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Olsen T, Koroni C, Liu Y, Russell JA, Wharry JP, Xiong H. Radiation effects on materials for electrochemical energy storage systems. Phys Chem Chem Phys 2023; 25:30761-30784. [PMID: 37830239 DOI: 10.1039/d3cp02697c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2023]
Abstract
Batteries and electrochemical capacitors (ECs) are of critical importance for applications such as electric vehicles, electric grids, and mobile devices. However, the performance of existing battery and EC technologies falls short of meeting the requirements of high energy/high power and long durability for increasing markets such as the automotive industry, aerospace, and grid-storage utilizing renewable energies. Therefore, improving energy storage materials performance metrics is imperative. In the past two decades, radiation has emerged as a new means to modify functionalities in energy storage materials. There exists a common misconception that radiation with energetic ions and electrons will always cause radiation damage to target materials, which might potentially prevent its applications in electrochemical energy storage systems. But in this review, we summarize recent progress in radiation effects on materials for electrochemical energy storage systems to show that radiation can have both beneficial and detrimental effects on various types of energy materials. Prior work suggests that fundamental understanding toward the energy loss mechanisms that govern the resulting microstructure, defect generation, interfacial properties, mechanical properties, and eventual electrochemical properties is critical. We discuss radiation effects in the following categories: (1) defect engineering, (2) interface engineering, (3) radiation-induced degradation, and (4) radiation-assisted synthesis. We analyze the significant trends and provide our perspectives and outlook on current research and future directions in research seeking to harness radiation as a method for enhancing the synthesis and performance of battery materials.
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Affiliation(s)
- Tristan Olsen
- Micron School of Materials Science & Engineering, Boise State University, Boise, Idaho, USA.
| | - Cyrus Koroni
- Micron School of Materials Science & Engineering, Boise State University, Boise, Idaho, USA.
| | - Yuzi Liu
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, IL, USA
| | - Joshua A Russell
- Micron School of Materials Science & Engineering, Boise State University, Boise, Idaho, USA.
| | - Janelle P Wharry
- School of Materials Engineering, Purdue University, West Lafayette, Indiana, USA.
| | - Hui Xiong
- Micron School of Materials Science & Engineering, Boise State University, Boise, Idaho, USA.
- Center for Advanced Energy Studies, Idaho Falls, Idaho 83401, USA
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Tao L, Russell JA, Xia D, Ma B, Hwang S, Yang Z, Hu A, Zhang Y, Sittisomwong P, Yu D, Deck PA, Madsen LA, Huang H, Xiong H, Bai P, Xu K, Lin F. Reversible Switch in Charge Storage Enabled by Selective Ion Transport in Solid Electrolyte Interphase. J Am Chem Soc 2023. [PMID: 37466049 DOI: 10.1021/jacs.3c03429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
Solid-electrolyte interphases (SEIs) in advanced rechargeable batteries ensure reversible electrode reactions at extreme potentials beyond the thermodynamic stability limits of electrolytes by insulating electrons while allowing the transport of working ions. Such selective ion transport occurs naturally in biological cell membranes as a ubiquitous prerequisite of many life processes and a foundation of biodiversity. In addition, cell membranes can selectively open and close the ion channels in response to external stimuli (e.g., electrical, chemical, mechanical, and thermal), giving rise to "gating" mechanisms that help manage intracellular reactions. We wondered whether the chemistry and structure of SEIs can mimic those of cell membranes, such that ion gating can be replicated. That is, can SEIs realize a reversible switching between two electrochemical behaviors, i.e., the ion intercalation chemistry of batteries and the ion adsorption of capacitors? Herein, we report such SEIs that result in thermally activated selective ion transport. The function of open/close gate switches is governed by the chemical and structural dynamics of SEIs under different thermal conditions, with precise behaviors as conducting and insulating interphases that enable battery and capacitive processes within a finite temperature window. Such an ion gating function is synergistically contributed by Arrhenius-activated ion transport and SEI dissolution/regrowth. Following the understanding of this new mechanism, we then develop an electrochemical method to heal the SEI layer in situ. The knowledge acquired in this work reveals the possibility of hitherto unknown biomimetic properties of SEIs, which will guide us to leverage such complexities to design better SEIs for future battery chemistries.
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Affiliation(s)
- Lei Tao
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Joshua A Russell
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Dawei Xia
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Bingyuan Ma
- Department of Energy, Environment & Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Sooyeon Hwang
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Zhijie Yang
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Anyang Hu
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Yuxin Zhang
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Poom Sittisomwong
- Department of Energy, Environment & Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Deyang Yu
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Paul A Deck
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
- Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Louis A Madsen
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
- Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Haibo Huang
- Department of Food Science and Technology, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Hui Xiong
- Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
- Center for Advanced Energy Studies, Idaho Falls, Idaho 83401, United States
| | - Peng Bai
- Department of Energy, Environment & Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Kang Xu
- Battery Science Branch, US Army Research Laboratory, Adelphi, Maryland 20783, United States
| | - Feng Lin
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
- Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
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Zhu H, Russell JA, Fang Z, Barnes P, Li L, Efaw C, Muenzer A, May J, Hamal K, Cheng IF, Davis PH, Dufek E, Xiong H. A Comparison of Solid Electrolyte Interphase Formation and Evolution on Highly Oriented Pyrolytic and Disordered Graphite Negative Electrodes in Lithium-Ion Batteries. Small 2021; 17:e2105292. [PMID: 34716757 DOI: 10.1002/smll.202105292] [Citation(s) in RCA: 5] [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] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/28/2021] [Indexed: 06/13/2023]
Abstract
The presence and stability of solid electrolyte interphase (SEI) on graphitic electrodes is vital to the performance of lithium-ion batteries (LIBs). However, the formation and evolution of SEI remain the least understood area in LIBs due to its dynamic nature, complexity in chemical composition, heterogeneity in morphology, as well as lack of reliable in situ/operando techniques for accurate characterization. In addition, chemical composition and morphology of SEI are not only affected by the choice of electrolyte, but also by the nature of the electrode surface. While introduction of defects into graphitic electrodes has promoted their electrochemical properties, how such structural defects influence SEI formation and evolution remains an open question. Here, utilizing nondestructive operando electrochemical atomic force microscopy (EChem-AFM) the dynamic SEI formation and evolution on a pair of representative graphitic materials with and without defects, namely, highly oriented pyrolytic and disordered graphite electrodes, are systematically monitored and compared. Complementary to the characterization of SEI topographical and mechanical changes during electrochemical cycling by EChem-AFM, chemical analysis and theoretical calculations are conducted to provide mechanistic insights underlying SEI formation and evolution. The results provide guidance to engineer functional SEIs through design of carbon materials with defects for LIBs and beyond.
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Affiliation(s)
- Haoyu Zhu
- Micron School of Materials Science and Engineering, Boise State University, Boise, ID 83725, USA
| | - Joshua A Russell
- Micron School of Materials Science and Engineering, Boise State University, Boise, ID 83725, USA
| | - Zongtang Fang
- Biological and Chemical Science and Engineering Department, Idaho National Laboratory, Idaho Falls, ID 83415, USA
| | - Pete Barnes
- Micron School of Materials Science and Engineering, Boise State University, Boise, ID 83725, USA
| | - Lan Li
- Micron School of Materials Science and Engineering, Boise State University, Boise, ID 83725, USA
- Center for Advanced Energy Studies, Idaho Falls, ID 83401, USA
| | - CoreyM Efaw
- Micron School of Materials Science and Engineering, Boise State University, Boise, ID 83725, USA
- Energy Storage and Advanced Transportation Department, Idaho National Laboratory, Idaho Falls, ID 83415, USA
| | - Allison Muenzer
- Micron School of Materials Science and Engineering, Boise State University, Boise, ID 83725, USA
| | - Jeremy May
- Department of Chemistry, University of Idaho, Moscow, ID 83843, USA
| | - Kailash Hamal
- Department of Chemistry, University of Idaho, Moscow, ID 83843, USA
| | - I Francis Cheng
- Department of Chemistry, University of Idaho, Moscow, ID 83843, USA
| | - Paul H Davis
- Micron School of Materials Science and Engineering, Boise State University, Boise, ID 83725, USA
| | - EricJ Dufek
- Energy Storage and Advanced Transportation Department, Idaho National Laboratory, Idaho Falls, ID 83415, USA
| | - Hui Xiong
- Micron School of Materials Science and Engineering, Boise State University, Boise, ID 83725, USA
- Center for Advanced Energy Studies, Idaho Falls, ID 83401, USA
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Hou D, Xia D, Gabriel E, Russell JA, Graff K, Ren Y, Sun CJ, Lin F, Liu Y, Xiong H. Spatial and Temporal Analysis of Sodium-Ion Batteries. ACS Energy Lett 2021; 6:4023-4054. [PMID: 34805527 PMCID: PMC8593912 DOI: 10.1021/acsenergylett.1c01868] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 10/19/2021] [Indexed: 05/02/2023]
Abstract
As a promising alternative to the market-leading lithium-ion batteries, low-cost sodium-ion batteries (SIBs) are attractive for applications such as large-scale electrical energy storage systems. The energy density, cycling life, and rate performance of SIBs are fundamentally dependent on dynamic physiochemical reactions, structural change, and morphological evolution. Therefore, it is essential to holistically understand SIBs reaction processes, degradation mechanisms, and thermal/mechanical behaviors in complex working environments. The recent developments of advanced in situ and operando characterization enable the establishment of the structure-processing-property-performance relationship in SIBs under operating conditions. This Review summarizes significant recent progress in SIBs exploiting in situ and operando techniques based on X-ray and electron analyses at different time and length scales. Through the combination of spectroscopy, imaging, and diffraction, local and global changes in SIBs can be elucidated for improving materials design. The fundamental principles and state-of-the-art capabilities of different techniques are presented, followed by elaborative discussions of major challenges and perspectives.
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Affiliation(s)
- Dewen Hou
- Micron
School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
- Center
for Nanoscale Materials, Argonne National
Laboratory, Argonne, Illinois 60439, United States
| | - Dawei Xia
- Department
of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Eric Gabriel
- Micron
School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Joshua A. Russell
- Micron
School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Kincaid Graff
- Micron
School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
| | - Yang Ren
- X-ray
Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Cheng-Jun Sun
- X-ray
Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Feng Lin
- Department
of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Yuzi Liu
- Center
for Nanoscale Materials, Argonne National
Laboratory, Argonne, Illinois 60439, United States
| | - Hui Xiong
- Micron
School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States
- Center
for Advanced Energy Studies, Idaho
Falls, Idaho 83401, United States
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Cau A, Cheng MP, Lee T, Levin A, Lee TC, Vinh DC, Lamontagne F, Singer J, Walley KR, Murthy S, Patrick D, Rewa O, Winston B, Marshall J, Boyd J, Russell JA. Acute Kidney Injury and Renal Replacement Therapy in COVID-19 Versus Other Respiratory Viruses: A Systematic Review and Meta-Analysis. Can J Kidney Health Dis 2021; 8:20543581211052185. [PMID: 34733538 PMCID: PMC8558598 DOI: 10.1177/20543581211052185] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 09/04/2021] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Acute kidney injury (AKI) is a potentially fatal complication of Coronavirus Disease-2019 (COVID-19). Binding of the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), the virus responsible for COVID-19, to its viral receptor, angiotensin converting enzyme 2 (ACE2), results in viral entry and may cause AKI. OBJECTIVES We performed a systematic review and meta-analysis of the frequencies of AKI and renal replacement therapy (RRT) in critically ill COVID-19 patients and compared those frequencies with patients who were infected by respiratory viruses that bind or downregulate ACE2 (ACE2-associated viruses) and viruses that do not bind nor downregulate ACE2 (non-ACE2-associated viruses). DESIGN Systematic review and meta-analysis. SETTING Observational studies on COVID-19 and other respiratory viral infections reporting AKI and RRT were included. The exclusion criteria were non-English articles, non-peer-reviewed articles, review articles, studies that included patients under the age of 18, studies including fewer than 10 patients, and studies not reporting AKI and RRT rates. PATIENTS Adult COVID-19, Severe Acute Respiratory Syndrome (SARS), Middle East Respiratory Syndrome (MERS), and influenza patients. MEASUREMENTS We extracted the following data from the included studies: author, year, study location, age, sex, race, diabetes mellitus, hypertension, chronic kidney disease, shock, vasopressor use, mortality, intensive care unit (ICU) admission, ICU mortality, AKI, and RRT. METHODS We systematically searched PubMed and EMBASE for articles reporting AKI or RRT. AKI was defined by authors of included studies. Critical illness was defined by ICU admission. We performed a random effects meta-analysis to calculate pooled estimates for the AKI and RRT rate within each virus group using a random intercept logistic regression model. RESULTS Of 23 655 hospitalized, critically ill COVID-19 patients, AKI frequencies were not significantly different between COVID-19 patients (51%, 95% confidence interval [CI]: 44%-57%) and critically ill patients infected with ACE2-associated (56%, 95% CI: 37%-74%, P = .610) or non-ACE2-associated viruses (63%, 95% CI: 43%-79%, P = .255). Pooled RRT rates were also not significantly different between critically ill, hospitalized patients with COVID-19 (20%, 95% CI: 16%-24%) and ACE2-associated viruses (18%, 95% CI: 8%-33%, P = .747). RRT rates for both COVID-19 and ACE2-associated viruses were significantly different (P < .001 for both) from non-ACE2-associated viruses (49%, 95% CI: 44%-54%). After adjusting for shock or vasopressor use, AKI and RRT rates were not significantly different between groups. LIMITATIONS Limitations of this study include the heterogeneity of definitions of AKI that were used across different virus studies. We could not match severity of infection or do propensity matching across studies. Most of the included studies were conducted in retrospective fashion. Last, we did not include non-English publications. CONCLUSIONS Our findings suggest that viral ACE2 association does not significantly alter the rates of AKI and RRT among critically ill patients admitted to the ICU. However, the rate of RRT is lower in patients with COVID-19 or ACE2-associated viruses when compared with patients infected with non-ACE2-binding viruses, which might partly be due to the lower frequencies of shock and use of vasopressors in these two virus groups. Prospective studies are necessary to demonstrate whether modulation of the ACE2 axis with Renin-Angiotensin System inhibitors impacts the rates of AKI and whether they are beneficial or harmful in COVID-19 patients.
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Affiliation(s)
- A. Cau
- The University of British Columbia, Vancouver, BC, Canada
| | - M. P. Cheng
- Department of Medicine, McGill University, Montreal, QC, Canada
| | - Terry Lee
- Centre for Health Evaluation & Outcomes Science, The University of British Columbia, Vancouver, BC, Canada
| | - A. Levin
- Division of Nephrology, St. Paul’s Hospital, Vancouver, BC, Canada
| | - T. C. Lee
- Department of Medicine, McGill University, Montreal, QC, Canada
| | - D. C. Vinh
- Department of Medicine, McGill University, Montreal, QC, Canada
| | | | - J. Singer
- Centre for Health Evaluation & Outcomes Science, The University of British Columbia, Vancouver, BC, Canada
| | - K. R. Walley
- Centre for Heart Lung Innovation, St. Paul’s Hospital and The University of British Columbia, Vancouver, BC, Canada
| | - S. Murthy
- BC Children’s Hospital, The University of British Columbia, Vancouver, BC, Canada
| | - D. Patrick
- British Columbia Centre for Disease Control and The University of British Columbia, Vancouver, BC, Canada
| | - O. Rewa
- University of Alberta, Edmonton, AB, Canada
| | - B. Winston
- University of Calgary, Calgary, AB, Canada
| | - J. Marshall
- St. Michael’s Hospital, University of Toronto, Toronto, ON, Canada
| | - J. Boyd
- Centre for Heart Lung Innovation, St. Paul’s Hospital and The University of British Columbia, Vancouver, BC, Canada
| | - JA Russell
- Centre for Heart Lung Innovation, St. Paul’s Hospital and The University of British Columbia, Vancouver, BC, Canada
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Parkes KA, Russell JA, Bauer WI, Miksza P. The Well-being and Instructional Experiences of K-12 Music Educators: Starting a New School Year During a Pandemic. Front Psychol 2021; 12:701189. [PMID: 34367026 PMCID: PMC8337047 DOI: 10.3389/fpsyg.2021.701189] [Citation(s) in RCA: 5] [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: 04/27/2021] [Accepted: 06/17/2021] [Indexed: 11/13/2022] Open
Abstract
In adapting to remote emergency teaching modes during pandemic-imposed conditions, teachers' instruction has changed dramatically. Early research indicates that the well-being of music teachers has suffered during the COVID-19 pandemic and that high levels of depression are widespread. The purpose of this survey study was to assess the continued psychological well-being of music teachers working amid a global pandemic based upon previous research we conducted during the Spring 2020 semester when most teachers in the United States were forced into emergency remote teaching. A secondary purpose was to explore the ways that pandemic conditions have affected music teachers' sense of safety at work and their current teaching situations. Our questionnaire consisted of sections pertaining to (1) demographic and institutional information, (2) well-being and depression, (3) instructional format and preparedness, (4) teaching efficacy compared to the start of the pandemic, and (5) potential positive outcomes of the pandemic-imposed adjustments. In total, 1,325 music teachers responded to our survey. Overall, the participants reported poorer well-being than both published norms and the sample of participants in our previous study. In addition, 17% reported mild depression, 25% reported moderate depression, and 24% reported severe extremely severe levels of depression. Summaries of the participants instructional experiences and their implications for music education are discussed within.
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Affiliation(s)
- Kelly A. Parkes
- Teachers College, Columbia University, New York, NY, United States
| | - Joshua A. Russell
- The Hartt School, The University of Hartford, West Hartford, CT, United States
| | - William I. Bauer
- School of Music, University of Florida, Gainesville, FL, United States
| | - Peter Miksza
- Jacobs School of Music, Indiana University, Bloomington, IN, United States
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Grant LK, Cohn A, Abramson M, Russell JA, Wiley A, Coborn JE, Nathan MD, Scheer FA, Klerman EB, Kaiser UB, Rahman SA, Joffe H. 0190 Impact of Menopause-Related Sleep Fragmentation on Daytime Sleepiness and Neurobehavioral Performance: Results of an Experimental Model. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Introduction
Cognitive performance may be adversely affected during the menopause transition from hot flash-induced sleep fragmentation even without changes in sleep duration. We examined the effects of experimentally-induced sleep fragmentation without shortened sleep duration on daytime sleepiness and neurobehavioral performance in women in a high and low estradiol (E2) state.
Methods
Seven pre-menopausal women (29.4 ± 3.8 years) participated in two 6-day inpatient studies repeated in a high-E2 (mid-to-late follicular phase) then low-E2 state (gonadotropin-releasing hormone agonist-induced E2 suppression - similar to levels during menopause) ~6 weeks apart. Sleep was uninterrupted on nights 1–2 [8-h time-in-bed (TIB)] and fragmented on nights 3–5 (9-h TIB) using an auditory stimulus delivered every 15 min that sustained wake for 2 minutes, producing 1-h total wake after sleep onset. Wakefulness was confirmed by event-markers during polysomnographically-recorded sleep episodes. Daytime subjective sleepiness (Karolinska Sleepiness Scale; KSS) and neurobehavioral performance (Psychomotor Vigilance Task; PVT) were assessed every 2–3 hours on study days 2–5. The effects of study day and E2 state on KSS scores and PVT measured reaction time (RT) and attentional failures (RT>500ms) were examined using linear mixed models.
Results
Participants reported feeling sleepier (+10%), had longer RTs (+22ms), and more attentional failures (+53%) after sleep fragmentation than after uninterrupted sleep (all p<0.001). While there was no main effect of E2 state, there was a differential effect of sleep fragmentation by E2 state on PVT, but not sleepiness, such that the increase in RT and attentional failures in response to sleep fragmentation was only observed in the high-E2 state (p<0.001).
Conclusion
Eight hours of total sleep time may not be sufficient to maintain subjective sleepiness and PVT performance levels when sleep is not consolidated. These findings have important implications for understanding the role of sleep and E2-modulated cognitive impairment during the menopause transition.
Support
This work was supported by the NIH: 5R01 AG053838-02 (HJ) and K24-HL105664 (EBK).
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Affiliation(s)
- L K Grant
- Division of Sleep Medicine, Department of Medicine, Harvard Medical School, Boston, MA
- Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women’s Hospital, Boston, MA
| | - A Cohn
- Division of Endocrinology, Diabetes and Hypertension, Department of Medicine, Brigham and Women’s Hospital, Boston, MA
- Women’s Hormones and Aging Research Program, Department of Psychiatry, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
| | - M Abramson
- Women’s Hormones and Aging Research Program, Department of Psychiatry, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
| | - J A Russell
- Women’s Hormones and Aging Research Program, Department of Psychiatry, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
| | - A Wiley
- Women’s Hormones and Aging Research Program, Department of Psychiatry, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
- Mary Horrigan Connors Center for Women’s Health and Gender Biology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
| | - J E Coborn
- Women’s Hormones and Aging Research Program, Department of Psychiatry, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
- Mary Horrigan Connors Center for Women’s Health and Gender Biology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
| | - M D Nathan
- Women’s Hormones and Aging Research Program, Department of Psychiatry, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
| | - F A Scheer
- Division of Sleep Medicine, Department of Medicine, Harvard Medical School, Boston, MA
- Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women’s Hospital, Boston, MA
| | - E B Klerman
- Division of Sleep Medicine, Department of Medicine, Harvard Medical School, Boston, MA
- Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women’s Hospital, Boston, MA
- Department of Neurology, Massachusetts General Hospital, Boston, MA
| | - U B Kaiser
- Division of Endocrinology, Diabetes and Hypertension, Department of Medicine, Brigham and Women’s Hospital, Boston, MA
| | - S A Rahman
- Division of Sleep Medicine, Department of Medicine, Harvard Medical School, Boston, MA
- Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women’s Hospital, Boston, MA
| | - H Joffe
- Division of Sleep Medicine, Department of Medicine, Harvard Medical School, Boston, MA
- Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women’s Hospital, Boston, MA
- Women’s Hormones and Aging Research Program, Department of Psychiatry, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
- Mary Horrigan Connors Center for Women’s Health and Gender Biology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
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Roveran Genga K, Lo C, Cirstea M, Zhou G, Walley KR, Russell JA, Levin A, Boyd JH. Two-year follow-up of patients with septic shock presenting with low HDL: the effect upon acute kidney injury, death and estimated glomerular filtration rate. J Intern Med 2017; 281:518-529. [PMID: 28317295 DOI: 10.1111/joim.12601] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [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] [Indexed: 02/01/2023]
Abstract
BACKGROUND Sepsis is associated with decreased levels of high-density lipoprotein (HDL) cholesterol. HDL has anti-inflammatory properties, and the use of Apo A-I mimetic peptides is associated with renal function improvement in animal models of sepsis. However, it is not known whether decreased HDL level results in impaired renal function in human sepsis. We investigated whether low levels of HDL conferred an increased risk of sepsis-associated acute kidney injury (AKI) or long-term decreased estimated glomerular filtration rate (eGFR) after sepsis. METHODS HDL concentration (mg dL-1 ) was measured in plasma samples from 180 patients with septic shock at admission to the Emergency Department (ED). We divided the patients using median HDL as a cut-off value and assessed the frequency of sepsis-associated AKI and long-term decreased eGFR after sepsis. Univariate and multivariate analyses were performed. RESULTS Patients with low HDL had a significantly greater frequency of KDIGO 2 or 3 sepsis-associated AKI [39/90 (43.3%) vs. 12/90 (13.3%), P < 0.001] and decreased long-term eGFR [24/58 (41.4%) vs. 11/57 (19.3%), P = 0.018] compared to those with high HDL. The adjusted OR for sepsis-associated AKI and decreased eGFR after sepsis in the lower HDL group was 2.80 (95% CI 1.08-7.25, P = 0.033) and 5.45 (95% CI 1.57-18.93, P = 0.008), respectively. CONCLUSION Low HDL levels during sepsis are associated with increased risk of sepsis-associated AKI, and/or subsequent decreased eGFR. These results suggest that HDL may be involved and/or may be a marker of kidney injury during and after sepsis.
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Affiliation(s)
- K Roveran Genga
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada
| | - C Lo
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada
| | - M Cirstea
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada
| | - G Zhou
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada
| | - K R Walley
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada
| | - J A Russell
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada
| | - A Levin
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada
| | - J H Boyd
- Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada
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Leng G, Russell JA. The Peptide Oxytocin Antagonist F-792, When Given Systemically, Does Not Act Centrally in Lactating Rats. J Neuroendocrinol 2016; 28. [PMID: 26497634 PMCID: PMC4982133 DOI: 10.1111/jne.12331] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 10/08/2015] [Accepted: 10/20/2015] [Indexed: 12/24/2022]
Abstract
Oxytocin secreted by nerve terminals in the posterior pituitary has important actions for ensuring a successful outcome of pregnancy: it stimulates uterine contractions that lead to birth and it is essential in the milk-ejection reflex, enabling milk to be expelled from the mammary glands into the mouths of suckling young. Oxytocin also has important actions in the brain: released from dendrites of neurones that innervate the posterior pituitary, oxytocin auto-excites the neurones to fire action potentials in co-ordinated bursts, causing secretion of pulses of oxytocin. Central oxytocin actions are blocked by an oxytocin antagonist given into the brain and, consequently, milk transfer stops. Systemic peptide oxytocin antagonist (atosiban) treatment is used clinically in management of pre-term labour, a major obstetric problem. Hence, it is important to know whether an oxytocin antagonist given peripherally can enter the brain and interfere with central oxytocin actions. In the present study, we tested F792, a peptide oxytocin antagonist. In urethane-anaesthetised suckled rats, we show that the mammary gland responsiveness to oxytocin is blocked by i.v. injections of 7 μg/kg of F792, and the milk-ejection reflex is blocked when F792 is given directly into the brain at a dose of 0.2 μg. To critically test whether F792 given systemically can enter the brain, we recorded the suckling- and oxytocin-induced burst-firing of individual antidromically identified oxytocin neurones in the paraventricular nucleus. Given systemically at 100 μg/kg i.v., F792 acted only peripherally, blocking the milk-ejecting actions of oxytocin, but not the burst-firing of oxytocin neurones during suckling (n = 5 neurones in five rats). Hence, this peptide oxytocin antagonist does not enter the brain from the circulation to interfere with an essential oxytocin function in the brain. Furthermore, the functions of oxytocin in the brain evidently cannot be explored with a systemic peptide antagonist.
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Affiliation(s)
- G Leng
- Centre for Integrative Physiology, University of Edinburgh, Edinburgh, UK
| | - J A Russell
- Centre for Integrative Physiology, University of Edinburgh, Edinburgh, UK
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10
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Russell JA, Brady AL, Cardman Z, Slater GF, Lim DSS, Biddle JF. Prokaryote populations of extant microbialites along a depth gradient in Pavilion Lake, British Columbia, Canada. Geobiology 2014; 12:250-264. [PMID: 24636451 DOI: 10.1111/gbi.12082] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Accepted: 01/29/2014] [Indexed: 06/03/2023]
Abstract
Pavilion Lake in British Columbia, Canada, is home to modern-day microbialites that are actively growing at multiple depths within the lake. While microbialite morphology changes with depth and previous isotopic investigations suggested a biological role in the formation of these carbonate structures, little is known about their microbial communities. Microbialite samples acquired through the Pavilion Lake Research Project (PLRP) were first investigated for phototrophic populations using Cyanobacteria-specific primers and 16S rRNA gene cloning. These data were expounded on by high-throughput tagged sequencing analyses of the general bacteria population. These molecular analyses show that the microbial communities of Pavilion Lake microbialites are diverse compared to non-lithifying microbial mats also found in the lake. Phototrophs and heterotrophs were detected, including species from the recently described Chloroacidobacteria genus, a photoheterotroph that has not been previously observed in microbialite systems. Phototrophs were shown as the most influential contributors to community differences above and below 25 meters, and corresponding shifts in heterotrophic populations were observed at this interface as well. The isotopic composition of carbonate also mirrored this shift in community states. Comparisons to previous studies indicated this population shift may be a consequence of changes in lake chemistry at this depth. Microbial community composition did not correlate with changing microbialite morphology with depth, suggesting something other than community changes may be a key to observed variations in microbialite structure.
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Affiliation(s)
- J A Russell
- School of Marine Science and Policy, University of Delaware, Lewes, DE, USA
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11
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Tobin VA, Arechaga G, Brunton PJ, Russell JA, Leng G, Ludwig M, Douglas AJ. Oxytocinase in the female rat hypothalamus: a novel mechanism controlling oxytocin neurones during lactation. J Neuroendocrinol 2014; 26:205-16. [PMID: 24612105 DOI: 10.1111/jne.12141] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [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: 12/10/2013] [Revised: 02/11/2014] [Accepted: 02/22/2014] [Indexed: 01/09/2023]
Abstract
In addition to its peripheral actions, oxytocin released within the brain is important for birth and essential for milk ejection. The oxytocinase enzyme (placental leucine aminopeptidase; P-LAP) is expressed both peripherally and centrally. P-LAP controls oxytocin degradation in the uterus, placenta and plasma during pregnancy, although its role in the hypothalamus is unclear. We investigated P-LAP expression and activity in the hypothalamus in virgin, pregnant and lactating rats, as well as its role in vivo during the milk-ejection reflex. P-LAP mRNA and protein were expressed in magnocellular neurones of the supraoptic (SON) and paraventricular (PVN) nuclei. Oxytocin neurones co-expressed P-LAP without strong subcellular co-localisation of oxytocin and P-LAP, indicating that they are packaged in separate vesicles. Examination of the intracellular distribution of oxytocin and P-LAP showed a redistribution of P-LAP to within 1 μm of the plasma membrane in the somata of oxytocin neurones during lactation. Both P-LAP mRNA expression and hypothalamic leucyl/cystinyl aminopeptidase activity in the soluble fraction were higher during lactation than in late pregnant or virgin states. Inhibition of central enzyme activity by i.c.v. injection of amastatin in anaesthetised suckling mothers increased the frequency of reflex milk ejections. Because hypothalamic P-LAP expression and activity increase in lactation, and the prevention of its action mimics central oxytocin administration, we conclude that P-LAP regulates auto-excitatory oxytocin actions during the suckling-induced milk-ejection reflex.
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Affiliation(s)
- V A Tobin
- Centre for Integrative Physiology, College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh, UK
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12
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Griffiths CD, Ng ESM, Kangarloo SB, Williamson TS, Chaudhry MA, Booker R, Duggan P, Yue P, Savoie L, Brown C, Cox-Kennett N, Russell JA, Daly A, Storek J. Fludarabine metabolite level on day zero does not affect outcomes of hematopoietic cell transplantation in patients with normal renal function. Bone Marrow Transplant 2014; 49:589-91. [PMID: 24464143 DOI: 10.1038/bmt.2013.234] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- C D Griffiths
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - E S M Ng
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - S B Kangarloo
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - T S Williamson
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - M A Chaudhry
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - R Booker
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - P Duggan
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - P Yue
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - L Savoie
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - C Brown
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - N Cox-Kennett
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - J A Russell
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - A Daly
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
| | - J Storek
- Department of Internal Medicine, University of Calgary & Alberta Health Services, Calgary, Alberta, Canada
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13
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Velmurugan S, Russell JA, Leng G. Systemic leptin increases the electrical activity of supraoptic nucleus oxytocin neurones in virgin and late pregnant rats. J Neuroendocrinol 2013; 25:383-90. [PMID: 23298261 DOI: 10.1111/jne.12016] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 11/12/2012] [Accepted: 12/20/2012] [Indexed: 12/14/2022]
Abstract
In the rat hypothalamus, fasting attenuates the expression of oxytocin and this can be reversed by exogenous leptin administration. In the present study, we investigated the effects of systemically administered leptin on the electrical activity of magnocellular neurones in the supraoptic nucleus of urethane-anaesthetised rats. In virgin female rats, systemic leptin significantly excited identified oxytocin neurones with no detected effects on the patterning of activity, as reflected by hazard function analyses. The lowest dose that was consistently effective was 100 μg/i.v., and this dose had no significant effect on vasopressin neurones. In virgin rats fasted overnight, the spontaneous firing rate of oxytocin neurones was significantly lower than in unfasted rats, although leptin had a similar excitatory effect as in unfasted rats. In late pregnant rats (days 19-21 of pregnancy), spontaneous firing rates of oxytocin neurones were higher than in virgins, and the initial response to leptin was similar to that in virgin rats, although the increase in activity was more persistent. In fasted pregnant rats, the mean spontaneous firing rate of oxytocin neurones was again lower than in unfasted rats, although leptin had no significant effect even at the higher dose of 1 mg/rat. Thus, fasting reduced the spontaneous firing rates of oxytocin neurones in nonpregnant rats, and this effect could be reversed by the excitatory effects of leptin. Pregnant rats showed some evidence of leptin resistance but only after an overnight fast.
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Affiliation(s)
- S Velmurugan
- Centre for Integrative Physiology, School of Biomedical Sciences, College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh, UK
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14
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Pratt LM, Liu Y, Ugarte-Torres A, Hoegh-Petersen M, Podgorny PJ, Lyon AW, Williamson TS, Khan FM, Chaudhry MA, Daly A, Stewart DA, Russell JA, Grigg A, Ritchie D, Storek J. IL15 levels on day 7 after hematopoietic cell transplantation predict chronic GVHD. Bone Marrow Transplant 2012; 48:722-8. [PMID: 23165502 DOI: 10.1038/bmt.2012.210] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Chronic GVHD (cGVHD) is an important complication of allogeneic hematopoietic cell transplantation (HCT). As preemptive therapy might be efficacious if administered early post transplant, we set out to determine whether cGVHD can be predicted from the serum level of a biomarker on day 7 or 28. In a discovery cohort of 153 HCT recipients conditioned with BU, fludarabine and rabbit antithymocyte globulin (ATG), we determined serum levels of B-cell-activating factor, vascular endothelial growth factor, soluble TNF-α receptor 1, soluble IL2 receptor α, IL5, IL6, IL7, IL15, γ-glutamyl transpeptidase, cholinesterase, total protein, urea and ATG. Patients with low levels of IL15 (<30.6 ng/L) on day 7 had 2.7-fold higher likelihood of developing significant cGVHD (needing systemic immunosuppressive therapy) than patients with higher IL15 levels (P<0.001). This was validated in a validation cohort of 105 similarly-treated patients; those with low IL15 levels had 3.7-fold higher likelihood of developing significant cGVHD (P=0.001). Low IL15 was not associated with relapse; it trended to be associated with acute GVHD and was associated with low infection rates. In conclusion, low IL15 levels on day 7 are predictive of cGVHD, and thus could be useful in guiding preemptive therapy.
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Affiliation(s)
- L M Pratt
- Department of Medicine, University of Calgary, Calgary, Alberta, Canada
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15
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Abstract
In virgin rats, systemic administration of interleukin (IL)-1β (i.e. to mimic infection), increases oxytocin secretion and the firing rate of oxytocin neurones in the supraoptic nucleus (SON). However, in late pregnancy, stimulated oxytocin secretion is inhibited by an endogenous opioid mechanism, preserving the expanded neurohypophysial oxytocin stores for parturition and minimising the risk of preterm labour. Central levels of the neuroactive metabolite of progesterone, allopregnanolone, increase during pregnancy and allopregnanolone acting on GABA(A) receptors on oxytocin neurones enhances inhibitory transmission. In the present study, we tested whether allopregnanolone induces opioid inhibition of the oxytocin system in response to IL-1β in late pregnancy. Inhibition of 5α-reductase (an allopregnanolone-synthesising enzyme) with finasteride potentiated IL-1β-evoked oxytocin secretion in late pregnant rats, whereas allopregnanolone reduced the oxytocin response in virgin rats. IL-1β increased the number of magnocellular neurones in the SON and paraventricular nucleus (PVN) expressing Fos (an indicator of neuronal activation) in virgin but not pregnant rats. In immunoreactive oxytocin neurones in the SON and PVN, finasteride increased IL-1β-induced Fos expression in pregnant rats. Conversely, allopregnanolone reduced the number of magnocellular oxytocin neurones activated by IL-1β in virgin rats. Treatment with naloxone (an opioid antagonist) greatly enhanced the oxytocin response to IL-1β in pregnancy, and finasteride did not enhance this effect, indicating that allopregnanolone and the endogenous opioid mechanisms do not act independently. Indeed, allopregnanolone induced opioid inhibition over oxytocin responses to IL-1β in virgin rats. Thus, in late pregnancy, allopregnanolone induces opioid inhibition over magnocellular oxytocin neurones and hence on oxytocin secretion in response to immune challenge. This mechanism will minimise the risk of preterm labour and prevent the depletion of neurohypophysial oxytocin stores, which are required for parturition.
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Affiliation(s)
- P J Brunton
- Division of Neurobiology, The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Midlothian, UK.
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16
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Hoegh-Petersen M, Goodyear D, Geddes MN, Liu S, Ugarte-Torres A, Liu Y, Walker JT, Fonseca K, Daly A, Duggan P, Stewart D, Russell JA, Storek J. High incidence of post transplant lymphoproliferative disorder after antithymocyte globulin-based conditioning and ineffective prediction by day 28 EBV-specific T lymphocyte counts. Bone Marrow Transplant 2010; 46:1104-12. [PMID: 21057556 DOI: 10.1038/bmt.2010.272] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The largest study on post-allogeneic hematopoietic cell transplant lymphoproliferative disorder (PTLD) epidemiology showed a cumulative incidence of 1.7% in patients receiving antithymocyte globulin (ATG). We had noted an apparently higher incidence in our transplant recipients whose conditioning included ATG. Therefore, we formally determined the incidence of PTLD through chart review. We also evaluated whether counts of EBV-specific T lymphocytes measured by cytokine flow cytometry could identify patients at risk of developing PTLD. Among 307 allogeneic transplant recipients, 25 (8.1%) developed PTLD. This was biopsy proven in 11 patients, and was fatal in seven patients. Patient age, EBV serostatus, donor type/match or GVHD did not influence PTLD risk significantly. Median onset of PTLD was 55 (range, 28-770) days post transplant. Day 28 EBV-specific T lymphocyte counts were not significantly different in 11 patients who developed PTLD and 31 non-PTLD patients matched for published risk factors for PTLD. In summary, when using conditioning with thymoglobulin 4.5 mg/kg, the incidence of PTLD is relatively high and cannot be predicted by day 28 cytokine flow cytometry-determined EBV-specific T lymphocyte counts. Thus, in this scenario PTLD prevention may be warranted, for example, using EBV DNAemia monitoring with preemptive therapy.
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Affiliation(s)
- M Hoegh-Petersen
- University of Calgary and Alberta Health Services, Calgary, Alberta, Canada.
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17
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Russell JA, Long CN, Engel FL. BIOCHEMICAL STUDIES ON SHOCK : II. THE ROLE OF THE PERIPHERAL TISSUES IN THE METABOLISM OF PROTEIN AND CARBOHYDRATE DURING HEMORRHAGIC SHOCK IN THE RAT. ACTA ACUST UNITED AC 2010; 79:1-7. [PMID: 19871347 PMCID: PMC2135436 DOI: 10.1084/jem.79.1.1] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The changes in the blood levels of amino nitrogen, glucose, lactate, and pyruvate were compared in eviscerate (liverless) rats and eviscerate rats subjected to hemorrhage, in order to establish the rôle of the peripheral tissues in the blood changes during shock. It was found that:- 1. The blood amino acids accumulate at a more rapid rate in the bled liverless rats than in the control liverless animals. 2. The blood sugar falls more rapidly in the liverless rat after hemorrhage, both in animals with intact suprarenal glands and those with enucleated suprarenal medullae. 3. The blood lactate and pyruvate rise slowly in the liverless rat, but maintain a constant relation to each other except terminally when convulsions occur. In the bled liverless rat both lactate and pyruvate increase much more rapidly than in the control liverless rat, and the lactate/pyruvate ratio also increases. These data are interpreted to indicate that a decrease in liver function during hemorrhagic shock serves to make apparent a considerable increase in peripheral protein catabolism and accentuates the effects of an increased carbohydrate utilization by the periphery. The lactate and pyruvate changes are determined chiefly by anoxia of the peripheral tissue and probably indicate an increasing predominance of anaerobic over aerobic metabolism of carbohydrate in muscle. The liver plays a negligible rôle in the lactate and pyruvate changes in shock.
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Affiliation(s)
- J A Russell
- Department of Physiological Chemistry, Yale University School of Medicine, New Haven
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Abstract
Follistatin is a monomeric glycoprotein, distributed in a wide range of tissues. Recent work has demonstrated that this protein is a pluripotential molecule that has no structural similarity but is functionally associated with members of the transforming growth factor (TGF)-β superfamily, which indicates its wide range of action. Members of the TGF-β superfamily, especially activins and bone morphogenetic proteins are involved in bone metabolism. They play an important role in bone physiology, influencing bone growth, turnover, bone formation and cartilage induction. As follistatin is considered to be the antagonist of the TGF-β superfamily members, it plays an important role in bone metabolism and development.
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Affiliation(s)
- A Gajos-Michniewicz
- Department of Comparative Endocrinology, Medical University of Lodz, Poland.
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Russell JA, Long CN, Wilhelmi AE. BIOCHEMICAL STUDIES ON SHOCK : IV. THE OXYGEN CONSUMPTION OF LIVER AND KIDNEY TISSUE FROM RATS IN HEMORRHAGIC SHOCK. ACTA ACUST UNITED AC 2010; 79:23-33. [PMID: 19871349 PMCID: PMC2135428 DOI: 10.1084/jem.79.1.23] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
1. With increasing severity of shock following hemorrhage in fasted rats there is an increasing depression in the rate of oxygen uptake, in oxygen, of liver slices from the bled animals. The respiration of kidney tissue is only slightly depressed even in severe states of shock. 2. The rates of oxygen uptake of liver tissue from bled rats are nicely correlated with the increases in blood amino nitrogen that follow severe hemorrhage. 3. A supplement of coenzyme factors, in the form of a hot water extract of normal rat liver, increases the oxygen uptake of liver tissue from rats in mild shock, but is without effect on the respiration of liver slices from rats in moderate or severe shock. 4. The ability of rat liver to oxidize succinate is not impaired even in severe shock, but the extra oxygen uptake does not improve the basal rate of respiration of the tissue. 5. Effects on the rate of oxygen uptake of normal rat liver slices comparable to those seen after hemorrhage could be produced by exposing the tissue to an atmosphere of nitrogen for periods of 15 and 60 minutes. This treatment had more marked effects on the respiration of kidney slices than are found after hemorrhage, but the kidney, unlike the liver, exhibited a marked degree of recovery in the presence of glucose. 6. The significance of these findings is briefly discussed.
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Affiliation(s)
- J A Russell
- Department of Physiological Chemistry, Yale University School of Medicine, New Haven
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20
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Abstract
Magnocellular neurones in the supraoptic nucleus (SON) receive major afferent inputs from the brainstem that have been implicated in the regulation of oxytocin and vasopressin secretion from the posterior pituitary. Notably, at parturition, some neurones that project from the nucleus tractus solitarii (NTS) in the brainstem directly to the SON are activated. Many of these are noradrenergic and regulate oxytocin secretion during parturition, whereas others contain somatostatin and their role is unclear. In the present study, we report that, at parturition, somatostatin mRNA expression in the NTS is significantly increased compared to pregnancy, suggesting an active role for these neurones at that time. Intracerebroventricular somatostatin infusion significantly increased plasma oxytocin secretion in both virgin female and pregnant rats. Intracerebroventricular somatostatin increased SON oxytocin and vasopressin neurone firing-rates, and increased Fos expression in the SON and paraventricular nucleus and in the subfornical organ. Retrodialysis of somatostatin onto the ventrally exposed SON also increased vasopressin neurone firing rate but, unexpectedly, decreased oxytocin neurone firing rate. The experiments indicate that somatostatin neurones in the NTS are activated during parturition but, because the direct effects of somatostatin on oxytocin neurones are inhibitory, this direct pathway does not appear to contribute to enhanced oxytocin release at this time, although indirect somatostatin effects may do so.
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Affiliation(s)
- S L Meddle
- Centre for Integrative Physiology, College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh EH8 9XD, UK.
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21
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Abstract
Stress exposure during pregnancy can 'programme' adult behaviour and hypothalamic-pituitary-adrenal (HPA) axis stress responsiveness. In the present study, we utilised an ethologically relevant social stressor to model the type of stress that pregnant women may experience. We investigated the effects of social defeat by a resident lactating rat over 5 days during the last week of pregnancy on the pregnant intruder rat HPA axis, and on HPA responsivity to stress and anxiety-related behaviour in the adult offspring of the socially-defeated intruder rats. HPA axis responses after social defeat were attenuated in the pregnant rats compared to virgin females. In the adult offspring, systemic interleukin (IL)-1beta or restraint increased adrenocorticotrophic hormone and corticosterone secretion in male and female control rats; however, in prenatally stressed (PNS) offspring, HPA responses were greatly enhanced and peak hormone responses to IL-1beta were greater in females versus males. Male PNS rats displayed increased anxiety behaviour on the elevated plus maze; however, despite marked changes in anxiety behaviour across the oestrous cycle, there were no differences between female control and PNS rats. Investigation of possible mechanisms showed mineralocorticoid mRNA levels were reduced in the hippocampus of male and female PNS offspring, whereas glucocorticoid receptor mRNA expression was modestly reduced in the CA2 hippocampal subfield in female PNS rats only. Corticotropin-releasing hormone mRNA and glucocorticoid receptor mRNA expression in the central amygdala was greater in PNS males and females compared to controls. The data obtained in the present study indicate that prenatal social stress differentially programmes anxiety behaviour and HPA axis responses to stress in male and female offspring. Attenuated glucocorticoid feedback mechanisms in the limbic system may underlie HPA axis hyper-reactivity to stress in PNS offspring.
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Affiliation(s)
- P J Brunton
- Laboratory of Neuroendocrinology, Centre for Integrative Physiology, University of Edinburgh, Hugh Robson Building, George Square, Edinburgh, UK
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22
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Abstract
Busulfan is the only agent used in myeloablative regimens for hematopoietic stem cell transplantation for which therapeutic drug monitoring (TDM) has been widely used. Studies of oral busulfan (Bu) indicate wide intrapatient and interpatient variations in pharmacokinetic (PK) behavior, particularly in children. Dose adjustments of oral Bu based on TDM to bring exposures within established therapeutic ranges have been shown to reduce toxicity and improve outcomes. Intravenous (IV) Bu is becoming more widely used and has much more predictable PK. Outcomes with IV Bu appear to be superior to those achieved using oral Bu without TDM. However there is still at least a threefold variation in exposures achieved by the same dose of IV Bu in different individuals and a small proportion of patients will experience toxic exposures with current dosing regimens. Therapeutic monitoring with appropriate dose adjustment is therefore recommended for all patients treated with regimens containing high doses of Bu. Giving IV Bu at a fixed rate to adults will narrow the range of exposures but more work is needed to establish the best dosing regimen to bring as many exposures as possible within the target range. Studies of test dosing of IV Bu show that this strategy is more accurate when test and treatment doses are infused at the same rate. Finally, targeting exposures to the upper end of the therapeutic range may provide a safe approach to exploiting dose-intensity for the treatment of some malignancies.
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Affiliation(s)
- J A Russell
- Alberta Blood & Marrow Transplant Program, Tom Baker Cancer Centre, 1331-29 St NW, Calgary, T2N 4N2, Canada.
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23
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Abstract
Over the past 40 years, it has been recognised that the maternal hypothalamic-pituitary-adrenal (HPA) axis undergoes adaptations through pregnancy and lactation that might contribute to avoidance of adverse effects of stress on the mother and offspring. The extent of the global adaptations in the HPA axis has been revealed and the underlying mechanisms investigated within the last 20 years. Both basal, including the circadian rhythm, and stress-induced adrenocorticotrophic hormone and glucocorticoid secretory patterns are altered. Throughout most of pregnancy, and in lactation, these changes predominantly reflect reduced drive by the corticotropin-releasing factor (CRF) neurones in the parvocellular paraventricular nucleus (pPVN). An accompanying profound attenuation of HPA axis responses to a wide variety of psychological and physical stressors emerges after mid-pregnancy and persists until the end of lactation. Central to this suppression of stress responsiveness is reduced activation of the pPVN CRF neurones. This is consequent on the reduced effectiveness of the stimulation of brainstem afferents to these CRF neurones (for physical stressors) and of altered processing by limbic structures (for emotional stressors). The mechanism of reduced CRF neurone responses to physical stressors in pregnancy is the suppression of noradrenaline release in the PVN by an up-regulated endogenous opioid mechanism, which is induced by neuroactive steroid produced from progesterone. By contrast, in lactation suckling the young provides a neural stimulus that dampens the HPA axis circadian rhythm and reduces stress responses. Reduced noradrenergic input activity is involved in reduced stress responses in lactation, although central prolactin action also appears important. Such adaptations limit the adverse effects of excess glucocorticoid exposure on the foetus(es) and facilitate appropriate metabolic and immune responses.
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Affiliation(s)
- P J Brunton
- Laboratory of Neuroendocrinology, Centre for Integrative Physiology, Hugh Robson Building, University of Edinburgh, Edinburgh, UK
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24
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Abstract
High-dose cytotoxic chemotherapy followed by autologous haematopoietic stem cell transplantation (ASCT) is extensively used for the treatment of many haematopoietic, as well as several epithelial cancers. Disease relapse may be the result of tumour contamination within autograft as evidenced by gene marking studies. The multiple purging strategies that have been described to date have not proven effective in most ASCT settings. This review addresses the possibility of using oncolytic viruses as a novel purging strategy. DNA viruses such as genetically engineered adenoviral vectors have widely been used to deliver either a prodrug-activating enzyme or express wild-type p53 selectively in tumour cells in ex vivo purging protocols. In addition, conditionally replicating adenoviruses that selectively replicate in tumour cells and herpes simplex virus type 1 are other DNA viruses that have been tested as ex vivo purging agents under laboratory conditions. Vesicular stomatitis virus (VSV) and reovirus are naturally occurring RNA viruses that appear to hold promise as purging agents under ex vivo and in vivo settings. Preclinical data demonstrate reovirus's purging potential against breast, monocytic and myeloma cell lines as well as patient-derived tumours of diffuse large B-cell lymphoma, chronic lymphocytic leukaemia, Waldenstrom macroglobulinemia and small lymphocytic lymphoma. In addition, VSV has shown effective killing of leukaemic cell lines and multiple myeloma patient specimens. Given the increasing interest in the utilization of viruses as purging agents, the following review provides a timely summary of the potential and the challenges of oncolytic viruses as purging modalities during ASCT.
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Affiliation(s)
- C M Thirukkumaran
- Department of Medicine, Tom Baker Cancer Centre, University of Calgary, Calgary, Alberta, Canada
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Parkins MD, Bahlis N, Brown C, Savoie L, Chaudhry A, Russell JA, Stewart DA. Overnight storage of autologous stem cell apheresis products before cryopreservation does not adversely impact early or long-term engraftment following transplantation. Bone Marrow Transplant 2006; 38:609-14. [PMID: 16980991 DOI: 10.1038/sj.bmt.1705501] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
To reduce costs and avoid inconvenient overtime work, our institution changed policy in September 2000 so that autologous stem cell apheresis products were stored overnight before cryopreservation rather than immediately processed. This retrospective review was conducted to evaluate the possible impact of this policy change on hematopoietic engraftment following autologous stem cell transplantation (ASCT). In total, 229 consecutive lymphoma patients who underwent a single, unpurged ASCT in Calgary between January 1995 and November 2003 were evaluated. Of these patients, 131 patients' autografts underwent immediate processing and cryopreservation before September 2000, and 98 patients' autografts underwent next-day cryopreservation after overnight storage following this date. Results of univariate and multivariate analyses demonstrated no adverse effect of overnight storage before cryopreservation on the number of days to initial engraftment of platelets or neutrophils, on the proportion of patients with low blood counts 6 months post-ASCT, or on lymphoma relapse rates or overall survival post-ASCT. These data suggest that overnight storage of the autograft before cryopreservation does not adversely affect graft viability or influence long-term disease status, and support the continued use of overnight storage of stem cells before cryopreservation as a convenient, cost reduction measure.
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Affiliation(s)
- M D Parkins
- Department of Medicine, University of Calgary and Tom Baker Cancer Centre, Calgary, Alberta, Canada
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Bull PM, Brown CH, Russell JA, Ludwig M. Activity-dependent feedback modulation of spike patterning of supraoptic nucleus neurons by endogenous adenosine. Am J Physiol Regul Integr Comp Physiol 2006; 291:R83-90. [PMID: 16497815 DOI: 10.1152/ajpregu.00744.2005] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Neuropeptide secretion from the dendrites of hypothalamic magnocellular supraoptic nucleus (SON) neurons contributes to the regulation of neuronal activity patterning, which ultimately determines their peptide output from axon terminals in the posterior pituitary gland. SON dendrites also secrete a number of other neuromodulators, including ATP. ATP degrades to adenosine in the extracellular space to complement transported adenosine acting on pre- and postsynaptic SON A1 receptors to reduce neuronal excitability, measured in vitro. To assess adenosine control of electrical activity in vivo, we made extracellular single-unit recordings of the electrical activity of SON neurons in anesthetized male rats. Microdialysis application (retrodialysis) of the A1 receptor antagonist, 8-cyclopentyl-1,3-dimethylxanthine (CPT) increased phasic vasopressin cell intraburst firing rates progressively over the first 5 s by 4.5 +/- 1.6 Hz (P < 0.05), and increased burst duration by 293 +/- 64% (P < 0.05). Hazard function plots were generated from interval interspike histograms and revealed that these effects were associated with increased postspike excitability. In contrast, CPT had no effect on the firing rates and hazard function plot profiles of continuously active vasopressin and oxytocin cells. However, CPT significantly increased clustering of spikes, as quantified by the index of dispersion, in oxytocin cells and continuously active vasopressin cells (by 267 +/- 113% and 462 +/- 67%, respectively, P < 0.05). Indeed, in 4 of 5 continuously active vasopressin cells, CPT induced a pseudophasic activity pattern. Together, these results indicate that endogenous adenosine is involved in the local control of SON cell activity in vivo.
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Affiliation(s)
- P M Bull
- Centre for Integrative Physiology, University of Edinburg, Edinburg, United Kingdom
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Russell JA, Brunton PJ. Neuroactive steroids attenuate oxytocin stress responses in late pregnancy. Neuroscience 2006; 138:879-89. [PMID: 16310312 DOI: 10.1016/j.neuroscience.2005.09.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2005] [Revised: 08/03/2005] [Accepted: 09/08/2005] [Indexed: 01/27/2023]
Abstract
In late pregnant rats neuroendocrine stress responses, expressed as increased oxytocin secretion and activation of the hypothalamo-pituitary-adrenal axis, are attenuated. These adaptations preserve the oxytocin store for parturition and prevent pre-term birth, and protect the fetuses from adverse programming by exposure to excess glucocorticoid. Mechanisms of adaptations for oxytocin neurones are reviewed, using challenge with systemic interleukin-1beta, simulating activation of immune signaling by infection, as a stressor of special relevance in pregnancy. In virgin rats, systemic interleukin-1beta stimulates the firing of oxytocin neurones, and hence oxytocin secretion, but interleukin-1beta has no effects in late pregnant rats. This lack of response is reversed by naloxone treatment just before interleukin-1beta administration, indicating endogenous opioid suppression of oxytocin responses in late pregnancy. This opioid presynaptically inhibits noradrenergic terminals impinging on oxytocin neurones. Finasteride pretreatment, inhibiting progesterone conversion to allopregnanolone, a positive GABA(A) receptor allosteric modifier, also restores an oxytocin response to interleukin-1beta. This finasteride effect is reversed by allopregnanolone treatment. In virgin rats allopregnanolone attenuates the oxytocin response to interleukin-1beta, which is exaggerated by naloxone. The effects of naloxone and finasteride in late pregnant rats in restoring an oxytocin response to interleukin-1beta are not additive. Accordingly, allopregnanolone may both enhance GABA inhibition of oxytocin neurone responses to interleukin-1beta, and induce opioid suppression of noradrenaline release onto oxytocin neurones.
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Affiliation(s)
- J A Russell
- Laboratory of Neuroendocrinology, Centre for Integrative Physiology, School of Biomedical Sciences, College of Medicine and Veterinary Medicine, University of Edinburgh, Hugh Robson Building, UK.
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Brunton PJ, McKay AJ, Ochedalski T, Russell JA. Allopregnanolone (AP) induces opioid inhibition of hypothalamo-pituitary-adrenal (HPA) axis responses to interleukin-1β (IL-1β) in pregnancy. Exp Clin Endocrinol Diabetes 2005. [DOI: 10.1055/s-2005-920455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Thirukkumaran CM, Luider JM, Stewart DA, Alain T, Russell JA, Auer IA, Forsyth P, Morris DG. Biological purging of breast cancer cell lines using a replication-competent oncolytic virus in human stem cell autografts. Bone Marrow Transplant 2005; 35:1055-64. [PMID: 15821774 DOI: 10.1038/sj.bmt.1704931] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Autologous hematological stem cell transplantation (ASCT) is used for the treatment of many hematological and several solid cancers. ASCT, however, has proven disappointing as a therapeutic strategy for breast cancer. Our group and others have previously shown that breast cancer micrometastases found in patients' apheresis products (APs) predict shorter progression-free and overall survival. The implications of this finding are twofold: (i) contaminating tumor cells (CTCs) in AP reflect a higher systemic disease burden and/or (ii) reinfused CTCs contribute to relapse/progressive disease. To date, purging strategies have been disappointing. We have previously demonstrated the oncolytic properties of reovirus in in vitro, in vivo and ex vivo systems. In the present study, we tested the hypothesis that reovirus purges CTCs in a breast cancer cell line purging model. Reovirus-infected human breast cancer cell lines (HTB 133, HTB 132, SKBR3 and MCF7) exhibited cell death within days. Admixtures of AP with cells from breast tumor cell lines, which were then exposed to reovirus, showed complete purging of CTCs (assessed via flow cytometry/tumor cell outgrowth analysis) without deleterious effect on CD34+ cells. Our results provide preclinical support for the ex vivo use of reovirus as a purging modality for breast cancer during ASCT.
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Affiliation(s)
- C M Thirukkumaran
- Department of Medicine, Tom Baker Cancer Centre, 1331 29th Street NW, Calgary, Alberta, Canada T2N 4N2
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Sacci JB, Ribeiro JMC, Huang F, Alam U, Russell JA, Blair PL, Witney A, Carucci DJ, Azad AF, Aguiar JC. Transcriptional analysis of in vivo Plasmodium yoelii liver stage gene expression. Mol Biochem Parasitol 2005; 142:177-83. [PMID: 15876462 DOI: 10.1016/j.molbiopara.2005.03.018] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2004] [Revised: 03/07/2005] [Accepted: 03/31/2005] [Indexed: 11/18/2022]
Abstract
The transcriptional repertoire of the in vivo liver stage of Plasmodium has remained largely unidentified and seemingly not amenable to traditional molecular analysis because of the small number of parasites and large number of uninfected hepatocytes. We have overcome this obstruction by utilizing laser capture microdissection to provide a high quality source of parasite mRNA for the construction of a liver stage cDNA library. Sequencing and annotation of this library demonstrated expression of 623 different Plasmodium yoelii genes during development in the hepatocyte. Of these genes, 25% appear to be unique to the liver stage. This is the first comprehensive analysis of in vivo gene expression undertaken for the liver stage of P. yoelii, and provides insights into the differential expression of P. yoelii genes during this critical stage of development.
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Affiliation(s)
- John B Sacci
- Department of Microbiology and Immunology, University of Maryland School of Medicine, 655 W. Baltimore Street, Baltimore, MD 21201, USA.
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Aguiar JC, LaBaer J, Blair PL, Shamailova VY, Koundinya M, Russell JA, Huang F, Mar W, Anthony RM, Witney A, Caruana SR, Brizuela L, Sacci JB, Hoffman SL, Carucci DJ. High-throughput generation of P. falciparum functional molecules by recombinational cloning. Genome Res 2004; 14:2076-82. [PMID: 15489329 PMCID: PMC528923 DOI: 10.1101/gr.2416604] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2004] [Accepted: 06/24/2004] [Indexed: 02/04/2023]
Abstract
Large-scale functional genomics studies for malaria vaccine and drug development will depend on the generation of molecular tools to study protein expression. We examined the feasibility of a high-throughput cloning approach using the Gateway system to create a large set of expression clones encoding Plasmodium falciparum single-exon genes. Master clones and their ORFs were transferred en masse to multiple expression vectors. Target genes (n = 303) were selected using specific sets of criteria, including stage expression and secondary structure. Upon screening four colonies per capture reaction, we achieved 84% cloning efficiency. The genes were subcloned in parallel into three expression vectors: a DNA vaccine vector and two protein expression vectors. These transfers yielded a 100% success rate without any observed recombination based on single colony screening. The functional expression of 95 genes was evaluated in mice with DNA vaccine constructs to generate antibody against various stages of the parasite. From these, 19 induced antibody titers against the erythrocytic stages and three against sporozoite stages. We have overcome the potential limitation of producing large P. falciparum clone sets in multiple expression vectors. This approach represents a powerful technique for the production of molecular reagents for genome-wide functional analysis of the P. falciparum genome and will provide for a resource for the malaria resource community distributed through public repositories.
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Affiliation(s)
- João Carlos Aguiar
- Malaria Program, Naval Medical Research Center, Silver Spring, Maryland 20910, USA.
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Somponpun SJ, Holmes MC, Seckl JR, Russell JA. Modulation of oestrogen receptor-beta mRNA expression in rat paraventricular and supraoptic nucleus neurones following adrenal steroid manipulation and hyperosmotic stimulation. J Neuroendocrinol 2004; 16:472-82. [PMID: 15117341 DOI: 10.1111/j.1365-2826.2004.01190.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Magnocellular neurosecretory neurones in the hypothalamic paraventricular (PVN) and supraoptic (SON) nuclei express oestrogen receptor beta (ERbeta) but not ERalpha. In the PVN, ERbeta is strongly expressed in the ventromedial parvocellular neurones projecting to the brainstem. We used quantitative in situ hybridization, with (35)S-labelled riboprobes, to study heterologous regulation by manipulating adrenal steroid hormones (72 h after adrenalectomy +/- corticosterone replacement; repeated stress: halothane inhalation, environmental cold, immobilization, each daily for 3 days) in male rats. Adrenalectomy increased ERbeta mRNA expression in the magnocellular PVN and SON, by 2.2 and 2.5-fold, respectively, with no effect in the ventromedial parvocellular PVN neurones. Corticosterone replacement partially prevented the increases in ERbeta mRNA expression in magnocellular PVN and SON neurones. Repeated stress over 72 h had no effect on ERbeta mRNA expression in the magnocellular PVN or SON, but increased expression 1.4-fold in the ventromedial parvocellular PVN neurones. Although consequences of hydromineral balance derangement after adrenalectomy may stimulate magnocellular neurones, strongly stimulating the neurones by giving intact male rats 2% saline to drink for 72 h decreased ERbeta mRNA expression in the magnocellular PVN and SON neurones by approximately 60%, and in the ventromedial parvocellular PVN neurones by 13%. Thus, ERbeta mRNA expression is negatively regulated by basal glucocorticoid secretion in magnocellular PVN and SON neurones, and positively regulated by stress in ventromedial parvocellular PVN neurones. However, ERbeta mRNA expression in magnocellular neurones is negatively linked to hyperosmotic stimulation of the neurones. The 6.25-fold variation in ERbeta mRNA expression in magnocellular neurones from salt-loading to adrenalectomy could alter their sensitivity to oestrogens. Consequently, regulation of oxytocin and vasopressin neurone activity via ERbeta is expected to vary according to their functional state and, in particular, on basal glucocorticoid actions.
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Affiliation(s)
- S J Somponpun
- Laboratory of Neuroendocrinology, Division of Biomedical Sciences, College of Medicine and Veterinary Medicine, The University of Edinburgh, Edinburgh, UK
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Karlsson L, Quinlan D, Guo D, Brown C, Selinger S, Klassen J, Russell JA. Mobilized blood cells vs bone marrow harvest: experience compared in 171 donors with particular reference to pain and fatigue. Bone Marrow Transplant 2004; 33:709-13. [PMID: 14755321 DOI: 10.1038/sj.bmt.1704418] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This prospective study compared the donor experience of blood cell (BC) mobilization and leukapheresis (n=116) with that of bone marrow (BM) harvest (n=55). Internal jugular catheters were inserted electively in 89% of BC donors. Most (80%) BM donors had a harvest with general anesthesia; 20% had epidural or spinal anesthesia. Pain and fatigue were frequent with both procedures and were compared in responses to questionnaires. A total of 85% of BM donors reported moderate or severe pain compared with 68% of BC donors (P=0.02). The median duration of pain was 14 days for BM donors compared with 3 days after BC mobilization (P<0.0001). More BM donors had pain for more than 7 days (75% vs 0%, P<0.0001). Severe fatigue was experienced by more BM donors (49 vs 16%, P<0.0001). Fatigue lasted significantly longer in BM donors (median 11 vs 4 days, P<0.0001) and more BM donors were fatigued for more than 1 week (69 vs 0%, P<0.0001). A total of 11 donors had both BM and BC collection; seven preferred the latter. Simply considered with respect to pain and fatigue, BC donation appears better tolerated by donors. However, there are other sequelae of both influencing the acceptability for individual donors.
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Affiliation(s)
- L Karlsson
- Alberta Bone Marrow Transplant Program and Department of Medicine, Tom Baker Cancer Centre, Calgary, Alberta, Canada
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Cudkowicz ME, Shefner JM, Schoenfeld DA, Brown RH, Johnson H, Qureshi M, Jacobs M, Rothstein JD, Appel SH, Pascuzzi RM, Heiman-Patterson TD, Donofrio PD, David WS, Russell JA, Tandan R, Pioro EP, Felice KJ, Rosenfeld J, Mandler RN, Sachs GM, Bradley WG, Raynor EM, Baquis GD, Belsh JM, Novella S, Goldstein J, Hulihan J. A randomized, placebo-controlled trial of topiramate in amyotrophic lateral sclerosis. Neurology 2003; 61:456-64. [PMID: 12939417 DOI: 10.1212/wnl.61.4.456] [Citation(s) in RCA: 162] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To determine if long-term topiramate therapy is safe and slows disease progression in patients with ALS. METHODS A double-blind, placebo-controlled, multicenter randomized clinical trial was conducted. Participants with ALS (n = 296) were randomized (2:1) to receive topiramate (maximum tolerated dose up to 800 mg/day) or placebo for 12 months. The primary outcome measure was the rate of change in upper extremity motor function as measured by the maximum voluntary isometric contraction (MVIC) strength of eight arm muscle groups. Secondary endpoints included safety and the rate of decline of forced vital capacity (FVC), grip strength, ALS functional rating scale (ALSFRS), and survival. RESULTS Patients treated with topiramate showed a faster decrease in arm strength (33.3%) during 12 months (0.0997 vs 0.0748 unit decline/month, p = 0.012). Topiramate did not significantly alter the decline in FVC and ALSFRS or affect survival. Topiramate was associated with an increased frequency of anorexia, depression, diarrhea, ecchymosis, nausea, kidney calculus, paresthesia, taste perversion, thinking abnormalities, weight loss, and abnormal blood clotting (pulmonary embolism and deep venous thrombosis). CONCLUSIONS At the dose studied, topiramate did not have a beneficial effect for patients with ALS. High-dose topiramate treatment was associated with a faster rate of decline in muscle strength as measured by MVIC and with an increased risk for several adverse events in patients with ALS. Given the lack of efficacy and large number of adverse effects, further studies of topiramate at a dose of 800 mg or maximum tolerated dose up to 800 mg/day are not warranted.
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Affiliation(s)
- M E Cudkowicz
- Neurology Clinical Trials Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
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Abstract
Orexins are hypothalamic neuropeptides that stimulate arousal and food intake but also activate the hypothalamic-pituitary-adrenal (HPA) axis. During late pregnancy in the rat, the responsiveness of the HPA axis to stressors is attenuated, and thus we investigated HPA axis responses to centrally administered orexin-A during pregnancy. Intracerebroventricular injection of orexin-A (0.5 micro g, 140 pmol) significantly increased plasma adrenocorticotropic hormone and corticosterone concentration within 10 min in virgin female Sprague-Dawley rats, but had no effect in day 21 pregnant rats. Orexin-A significantly increased corticotropin-releasing hormone (CRH) mRNA expression, measured by in situ hybridization, in the paraventricular nucleus (PVN) of the virgin group but not in the pregnant group. Thus, the responsiveness of PVN CRH neurones to orexin-A, and hence the pituitary-adrenal axis, is markedly reduced in pregnancy. This may favour anabolic adaptations in pregnancy.
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Affiliation(s)
- P J Brunton
- Laboratory of Neuroendocrinology, School of Biomedical and Clinical Laboratory Sciences, University of Edinburgh, Edinburgh, UK.
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Russell JA, Tran HT, Quinlan D, Chaudhry A, Duggan P, Brown C, Stewart D, Ruether JD, Morris D, Glick S, Gyonyor E, Andersson BS. Once-daily intravenous busulfan given with fludarabine as conditioning for allogeneic stem cell transplantation: study of pharmacokinetics and early clinical outcomes. Biol Blood Marrow Transplant 2003; 8:468-76. [PMID: 12374451 DOI: 10.1053/bbmt.2002.v8.pm12374451] [Citation(s) in RCA: 223] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The availability of an i.v. form of busulfan (Bu) has prompted investigation of administration schedules other than the 4-times-daily dosage commonly used with oral Bu. We have studied an allogeneic stem cell transplantation (SCT) preparative regimen comprising fludarabine (FLU) 50 mg/m2 on days -6 to -2 plus i.v. Bu 3.2 mg/kg daily in a 3-hour infusion on days -5 to -2. The regimen was given to 70 patients aged 15 to 64 years (median, 41 years) with hematologic malignancy. Thirty-six patients (51%) had high-risk malignancy, 28 (40%) had unrelated or genotypically mismatched related donors (alternate donors [AD]) and 29 (41%) received bone marrow rather than blood as stem cell source. Acute GVHD prevention comprised antithymocyte globulin 4.5 mg/kg over 3 days pretransplantation, cyclosporin A, and short-course methotrexate with folinic acid. Hepatic toxicity was transient and there was no clinically diagnosed veno-occlusive disease. Grade II stomatitis occurred in 49 patients (70%) and hemorrhagic cystitis in 9 patients (13%). One patient with subtherapeutic phenytoin levels had a convulsion 8 hours after the third i.v. Bu dose, but no other neurotoxicity was apparent. Incidence of acute GVHD grades II to IV was 8% and incidence of grade III-IV was 3%, with no deaths from this cause. Actuarial incidence of chronic GVHD at 2 years is 38%. There were 2 cases of graft failure in unrelated donor BMT recipients, 1 of which was reversed by asecond transplantation. With a median follow-up of 16 months (range, 6-27 months), transplantation-related mortality at 100 days and 2 years was 2% and 5% for matched related donor (MRD) SCT and 8% and 19% for AD SCT, respectively (P = not significant). Relapse rates were 21% for 34 patients with acute myeloid leukemia (AML) in complete remission or chronic myeloid leukemia in chronic phase (low-risk), 66% for 19 patients with high-risk AML, and 18% for 17 patients with other active malignancy. Projected disease-free and overall survival rates at 2 years were 74% and 88% for low-risk disease, 26% and 37% for advanced AML, and 65% and 71% for other high-risk disease, respectively. Pharmacokinetic studies were done using 11 samples with the first and fourth doses of Bu. Kinetics were linear, and for the first and fourth doses, the half-lives were 2.60 +/- 0.44 and 2.57 +/- 0.36 hours, respectively. Clearances were 106.77 +/- 16.68 and 106.86 +/- 21.57 mL/min per m2, peak concentrations (Cmax) were 3.92 +/- 0.31 and 3.96 +/- 0.28 mcg/mL, and Bu areas under the plasma concentration versus time curve (AUC) were 4866.51 +/- 771.42 and 4980 +/- 882.80 microM x min, respectively. Bu was completely cleared within 24 hours and the day 4 pharmacokinetic values were very similar to those on day 1 for every patient. The cumulative AUC was comparable to the target range established for p.o. Bu. This regimen incorporating once-daily i.v. Bu is convenient to give, is relatively well tolerated, gives predictable blood levels, and deserves further study in circumstances in which cytoreduction as well as immune suppression is needed.
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Affiliation(s)
- J A Russell
- Department of Medicine, Foothills Hospital and Tom Baker Cancer Centre, Calgary, Alberta, Canada.
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Abstract
To elucidate the co-evolutionary relationships between phloem-feeding insects and their secondary, or facultative, bacterial symbionts, we explore the distributions of three such microbes--provisionally named the R-type (or PASS, or S-sym), T-type (or PABS), and U-type--across a number of aphid and psyllid hosts through the use of diagnostic molecular screening techniques and DNA sequencing. Although typically maternally transmitted, phylogenetic and pairwise divergence analyses reveal that these bacteria have been independently acquired by a variety of unrelated insect hosts, indicating that horizontal transfer has helped to shape their distributions. Based on the high genetic similarity between symbionts in different hosts, we argue that transfer events have occurred recently on an evolutionary timescale. In several instances, however, closely related symbionts associate with related hosts, suggesting that horizontal transfer between distant relatives may be rarer than transmission between close relatives. Our findings on the prevalence of these symbionts within many aphid taxa, along with published observations concerning their effects on host fitness, imply a significant role of facultative symbiosis in aphid ecology and evolution.
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Affiliation(s)
- J A Russell
- University of Arizona, Department of Ecology and Evolutionary Biology, Biological Sciences West, Tucson, Arizona 85721, USA.
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Cheng T, Forsyth P, Chaudhry A, Morris D, Glück S, Russell JA, Stewart DA. High-dose thiotepa, busulfan, cyclophosphamide and ASCT without whole-brain radiotherapy for poor prognosis primary CNS lymphoma. Bone Marrow Transplant 2003; 31:679-85. [PMID: 12692608 DOI: 10.1038/sj.bmt.1703917] [Citation(s) in RCA: 114] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Treatment of primary central nervous system lymphoma (PCNSL) with combined high-dose methotrexate (HD-MTX)-based chemotherapy and whole-brain radiotherapy (WBRT) is associated with severe neurotoxicity, but high relapse rates are associated with the use of either modality alone. In an attempt to improve upon these dismal results, we treated seven PCNSL patients with HD-MTX-based induction therapy followed by thiotepa, busulfan, cyclophosphamide (TBC), and autologous stem cell transplant (ASCT), without WBRT. Six of these patients had at least one of the following poor prognostic features: Karnofsky performance status (KPS) <or=50%, age >60 years, or relapsed disease. All but one patient tolerated the treatment well and experienced improvements in neurological function and overall performance status post-transplant. No treatment-induced neurotoxicity (dementia, ataxia, and incontinence) was observed although the follow-up is short. One early treatment-related death occurred in a patient with multiple comorbid medical conditions. The other six patients achieved a complete response (CR) after TBC and ASCT. Five patients are currently alive and relapse-free at 5, 8, 24, 36, and 42 months from diagnosis. One additional patient relapsed and died 33 months after diagnosis. Two of the seven patients received TBC/ASCT as the only treatment after disease progression following their initial chemotherapy and both remain relapse-free at the time of this report, 22 and 31 months post-TBC/ASCT. In conclusion, prolonged CR can be attained after chemotherapy-only treatment of poor prognosis PCNSL. Furthermore, this small series suggests that high-dose chemotherapy for PCNSL should include drugs that penetrate the CNS such as busulfan and thiotepa rather than standard lymphoma regimens such as BEAM.
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Affiliation(s)
- T Cheng
- Department of Medicine, Tom Baker Cancer Centre, University of Calgary, Alta, Canada
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Abstract
It has previously been postulated that rapid red cell capillary transit through the human lung plays a role in the mechanism of diffusion limitation in some endurance athletes. Methodological limitations currently prevent researchers from directly measuring pulmonary capillary transit times in humans during exercise; however, first pass radionuclide cardiography allows direct measurement of red blood cell (RBC) transit times through the whole lung at various exercise intensities. We examined the relationship between mean whole lung red cell pulmonary transit times (cardiopulmonary transit times or CPTT) and different levels of flow in 88 healthy humans (76 males, 12 females) from several studies (mean age 31 years). The pooled data suggest that the relationship between CPTT and cardiac index (CI), beginning at rest and progressing through to maximum exercise demonstrates that CPTT reaches its minimum value when CI is about 8.1 l m2 x min(-1) (2.5-3 times the CI value at rest), and does not significantly change with further increases in CI. Cardiopulmonary blood volume (CPBV) index also does not change significantly until CI reaches 2.5 to 3 times the CI value at rest and then increases roughly linearly after that point. Consequently, the systematic increase in CPBV index with increasing pulmonary blood flow between 8.1 and 20 l m2 x min(-1) displays an adaptive response of the cardiopulmonary system by augmenting CPBV (and perhaps pulmonary capillary blood volume through distension and recruitment) to offset the reduction in CPTT, as no significant difference in mean CPTT is observed between these levels of flow (P > 0.05). Therefore, these data demonstrate that CPBV does not reach maximum capacity during strenuous or maximum exercise. This does not support the principle of quarter-power allometric scaling for flow when explaining modifications during exercise. Therefore, we speculate that the observed relationships between CPTT, CBPV index and flow may prevent mean CPTT (and perhaps mean pulmonary capillary transit times) from decreasing below the threshold time required for oxygenation.
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Affiliation(s)
- G S Zavorsky
- Department of Experimental Medicine, University of British Columbia, Vancouver Hospital and Health Sciences Center, Koerner Pavillion, S154, 2211 Wesbrook Mall, Vancouver, BC, Canada V6T-1Z3.
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Russell JA, Leng G. Editorial commentary: Ready to burst? J Neuroendocrinol 2002; 14:927-8. [PMID: 12472872 DOI: 10.1046/j.1365-2826.2001.00874.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Duggan P, Booth K, Chaudhry A, Stewart D, Ruether JD, Glück S, Morris D, Brown CB, Herbut B, Coppes M, Anderson R, Wolff J, Egeler M, Desai S, Turner AR, Larratt L, Gyonyor E, Russell JA. Unrelated donor BMT recipients given pretransplant low-dose antithymocyte globulin have outcomes equivalent to matched sibling BMT: a matched pair analysis. Bone Marrow Transplant 2002; 30:681-6. [PMID: 12420207 DOI: 10.1038/sj.bmt.1703674] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2002] [Accepted: 05/23/2002] [Indexed: 11/08/2022]
Abstract
Fifty-seven patients receiving unrelated donor (UD) BMT were matched for disease and stage with 57 recipients of genotypically matched related donor (MRD) BMT. All UD recipients were matched serologically for A and B and by high resolution for DR and DQ antigens. All patients received CsA and 'short course' methotrexate with folinic acid. Unrelated donor BMT patients also received thymoglobulin 4.5 mg/kg (6 mg/kg if <30 kg) in divided doses over 3 days pretransplant. For UD and RD BMT, respectively, incidence of acute GVHD grade II-IV was 19 +/- 6% vs 36 +/- 8%, grade III-IV 10 +/- 6% vs 18 +/- 7%, chronic GVHD 44 +/- 8% vs 51 +/- 8%, non-relapse mortality 15 +/- 5% vs 8 +/- 4% at 100 days, 28 +/- 8% vs 36 +/- 7% at 3 years. At 3 years, relapse was 45 +/- 7% vs 42 +/- 7%, and disease-free survival 39 +/- 7% vs 37 +/- 7%. None of these differences are significant. Three-year overall survival was identical at 42 +/- 7%. For 29 patients with low/intermediate risk leukemia, disease-free survival was 68 +/- 10% after UD BMT vs 59 +/- 9% for RD BMT recipients (P = NS). Corresponding figures for high risk patients were 14 +/- 7% and 21 +/- 8%, respectively. We conclude that UD BMT recipients matched as above and given pretransplant ATG have similar outcomes to recipients of MRD BMT using conventional drug prophylaxis. Unrelated donor BMT should be considered in any circumstance where MRD BMT is routine.
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Affiliation(s)
- P Duggan
- Department of Medicine, Foothills Hospital, Calgary, Alberta, Canada
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Douglas AJ, Bicknell RJ, Leng G, Russell JA, Meddle SL. Beta-endorphin cells in the arcuate nucleus: projections to the supraoptic nucleus and changes in expression during pregnancy and parturition. J Neuroendocrinol 2002; 14:768-77. [PMID: 12372001 DOI: 10.1046/j.1365-2826.2002.00837.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Supraoptic nucleus oxytocin neurone activity and secretion are inhibited in late pregnancy and parturition by endogenous opioids. Here, we investigated alterations in the projections and gene expression of beta-endorphin/pro-opiomelanocortin neurones in the arcuate nucleus in the pregnant rat. All regions of the arcuate nucleus were found to contain cells immunoreactive for beta-endorphin fluorescent microbeads retrogradely transported from the supraoptic nucleus, and double-labelled neurones (beta-endorphin plus microbeads), showing that beta-endorphin neurones throughout the arcuate nucleus project to the supraoptic nucleus. There was an increase in the number of beta-endorphin-immunoreactive cells in the arcuate nucleus and an increase in the density of beta-endorphin fibres within the supraoptic nucleus and peri-supraoptic region in late pregnancy and parturition, suggesting enhanced expression of beta-endorphin and increased beta-endorphin innervation of the supraoptic nucleus. Pro-opiomelanocortin mRNA expression in the arcuate nucleus increased in late compared to early pregnancy: the number of positive neurones significantly increased in the caudal region. Fos expression (an indicator of neuronal activation) in the arcuate nucleus was colocalized in beta-endorphin neurones in both proestrus and parturient rats, but the number of positive cells did not increase during parturition, suggesting lack of activation of beta-endorphin neurones at birth. Thus, beta-endorphin cells in the arcuate nucleus project to the supraoptic nucleus and increased innervation during pregnancy may explain the enhanced endogenous opioid inhibition of oxytocin neurones.
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Affiliation(s)
- A J Douglas
- Division of Biomedical Sciences, University of Edinburgh, George Square, Edinburgh, UK.
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Zavorsky GS, Walley KR, Hunte GS, McKenzie DC, Sexsmith GP, Russell JA. Acute hypervolemia lengthens red cell pulmonary transit time during exercise in endurance athletes. Respir Physiol Neurobiol 2002; 131:255-68. [PMID: 12126926 DOI: 10.1016/s1569-9048(02)00028-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The purpose was to determine if acute plasma volume expansion (PVE) changed red-cell pulmonary transit time (PTT) during severe exercise. Twelve endurance athletes performed 6.5 min of severe cycling exercise on different days. Pentaspan [(500 ml, infusion condition, I] or placebo [(60 ml saline), non-infusion condition, N] were infused prior to exercise. Blood gas tensions, PTT, multigated acquisition (MUGA) derived cardiac output, and oxygen uptake were measured during exercise. PTT was measured during minute 3 of exercise by radionuclide cardiography. Arterial P(O(2)) (Pa(O(2))), and alveolar-arterial oxygen pressure difference (AaD(O(2))) at minute 3 of exercise did not differ between conditions. Mean PTT at minute 3 of exercise was 0.3 sec longer in the I condition (P=0.002). However, the change in PTT between conditions was not correlated to the change in either Pa(O(2)) or AaD(O(2)). We conclude that PVE slows (lengthens) PTT without affecting pulmonary gas exchange. Therefore, rapid PTT may not be related to hypoxemia during exercise.
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Affiliation(s)
- G S Zavorsky
- Department of Experimental Medicine, University of British Columbia, BC, V6T-1Z3, Vancouver, Canada.
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Abstract
The role of oxytocin in parturition in mice was investigated. Pup birth profiles, blood samples and brains were collected from parturient mice observed under red light conditions in a reversed light:dark photoperiod. Peripheral administration of an oxytocin antagonist in a dose-dependent manner delayed the birth of subsequent pups, indicating that oxytocin is required for a normal pup birth profile. Oxytocin neurones were activated during birth as shown by both increased immediate early gene ( Fos) expression in oxytocin neurones in the supraoptic nucleus and increased plasma oxytocin concentrations during birth. In addition, the nucleus of the tractus solitarius and the olfactory bulbs, sites that process inputs to oxytocin neurones, become activated during parturition. Exposure to stress during parturition halted subsequent deliveries; at this stage plasma oxytocin concentrations were not higher than those of virgin mice, and birth was restored by administration of oxytocin. Administration of beta-adrenergic antagonist (propranolol) also restored stress-delayed birth, whereas administration of ritrodrine (beta-agonist) delayed birth in non-stressed mice, indicating that adrenergic mechanisms contribute to stress-delayed births in mice. Administration of morphine (mu-opioid agonist) delayed births transiently, but naloxone (opioid antagonist) did not prevent stress-delayed birth, indicating that endogenous opioids do not appear to contribute to neuroendocrine or uterine mechanisms that promote birth in mice. Therefore, despite evidence in oxytocin knockout mice that oxytocin is not essential for parturition in this species, the results of the present study indicate that oxytocin neurone activity and secretion contribute to the birth process in normal mice.
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Affiliation(s)
- A J Douglas
- Laboratory of Neuroendocrinology, Division of Biomedical and Clinical Laboratory Sciences, University of Edinburgh, EH8 9XD, UK.
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Russell JA, Douglas AJ, Ingram CD. Brain preparations for maternity--adaptive changes in behavioral and neuroendocrine systems during pregnancy and lactation. An overview. Prog Brain Res 2001; 133:1-38. [PMID: 11589124 DOI: 10.1016/s0079-6123(01)33002-9] [Citation(s) in RCA: 146] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Pregnancy, parturition and lactation comprise a continuum of adaptive changes necessary for the development and maintenance of the offspring. The endocrine changes that are driven by the conceptus and are essential for the maintenance of pregnancy and are involved in the preparations for motherhood are outlined. These changes include large increases in the secretion of sex steroid hormones, and the secretion of peptide hormones that are unique to pregnancy. The ability of these pregnancy hormones to alter several aspects of brain function in pregnancy is considered, and the adaptive importance of some of these changes is discussed, for example in metabolic and body fluid adjustments, and the induction of maternal behavior. The importance of sex steroids in determining the timing of the various adaptive changes in preparing for parturition and maternal behavior is emphasized, and the concept that the actions of prolactin and oxytocin, quintessential mammalian motherhood neuropeptides, can serve to coordinate a spectrum of adaptive changes is discussed. The part played by oxytocin neurons and their regulatory mechanisms is reviewed to illustrate how neural systems involved in maternity are prepared in pregnancy via changes in phenotype, synaptic organization and in the relative importance of their different inputs, to function optimally when needed. For oxytocin neurons secreting from the posterior pituitary, important in parturition and essential in lactation, these changes include mechanisms to restrain their premature activation, and adaptations to support synchronized burst firing for pulsatile oxytocin secretion in response to stimulation via afferents from the birth canal, olfactory system or suckled nipples. Within the brain, expression of oxytocin receptors permits centrally released oxytocin to facilitate the expression of maternal behavior. Changes in other neuroendocrine systems are similarly extensive, leading to lactation, suppression of ovulation, reduced stress responses and increased appetite; these changes in lactation are driven by the suckling stimulus. The possible link between these adaptations and changes in cognition and mood in pregnancy and post partum are considered, as well as the dysfunctions that lead to common problems of depression and puerperal psychoses.
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Affiliation(s)
- J A Russell
- Laboratory of Neuroendocrinology, Section of Biomedical Sciences, Division of Biomedical and Clinical Laboratory Sciences, University of Edinburgh, Hugh Robson Building, George Square, Edinburgh EH8 9XD, UK.
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Abstract
Progress of parturition in the rat is optimal when there is increased oxytocin secretion, thus ensuring quick birth and otherwise risking adverse neonatal health. To ensure that the mechanisms for this are available, oxytocin neurons adapt in pregnancy and this includes development of a tonic inhibition by endogenous opioids. Endogenous opioid inhibition of oxytocin secretion increases in pregnancy, initially acting on the nerve terminals in the posterior pituitary and later on oxytocin cell bodies and their inputs. This inhibition enhances stores of oxytocin and enables restraint of oxytocin neuron responsiveness to selected excitatory inputs. The hypothalamic neurons which mediate stress also adapt in late pregnancy so that hypothalamo-pituitary-adrenal axis and oxytocin secretory responses to stressor exposure are attenuated. This is also partly due to endogenous opioid inhibition. Thus, in pregnancy oxytocin and hypothalamo-pituitary-adrenal axis secretion in response to stimulation is restrained, protecting the unborn fetus(es) from premature delivery and glucocorticoid exposure and preparing the oxytocin neurons for their important secretory role during parturition. In parturition itself, endogenous opioids continue to inhibit these neurons. Stress exposure during parturition delays births, probably due to endogenous opioid inhibition of pulsatile oxytocin secretion. On the other hand, basal ACTH and corticosterone secretion are reduced in parturition through inhibition by endogenous opioids. So, opioids continue to regulate the activity of oxytocin and hypothalamo-pituitary-adrenal mechanisms in labor; inhibition of oxytocin neurons at this time may control the spacing of pup births.
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Affiliation(s)
- A J Douglas
- Laboratory of Neuroendocrinology, Department of Biomedical Sciences, University of Edinburgh, Edinburgh, EH8 9XD, UK.
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Bernard GR, Ely EW, Wright TJ, Fraiz J, Stasek JE, Russell JA, Mayers I, Rosenfeld BA, Morris PE, Yan SB, Helterbrand JD. Safety and dose relationship of recombinant human activated protein C for coagulopathy in severe sepsis. Crit Care Med 2001; 29:2051-9. [PMID: 11700394 DOI: 10.1097/00003246-200111000-00003] [Citation(s) in RCA: 217] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVES To assess the safety and effect on coagulopathy of a range of doses of recombinant human activated protein C (rhAPC). To determine an effective dose and duration of rhAPC for use in future clinical trials. DESIGN Double-blind, randomized, placebo-controlled, multicenter, dose-ranging (sequential), phase II clinical trial. SETTING Forty community or academic medical institutions in United States and Canada. PATIENTS One hundred thirty-one adult patients with severe sepsis. INTERVENTIONS Intravenous infusion of rhAPC (12, 18, 24, or 30 microg/kg/hr) or placebo for 48 or 96 hrs. MEASUREMENTS AND MAIN RESULTS No significant differences in incidence of serious bleeding events (4% rhAPC, 5% placebo, p >.999) or incidence of serious adverse events (39% rhAPC, 46% placebo, p = 0.422) between rhAPC- and placebo-treated patients were observed. One of 53 rhAPC-treated patients with suitable immunogenicity samples had a low level, transient, non-neutralizing anti-APC antibody response not associated with any clinical adverse event. Significant dose-dependent decreases in both D-dimer (p <0.001) and end of infusion interleukin 6 levels (p =.021) were demonstrated. No statistically significant effects on fibrinogen or platelet counts were observed. A nonstatistically significant 15% relative risk reduction in 28-day all-cause mortality was observed between rhAPC- and placebo-treated patients. CONCLUSIONS rhAPC was safe and well-tolerated and demonstrated a dose-dependent reduction in D-dimer and interleukin 6 levels relative to placebo. The dose of 24 microg/kg/hr for 96 hrs was selected for use in future clinical studies.
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Affiliation(s)
- G R Bernard
- Department of Medicine, Division of Allergy, Pulmonary and Critical Care Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232-2650, USA.
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Steinhorn RH, Albert G, Swartz DD, Russell JA, Levine CR, Davis JM. Recombinant human superoxide dismutase enhances the effect of inhaled nitric oxide in persistent pulmonary hypertension. Am J Respir Crit Care Med 2001; 164:834-9. [PMID: 11549542 DOI: 10.1164/ajrccm.164.5.2010104] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We investigated the pulmonary vascular effects of superoxide dismutase (SOD) alone and in combination with inhaled nitric oxide (iNO) in newborn lambs with persistent pulmonary hypertension (PPHN) following prenatal ligation of the ductus arteriosus. In in vitro experiments, pretreatment with SOD significantly enhanced vascular relaxation in response to the NO donor S-nitrosyl-acetylpenicillamine (SNAP) in fifth-generation pulmonary arteries isolated from lambs with PPHN. In vivo treatment of fully instrumented newborn lambs with a single intratracheal dose of recombinant human CuZn SOD (rhSOD; 5 mg/kg) produced selective dilation of the pulmonary circulation. Further studies, of the combination of rhSOD and iNO, showed enhancement of the pulmonary vascular effects of iNO after brief periods of inhalation of 5 ppm and 80 ppm NO. We conclude that rhSOD reduces pulmonary vascular resistance and facilitates the action of iNO in a lamb model of PPHN. This suggests that rhSOD may prove to be an effective adjunctive treatment for newborns with PPHN.
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Affiliation(s)
- R H Steinhorn
- Department of Pediatrics, Northwestern University, Chicago, Illinois, USA.
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Leng G, Brown CH, Bull PM, Brown D, Scullion S, Currie J, Blackburn-Munro RE, Feng J, Onaka T, Verbalis JG, Russell JA, Ludwig M. Responses of magnocellular neurons to osmotic stimulation involves coactivation of excitatory and inhibitory input: an experimental and theoretical analysis. J Neurosci 2001; 21:6967-77. [PMID: 11517284 PMCID: PMC6763076] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023] Open
Abstract
How does a neuron, challenged by an increase in synaptic input, display a response that is independent of the initial level of activity? Here we show that both oxytocin and vasopressin cells in the supraoptic nucleus of normal rats respond to intravenous infusions of hypertonic saline with gradual, linear increases in discharge rate. In hyponatremic rats, oxytocin and vasopressin cells also responded linearly to intravenous infusions of hypertonic saline but with much lower slopes. The linearity of response was surprising, given both the expected nonlinearity of neuronal behavior and the nonlinearity of the oxytocin secretory response to such infusions. We show that a simple computational model can reproduce these responses well, but only if it is assumed that hypertonic infusions coactivate excitatory and inhibitory synaptic inputs. This hypothesis was tested first by applying the GABA(A) antagonist bicuculline to the dendritic zone of the supraoptic nucleus by microdialysis. During local blockade of GABA inputs, the response of oxytocin cells to hypertonic infusion was greatly enhanced. We then went on to directly measure GABA release in the supraoptic nucleus during hypertonic infusion, confirming the predicted rise. Together, the results suggest that hypertonic infusions lead to coactivation of excitatory and inhibitory inputs and that this coactivation may confer appropriate characteristics on the output behavior of oxytocin cells. The nonlinearity of oxytocin secretion that accompanies the linear increase in oxytocin cell firing rate reflects frequency-facilitation of stimulus-secretion coupling at the neurohypophysis.
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Affiliation(s)
- G Leng
- Department of Biomedical Sciences, University Medical School, Edinburgh EH8 9XD, United Kingdom.
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Abstract
Vasopressin is emerging as a rational therapy for the hemodynamic support of septic shock and vasodilatory shock due to systemic inflammatory response syndrome. The goal of this review is to understand the physiology of vasopressin relevant to septic shock in order to maximize its safety and efficacy in clinical trials and in subsequent therapeutic use. Vasopressin is both a vasopressor and an antidiuretic hormone. It also has hemostatic, GI, and thermoregulatory effects, and is an adrenocorticotropic hormone secretagogue. Vasopressin is released from the axonal terminals of magnocellular neurons in the hypothalamus. Vasopressin mediates vasoconstriction via V1-receptor activation on vascular smooth muscle and mediates its antidiuretic effect via V2-receptor activation in the renal collecting duct system. In addition, vasopressin, at low plasma concentrations, mediates vasodilation in coronary, cerebral, and pulmonary arterial circulations. Septic shock causes first a transient early increase in blood vasopressin concentrations that decrease later in septic shock to very low levels compared to other causes of hypotension. Vasopressin infusion of 0.01 to 0.04 U/min in patients with septic shock increases plasma vasopressin levels to those observed in patients with hypotension from other causes, such as cardiogenic shock. Increased vasopressin levels are associated with a lesser need for other vasopressors. Urinary output may increase, and pulmonary vascular resistance may decrease. Infusions of > 0.04 U/min may lead to adverse, likely vasoconstriction-mediated events. Because clinical studies have been relatively small, focused on physiologic end points, and because of potential adverse effects of vasopressin, clinical use of vasopressin should await a randomized controlled trial of its effects on clinical outcomes such as organ failure and mortality.
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Affiliation(s)
- C L Holmes
- University of British Columbia Program of Critical Care Medicine and the McDonald Research Laboratories, St. Paul's Hospital, Vancouver, British Columbia, Canada
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