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Grubbs JB, Chapman H, Milner LA, Floyd CG, Kraus SW. Comorbid psychiatric diagnoses and gaming preferences in US armed forces veterans receiving inpatient treatment for gambling disorder. Addict Behav 2023; 147:107840. [PMID: 37643505 DOI: 10.1016/j.addbeh.2023.107840] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 07/25/2023] [Accepted: 08/23/2023] [Indexed: 08/31/2023]
Abstract
Armed Forces Veterans are uniquely vulnerable to problem gambling and gambling disorder. Even so, research regarding the full clinical profile of veterans with gambling problems lags. Gambling activities vary widely from each other, but most gambling activities can be understood as either strategic (i.e., involving some measure of skill and decision-making as a part of the gambling practice) or non-strategic (i.e., gambling activities that are entirely based on chance). Prior works have found that gamblers that prefer strategic gambling activities and those that prefer nonstrategic gambling activities often differ from each other in key ways, with the two preferences being linked to varying motivations for gambling, varying cognitions about gambling, and the course of gambling disorder. The present work sought to examine how preferences for strategic vs. nonstrategic gambling might be related to psychiatric comorbidities among U.S. Armed Forces Veterans receiving inpatient treatment for Gambling Disorder. Data from U.S. Armed Forces Veterans (N = 401) receiving residential treatment for GD between the years of 2010-2016 were analyzed. Results demonstrated that gamblers that preferred strategic gambling, as opposed to non-strategic gambling, were more likely to be younger, more likely to be men, less likely to have a nicotine use disorder, and less likely to have PTSD. Such findings suggest that gamblers with PTSD are likely to prefer nonstrategic games and may imply a unique vulnerability to gambling problems related to non-strategic gambling among armed forces veterans.
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Affiliation(s)
- Joshua B Grubbs
- Department of Psychology, Center on Alcohol, Substance use, And Addictions, University of New Mexico, United States.
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Galchenkova M, Tolstikova A, Yefanov O, Chapman H. Data reduction in protein crystallography. Acta Cryst Sect A 2022. [DOI: 10.1107/s2053273322094517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
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3
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McKee DC, Chapman H, Yi J, Magtibay PM. Robotic Excision of Transobturator Midurethral Sling. J Minim Invasive Gynecol 2021. [DOI: 10.1016/j.jmig.2021.09.470] [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: 11/25/2022]
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Moore KH, Murphy HA, Chapman H, George EM. Syncytialization alters the extracellular matrix and barrier function of placental trophoblasts. Am J Physiol Cell Physiol 2021; 321:C694-C703. [PMID: 34406903 DOI: 10.1152/ajpcell.00177.2021] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The human placenta is of vital importance for proper nutrient and waste exchange, immune regulation, and overall fetal health and growth. Specifically, the extracellular matrix (ECM) of placental syncytiotrophoblasts, which extends outward from the placental chorionic villi into maternal blood, acts on a molecular level to regulate and maintain this barrier. Importantly, placental barrier dysfunction has been linked to diseases of pregnancy such as preeclampsia and intrauterine growth restriction. To help facilitate our understanding of the interface and develop therapeutics to repair or prevent dysfunction of the placental barrier, in vitro models of the placental ECM would be of great value. In this study, we aimed to characterize the ECM of an in vitro model of the placental barrier using syncytialized BeWo choriocarcinoma cells. Syncytialization caused a marked change in syndecans, integral proteoglycans of the ECM, which matched observations of in vivo placental ECM. Syndecan-1 expression increased greatly and predominated the other variants. Barrier function of the ECM, as measured by electric cell-substrate impedance sensing (ECIS), increased significantly during and after syncytialization, whereas the ability of THP-1 monocytes to adhere to syncytialized BeWos was greatly reduced compared with nonsyncytialized controls. Furthermore, ECIS measurements indicated that ECM degradation with matrix metalloproteinase-9 (MMP-9), but not heparanase, decreased barrier function. This decrease in ECIS-measured barrier function was not associated with any changes in THP-1 adherence to syncytialized BeWos treated with heparanase or MMP-9. Thus, syncytialization of BeWos provides a physiologically accurate placental ECM with a barrier function matching that seen in vivo.
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Affiliation(s)
- Kyle H Moore
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi
| | - Haley A Murphy
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi
| | - Heather Chapman
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi
| | - Eric M George
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi.,Department of Cell and Molecular Biology, University of Mississippi Medical Center, Jackson, Mississippi
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Jaskiw GE, Chen T, Chapman H, Konicki PE, Chen P. Elevated Prevalence of Adverse Childhood Experiences in Severe Gambling Disorder: A Pilot Study in U.S. Veterans. JGI 2021. [DOI: 10.4309/jgi.2021.48.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Gambling disorder (GD) is associated with a higher prevalence of adverse childhood experiences (ACEs). Whether this applies to groups such as U.S. veterans, who already have elevated ACEs, is not known. In this pilot study, we extracted ACEs from the charts of a random sample (n = 19) male veterans in residential GD treatment and compared them to those from a general veteran sample (n =154, 30 females, 124 males). The GD group had an elevated prevalence (79% vs. 37%) of three or more ACEs and a lower prevalence (5% vs. 49%) of one or fewer ACEs. Within groups with elevated ACEs, higher ACE load may still confer a higher risk of adult GD.
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Moore K, Murphy H, Chapman H, George E. MMP9 Alters the Barrier Function of Syncytialized Placental Trophoblasts. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.03084] [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)
- Kyle Moore
- University of Mississippi Medical CenterJacksonMS
| | - Hayley Murphy
- PhysiologyUniversity of Mississippi Medical CenterJacksonMS
| | | | - Eric George
- PhysiologyUniversity of Mississippi Medical CenterJacksonMS
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Abstract
Soluble vascular endothelial growth factor receptor-1 (sFlt-1) is an anti-angiogenic protein which is secreted by numerous cell types and acts as a decoy receptor for the angiogenic protein vascular endothelial growth factor (VEGF). Despite its physiologic importance in maintaining angiogenic balance, excess sFlt-1 levels are associated with the pathogenesis of many diseases, especially those with angiogenic imbalance, endothelial dysfunction, and hypertension. Although sFlt-1 is a soluble protein, it contains a binding site for the extracellular matrix component heparan sulfate. This allows cells to retain and localize sFlt-1 in order to prevent excessive VEGF signaling. During pregnancy, placental syncytiotrophoblasts develop a large extracellular matrix which contains significant amounts of heparan sulfate. Consequently, the placenta becomes a potential storage site for large amounts of sFlt-1 bound to extracellular heparan sulfate. Additionally, it should be noted that sFlt-1 can bind to the anticoagulant unfractionated heparin due to its molecular mimicry to heparan sulfate. However, it remains unknown whether unfractionated heparin can compete with heparan sulfate for binding of localized sFlt-1. In this study, we hypothesized that administration of unfractionated heparin would displace and solubilize placental extracellular matrix(ECM)-bound sFlt-1. If unfractionated heparin can displace this large reservoir of sFlt-1 in the placenta and mobilized it into the maternal circulation, we should be able to observe its effects on maternal angiogenic balance and blood pressure. To test this hypothesis, we utilized in vitro, ex vivo, and in vivo methods. Using the BeWo placental trophoblast cell line, we observed increased sFlt-1 in the media of cells treated with unfractionated heparin compared to controls. The increase in media sFlt-1 was found in conjunction with decreased localized cellular Flt (sFlt-1 and Flt-1) as measured by total cell fluorescence. Similar results were observed using ex vivo placental villous explants treated with unfractionated heparin. Real-time quantitative PCR of the explants showed no change in sFlt-1 or heparanase-1 mRNA expression, eliminating increased production and enzymatic cleavage of heparan sulfate as causes for sFlt-1 media increase. Timed-pregnant rats given a continuous infusion of unfractionated heparin exhibited an increased mean arterial pressure as well as decreased bioavailable VEGF compared to vehicle-treated animals. These data demonstrate that chronic unfractionated heparin treatment is able to displace matrix-bound sFlt-1 into the maternal circulation to such a degree that mean arterial pressure is significantly affected. Here we have shown that the placental ECM is a storage site for large quantities of sFlt-1, and that it should be carefully considered in future studies concerning angiogenic balance in pregnancy.
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Affiliation(s)
- Kyle H Moore
- Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N State St, Jackson, MS, 39216, USA
| | - Heather Chapman
- Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N State St, Jackson, MS, 39216, USA
| | - Eric M George
- Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N State St, Jackson, MS, 39216, USA.
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Ziegler J, Chapman H, Rueth M, Hays A, Schriever C, Tsaras G. Potential Perinatally Acquired Extended Spectrum β-Lactamase Escherichia coli Urinary Tract Infection in an Infant. J Pediatr Pharmacol Ther 2020; 25:266-269. [DOI: 10.5863/1551-6776-25.3.266] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Extended-spectrum β-lactamases (ESBL) are produced mainly by members of the Enterobacteriaceae family and confer resistance to most β-lactam antibiotics. Because of limited treatment options, ESBL infections are typically more challenging to treat resulting in poor outcomes, increased complications, and mortality. Because ESBL-producing organisms are primarily seen in critically ill patients, along with those patients having prolonged hospital stays, extensive courses of antimicrobials, and/or use of invasive medical devices (i.e., urinary catheters, central venous lines, or endotracheal tubes), guidelines regarding the management of ESBL-producing organisms in the pediatric population are scant. A review of current recommended treatment options for infections caused by ESBL-producing organisms centers on the use of carbapenems, with some supportive literature regarding the utility/effectiveness of other non-β-lactam therapy. We present a case report of an 8-month-old female diagnosed with a urinary tract infection due to ESBL-producing Escherichia coli successfully treated with sulfamethoxazole/trimethoprim. Multidrug resistant infections in pediatric patients without risk factors remains an important field of study because these unique infections may pose a problem when choosing an effective empiric antimicrobial therapy.
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Mahmoudi E, Cates C, Chapman H, George EM. Hypoxia‐Induced Syndecan 1 Shedding in Placental Trophoblasts is Associated with Increased Peroxide. FASEB J 2020. [DOI: 10.1096/fasebj.2020.34.s1.09903] [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]
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Chapman H, McHenry A, Hibner M, de Souza K. 77: Tips and tricks: Presacral neurectomy. Am J Obstet Gynecol 2020. [DOI: 10.1016/j.ajog.2019.12.226] [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: 10/24/2022]
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Eddy AC, Howell JA, Chapman H, Taylor E, Mahdi F, George EM, Bidwell GL. Biopolymer-Delivered, Maternally Sequestered NF-κB (Nuclear Factor-κB) Inhibitory Peptide for Treatment of Preeclampsia. Hypertension 2019; 75:193-201. [PMID: 31786977 DOI: 10.1161/hypertensionaha.119.13368] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Preeclampsia is a hypertensive disorder of pregnancy that causes significant acute and long-term risk to the mother and the baby. The multifaceted maternal syndrome is driven by overproduction of circulating anti-angiogenic factors, widespread inflammation, and endothelial dysfunction. Nuclear factor-κB (NF-κB) is a transcription factor that plays a central role in the inflammatory response. Its activity is increased in the preeclamptic placenta, and it promotes the systemic endothelial dysfunction present in preeclampsia. There is an acute need for new therapeutics targeted to the causative pathways of preeclampsia. Our group has developed a drug delivery system based on the bioengineered protein ELP (elastin-like polypeptide) that is capable of stabilizing therapeutics in the maternal circulation and preventing their placental transfer. Here we used the ELP carrier system to deliver a peptide known to inhibit the NF-κB pathway. This polypeptide, containing a cell-penetrating peptide and an NF-κB inhibitory peptide derived from the p50 nuclear localization sequence (abbreviated SynB1-ELP-p50i), blocked NF-κB activation and prevented TNF-α (tumor necrosis factor alpha)-induced endothelin production in vitro. Fusion of the p50i peptide to the SynB1-ELP carrier slowed its plasma clearance and prevented its placental transfer in pregnant rats, resulting in increased deposition in the maternal kidney, liver, and placenta relative to the free peptide. When administered in a rat model of placental ischemia, SynB1-ELP-p50i partially ameliorated placental ischemia-induced hypertension and reduced placental TNF-α levels with no signs of toxicity. These data support the continued development of ELP-delivered NF-κB inhibitors as maternally sequestered anti-inflammatory agents for preeclampsia therapy.
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Affiliation(s)
- Adrian C Eddy
- From the Department of Physiology and Biophysics (A.C.E., H.C., E.T., E.M.G.), University of Mississippi Medical Center
| | - John Aaron Howell
- Graduate Program in Neuroscience (J.A.H.), University of Mississippi Medical Center.,Department of Neurology (J.A.H., F.M., G.L.B.), University of Mississippi Medical Center
| | - Heather Chapman
- From the Department of Physiology and Biophysics (A.C.E., H.C., E.T., E.M.G.), University of Mississippi Medical Center
| | - Erin Taylor
- From the Department of Physiology and Biophysics (A.C.E., H.C., E.T., E.M.G.), University of Mississippi Medical Center
| | - Fakhri Mahdi
- Department of Neurology (J.A.H., F.M., G.L.B.), University of Mississippi Medical Center
| | - Eric M George
- From the Department of Physiology and Biophysics (A.C.E., H.C., E.T., E.M.G.), University of Mississippi Medical Center.,Department of Cell and Molecular Biology (E.M.G., G.L.B.), University of Mississippi Medical Center
| | - Gene L Bidwell
- Department of Neurology (J.A.H., F.M., G.L.B.), University of Mississippi Medical Center.,Department of Cell and Molecular Biology (E.M.G., G.L.B.), University of Mississippi Medical Center.,Department of Pharmacology and Toxicology (G.L.B.), University of Mississippi Medical Center
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Chapman H, Moghaddam N. Published research on stress. Br Dent J 2019; 227:72. [PMID: 31350475 DOI: 10.1038/s41415-019-0577-z] [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: 11/09/2022]
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Abstract
INTRODUCTION Preeclampsia is a common pregnancy disorder which is characterized by new onset hypertension and endothelial dysfunction. Despite efforts to determine the causal factors of this disease, little progress has been made in discerning the etiology. The hypoxic and ischemic placenta, however, is generally accepted as the source for secreted factors in the maternal circulation, such as sFLT-1, which drive the maternal syndrome. METHODS Using BeWo placental trophoblast cells, we measured the role of hypoxia on sFLT-1 mRNA as well as protein production. We also exposed the cells to treatment with heparin and heparanase inhibitor OGT-2115. RESULTS We found that under hypoxic conditions mRNA levels of sFLT-1 were unchanged compared to normoxic controls. Although the message level did not differ under hypoxic conditions, the sFLT-1 release into the media was significantly greater in hypoxia. Additionally, we found that sFLT-1 is able to bind heparan strands in the extracellular matrix with its heparin binding site. These heparan strands can be cleaved by the extracellular enzyme heparanase. We found that heparanase expression was significantly increased in hypoxia, and inhibiting the actions of heparanase attenuated the release of sFLT-1 into the media. DISCUSSION While the placenta remains a source of sFLT-1, the mechanism of increased circulating sFLT-1 may differ than simple upregulation of the protein. These data demonstrate the potential importance of the role heparanase may play in releasing previously made sFLT-1 into the maternal circulation.
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Affiliation(s)
- Adrian C Eddy
- Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N State St, Jackson, MS, 39216, USA
| | - Heather Chapman
- Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N State St, Jackson, MS, 39216, USA
| | - Eric M George
- Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N State St, Jackson, MS, 39216, USA; Department of Cell and Molecular Biology, University of Mississippi Medical Center, 2500 N State St, Jackson, MS, 39216, USA.
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Grubbs JB, Chapman H. Predicting Gambling Situations: The Roles of Impulsivity, Substance Use, and Post-Traumatic Stress. Subst Abuse 2019; 13:1178221819852641. [PMID: 31258327 PMCID: PMC6591666 DOI: 10.1177/1178221819852641] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 05/02/2019] [Indexed: 12/04/2022]
Abstract
Gambling disorder and symptoms of post-traumatic stress are highly comorbid.
Numerous studies suggest that the presence of one (either disordered gambling or
post-traumatic stress) substantially increases the odds of later developing the
other. However, little is known about the etiological links between these two
domains or the nuances of the comorbidity. Past research has suggested that
symptoms of post-traumatic stress might be related to unique motivations for and
beliefs about gambling. The present work sought to examine whether or not
symptoms of post-traumatic stress might also be related to specific situational
vulnerabilities to gambling behaviors. Using a large cross-sectional sample of
Internet-using adults in the United States who were primarily recreational
gamblers (N = 743; 46% men, Mage = 36.0, SD = 11.1),
as well as an inpatient sample of US Armed Forces veterans seeking treatment for
gambling disorder (N = 332, 80% men, Mage = 53.5,
SD = 11.5), the present work tested whether or not symptoms of post-traumatic
stress were uniquely related to a variety of gambling situations. Results in
both samples revealed that even when controlling for potentially confounding
variables (eg, substance use and trait impulsivity), symptoms of post-traumatic
stress were uniquely related to gambling in response to negative affect,
gambling in response to social pressure, and gambling due to a need for
excitement. These findings are consistent with recent work suggesting that
individuals with post-traumatic stress symptoms are more likely to engage in
gambling behaviors for unique reasons that differ from gamblers without such
symptoms.
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Affiliation(s)
- Joshua B Grubbs
- Department of Psychology, Bowling Green State University, Bowling Green, OH, USA
| | - Heather Chapman
- Gambling Treatment Program, Louis Stokes Cleveland VA Medical Center, Cleveland, OH, USA
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Eddy AC, Moore KH, Chapman H, George EM. sFlt‐1 Splicing Regulation by U2AF65 and JMJD6 in Endothelial Cells. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.865.12] [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)
| | - Kyle H Moore
- University of Mississippi Medical CenterJacksonMS
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Moore KH, Eddy AC, Chapman H, George EM. sFlt‐1 Production in Endothelial Cells is Regulated in Part by VEGF Receptor Signaling. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.865.11] [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)
- Kyle H Moore
- Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMS
| | - Adrian C Eddy
- Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMS
| | - Heather Chapman
- Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMS
| | - Eric M George
- Physiology and BiophysicsUniversity of Mississippi Medical CenterJacksonMS
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Grubbs JB, Chapman H, Shepherd KA. Post-traumatic stress and gambling related cognitions: Analyses in inpatient and online samples. Addict Behav 2019; 89:128-135. [PMID: 30292070 DOI: 10.1016/j.addbeh.2018.09.035] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 09/06/2018] [Accepted: 09/27/2018] [Indexed: 10/28/2022]
Abstract
Individuals with gambling disorder (GD) report much higher rates of post-traumatic stress symptoms and post-traumatic stress disorder (PTSS/D) than the general population, and individuals with both PTSS/D and GD often report much greater distress and impairment in daily life in comparison to individuals with GD alone (Grubbs, Chapman, Milner, Gutierrez, & Bradley, 2018). Despite these associations, little is known about the specific ways in which PTSS/D and GD might influence each other. To address this gap in research, the present work sought to examine how PTSD might be related to the expression and experience of gambling related cognitions. Specifically, it was hypothesized that individuals with PTSD or symptoms of PTSD (i.e., subclinical levels of post-traumatic stress) would demonstrate greater cognitive distortions and erroneous beliefs about gambling. To test these hypotheses, we analyzed data from two samples, an inpatient sample of U.S. Armed Forces veterans seeking treatment for gambling disorder (n = 332) and an online sample of largely recreational gambling U.S. adults (n = 589). Results consistently revealed that, in both samples, individuals with PTSD or symptoms of PTSD were likely to report greater gambling related cognitions. These findings persisted, even when gambling symptom severity and trait neuroticism were held constant. Collectively, these results suggest that PTSD is uniquely associated with greater cognitive distortions and erroneous beliefs about gambling behaviors. These findings bear distinct implications for current understandings of how PTSS/D and GD are related, as well as for treatment of individuals with dealing with this comorbidity.
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Eddy AC, Chapman H, George EM, Bidwell Iii GL. 282. A novel NF-kB inhibitory peptide-based therapeutic for the management of preeclampsia. Pregnancy Hypertens 2018. [DOI: 10.1016/j.preghy.2018.08.112] [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: 10/28/2022]
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George E, Chapman H, Eddy A. 327. Shedding of the placental glycocalyx in response to ischemia and hypoxia. Pregnancy Hypertens 2018. [DOI: 10.1016/j.preghy.2018.08.127] [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: 10/28/2022]
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Grubbs JB, Chapman H, Milner L, Gutierrez IA, Bradley DF. Examining links between posttraumatic stress and gambling motives: The role of positive gambling expectancies. Psychol Addict Behav 2018; 32:821-831. [PMID: 30265056 DOI: 10.1037/adb0000399] [Citation(s) in RCA: 13] [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: 11/08/2022]
Abstract
Problem gambling and gambling disorder (GD) are associated with a range of mental health concerns that extend beyond gambling behaviors alone. Prior works have consistently linked gambling disorder with symptoms of posttraumatic stress disorder (PTSD), both cross-sectionally and over time. However, very little work has examined the specific relationships between these 2 disorders. The present work postulated that symptoms of PTSD are likely associated with unique beliefs about gambling behaviors and unique motivations to gamble. Using 2 samples-an inpatient sample of U.S. Armed Forces veterans (N = 332) seeking treatment for GD and a Web-sample of gambling adults (N = 589)-we examined these ideas. Results from both samples indicated that symptoms of PTSD were related to positive gambling expectancies and coping motivations for gambling. Additionally, in both samples, positive gambling expectancies were associated with greater coping motivations for gambling. Structural equation models revealed that positive gambling expectancies were consistently associated with coping motivations for gambling. The findings indicate that symptoms of PTSD are likely associated with unique beliefs about and motivations for gambling behaviors. Given the high comorbidity between symptoms of PTSD and GD, these specific relationships are likely of clinical interest in populations seeking treatment for either PTSD or for problems with gambling behaviors. (PsycINFO Database Record (c) 2018 APA, all rights reserved).
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Eddy AC, Chapman H, George EM. Acute Hypoxia and Chronic Ischemia Induce Differential Total Changes in Placental Epigenetic Modifications. Reprod Sci 2018; 26:766-773. [PMID: 30223723 DOI: 10.1177/1933719118799193] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Preeclampsia is a common obstetrical complication, hallmarked by new-onset hypertension. Believed to result from placental insufficiency and chronic placental ischemia, the symptoms of preeclampsia are caused by release of pathogenic factors from the placenta itself, although the mechanisms of their regulation are in many cases unknown. One potential mechanism is through changes in placental epigenetic chromatin modifications, particularly histone acetylation and DNA methylation. Here, we determined the effects of chronic ischemia on global epigenetic modifications in the rodent placenta in vivo and acute hypoxia in BeWo placental trophoblast cells in vitro. Placental insufficiency via uterine artery restriction increased maternal blood pressure and fetal demise while decreasing placental and fetal mass. Global placental histone H3 acetylation levels were significantly decreased at H3 K9, K14, K18, K27, and K56. Interestingly, when BeWo-immortalized placental trophoblast cells were cultured in oxygen concentrations mimicking healthy and ischemic placentas, there was a significant increase in acetylated at K9, K18, K27, and K56. This was associated with a small but significant decrease in placental acetyl-CoA, suggesting depletion in the source of acetyl group donors. Finally, while global methylation of cytosine from placental DNA was low in both groups of animals (<1%), there was ∼50% increase in 5-mC in response to chronic ischemia. This suggests acute hypoxia and chronic ischemia induce differential global changes in histone acetylation in the placenta and that chronically altered metabolic profiles could affect histone acetylation in the placenta, thereby regulating production of pathogenic factors from the placenta during preeclampsia.
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Affiliation(s)
- Adrian C Eddy
- Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N State St, Jackson, MS, 39216, USA
| | - Heather Chapman
- Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N State St, Jackson, MS, 39216, USA
| | - Eric M George
- Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N State St, Jackson, MS, 39216, USA. .,Department of Cell and Molecular Biology, University of Mississippi Medical Center, Jackson, MS, USA.
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Chapman H, Riesenberg A, Ehrman LA, Kohli V, Nardini D, Nakafuku M, Campbell K, Waclaw RR. Gsx transcription factors control neuronal versus glial specification in ventricular zone progenitors of the mouse lateral ganglionic eminence. Dev Biol 2018; 442:115-126. [PMID: 29990475 DOI: 10.1016/j.ydbio.2018.07.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 07/06/2018] [Accepted: 07/06/2018] [Indexed: 12/14/2022]
Abstract
The homeobox gene Gsx2 has previously been shown to inhibit oligodendroglial specification in dorsal lateral ganglionic eminence (dLGE) progenitors of the ventral telencephalon. The precocious specification of oligodendrocyte progenitor cells (OPCs) observed in Gsx2 mutants, however, is transient and begins to normalize by late stages of embryogenesis. Interestingly, this normalization correlates with the expansion of Gsx1, a close homolog of Gsx2, in a subset of progenitors in the Gsx2 mutant LGE. Here, we interrogated the mechanisms underlying oligodendroglial specification in Gsx2 mutants in relation to Gsx1. We found that Gsx1/2 double mutant embryos exhibit a more robust expansion of Olig2+ cells (i.e. OPCs) in the subventricular zone (SVZ) of the dLGE than Gsx2 mutants. Moreover, misexpression of Gsx1 throughout telencephalic VZ progenitors from E15 and onward resulted in a significant reduction of cortical OPCs. These results demonstrate redundant roles of Gsx1 and Gsx2 in suppressing early OPC specification in LGE VZ progenitors. However, Gsx1/2 mutants did not show a significant increase in adjacent cortical OPCs at later stages compared to Gsx2 mutants. This is likely due to reduced proliferation of OPCs within the SVZ of the Gsx1/2 double mutant LGE, suggesting a novel role for Gsx1 in expansion of migrating OPCs in the ventral telencephalon. We further investigated the glial specification mechanisms downstream of Gsx2 by generating Olig2/Gsx2 double mutants. Consistent with the known essential role for Olig2 in OPC specification, ectopic production of cortical OPCs observed in Gsx2 mutants disappeared in Olig2/Gsx2 double mutants. These mutants, however, maintained the expanded expression of gliogenic markers Zbtb20 and Bcan in the VZ of the LGE similarly to Gsx2 single mutants, suggesting that Gsx2 suppresses gliogenesis via Olig2-dependent and -independent mechanisms.
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Affiliation(s)
- Heather Chapman
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229, USA
| | - Amy Riesenberg
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229, USA
| | - Lisa A Ehrman
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229, USA
| | - Vikram Kohli
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229, USA
| | - Diana Nardini
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229, USA
| | - Masato Nakafuku
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229, USA
| | - Kenneth Campbell
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229, USA.
| | - Ronald R Waclaw
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229, USA; Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229, USA.
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Chapman H, Eddy AC, Williams L, Moore K, George EM. Differential Regulation of sFlt‐1 in response to VEGF Family‐Based Therapeutics In Endothelial Cells. FASEB J 2018. [DOI: 10.1096/fasebj.2018.32.1_supplement.lb341] [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]
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24
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Eddy AC, Chapman H, Mahdi F, George EM, Bidwell GL. A Novel Anti‐Inflammatory Agent for the Management of Preeclampsia. FASEB J 2018. [DOI: 10.1096/fasebj.2018.32.1_supplement.911.3] [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)
| | | | - Fakhri Mahdi
- University of Mississippi Medical CenterJacksonMS
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Logue OC, Mahdi F, Chapman H, George EM, Bidwell GL. A Maternally Sequestered, Biopolymer-Stabilized Vascular Endothelial Growth Factor (VEGF) Chimera for Treatment of Preeclampsia. J Am Heart Assoc 2017; 6:e007216. [PMID: 29629873 PMCID: PMC5779036 DOI: 10.1161/jaha.117.007216] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Accepted: 10/30/2017] [Indexed: 11/16/2022]
Abstract
BACKGROUND Preeclampsia is a hypertensive syndrome that complicates 3% to 5% of pregnancies in the United States. Preeclampsia originates from an improperly vascularized and ischemic placenta that releases factors that drive systemic pathophysiology. One of these factors, soluble fms-like tyrosine kinase-1, is believed to sequester vascular endothelial growth factor (VEGF), leading to systemic endothelial dysfunction and hypertension. With the goal of targeting soluble fms-like tyrosine kinase-1 while simultaneously preventing fetal exposure to VEGF, we fused VEGF to elastin-like polypeptide, a biopolymer carrier that does not cross the placental barrier (ELP-VEGF). METHODS AND RESULTS ELP-VEGF restored in vitro endothelial cell tube formation in the presence of plasma from placental ischemic rats. Long-term administered ELP-VEGF in pregnant rats accumulated in maternal kidneys, aorta, liver, and placenta, but the protein was undetectable in the pups when administered at therapeutic doses in dams. Long-term administration of ELP-VEGF in a placental ischemia rat model achieved dose-dependent attenuation of hypertension, with blood pressure equal to sham controls at a dose of 5 mg/kg per day. ELP-VEGF infusion increased total plasma soluble fms-like tyrosine kinase-1 levels but dramatically reduced free plasma soluble fms-like tyrosine kinase-1 and induced urinary excretion of nitrate/nitrite, indicating enhanced renal nitric oxide signaling. ELP-VEGF at up to 5 mg/kg per day had no deleterious effect on maternal or fetal body weight. However, dose-dependent adverse events were observed, including ascites production and neovascular tissue encapsulation around the minipump. CONCLUSIONS ELP-VEGF has the potential to treat the preeclampsia maternal syndrome, but careful dosing and optimization of the delivery route are necessary.
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Affiliation(s)
- Omar C Logue
- Department of Neurology, University of Mississippi Medical Center, Jackson, MS
| | - Fakhri Mahdi
- Department of Neurology, University of Mississippi Medical Center, Jackson, MS
| | - Heather Chapman
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS
| | - Eric M George
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS
- Department of Biochemistry, University of Mississippi Medical Center, Jackson, MS
| | - Gene L Bidwell
- Department of Neurology, University of Mississippi Medical Center, Jackson, MS
- Department of Biochemistry, University of Mississippi Medical Center, Jackson, MS
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Fischetti RF, Martin-Garcia J, Zatsepin N, Stander N, Zhu L, Subramanian G, Nelson G, Coe J, Nagaratnam N, Roy-Chowdury S, Kissick D, Ishchenko A, Conrad C, Ketawala G, James D, Zook J, Ogata C, Venugopalan N, Xu S, Meents A, Srajer V, Henning R, Chapman H, Spence J, Weierstall U, Cherezov V, Fromme P, Liu W. Monochromatic and polychromatic serial crystallography at the Advanced Photon Source. Acta Crystallogr A Found Adv 2017. [DOI: 10.1107/s0108767317096404] [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: 11/11/2022] Open
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Eddy AC, Williams LJ, Chapman H, George EM. Abstract P641: Markers of Autophagy are Induced in Response to Placental Ischemia. Hypertension 2016. [DOI: 10.1161/hyp.68.suppl_1.p641] [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
Preeclampsia is a disorder characterized by new onset hypertension during pregnancy, as well as other clinical findings such as proteinuria and edema. This disorder affects approximately five percent of pregnancies and is the leading cause of maternal and fetal morbidity. Though the origins of the disease are unclear, it is thought that placental ischemia is central to its etiology. Commonly, the uterine spiral artery fails to adequately remodel to allow for adequate blood flow to the developing fetal/placental unit, causing hypoxia and ischemia. It is well established that hypoxia can lead to endoplasmic reticulum (ER) stress in cells. When ER stress occurs, protein misfolding occurs, leading to the unfolded protein response (UPR). One process which could be important in an attempt to restore cellular homeostasis is autophagy, a specialized process of carrying defective proteins to lysosomes for degradation to prevent aggregation from occurring. There are several factors which play a role in this process, and are utilized as a marker for autophagy, notably Beclin-1 and various autophagy related genes (Atg). Though autophagy has been examined previously in cancer and numerous cardiovascular abnormalities, it is unclear whether induction of autophagy is one of the cell survival pathways activated in response to placental ischemia. Here we have examined placental tissue from term pregnant rats and rats which have undergone placental ischemia due to the reduced uterine perfusion pressure (RUPP) procedure to to determine whether autophagy pathways have been activated as part of the cell survival response during chronic ischemia. As determined by western blot, protein levels of the autophagy markers beclin (57 ± 6 A.U. vs 113 ± 16 A.U., p<0.05), Atg3 (34 ±3 A.U. vs 54 ±8 A.U., p<0.05), Atg12 (550 ± 77 A.U. vs. 1022 ± 160 A.U., p<0.05), and Atg16 (43 ± 6 A.U. vs 147 ±47 A.U., p<0.05) were all significantly increased in placental tissue in RUPP treated animals. These data, coupled with our previous studies, suggest that several cell survival pathways are activated in response to chronic placental ischemia, notably programmed cell autophagy. The importance of these pathways in survival of placental tissue and overall placental function will be the object of future study.
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Stewart WH, George E, Bidwell GL, Chapman H, Mahdi F, Wilson L. Abstract 034: Characterization of A Novel Maternally Restricted Pro-angiogenic Therapeutic for Preeclampsia. Hypertension 2016. [DOI: 10.1161/hyp.68.suppl_1.034] [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
Background:
Preeclampsia is a major obstetrical health concern, affecting 5-8% of all pregnancies. Hallmarked by hypertension and endothelial dysfunction the origin of the disease remains obscure, though it is generally accepted that placental insufficiency/ischemia is a central cause. In response, the placenta secretes pathogenic factors, in particular the anti-angiogenic protein sFlt-1. Currently, there is no effective therapy for the management of the preeclampsia patient. We have recently produced a novel synthetic peptide based on placental growth factor (PlGF) which is maternally restricted by fusion to the synthetic carrier elastin like polypeptide (ELP). Here, we describe its in vivo pharmacokinetics and biodistribution.
Methods:
Fluorescently labeled ELP-PLGF was administered i.v. and blood sampled serially to determine clearance kinetics. Long-term pharmacokinetics and biodistribution was performed after subcutaneous administration of labeled peptide. Measurements were made on serially drawn blood, and in the whole animal by in vivo imaging.
Results:
ELP-PlGF exhibited markedly more favorable pharmacokinetics than the normal half life of PlGF, with a terminal half-life of ~10 hours as opposed to ~30 minutes for PlGF alone. Chronic administration found highest levels accumulating in placenta and kidney (two favorable targets for preeclampsia) and liver. A single subcutaneous administration at 100mg/kg resulted in sustained therapeutic plasma concentrations for over 10 days.
Conclusion:
These data demonstrate that ELP-PlGF has favorable pharmacokinetic and biodistribution profiles. Previous data suggest ELP-PlGF directly antagonizes sFlt-1 in culture. Future studies to assess the in vivo effectiveness of ELP-PlGF in managing placental ischemia induced hypertension and endothelial dysfunction are currently in progress.
Acknowledgment:
This work was supported by NIH grants R0121527 (GLB), T32HL105324 (OCL), P01HL51971, P20GM104357 (EMG), and R00HL116774 (EMG)
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Chapman H, George EM. Abstract P319: Chronic Ischemia Induces Global Changes in Placental Epigenetic Modifications. Hypertension 2016. [DOI: 10.1161/hyp.68.suppl_1.p319] [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
Preeclampsia is a common and serious obstetrical complication, hallmarked by new-onset hypertension and maternal endothelial dysfunction. Believed to result as a consequence of placental insufficiency and chronic placental ischemia, the symptoms of preeclampsia are caused by release of pathogenic factors from the placenta itself. A number of these factors have been identified, and it is likely that there are molecular mechanisms which remain obscure. The molecular regulation of even the known factors is often unclear. Here, we have used an established rodent model of placental ischemia which mimics many of the aspects of the human disorder to determine the direct effects of ischemia on global epigenetic modification in the placenta proper. In response to placental insufficiency, maternal blood pressure and rate of fetal demise increased significantly, while placental and fetal mass were decreased. Whole placental levels of histone H3 acetylation at K9 and K27 were increased ~2 and 3 fold respectively. Global methylation of cytosine from placental DNA was low in both groups (<1%), but there was ~50% increase in 5-mC in response to chronic ischemia. These results suggest that chronic placental ischemia induces global changes in epigenetic modification of chromatin in the placenta. This could be an important factor in the regulation of known and unknown pathogenic factors produced by the placenta in the preeclampsia patient.
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Viisanen H, Chapman H, Wei H, Lasierra Losada M, Koivisto A, Akerman KE, Pertovaara A. Pronociceptive effects induced by cutaneous application of a transient receptor potential ankyrin 1 (TRPA1) channel agonist methylglyoxal in diabetic animals: comparison with tunicamycin-induced endoplastic reticulum stress. J Physiol Pharmacol 2016; 67:587-594. [PMID: 27779479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Accepted: 08/16/2016] [Indexed: 06/06/2023]
Abstract
Methylglyoxal (MG) is a reactive carbonyl compound generated in diabetes mellitus. MG is an established transient receptor potential ankyrin 1 (TRPA1) channel agonist that contributes to TRPA1-mediated diabetic pain hypersensitivity. Here we studied whether exposure to diabetes and thereby to elevated endogenous MG modulates hypersensitivity induced by intradermal MG. Moreover, since diabetes induces endoplasmic reticulum (ER) stress, we compared the role of TRPA1 in diabetes and ER stress by assessing whether tunicamycin-induced ER stress, without diabetes, produces TRPA1-mediated pain hypersensitivity and by assessing whether ER stress and diabetes have similar modulatory effects on MG-induced hypersensitivity. In vitro patch clamp recording was performed to assess whether tunicamycin is a TRPA1 agonist. Behavioral tests showed that mechanical hypersensitivity induced by MG is reduced in diabetes and ER stress. In healthy controls, hypersensitivity induced by MG was reduced when MG was administered for the second time in the same but not adjacent plantar sites. Hypersensitivity induced by ER stress was reversed by pharmacological blocking of TRPA1. In vitro patch clamp recording indicated that tunicamycin itself (30 μM) is not a TRPA1 agonist. The results indicate that pain hypersensitivity induced by non-diabetic ER stress as well as that induced by diabetes is mediated TRPA1. Reduction of MG-induced hypersensitivity in diabetes or ER stress may, at least partly, be explained by peripheral mechanisms.
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Affiliation(s)
- H Viisanen
- Department of Physiology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - H Chapman
- Orion Corporation, OrionPharma, Turku, Finland
| | - H Wei
- Department of Physiology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - M Lasierra Losada
- Department of Physiology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - A Koivisto
- Orion Corporation, OrionPharma, Turku, Finland
| | - K E Akerman
- Department of Physiology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - A Pertovaara
- Department of Physiology, Faculty of Medicine, University of Helsinki, Helsinki, Finland.
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Seto Y, Nakatani T, Masuyama N, Taya S, Kumai M, Minaki Y, Hamaguchi A, Inoue YU, Inoue T, Miyashita S, Fujiyama T, Yamada M, Chapman H, Campbell K, Magnuson MA, Wright CV, Kawaguchi Y, Ikenaka K, Takebayashi H, Ishiwata S, Ono Y, Hoshino M. Temporal identity transition from Purkinje cell progenitors to GABAergic interneuron progenitors in the cerebellum. Nat Commun 2015; 5:3337. [PMID: 24535035 DOI: 10.1038/ncomms4337] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2013] [Accepted: 01/29/2014] [Indexed: 11/09/2022] Open
Abstract
In the cerebellum, all GABAergic neurons are generated from the Ptf1a-expressing ventricular zone (Ptf1a domain). However, the machinery to produce different types of GABAergic neurons remains elusive. Here we show temporal regulation of distinct GABAergic neuron progenitors in the cerebellum. Within the Ptf1a domain at early stages, we find two subpopulations; dorsally and ventrally located progenitors that express Olig2 and Gsx1, respectively. Lineage tracing reveals the former are exclusively Purkinje cell progenitors (PCPs) and the latter Pax2-positive interneuron progenitors (PIPs). As development proceeds, PCPs gradually become PIPs starting from ventral to dorsal. In gain- and loss-of-function mutants for Gsx1 and Olig1/2, we observe abnormal transitioning from PCPs to PIPs at inappropriate developmental stages. Our findings suggest that the temporal identity transition of cerebellar GABAergic neuron progenitors from PCPs to PIPs is negatively regulated by Olig2 and positively by Gsx1, and contributes to understanding temporal control of neuronal progenitor identities.
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Affiliation(s)
- Yusuke Seto
- 1] Department of Biochemistry and Cellular Biology, National Institute of Neuroscience, NCNP, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan [2] Department of Physics, Major in Integrative Bioscience and Biomedical Engineering, Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Tomoya Nakatani
- KAN Research Institute Inc., 3F, Kobe MI R&D Center, 6-7-3 Minatojima-minamimachi, Chuo-ku, Kobe 650-0047, Japan
| | - Norihisa Masuyama
- Department of Biochemistry and Cellular Biology, National Institute of Neuroscience, NCNP, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
| | - Shinichiro Taya
- Department of Biochemistry and Cellular Biology, National Institute of Neuroscience, NCNP, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
| | - Minoru Kumai
- KAN Research Institute Inc., 3F, Kobe MI R&D Center, 6-7-3 Minatojima-minamimachi, Chuo-ku, Kobe 650-0047, Japan
| | - Yasuko Minaki
- 1] KAN Research Institute Inc., 3F, Kobe MI R&D Center, 6-7-3 Minatojima-minamimachi, Chuo-ku, Kobe 650-0047, Japan [2]
| | - Akiko Hamaguchi
- KAN Research Institute Inc., 3F, Kobe MI R&D Center, 6-7-3 Minatojima-minamimachi, Chuo-ku, Kobe 650-0047, Japan
| | - Yukiko U Inoue
- Department of Biochemistry and Cellular Biology, National Institute of Neuroscience, NCNP, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
| | - Takayoshi Inoue
- Department of Biochemistry and Cellular Biology, National Institute of Neuroscience, NCNP, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
| | - Satoshi Miyashita
- 1] Department of Biochemistry and Cellular Biology, National Institute of Neuroscience, NCNP, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan [2] Department of Electrical Engineering and Bioscience, Graduate School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Tomoyuki Fujiyama
- Department of Biochemistry and Cellular Biology, National Institute of Neuroscience, NCNP, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
| | - Mayumi Yamada
- Department of Biochemistry and Cellular Biology, National Institute of Neuroscience, NCNP, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
| | - Heather Chapman
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, Ohio 45229-3026, USA
| | - Kenneth Campbell
- Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, Ohio 45229-3026, USA
| | - Mark A Magnuson
- Department of Molecular Physiology and Biophysics and Center for Stem Cell Biology, Vanderbilt University School of Medicine, 2213 Garland Avenue, 9465 MRB IV, Nashville, Tennessee 37232-0494, USA
| | - Christopher V Wright
- Vanderbilt University Program in Developmental Biology, Department of Cell and Developmental Biology, Vanderbilt University Medical Center, 2213 Garland Avenue, 9465 MRB IV, Nashville, Tennessee 37232-0494, USA
| | - Yoshiya Kawaguchi
- Department of Clinical Application, Center for iPS Cell Research and Application, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan
| | - Kazuhiro Ikenaka
- 1] Division of Neurobiology and Bioinformatics, National Institute for Physiological Sciences, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan [2] Department of Physiological Sciences, School of Life Sciences, Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 240-0193, Japan
| | - Hirohide Takebayashi
- 1] Division of Neurobiology and Bioinformatics, National Institute for Physiological Sciences, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan [2] Department of Physiological Sciences, School of Life Sciences, Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 240-0193, Japan [3] Division of Neurobiology and Anatomy, Graduate School of Medical and Dental Sciences, Niigata University, 1-757 Asahimachi, Chuo-ku, Niigata 951-8510, Japan
| | - Shin'ichi Ishiwata
- 1] Department of Physics, Major in Integrative Bioscience and Biomedical Engineering, Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan [2] Waseda Bioscience Research Institute in Singapore, Waseda University, 11 Biopolis Way, #05-01/02, Helios, Singapore 138667, Republic of Singapore
| | - Yuichi Ono
- KAN Research Institute Inc., 3F, Kobe MI R&D Center, 6-7-3 Minatojima-minamimachi, Chuo-ku, Kobe 650-0047, Japan
| | - Mikio Hoshino
- Department of Biochemistry and Cellular Biology, National Institute of Neuroscience, NCNP, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo 187-8502, Japan
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Chapman H, Bloomfield D, Cameron D, Bliss J, Barrett-Lee P, Canney P, Morden J, Velikova G, Hall P. 1231 Cost-effectiveness analysis of the use of pegfilgrastim to enable accelerated adjuvant chemotherapy in the TACT2 trial (CRUK/05/019). Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)30535-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Saarnilehto M, Chapman H, Savinko T, Lindstedt K, Lauerma AI, Koivisto A. Contact sensitizer 2,4-dinitrochlorobenzene is a highly potent human TRPA1 agonist. Allergy 2014; 69:1424-7. [PMID: 25041656 DOI: 10.1111/all.12488] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/17/2014] [Indexed: 11/27/2022]
Abstract
2,4-Dinitrochlorobenzene (DNCB) is widely used in human clinical studies and in experimental animal studies to evoke allergic contact dermatitis. 2,4-Dinitrochlorobenzene is a potent immunogen capable of inducing contact sensitization in all humans exposed. However, the mechanism by which DNCB evokes such symptoms is presently unknown. TRPA1 is a nonselective cation channel that is expressed in peptidergic sensory neurons and fibroblasts. TRPA1 activation was recently implicated in the pathophysiology of atopic dermatitis especially in transducing cutaneous itch signals. Here, we test the hypothesis that DNCB acts as a TRPA1 agonist and thereby evokes allergic symptoms. We found that DNCB activates human TRPA1 dose dependently in FLIPR experiments with an EC50 of 167 nM, an effect that was fully blocked by selective TRPA1 antagonists Chembridge-5861528 and A-967079. Similarly, DNCB activated nonselective TRPA1 current in patch clamp studies. Neutralization of 3 critical cysteines in TRPA1 resulted in a loss of DNCB agonism.
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Affiliation(s)
| | - H. Chapman
- In Vitro Biology; R&D; Orion Pharma; Turku Finland
| | - T. Savinko
- Institute of Biotechnology; University of Helsinki; Helsinki Finland
| | | | - A. I. Lauerma
- Department of Dermatology; University of Helsinki and Helsinki University Central Hospital; Helsinki Finland
| | - A. Koivisto
- In Vitro Biology; R&D; Orion Pharma; Turku Finland
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Nelson KG, Young K, Chapman H. Examining the performance of the brief addiction monitor. J Subst Abuse Treat 2014; 46:472-81. [DOI: 10.1016/j.jsat.2013.07.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Revised: 07/01/2013] [Accepted: 07/02/2013] [Indexed: 10/25/2022]
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Redecke L, Betzel C, Rehders D, Nass K, DePonte DP, White T, Duszenko M, Spence J, Fromme P, Schlichting I, Chapman H. Free electron laser radiation and in vivogrown nano-crystals open new routes in structural biology and options for time-resolved experiments. Acta Crystallogr A 2013. [DOI: 10.1107/s0108767313099789] [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: 11/11/2022] Open
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Chapman H, Waclaw RR, Pei Z, Nakafuku M, Campbell K. The homeobox gene Gsx2 controls the timing of oligodendroglial fate specification in mouse lateral ganglionic eminence progenitors. Development 2013; 140:2289-98. [PMID: 23637331 DOI: 10.1242/dev.091090] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The homeobox gene Gsx2 has previously been shown to be required for the specification of distinct neuronal subtypes derived from lateral ganglionic eminence (LGE) progenitors at specific embryonic time points. However, its role in the subsequent generation of oligodendrocytes from these progenitors remains unclear. We have utilized conditional gain-of-function and loss-of-function approaches in order to elucidate the role of Gsx2 in the switch between neurogenesis and oligodendrogenesis within the embryonic ventral telencephalon. In the absence of Gsx2 expression, an increase in oligodendrocyte precursor cells (OPCs) with a concomitant decrease in neurogenesis is observed in the subventricular zone of the LGE at mid-stages of embryogenesis (i.e. E12.5-15.5), which subsequently leads to an increased number of Gsx2-derived OPCs within the adjacent mantle regions of the cortex before birth at E18.5. Moreover, using Olig2(cre) to conditionally inactivate Gsx2 throughout the ventral telencephalon with the exception of the dorsal (d)LGE, we found that the increase in cortical OPCs in Gsx2 germline mutants are derived from dLGE progenitors. We also show that Ascl1 is required for the expansion of these dLGE-derived OPCs in the cortex of Gsx2 mutants. Complementing these results, gain-of-function experiments in which Gsx2 was expressed throughout most of the late-stage embryonic telencephalon (i.e. E15.5-18.5) result in a significant decrease in the number of cortical OPCs. These results support the notion that high levels of Gsx2 suppress OPC specification in dLGE progenitors and that its downregulation is required for the transition from neurogenesis to oligodendrogenesis.
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Affiliation(s)
- Heather Chapman
- Divisions of Developmental Biology and Neurosurgery, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229, USA
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Arnlund D, Johansson L, Katona G, Malmerberg E, Davidsson J, Barty A, Schlichting I, Boutet S, Fromme P, Spence J, Chapman H, Neutze R. Visualising rapid structural changes in photosynthetic reaction centres with XFEL radiation. Acta Crystallogr A 2012. [DOI: 10.1107/s010876731209976x] [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: 11/10/2022] Open
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Fromme P, Chapman H, Kupitz C, Hunter MS, Kirian RA, Barty A, White TA, Aquilla A, Stellato F, Beyerlein K, DePonte DP, Frank M, Schlichting I, Shoeman R, Lomb L, Steinbrenner J, Nass K, Boutet S, Bogan MJ, Williams G, Zatsepin N, Basu S, Wang D, James D, Fromme R, Grotjohann I, Bottin H, Cherezov V, Stevens R, Cobbe D, Cramer W, Stroud R, Doak RB, Weierstall U, Schmidt K, Spence JCH. Femtosecond nanocrystallography of membrane proteins opens a new era for structural biology. Acta Crystallogr A 2012. [DOI: 10.1107/s0108767312099461] [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: 11/11/2022] Open
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Betzel C, Meyer A, Dierks K, Einspahr H, Hilgenfeld R, Redecke L, Duszensko M, Chapman H. Latest methods to grow and prepare micro- and nano-crystals for future free-electron laser and synchrotron radiation sources. Acta Crystallogr A 2012. [DOI: 10.1107/s0108767312099795] [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: 11/10/2022] Open
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40
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Huston R, Chan YC, Chapman H, Gardner T, Shaw G. Source apportionment of heavy metals and ionic contaminants in rainwater tanks in a subtropical urban area in Australia. Water Res 2012; 46:1121-1132. [PMID: 22196953 DOI: 10.1016/j.watres.2011.12.008] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 11/09/2011] [Accepted: 12/05/2011] [Indexed: 05/31/2023]
Abstract
Due to prolonged droughts in recent years, the use of rainwater tanks in urban areas has increased in Australia. In order to apportion sources of contribution to heavy metal and ionic contaminants in rainwater tanks in Brisbane, a subtropical urban area in Australia, monthly tank water samples (24 sites, 31 tanks) and concurrent bulk deposition samples (18 sites) were collected during mainly April 2007-March 2008. The samples were analysed for acid-soluble metals, soluble anions, total inorganic carbon and total organic carbon, and characteristics such as total solid and pH. The Positive Matrix Factorisation model, EPA PMF 3.0, was used to apportion sources of contribution to the contaminants. Four source factors were identified for the bulk deposition samples, including 'crustal matter/sea salt', 'car exhausts/road side dust', 'industrial dust' and 'aged sea salt/secondary aerosols'. For the tank water samples, apart from these atmospheric deposition related factors which contributed in total to 65% of the total contaminant concentration on average, another six rainwater collection system related factors were identified, including 'plumbing', 'building material', 'galvanizing', 'roofing', 'steel' and 'lead flashing/paint' (contributing in total to 35% of the total concentration on average). The Australian Drinking Water Guideline for lead was exceeded in 15% of the tank water samples. The collection system related factors, in particular the 'lead flashing/paint' factor, contributed to 79% of the lead in the tank water samples on average. The concentration of lead in tank water was found to vary with various environmental and collection system factors, in particular the presence of lead flashing on the roof. The results also indicated the important role of sludge dynamics inside the tank on the quality of tank water.
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Affiliation(s)
- R Huston
- School of Environment, Griffith University, Nathan Campus, Queensland, Australia
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Salisbury AL, High P, Twomey JE, Dickstein S, Chapman H, Liu J, Lester B. A randomized control trial of integrated care for families managing infant colic. Infant Ment Health J 2012; 33:110-122. [PMID: 28520096 DOI: 10.1002/imhj.20340] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
This article presents a randomized clinical trial examining the effectiveness of a unique model of integrated care for the treatment of infant colic. Families seeking help for infant colic were randomized to either the family-centered treatment (TX; n = 31) or standard pediatric care (SC; n = 31). All parents completed 3 days of Infant Behavior Diaries (Barr et al., 1998) and the Colic Symptom Checklist (Lester, 1997), Beck Depression Inventory (Beck & Steer, 1984), and Parenting Stress Index 3rd ed.-SF (Abidin, 1995). TX families were seen three times by a pediatrician and a mental health clinician within 1, 2, and 6 weeks of baseline data. TX families received individualized treatment plans addressing problem areas of sleep, feeding, routine, and family mental health. SC families were seen only by their own healthcare provider. All families were visited at home by a research assistant to retrieve data at 2, 6, and 10 weeks after baseline. Family-based treatment accelerated the rate of reduction of infant crying faster than did standard pediatric care. Infants in the TX group had more hours of sleep at 2 weeks posttreatment and spent less time feeding at 2, 6, and 10 weeks posttreatment than did SC infants. Results indicate that individualized family-based treatment reduces infant colic more rapidly than does standard pediatric care.
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Affiliation(s)
- Amy L Salisbury
- Women & Infants Hospital, Brown Center for the Study of Children at Risk and Warren Alpert Medical School, Brown University
| | - Pamela High
- Warren Alpert Medical School, Brown University and Rhode Island Hospital/Hasbro Children's Hospital
| | - Jean E Twomey
- Women & Infants Hospital, Brown Center for the Study of Children at Risk and Warren Alpert Medical School, Brown University
| | - Susan Dickstein
- Warren Alpert Medical School, Brown University and Bradley Hospital
| | - Heather Chapman
- Warren Alpert Medical School, Brown University and Rhode Island Hospital/Hasbro Children's Hospital
| | - Jing Liu
- Women & Infants Hospital, Brown Center for the Study of Children at Risk and Warren Alpert Medical School, Brown University
| | - Barry Lester
- Women & Infants Hospital, Brown Center for the Study of Children at Risk and Warren Alpert Medical School, Brown University
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Brock J, Jones C, Wells E, Chapman H, Corsini L, Burke K, Brada M. 2064 POSTER Comparing Volumetric Intensity Modulated Arc Therapy With Multiple Static Field Radiosurgery for Brain Metastases. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)71022-x] [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]
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Neutze R, Johansson L, Wöhri A, Katona G, Malmerberg E, Arnlund D, Davidsson J, Wulff M, Groenhof G, Chapman H, Spence J, Fromme P. Potential impact of an X-FEL on time-resolved studies of protein dynamics. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311097777] [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: 11/11/2022] Open
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Chapman H, Pei Z, Waclaw R, Nakafuku M, Campbell K. The role of Gsx2 in the choice between neuronal versus oligodendroglial fates. Dev Biol 2011. [DOI: 10.1016/j.ydbio.2011.05.213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Padilla MB, Reyes AM, Connolly M, Natsui S, Puello A, Chapman H. Examining the policy climate for HIV prevention in the Caribbean tourism sector: a qualitative study of policy makers in the Dominican Republic. Health Policy Plan 2011; 27:245-55. [DOI: 10.1093/heapol/czr021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Garra G, Albino H, Chapman H, Singer AJ, Thode HC. The Impact of Communication Barriers on Diagnostic Confidence and Ancillary Testing in the Emergency Department. J Emerg Med 2010; 38:681-5. [DOI: 10.1016/j.jemermed.2009.01.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2008] [Revised: 12/31/2008] [Accepted: 01/13/2009] [Indexed: 10/21/2022]
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Nelson AJ, Toleikis S, Chapman H, Bajt S, Krzywinski J, Chalupsky J, Juha L, Cihelka J, Hajkova V, Vysin L, Burian T, Kozlova M, Fäustlin RR, Nagler B, Vinko SM, Whitcher T, Dzelzainis T, Renner O, Saksl K, Khorsand AR, Heimann PA, Sobierajski R, Klinger D, Jurek M, Pelka J, Iwan B, Andreasson J, Timneanu N, Fajardo M, Wark JS, Riley D, Tschentscher T, Hajdu J, Lee RW. Soft x-ray free electron laser microfocus for exploring matter under extreme conditions. Opt Express 2009; 17:18271-8. [PMID: 19907618 DOI: 10.1364/oe.17.018271] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We have focused a beam (BL3) of FLASH (Free-electron LASer in Hamburg: lambda = 13.5 nm, pulse length 15 fs, pulse energy 10-40 microJ, 5 Hz) using a fine polished off-axis parabola having a focal length of 270 mm and coated with a Mo/Si multilayer with an initial reflectivity of 67% at 13.5 nm. The OAP was mounted and aligned with a picomotor controlled six-axis gimbal. Beam imprints on poly(methyl methacrylate) - PMMA were used to measure focus and the focused beam was used to create isochoric heating of various slab targets. Results show the focal spot has a diameter of < or =1 microm. Observations were correlated with simulations of best focus to provide further relevant information.
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Affiliation(s)
- A J Nelson
- LawrenceLivermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, USA.
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Huston R, Chan YC, Gardner T, Shaw G, Chapman H. Characterisation of atmospheric deposition as a source of contaminants in urban rainwater tanks. Water Res 2009; 43:1630-40. [PMID: 19171360 DOI: 10.1016/j.watres.2008.12.045] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2008] [Revised: 12/19/2008] [Accepted: 12/22/2008] [Indexed: 05/20/2023]
Abstract
To characterise atmospheric input of chemical contaminants to urban rainwater tanks, bulk deposition (wet+dry deposition) was collected at sixteen sites in Brisbane, Queensland, Australia on a monthly basis during April 2007-March 2008 (N=175). Water from rainwater tanks (22 sites, 26 tanks) was also sampled concurrently. The deposition/tank water was analysed for metals, soluble anions and selected samples were additionally analysed for PAHs, pesticides, phenols, organic & inorganic carbon. Flux (mg/m(2)/d) of total solids mass was found to correlate with average daily rainfall (R(2)=0.49) indicating the dominance of the wet deposition contribution to total solids mass. On average 97% of the total mass of analysed components was accounted for by Cl(-) (25.0%), Na (22.6%), organic carbon (20.5%), NO(3)(-) (10.5%), SO(4)(2-) (9.8%), inorganic carbon (5.7%), PO(4)(3-) (1.6%) and NO(2)(-) (1.5%). For other minor elements the average flux from highest to lowest was in the order of Fe>Al>Zn>Mn>Sr>Pb>Ba>Cu>Se. There was a significant effect of location on flux of K, Sb, Sn, Li, Mn, Fe, Cu, Zn, Ba, Pb and SO(4)(2-) but not other metals or anions. Overall the water quality resulting from the deposition (wet+dry) was good but 10.3%, 1.7% and 17.7% of samples had concentrations of Pb, Cd and Fe respectively greater than the Australian Drinking Water Guidelines (ADWG). This generally occurred in the drier months. In comparison 14.2% and 6.1% of tank samples had total Pb and Zn concentrations exceeding the guidelines. The cumulative mean concentration of lead in deposition was on average only 1/4 of that in tank water over the year at a site with high concentrations of Pb in tank water. This is an indication that deposition from the atmosphere is not the major contributor to high lead concentrations in urban rainwater tanks in a city with reasonable air quality, though it is still a significant portion.
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Affiliation(s)
- R Huston
- School of Environment, Griffith University, Nathan Campus, 170 Kessels Road, Brisbane, Queensland 4108, Australia.
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Barty A, Boutet S, Bogan M, Hau-Riege S, Marchesini S, Sokolowski-Tinten K, Cavalleri A, Dusterer S, Frank M, Bajt S, Hajdu J, Treusch R, Seibert M, Chapman H. Femtosecond dynamic diffraction imaging: X-ray snapshots of ultra-fast nanoscale phenomena. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308096189] [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: 11/11/2022] Open
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Weierstall U, Spence J, Starodub D, Schmidt K, Doak R, Shapiro D, Chapman H, Marchesini S. Diffractive imaging and serial crystallography. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308095834] [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: 11/10/2022] Open
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