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Akimov D, An P, Awe C, Barbeau P, Becker B, Belov V, Bernardi I, Blackston M, Bock C, Bolozdynya A, Browning J, Cabrera-Palmer B, Chernyak D, Conley E, Daughhetee J, Detwiler J, Ding K, Durand M, Efremenko Y, Elliott S, Fabris L, Febbraro M, Galambos J, Gallo Rosso A, Galindo-Uribarri A, Green M, Heath M, Hedges S, Hoang D, Hughes M, Iverson E, Johnson T, Khromov A, Konovalov A, Kozlova E, Kumpan A, Li L, Link J, Liu J, Mann K, Markoff D, Mastroberti J, McIntyre M, Mueller P, Newby J, Parno D, Penttila S, Pershey D, Rapp R, Ray H, Raybern J, Razuvaeva O, Reyna D, Rich G, Rimal D, Ross J, Rudik D, Runge J, Salvat D, Salyapongse A, Scholberg K, Shakirov A, Simakov G, Sinev G, Snow W, Sosnovstsev V, Suh B, Tayloe R, Tellez-Giron-Flores K, Tolstukhin I, Trotter S, Ujah E, Vanderwerp J, Varner R, Virtue C, Visser G, Wongjirad T, Yen YR, Yoo J, Yu CH, Zettlemoyer J, Zhang S. Simulating the neutrino flux from the Spallation Neutron Source for the COHERENT experiment. Int J Clin Exp Med 2022. [DOI: 10.1103/physrevd.106.032003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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2
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Gericke MT, Baeßler S, Barrón-Palos L, Birge N, Bowman JD, Calarco J, Cianciolo V, Coppola CE, Crawford CB, Fomin N, Garishvili I, Greene GL, Hale GM, Hamblen J, Hayes C, Iverson E, Kabir ML, McCrea M, Plemons E, Ramírez-Morales A, Mueller PE, Novikov I, Penttila S, Scott EM, Watts J, Wickersham C. First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on ^{3}He. Phys Rev Lett 2020; 125:131803. [PMID: 33034491 DOI: 10.1103/physrevlett.125.131803] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 08/04/2020] [Indexed: 06/11/2023]
Abstract
We report the first precision measurement of the parity-violating asymmetry in the direction of proton momentum with respect to the neutron spin, in the reaction ^{3}He(n,p)^{3}H, using the capture of polarized cold neutrons in an unpolarized active ^{3}He target. The asymmetry is a result of the weak interaction between nucleons, which remains one of the least well-understood aspects of electroweak theory. The measurement provides an important benchmark for modern effective field theory and potential model calculations. Measurements like this are necessary to determine the spin-isospin structure of the hadronic weak interaction. Our asymmetry result is A_{PV}=[1.55±0.97(stat)±0.24(sys)]×10^{-8}, which has the smallest uncertainty of any hadronic parity-violating asymmetry measurement so far.
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Affiliation(s)
- M T Gericke
- University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - S Baeßler
- University of Virginia, Charlottesville, Virginia 22904, USA
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - L Barrón-Palos
- Universidad Nacional Autónoma de México, Mexico City, D.F., Mexico
| | - N Birge
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - J D Bowman
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - J Calarco
- University of New Hampshire, Durham, New Hampshire 03824, USA
| | - V Cianciolo
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - C E Coppola
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C B Crawford
- University of Kentucky, Lexington, Kentucky 40526, USA
| | - N Fomin
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - I Garishvili
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - G L Greene
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - G M Hale
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - J Hamblen
- University of Tennessee Chattanooga, Chattanooga, Tennessee 37403, USA
| | - C Hayes
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - E Iverson
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - M L Kabir
- University of Kentucky, Lexington, Kentucky 40526, USA
| | - M McCrea
- University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
- University of Winnipeg, Winnipeg, Manitoba R3B 2E9, Canada
| | - E Plemons
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | | | - P E Mueller
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - I Novikov
- Western Kentucky University, Lexington, Kentucky 40526, USA
| | - S Penttila
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - E M Scott
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - J Watts
- University of Tennessee Chattanooga, Chattanooga, Tennessee 37403, USA
| | - C Wickersham
- University of Tennessee Chattanooga, Chattanooga, Tennessee 37403, USA
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3
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Archambault D, Cheong A, Iverson E, Tremblay KD, Mager J. Protein phosphatase 1 regulatory subunit 35 is required for ciliogenesis, notochord morphogenesis, and cell-cycle progression during murine development. Dev Biol 2020; 465:1-10. [PMID: 32628936 PMCID: PMC7484031 DOI: 10.1016/j.ydbio.2020.06.011] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 06/25/2020] [Accepted: 06/26/2020] [Indexed: 11/20/2022]
Abstract
Protein phosphatases regulate a wide array of proteins through post-translational modification and are required for a plethora of intracellular events in eukaryotes. While some core components of the protein phosphatase complexes are well characterized, many subunits of these large complexes remain unstudied. Here we characterize a loss-of-function allele of the protein phosphatase 1 regulatory subunit 35 (Ppp1r35) gene. Homozygous mouse embryos lacking Ppp1r35 are developmental delayed beginning at embryonic day (E) 7.5 and have obvious morphological defects at later stages. Mutants fail to initiate turning and do not progress beyond the size or staging of normal E8.5 embryos. Consistent with recent in vitro studies linking PPP1R35 with the microcephaly protein Rotatin and with a role in centrosome formation, we show that Ppp1r35 mutant embryos lack primary cilia. Histological and molecular analysis of Ppp1r35 mutants revealed that notochord development is irregular and discontinuous and consistent with a role in primary cilia, that the floor plate of the neural tube is not specified. Similar to other mutant embryos with defects in centriole function, Ppp1r35 mutants displayed increased cell death that is prevalent in the neural tube and an increased number of proliferative cells in prometaphase. We hypothesize that loss of Ppp1r35 function abrogates centriole homeostasis, resulting in a failure to produce functional primary cilia, cell death and cell cycle delay/stalling that leads to developmental failure. Taken together, these results highlight the essential function of Ppp1r35 during early mammalian development and implicate this gene as a candidate for human microcephaly.
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Affiliation(s)
- Danielle Archambault
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, USA
| | - Agnes Cheong
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, USA
| | - Elizabeth Iverson
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, USA
| | - Kimberly D Tremblay
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, USA.
| | - Jesse Mager
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, USA.
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Cheong A, Archambault D, Degani R, Iverson E, Tremblay KD, Mager J. Nuclear-encoded mitochondrial ribosomal proteins are required to initiate gastrulation. Development 2020; 147:dev.188714. [PMID: 32376682 DOI: 10.1242/dev.188714] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 03/30/2020] [Indexed: 12/11/2022]
Abstract
Mitochondria are essential for energy production and although they have their own genome, many nuclear-encoded mitochondrial ribosomal proteins (MRPs) are required for proper function of the organelle. Although mutations in MRPs have been associated with human diseases, little is known about their role during development. Presented here are the null phenotypes for 21 nuclear-encoded mitochondrial proteins and in-depth characterization of mouse embryos mutant for the Mrp genes Mrpl3, Mrpl22, Mrpl44, Mrps18c and Mrps22 Loss of each MRP results in successful implantation and egg-cylinder formation, followed by severe developmental delay and failure to initiate gastrulation by embryonic day 7.5. The robust and similar single knockout phenotypes are somewhat surprising given there are over 70 MRPs and suggest little functional redundancy. Metabolic analysis reveals that Mrp knockout embryos produce significantly less ATP than controls, indicating compromised mitochondrial function. Histological and immunofluorescence analyses indicate abnormal organelle morphology and stalling at the G2/M checkpoint in Mrp null cells. The nearly identical pre-gastrulation phenotype observed for many different nuclear-encoded mitochondrial protein knockouts hints that distinct energy systems are crucial at specific time points during mammalian development.
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Affiliation(s)
- Agnes Cheong
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA 01003, USA
| | - Danielle Archambault
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA 01003, USA
| | - Rinat Degani
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA 01003, USA
| | - Elizabeth Iverson
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA 01003, USA
| | - Kimberly D Tremblay
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA 01003, USA
| | - Jesse Mager
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA 01003, USA
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Angelou CC, Wells AC, Vijayarhagavan J, Dougan CE, Lawlor R, Iverson E, Lazarevic V, Kimura MY, Peyton SR, Minter LM, Osborne BA, Pobezinskaya EL, Pobezinsky LA. Pathogenic Th17 cell differentiation is negatively regulated by let-7 microRNAs in a mouse model of multiple sclerosis. The Journal of Immunology 2020. [DOI: 10.4049/jimmunol.204.supp.76.11] [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] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Autoimmune disorders such as multiple sclerosis (MS) are caused by proinflammatory events mediated by pathogenic Th17 cells. In MS, these cells arise in response to autoantigen recognition and exposure to the cytokines IL-1β and IL-23, migrate to the central nervous system (CNS) by following gradients of CCR2- and CCR5-cognate chemokines, and secrete GM-CSF. GM-CSF is essential for disease development, as it promotes the activation, differentiation, and recruitment of peripheral inflammatory myeloid cells to the CNS that directly demyelinate neurons and damage axons. Th17 cell pathogenicity in MS has been correlated with microRNA (miRNA) dysregulation, which leads to aberrant post-transcriptional regulation of gene expression and enhanced autoreactive phenotype. We found that the lethal-7 (let-7) miRNA family is abundantly expressed in naive CD4+ T cells, but gets dramatically downregulated over time following antigen encounter, indicating that let-7 may control the differentiation of pathogenic Th17 cells. To investigate a potential regulatory role for let-7 in Th17 cell autoreactivity, we used experimental autoimmune encephalomyelitis (EAE), the animal model of MS. Specifically, we demonstrated that let-7 confers protection from EAE by negatively regulating the proliferation, IL-1β/IL-23-dependent differentiation, and CCR2/CCR5-dependent migration of pathogenic Th17 cells to the CNS. Conversely, absence of let-7 led to enhanced Th17 cell autoreactivity and aggravated disease. Therefore, our results identify a novel regulatory role for let-7 miRNAs in pathogenic Th17 differentiation during EAE development, suggesting a promising therapeutic application for the treatment of MS-related autoimmune diseases.
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Angelou CC, Wells AC, Vijayaraghavan J, Dougan CE, Lawlor R, Iverson E, Lazarevic V, Kimura MY, Peyton SR, Minter LM, Osborne BA, Pobezinskaya EL, Pobezinsky LA. Differentiation of Pathogenic Th17 Cells Is Negatively Regulated by Let-7 MicroRNAs in a Mouse Model of Multiple Sclerosis. Front Immunol 2020; 10:3125. [PMID: 32010153 PMCID: PMC6978752 DOI: 10.3389/fimmu.2019.03125] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 12/23/2019] [Indexed: 12/12/2022] Open
Abstract
Multiple sclerosis (MS) is a disabling demyelinating autoimmune disorder of the central nervous system (CNS) which is driven by IL-23- and IL-1β-induced autoreactive Th17 cells that traffic to the CNS and secrete proinflammatory cytokines. Th17 pathogenicity in MS has been correlated with the dysregulation of microRNA (miRNA) expression, and specific miRNAs have been shown to promote the pathogenic Th17 phenotype. In the present study, we demonstrate, using the animal model of MS, experimental autoimmune encephalomyelitis (EAE), that let-7 miRNAs confer protection against EAE by negatively regulating the proliferation, differentiation and chemokine-mediated migration of pathogenic Th17 cells to the CNS. Specifically, we found that let-7 miRNAs may directly target the cytokine receptors Il1r1 and Il23r, as well as the chemokine receptors Ccr2 and Ccr5. Therefore, our results identify a novel regulatory role for let-7 miRNAs in pathogenic Th17 differentiation during EAE development, suggesting a promising therapeutic application for disease treatment.
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Affiliation(s)
- Constance C. Angelou
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Alexandria C. Wells
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Jyothi Vijayaraghavan
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Carey E. Dougan
- Department of Chemical Engineering, University of Massachusetts, Amherst, MA, United States
| | - Rebecca Lawlor
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Elizabeth Iverson
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Vanja Lazarevic
- Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, United States
| | - Motoko Y. Kimura
- Department of Immunology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Shelly R. Peyton
- Department of Chemical Engineering, University of Massachusetts, Amherst, MA, United States
| | - Lisa M. Minter
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Barbara A. Osborne
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Elena L. Pobezinskaya
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Leonid A. Pobezinsky
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
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7
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Pobezinskaya EL, Wells AC, Angelou CC, Fagerberg E, Aral E, Iverson E, Kimura MY, Pobezinsky LA. Survival of Naïve T Cells Requires the Expression of Let-7 miRNAs. Front Immunol 2019; 10:955. [PMID: 31130952 PMCID: PMC6509570 DOI: 10.3389/fimmu.2019.00955] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 04/15/2019] [Indexed: 01/01/2023] Open
Abstract
Maintaining the diversity and constant numbers of naïve T cells throughout the organism's lifetime is necessary for efficient immune responses. Naïve T cell homeostasis, which consists of prolonged survival, occasional proliferation and enforcement of quiescence, is tightly regulated by multiple signaling pathways which are in turn controlled by various transcription factors. However, full understanding of the molecular mechanisms underlying the maintenance of the peripheral T cell pool has not been achieved. In the present study, we demonstrate that T cell-specific deficiency in let-7 miRNAs results in peripheral T cell lymphopenia resembling that of Dicer1 knockout mice. Deletion of let-7 leads to profound T cell apoptosis while overexpression prevents it. We further show that in the absence of let-7, T cells cannot sustain optimal levels of the pro-survival factor Bcl2 in spite of the intact IL-7 signaling, and re-expression of Bcl2 in let-7 deficient T cells completely rescues the survival defect. Thus, we have uncovered a novel let-7-dependent mechanism of post-transcriptional regulation of naïve T cell survival in vivo.
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Affiliation(s)
- Elena L. Pobezinskaya
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Alexandria C. Wells
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Constance C. Angelou
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Eric Fagerberg
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Esengul Aral
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Elizabeth Iverson
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
| | - Motoko Y. Kimura
- Department of Immunology, Graduate School of Medicine, Chiba University, Chiba, Japan
| | - Leonid A. Pobezinsky
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, United States
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8
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Giles J, Patel JR, Miller A, Iverson E, Fitzsimons D, Moss RL. Recovery of left ventricular function following in vivo reexpression of cardiac myosin binding protein C. J Gen Physiol 2019; 151:77-89. [PMID: 30573635 PMCID: PMC6314388 DOI: 10.1085/jgp.201812238] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 08/31/2018] [Accepted: 11/27/2018] [Indexed: 01/26/2023] Open
Abstract
The loss of cardiac myosin binding protein C (cMyBP-C) results in left ventricular dilation, cardiac hypertrophy, and impaired ventricular function in both constitutive and conditional cMyBP-C knockout (MYBPC3 null) mice. It remains unclear whether the structural and functional phenotypes expressed in the MYBPC3 null mouse are reversible, which is an important question, since reduced expression of cMyBP-C is an important cause of hypertrophic cardiomyopathy in humans. To investigate this question, we generated a cardiac-specific transgenic mouse model using a Tet-Off inducible system to permit the controlled expression of WT cMyBP-C on the MYBPC3 null background. Functional Tet-Off mice expressing WT cMyBP-C (FT-WT) were generated by crossing tetracycline transactivator mice with responder mice carrying the WT cMyBP-C transgene. Prior to dietary doxycycline administration, cMyBP-C was expressed at normal levels in FT-WT myocardium, which exhibited similar levels of steady-state force and in vivo left ventricular function as WT mice. Introduction of dietary doxycycline for four weeks resulted in a partial knockdown of cMyBP-C expression and commensurate impairment of systolic and diastolic function to levels approaching those observed in MYBPC 3 null mice. Subsequent withdrawal of doxycycline from the diet resulted in the reexpression of cMyBP-C to levels comparable to those observed in WT mice, along with near-complete recovery of in vivo ventricular function. These results show that the cardiac phenotypes associated with MYBPC3 null mice are reversible. Our work also validates the use of the Tet-Off inducible system as a means to study the mechanisms underlying hypertrophic cardiomyopathy.
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Affiliation(s)
- Jasmine Giles
- Department of Cell and Regenerative Biology, University of Wisconsin School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI
| | - Jitandrakumar R Patel
- Department of Cell and Regenerative Biology, University of Wisconsin School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI
- University of Wisconsin Cardiovascular Research Center, University of Wisconsin School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI
| | - Adam Miller
- Department of Cell and Regenerative Biology, University of Wisconsin School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI
| | - Elizabeth Iverson
- Department of Cell and Regenerative Biology, University of Wisconsin School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI
| | - Daniel Fitzsimons
- Department of Cell and Regenerative Biology, University of Wisconsin School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI
- University of Wisconsin Cardiovascular Research Center, University of Wisconsin School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI
| | - Richard L Moss
- Department of Cell and Regenerative Biology, University of Wisconsin School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI
- University of Wisconsin Cardiovascular Research Center, University of Wisconsin School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI
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9
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Thomas Lynch I, Giles J, Iverson E, Fitzsimons D, Moss R. The hypertrophic cardiomyopathy-causing W792R and T1075 mutations in cardiac myosin binding protein-C generate cardiac dysfunction in mice. J Mol Cell Cardiol 2017. [DOI: 10.1016/j.yjmcc.2017.07.096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Cline A, Hewett L, Iverson E. Benefits of a Program Providing Recipes for Use of Donated Foods to Clients at Local Food Bank Distribution Centers. J Acad Nutr Diet 2013. [DOI: 10.1016/j.jand.2013.06.309] [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: 11/16/2022]
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11
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Crum-Cianflone NF, Collins G, Defang G, Iverson E, Eberly LE, Duplessis C, Maguire J, Ganesan A, Agan BK, Lalani T, Whitman T, Brandt C, Faix D, Blair PJ, Burgess T. Immunoglobulin G subclass levels and antibody responses to the 2009 influenza A (H1N1) monovalent vaccine among human immunodeficiency virus (HIV)-infected and HIV-uninfected adults. Clin Exp Immunol 2012; 168:135-41. [PMID: 22385248 DOI: 10.1111/j.1365-2249.2011.04550.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Immunoglobulin (Ig)G levels are important for antibody vaccine responses and IgG subclass deficiencies have been associated with severe 2009 influenza A (H1N1) infections. Studies have demonstrated variations in immune responses to the H1N1 vaccine, but the aetiology of this is unknown. We determined the associations between pre-vaccination overall and influenza-specific IgG subclass levels and 2009 H1N1-specific antibody responses post-vaccination (robust versus poor at day 28) stratified by human immunodeficiency virus (HIV) status. Logistic regression models were utilized to evaluate whether pre-vaccination IgG subclass levels were associated with the antibody response generated post-vaccination. We evaluated 48 participants as part of a clinical study who were stratified by robust versus poor post-vaccination immune responses. Participants had a median age of 35 years; 92% were male and 44% were Caucasian. HIV-infected adults had a median CD4 count of 669 cells/mm(3) , and 79% were receiving highly active anti-retroviral therapy. HIV-infected participants were more likely to have IgG2 deficiency (<240 mg/dl) than HIV-uninfected individuals (62% versus 4%, P < 0·001). No association of pre-vaccination IgG subclass levels (total or influenza-specific) and the antibody response generated by HIN1 vaccination in either group was found. In summary, pre-vaccination IgG subclass levels did not correlate with the ability to develop robust antibody responses to the 2009 influenza A (H1N1) monovalent vaccine. IgG2 deficiencies were common among HIV-infected individuals but did not correlate with poor influenza vaccine responses. Further investigations into the aetiology of disparate vaccine responses are needed.
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Affiliation(s)
- N F Crum-Cianflone
- Infectious Disease Clinical Research Program, Uniformed Services University of the Health Sciences Naval Medical Research Center, Bethesda, MD 20892, USA.
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12
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Freeman BD, Kennedy CR, Frankel HL, Clarridge B, Bolcic-Jankovic D, Iverson E, Shehane E, Celious A, Zehnbauer BA, Buchman TG. Ethical considerations in the collection of genetic data from critically ill patients: what do published studies reveal about potential directions for empirical ethics research? Pharmacogenomics J 2010; 10:77-85. [PMID: 19997084 PMCID: PMC2860600 DOI: 10.1038/tpj.2009.61] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2009] [Revised: 09/30/2009] [Accepted: 11/04/2009] [Indexed: 01/07/2023]
Abstract
Critical illness trials involving genetic data collection are increasingly commonplace and pose challenges not encountered in less acute settings, related in part to the precipitous, severe and incapacitating nature of the diseases involved. We performed a systematic literature review to understand the nature of such studies conducted to date, and to consider, from an ethical perspective, potential barriers to future investigations. We identified 79 trials enrolling 24 499 subjects. Median (interquartile range) number of participants per study was 263 (116.75-430.75). Of these individuals, 16 269 (66.4%) were Caucasian, 1327 (5.4%) were African American, 1707 (7.0%) were Asian Pacific Islanders and 139 (0.6%) were Latino. For 5020 participants (20.5%), ethnicity was not reported. Forty-eight studies (60.8%) recruited subjects from single centers and all studies examined a relatively small number of genetic markers. Technological advances have rendered it feasible to conduct clinical studies using high-density genome-wide scanning. It will be necessary for future critical illness trials using these approaches to be of greater scope and complexity than those so far reported. Empirical research into issues related to greater ethnic inclusivity, accuracy of substituted judgment and specimen stewardship may be essential for enabling the conduct of such trials.
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Affiliation(s)
- B D Freeman
- Department of Surgery, Washington University School of Medicine, St Louis, MO 63110, USA.
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13
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Burke R, Iverson E, Ferrer R, Balasuriya D, Ryutov T, Neches R, Upperman J. Gaps in Pediatric Disaster Preparedness in a Hospital Network. J Surg Res 2010. [DOI: 10.1016/j.jss.2009.11.226] [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: 11/29/2022]
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14
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Ferrer R, Ramirez M, Sauser K, Chokshi N, Iverson E, Upperman J. QS377. Pediatric Disaster Preparedness: Are We Drilling to Standard? J Surg Res 2009. [DOI: 10.1016/j.jss.2008.11.687] [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: 10/21/2022]
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Chan LS, Kipke MD, Schneir A, Iverson E, Warf C, Limbos MA, Shekelle P. Preventing violence and related health-risking social behaviors in adolescents. Evid Rep Technol Assess (Summ) 2004:1-7. [PMID: 15575098 PMCID: PMC4781000 DOI: 10.1037/e439582005-001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
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De Rosa CJ, Montgomery SB, Hyde J, Iverson E, Kipke MD. HIV risk behavior and HIV testing: a comparison of rates and associated factors among homeless and runaway adolescents in two cities. AIDS Educ Prev 2001; 13:131-148. [PMID: 11398958 DOI: 10.1521/aeap.13.2.131.19739] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This study examined differences in self-reported rates and predictors of HIV testing between homeless and runaway youths in San Diego (N = 1,102) and Los Angeles (N = 1,167). Youths aged 13-23 were recruited from agency and street sites using a stratified probability sampling design. Interviewers administered a structured survey instrument lasting 20 minutes, which assessed youths' involvement in HIV risk-related sexual and drug-use behaviors, contact with outreach workers, and other variables. Significantly more Los Angeles youths (78%) reported testing than did San Diego youths (52%; p < .001). Multivariable analyses controlling for risk behaviors, knowing someone with HIV, and contact with outreach workers indicated that the higher rates of these factors in Los Angeles did not account for the difference in testing rates between the cities. Youths in Los Angeles were still 1.85 times as likely to be tested as San Diego youths (p < .001), possibly a result of differing normative behavior and accessibility of testing services.
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Affiliation(s)
- C J De Rosa
- Division of Adolescent Medicine, Children Hospital Los Angeles, CA 90054-0700, USA.
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Abstract
PURPOSE To describe the service utilization patterns of homeless and runaway youth in a "service-rich" area of Los Angeles, California; identify demographic and other correlates of utilization; and contextualize the findings with qualitative data. METHOD During Phase 1 of this study, survey data were collected from an ethnically diverse sample of 296 youth aged 13-23 years, recruited from both service and natural "hang-out" sites using systematic sampling methods. During Phase 2, qualitative data were collected from 46 youth of varying ethnicities and lengths of time homeless. RESULTS Drop-in centers and shelters were the most commonly used services (reported by 78% and 40%, respectively). Other services were used less frequently [e.g., medical services (28%), substance abuse treatment (10%) and mental health services (9%)]. Utilization rates differed by ethnicity, length of time in Los Angeles, and city of first homeless episode (Los Angeles versus all others). Shelter use was strongly associated with use of all other services. Despite youths' generally positive reactions to services, barriers were described including rules perceived to be restrictive, and concerns youth had about confidentiality and mandated reporting. Youth suggested improvements including more targeted services, more long-term services, revised age restrictions, and more and/or better job training and transitional services to get them off the streets. CONCLUSIONS Because shelters and drop-in centers act as gateways to other services and offer intervention potential for these hard-to-reach youth, it is vital that we understand the perceived barriers to service utilization.
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Affiliation(s)
- C J De Rosa
- Division of Adolescent Medicine, Childrens Hospital Los Angeles, California, USA
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Abstract
PURPOSE To describe the service utilization patterns of homeless and runaway youth in a "service-rich" area (Los Angeles, California); identify demographic and other correlates of utilization; and contextualize the findings with qualitative data. METHOD During Phase 1 of this study, survey data were collected from an ethnically diverse sample of 296 youth aged 13-23 years, recruited from both service and natural "hang-out" sites using systematic sampling methods. During Phase 2, qualitative data were collected from 46 youth of varying ethnicities and lengths of time homeless. RESULTS Drop-in centers and shelters were the most commonly used services (reported by 78% and 40%, respectively). Other services were used less frequently [e.g., medical services (28%) and substance abuse treatment (10%) and mental health services (9%)]. Utilization rates differed by ethnicity, length of time in Los Angeles, and city of first homeless episode (Los Angeles vs. all others). Shelter use was strongly associated with use of all other services. Despite youths' generally positive reactions to services, barriers were described including restrictive rules, confidentiality and reporting problems, and negative interactions with staff members. Youth suggested improvements including more targeted services, more long-term services, revised age restrictions, and more and/or better job training and transitional services to get them off the streets. CONCLUSIONS Because shelters and drop-in centers act as gateways to other services and offer intervention potential for these hard-to-reach youth, it is vital that barriers to use of these services are eliminated.
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Affiliation(s)
- C J De Rosa
- Childrens Hospital Los Angeles and the Department of Pediatrics, University of Southern California, School of Medicine, 90054-0700, USA
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