1
|
Blair PW, Kortepeter MG, Downey LG, Madar CS, Downs IL, Martins KA, Rossi F, Williams JA, Madar A, Schellhase CW, Bearss JJ, Zeng X, Bavari S, Soloveva V, Wells JB, Stuthman KS, Garza NL, Vantongeren SA, Donnelly GC, Steffens J, Kalapaca J, Wiseman P, Henry J, Marko S, Chappell M, Lugo-Roman L, Ramos-Rivera E, Hofer C, Blue E, Moore J, Fiallos J, Wetzel D, Pratt WD, Unangst T, Miller A, Sola JJ, Reisler RB, Cardile AP. Intensive Care Unit-Like Care of Nonhuman Primates with Ebola Virus Disease. J Infect Dis 2021; 224:632-642. [PMID: 33367826 PMCID: PMC8366444 DOI: 10.1093/infdis/jiaa781] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 12/18/2020] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND Ebola virus disease (EVD) supportive care strategies are largely guided by retrospective observational research. This study investigated the effect of EVD supportive care algorithms on duration of survival in a controlled nonhuman primate (NHP) model. METHODS Fourteen rhesus macaques were challenged intramuscularly with a target dose of Ebola virus (1000 plaque-forming units; Kikwit). NHPs were allocated to intensive care unit (ICU)-like algorithms (n = 7), intravenous fluids plus levofloxacin (n = 2), or a control group (n = 5). The primary outcome measure was duration of survival, and secondary outcomes included changes in clinical laboratory values. RESULTS Duration of survival was not significantly different between the pooled ICU-like algorithm and control groups (8.2 vs 6.9 days of survival; hazard ratio; 0.50; P = .25). Norepinephrine was effective in transiently maintaining baseline blood pressure. NHPs treated with ICU-like algorithms had delayed onset of liver and kidney injury. CONCLUSIONS While an obvious survival difference was not observed with ICU-like care, clinical observations from this model may aid in EVD supportive care NHP model refinement.
Collapse
Affiliation(s)
- Paul W Blair
- Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Austere Environments Consortium for Enhanced Sepsis Outcomes, Henry M. Jackson Foundation, Bethesda, Maryland, USA
| | | | - Lydia G Downey
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | | | - Isaac L Downs
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Karen A Martins
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Franco Rossi
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Janice A Williams
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Annie Madar
- Tripler Army Medical Center, Honolulu, Hawaii, USA
| | | | - Jeremy J Bearss
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Xiankun Zeng
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Sina Bavari
- Edge BioInnovation Consulting and Management, Frederick, Maryland, USA
| | - Veronica Soloveva
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Jay B Wells
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Kelly S Stuthman
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Nicole L Garza
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Sean A Vantongeren
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Ginger C Donnelly
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Jesse Steffens
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Jennifer Kalapaca
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Perry Wiseman
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Joseph Henry
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Shannon Marko
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Mark Chappell
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Luis Lugo-Roman
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Elliot Ramos-Rivera
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Christian Hofer
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Eugene Blue
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Joshua Moore
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Jimmy Fiallos
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Darrel Wetzel
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - William D Pratt
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Tami Unangst
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Adele Miller
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - James J Sola
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Ronald B Reisler
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| | - Anthony P Cardile
- Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland, USA
| |
Collapse
|
2
|
Chappell M, Zhu X, Pirro N, Tallant A, Gallagher P. Urolithin A, a Product of the Microbiome, Attenuates the Palmitate‐TLR4 Inflammatory Pathway in Renal Tubule Cells. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.01776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
3
|
Wong A, Glogolia M, Lange PW, Dale S, Chappell M, Soosay Raj T, Hanna D, Devaraja L, Williams C, Williamson J, Conyers R. A nurse-led paediatric oncology fast-track clinic proves a successful ambulatory intervention for patients. Support Care Cancer 2020; 28:4395-4403. [PMID: 31919665 DOI: 10.1007/s00520-019-05250-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Accepted: 12/16/2019] [Indexed: 11/25/2022]
Abstract
AIM To assess the impact of a pilot nurse-led paediatric oncology fast-track clinic (OFTC) for complications and side effects following chemotherapy within a paediatric tertiary hospital. METHODS Prospective clinical data from the first 100 patients seen in the OFTC were compared with retrospective data of oncology patient presentations to the emergency department (ED) (over a 1-year period, n = 196) who would have been eligible for review in the OFTC. Parent and patient satisfaction of clinical care were also assessed via surveys pre- and post-OFTC implementation. RESULTS Analysis which achieved statistical difference was a reduction in the number of blood tubes taken in OFTC (average 1.9 for those discharged from clinic, 2.9 for those admitted from clinic) in comparison to those seen in the ED (average 3.2) (p = 0.0027). The average number of interventions per patient seen in the ED were 2.1 (standard deviation 1.64) compared with 1.7 (standard deviation 1.55) interventions per patient seen in the OFTC, and who were not admitted following review. This result approached statistical significance with p = 0.0963. Other results which did not meet statistical significance included a reduction in treatment times, hospital admissions and medical oncology reviews. CONCLUSION Our pilot study implementing an OFTC for the triage and assessment of chemotherapy-related complications has proven successful from an operational and consumer perspective. The clinic improved care by ensuring expedited review, more streamlined interventions, and less overall hospital admissions. The improvements in efficiency were also mirrored by increased parent and patient satisfaction.
Collapse
Affiliation(s)
- A Wong
- The Children's Cancer Centre, The Royal Children's Hospital, Melbourne, Australia
| | - M Glogolia
- The Children's Cancer Centre, The Royal Children's Hospital, Melbourne, Australia
| | - P W Lange
- Department of Medicine, Melbourne University, Melbourne, Australia
| | - S Dale
- The Children's Cancer Centre, The Royal Children's Hospital, Melbourne, Australia
| | - M Chappell
- The Children's Cancer Centre, The Royal Children's Hospital, Melbourne, Australia
| | - T Soosay Raj
- The Children's Cancer Centre, The Royal Children's Hospital, Melbourne, Australia
| | - D Hanna
- The Children's Cancer Centre, The Royal Children's Hospital, Melbourne, Australia
| | - L Devaraja
- Department of Paediatrics, Melbourne University, Melbourne, Australia
| | - C Williams
- The Children's Cancer Centre, The Royal Children's Hospital, Melbourne, Australia.,The Paediatric Integrated Cancer Service (PICS), Melbourne, Australia
| | - J Williamson
- The Paediatric Integrated Cancer Service (PICS), Melbourne, Australia
| | - R Conyers
- The Children's Cancer Centre, The Royal Children's Hospital, Melbourne, Australia. .,Department of Paediatrics, Melbourne University, Melbourne, Australia. .,Murdoch Children's Research Institute, Melbourne, Australia.
| |
Collapse
|
4
|
Kanjanapan Y, Day D, Butler MO, Wang L, Joshua AM, Hogg D, Leighl NB, Razak ARA, Hansen AR, Boujos S, Chappell M, Chow K, Sherwin B, Stayner LA, Soultani L, Zambrana A, Siu LL, Bedard PL, Spreafico A. Delayed immune-related adverse events in assessment for dose-limiting toxicity in early phase immunotherapy trials. Eur J Cancer 2018; 107:1-7. [PMID: 30529898 DOI: 10.1016/j.ejca.2018.10.017] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 10/29/2018] [Accepted: 10/31/2018] [Indexed: 01/14/2023]
Abstract
BACKGROUND Immunotherapy (IO) agents can cause late-onset immune-related adverse events (irAEs). In phase I trials, observation for dose-limiting toxicities (DLTs) is typically limited to the first cycle. The incidence of delayed-onset DLTs and their potential impact on dose determination have not been fully elucidated. PATIENTS AND METHODS Consecutive patients enrolled in early phase IO trials at Princess Margaret Cancer Centre between August 2012 and September 2016 were retrospectively reviewed, applying trial-specific definitions for DLTs. A clinically significant AE (csAE) was defined as a treatment-related adverse event requiring corticosteroids, hormone replacement, IO delay or discontinuation. RESULTS A total of 352 consecutive trial enrolments in 21 early phase clinical trials were included. Two-hundred seventy-eight patients (79%) received monotherapy and 74 (21%) received combination IO. Two hundred sixty (74%) patients experienced irAEs. There were two protocol-defined DLTs. Twenty (5.7%) patients had 24 csAEs qualifying as DLTs except for occurrence after the protocol-specified DLT period. One-hundred and six (10%) of irAEs were csAEs, including endocrine (26%), respiratory (14%), gastrointestinal (11%), general (10%), dermatological (8%), hepatic (8%), musculoskeletal (6%), pancreatic (6%), haematological, metabolic, neurological, cardiac (each 2%), infective and ocular (each 1%) events. The highest risk of first-onset csAE was during the first 4 weeks compared with the period from 4 weeks to end of treatment (odds ratio 3.13, 95% confidence interval 1.95-5.02). The median time to first onset csAE was significantly shorter with combination than monotherapy IO (32 vs. 146 days, P < 0.001). CONCLUSIONS In our series of early phase IO trials, the risk of csAE was highest during the initial 4 weeks on IO treatment, supporting the use of the conventional DLT period for dose escalation decision. However, there were 24 clinically significant late-onset DLTs in 5.7% of patients. Combination IO was associated with greater risk of and also earlier onset for csAE, which may need to be considered for early phase trial design.
Collapse
Affiliation(s)
- Y Kanjanapan
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Department of Medicine, University of Toronto, Toronto, Canada; Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - D Day
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Department of Medicine, University of Toronto, Toronto, Canada; Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - M O Butler
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Department of Medicine, University of Toronto, Toronto, Canada; Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - L Wang
- Biostatistics Department, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - A M Joshua
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Department of Medicine, University of Toronto, Toronto, Canada; Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - D Hogg
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Department of Medicine, University of Toronto, Toronto, Canada; Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - N B Leighl
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Department of Medicine, University of Toronto, Toronto, Canada; Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - A R Abdul Razak
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Department of Medicine, University of Toronto, Toronto, Canada; Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - A R Hansen
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Department of Medicine, University of Toronto, Toronto, Canada; Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - S Boujos
- Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - M Chappell
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - K Chow
- Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - B Sherwin
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - L-A Stayner
- Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - L Soultani
- Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - A Zambrana
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - L L Siu
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Department of Medicine, University of Toronto, Toronto, Canada; Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - P L Bedard
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada
| | - A Spreafico
- Division of Medical Oncology and Hematology, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada; Department of Medicine, University of Toronto, Toronto, Canada; Drug Development Program, Princess Margaret Cancer Centre, University Health Network, Toronto, Canada.
| |
Collapse
|
5
|
Chappell M, Kobayashi K, Durwas K, Zhang D, Shapiro O, Karmel M. Abstract No. 572 Renal access for repeat percutaneous nephrolithotomy in patients with recurrent kidney stones: feasibility, safety and endourologic procedure outcomes. J Vasc Interv Radiol 2018. [DOI: 10.1016/j.jvir.2018.01.617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
6
|
Kobayashi K, Skummer P, Chappell M, Zhang D, Shapiro O, Karmel M. Abstract No. 570 Nephroureteral access prior to percutaneous nephrolithotomy for staghorn calculi: comparative study with non-staghorn calculi on feasibility, safety, and surgical outcomes. J Vasc Interv Radiol 2018. [DOI: 10.1016/j.jvir.2018.01.615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
|
7
|
Sodhi CP, Wohlford-Lenane C, Yamaguchi Y, Prindle T, Fulton WB, Wang S, McCray PB, Chappell M, Hackam DJ, Jia H. Attenuation of pulmonary ACE2 activity impairs inactivation of des-Arg 9 bradykinin/BKB1R axis and facilitates LPS-induced neutrophil infiltration. Am J Physiol Lung Cell Mol Physiol 2017; 314:L17-L31. [PMID: 28935640 DOI: 10.1152/ajplung.00498.2016] [Citation(s) in RCA: 250] [Impact Index Per Article: 35.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Angiotensin-converting enzyme 2 (ACE2) is a terminal carboxypeptidase with important functions in the renin-angiotensin system and plays a critical role in inflammatory lung diseases. ACE2 cleaves single-terminal residues from several bioactive peptides such as angiotensin II. However, few of its substrates in the respiratory tract have been identified, and the mechanism underlying the role of ACE2 in inflammatory lung disease has not been fully characterized. In an effort to identify biological targets of ACE2 in the lung, we tested its effects on des-Arg9 bradykinin (DABK) in airway epithelial cells on the basis of the hypothesis that DABK is a biological substrate of ACE2 in the lung and ACE2 plays an important role in the pathogenesis of acute lung inflammation partly through modulating DABK/bradykinin receptor B1 (BKB1R) axis signaling. We found that loss of ACE2 function in mouse lung in the setting of endotoxin inhalation led to activation of the DABK/BKB1R axis, release of proinflammatory chemokines such as C-X-C motif chemokine 5 (CXCL5), macrophage inflammatory protein-2 (MIP2), C-X-C motif chemokine 1 (KC), and TNF-α from airway epithelia, increased neutrophil infiltration, and exaggerated lung inflammation and injury. These results indicate that a reduction in pulmonary ACE2 activity contributes to the pathogenesis of lung inflammation, in part because of an impaired ability to inhibit DABK/BKB1R axis-mediated signaling, resulting in more prompt onset of neutrophil infiltration and more severe inflammation in the lung. Our study identifies a biological substrate of ACE2 within the airways, as well as a potential new therapeutic target for inflammatory diseases.
Collapse
Affiliation(s)
- Chhinder P Sodhi
- Division of Pediatric Surgery, Department of Surgery, Johns Hopkins University , Baltimore, Maryland
| | | | - Yukihiro Yamaguchi
- Division of Pediatric Surgery, Department of Surgery, Johns Hopkins University , Baltimore, Maryland
| | - Thomas Prindle
- Division of Pediatric Surgery, Department of Surgery, Johns Hopkins University , Baltimore, Maryland
| | - William B Fulton
- Division of Pediatric Surgery, Department of Surgery, Johns Hopkins University , Baltimore, Maryland
| | - Sanxia Wang
- Division of Pediatric Surgery, Department of Surgery, Johns Hopkins University , Baltimore, Maryland
| | - Paul B McCray
- Department of Pediatrics, Carver College of Medicine, The University of Iowa , Iowa City, Iowa
| | - Mark Chappell
- Hypertension and Vascular Research Center, Wake Forest School of Medicine , Winston-Salem, North Carolina
| | - David J Hackam
- Division of Pediatric Surgery, Department of Surgery, Johns Hopkins University , Baltimore, Maryland
| | - Hongpeng Jia
- Division of Pediatric Surgery, Department of Surgery, Johns Hopkins University , Baltimore, Maryland
| |
Collapse
|
8
|
Bi J, Su Y, Chappell M, Rose J. Abstract P324: Reduction in Excreted Sodium Load in Obese Sheep: Role of Antenatal Betamethasone and Sex. Hypertension 2016. [DOI: 10.1161/hyp.68.suppl_1.p324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Our previous studies have demonstrated the programmed impairment of sodium excretion in lean antenatal betamethasone exposed sheep whereby the males exhibited blunted excretion of a sodium load when compared to control males or control or antenatal betamethasone exposed females. Obesity has been recognized as a risk factor for developing early stage kidney failure in individuals exposed to unfavorable intrauterine conditions by virtue of fetal programming. We hypothesize that obesity (second hit) can accentuate the impairment of sodium excretion in antenatal betamethasone exposed offspring in a sex specific manner.
Pregnant ewes received either betamethasone or vehicle at 80-81 days gestation. The male (n=6 per group) or female (n=5 per group) offspring were overfed to become obese (40% weight gain over a course of 3 months) at age of 1.5 years. Acute sodium load (sodium chloride: 0.13g/kg) was administrated intravenously. Sodium excretion (excreted sodium load), blood pressure (BP), renal plasma flow (RPF), and glomerular filtration rate (GFR) were measured. Data for sodium excretion are expressed as percentage of excreted sodium load. ANOVA and Student’s t test were used for data analysis.
The excreted sodium load was lower in obese male antenatal betamethasone exposed offspring (OMB) than in obese male vehicle exposed offspring (OMV) (13.5±3.1% vs. 33.2±9.9% p=0.04). However, the excreted sodium load was not significantly different between obese female antenatal betamethasone exposed offspring (OFB) and obese female vehicle exposed offspring (OFV) (60.4±6.2% vs. 72.0±8.2%, p=0.31). Compared male offspring with female offspring, the excreted sodium load was lower in male offspring (33.2±9.9% vs. 72.0±8.2%, p=0.001, OMV vs. OFV; 13.5±3.2% vs. 60.4±6.2%, p<0.0001, OMB vs. OFB). During the experiments BP, RPF and GFR did not change significantly. .
These data suggest that obesity, acting as a second hit, accentuates impairment of sodium excretion in antenatal betamethasone exposed male but not female offspring. Thus the sex specific effect of antenatal betamethasone on sodium excretion persists in in animals experiencing a secondary insult of obesity in adulthood.
Collapse
Affiliation(s)
- Jianli Bi
- Wake Forest Univ Sch of Medicine, Winston Salem, NC
| | - Yixin Su
- Wake Forest Univ Sch of Medicine, Winston Salem, NC
| | | | - James Rose
- Wake Forest Univ Sch of Medicine, Winston Salem, NC
| |
Collapse
|
9
|
Koch A, Gulani J, King G, Hieber K, Chappell M, Ossetrova N. Establishment of Early Endpoints in Mouse Total-Body Irradiation Model. PLoS One 2016; 11:e0161079. [PMID: 27579862 PMCID: PMC5007026 DOI: 10.1371/journal.pone.0161079] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 07/29/2016] [Indexed: 01/31/2023] Open
Abstract
Acute radiation sickness (ARS) following exposure to ionizing irradiation is characterized by radiation-induced multiorgan dysfunction/failure that refers to progressive dysfunction of two or more organ systems, the etiological agent being radiation damage to cells and tissues over time. Radiation sensitivity data on humans and animals has made it possible to describe the signs associated with ARS. A mouse model of total-body irradiation (TBI) has previously been developed that represents the likely scenario of exposure in the human population. Herein, we present the Mouse Intervention Scoring System (MISS) developed at the Veterinary Sciences Department (VSD) of the Armed Forces Radiobiology Research Institute (AFRRI) to identify moribund mice and decrease the numbers of mice found dead, which is therefore a more humane refinement to death as the endpoint. Survival rates were compared to changes in body weights and temperatures in the mouse (CD2F1 male) TBI model (6–14 Gy, 60Co γ-rays at 0.6 Gy min-1), which informed improvements to the Scoring System. Individual tracking of animals via implanted microchips allowed for assessment of criteria based on individuals rather than by group averages. From a total of 132 mice (92 irradiated), 51 mice were euthanized versus only four mice that were found dead (7% of non-survivors). In this case, all four mice were found dead after overnight periods between observations. Weight loss alone was indicative of imminent succumbing to radiation injury, however mice did not always become moribund within 24 hours while having weight loss >30%. Only one survivor had a weight loss of greater than 30%. Temperature significantly dropped only 2–4 days before death/euthanasia in 10 and 14 Gy animals. The score system demonstrates a significant refinement as compared to using subjective assessment of morbidity or death as the endpoint for these survival studies.
Collapse
Affiliation(s)
- Amory Koch
- Veterinary Science Department, Armed Forces Radiobiology Research Institute (AFRRI) Uniformed Services University (USU), Bethesda, Maryland, United States of America
- * E-mail:
| | - Jatinder Gulani
- Veterinary Science Department, Armed Forces Radiobiology Research Institute (AFRRI) Uniformed Services University (USU), Bethesda, Maryland, United States of America
- The Henry M. Jackson Foundation, Bethesda, Maryland, United States of America
| | - Gregory King
- Scientific Research Department, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University (USU), Bethesda, Maryland, United States of America
| | - Kevin Hieber
- The Henry M. Jackson Foundation, Bethesda, Maryland, United States of America
- Scientific Research Department, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University (USU), Bethesda, Maryland, United States of America
| | - Mark Chappell
- Veterinary Science Department, Armed Forces Radiobiology Research Institute (AFRRI) Uniformed Services University (USU), Bethesda, Maryland, United States of America
| | - Natalia Ossetrova
- Scientific Research Department, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University (USU), Bethesda, Maryland, United States of America
| |
Collapse
|
10
|
Moroni M, Port M, Gulani J, Chappell M, Abend M. Significance of Bioindicators for Early Predictions on Diagnosis and Therapy of Irradiated Minipigs. Health Phys 2016; 111:160-168. [PMID: 27356060 DOI: 10.1097/hp.0000000000000456] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Decisions on whether to start a therapeutic intervention for management of the Acute Radiation Syndrome (ARS) should be made early after exposure, and it should be based on readily available clinical signs and laboratory parameters. Here, the authors use the minipig to assess if early prediction of the later developing clinical outcome and necessity of therapeutic interventions can be determined within the first 3 d after exposure and whether it is comparable to human data. Retrospective analysis of data accumulated in the period 2009-2012 was used. Male Göttingen minipigs (age 4-5 mo, weight 9-10 kg) were irradiated (or sham-irradiated) bilaterally with gamma-photons (Co, 0.5-0.6 Gy min) in the dose range of 1.6-12 Gy. Complete blood counts, serum chemistry, and clinical symptoms were collected up to 60 d after irradiation in untreated minipigs. Changes in these early parameters (up to 3 d after exposure) were correlated with later occurrence (10-60 d after irradiation) of (1) hematological severity scores, (2) severe thrombocytopenia, (3) severe neutropenia, as well as need for (4) therapeutic intervention, (5) administration of cytokines/antibiotics, or (6) thrombocyte transfusions. Binary endpoints were analyzed using logistic regression analysis and calculating receiver operating characteristic (ROC) curves. Most predictive were decreased lymphocyte counts and increases in body temperature at 3 h after irradiation. These data corroborate earlier findings performed on human radiation victims suffering from severe hematological syndrome and provide further evidence for the suitability of the minipig model as a potential alternative non-rodent animal model.
Collapse
Affiliation(s)
- Maria Moroni
- *Radiation Countermeasures Program, Armed Forces Radiobiology Research Institute, Uniformed Services University of the Health Sciences, Bethesda, MD; †Bundeswehr Institute of Radiobiology affiliated to the University Ulm, Munich, Germany; ‡The Henry M. Jackson Foundation, Bethesda, MD 20817; §Veterinary Science Department, Armed Forces Radiobiology Research Institute, Uniformed Services University of the Health Sciences, Bethesda MD
| | | | | | | | | |
Collapse
|
11
|
Boger E, Evans N, Chappell M, Lundqvist A, Ewing P, Wigenborg A, Fridén M. Systems Pharmacology Approach for Prediction of Pulmonary and Systemic Pharmacokinetics and Receptor Occupancy of Inhaled Drugs. CPT Pharmacometrics Syst Pharmacol 2016; 5:201-10. [PMID: 27104089 PMCID: PMC4834131 DOI: 10.1002/psp4.12074] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 02/08/2016] [Accepted: 02/25/2016] [Indexed: 01/15/2023]
Abstract
Pulmonary drug disposition after inhalation is complex involving mechanisms, such as regional drug deposition, dissolution, and mucociliary clearance. This study aimed to develop a systems pharmacology approach to mechanistically describe lung disposition in rats and thereby provide an integrated understanding of the system. When drug‐ and formulation‐specific properties for the poorly soluble drug fluticasone propionate were fed into the model, it proved predictive of the pharmacokinetics and receptor occupancy after intravenous administration and nose‐only inhalation. As the model clearly distinguishes among drug‐specific, formulation‐specific, and system‐specific properties, it was possible to identify key determinants of pulmonary selectivity of receptor occupancy of inhaled drugs: slow particle dissolution and slow drug‐receptor dissociation. Hence, it enables assessment of factors for lung targeting, including molecular properties, formulation, as well as the physiology of the animal species, thereby providing a general framework for rational drug design and facilitated translation of lung targeting from animal to man.
Collapse
Affiliation(s)
- E Boger
- Department of Respiratory, Inflammation, and Autoimmunity Innovative Medicines, AstraZeneca R&D, Mölndal, Sweden.,School of Engineering, University of Warwick, Coventry, UK
| | - N Evans
- School of Engineering, University of Warwick, Coventry, UK
| | - M Chappell
- School of Engineering, University of Warwick, Coventry, UK
| | - A Lundqvist
- Department of Respiratory, Inflammation, and Autoimmunity Innovative Medicines, AstraZeneca R&D, Mölndal, Sweden
| | - P Ewing
- Department of Respiratory, Inflammation, and Autoimmunity Innovative Medicines, AstraZeneca R&D, Mölndal, Sweden
| | - A Wigenborg
- Department of Respiratory, Inflammation, and Autoimmunity Innovative Medicines, AstraZeneca R&D, Mölndal, Sweden
| | - M Fridén
- Department of Respiratory, Inflammation, and Autoimmunity Innovative Medicines, AstraZeneca R&D, Mölndal, Sweden.,Translational PKPD, Department of Pharmaceutical Biosciences, Uppsala University, Uppsala, Sweden
| |
Collapse
|
12
|
Kennedy AJ, Hull MS, Diamond S, Chappell M, Bednar AJ, Laird JG, Melby NL, Steevens JA. Gaining a Critical Mass: A Dose Metric Conversion Case Study Using Silver Nanoparticles. Environ Sci Technol 2015; 49:12490-12499. [PMID: 26375160 DOI: 10.1021/acs.est.5b03291] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Mass concentration is the standard convention to express exposure in ecotoxicology for dissolved substances. However, nanotoxicology has challenged the suitability of the mass concentration dose metric. Alternative metrics often discussed in the literature include particle number, surface area, and ion release (kinetics, equilibrium). It is unlikely that any single metric is universally applicable to all types of nanoparticles. However, determining the optimal metric for a specific type of nanoparticle requires novel studies to generate supportive data and employ methods to compensate for current analytical capability gaps. This investigation generated acute toxicity data for two standard species (Ceriodaphnia dubia, Pimephales promelas) exposed to five sizes (10, 20, 30, 60, 100 nm) of monodispersed citrate- and polyvinylpyrrolidone-coated silver nanoparticles. Particles were sized by various techniques to populate available models for expressing the particle number, surface area, and dissolved fraction. Results indicate that the acute toxicity of the tested silver nanoparticles is best expressed by ion release, and is relatable to total exposed surface area. Particle number was not relatable to the observed acute silver nanoparticle effects.
Collapse
Affiliation(s)
- Alan J Kennedy
- U.S. Army Engineer Research and Development Center , Environmental Laboratory, Vicksburg, Mississippi 39180, United States
| | - Matthew S Hull
- Virginia Tech Institute for Critical Technology and Applied Science (ICTAS) , Blacksburg, Virginia 24060, United States
- NanoSafe, Inc. , Blacksburg, Virginia 24060, United States
| | | | - Mark Chappell
- U.S. Army Engineer Research and Development Center , Environmental Laboratory, Vicksburg, Mississippi 39180, United States
| | - Anthony J Bednar
- U.S. Army Engineer Research and Development Center , Environmental Laboratory, Vicksburg, Mississippi 39180, United States
| | - Jennifer G Laird
- U.S. Army Engineer Research and Development Center , Environmental Laboratory, Vicksburg, Mississippi 39180, United States
| | - Nicholas L Melby
- U.S. Army Engineer Research and Development Center , Environmental Laboratory, Vicksburg, Mississippi 39180, United States
| | - Jeffery A Steevens
- U.S. Army Engineer Research and Development Center , Environmental Laboratory, Vicksburg, Mississippi 39180, United States
| |
Collapse
|
13
|
Su Y, Pulgar VM, Bi J, Chappell M, Rose JC. Abstract P169: Antenatal Betamethasone Attenuates the Angiotensin-(1-7)/Nitric Oxide Axis in Adult Male but not Female Renal Proximal Tubule Cells. Hypertension 2015. [DOI: 10.1161/hyp.66.suppl_1.p169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Our studies have revealed a sex-specific effect of fetal programming on sodium (Na+) excretion in adult sheep whereby the males exhibit reduced Na+ excretion and an attenuated natriuretic response to Ang-(1-7) as compared to the females. We hypothesize that the renal proximal tubules are a key target for the early programming effects of glucocorticoids exposure to regulate Na+ handling in the adult males. Therefore, we isolated and cultured cortical proximal tubule cells (RPTC) from adult male and female sheep antenatally exposed to betamethasone (Beta) or vehicle. Na+ uptake and nitric oxide (NO) were assessed with Sodium Green and DAF fluorescence prior to and following a low dose of Ang-(1-7) (1x10-11 M) in isolated RPTC from sheep at ~1.5 years of age. Data are expressed as % of basal uptake or area under the curve (AUC) for Na+ or % of control for NO. Male Beta RPTC exhibit greater Na+ uptake than male vehicle cells (427±32%, n=13, vs. 315±28%, n=14, p<0.05; however, Beta had no effect on Na+ uptake in the female cells (242±18%, n=9, vs. 250±15%, n=10, p>0.05). Ang-(1-7) inhibited Na+ uptake in RPTC from vehicle male (255±40%) and from both vehicle (191±14%) and Beta (209±11%) females (Figure 1B), but failed to attenuate Na+ uptake in Beta male cells (Figure 1A). Beta exposure also abolished NO stimulation by Ang-(1-7) in male but not female RPTC (Figure 1C). We conclude that an Ang-(1-7)-NO-dependent pathway contributes to the sex-dependent consequences of programming on Na+ regulation in the proximal tubules of the kidney. Moreover, the RPTC retain both the sex and Beta-induced phenotype of the adult and may reflect an appropriate cell model of fetal programming.
Collapse
Affiliation(s)
- Yixin Su
- Wake Forest Sch of Medicine, Winston Salem, NC
| | | | - Jianli Bi
- Wake Forest Sch of Medicine, Winston Salem, NC
| | | | | |
Collapse
|
14
|
Su Y, Bi J, Pulgar VM, Figueroa J, Chappell M, Rose JC. Antenatal glucocorticoid treatment alters Na+ uptake in renal proximal tubule cells from adult offspring in a sex-specific manner. Am J Physiol Renal Physiol 2015; 308:F1268-75. [PMID: 25834069 DOI: 10.1152/ajprenal.00047.2015] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Accepted: 03/29/2015] [Indexed: 01/01/2023] Open
Abstract
We have shown a sex-specific effect of fetal programming on Na(+) excretion in adult sheep. The site of this effect in the kidney is unknown. Therefore, we tested the hypothesis that renal proximal tubule cells (RPTCs) from adult male sheep exposed to betamethasone (Beta) before birth have greater Na(+) uptake than do RPTCs from vehicle-exposed male sheep and that RPTCs from female sheep similarly exposed are not influenced by antenatal Beta. In isolated RPTCs from 1- to 1.5-yr-old male and female sheep, we measured Na(+) uptake under basal conditions and after stimulation with ANG II. To gain insight into the mechanisms involved, we also measured nitric oxide (NO) levels, ANG II receptor mRNA levels, and expression of Na(+)/H(+) exchanger 3. Basal Na(+) uptake increased more in cells from Beta-exposed male sheep than in cells from vehicle-exposed male sheep (400% vs. 300%, P < 0.00001). ANG II-stimulated Na(+) uptake was also greater in cells from Beta-exposed males. Beta exposure did not increase Na(+) uptake by RPTCs from female sheep. NO production was suppressed more by ANG II in RPTCs from Beta-exposed males than in RPTCs from either vehicle-exposed male or female sheep. Our data suggest that one site of the sex-specific effect of Beta-induced fetal programming in the kidney is the RPTC and that the enhanced Na(+) uptake induced by antenatal Beta in male RPTCs may be related to the suppression of NO in these cells.
Collapse
Affiliation(s)
- Yixin Su
- Department of Obstetrics and Gynecology, Wake Forest School of Medicine, Winston-Salem, North Carolina; Center of Research for Obstetrics and Gynecology, Wake Forest School of Medicine, Winston-Salem, North Carolina; and
| | - Jianli Bi
- Department of Obstetrics and Gynecology, Wake Forest School of Medicine, Winston-Salem, North Carolina; Center of Research for Obstetrics and Gynecology, Wake Forest School of Medicine, Winston-Salem, North Carolina; and
| | - Victor M Pulgar
- Department of Obstetrics and Gynecology, Wake Forest School of Medicine, Winston-Salem, North Carolina; Center of Research for Obstetrics and Gynecology, Wake Forest School of Medicine, Winston-Salem, North Carolina; and
| | - Jorge Figueroa
- Department of Obstetrics and Gynecology, Wake Forest School of Medicine, Winston-Salem, North Carolina; Center of Research for Obstetrics and Gynecology, Wake Forest School of Medicine, Winston-Salem, North Carolina; and
| | - Mark Chappell
- Hypertension Center, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - James C Rose
- Department of Obstetrics and Gynecology, Wake Forest School of Medicine, Winston-Salem, North Carolina; Center of Research for Obstetrics and Gynecology, Wake Forest School of Medicine, Winston-Salem, North Carolina; and
| |
Collapse
|
15
|
Bi J, Figueroa J, Chappell M, Rose J. Effect of Antenatal Betamethasone on Ovine Renal Function in Obese Offspring. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.lb762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jianli Bi
- Department of Obstetrics & Gynecology Wake Forest University School of MedicineUnited States
| | - Jorge Figueroa
- Department of Obstetrics & Gynecology Wake Forest University School of MedicineUnited States
| | - Mark Chappell
- Hypertension and Vascular Research Center Wake Forest University School of MedicineUnited States
| | - James Rose
- Department of Obstetrics & Gynecology Wake Forest University School of MedicineUnited States
| |
Collapse
|
16
|
Lawson M, Figueroa J, Rose J, Chappell M, Diz D, Shaltout H. Intracerebroventricular Infusion of Angiotensin‐(1‐7) Improves Baroreflex Sensitivity in Antenatal Betamethasone Exposed Sheep. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.811.30] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Matthew Lawson
- Hypertension and Vascular Research CenterObstetrics and GynecoloyWake Forest School of MedicineWinston SalemNorth CarolinaUnited States
| | - Jorge Figueroa
- Hypertension and Vascular Research CenterObstetrics and GynecoloyWake Forest School of MedicineWinston SalemNorth CarolinaUnited States
| | - James Rose
- Hypertension and Vascular Research CenterObstetrics and GynecoloyWake Forest School of MedicineWinston SalemNorth CarolinaUnited States
| | - Mark Chappell
- Hypertension and Vascular Research CenterObstetrics and GynecoloyWake Forest School of MedicineWinston SalemNorth CarolinaUnited States
| | - Debra Diz
- Hypertension and Vascular Research CenterObstetrics and GynecoloyWake Forest School of MedicineWinston SalemNorth CarolinaUnited States
| | - Hossam Shaltout
- Hypertension and Vascular Research CenterObstetrics and GynecoloyWake Forest School of MedicineWinston SalemNorth CarolinaUnited States
| |
Collapse
|
17
|
Andrews G, Halford GS, Chappell M, Maujean A, Shum DHK. Planning following stroke: a relational complexity approach using the tower of london. Front Hum Neurosci 2014; 8:1032. [PMID: 25566042 PMCID: PMC4274981 DOI: 10.3389/fnhum.2014.01032] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Accepted: 12/08/2014] [Indexed: 11/30/2022] Open
Abstract
Planning on the 4-disk version of the Tower of London (TOL4) was examined in stroke patients and unimpaired controls. Overall TOL4 solution scores indicated impaired planning in the frontal stroke but not non-frontal stroke patients. Consistent with the claim that processing the relations between current states, intermediate states, and goal states is a key process in planning, the domain-general relational complexity metric was a good indicator of the experienced difficulty of TOL4 problems. The relational complexity metric shared variance with task-specific metrics of moves to solution and search depth. Frontal stroke patients showed impaired planning compared to controls on problems at all three complexity levels, but at only two of the three levels of moves to solution, search depth and goal ambiguity. Non-frontal stroke patients showed impaired planning only on the most difficult quaternary-relational and high search depth problems. An independent measure of relational processing (viz., Latin square task) predicted TOL4 solution scores after controlling for stroke status and location, and executive processing (Trail Making Test). The findings suggest that planning involves a domain-general capacity for relational processing that depends on the frontal brain regions.
Collapse
Affiliation(s)
- Glenda Andrews
- Behavioural Basis of Health Program, Griffith Health Institute, School of Applied Psychology, Griffith University , Gold Coast, QLD , Australia
| | - Graeme S Halford
- Behavioural Basis of Health Program, Griffith Health Institute, School of Applied Psychology, Griffith University , Brisbane, QLD , Australia
| | - Mark Chappell
- Behavioural Basis of Health Program, Griffith Health Institute, School of Applied Psychology, Griffith University , Brisbane, QLD , Australia
| | - Annick Maujean
- Centre for National Research on Disability and Rehabilitation Medicine (CONROD), Griffith Health Institute, Griffith University , Meadowbrook, QLD , Australia
| | - David H K Shum
- Behavioural Basis of Health Program, Griffith Health Institute, School of Applied Psychology, Griffith University , Brisbane, QLD , Australia
| |
Collapse
|
18
|
Elliott TB, Deutz NE, Gulani J, Koch A, Olsen CH, Christensen C, Chappell M, Whitnall MH, Moroni M. Gastrointestinal acute radiation syndrome in Göttingen minipigs (Sus scrofa domestica). Comp Med 2014; 64:456-463. [PMID: 25527026 PMCID: PMC4275081] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 07/25/2014] [Accepted: 08/14/2014] [Indexed: 06/04/2023]
Abstract
In the absence of supportive care, exposing Göttingen minipigs to γ-radiation doses of less than 2 Gy achieves lethality due to hematopoietic acute radiation syndrome. Doses of 2 to 5 Gy are associated with an accelerated hematopoietic syndrome, characterized by villus blunting and fusion, the beginning of sepsis, and a mild transient reduction in plasma citrulline concentration. We exposed male Göttingen minipigs (age, 5 mo; weight, 9 to 11 kg) to γ-radiation doses of 5 to 12 Gy (total body; (60)Co, 0.6 Gy/min) to test whether these animals exhibit classic gastrointestinal acute radiation syndrome (GI-ARS). After exposure, the minipigs were monitored for 10 d by using clinical signs, CBC counts, and parameters associated with the development of the gastrointestinal syndrome. Göttingen minipigs exposed to γ radiation of 5 to 12 Gy demonstrate a dose-dependent occurrence of all parameters classically associated with acute GI-ARS. These results suggest that Göttingen minipigs may be a suitable model for studying GI-ARS after total body irradiation, but the use of supportive care to extend survival beyond 10 d is recommended. This study is the first step toward determining the feasibility of using Göttingen minipigs in testing the efficacy of candidate drugs for the treatment of GI-ARS after total body irradiation.
Collapse
Affiliation(s)
- Thomas B Elliott
- Combined Injury Program, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
| | - Nicolaas E Deutz
- Department of Health & Kinesiology, Texas A&M University, College Station, Texas, USA
| | - Jatinder Gulani
- Veterinary Sciences Department, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
| | - Amory Koch
- Veterinary Sciences Department, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
| | - Cara H Olsen
- Department of Preventive Medicine and Biometrics, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
| | - Christine Christensen
- Division of Comparative Pathology, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
| | - Mark Chappell
- Veterinary Sciences Department, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
| | - Mark H Whitnall
- Department of Preventive Medicine and Biometrics, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
| | - Maria Moroni
- Radiation Countermeasures Program, Armed Forces Radiobiology Research Institute (AFRRI), Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA.
| |
Collapse
|
19
|
Warren TK, Trefry JC, Marko ST, Chance TB, Wells JB, Pratt WD, Johnson JC, Mucker EM, Norris SL, Chappell M, Dye JM, Honko AN. Euthanasia assessment in ebola virus infected nonhuman primates. Viruses 2014; 6:4666-82. [PMID: 25421892 PMCID: PMC4246243 DOI: 10.3390/v6114666] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 11/17/2014] [Accepted: 11/18/2014] [Indexed: 11/21/2022] Open
Abstract
Multiple products are being developed for use against filoviral infections. Efficacy for these products will likely be demonstrated in nonhuman primate models of filoviral disease to satisfy licensure requirements under the Animal Rule, or to supplement human data. Typically, the endpoint for efficacy assessment will be survival following challenge; however, there exists no standardized approach for assessing the health or euthanasia criteria for filovirus-exposed nonhuman primates. Consideration of objective criteria is important to (a) ensure test subjects are euthanized without unnecessary distress; (b) enhance the likelihood that animals exhibiting mild or moderate signs of disease are not prematurely euthanized; (c) minimize the occurrence of spontaneous deaths and loss of end-stage samples; (d) enhance the reproducibility of experiments between different researchers; and (e) provide a defensible rationale for euthanasia decisions that withstands regulatory scrutiny. Historic records were compiled for 58 surviving and non-surviving monkeys exposed to Ebola virus at the US Army Medical Research Institute of Infectious Diseases. Clinical pathology parameters were statistically analyzed and those exhibiting predicative value for survival are reported. These findings may be useful for standardization of objective euthanasia assessments in rhesus monkeys exposed to Ebola virus and may serve as a useful approach for other standardization efforts.
Collapse
Affiliation(s)
- Travis K Warren
- US Army Medical Research Institute for Infectious Diseases, 1425 Porter St., Fort Detrick, MD 21702, USA.
| | - John C Trefry
- US Army Medical Research Institute for Infectious Diseases, 1425 Porter St., Fort Detrick, MD 21702, USA.
| | - Shannon T Marko
- US Army Medical Research Institute for Infectious Diseases, 1425 Porter St., Fort Detrick, MD 21702, USA.
| | - Taylor B Chance
- US Army Medical Research Institute for Infectious Diseases, 1425 Porter St., Fort Detrick, MD 21702, USA.
| | - Jay B Wells
- US Army Medical Research Institute for Infectious Diseases, 1425 Porter St., Fort Detrick, MD 21702, USA.
| | - William D Pratt
- US Army Medical Research Institute for Infectious Diseases, 1425 Porter St., Fort Detrick, MD 21702, USA.
| | - Joshua C Johnson
- US Army Medical Research Institute for Infectious Diseases, 1425 Porter St., Fort Detrick, MD 21702, USA.
| | - Eric M Mucker
- US Army Medical Research Institute for Infectious Diseases, 1425 Porter St., Fort Detrick, MD 21702, USA.
| | - Sarah L Norris
- US Army Medical Research Institute for Infectious Diseases, 1425 Porter St., Fort Detrick, MD 21702, USA.
| | - Mark Chappell
- US Army Medical Research Institute for Infectious Diseases, 1425 Porter St., Fort Detrick, MD 21702, USA.
| | - John M Dye
- US Army Medical Research Institute for Infectious Diseases, 1425 Porter St., Fort Detrick, MD 21702, USA.
| | - Anna N Honko
- US Army Medical Research Institute for Infectious Diseases, 1425 Porter St., Fort Detrick, MD 21702, USA.
| |
Collapse
|
20
|
Mayo M, Collier ZA, Hoang V, Chappell M. Uncertainty in multi-media fate and transport models: a case study for TNT life cycle assessment. Sci Total Environ 2014; 494-495:104-112. [PMID: 25037048 DOI: 10.1016/j.scitotenv.2014.06.061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 06/05/2014] [Accepted: 06/15/2014] [Indexed: 06/03/2023]
Abstract
Life cycle assessment (LCA) is an evaluation method used by decision-makers to help assess the relative environmental impacts of various industrial processes. Despite that many LCA methods remain sensitive to uncertain input data, which can reduce the utility of their results, uncertainty arising from constituent LCA models remains poorly understood. Here, we begin to address this problem by evaluating the extent to which parameter-value uncertainty affects the SimpleBox 2.0 fate and transport model, which serves as a backbone for many LCA ecotoxicological impact categories. Two Monte Carlo type sampling methods were used to evaluate dispersion in steady-state concentration values for three chemicals involved in grenade production: toluene, 2,4-dinitrotoluene (2,4-DNT), and 2,4,6-trinitrotoluene (TNT). Parameters were first sampled stochastically one-at-a-time, then by randomly exploring a local patch of the parameter space. We confirmed that global temperatures contribute primarily to the overall variance of model results, which at most spanned approximately 8 decades in magnitude. These results are consistent with previous results obtained for the whole of the LCA method. LCA methods carry out calculations iteratively; a reduction in the error of a single component, such as the fate and transport model, may therefore improve its performance and utility as a decision-making aid.
Collapse
Affiliation(s)
- Michael Mayo
- Environmental Laboratory, US Army Engineer Research and Development Center, Vicksburg, MS, USA
| | - Zachary A Collier
- Environmental Laboratory, US Army Engineer Research and Development Center, Vicksburg, MS, USA
| | - Vu Hoang
- Department of Biosystems Engineering, Michigan State University, East Lansing, MI, USA
| | - Mark Chappell
- Environmental Laboratory, US Army Engineer Research and Development Center, Vicksburg, MS, USA.
| |
Collapse
|
21
|
Affiliation(s)
- Glenda Andrews
- Behavioural Basis of Health Program, Griffith Health Institute, Griffith UniversityAustralia
- School of Applied Psychology, Griffith University, Gold Coast CampusAustralia
| | - Graeme S. Halford
- Behavioural Basis of Health Program, Griffith Health Institute, Griffith UniversityAustralia
- School of Applied Psychology, Griffith University, Mt Gravatt CampusAustralia
| | - David H. K. Shum
- Behavioural Basis of Health Program, Griffith Health Institute, Griffith UniversityAustralia
- School of Applied Psychology, Griffith University, Mt Gravatt CampusAustralia
| | - Annick Maujean
- Behavioural Basis of Health Program, Griffith Health Institute, Griffith UniversityAustralia
- Population and Social Health Research Program, Griffith Health Institute, Griffith UniversityAustralia
| | - Mark Chappell
- Behavioural Basis of Health Program, Griffith Health Institute, Griffith UniversityAustralia
- School of Applied Psychology, Griffith University, Mt Gravatt CampusAustralia
| | | |
Collapse
|
22
|
Gwathmey T, Chappell M, Nixon P, Washburn L. Prenatal steroid exposure promotes expression of renal injury indices in African American females (1134.11). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.1134.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- TanYa Gwathmey
- Hypertension and Vascular Research Wake Forest School of MedicineWinston‐SalemNCUnited States
| | - Mark Chappell
- Hypertension and Vascular Research Wake Forest School of MedicineWinston‐SalemNCUnited States
| | - Patricia Nixon
- Health and Exercise Science Wake Forest School of MedicineWinston‐SalemNCUnited States
| | - Lisa Washburn
- Dept of Pediatrics Wake Forest School of MedicineWinston‐SalemNCUnited States
| |
Collapse
|
23
|
Marshall A, Pirro N, Rose J, Diz D, Chappell M. Evidence for an angiotensin‐(1‐7) neuropeptidase in the brain medulla of sheep (1140.6). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.1140.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Allyson Marshall
- Hypertension and Vascular Research Center Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - Nancy Pirro
- Hypertension and Vascular Research Center Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - James Rose
- Obstetrics and Gynecology Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - Debra Diz
- Hypertension and Vascular Research Center Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - Mark Chappell
- Hypertension and Vascular Research Center Wake Forest University School of Medicine WinstonSalemNCUnited States
| |
Collapse
|
24
|
Bi J, Chen K, Su Y, Chappell M, Rose J. Sex specific effect of antenatal glucocorticoids on nitric oxide production stimulated by angiotensin peptides in renal proximal tubule cells (1085.6). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.1085.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jianli Bi
- Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - Kai Chen
- Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - Yixin Su
- Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - Mark Chappell
- Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - James Rose
- Wake Forest University School of Medicine WinstonSalemNCUnited States
| |
Collapse
|
25
|
Affiliation(s)
- Bryan Wilson
- Molecular Medicine and Translational Science Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - James Rose
- Obstetrics and Gynecology Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - Mark Chappell
- Hypertension and Vascular Research Center Wake Forest University School of Medicine WinstonSalemNCUnited States
| |
Collapse
|
26
|
Wilson B, Marshall A, Pirro N, Su Y, Rose J, Chappell M. Expression of an angiotensin‐(1‐7) endopeptidase in proximal tubules of the sheep and human kidney (1088.10). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.1088.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Bryan Wilson
- Molecular Medicine and Translational Sciences Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - Allyson Marshall
- Hypertension and Vascular Research Center Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - Nancy Pirro
- Hypertension and Vascular Research Center Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - Yixin Su
- Obstetrics and Gynecology Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - James Rose
- Obstetrics and Gynecology Wake Forest University School of Medicine WinstonSalemNCUnited States
| | - Mark Chappell
- Hypertension and Vascular Research Center Wake Forest University School of Medicine WinstonSalemNCUnited States
| |
Collapse
|
27
|
Lindsey S, Liu L, Chappell M. GPER activation ameliorates vascular remodeling in salt‐sensitive mRen2.Lewis rats (867.7). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.867.7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sarah Lindsey
- Pharmacology Tulane UniversityNew OrleansLAUnited States
| | - Liu Liu
- Pharmacology Tulane UniversityNew OrleansLAUnited States
| | - Mark Chappell
- Hypertension and Vascular Research Center Wake Forest UniversityWinston‐SalemNCUnited States
| |
Collapse
|
28
|
Abstract
Previous attempts to measure localization bias around a right-angle turn (L-trajectory) have found either no spatial bias off the trajectory (Whitney, Cavanagh, & Murakami, 2000) or a bias, in different experiments, both 'inside' and 'outside' the trajectory (Nieman, Sheth, & Shimojo, 2010). However, Eagleman and Sejnowski (2007) presented data showing that the perceived location of a brief feature on two moving stimuli could be predicted from the vector sum of their directions after the feature appeared. Such a vector sum with an L-trajectory could predict that the perceived position before the turn should be biased 'sideways' off the trajectory, in the direction of the final motion. With stimuli that particularly facilitated accurate vernier judgments, and measuring bias via the flash-lag illusion, this is indeed what we observed. Our data thus favour Eagleman and Sejnowski's (2007) supposition. Further, the bias occurred before the change in direction, rather than after it, supporting the contention that it is motion after a point being sampled that affects its perception (Bachmann et al., 2003; Eagleman & Sejnowski, 2007; Krekelberg & Lappe, 2000; Nieman, Sheth, & Shimojo, 2010).
Collapse
Affiliation(s)
- Mark Chappell
- School of Applied Psychology (MG) and Applied Cognitive Neuroscience Unit, Behavioural Basis of Health, Griffith Institute of Health, Griffith University, Nathan, 4111 QLD, Australia.
| | - Jessica Hinchy
- School of Applied Psychology (MG) and Applied Cognitive Neuroscience Unit, Behavioural Basis of Health, Griffith Institute of Health, Griffith University, Nathan, 4111 QLD, Australia
| |
Collapse
|
29
|
Chappell M, Potter Z, Hine TJ, Mullen KT, Shand J. Reducing magnocellular processing of various motion trajectories tests single process theories of visual position perception. J Vis 2013; 13:13.10.16. [DOI: 10.1167/13.10.16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
30
|
Schaich C, Nautiyal M, Howlett A, Chappell M, Diz D. Enhanced CB1 Cannabinoid Receptor Tone Contributes to Impaired Baroreflex Sensitivity in Hypertensive (mRen2)27 Transgenic Rats. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.926.13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Chris Schaich
- Department of Physiology and PharmacologyWake Forest UniversityWinston‐SalemNC
- Hypertension & Vascular Research CenterWake Forest UniversityWinston‐SalemNC
| | - Manisha Nautiyal
- Hypertension & Vascular Research CenterWake Forest UniversityWinston‐SalemNC
| | - Allyn Howlett
- Department of Physiology and PharmacologyWake Forest UniversityWinston‐SalemNC
| | - Mark Chappell
- Hypertension & Vascular Research CenterWake Forest UniversityWinston‐SalemNC
| | - Debra Diz
- Hypertension & Vascular Research CenterWake Forest UniversityWinston‐SalemNC
| |
Collapse
|
31
|
Americo A, Pirro N, Brosnihan KB, Chappell M. Processing of Angiotensinogen to Angiotensin‐(1–12) by a Non‐ Renin Enzyme in the Salt‐Sensitive mRen2.Lewis Rat. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.909.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Anna Americo
- Hypertension CenterWake Forest University School of MedicineWinston‐SalemNC
| | - Nancy Pirro
- Hypertension CenterWake Forest University School of MedicineWinston‐SalemNC
| | | | - Mark Chappell
- Hypertension CenterWake Forest University School of MedicineWinston‐SalemNC
| |
Collapse
|
32
|
Bi J, Contag S, Su Y, Chen K, Figueroa J, Chappell M, Rose JC. Sex Differences in Oxidative Stress Following Uniphrectomy in Antenatal Glucocorticoid Exposed Sheep. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.733.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jianli Bi
- Wake Forest University School of MedicineWinston SalemNC
| | - Stephen Contag
- Wake Forest University School of MedicineWinston SalemNC
| | - Yixin Su
- Wake Forest University School of MedicineWinston SalemNC
| | - Kai Chen
- Wake Forest University School of MedicineWinston SalemNC
| | - Jorge Figueroa
- Wake Forest University School of MedicineWinston SalemNC
| | - Mark Chappell
- Wake Forest University School of MedicineWinston SalemNC
| | - James C. Rose
- Wake Forest University School of MedicineWinston SalemNC
| |
Collapse
|
33
|
Hakuda D, Lima R, Pirro N, Diz D, Chappell M. High Glucose Differentially Influences Endocannabinoid CB‐1 and CB‐2 Receptors in Renal Epithelial Cells. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.917.9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Debroah Hakuda
- Hypertension CenterWake Forest University School of MedicineWinston‐SalemNC
| | - Rariane Lima
- Hypertension CenterWake Forest University School of MedicineWinston‐SalemNC
| | - Nancy Pirro
- Hypertension CenterWake Forest University School of MedicineWinston‐SalemNC
| | - Debra Diz
- Hypertension CenterWake Forest University School of MedicineWinston‐SalemNC
| | - Mark Chappell
- Hypertension CenterWake Forest University School of MedicineWinston‐SalemNC
| |
Collapse
|
34
|
Andrews G, Halford GS, Shum D, Maujean A, Chappell M, Birney D. Relational processing following stroke. Brain Cogn 2013; 81:44-51. [DOI: 10.1016/j.bandc.2012.09.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 08/28/2012] [Accepted: 09/14/2012] [Indexed: 11/25/2022]
|
35
|
Americo A, Pirro N, Yamaleyeva L, Lindsey S, Chappell M. Abstract 610: A Pepstatin-Sensitive Aspartyl Peptidase as an Early Urinary Marker of Renal Injury in the Diabetic Hypertensive mRen2.Lewis Female Rat. Hypertension 2012. [DOI: 10.1161/hyp.60.suppl_1.a610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We previously reported that induction of diabetes in estrogen-depleted, hypertensive mRen2.Lewis (mRen2) female rats leads to significant albuminuria, proteinuria and tubulointerstial oxidative stress at 28 days. The current study assessed the time course for the development of proteinuria and peptidase activities in the urine of the diabetic hypertensive mRen2 to begin to establish potential biomarkers of renal injury in this model. Heterozygous mRen2 underwent ovariectomy and diabetes was induced by a single administration of streptozotocin (65 mg/kg; STZ) at 15 weeks of age. Urinary samples were taken prior to (day 0) and 5 and 28 days following STZ. Aspartyl peptidases were assayed with the quenched fluorescent substrate Mca-GWPILFFRLW(Dnp)R in the presence or absence of the inhibitor pepstatin. Enzyme activities were expressed as nmols Mca per 30 min per mg creatinine. Pepstatin-sensitive activity [IC50 ∼ 0.4 nM] was detectable in the pre-diabetic urines [26 ± 9; n=8]; however, the diabetic rats exhibited a significant increase in urinary activity at days 5 and 28 [184 ± 25 and 204 ± 53, respectively; p<0.05 vs. day 0]. In contrast, pepstatin-insensitive activity was markedly lower and decreased between days 0 and 5 [22 ± 2 vs. 12 ± 4; p<0.05], but was unchanged at day 28 [34 ± 12]. Proteinuria was similar at days 0 and day 5, but significantly increased by day 28. Aspartyl peptidases in the kidney and urine that are sensitive to pepstatin include cathepsins D and E, as well as the enzyme napsin. However, immunoblots of concentrated urine samples using selective cathepsin and napsin antibodies failed to match protein expression to the increased activities in the diabetic rats. Finally, we assessed peptidase activity in isolated cortical slices from diabetic mRen2 to determine the extent of enzyme release. Aspartyl peptidase activity was readily detectable in the perfusate of the isolated kidney [6 ± 0.3 pmols Mca per min release, n=3] and completely inhibited by pepstatin suggesting that the urinary activity is of renal origin. We conclude that a pepstatin-sensitive aspartyl peptidase, potentially distinct from cathepsin D/E and napsin may constitute an early marker of renal injury in the diabetic hypertensive mRen2 strain.
Collapse
|
36
|
Chappell M, Hawke JL. New twists for an old turning illusion. Perception 2012; 41:110-2. [PMID: 22611667 DOI: 10.1068/p7105] [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: 10/28/2022]
Abstract
A Vernier-offset illusion induced by rotating lines, introduced by Matin et al (1976 Perception & psychophysics 20 138-142) was re-examined using onset, offset, and reverse trajectories inspired by flash-lag illusion research, with both Vernier and alignment-with-vertical judgments being recorded. The pattern of illusions found was generally in agreement with a differential latency of stimulus ends account described by those authors, although certain variants of modern spatial projection theories, and a differential latency of attribute account, could also accommodate much of the data.
Collapse
Affiliation(s)
- Mark Chappell
- School of Applied Psychology (MG) and Applied Cognitive Neuroscience Unit, Griffith Health Institute, Griffith University, Nathan, QLD 4111, Australia.
| | | |
Collapse
|
37
|
Handy RD, van den Brink N, Chappell M, Mühling M, Behra R, Dušinská M, Simpson P, Ahtiainen J, Jha AN, Seiter J, Bednar A, Kennedy A, Fernandes TF, Riediker M. Practical considerations for conducting ecotoxicity test methods with manufactured nanomaterials: what have we learnt so far? Ecotoxicology 2012; 21:933-72. [PMID: 22422174 PMCID: PMC3325413 DOI: 10.1007/s10646-012-0862-y] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 01/28/2012] [Indexed: 05/18/2023]
Abstract
This review paper reports the consensus of a technical workshop hosted by the European network, NanoImpactNet (NIN). The workshop aimed to review the collective experience of working at the bench with manufactured nanomaterials (MNMs), and to recommend modifications to existing experimental methods and OECD protocols. Current procedures for cleaning glassware are appropriate for most MNMs, although interference with electrodes may occur. Maintaining exposure is more difficult with MNMs compared to conventional chemicals. A metal salt control is recommended for experiments with metallic MNMs that may release free metal ions. Dispersing agents should be avoided, but if they must be used, then natural or synthetic dispersing agents are possible, and dispersion controls essential. Time constraints and technology gaps indicate that full characterisation of test media during ecotoxicity tests is currently not practical. Details of electron microscopy, dark-field microscopy, a range of spectroscopic methods (EDX, XRD, XANES, EXAFS), light scattering techniques (DLS, SLS) and chromatography are discussed. The development of user-friendly software to predict particle behaviour in test media according to DLVO theory is in progress, and simple optical methods are available to estimate the settling behaviour of suspensions during experiments. However, for soil matrices such simple approaches may not be applicable. Alternatively, a Critical Body Residue approach may be taken in which body concentrations in organisms are related to effects, and toxicity thresholds derived. For microbial assays, the cell wall is a formidable barrier to MNMs and end points that rely on the test substance penetrating the cell may be insensitive. Instead assays based on the cell envelope should be developed for MNMs. In algal growth tests, the abiotic factors that promote particle aggregation in the media (e.g. ionic strength) are also important in providing nutrients, and manipulation of the media to control the dispersion may also inhibit growth. Controls to quantify shading effects, and precise details of lighting regimes, shaking or mixing should be reported in algal tests. Photosynthesis may be more sensitive than traditional growth end points for algae and plants. Tests with invertebrates should consider non-chemical toxicity from particle adherence to the organisms. The use of semi-static exposure methods with fish can reduce the logistical issues of waste water disposal and facilitate aspects of animal husbandry relevant to MMNs. There are concerns that the existing bioaccumulation tests are conceptually flawed for MNMs and that new test(s) are required. In vitro testing strategies, as exemplified by genotoxicity assays, can be modified for MNMs, but the risk of false negatives in some assays is highlighted. In conclusion, most protocols will require some modifications and recommendations are made to aid the researcher at the bench.
Collapse
Affiliation(s)
- Richard D Handy
- Ecotoxicology Research and Innovation Centre, School of Biomedical & Biological Sciences, University of Plymouth, Plymouth, UK.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Santiago N, Melo MB, Chappell M, Varagic J, Santos RAS, Campagnole-Santos MJ. Diabetes Abolishes the Cardioprotective Effect of Estrogen on Systolic Cardiac Function. FASEB J 2012. [DOI: 10.1096/fasebj.26.1_supplement.1057.23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Nivia Santiago
- Physiology and PharmacologyFederal Universityof Minas GeraisBelo HorizonteBrazil
| | - Marcos B Melo
- Physiology and PharmacologyFederal Universityof Minas GeraisBelo HorizonteBrazil
| | - Mark Chappell
- Hypertension and Vascular ResearchWake Forest University School of MedicineWinston-SalemNC
| | - Jasmina Varagic
- Hypertension and Vascular ResearchWake Forest University School of MedicineWinston-SalemNC
| | - Robson AS Santos
- Physiology and PharmacologyFederal Universityof Minas GeraisBelo HorizonteBrazil
| | | |
Collapse
|
39
|
Gwathmey TM, Nixon P, Chappell M, Washburn L. 25‐Hydroxyvitamin D and Body Mass Index in Female Adolescents. FASEB J 2012. [DOI: 10.1096/fasebj.26.1_supplement.1093.15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- TanYa M Gwathmey
- Hypertension and Vascular ResearchWake Forest School of MedicineWinston-SalemNC
| | - Patricia Nixon
- Dept of Health and Exercise ScienceWake Forest UniversityWinston SalemNC
| | - Mark Chappell
- Hypertension and Vascular ResearchWake Forest School of MedicineWinston SalemNC
| | - Lisa Washburn
- Dept of Pediatrics and NeonatologyWake Forest Baptist Health27157NC
| |
Collapse
|
40
|
Locsey L, Seres I, Sztanek F, Harangi M, Padra J, Asztalos L, Paragh G, Hutchison CA, Bevins A, Langham R, Mancini E, Wirta O, Cockwell P, Hutchison CA, Keir R, Vigano M, Stella A, Evans N, Chappell M, Cockwell P, Fabbrini P, Onuigbo M, Onuigbo N, Onuigbo M, Kim S, Chang JH, Jung JY, Lee HH, Chung W, Zanoli L, Rastelli S, Marcantoni C, Tamburino C, Castellino P, Cho A, Choi H, Lee JE, Jang HR, Huh W, Kim YG, Kim DJ, Oh HY, Zanoli L, Rastelli S, Marcantoni C, Tamburino C, Castellino P, Garcia-Fernandez N, Martin-Moreno PL, Varo N, Nunez-Cordoba JM, Schlieper G, Kruger T, Kelm M, Floege J, Westenfeld R, Choi H, Cho AJ, Jang HR, Lee JE, Huh W, Kim YG, Oh HY, Kim DJ, Doganay S, Oguz AK, Ergun I, Bardachenko N, Kuryata O, Bardachenko L, Garcia-Fernandez N, Martin-Moreno PL, Varo N, Nunez-Cordoba JM, Choi H, Cho AJ, Jang HR, Lee JE, Huh W, Kim YG, Oh HY, Kim DJ, Ravani P, Malberti F, Pirelli S, Scolari F, Barrett B, Presta P, Lucisano G, Rubino A, Serraino F, Amoruso T, Renzulli A, Fuiano G, Kielstein JT, Tolk S, Heiden A, Kuhn C, Hoeper MM, Lorenzen J, Broll M, Kaever V, Burhenne H, Hafer C, Haller H, Burkhardt O, Kielstein J, Zahalkova J, Petejova N, Strojil J, Urbanek K, Bertoli S, Musetti C, Cabiati A, Assanelli E, Lauri G, Marana I, De Metrio M, Rubino M, Campodonico J, Grazi M, Moltrasio M, Marenzi G, Unarokov Z, Mukhoedova T, Fidalgo P, Coelho S, Rodrigues B, Fernandes AP, Papoila AL, Liano F, Soto K, Vanmassenhove J, Vanholder R, Glorieux G, Van Biesen W, Challiner R, Ritchie J, Hutchison A, Challiner R, Ritchie J, Hutchison A, Challiner R, Ritchie J, Hutchison A, Zaharie SI, Maria DT, Zaharie M, Vaduva C, Grauntanu C, Cana-Ruiu D, Mota E, Hayer M, Baharani J, Thomas M, Eldehni T, Selby N, McIntyre C, Fluck R, Kolhe N, Fagugli RM, Patera F, Shah PR, Kaswan KK, Kute VB, Vanikar AV, Gumber MR, Patel HV, Munjappa BC, Enginner DP, Sainaresh VV, Trivedi HL, Teixeira C, Nogueira E, Lopes JA, Almeida E, Pais de Lacerda A, Gomes da Costa A, Franca C, Mariano F, Morselli M, Bergamo D, Hollo' Z, Scella S, Maio M, Tetta C, Dellavalle A, Stella M, Triolo G, Cantaluppi V, Quercia AD, Bertinetto P, Giacalone S, Tamagnone M, Basso E, Karvela E, Gai M, Leonardi G, Anania P, Guarena C, Fenocchio CM, Pacitti A, Segoloni GP, Kim YO, Kim HG, Kim BS, Song HCS, Min JK, Kim SY, Park WD, Dalboni M, Narciso R, Quinto M, Grabulosa C, Cruz E, Monte J, Durao M, Cendoroglo M, Santos O, Batista M, Cho A, Choi H, Lee JE, Jang HR, Huh W, Kim YG, Kim DJ, Oh HY, Mancini E, Bellasi A, Giannone S, Mordenti A, Zanoni A, Santoro A, Presta P, Lucisano G, Rubino A, Serraino F, Renzulli A, Fuiano G, Lee JH, Ha SH, Kim JH, Lee GJ, Jung YC, Malindretos P, Koutroumbas G, Patrinou A, Zagkotsis G, Makri P, Togousidis I, Syrganis C, Li Cavoli G, Tortorici C, Bono L, Ferrantelli A, Giammarresi C, Zagarrigo C, Rotolo U, Kim H, Jun K, Choi W, Kim H, Jun K, Choi W, Krzesinski JM, Parotte MC, Vandevelde C, Keenan J, Dieterle F, Sultana S, Pinches M, Ciorciaro C, Schindler R, Schmitz V, Gautier JC, Benain X, Matchem J, Murray P, Adler S, Haase M, Haase-Fielitz A, Devarajan P, Bellomo R, Cruz DN, Wagener G, Krawczeski CD, Koyner JL, Murray PT, Zappitelli M, Goldstein S, Makris K, Ronco C, Martensson J, Martling CR, Venge P, Siew E, Ware LB, Ikizler A, Mertens PR, Lacquaniti A, Buemi A, Donato V, Lucisano S, Buemi M, Vanmassenhove J, Vanholder R, Glorieux G, Van Biesen W, Panagoutsos S, Kriki P, Mourvati E, Tziakas D, Chalikias G, Stakos D, Apostolakis S, Tsigalou C, Gioka T, Konstantinides S, Vargemezis V, Torregrosa I, Montoliu C, Urios A, Aguado C, Puchades MJ, Solis MA, Juan I, Sanjuan R, Blasco M, Pineda J, Carratala A, Ramos C, Miguel A, Niculae A, Checherita IA, Sandulovici R, David C, Ciocalteu A, Espinoza M, Hidalgo J, Lorca E, Santibanez A, Arancibia F, Gonzalez F, Park MY, Kim EJ, Choi SJ, Kim JK, Hwang SD, Lee KH, Seok SJ, Yang JO, Lee EY, Hong SY, Gil HW, Astapenko E, Shutov A, Savinova G, Rechnik V, Melo MJ, Lopes JA, Raimundo M, Viegas A, Camara I, Antunes F, Kim MJ, Kwon SH, Lee SW, Song JH, Lee JW. Acute kidney injury - Human studies. Clin Kidney J 2011. [DOI: 10.1093/ndtplus/4.s2.29] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
41
|
Jessup JA, Zhang L, Chen AF, Presley TD, Kim-Shapiro DB, Chappell M, Wang H, Groban L. Neuronal nitric oxide synthase inhibition improves diastolic function and reduces oxidative stress in ovariectomized mRen2.Lewis rats. Menopause 2011; 18:698-708. [PMID: 21293310 PMCID: PMC3123430 DOI: 10.1097/gme.0b013e31820390a2] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE The loss of estrogen in mRen2.Lewis rats leads to an exacerbation of diastolic dysfunction. Because specific neuronal nitric oxide synthase (nNOS) inhibition reverses renal damage in the same model, we assessed the effects of inhibiting neuronal nitric oxide on diastolic function, left ventricular remodeling, and the components of the cardiac nitric oxide system in ovariectomized (OVX) and sham-operated mRen2.Lewis rats treated with N5-(1-imino-3-butenyl)-L-ornithine (L-VNIO; 0.5 mg/kg per day for 28 d) or vehicle (saline). METHODS Female mRen2.Lewis rats underwent either bilateral oophorectomy (OVX; n = 15) or sham operation (or surgical procedure) (sham; n = 19) at 4 weeks of age. Beginning at 11 weeks of age, the rats were randomized to receive either L-VNIO or vehicle. RESULTS The surgical loss of ovarian hormones, particularly estrogen, led to exacerbated hypertension, impaired myocardial relaxation, diminished diastolic compliance, increased perivascular fibrosis, and increased relative wall thickness. The cardiac tetrahydrobiopterin-to-dihydrobiopterin levels were lower among OVX rats compared with sham-operated rats, and this altered cardiac biopterin profile was associated with enhanced myocardial superoxide production and decreased nitric oxide release. L-VNIO decreased myocardial reactive oxygen species production, increased nitrite concentrations, attenuated cardiac remodeling, and improved diastolic function. CONCLUSIONS Impaired relaxation, diastolic stiffness, and cardiac remodeling were found among OVX mRen2.Lewis rats. A possible mechanism for this unfavorable cardiac phenotype may have resulted from a deficiency in available tetrahydrobiopterin and subsequent increase in nNOS-derived superoxide and reduction in nitric oxide synthase metabolites within the heart. Selective nNOS inhibition with L-VNIO attenuated cardiac superoxide production and limited remodeling, leading to improved diastolic function in OVX mRen2.Lewis rats.
Collapse
Affiliation(s)
- Jewell A. Jessup
- Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston Salem, North Carolina
| | - Lili Zhang
- Department of Surgery, University of Pittsburgh School of Medicine, and Vascular Surgery Research, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, Pennsylvania
| | - Alex F. Chen
- Department of Surgery, University of Pittsburgh School of Medicine, and Vascular Surgery Research, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, Pennsylvania
| | - Tennille D. Presley
- Department of Physics, Wake Forest University, Winston-Salem, North Carolina
- Translational Science Center, Wake Forest University, Winston-Salem, North Carolina
| | - Daniel B. Kim-Shapiro
- Department of Physics, Wake Forest University, Winston-Salem, North Carolina
- Translational Science Center, Wake Forest University, Winston-Salem, North Carolina
| | - Mark Chappell
- Hypertension and Vascular Research Center, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
| | - Hao Wang
- Department of Anesthesiology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
| | - Leanne Groban
- Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston Salem, North Carolina
- Department of Anesthesiology, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA
| |
Collapse
|
42
|
Habota T, Chappell M. Exploring a brightness-drag illusion. Perception 2011; 40:101-3. [PMID: 21513190 DOI: 10.1068/p6767] [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: 10/18/2022]
Abstract
A sudden luminance increment on a moving stimulus was perceived significantly along the trajectory, in the direction of motion, from its displayed position. A nonlinear relationship with stimulus speed, for a Fröhlich-like illusion, but not for the luminance-increment illusion, challenges certain models of spatial mislocalisation and argues for different processes underlying the two illusions.
Collapse
Affiliation(s)
- Tina Habota
- Department of Psychology (MG) and Applied Cognitive Neuroscience Unit, Griffith Health Institute, Griffith University, Nathan, 4111 QLD, Australia
| | | |
Collapse
|
43
|
Affiliation(s)
- Sarah H. Lindsey
- Hypertension & Vascular Research CenterWake Forest University Health SciencesWinston‐SalemNC
| | - Manjunatha Bhat
- Biomedical Research Infrastructure CenterWinston‐Salem State UniversityWinston‐SalemNC
| | - Azeez Aileru
- Hypertension & Vascular Research CenterWake Forest University Health SciencesWinston‐SalemNC
- Biomedical Research Infrastructure CenterWinston‐Salem State UniversityWinston‐SalemNC
| | - Mark Chappell
- Hypertension & Vascular Research CenterWake Forest University Health SciencesWinston‐SalemNC
| |
Collapse
|
44
|
Tang L, Bi J, Chappell M, Figueroa J, Rose JC. The effect of antenatal steroid exposure on sodium uptake in ovine renal proximal tubule cells (RPTC). FASEB J 2011. [DOI: 10.1096/fasebj.25.1_supplement.1029.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - Mark Chappell
- Hypertension CenterWake Forest UniversityMedical SchoolWinston‐SalemNC
| | | | | |
Collapse
|
45
|
Abstract
Determining how the visual system locates moving stimuli continues to be an experimental and theoretical challenge. By making a moving visual stimulus equiluminant with its background, and immersing it in luminance noise, the spatial lead it normal enjoys over a flashed stimulus (the flash-lag illusion) was completely eliminated (the illusion was actually reversed for 6 out of 11 participants). As this manipulation is typically used to reduce Magnocellular (M) visual pathway processing, this is strong evidence that processing in this pathway advances the moving stimulus' perceived position. However, when the flashed stimulus was also made equiluminant in luminance noise, the illusion reappeared, indicating that M pathway processing contributed to its perception too. The presence of the illusion when both stimuli were equiluminant in luminance noise indicates that the illusion can be generated in the absence of M cell activation. To explicate the result with moving stimuli, we displayed two adjacent moving stimuli, one luminance-modulated, and the other equiluminant in noise. The latter was perceived to significantly lag the former (an 'M-P-Hess' illusion), and 39% of the difference in flash-lag illusions, with comparable moving stimulus contrasts, could be accounted for by this illusion.
Collapse
Affiliation(s)
- Mark Chappell
- Applied Cognitive Neuroscience Research Unit, Griffith Health Institute, and School of Psychology, Griffith University, Mt Gravatt, QLD, Australia.
| | | |
Collapse
|
46
|
White A, Hine T, Chappell M. The role of luminance transients in the generation of the sound-induced flash illusion. J Vis 2010. [DOI: 10.1167/10.7.884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
47
|
Embers ME, Doyle LA, Whitehouse CA, Selby EB, Chappell M, Philipp MT. Characterization of a Moraxella species that causes epistaxis in macaques. Vet Microbiol 2010; 147:367-75. [PMID: 20667430 DOI: 10.1016/j.vetmic.2010.06.029] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2010] [Revised: 06/25/2010] [Accepted: 06/29/2010] [Indexed: 10/19/2022]
Abstract
Bacteria of the genus Moraxella have been isolated from a variety of mammalian hosts. In a prior survey of bacteria that colonize the rhesus macaque nasopharynx, performed at the Tulane National Primate Research Center, organisms of the Moraxella genus were isolated from animals with epistaxis, or "bloody nose syndrome." They were biochemically identified as Moraxella catarrhalis, and cryopreserved. Another isolate was obtained from an epistatic cynomolgus macaque at the U.S. Army Medical Research Institute of Infectious Diseases. Based on differences in colony and cell morphologies between rhesus and human M. catarrhalis isolates, we hypothesized that the nonhuman primate Moraxella might instead be a different species. Despite morphological differences, the rhesus isolates, by several biochemical tests, were indistinguishable from M. catarrhalis. Analysis of the cynomolgus isolate by Vitek 2 Compact indicated that it belonged to a Moraxella group, but could not differentiate among species. However, sequencing of the 16S ribosomal RNA gene from four representative rhesus isolates and the cynomolgus isolate showed closest homology to Moraxella lincolnii, a human respiratory tract inhabitant, with 90.16% identity. To examine rhesus macaques as potential hosts for M. catarrhalis, eight animals were inoculated with human M. catarrhalis isolates. Only one of the animals was colonized and showed disease, whereas four of four macaques became epistatic after inoculation with the rhesus Moraxella isolate. The nasopharyngeal isolates in this study appear uniquely adapted to a macaque host and, though they share many of the phenotypic characteristics of M. catarrhalis, appear to form a genotypically distinct species.
Collapse
Affiliation(s)
- Monica E Embers
- Division of Bacteriology and Parasitology, Tulane National Primate Research Center, Tulane University Health Sciences Center, 18703 Three Rivers Road, Covington, LA, USA.
| | | | | | | | | | | |
Collapse
|
48
|
Tang L, Bi J, Valego N, Carey L, Figueroa J, Chappell M, Rose JC. Prenatal betamethasone exposure alters renal function in immature sheep: sex differences in effects. Am J Physiol Regul Integr Comp Physiol 2010; 299:R793-803. [PMID: 20554936 DOI: 10.1152/ajpregu.00590.2009] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Synthetic glucocorticoids are commonly given to pregnant women when premature delivery threatens. Antenatal administration of clinically relevant doses of betamethasone to pregnant sheep causes sex-specific compromises of renal function and increases in blood pressure in adult offspring. However, it is unclear whether such effects are present in immature lambs. Therefore, the aims of the present study were to determine whether antenatal betamethasone at 80-81 days of gestation increases blood pressure and adversely impacts renal function in adolescent ewes and rams. Prenatal steroid exposure increased blood pressure significantly in the young male (84 +/- 2 vs. 74 +/- 3 mmHg) and female sheep (88 +/- 5 vs. 79 +/- 4), but it did not alter basal glomerular filtration rate, renal blood flow (RBF), or sodium excretion in either sex. However, antenatal betamethasone exposure blocked increases in RBF (P = 0.001), and enhanced excretion of an acute Na load (P < 0.05) in response to systemic infusions of angiotensin (ANG)-(1-7) at 10 pmol.kg(-1).min(-1) in males. In females, the natriuretic response to combined ANG-(1-7), and Na load was significantly altered by prenatal betamethasone exposure. These findings indicate that blood pressure is increased in immature animals in response to antenatal steroid exposure and that sex-specific effects on renal function also exist. These changes may reflect greater risk for further loss of renal function with age.
Collapse
Affiliation(s)
- Lijun Tang
- Department of Obstetrics and Gynecology and Center of Research for Obstetrics and Gynecology, Wake Forest Univ. School of Medicine, Winston-Salem, NC 27157, USA.
| | | | | | | | | | | | | |
Collapse
|
49
|
Gilliam S, Pirro N, Cohen J, Chappell M, Yamaleyeva L. Type 1 Induced Diabetes Abolishes Sex Differences in Proteinuria and Angiotensinogen Excretion in mRen2.Lewis Hypertensive Rats. FASEB J 2010. [DOI: 10.1096/fasebj.24.1_supplement.812.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shea Gilliam
- Hypertension and Vascular Research CenterWake Forest University School of MedicineWinston SalemNC
| | - Nancy Pirro
- Hypertension and Vascular Research CenterWake Forest University School of MedicineWinston SalemNC
| | - Jonathan Cohen
- Hypertension and Vascular Research CenterWake Forest University School of MedicineWinston SalemNC
| | - Mark Chappell
- Hypertension and Vascular Research CenterWake Forest University School of MedicineWinston SalemNC
| | - Liliya Yamaleyeva
- Hypertension and Vascular Research CenterWake Forest University School of MedicineWinston SalemNC
| |
Collapse
|
50
|
Arter A, Nautiyal M, Shaltout H, Chappell M, Diz D. Mas And AT1 Receptor Expression In Adult Sheep Dorsomedial Medulla. FASEB J 2010. [DOI: 10.1096/fasebj.24.1_supplement.625.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alison Arter
- Hypertension and Vascular ResearchWake Forest UniversityWinston SalemNC
| | - Manisha Nautiyal
- Hypertension and Vascular ResearchWake Forest UniversityWinston SalemNC
| | - Hossam Shaltout
- Hypertension and Vascular ResearchWake Forest UniversityWinston SalemNC
| | - Mark Chappell
- Hypertension and Vascular ResearchWake Forest UniversityWinston SalemNC
| | - Debra Diz
- Hypertension and Vascular ResearchWake Forest UniversityWinston SalemNC
| |
Collapse
|