, United States of America
| | - David A Edwards
- Division of Pain Medicine, Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, TN, United States of America
| | - Denise Esserman
- Department of Biostatistics, Yale School of Public Health, New Haven, CT, United States of America
| | - Michael J Fischer
- Department of Medicine, University of Illinois Chicago, Chicago, IL, United States of America; Medical Service, Jesse Brown VA Medical Center, Chicago, IL, United States of America; Center of Innovation for Complex Chronic Healthcare, Edward Hines Jr. VA Hospital, Hines, IL, United States of America
| | - Manisha Jhamb
- Renal and Electrolyte Division, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States of America
| | - Steven Joffe
- Department of Medical Ethics and Health Policy, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States of America
| | - Kirsten L Johansen
- Nephrology Division, Hennepin Healthcare, Department of Medicine, University of Minnesota, Minneapolis, MN, United States of America
| | - Sahir Kalim
- Department of Medicine, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States of America
| | - Francis J Keefe
- Pain Prevention and Treatment Research Program, Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine, Durham, NC, United States of America
| | - Paul L Kimmel
- Division of Kidney, Urologic, and Hematologic Diseases, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD, United States of America
| | - Erin E Krebs
- General Internal Medicine, Minneapolis VA Health Care System, University of Minnesota Medical School, Minneapolis, MN, United States of America
| | - Natalie Kuzla
- Clinical Research Computing Unit, Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States of America
| | - Rajnish Mehrotra
- Kidney Research Institute, Division of Nephrology, Department of Medicine, University of Washington School of Medicine, Seattle, WA, United States of America
| | - Puneet Mishra
- Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, TN, United States of America
| | - Bethany Pellegrino
- Division of Nephrology, Department of Medicine, West Virginia University School of Medicine, Morgantown, WV, United States of America
| | - Jennifer L Steel
- Division of Hepatobiliary Surgery, Department of Surgery, Psychiatry, and Psychology, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States of America
| | - Mark L Unruh
- Division of Nephrology, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, United States of America; Research Service, Department of Medicine, Raymond G. Murphy Veterans Affairs Medical Center and University of New Mexico School of Medicine, Albuquerque, NM, United States of America
| | - David M White
- American Association of Kidney Patients, Tampa, FL, United States of America
| | - Jonathan G Yabes
- Division of General Internal Medicine, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States of America
| | - William C Becker
- Section of General Internal Medicine, Department of Medicine, Yale School of Medicine, New Haven, CT, United States of America; Pain Research, Informatics, Multi-morbidities & Education Center of Innovation, VA Connecticut Healthcare System, West Haven, CT, United States of America
| |
Collapse
|
3
|
Flythe JE, Forfang D, Gedney N, White DM, Wilkie C, Cavanaugh KL, Harris RC, Unruh M, Squillaci G, West M, Mansfield C, Soloe CS, Treiman K, Wood D, Hurst FP, Neuland CY, Saha A, Sheldon M, Tarver ME. Development of a Patient Preference Survey for Wearable Kidney Replacement Therapy Devices. Kidney360 2022; 3:1197-1209. [PMID: 35919522 PMCID: PMC9337889 DOI: 10.34067/kid.0001862022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Accepted: 05/03/2022] [Indexed: 01/11/2023]
Abstract
Background Recent innovations have the potential to disrupt the current paradigm for kidney failure treatment. The US Food and Drug Administration is committed to incorporating valid scientific evidence about how patients weigh the benefits and risks of new devices into their decision making, but to date, premarket submission of patient preference information (PPI) has been limited for kidney devices. With input from stakeholders, we developed a survey intended to yield valid PPI, capturing how patients trade off the potential benefits and risks of wearable dialysis devices and in-center hemodialysis. Methods We conducted concept elicitation interviews with individuals receiving dialysis to inform instrument content. After instrument drafting, we conducted two rounds of pretest interviews to evaluate survey face validity, comprehensibility, and perceived relevance. We pilot tested the survey with in-center hemodialysis patients to assess comprehensibility and usability further. Throughout, we used participant input to guide survey refinements. Results Thirty-six individuals receiving in-center or home dialysis participated in concept elicitation (N=20) and pretest (N=16) interviews. Participants identified reduced fatigue, lower treatment burden, and enhanced freedom as important benefits of a wearable device, and many expressed concerns about risks related to device disconnection-specifically bleeding and infection. We drafted a survey that included descriptions of the risks of serious bleeding and serious infection and an assessment of respondent willingness to wait for a safer device. Input from pretest interviewees led to various instrument modifications, including treatment descriptions, item wording, and risk-level explanations. Pilot testing of the updated survey among 24 in-center hemodialysis patients demonstrated acceptable survey comprehensibility and usability, although 50% of patients required some assistance. Conclusions The final survey is a 54-item web-based instrument that will yield estimates of the maximal acceptable risk for the described wearable device and willingness to wait for wearable devices with lower risk.
Collapse
Affiliation(s)
- Jennifer E. Flythe
- University of North Carolina (UNC) Kidney Center, Division of Nephrology and Hypertension, Department of Medicine, UNC School of Medicine, Chapel Hill, North Carolina,Cecil G. Sheps Center for Health Services Research, UNC, Chapel Hill, North Carolina
| | - Derek Forfang
- Kidney Health Initiative Patient and Family Partnership Council, San Pablo, California
| | | | - David M. White
- Kidney Health Initiative Patient and Family Partnership Council, Hillcrest Heights, Maryland
| | - Caroline Wilkie
- Kidney Health Initiative Patient and Family Partnership Council, Punta Gorda, Florida
| | - Kerri L. Cavanaugh
- Division of Nephrology and Hypertension, Vanderbilt University Medical Center, Nashville, Tennessee,Center for Effective Health Communication, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Raymond C. Harris
- Division of Nephrology and Hypertension, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Mark Unruh
- School of Medicine, University of New Mexico, Albuquerque, New Mexico
| | - Grace Squillaci
- Kidney Health Initiative and American Society of Nephrology, Washington, DC
| | - Melissa West
- Kidney Health Initiative and American Society of Nephrology, Washington, DC
| | - Carol Mansfield
- RTI Health Solutions, Research Triangle Park, North Carolina
| | - Cindy S. Soloe
- RTI Health Solutions, Research Triangle Park, North Carolina
| | | | - Dallas Wood
- RTI Health Solutions, Research Triangle Park, North Carolina
| | - Frank P. Hurst
- Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, Maryland
| | - Carolyn Y. Neuland
- Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, Maryland
| | - Anindita Saha
- Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, Maryland
| | - Murray Sheldon
- Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, Maryland
| | - Michelle E. Tarver
- Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, Maryland
| |
Collapse
|
4
|
Chan S, Howell M, Johnson DW, Hawley CM, Tong A, Craig JC, Cao C, Blumberg E, Brennan D, Campbell SB, Francis RS, Huuskes BM, Isbel NM, Knoll G, Kotton C, Mamode N, Muller E, Biostat EMPM, An HPH, Tedesco-Silva H, White DM, Viecelli AK. Critically important outcomes for infection in trials in kidney transplantation: An international survey of patients, caregivers and health professionals. Clin Transplant 2022; 36:e14660. [PMID: 35362617 DOI: 10.1111/ctr.14660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 03/07/2022] [Accepted: 03/29/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND Infections are a common complication following kidney transplantation, but are reported inconsistently in clinical trials. This study aimed to identify the infection outcomes of highest priority for patients/caregivers and health professionals to inform a core outcome set to be reported in all kidney transplant clinical trials. METHODS In an international online survey, participants rated the absolute importance of 16 infections and 8 severity dimensions on 9-point Likert Scales, with 7-9 being critically important. Relative importance was determined using a best-worst scale. Means and proportions of the Likert-scale ratings and best-worst preference scores were calculated. RESULTS 353 healthcare professionals (19 who identified as both patients/caregiver and healthcare professionals) and 220 patients/caregivers (190 patients, 22 caregivers, 8 who identified as both) from 55 countries completed the survey. Both healthcare professionals and patients/caregivers rated bloodstream (mean 8.4 and 8.5 respectively; aggregate 8.5), kidney/bladder (mean 7.9 and 8.4; aggregate 8.1) and BK virus (mean 8.1 and 8.6; aggregate 8.3) as the top 3 most critically important infection outcomes, whilst infectious death (mean 8.8 and 8.6; aggregate 8.7), impaired graft function (mean 8.4 and 8.7; aggregate 8.5) and admission to the intensive care unit (mean 8.2 and 8.3; aggregate 8.2) were the top 3 severity dimensions. Relative importance (best-worst) scores were consistent. CONCLUSIONS Healthcare professionals and patients/caregivers consistently identified bloodstream infection, kidney/bladder infections and BK virus as the three most important infection outcomes, and infectious death, admission to intensive care unit and infection impairing graft function as the three most important infection severity outcomes. This article is protected by copyright. All rights reserved.
Collapse
Affiliation(s)
- Samuel Chan
- Department of Nephrology, Princess Alexandra Hospital, Brisbane, Queensland, Australia.,Faculty of Medicine, The University of Queensland, Brisbane, Queensland, Australia.,Translational Research Institute, Brisbane, Queensland, Australia
| | - Martin Howell
- Sydney School of Public Health, Faculty of Medicine and Health.,Centre for Kidney Research, The Children's Hospital at Westmead, Australia
| | - David W Johnson
- Department of Nephrology, Princess Alexandra Hospital, Brisbane, Queensland, Australia.,Faculty of Medicine, The University of Queensland, Brisbane, Queensland, Australia.,Translational Research Institute, Brisbane, Queensland, Australia
| | - Carmel M Hawley
- Department of Nephrology, Princess Alexandra Hospital, Brisbane, Queensland, Australia.,Faculty of Medicine, The University of Queensland, Brisbane, Queensland, Australia.,Translational Research Institute, Brisbane, Queensland, Australia
| | - Allison Tong
- Sydney School of Public Health, Faculty of Medicine and Health.,Centre for Kidney Research, The Children's Hospital at Westmead, Australia
| | - Jonathan C Craig
- College of Medicine and Public Health, Flinders University, Adelaide, Australia
| | - Christopher Cao
- Department of Nephrology, Princess Alexandra Hospital, Brisbane, Queensland, Australia
| | - Emily Blumberg
- Division of Infectious Diseases, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Daniel Brennan
- Division of Nephrology, Washington University School of Medicine, St. Louis, MO, United States of America
| | - Scott B Campbell
- Department of Nephrology, Princess Alexandra Hospital, Brisbane, Queensland, Australia.,Faculty of Medicine, The University of Queensland, Brisbane, Queensland, Australia
| | - Ross S Francis
- Department of Nephrology, Princess Alexandra Hospital, Brisbane, Queensland, Australia.,Faculty of Medicine, The University of Queensland, Brisbane, Queensland, Australia
| | - Brooke M Huuskes
- Centre for Cardiovascular Biology and Disease Research, La Trobe University, Melbourne, Victoria, Australia
| | - Nicole M Isbel
- Department of Nephrology, Princess Alexandra Hospital, Brisbane, Queensland, Australia.,Faculty of Medicine, The University of Queensland, Brisbane, Queensland, Australia
| | - Greg Knoll
- Division of Nephrology, Department of Medicine, University of Ottawa, Ottawa
| | - Camille Kotton
- Transplant and Immunocompromised Host Infectious Diseases Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Nizam Mamode
- Department of Transplantation, Guy's and St Thomas' NHS Foundation Trust, London, SE1 9RT, United Kingdom
| | - Elmi Muller
- Department of Surgery, Groote Schuur Hospital, University of Cape Town, Cape Town, South Africa
| | - Elaine M Pascoe M Biostat
- Department of Nephrology, Princess Alexandra Hospital, Brisbane, Queensland, Australia.,Faculty of Medicine, The University of Queensland, Brisbane, Queensland, Australia
| | - Ha Phan Hai An
- Department of Internal Medicine, Division of Nephrology, Viet Duc Hospital, Hanoi Medical University, Vietnam
| | - Helio Tedesco-Silva
- Division of Nephrology, Hospital do Rim, Universidade Federal de Sao Paulo, Sao Paulo, Brazil
| | | | - Andrea K Viecelli
- Department of Nephrology, Princess Alexandra Hospital, Brisbane, Queensland, Australia.,Faculty of Medicine, The University of Queensland, Brisbane, Queensland, Australia.,Translational Research Institute, Brisbane, Queensland, Australia
| |
Collapse
|
5
|
Stavrinos D, McManus B, Mrug S, He H, Gresham B, Albright MG, Svancara AM, Whittington C, Underhill A, White DM. Adolescent driving behavior before and during restrictions related to COVID-19. Accid Anal Prev 2020; 144:105686. [PMID: 32683132 PMCID: PMC7364168 DOI: 10.1016/j.aap.2020.105686] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [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: 06/19/2020] [Revised: 06/30/2020] [Accepted: 07/07/2020] [Indexed: 05/04/2023]
Abstract
INTRODUCTION Understanding who heeds the driving-related COVID-19 restrictions is critical for assisting public health professionals improve response to this and future pandemic events. The purpose of the current study was to characterize driving behavior changes among adolescents as a function of COVID-19 restrictions. It was hypothesized that adolescent driving would be reduced by COVID-19 restrictions, especially for younger teens, non-minorities, females, non-working teens, and those with higher prosocial tendencies. METHODS Participants were licensed drivers in "REACT," a longitudinal study of adolescent driving attention. Upon enrollment in REACT, drivers were required to be age 16 or 18, have been issued a driver's license within the last two weeks, and be fluent in written/spoken English. The current observational cohort study was of drivers reporting driving exposure between February 8 and April 22, 2020. Linear mixed-effects models estimated differences in driving changes between COVID-19 periods. RESULTS Results indicated a decrease across pre-COVID-19 period (February 8 - March 13, 2020) in days driven per week and vehicle miles driven (VMD) was explained by the change of slope post-COVID-19 restrictions (March 14 - April 22, 2020). Post-COVID-19, driving days per week decreased by 37 % and VMD decreased by 35 %. This decrease was lower in ethnic minorities, older adolescents, and employed adolescents. Those with greater dire prosocial tendencies showed greater post-COVID-19 driving decline. DISCUSSION Findings provide early evidence of COVID-19 restriction-related adolescent driving changes suggesting older, employed, minority teens and teens with lower prosocial tendencies are less likely to reduce driving behavior. These observations provide a foundation for more extensive studies of adolescent drivers during various driving and contact restrictions and inform future public health campaigns for social distancing.
Collapse
Affiliation(s)
- Despina Stavrinos
- University of Alabama at Birmingham, Department of Psychology, Campbell Hall 415, 1300 University Blvd, Birmingham, AL, 35223, United States.
| | - Benjamin McManus
- University of Alabama at Birmingham, Department of Psychology, Campbell Hall 415, 1300 University Blvd, Birmingham, AL, 35223, United States.
| | - Sylvie Mrug
- University of Alabama at Birmingham, Department of Psychology, Campbell Hall 415, 1300 University Blvd, Birmingham, AL, 35223, United States.
| | - Harry He
- Regional Planning Commission of Greater Birmingham, 2 20(th)Street North, Birmingham, AL, 35203, United States.
| | - Bria Gresham
- University of Alabama at Birmingham, Department of Psychology, Campbell Hall 415, 1300 University Blvd, Birmingham, AL, 35223, United States.
| | - M Grace Albright
- University of Alabama at Birmingham, Department of Psychology, Campbell Hall 415, 1300 University Blvd, Birmingham, AL, 35223, United States.
| | - Austin M Svancara
- University of Alabama at Birmingham, Department of Psychology, Campbell Hall 415, 1300 University Blvd, Birmingham, AL, 35223, United States.
| | - Caroline Whittington
- University of Alabama at Birmingham, Department of Psychology, Campbell Hall 415, 1300 University Blvd, Birmingham, AL, 35223, United States.
| | - Andrea Underhill
- University of Alabama at Birmingham, Department of Psychology, Campbell Hall 415, 1300 University Blvd, Birmingham, AL, 35223, United States.
| | - David M White
- University of Alabama at Birmingham, Department of Psychology, Campbell Hall 415, 1300 University Blvd, Birmingham, AL, 35223, United States.
| |
Collapse
|
6
|
Tong A, Levey AS, Eckardt KU, Anumudu S, Arce CM, Baumgart A, Dunn L, Gutman T, Harris T, Lightstone L, Scholes-Robertson N, Shen JI, Wheeler DC, White DM, Wilkie M, Craig JC, Jadoul M, Winkelmayer WC. Patient and Caregiver Perspectives on Terms Used to Describe Kidney Health. Clin J Am Soc Nephrol 2020; 15:937-948. [PMID: 32586923 PMCID: PMC7341768 DOI: 10.2215/cjn.00900120] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 04/16/2020] [Indexed: 12/24/2022]
Abstract
BACKGROUND AND OBJECTIVES The language used to communicate important aspects of kidney health is inconsistent and may be conceptualized differently by patients and health professionals. These problems may impair the quality of communication, care, and patient outcomes. We aimed to describe the perspectives of patients on terms used to describe kidney health. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS Patients with CKD (n=54) and caregivers (n=13) from the United States, United Kingdom, and Australia participated in ten focus groups to discuss terms for kidney health (including kidney, renal, CKD, ESKD, kidney failure, and descriptors for kidney function). We analyzed the data using thematic analysis. RESULTS We identified four themes: provoking and exacerbating undue trauma (fear of the unknown, denoting impending death, despair in having incurable or untreatable disease, premature labeling and assumptions, judgment, stigma, and failure of self); frustrated by ambiguity (confused by medicalized language, lacking personal relevance, baffled by imprecision in meaning, and/or opposed to obsolete terms); making sense of the prognostic enigma (conceptualizing level of kidney function, correlating with symptoms and effect on life, predicting progression, and need for intervention); and mobilizing self-management (confronting reality, enabling planning and preparation, taking ownership for change, learning medical terms for self-advocacy, and educating others). CONCLUSIONS The obscurity and imprecision of terms in CKD can be unduly distressing and traumatizing for patients, which can impair decision making and self-management. Consistent and meaningful patient-centered terminology may improve patient autonomy, satisfaction, and outcomes.
Collapse
Affiliation(s)
- Allison Tong
- Sydney School of Public Health, The University of Sydney, Sydney, New South Wales, Australia .,Centre for Kidney Research, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Andrew S Levey
- Division of Nephrology, Tufts Medical Center, Boston, Massachusetts
| | - Kai-Uwe Eckardt
- Medical Department, Division of Nephrology and Internal Intensive Care Medicine, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Samaya Anumudu
- Selzman Institute for Kidney Health, Section of Nephrology, Baylor College of Medicine, Houston, Texas
| | | | - Amanda Baumgart
- Sydney School of Public Health, The University of Sydney, Sydney, New South Wales, Australia.,Centre for Kidney Research, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Louese Dunn
- Sheffield Kidney Institute, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | - Talia Gutman
- Sydney School of Public Health, The University of Sydney, Sydney, New South Wales, Australia.,Centre for Kidney Research, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Tess Harris
- Polycystic Kidney Disease International, London, UK
| | - Liz Lightstone
- Centre for Inflammatory Disease, Faculty of Medicine, Imperial College London, London, UK
| | - Nicole Scholes-Robertson
- Sydney School of Public Health, The University of Sydney, Sydney, New South Wales, Australia.,Centre for Kidney Research, The Children's Hospital at Westmead, Westmead, New South Wales, Australia
| | - Jenny I Shen
- Division of Nephrology and Hypertension, Harbor-UCLA Medical Center, Torrance, California
| | - David C Wheeler
- Centre for Nephrology, University College London, London, UK.,George Institute for Global Health, Sydney, New South Wales, Australia
| | - David M White
- Center for Health Action and Policy, The Rogosin Institute, New York, New York
| | - Martin Wilkie
- Sheffield Kidney Institute, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | - Jonathan C Craig
- College of Medicine and Public Health, Flinders University, Adelaide, South Australia, Australia
| | - Michel Jadoul
- Department of Nephrology, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain, Brussels, Belgium
| | - Wolfgang C Winkelmayer
- Selzman Institute for Kidney Health, Section of Nephrology, Baylor College of Medicine, Houston, Texas
| |
Collapse
|
7
|
Nelson EA, Kraguljac NV, White DM, Jindal RD, Shin AL, Lahti AC. A Prospective Longitudinal Investigation of Cortical Thickness and Gyrification in Schizophrenia. Can J Psychiatry 2020; 65:381-391. [PMID: 32022594 PMCID: PMC7265602 DOI: 10.1177/0706743720904598] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
BACKGROUND Cortical thickness (CT) and gyrification are complementary indices that assess different aspects of gray matter structural integrity. Both neurodevelopment insults and acute tissue response to antipsychotic medication could underlie the known heterogeneity of treatment response and are well-suited for interrogation into the relationship between gray matter morphometry and clinical outcomes in schizophrenia (SZ). METHODS Using a prospective design, we enrolled 34 unmedicated patients with SZ and 23 healthy controls. Patients were scanned at baseline and after a 6-week trial with risperidone. CT and local gyrification index (LGI) values were quantified from structural MRI scans using FreeSurfer 5.3. RESULTS We found reduced CT and LGI in patients compared to controls. Vertex-wise analyses demonstrated that hypogyrification was most prominent in the inferior frontal cortex, temporal cortex, insula, pre/postcentral gyri, temporoparietal junction, and the supramarginal gyrus. Baseline CT was predictive of subsequent response to antipsychotic treatment, and increase in CT after 6 weeks was correlated with greater symptom reductions. CONCLUSIONS In summary, we report evidence of reduced CT and LGI in unmedicated patients compared to controls, suggesting involvement of different aspects of gray matter morphometry in the pathophysiology of SZ. Importantly, we found that lower CT at baseline and greater increase of CT following 6 weeks of treatment with risperidone were associated with better clinical response. Our results suggest that cortical thinning may normalize as a result of a good response to antipsychotic medication, possibly by alleviating potential neurotoxic processes underlying gray matter deterioration.
Collapse
Affiliation(s)
- Eric A Nelson
- Department of Psychology, University of Alabama at Birmingham, AL, USA
| | - Nina V Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, AL, USA
| | - David M White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, AL, USA
| | - Ripu D Jindal
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, AL, USA.,Birmingham Veteran Affairs Medical Center, AL, USA
| | - Ah L Shin
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, AL, USA
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, AL, USA
| |
Collapse
|
8
|
Frölich MA, White DM, Kraguljac NV, Lahti AC. Baseline Functional Connectivity Predicts Connectivity Changes Due to a Small Dose of Midazolam in Older Adults. Anesth Analg 2020; 130:224-232. [PMID: 31498189 DOI: 10.1213/ane.0000000000004385] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND In the perioperative context, benzodiazepines are widely used as anxiolytics. They affect cognition in general, but it is unclear whether the effects of a small dose of the short-acting benzodiazepine midazolam can be assessed objectively. To address this scientific question, we conducted a prospective observational study in adults 55-73 years of age. Using both validated psychometric and functional imaging techniques, we determined whether a 2-mg intravenous (IV) dose of midazolam affects cognitive function. METHODS We measured the effect of 2 mg IV of midazolam with both the well-established Repeatable Battery for the Assessment of Neuropsychological Status test and resting-state functional magnetic imaging (rs-fMRI) in older adults. RESULTS Midazolam reduces immediate and delayed memory and has a profound and robust effect on rs-fMRI. Baseline resting-state connectivity predicts memory decline after midazolam administration. CONCLUSIONS Observed effects of midazolam on brain networks were statistically significant even in a small group of volunteers. If validated by other investigators, resting-state brain connectivity may have utility as a measure to predict sensitivity to midazolam in older adults.
Collapse
Affiliation(s)
| | - David M White
- Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Nina V Kraguljac
- Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Adrienne C Lahti
- Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama
| |
Collapse
|
9
|
Kraguljac NV, Morgan CJ, Reid MA, White DM, Jindal RD, Sivaraman S, Martinak BK, Lahti AC. A longitudinal magnetic resonance spectroscopy study investigating effects of risperidone in the anterior cingulate cortex and hippocampus in schizophrenia. Schizophr Res 2019; 210:239-244. [PMID: 30630705 PMCID: PMC7881837 DOI: 10.1016/j.schres.2018.12.028] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 12/18/2018] [Accepted: 12/19/2018] [Indexed: 12/30/2022]
Abstract
Magnetic Resonance Spectroscopy is a popular approach to probe brain chemistry in schizophrenia (SZ), but no consensus exists as to the extent of alterations. This may be attributable to differential effects of populations studied, brain regions examined, or antipsychotic medication effects. Here, we measured neurometabolites in the anterior cingulate cortex (ACC) and hippocampus, two structurally dissimilar brain regions implicated in the SZ pathophysiology. We enrolled 61 SZ with the goal to scan them before and after six weeks of treatment with risperidone. We also scanned 31 matched healthy controls twice, six weeks apart. Using mixed effect repeated measures linear models to examine the effect of group and time on metabolite levels in each voxel, we report an increase in hippocampal glutamate + glutamine (Glx) in SZ compared to controls (p = 0.043), but no effect of antipsychotic medication (p = 0.330). In the ACC, we did not find metabolite alterations or antipsychotic medication related changes after six weeks of treatment with risperidone. The coefficients for the discriminant function (differentiating SZ from HC) in the ACC were greatest for NAA (-0.83), and in the hippocampus for Glx (0.76), the same metabolites were associated with greater treatment response in patients at trend level. Taken together, our data extends the existing literature by demonstrating regionally distinct metabolite alterations in the same patient group and suggests that antipsychotic medications may have limited effects on metabolite levels in these regions.
Collapse
Affiliation(s)
- Nina V. Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham
| | | | - Meredith A. Reid
- MRI Research Center, Department of Electrical and Computer Engineering, Auburn University
| | - David M. White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham
| | - Ripu D. Jindal
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham,Department of Neurology, Birmingham VA Medical Center
| | - Soumya Sivaraman
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham
| | - Bridgette K. Martinak
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham
| | - Adrienne C. Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham
| |
Collapse
|
10
|
Cadena EJ, White DM, Kraguljac NV, Reid MA, Jindal R, Pixley RM, Lahti AC. Cognitive control network dysconnectivity and response to antipsychotic treatment in schizophrenia. Schizophr Res 2019; 204:262-270. [PMID: 30098853 PMCID: PMC7909720 DOI: 10.1016/j.schres.2018.07.045] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 07/26/2018] [Accepted: 07/31/2018] [Indexed: 12/13/2022]
Abstract
To better understand cognitive control impairment in schizophrenia, it is vital to determine the extent of dysfunctional connectivity in the associated fronto-striatal brain network, with a focus on the connections with the anterior cingulate cortex (ACC), prior to the potential confounding effect of medication. It is also essential to determine the effects following antipsychotic medication and the relationship of those effects on psychosis improvement. Twenty-two patients with schizophrenia, initially unmedicated and after a 6-week course of risperidone, and 20 matched healthy controls (HC) performed a fMRI task twice, six weeks apart. We investigated group and longitudinal differences in ACC-related functional connectivity during performance of a Stroop color task as well as connectivity patterns associated with improvement in psychosis symptoms. Unmedicated patients with schizophrenia showed greater functional connectivity between ACC and bilateral caudate and midbrain and lower connectivity with left putamen compared to healthy controls. At baseline, greater functional connectivity between ACC and bilateral putamen predicted subsequent better treatment response. Change in functional connectivity between ACC and left putamen positively correlated with better treatment response. These results suggest that patterns of functional connectivity in fronto-striatal networks can be utilized to predict potential response to antipsychotic medication. Prior to treatment, brain function may be structured with a predisposition that favors or not treatment response.
Collapse
|
11
|
Reid MA, Salibi N, White DM, Gawne TJ, Denney TS, Lahti AC. 7T Proton Magnetic Resonance Spectroscopy of the Anterior Cingulate Cortex in First-Episode Schizophrenia. Schizophr Bull 2019; 45:180-189. [PMID: 29385594 PMCID: PMC6293230 DOI: 10.1093/schbul/sbx190] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Recent magnetic resonance spectroscopy (MRS) studies suggest that abnormalities of the glutamatergic system in schizophrenia may be dependent on illness stage, medication status, and symptomatology. Glutamatergic metabolites appear to be elevated in the prodromal and early stages of schizophrenia but unchanged or reduced below normal in chronic, medicated patients. However, few of these studies have measured metabolites with high-field 7T MR scanners, which offer higher signal-to-noise ratio and better spectral resolution than 3T scanners and facilitate separation of glutamate and glutamine into distinct signals. In this study, we examined glutamate and other metabolites in the dorsal anterior cingulate cortex (ACC) of first-episode schizophrenia patients. Glutamate and N-acetylaspartate (NAA) were significantly lower in schizophrenia patients vs controls. No differences were observed in levels of glutamine, GABA, or other metabolites. In schizophrenia patients but not controls, GABA was negatively correlated with the total score on the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) as well as the immediate memory and language subscales. Our findings suggest that glutamate and NAA reductions in the ACC may be present early in the illness, but additional large-scale studies are needed to confirm these results as well as longitudinal studies to determine the effect of illness progression and treatment. The correlation between GABA and cognitive function suggests that MRS may be an important technique for investigating the neurobiology underlying cognitive deficits in schizophrenia.
Collapse
Affiliation(s)
- Meredith A Reid
- AU MRI Research Center, Department of Electrical & Computer Engineering, Auburn University
| | | | - David M White
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham
| | - Timothy J Gawne
- Department of Vision Sciences, The University of Alabama at Birmingham
| | - Thomas S Denney
- AU MRI Research Center, Department of Electrical & Computer Engineering, Auburn University
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham,To whom correspondence should be addressed; Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, SC 501, 1720 2 Ave S, Birmingham, AL 35294-0017, US; tel: 205-996-6776, fax: 205-975-4879, e-mail:
| |
Collapse
|
12
|
Sivaraman S, Kraguljac NV, White DM, Morgan CJ, Gonzales SS, Lahti AC. Neurometabolic abnormalities in the associative striatum in antipsychotic-naïve first episode psychosis patients. Psychiatry Res Neuroimaging 2018; 281:101-106. [PMID: 30286325 PMCID: PMC7874514 DOI: 10.1016/j.pscychresns.2018.06.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 06/06/2018] [Accepted: 06/06/2018] [Indexed: 12/23/2022]
Abstract
Schizophrenia is a chronic, often progressive, disorder. Understanding the underlying neurobiology present in the early stages of the illness is as a pivotal step in designing targeted interventions aimed at arresting disease progression. The aim of our study was to examine neurometabolic changes in the dopamine rich associative striatum in medication-naïve first episode psychosis (FEP). We quantified neurometabolites in 14 FEP and 18 healthy controls (HC) matched on key demographic characteristics. Spectra from the voxel in the left associative striatum were acquired using a PRESS sequence (TR/TE = 2000/80 ms; 512 averages). MRS data were quantified in the time domain with AMARES in jMRUI. Choline was significantly elevated in FEP compared to HC. No significant alterations in other metabolites were observed. We did not observe correlations between metabolite levels and clinical characteristics in FEP. Here, we demonstrated elevated choline and a disruption of the relationship between N-acetyl-aspartate and Glx (glutamate + glutamine) in medication-naïve FEP patients in the left striatum indicating possible mitochondrial, membrane and glial dysfunction as an underlying pathological phenomenon. In addition, striatal choline shows promise as a biomarker for FEP that may have utility in clinical trials investigating target engagement in experimental regimens.
Collapse
Affiliation(s)
- Soumya Sivaraman
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Nina V Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - David M White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Charity J Morgan
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Sara S Gonzales
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama, USA.
| |
Collapse
|
13
|
Cadena EJ, White DM, Kraguljac NV, Reid MA, Maximo JO, Nelson EA, Gawronski BA, Lahti AC. A Longitudinal Multimodal Neuroimaging Study to Examine Relationships Between Resting State Glutamate and Task Related BOLD Response in Schizophrenia. Front Psychiatry 2018; 9:632. [PMID: 30555359 PMCID: PMC6281980 DOI: 10.3389/fpsyt.2018.00632] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 11/07/2018] [Indexed: 01/10/2023] Open
Abstract
Previous studies have observed impairments in both brain function and neurometabolite levels in schizophrenia. In this study, we investigated the relationship between brain activity and neurochemistry in off-medication patients with schizophrenia and if this relationship is altered following antipsychotic medication by combining proton magnetic resonance spectroscopy (1H-MRS) with functional magnetic resonance imaging (fMRI). We used single voxel MRS acquired in the bilateral dorsal anterior cingulate cortex (ACC) and fMRI during performance of a Stroop color-naming task in 22 patients with schizophrenia (SZ), initially off-medication and after a 6-week course of risperidone, and 20 matched healthy controls (HC) twice, 6 weeks apart. We observed a significant decrease in ACC glutamate + glutamine (Glx)/Creatine (Cr) levels in medicated SZ patients compared to HC but not compared to their off-medication baseline. In off-medication SZ, the relationship between ACC Glx/Cr levels and the blood oxygen level-dependent (BOLD) response in regions of the salience network (SN) and posterior default mode network (DMN) was opposite than of HC. After 6 weeks, the relationship between Glx and the BOLD response was still opposite between the groups; however for both groups the direction of the relationship changed from baseline to week 6. These results suggest a mechanism whereby alterations in the relationship between cortical glutamate and BOLD response is disrupting the modulation of major neural networks subserving cognitive processes, potentially affecting cognition. While these relationships appear to normalize with treatment in patients, the interpretations of the results are confounded by significant group differences in Glx levels, as well as the variability of the relationship between Glx and BOLD response in HC over time, which may be driven by factors including habituation to task or scanner environment.
Collapse
Affiliation(s)
- Elyse J. Cadena
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - David M. White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Nina V. Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Meredith A. Reid
- Magnetic Resonance Imaging Research Center, Auburn University at Birmingham, Birmingham, AL, United States
| | - Jose O. Maximo
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Eric A. Nelson
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Brian A. Gawronski
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Adrienne C. Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, United States
| |
Collapse
|
14
|
Overbeek G, Gawne TJ, Reid MA, Salibi N, Kraguljac NV, White DM, Lahti AC. Relationship Between Cortical Excitation and Inhibition and Task-Induced Activation and Deactivation: A Combined Magnetic Resonance Spectroscopy and Functional Magnetic Resonance Imaging Study at 7T in First-Episode Psychosis. Biol Psychiatry Cogn Neurosci Neuroimaging 2018; 4:121-130. [PMID: 30470582 DOI: 10.1016/j.bpsc.2018.10.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 09/18/2018] [Accepted: 10/07/2018] [Indexed: 12/29/2022]
Abstract
BACKGROUND Schizophrenia is thought to be a disorder of brain dysconnectivity. An imbalance between cortical excitation/inhibition is also implicated, but the link between these abnormalities remains unclear. The present study used magnetic resonance spectroscopy and functional magnetic resonance imaging at 7T to investigate how measurements of glutamate and gamma-aminobutyric acid (GABA) relate to the blood oxygen level-dependent (BOLD) response during a cognitive task, and how these relationships are altered in schizophrenia. METHODS Usable functional magnetic resonance imaging data from 17 first-episode psychosis (FEP) patients (4 women, 13 men) and 21 matched healthy control subjects (HCs) (5 women, 16 men) were acquired during a Stroop task. Within- and between-group comparisons of the BOLD response were performed. Neurometabolite levels were measured in the dorsal anterior cingulate cortex. Two multiple regressions investigated how glutamate, glutamine, and GABA related to the BOLD response in HCs and FEP patients separately. A third investigated between-group differences in the relationships between the BOLD response and each of these neurometabolites. RESULTS Compared with HCs, FEP patients showed an increased BOLD response within regions of the executive and default mode networks. In FEP patients, the relationship between anterior cingulate cortex glutamate levels and the BOLD response in regions of the posterior default mode network was opposite to that of HCs. In FEP patients but not HCs, anterior cingulate cortex GABA levels correlated with the local BOLD response and with the Stroop reaction time. CONCLUSION These results suggest a mechanism whereby alterations in the relationship between cortical glutamate/GABA and BOLD response is disrupting the dynamic of major neural networks, possibly affecting cognition.
Collapse
Affiliation(s)
- Gregory Overbeek
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Timothy J Gawne
- Department of Vision Sciences, University of Alabama at Birmingham, Birmingham, Alabama
| | - Meredith A Reid
- Magnetic Resonance Imaging Research Center, Auburn University, Auburn, Alabama
| | - Nouha Salibi
- Siemens Healthineers MR R&D, Malvern, Pennsylvania
| | - Nina V Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - David M White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama.
| |
Collapse
|
15
|
|
16
|
Bannantine JP, Register KB, White DM. Application of the Biosafety RAM and eProtocol Software Programs to Streamline Institutional Biosafety Committee Processes at the USDA-National Animal Disease Center. Appl Biosaf 2018. [DOI: 10.1177/1535676018767904] [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: 11/15/2022]
Affiliation(s)
| | | | - David M. White
- USDA-Animal and Plant Health Inspection Service, Ames, IA, USA
| |
Collapse
|
17
|
|
18
|
Cadena EJ, White DM, Kraguljac NV, Reid MA, Lahti AC. Evaluation of fronto-striatal networks during cognitive control in unmedicated patients with schizophrenia and the effect of antipsychotic medication. NPJ Schizophr 2018; 4:8. [PMID: 29736018 PMCID: PMC5938238 DOI: 10.1038/s41537-018-0051-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 03/29/2018] [Accepted: 04/09/2018] [Indexed: 01/24/2023]
Abstract
To understand the mechanism of cognitive control dysfunction in schizophrenia, it is critical to characterize brain function without the confounding effect of medication. It is also important to establish the extent to which antipsychotic medication restores brain function and whether those changes are related to psychosis improvement. Twenty-two patients with schizophrenia, initially unmedicated and after a 6-week course of risperidone, and 20 healthy controls (HC) studied twice, 6 weeks apart, performed an fMRI task. We examined group and longitudinal differences in anterior cingulate cortex (ACC), striatum, and midbrain functional activity during performance of a Stroop color task as well as activity patterns associated with improvement in psychosis symptoms. Unmedicated patients showed reduced functional activity in the ACC, striatum, and midbrain compared to HC. Post hoc contrasts from significant group-by-time interactions indicated that, in patients, drug administration was associated with both activity increases and decreases. In unmedicated patients, greater baseline functional activity in the striatum and midbrain predicted subsequent better treatment response. Greater changes in functional activity in ACC and ventral putamen over the course of 6 weeks positively correlated with better treatment response. Unmedicated patients show reduced activity in brain networks pivotal for cognitive control and medication is associated with functional changes in these regions. These results suggest a mechanism by which antipsychotic medication has a beneficial effect on cognition. Our results also support the notion that treatment response is determined by a combination of the baseline pattern of brain function and by the pharmacological modulation of these regions.
Collapse
Affiliation(s)
- Elyse J Cadena
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
- Department of Psychology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - David M White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Nina V Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Meredith A Reid
- Magnetic Imaging Research Center, Auburn University, Auburn, AL, USA
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA.
| |
Collapse
|
19
|
Lottman KK, White DM, Kraguljac NV, Reid MA, Calhoun VD, Catao F, Lahti AC. Four-way multimodal fusion of 7 T imaging data using an mCCA+jICA model in first-episode schizophrenia. Hum Brain Mapp 2018; 39:1475-1488. [PMID: 29315951 DOI: 10.1002/hbm.23906] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 11/06/2017] [Accepted: 11/26/2017] [Indexed: 01/05/2023] Open
Abstract
Acquisition of multimodal brain imaging data for the same subject has become more common leading to a growing interest in determining the intermodal relationships between imaging modalities to further elucidate the pathophysiology of schizophrenia. Multimodal data have previously been individually analyzed and subsequently integrated; however, these analysis techniques lack the ability to examine true modality inter-relationships. The utilization of a multiset canonical correlation and joint independent component analysis (mCCA + jICA) model for data fusion allows shared or distinct abnormalities between modalities to be examined. In this study, first-episode schizophrenia patients (nSZ =19) and matched controls (nHC =21) completed a resting-state functional magnetic resonance imaging (fMRI) scan at 7 T. Grey matter (GM), white matter (WM), cerebrospinal fluid (CSF), and amplitude of low frequency fluctuation (ALFF) maps were used as features in a mCCA + jICA model. Results of the mCCA + jICA model indicated three joint group-discriminating components (GM-CSF, WM-ALFF, GM-ALFF) and two modality-unique group-discriminating components (GM, WM). The joint component findings are highlighted by GM basal ganglia, somatosensory, parietal lobe, and thalamus abnormalities associated with ventricular CSF volume; WM occipital and frontal lobe abnormalities associated with temporal lobe function; and GM frontal, temporal, parietal, and occipital lobe abnormalities associated with caudate function. These results support and extend major findings throughout the literature using independent single modality analyses. The multimodal fusion of 7 T data in this study provides a more comprehensive illustration of the relationships between underlying neuronal abnormalities associated with schizophrenia than examination of imaging data independently.
Collapse
Affiliation(s)
- Kristin K Lottman
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, Alabama
| | - David M White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Nina V Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Meredith A Reid
- Department of Electrical and Computer Engineering, MRI Research Center, Auburn University, Auburn, Alabama
| | - Vince D Calhoun
- The Mind Research Network, Albuquerque, New Mexico.,Department of Electrical and Computer Engineering, The University of New Mexico, Albuquerque, New Mexico
| | - Fabio Catao
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama
| |
Collapse
|
20
|
Nelson EA, White DM, Kraguljac NV, Lahti AC. Gyrification Connectomes in Unmedicated Patients With Schizophrenia and Following a Short Course of Antipsychotic Drug Treatment. Front Psychiatry 2018; 9:699. [PMID: 30618873 PMCID: PMC6306495 DOI: 10.3389/fpsyt.2018.00699] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 12/03/2018] [Indexed: 12/18/2022] Open
Abstract
Schizophrenia (SZ) is a d isease characterized by brain dysconnectivity and abnormal brain development. The study of cortical gyrification in schizophrenia may capture underlying alterations reflective of neurodevelopmental abnormalities more accurately than other imaging modalities. Graph-based connectomic approaches have been previously used in schizophrenia to study structural and functional brain covariance using a diversity of techniques. The goal of the present study was to evaluate morphological covariance using a measure of local gyrification index in patients with schizophrenia. The aims of this study were two-fold: (1) Evaluate the structural covariance of local gyrification index using graph theory measures of integration and segregation in unmedicated patients with schizophrenia compared to healthy controls and (2) investigate changes in these measures following a short antipsychotic drug (APD) treatment. Using a longitudinal prospective design, structural scans were obtained prior to treatment in 34 unmedicated patients with SZ and after 6 weeks of treatment with risperidone. To control for the effect of time, 23 matched healthy controls (HC) were also scanned twice, 6 weeks apart. The cortical surface of each structural image was reconstructed and local gyrification index values were computed using FreeSurfer. Local gyrification index values where then parcellated into atlas based regions and entered into a 68 × 68 correlation matrix to construct local gyrification index connectomes for each group at each time point. Longitudinal comparisons showed significant group by time interactions for measures of segregation (clustering, local efficiency) and modularity, but not for measures of integration (path length, global efficiency). Post-hoc tests showed increased clustering, local efficiency, and modularity connectomes in unmedicated patients with SZ at baseline compared to HC. Post-hoc tests did not show significant within group differences for HCs or patients with SZ. After 6 weeks of treatment, there were no significant differences between the groups on these measures. Abnormal cortical topography is detected in schizophrenia and is modified by short term APD treatment reflective of decreases in hyper-specialization in network connectivity. We speculate that changes in the structural organization of the brain is achieved through the neuroplastic effects that APDs have on brain tissue, thus promoting more efficient brain connections and, possibly, a therapeutic effect.
Collapse
Affiliation(s)
- Eric A Nelson
- Department of Psychology, University of Alabama at Birmingham, Birmingham, AL, United States
| | - David M White
- Department of Psychiatry, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Nina V Kraguljac
- Department of Psychiatry, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Adrienne C Lahti
- Department of Psychiatry, University of Alabama at Birmingham, Birmingham, AL, United States
| |
Collapse
|
21
|
Lottman KK, Kraguljac NV, White DM, Morgan CJ, Calhoun VD, Butt A, Lahti AC. Risperidone Effects on Brain Dynamic Connectivity-A Prospective Resting-State fMRI Study in Schizophrenia. Front Psychiatry 2017; 8:14. [PMID: 28220083 PMCID: PMC5292583 DOI: 10.3389/fpsyt.2017.00014] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 01/17/2017] [Indexed: 12/31/2022] Open
Abstract
Resting-state functional connectivity studies in schizophrenia evaluating average connectivity over the entire experiment have reported aberrant network integration, but findings are variable. Examining time-varying (dynamic) functional connectivity may help explain some inconsistencies. We assessed dynamic network connectivity using resting-state functional MRI in patients with schizophrenia, while unmedicated (n = 34), after 1 week (n = 29) and 6 weeks of treatment with risperidone (n = 24), as well as matched controls at baseline (n = 35) and after 6 weeks (n = 19). After identifying 41 independent components (ICs) comprising resting-state networks, sliding window analysis was performed on IC timecourses using an optimal window size validated with linear support vector machines. Windowed correlation matrices were then clustered into three discrete connectivity states (a relatively sparsely connected state, a relatively abundantly connected state, and an intermediately connected state). In unmedicated patients, static connectivity was increased between five pairs of ICs and decreased between two pairs of ICs when compared to controls, dynamic connectivity showed increased connectivity between the thalamus and somatomotor network in one of the three states. State statistics indicated that, in comparison to controls, unmedicated patients had shorter mean dwell times and fraction of time spent in the sparsely connected state, and longer dwell times and fraction of time spent in the intermediately connected state. Risperidone appeared to normalize mean dwell times after 6 weeks, but not fraction of time. Results suggest that static connectivity abnormalities in schizophrenia may partly be related to altered brain network temporal dynamics rather than consistent dysconnectivity within and between functional networks and demonstrate the importance of implementing complementary data analysis techniques.
Collapse
Affiliation(s)
- Kristin K Lottman
- Department of Biomedical Engineering, University of Alabama at Birmingham , Birmingham, AL , USA
| | - Nina V Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham , Birmingham, AL , USA
| | - David M White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham , Birmingham, AL , USA
| | - Charity J Morgan
- Department of Biostatistics, University of Alabama at Birmingham , Birmingham, AL , USA
| | - Vince D Calhoun
- The Mind Research Network, Albuquerque, NM, USA; Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, NM, USA
| | - Allison Butt
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham , Birmingham, AL , USA
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham , Birmingham, AL , USA
| |
Collapse
|
22
|
Abstract
Findings of a recent Illinois readership study are presented here with a discussion of their implications. Dr. Schramm is director of the Institute of Communications Research, University of Illinois. Dr. White, head of the Bradley University journalism department, will join the Boston University faculty this fall.
Collapse
|
23
|
Abstract
Fire in the operating theater is a rare but potentially fatal complication. We report igniting an intraperitoneal fire while preforming an exploratory laparotomy for perforated viscus. Fortunately, the patient suffered no injuries as a result.
Collapse
Affiliation(s)
- Oliver C Bellevue
- Department of General Surgery, Swedish Medical Center, Seattle, WA, USA,
| | - Bennett M Johnson
- Department of General Surgery, Swedish Medical Center, Seattle, WA, USA
| | - Andrew F Feczko
- Department of General Surgery, Swedish Medical Center, Seattle, WA, USA
| | - Daniel E Nadig
- Department of General Surgery, Pacific Medical Centers, Seattle, WA, USA
| | - David M White
- Department of General Surgery, Pacific Medical Centers, Seattle, WA, USA
| |
Collapse
|
24
|
Robert SM, Buckingham SC, Campbell SL, Robel S, Holt KT, Ogunrinu-Babarinde T, Warren PP, White DM, Reid MA, Eschbacher JM, Berens ME, Lahti AC, Nabors LB, Sontheimer H. SLC7A11 expression is associated with seizures and predicts poor survival in patients with malignant glioma. Sci Transl Med 2016; 7:289ra86. [PMID: 26019222 DOI: 10.1126/scitranslmed.aaa8103] [Citation(s) in RCA: 182] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Glioma is the most common malignant primary brain tumor. Its rapid growth is aided by tumor-mediated glutamate release, creating peritumoral excitotoxic cell death and vacating space for tumor expansion. Glioma glutamate release may also be responsible for seizures, which complicate the clinical course for many patients and are often the presenting symptom. A hypothesized glutamate release pathway is the cystine/glutamate transporter System xc (-) (SXC), responsible for the cellular synthesis of glutathione (GSH). However, the relationship of SXC-mediated glutamate release, seizures, and tumor growth remains unclear. Probing expression of SLC7A11/xCT, the catalytic subunit of SXC, in patient and mouse-propagated tissues, we found that ~50% of patient tumors have elevated SLC7A11 expression. Compared with tumors lacking this transporter, in vivo propagated and intracranially implanted SLC7A11-expressing tumors grew faster, produced pronounced peritumoral glutamate excitotoxicity, induced seizures, and shortened overall survival. In agreement with animal data, increased SLC7A11 expression predicted shorter patient survival according to genomic data in the REMBRANDT (National Institutes of Health Repository for Molecular Brain Neoplasia Data) database. In a clinical pilot study, we used magnetic resonance spectroscopy to determine SXC-mediated glutamate release by measuring acute changes in glutamate after administration of the U.S. Food and Drug Administration-approved SXC inhibitor, sulfasalazine (SAS). In nine glioma patients with biopsy-confirmed SXC expression, we found that expression positively correlates with glutamate release, which is acutely inhibited with oral SAS. These data suggest that SXC is the major pathway for glutamate release from gliomas and that SLC7A11 expression predicts accelerated growth and tumor-associated seizures.
Collapse
Affiliation(s)
- Stephanie M Robert
- Department of Neurobiology, Center for Glial Biology in Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Susan C Buckingham
- Department of Neurobiology, Center for Glial Biology in Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Susan L Campbell
- Department of Neurobiology, Center for Glial Biology in Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Stefanie Robel
- Department of Neurobiology, Center for Glial Biology in Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Kenneth T Holt
- Department of Neurobiology, Center for Glial Biology in Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Toyin Ogunrinu-Babarinde
- Department of Neurobiology, Center for Glial Biology in Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Paula P Warren
- Division of Neuro-oncology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - David M White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Meredith A Reid
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Jenny M Eschbacher
- Cancer and Cell Biology Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Michael E Berens
- Cancer and Cell Biology Division, Translational Genomics Research Institute (TGen), Phoenix, AZ 85004, USA
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Louis B Nabors
- Division of Neuro-oncology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Harald Sontheimer
- Department of Neurobiology, Center for Glial Biology in Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
| |
Collapse
|
25
|
Reid MA, White DM, Kraguljac NV, Lahti AC. A combined diffusion tensor imaging and magnetic resonance spectroscopy study of patients with schizophrenia. Schizophr Res 2016; 170:341-50. [PMID: 26718333 PMCID: PMC5982513 DOI: 10.1016/j.schres.2015.12.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 12/03/2015] [Accepted: 12/07/2015] [Indexed: 12/31/2022]
Abstract
Diffusion tensor imaging (DTI) studies in schizophrenia consistently show global reductions in fractional anisotropy (FA), a putative marker of white matter integrity. The cingulum bundle, which facilitates communication between the anterior cingulate cortex (ACC) and hippocampus, is frequently implicated in schizophrenia. Magnetic resonance spectroscopy (MRS) studies report metabolic abnormalities in the ACC and hippocampus of patients. Combining DTI and MRS offers exploration of the relationship between cortical neuronal biochemistry and the integrity of white matter tracts connecting specific cortical regions; however, few studies have attempted this in schizophrenia. Twenty-nine schizophrenia patients and twenty controls participated in this 3 T imaging study in which we used DTI and tract-based spatial statistics (TBSS) to assess white matter integrity and MRS to quantify metabolites in the ACC and hippocampus. We found FA reductions with overlapping radial diffusivity (RD) elevations in patients in multiple tracts, suggesting white matter abnormalities in schizophrenia are driven by loss of myelin integrity. In controls, we found significant negative correlations between hippocampal N-acetylaspartate/creatine and RD and axial diffusivity (AD) as well as a significant negative correlation between FA and ACC glutamate+glutamine/creatine in the hippocampal part of the cingulum bundle. It is possible that the extent of myelin damage could have resulted in the absence of DTI-MRS correlations in our patient group. In conclusion, we demonstrate the potential utility of a multi-modal neuroimaging approach to help further our understanding of the relationship between white matter microstructure and neurochemistry in distinct cortical regions connected by white matter tracts.
Collapse
Affiliation(s)
- Meredith A. Reid
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA,Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL, USA
| | - David M. White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Nina V. Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Adrienne C. Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA,To whom correspondence should be addressed: Adrienne C. Lahti, MD, Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, SC 501, 1720 2 Ave S, Birmingham, AL 35294-0017, USA, +1 205-996-6776, Fax: +1 205-975-4879,
| |
Collapse
|
26
|
White DM, Lewis CE, Kuhn JH. Emerging technologies and bio-threats. Ensuring National Biosecurity 2016. [PMCID: PMC7149968 DOI: 10.1016/b978-0-12-801885-9.00007-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Many Institutional Biosafety Committees have expanded their role beyond their original mission, described in the National Institutes of Health Guidelines for Research Involving Recombinant or Synthetic Nucleic Acid Molecules. The guidelines are derived from the 1975 Asilomar Conference on Recombinant DNA Molecules that convened to examine and address societal concerns surrounding the (then) newly emerging recombinant DNA technology. This chapter will focus on emerging biological agents and cutting-edge technologies that present challenges to evaluating and assessing the biohazard risks associated with research protocols. Highly specialized and/or cross-disciplinary knowledge may be required for committee members to be able to evaluate benefit versus risk for research proposals addressing emerging infectious agents or technologies. The importance of designing a process that will account for the full range of requirements to fulfill the societal expectations of safety, efficiency, and scientific progress is highlighted.
Collapse
|
27
|
Libero LE, Reid MA, White DM, Salibi N, Lahti AC, Kana RK. Biochemistry of the cingulate cortex in autism: An MR spectroscopy study. Autism Res 2015; 9:643-57. [PMID: 26526126 DOI: 10.1002/aur.1562] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 08/18/2015] [Indexed: 12/12/2022]
Abstract
Neuroimaging studies have uncovered structural and functional alterations in the cingulate cortex in individuals with autism spectrum disorders (ASD). Such abnormalities may underlie neurochemical imbalance. In order to characterize the neurochemical profile, the current study examined the concentration of brain metabolites in dorsal ACC (dACC) and posterior cingulate cortex (PCC) in high-functioning adults with ASD. Twenty high-functioning adults with ASD and 20 age-and-IQ-matched typically developing (TD) peers participated in this Proton magnetic resonance spectroscopy (1H-MRS) study. LCModel was used in analyzing the spectra to measure the levels of N-Acetyl aspartate (NAA), choline (Cho), creatine (Cr), and glutamate/glutamine (Glx) in dACC and PCC. Groups were compared using means for the ratio of each metabolite to their respective Cr levels as well as on absolute internal-water-referenced measures of each metabolite. There was a significant increase in Cho in PCC for ASD adults, with a marginal increase in dACC. A reduction in NAA/Cr in dACC was found in ASD participants, compared to their TD peers. No significant differences in Glx/Cr or Cho/Cr were found in dACC. There were no statistically significant group differences in the absolute concentration of NAA, Cr, Glx, or NAA/Cr, Cho/Cr, and Glx/Cr in the PCC. Differences in the metabolic properties of dACC compared to PCC were also found. Results of this study provide evidence for possible cellular and metabolic differences in the dACC and PCC in adults with ASD. This may suggest neuronal dysfunction in these regions and may contribute to the neuropathology of ASD. Autism Res 2016, 9: 643-657. © 2015 International Society for Autism Research, Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Lauren E Libero
- Department of Psychology, University of Alabama at Birmingham, Birmingham, Alabama
| | | | - David M White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Nouha Salibi
- MR R&D, Siemens Healthcare, Malvern, Pennsylvania
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Rajesh K Kana
- Department of Psychology, University of Alabama at Birmingham, Birmingham, Alabama
| |
Collapse
|
28
|
Hutcheson NL, Sreenivasan KR, Deshpande G, Reid MA, Hadley J, White DM, Ver Hoef L, Lahti AC. Effective connectivity during episodic memory retrieval in schizophrenia participants before and after antipsychotic medication. Hum Brain Mapp 2014; 36:1442-57. [PMID: 25504918 DOI: 10.1002/hbm.22714] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 11/07/2014] [Accepted: 12/01/2014] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Impairment in episodic memory is one of the most robust findings in schizophrenia. Disruptions of fronto-temporal functional connectivity that could explain some aspects of these deficits have been reported. Recent work has identified abnormal hippocampal function in unmedicated patients with schizophrenia (SZ), such as increased metabolism and glutamate content that are not always seen in medicated SZ. For these reasons, we hypothesized that altered fronto-temporal connectivity might originate from the hippocampus and might be partially restored by antipsychotic medication. METHODS Granger causality methods were used to evaluate the effective connectivity between frontal and temporal regions in 21 unmedicated SZ and 20 matched healthy controls (HC) during performance of an episodic memory retrieval task. In 16 SZ, effective connectivity between these regions was evaluated before and after 1-week of antipsychotic treatment. RESULTS In HC, significant effective connectivity originating from the right hippocampus to frontal regions was identified. Compared to HC, unmedicated SZ showed significant altered fronto-temporal effective connectivity, including reduced right hippocampal to right medial frontal connectivity. After 1-week of antipsychotic treatment, connectivity more closely resembled the patterns observed in HC, including increased effective connectivity from the right hippocampus to frontal regions. CONCLUSIONS These results support the notion that memory disruption in schizophrenia might originate from hippocampal dysfunction and that medication restores some aspects of fronto-temporal dysconnectivity. Patterns of fronto-temporal connectivity could provide valuable biomarkers to identify new treatments for the symptoms of schizophrenia, including memory deficits.
Collapse
Affiliation(s)
- Nathan L Hutcheson
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, Birmingham, Alabama
| | | | | | | | | | | | | | | |
Collapse
|
29
|
Wheelock MD, Reid MA, To H, White DM, Cropsey KL, Lahti AC. Open label smoking cessation with varenicline is associated with decreased glutamate levels and functional changes in anterior cingulate cortex: preliminary findings. Front Pharmacol 2014; 5:158. [PMID: 25071576 PMCID: PMC4085720 DOI: 10.3389/fphar.2014.00158] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Accepted: 06/18/2014] [Indexed: 01/21/2023] Open
Abstract
Rationale: Varenicline, the most effective single agent for smoking cessation, is a partial agonist at α4β2 nicotinic acetylcholine receptors. Increasing evidence implicates glutamate in the pathophysiology of addiction and one of the benefits of treatment for smoking cessation is the ability to regain cognitive control. Objective: To evaluate the effects of 12-week varenicline administration on glutamate levels in the dorsal anterior cingulate cortex (dACC) and functional changes within the cognitive control network. Methods: We used single-voxel proton magnetic resonance spectroscopy (1H-MRS) in the dACC and functional MRI (fMRI) during performance of a Stroop color-naming task before and after smoking cessation with varenicline in 11 healthy smokers (open label design). Using the dACC as a seed region, we evaluated functional connectivity changes using a psychophysiological interaction (PPI) analysis. Results: We observed a significant decrease in dACC glutamate + glutamine (Glx)/Cr levels as well as significant blood oxygen level-dependent signal (BOLD) decreases in the rostral ACC/medial orbitofrontal cortex and precuneus/posterior cingulate cortex. These BOLD changes are suggestive of alterations in default mode network (DMN) function and are further supported by the results of the PPI analysis that revealed changes in connectivity between the dACC and regions of the DMN. Baseline measures of nicotine dependence and craving positively correlated with baseline Glx/Cr levels. Conclusions: These results suggest possible mechanisms of action for varenicline such as reduction in Glx levels in dACC and shifts in BOLD connectivity between large scale brain networks. They also suggest a role for ACC Glx in the modulation of behavior. Due to the preliminary nature of this study (lack of control group and small sample size), future studies are needed to replicate these findings.
Collapse
Affiliation(s)
- Muriah D Wheelock
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham Birmingham, AL, USA ; Department of Psychology, Behavioral Neuroscience, The University of Alabama at Birmingham Birmingham, AL, USA
| | - Meredith A Reid
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham Birmingham, AL, USA ; Department of Biomedical Engineering, The University of Alabama at Birmingham Birmingham, AL, USA
| | - Harrison To
- Department of Biomedical Engineering, The University of Alabama at Birmingham Birmingham, AL, USA
| | - David M White
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham Birmingham, AL, USA
| | - Karen L Cropsey
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham Birmingham, AL, USA
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham Birmingham, AL, USA
| |
Collapse
|
30
|
Hadley JA, Nenert R, Kraguljac NV, Bolding MS, White DM, Skidmore FM, Visscher KM, Lahti AC. Ventral tegmental area/midbrain functional connectivity and response to antipsychotic medication in schizophrenia. Neuropsychopharmacology 2014; 39:1020-30. [PMID: 24165885 PMCID: PMC3924537 DOI: 10.1038/npp.2013.305] [Citation(s) in RCA: 127] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Revised: 10/18/2013] [Accepted: 10/21/2013] [Indexed: 01/31/2023]
Abstract
Medication management in schizophrenia is a lengthy process, as the lack of clinical response can only be confirmed after at least 4 weeks of antipsychotic treatment at a therapeutic dose. Thus, there is a clear need for the discovery of biomarkers that have the potential to accelerate the management of treatment. Using resting-state functional MRI, we examined the functional connectivity of the ventral tegmental area (VTA), the origin of the mesocorticolimbic dopamine projections, in 21 healthy controls and 21 unmedicated patients with schizophrenia at baseline (pre-treatment) and after 1 week of treatment with the antipsychotic drug risperidone (1-week post-treatment). Group-level functional connectivity maps were obtained and group differences in connectivity were assessed on the groups' participant-level functional connectivity maps. We also examined the relationship between pre-treatment/1-week post-treatment functional connectivity and treatment response. Compared with controls, patients exhibited significantly reduced pre-treatment VTA/midbrain connectivity to multiple cortical and subcortical regions, including the dorsal anterior cingulate cortex (dACC) and thalamus. After 1 week of treatment, VTA/midbrain connectivity to bilateral regions of the thalamus was re-established. Pre-treatment VTA/midbrain connectivity strength to dACC was positively correlated with good response to a 6-week course of risperidone, whereas pre-treatment VTA/midbrain connectivity strength to the default mode network was negatively correlated. Our findings suggest that VTA/midbrain resting-state connectivity may be a useful biomarker for the prediction of treatment response.
Collapse
Affiliation(s)
- Jennifer A Hadley
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Rodolphe Nenert
- Department of Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Nina V Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Mark S Bolding
- Department of Radiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - David M White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Frank M Skidmore
- Department of Neurology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Kristina M Visscher
- Department of Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA,Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, SC 501, 1530 3rd Ave South, Birmingham, AL 35294-0017, USA, Tel: +205 996 6776, Fax: +205 975 4879, E-mail:
| |
Collapse
|
31
|
Hutcheson NL, Clark DG, Bolding MS, White DM, Lahti AC. Basal ganglia volume in unmedicated patients with schizophrenia is associated with treatment response to antipsychotic medication. Psychiatry Res 2014; 221:6-12. [PMID: 24210948 PMCID: PMC3947916 DOI: 10.1016/j.pscychresns.2013.10.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Revised: 07/31/2013] [Accepted: 10/16/2013] [Indexed: 02/08/2023]
Abstract
We investigated the relationship between basal ganglia volume and treatment response to the atypical antipsychotic medication risperidone in unmedicated patients with schizophrenia. Basal ganglia volumes included the bilateral caudate, putamen, and pallidum and were measured using the Freesurfer automated segmentation pipeline in 23 subjects. Also, baseline symptom severity, duration of illness, age, gender, time off medication, and exposure to previous antipsychotic were measured. Treatment response was significantly correlated with all three regions of the bilateral basal ganglia (caudate, putamen, and pallidum), baseline symptom severity, duration of illness, and age but not gender, time off antipsychotic medication, or exposure to previous antipsychotic medication. The caudate volume was the basal ganglia region that demonstrated the strongest correlation with treatment response and was significantly negatively correlated with patient age. Caudate volume was not significantly correlated with any other measure. We demonstrated a novel finding that the caudate volume explains a significant amount of the variance in treatment response over the course of 6 weeks of risperidone pharmacotherapy even when controlling for baseline symptom severity and duration of illness.
Collapse
Affiliation(s)
- Nathan L. Hutcheson
- Department of Graduate Biomedical Sciences, Neuroscience, University of Alabama at Birmingham, Birmingham, AL, USA,Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - David G. Clark
- Department of Neurology, The University of Alabama at Birmingham, Birmingham, AL
| | - Mark S. Bolding
- Department of Neurology, The University of Alabama at Birmingham, Birmingham, AL,Department of Vision Sciences, The University of Alabama at Birmingham, Birmingham, AL. USA
| | - David M. White
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Adrienne C. Lahti
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, Birmingham, AL, USA,Corresponding author. Tel.: +1 205 996 6776; fax: +1 205 975 4879.
| |
Collapse
|
32
|
Abstract
IMPORTANCE Alterations in glutamatergic neurotransmission have been postulated to be a key pathophysiologic mechanism in schizophrenia. OBJECTIVE To evaluate hippocampal volumetric measures and neurometabolites in unmedicated patients with schizophrenia and the correlations between these markers. Our a priori hypothesis was that glutamate levels would negatively correlate with hippocampal volume in schizophrenia. DESIGN, SETTING, AND PARTICIPANTS Combined 3-T structural magnetic resonance imaging and single-voxel proton magnetic resonance spectroscopy study at the Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, of 27 unmedicated patients with schizophrenia and 27 healthy controls. MAIN OUTCOMES AND MEASURES Hippocampal volumetric measures and neurometabolites, and the correlations between volumetric measurements and neurometabolites. RESULTS Hippocampal volumetric deficits, increased ratios of hippocampal glutamate and glutamine to creatine (Glx/Cr), and a loss of correlation between hippocampal N-acetylaspartate (NAA)/Cr and Glx/Cr in patients with schizophrenia were found. Significant correlations between hippocampal volumetric measures and Glx/Cr were also found in patients with schizophrenia but not healthy controls. CONCLUSIONS AND RELEVANCE Our findings support the theory that alterations in hippocampal glutamate levels potentially account for structural deficits in the hippocampus observed in schizophrenia neuroimaging studies.
Collapse
Affiliation(s)
- Nina V Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham
| | - David M White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham
| | - Meredith A Reid
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham,Department of Biomedical Engineering, University of Alabama at Birmingham
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham
| |
Collapse
|
33
|
Zapata JC, Carrion R, Patterson JL, Crasta O, Zhang Y, Mani S, Jett M, Poonia B, Djavani M, White DM, Lukashevich IS, Salvato MS. Transcriptome analysis of human peripheral blood mononuclear cells exposed to Lassa virus and to the attenuated Mopeia/Lassa reassortant 29 (ML29), a vaccine candidate. PLoS Negl Trop Dis 2013; 7:e2406. [PMID: 24069471 PMCID: PMC3772037 DOI: 10.1371/journal.pntd.0002406] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Accepted: 07/24/2013] [Indexed: 12/22/2022] Open
Abstract
Lassa virus (LASV) is the causative agent of Lassa Fever and is responsible for several hundred thousand infections and thousands of deaths annually in West Africa. LASV and the non-pathogenic Mopeia virus (MOPV) are both rodent-borne African arenaviruses. A live attenuated reassortant of MOPV and LASV, designated ML29, protects rodents and primates from LASV challenge and appears to be more attenuated than MOPV. To gain better insight into LASV-induced pathology and mechanism of attenuation we performed gene expression profiling in human peripheral blood mononuclear cells (PBMC) exposed to LASV and the vaccine candidate ML29. PBMC from healthy human subjects were exposed to either LASV or ML29. Although most PBMC are non-permissive for virus replication, they remain susceptible to signal transduction by virus particles. Total RNA was extracted and global gene expression was evaluated during the first 24 hours using high-density microarrays. Results were validated using RT-PCR, flow cytometry and ELISA. LASV and ML29 elicited differential expression of interferon-stimulated genes (ISG), as well as genes involved in apoptosis, NF-kB signaling and the coagulation pathways. These genes could eventually serve as biomarkers to predict disease outcomes. The remarkable differential expression of thrombomodulin, a key regulator of inflammation and coagulation, suggests its involvement with vascular abnormalities and mortality in Lassa fever disease. The virulent Lassa fever virus (LASV) and the non-pathogenic Mopeia virus (MOPV) infect rodents and, incidentally, people in West Africa. The mechanism of LASV damage in human beings is unclear. There is no licensed Lassa fever vaccine and therapeutic intervention is usually too late. The ML29 vaccine candidate derived from Lassa and Mopeia viruses protects rodents and primates from Lassa fever disease. Peripheral blood mononuclear cells from healthy human subjects were exposed to either LASV or ML29 in order to identify early cellular responses that could be attributed to the difference in virulence between the two viruses. Differential expression of interferon-stimulated genes as well as coagulation-related genes could lead to an explanation for Lassa fever pathogenesis and indicate protective treatments for Lassa fever disease.
Collapse
Affiliation(s)
- Juan Carlos Zapata
- Institute of Human Virology, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Reid MA, Kraguljac NV, Avsar KB, White DM, den Hollander JA, Lahti AC. Proton magnetic resonance spectroscopy of the substantia nigra in schizophrenia. Schizophr Res 2013; 147:348-54. [PMID: 23706412 PMCID: PMC3760722 DOI: 10.1016/j.schres.2013.04.036] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 04/24/2013] [Accepted: 04/26/2013] [Indexed: 01/09/2023]
Abstract
BACKGROUND Converging evidence in schizophrenia points to disruption of the dopamine and glutamate neurotransmitter systems in the pathophysiology of the disorder. Dopamine is produced in the substantia nigra, but few neuroimaging studies have specifically targeted this structure. In fact, no studies of the substantia nigra in schizophrenia have used proton magnetic resonance spectroscopy (MRS). We sought to demonstrate the feasibility of acquiring single-voxel MRS measurements at 3T from the substantia nigra and to determine which metabolites could be reliably quantified in schizophrenia patients and healthy controls. METHODS We used a turbo spin echo sequence with magnetization transfer contrast to visualize the substantia nigra and single-voxel proton MRS to quantify levels of N-acetylaspartate, glutamate and glutamine (Glx), and choline in the left substantia nigra of 35 people with schizophrenia and 22 healthy controls. RESULTS We obtained spectra from the substantia nigra and quantified neurometabolites in both groups. We found no differences in levels of N-acetylaspartate/creatine, Glx/creatine, or choline/creatine between the groups. We found a significant correlation between Glx/creatine and overall cognitive performance, measured with the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS), in controls but not patients, a difference that was statistically significant. CONCLUSIONS Our study demonstrates the feasibility of obtaining single-voxel MRS data from the substantia nigra in schizophrenia. Such measurements may prove useful in understanding the biochemistry underlying cellular function in a region implicated in the pathophysiology of schizophrenia.
Collapse
Affiliation(s)
- Meredith A. Reid
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA,Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Nina V. Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Kathy B. Avsar
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA,Department of Psychology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - David M. White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | | | - Adrienne C. Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA,To whom correspondence should be addressed: Adrienne C. Lahti, MD, Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, SC 501, 1720 2nd Ave S, Birmingham, AL 35294-0017, +1 205-996-6776, Fax: +1 205-975-4879,
| |
Collapse
|
35
|
Affiliation(s)
- David M. White
- a Department of Health, Physical Education, Recreation, and Safety , East Carolina University , Greenville , NC , 27858–4353 , USA
| | - W. Michael Felts
- a Department of Health, Physical Education, Recreation, and Safety , East Carolina University , Greenville , NC , 27858–4353 , USA
| |
Collapse
|
36
|
Affiliation(s)
- David M. White
- a The Department of Health, Physical Education, Recreation and Safety , East Carolina University , Greenville , NC , 27858-4353 , USA
| | - Danny J. Ballard
- b The Department of Health and Kinesiology , Texas A & M University , College Station , TX , 77849 , USA
| |
Collapse
|
37
|
Affiliation(s)
- Elbert D. Glover
- a College of Health and Human Development , The Pennsylvania State University , State College , PA , 16802 , USA
| | | | - David M. White
- c East Carolina University, Department of HPERS , Greenville , NC , 27858-4353 , USA
| |
Collapse
|
38
|
Bolding MS, Reid MA, Avsar KB, Roberts RC, Gamlin PD, Gawne TJ, White DM, den Hollander JA, Lahti AC. Magnetic transfer contrast accurately localizes substantia nigra confirmed by histology. Biol Psychiatry 2013; 73:289-94. [PMID: 22981657 PMCID: PMC3534824 DOI: 10.1016/j.biopsych.2012.07.035] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 06/13/2012] [Accepted: 07/30/2012] [Indexed: 11/24/2022]
Abstract
BACKGROUND Magnetic resonance imaging (MRI) has multiple contrast mechanisms. Like various staining techniques in histology, each contrast type reveals different information about the structure of the brain. However, it is not always clear how structures visible in MRI correspond to structures previously identified by histology. The purpose of this study was to determine if magnetic transfer contrast (MTC) or T2 contrast MRI was better at delineating the substantia nigra (SN). METHODS MRI scans were acquired in vivo from two nonhuman primates (NHPs). The NHPs were subsequently euthanized, perfused, and their brains sectioned for histologic analyses. Each slice was photographed before sectioning. Each brain was sectioned into approximately 500 sections, 40 μm each, encompassing most of the cortex, midbrain, and dorsal parts of the hindbrain. Levels corresponding to anatomic MRI images were selected. From these, adjacent sections were stained using Kluver-Barrera (myelin and cell bodies) or tyrosine hydroxylase (dopaminergic neurons) immunohistochemistry. The resulting images were coregistered to the block-face images using a moving least squares algorithm with similarity transformations. MR images were similarly coregistered to the block-face images, allowing the structures on MRI to be identified with structures on the histologic images. RESULTS We found that hyperintense (light) areas in MTC images were coextensive with the SN as delineated histologically. The hypointense (dark) areas in T2-weighted images were not coextensive with the SN but extended partially into the SN and partially into the cerebral peduncles. CONCLUSIONS MTC is more accurate than T2-weighting for localizing the SN in vivo.
Collapse
Affiliation(s)
| | | | | | | | - Paul D. Gamlin
- Vision Sciences, University of Alabama at Birmingham (UAB)
| | | | | | | | - Adrienne C. Lahti
- Psychiatry and Behavioral Neurobiology, UAB
,Corresponding author. Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, SC 501, 1530 3rd Avenue South, Birmingham, AL 35294-0017, United States. Tel.: +1 205 996 6776; fax: +1 205 975 4879.
| |
Collapse
|
39
|
Abstract
Proton magnetic resonance spectroscopy (¹H-MRS) allows the non-invasive measurement of several metabolites, including N-acetyl-aspartate (NAA), an amino acid exclusively synthesized in the mitochondria of neurons, and glutamate, an amino acid involved in excitatory neurotransmission and metabolism. In view of recent postmortem studies in schizophrenia (SZ) revealing mitochondrial abnormalities as well as perturbed expression of the enzymes regulating the glutamate-glutamine cycle, we hypothesized that a disruption in the homeostasis of NAA and glutamate in SZ is present. Fifty subjects with SZ and 48 matched healthy controls (HC) were enrolled in this ¹H-MRS study. Voxels were placed in the anterior cingulate cortex (ACC) and hippocampus; NAA/Cr and glutamate + glutamine (Glx)/Cr ratios were obtained. We did not find any significant differences between the groups in metabolite levels in both the ACC and hippocampus. In the hippocampus we found that NAA/Cr and Glx/Cr ratios were significantly correlated in HC (r=0.40, p<0.01 (corrected p=0.048)) but not in SZ (r=-0.06; p=0.71), a difference that was statistically significant (z=2.22, p=0.02). Although no differences in neurometabolites between SZ and HC were apparent, correlations between NAA/Cr and Glx/Cr in healthy subjects in the hippocampus were found, and this correlation was lost in subjects with SZ. To our knowledge, this is the first study to suggest decoupling of these metabolites, a pathophysiological change that may be unique to SZ. However, these results warrant replication and further exploration before definite conclusions can be drawn.
Collapse
Affiliation(s)
- Nina V Kraguljac
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Meredith A Reid
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA,Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL, USA
| | - David M White
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Jan den Hollander
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Adrienne C Lahti
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, USA,Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, SC 501, 1530 3rd Avenue S, Birmingham, AL 35294-0017, USA, Tel: +205 996 6776, Fax: +205 975 4879, E-mail:
| |
Collapse
|
40
|
Bolding MS, White DM, Hadley JA, Weiler M, Holcomb HH, Lahti AC. Antipsychotic Drugs Alter Functional Connectivity between the Medial Frontal Cortex, Hippocampus, and Nucleus Accumbens as Measured by H215O PET. Front Psychiatry 2012; 3:105. [PMID: 23230425 PMCID: PMC3515723 DOI: 10.3389/fpsyt.2012.00105] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Accepted: 11/19/2012] [Indexed: 11/23/2022] Open
Abstract
To evaluate changes in functional connectivity as a result of treatment with antipsychotic drugs (APDs) in subjects with schizophrenia (SZ), we identified a limited number of regions that have been implicated in the mechanism of action of APDs and that are part of a neuronal network known to be modulated by dopamine (DA). These regions consisted of the nucleus accumbens (NAcc), the hippocampus (Hip), and the medial frontal cortex (MFC). SZ participants were blindly randomized into a haloperidol treatment group (n = 12) and an olanzapine treatment group (n = 17). Using PET with 15O, we evaluated changes in functional connectivity between these regions during rest and task performance at three treatment time points: (1) at baseline, after withdrawal of all psychotropic medication (2 weeks), (2) after 1 week on medication, and (3) after 6 weeks on medication. Results from the two treatment groups were combined during analysis to investigate the common effects of APDs on functional connectivity. We found that the functional connectivity between MFC and NAcc significantly increased at week one, and then significantly decreased from week one to week 6. The functional connectivity between MFC and Hip significantly decreased at week one and week 6 relative to baseline. Critically, the strength of the functional connectivity between the MFC and Hip after 1 week of treatment was predictive of treatment response. This pattern of changes may represent an important biomarker for indexing treatment response. The regulation by APDs of the balance between prefrontal and limbic inputs to the striatum may be crucial to restoring adaptive behavior.
Collapse
Affiliation(s)
- Mark S Bolding
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham Birmingham, AL, USA ; Department of Vision Sciences, The University of Alabama at Birmingham Birmingham, AL, USA
| | | | | | | | | | | |
Collapse
|
41
|
Mitchell HM, White DM, Domowicz MS, Kraig RP. Cold pre-conditioning neuroprotection depends on TNF-α and is enhanced by blockade of interleukin-11. J Neurochem 2010; 117:187-96. [PMID: 21070241 DOI: 10.1111/j.1471-4159.2010.07103.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Cold pre-conditioning reduces subsequent brain injury in small animals but the underlying mechanisms remain undefined. As hypothermia triggers systemic macrophage tumor necrosis factor alpha (TNF-α) production and other neural pre-conditioning stimuli depend on this cytokine, we reasoned that microglia and TNF-α would be similarly involved with cold pre-conditioning neuroprotection. Also, as slice cultures closely approximate their in vivo counterpart and include quiescent microglia, we used rat hippocampal slice cultures to confirm this hypothesis. Furthermore, inflammatory cytokine gene screening with subsequent PCR and immunostaining confirmation of targeted mRNA and related protein changes showed that cold pre-conditioning triggered a significant rise in TNF-α that localized to microglia and a significant rise in interleukin (IL)-11 that localized mainly to hippocampal pyramidal neurons and, more rarely, astrocytes. Importantly, co-stimulation with cold and IL-11, an anti-inflammatory cytokine that inhibits TNF-α expression, abrogated the otherwise evident protection. Instead, cold pre-conditioning coupled with blockade of IL-11 signaling further enhanced neuroprotection from that seen with cold pre-conditioning alone. Thus, physiological activation of brain pro-inflammatory cytokine signaling, and its amplification by inhibition of coincident anti-inflammatory cytokine signaling, may be opportune targets for the development of novel therapeutics that can mimic the protection seen in cold pre-conditioning.
Collapse
Affiliation(s)
- Heidi M Mitchell
- Department of Neurology, The University of Chicago Medical Center, Chicago, Illinois 60637, USA
| | | | | | | |
Collapse
|
42
|
Reid MA, Stoeckel LE, White DM, Avsar KB, Bolding MS, Akella NS, Knowlton RC, Hollander JAD, Lahti AC. Assessments of function and biochemistry of the anterior cingulate cortex in schizophrenia. Biol Psychiatry 2010; 68:625-33. [PMID: 20570244 PMCID: PMC2953853 DOI: 10.1016/j.biopsych.2010.04.013] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2010] [Revised: 03/24/2010] [Accepted: 04/13/2010] [Indexed: 12/30/2022]
Abstract
BACKGROUND Neuroimaging and electrophysiologic studies have consistently provided evidence of impairment in anterior cingulate cortex/medial frontal cortex function in people with schizophrenia. In this study, we sought to clarify the nature of this abnormality by combining proton magnetic resonance spectroscopy (1H-MRS) with functional magnetic resonance imaging (fMRI) at 3T. METHODS We used single-voxel MRS acquired in the dorsal anterior cingulate cortex and fMRI during performance of a Stroop color-naming task to investigate the neurochemistry and functional response of the anterior cingulate cortex/medial frontal cortex in 26 stable, medicated subjects with schizophrenia and 23 matched healthy control subjects. RESULTS In schizophrenia subjects, we found decreased blood oxygen level-dependent signal in the medial frontal wall, with significant clusters restricted to more dorsal regions compared with healthy subjects. In addition, we observed a trend-level decrease in N-acetylaspartate/creatine (NAA/Cr) levels and a significant positive correlation between NAA/Cr level and the blood oxygen level-dependent signal in schizophrenia subjects that did not exist in healthy subjects. Furthermore, in this group of medicated subjects, we did not find evidence of decreased glutamate + glutamine(Glx)/Cr levels, but there was a significant negative correlation between Glx/Cr levels and negative symptoms. CONCLUSIONS Our results suggest that abnormal NAA levels, which may reflect a neuronal dysfunction related to schizophrenia, affect neuronal physiology, as evidenced by reduced blood oxygen level-dependent response.
Collapse
Affiliation(s)
- Meredith A. Reid
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, Birmingham, AL, Department of Biomedical Engineering, The University of Alabama at Birmingham, Birmingham, AL
| | - Luke E. Stoeckel
- Department of Psychiatry, Massachusetts General Hospital, Boston, MA
| | - David M. White
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, Birmingham, AL
| | - Kathy B. Avsar
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, Birmingham, AL, Department of Psychology, The University of Alabama at Birmingham, Birmingham, AL
| | - Mark S. Bolding
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, Birmingham, AL, Department of Vision Sciences, The University of Alabama at Birmingham, Birmingham, AL
| | | | - Robert C. Knowlton
- Department of Neurology, The University of Alabama at Birmingham, Birmingham, AL
| | | | - Adrienne C. Lahti
- Department of Psychiatry and Behavioral Neurobiology, The University of Alabama at Birmingham, Birmingham, AL
| |
Collapse
|
43
|
Abstract
Neurological injury is a frequent cause of morbidity and mortality from general anesthesia and related surgical procedures that could be alleviated by development of effective, easy to administer and safe preconditioning treatments. We seek to define the neural immune signaling responsible for cold-preconditioning as means to identify novel targets for therapeutics development to protect brain before injury onset. Low-level pro-inflammatory mediator signaling changes over time are essential for cold-preconditioning neuroprotection. This signaling is consistent with the basic tenets of physiological conditioning hormesis, which require that irritative stimuli reach a threshold magnitude with sufficient time for adaptation to the stimuli for protection to become evident. Accordingly, delineation of the immune signaling involved in cold-preconditioning neuroprotection requires that biological systems and experimental manipulations plus technical capacities are highly reproducible and sensitive. Our approach is to use hippocampal slice cultures as an in vitro model that closely reflects their in vivo counterparts with multi-synaptic neural networks influenced by mature and quiescent macroglia/microglia. This glial state is particularly important for microglia since they are the principal source of cytokines, which are operative in the femtomolar range. Also, slice cultures can be maintained in vitro for several weeks, which is sufficient time to evoke activating stimuli and assess adaptive responses. Finally, environmental conditions can be accurately controlled using slice cultures so that cytokine signaling of cold-preconditioning can be measured, mimicked, and modulated to dissect the critical node aspects. Cytokine signaling system analyses require the use of sensitive and reproducible multiplexed techniques. We use quantitative PCR for TNF-α to screen for microglial activation followed by quantitative real-time qPCR array screening to assess tissue-wide cytokine changes. The latter is a most sensitive and reproducible means to measure multiple cytokine system signaling changes simultaneously. Significant changes are confirmed with targeted qPCR and then protein detection. We probe for tissue-based cytokine protein changes using multiplexed microsphere flow cytometric assays using Luminex technology. Cell-specific cytokine production is determined with double-label immunohistochemistry. Taken together, this brain tissue preparation and style of use, coupled to the suggested investigative strategies, may be an optimal approach for identifying potential targets for the development of novel therapeutics that could mimic the advantages of cold-preconditioning.
Collapse
Affiliation(s)
- Heidi M Mitchell
- Department of Neurology, The University of Chicago Medical Center, USA
| | | | | |
Collapse
|
44
|
Kraig RP, Mitchell HM, Christie-Pope B, Kunkler PE, White DM, Tang YP, Langan G. TNF-α and Microglial Hormetic Involvement in Neurological Health & Migraine. Dose Response 2010; 8:389-413. [PMID: 21191481 DOI: 10.2203/dose-response.09-056.kraig] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [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: 11/03/2022] Open
Abstract
Environmental enrichment, i.e., increased intellectual, social, and physical activity makes brain more resilient to subsequent neurological disease. The mechanisms for this effect remain incompletely defined, but evidence shows tumor necrosis factor-alpha (TNF-α) is involved. TNF-α, at acutely high levels, possesses the intrinsic capacity to enhance injury associated with neurological disease. Conversely, the effect of TNF-α at low-levels is nutritive over time, consistent with physiological conditioning hormesis. Evidence shows that neural activity triggers low-level pro-inflammatory signaling involving TNF-α. This low-level TNF-α signaling alters gene expression, resulting in an enhanced resilience to disease. Brain-immune signaling may become maladaptive when increased activity is chronic without sufficient periods of reduced activity necessary for nutritive adaptation. Such tonically increased activity may explain, for example, the transformation of episodic to chronic migraine with related increased susceptibility to spreading depression, the most likely underlying cause of this malady. Thus, TNF-α, whose function is to alter gene expression, and its principal cellular source, microglia, seem powerfully positioned to orchestrate hormetic immune signaling that establishes the phenotype of neurological health and disease from brain activity.
Collapse
Affiliation(s)
- Richard P Kraig
- Department of Neurology, The University of Chicago Medical Center, Chicago, IL
| | | | | | | | | | | | | |
Collapse
|
45
|
Jensen MA, Yanowitch RN, Reder AT, White DM, Arnason BGW. Immunoglobulin-like transcript 3, an inhibitor of T cell activation, is reduced on blood monocytes during multiple sclerosis relapses and is induced by interferon beta-1b. Mult Scler 2009; 16:30-8. [PMID: 20007427 DOI: 10.1177/1352458509352794] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Immunoglobulin-like transcripts (ILTs) are immunoregulatory proteins that either activate or inhibit immune responses. ILT3 is inhibitory and is expressed preferentially by antigen-presenting cells. When its extracellular domain binds to an unidentified ligand of activated T cells, the T cell is silenced. Our objective was to study the expression of ILT3 on circulating monocytes in RRMS. Freshly isolated peripheral blood mononuclear cells were analyzed by multicolored flow cytometry. The proportion of ILT3(+)CD14(+) monocytes in blood, and ILT3 levels expressed by them, is lower in untreated multiple sclerosis in relapse than in: (1) untreated multiple sclerosis in remission (p < 0.009); (2) stable interferon beta-treated relapsing-remitting multiple sclerosis (p < 0.001) and; (3) healthy controls (p < 0.009). Glatiramer acetate-stimulated CD4( +) T cells, co-cultured with freshly isolated monocytes, proliferate significantly better (p = 0.0017 for multiple sclerosis; p = 0.0015 for controls) when T cell interaction with monocyte-expressed ILT3 is blocked by anti-ILT3 antibody. Interferon beta is beneficial in multiple sclerosis; why so remains unclear. Interferon beta-1b markedly increases ILT3 expression in vitro by monocytes from multiple sclerosis patients and controls. These findings identify a putative novel mechanism for the therapeutic benefit bestowed by Interferon beta and a new target for therapeutic intervention in relapsing-remitting multiple sclerosis.
Collapse
Affiliation(s)
- Mark A Jensen
- Department of Neurology, The University of Chicago, Chicago, IL 60637, USA.
| | | | | | | | | |
Collapse
|
46
|
Bolding MS, Koontz TB, White DM, Lahti AC. Functional effects of olanzapine over a 6-week treatment period: differential effects in good and poor responders. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)71339-4] [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] Open
|
47
|
Abstract
Generating efficient antibody (Ab) responses against weak antigens remains challenging. Ab responses require antigen (Ag) uptake by antigen-presenting cells (APC), followed by presentation of processed Ag to T cells. Limited uptake of antigenic peptides by APC constrains Ab responses. Here we improve vaccine efficacy by targeting Ag to Fcgamma receptors (FcgammaR) using R4, a recombinant FcgammaR ligand. R4 has four repeats per chain of the hinge region and CH2 domain (HCH2) of human IgG1. HCH2 encompasses the FcgammaR binding site. The repeats are linked to the human IgG1 framework. To test R4 in augmenting Ag uptake, we expressed human serum albumin domain 1 (HSA1) at the N terminus of R4 to produce HSA1R4. HSA1R4 (50 microg) administered to mice in Ribi adjuvant induces up to 1100-fold higher HSA1-specific IgG titers than HSA1 (p<0.001). HSA1R4 (250 ng) induces up to 130 times more anti-HSA1 Ab than HSA1Fc, a protein with HSA1 linked to the IgG1 framework (p<0.001). HSA-reactive T cells proliferate more briskly to HSA1R4 than to HSA1Fc (p<0.008). Immunization with HSA1R4 yields greater T cell reactivity to HSA1 ex vivo than immunization with HSA1Fc (p<0.004). Linking antigenic peptides to linear HCH2 polymers may facilitate vaccine development.
Collapse
Affiliation(s)
- Mark A Jensen
- Department of Neurology, University of Chicago, Chicago, IL 60637, USA.
| | | | | |
Collapse
|
48
|
Alm AM, Gao T, White DM. Pervasive patient tracking for mass casualty incident response. AMIA Annu Symp Proc 2006; 2006:842. [PMID: 17238462 PMCID: PMC1839350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Transportation officers at mass casualty incidents are faced with the daunting task of tracking large amounts of patients as they leave the disaster scene. Patients often leave under their own power without notifying any authorities, presenting a problem for personnel attempting to account for every patient they have treated. This paper describes a system of tracking patients at a disaster scene or en route to hospitals using electronic triage tags registered with an external database.
Collapse
Affiliation(s)
- Alexander M Alm
- Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
| | | | | |
Collapse
|
49
|
White DM, Blair CD, Beaty BJ. Molecular epidemiology of Bluetongue virus in northern Colorado. Virus Res 2005; 118:39-45. [PMID: 16337708 DOI: 10.1016/j.virusres.2005.11.008] [Citation(s) in RCA: 12] [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] [Received: 05/19/2005] [Revised: 11/10/2005] [Accepted: 11/10/2005] [Indexed: 11/16/2022]
Abstract
The molecular epidemiology of Bluetongue virus serotype 11 (BTV11) in an enzootic focus in northern Colorado was investigated. Viruses isolated up to 12 years apart, from both vertebrate and invertebrate hosts, were compared by phylogenetic analysis of nucleotide sequence data from three genome segments: L2, S7, and S10. For each segment, viruses isolated from ruminants in the 1980s were more similar to one another than to viruses isolated from Culicoides spp. insects in the 1990s. Nearly identical BTV11-L2 segments were found in all isolates, but over time they were associated with different S7 and S10 genome segments. Therefore, L2-segment-based serologic identification of BTV isolates underestimates the origin and natural evolution of the viruses. In addition, the use of one or even two genome segments is inadequate to define the molecular epidemiology of the viruses in an enzootic focus. This information could influence import/export regulations based on BTV epidemiology in enzootic areas, as well as our view of the natural biology of the viruses.
Collapse
Affiliation(s)
- David M White
- USDA, ARS, Arthropod-borne Animal Diseases Research Laboratory, P.O. Box 3965, Laramie, WY 82071, USA.
| | | | | |
Collapse
|
50
|
Abstract
Bluetongue viruses (BTVs) are economically important arboviruses that affect sheep and cattle. The overwintering mechanism of BTVs in temperate climates has eluded researchers for many years. Many arboviruses overwinter in their invertebrate vectors. To test the hypothesis that BTVs overwinter in their vertically infected insect vectors, Culicoides sonorensis larvae were collected from long-term study sites in northern Colorado, USA, and assayed for the presence of BTV RNA by nested RT-PCR. Sequences from BTV RNA segment 7 were detected in 30 % (17/56) of pools composed of larvae and pupae collected in 1998 and in 10 % (31/319) of pools composed of adults reared from larvae collected in 1996. BTV was not isolated from the insects. Additionally, Culicoides cell-culture lines derived from material collected at one of the sites, or derived from insect samples collected during a BTV outbreak, contained BTV RNA segment 7. In contrast, segment 2 RNA was detected at half the rate of segment 7 RNA in the field-collected larvae and was only detected in the Culicoides cell lines with one of two primer sets. These data suggest that BTVs could overwinter in the insect vector and that there is reduced expression of the outer capsid genes during persistent infection.
Collapse
Affiliation(s)
- David M White
- USDA, ARS, Arthropod-borne Animal Diseases Research Laboratory, Dept 3354, 1000 E. University Avenue, Laramie, WY 82071, USA
| | - William C Wilson
- USDA, ARS, Arthropod-borne Animal Diseases Research Laboratory, Dept 3354, 1000 E. University Avenue, Laramie, WY 82071, USA
| | - Carol D Blair
- Arthropod-borne and Infectious Diseases Laboratory, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523, USA
| | - Barry J Beaty
- Arthropod-borne and Infectious Diseases Laboratory, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523, USA
| |
Collapse
|