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Article

Modulation of choroidal neovascularization by subretinal injection of retinal pigment epithelium and polystyrene microbeads

by Adam Marcus; Hans Grossniklaus; Hua Yang; I Schmack; L Berglin; X Nie; J Wen; SJ Kang; MJ Lynn; JA Kapp

2009

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Purpose: The study was conducted to create a rapidly developing and reproducible animal model of subretinal choroidal neovascularization (CNV) that allows a time-dependent evaluation of growth dynamics, histopathologic features, and cytokine expression. Methods: C57BL/6 and chemoattractant leukocyte protein-2 deficient (ΔCcl-2) mice were studied. Mice received single or combined subretinal injections of cultured retinal pigment epithelium (RPE; C57BL/ 6-derived), polystyrene microbeads, or phosphate buffer solution (PBS). Fluorescence angiograms were performed over a period of 3 weeks. Mice were euthanized on post inoculation day 3, 7, 10, 14, or 21, and their eyes were evaluated by light, confocal, and electron microscopy. Results: CNV membranes occurred in all study groups with an overall incidence of 94.3%. They extended in the subretinal space through central breaks in Bruch's membrane. CNV lesions were characterized by dynamic changes such as initiation, active inflammatory, and involution stages. CNV thickness peaked around PI day 7 and was greater in mice that received combined injections of RPE and microbeads or RPE cells alone. Small lesions developed in the control groups (microbeads or PBS only), in ΔCcl-2, and old C57BL/6 mice. Variable expression of cytokines and growth factors was detected within the membranes. Conclusions: Our murine model represents a reliable approach inducing CNV growth by subretinal injection of either RPE cells alone or RPE cells and microbeads. The development of CNV lesions is a dynamic process that relies in part on macrophage trafficking and age. © 2009 Molecular Vision.

Chapter

Termination of Transcription of Short Noncoding RNAs by RNA Polymerase II

by Daniel Reines; KM Arndt

2015-01-01

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The RNA polymerase II transcription cycle is often divided into three major stages: initiation, elongation, and termination. Research over the last decade has blurred these divisions and emphasized the tightly regulated transitions that occur as RNA polymerase II synthesizes a transcript from start to finish. Transcription termination, the process that marks the end of transcription elongation, is regulated by proteins that interact with the polymerase, nascent transcript, and/or chromatin template. The failure to terminate transcription can cause accumulation of aberrant transcripts and interfere with transcription at downstream genes. Here, we review the mechanism, regulation, and physiological impact of a termination pathway that targets small noncoding transcripts produced by RNA polymerase II. We emphasize the Nrd1-Nab3-Sen1 pathway in yeast, in which the process has been extensively studied. The importance of understanding small RNA termination pathways is underscored by the need to control noncoding transcription in eukaryotic genomes.

Conference

Lymphadenectomy for Adrenocortical Carcinoma: Is there a Therapeutic Benefit?

by Shishir Maithel; J Gerry; LM Postlewait; J Prescott; T Wang; JA Glenn; J Phay; K Keplinger; RC Fields; L Jin; S Weber; AI Salem; J Sicklick; S Gad; A Yopp; J Mansour; Q Duh; N Seiser; CC Solorzano; CM Kiernan; K Votanopoulos; EA Levine; I Hatzaras; R Shenoy; TM Pawlik; G Poultsides

2016-02-01

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Background: Lymph node metastasis is an established predictor of poor outcome for adrenocortical carcinoma (ACC); however, routine lymphadenectomy during surgical resection of ACC is not widely performed and its therapeutic role remains unclear. Methods: Patients undergoing margin-negative resection for localized ACC were identified from a multi-institutional database. Patients were stratified into 2 groups based on the surgeon’s effort or not to perform a lymphadenectomy as documented in the operative note. Clinical, pathologic, and outcome data were compared between the 2 groups. Results: Of 120 patients who met inclusion criteria from 1993 to 2014, 32 (27 %) underwent lymphadenectomy. Factors associated with lymphadenectomy were tumor size (12 vs. 9.5 cm; p = .007), palpable mass at presentation (26 vs. 12 %; p = .07), suspicious lymph nodes on preoperative imaging (44 vs. 7 %; p < .001), and need for multivisceral resection (78 vs. 36 %; p < .001). Median number of lymph nodes harvested was higher in the lymphadenectomy group (5.5 vs. 0; p < .001). In-hospital mortality (0 vs. 1.3 %; p = .72) and grade 3/4 complication rates (0 vs. 12 %; p = .061) were not significantly different. Patients who underwent lymphadenectomy had improved overall survival (5-year 76 vs. 59 %; p = .041). The benefit of lymphadenectomy on overall survival persisted on multivariate analysis (HR = 0.17; p = .006) controlling for adverse preoperative and intraoperative factors associated with lymphadenectomy, such as tumor size, palpable mass, irregular tumor edges, suspicious nodes on imaging, and multivisceral resection. Conclusions: In this multicenter study of adrenocortical carcinoma patients undergoing R0 resection, the surgeon’s effort to dissect peritumoral lymph nodes was independently associated with improved overall survival.

Article

CD40L adjuvant for DNA/MVA vaccine: enhanced protection from acquisition of neutralization sensitive & neutralization resistant mucosal SIV infections

by S. Kwa; S. Sadagopal; J. Hong; Sailaja Gangadhara; Rajit Basu; Lilin Lai; S. Iyer; Koichi Araki; P.L. Earl; L. Wyatt; Francois Villinger; B. Moss; Rafi Ahmed; Rama Amara

2012

Subjects
  • Biology, Microbiology
  • Biology, Virology
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Article

GM-CSF co-expressing DNA/MVA vaccine, prevention of acquisition by two series of SIVE660 challenges followed by a series of SIV251 challenges

by H. Robinson; S. Kannanganat; Sailaja Gangadhara; Lilin Lai; Tianwei Yu; P. Kozlowski; P. Earl; B. Moss; Rama Amara

2012

Subjects
  • Biology, Virology
  • Health Sciences, Public Health
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Article

Accounting for the Influence of Inflammation on Retinol Binding Protein in a Population Survey of Liberian Preschool-Aged Children

by Leila Margaret Larson; O. Addo; Fanny Sandalinas; Katherine Faigao; Roland Kupka; Rafael Flores-Ayala; Parminder Suchdev

2015

Subjects
  • Health Sciences, Nutrition
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Vitamin A deficiency (VAD) is an important contributor to child morbidity and mortality. The prevalence of VAD, measured by retinol-binding protein (RBP) or retinol, is overestimated in populations with a high prevalence of inflammation. We aimed to quantify and adjust for the effect of inflammation on VAD prevalence in a nationally representative survey of Liberian children 6 to 35months of age. We compared five approaches to adjust RBP for inflammation and estimate VAD prevalence (defined as RBP<0.7μmol/L): (1) ignoring inflammation; (2) excluding individuals with inflammation (C-reactive protein (CRP) >5mg/L or alpha1-acid glycoprotein (AGP) >1g/)L; (3) multiplying each individual's RBP by an internal correction factor; (4) by an external correction factor; and (5) using regression (corrected RBP=exp(InRBP - β1(lnCRPobs-lnCRPref) - β2(lnAGPobs-lnAGPref)). Corrected RBP was based on a regression model where reference lnCRP and lnAGP were set to the maximum of the lowest decile. The unadjusted prevalence of VAD was 24.7%. Children with elevated CRP and/or AGP had significantly lower RBP concentrations than their apparently healthy peers (geometric mean RBP 0.79μmol/L (95% CI: 0.76, 0.82) vs. 0.95μmol/L (95% CI: 0.92, 0.97), P<0.001). Using approaches 2-5 resulted in a prevalence of VAD of 11.6%, 14.3%, 13.5% and 7.3%, respectively. Depending on the approach, the VAD prevalence is reduced 10-17 percentage points when inflammation is taken into account. Further quantification of the influence of inflammation on biomarkers of vitamin A status from other national surveys is needed to compare and recommend the preferred adjustment approach across populations.

Article

High Doses of GM-CSF Inhibit Antibody Responses in Rectal Secretions and Diminish Modified Vaccinia Ankara/Simian Immunodeficiency Virus Vaccine Protection in TRIM5 alpha-Restrictive Macaques

by Himalee Sabnis; Rama Amara; Harriet Robinson; S Kannanganat; LS Wyatt; S Gangadhara; V Chamcha; LS Chea; PA Kozlowski; CC LaBranche; L Chennareddi; B Lawson; PBJ Reddy; TM Styles; TH Vanderford; DC Montefiori; B Moss

2016

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We tested, in rhesus macaques, the effects of a 500-fold range of an admixed recombinant modified vaccinia Ankara (MVA) expressing rhesus GM-CSF (MVA/GM-CSF) on the immunogenicity and protection elicited by an MVA/SIV macaque 239 vaccine. High doses of MVA/GM-CSF did not affect the levels of systemic envelope (Env)-specific Ab, but it did decrease the expression of the gut-homing receptor α4β7 on plasmacytoid dendritic cells (p < 0.01) and the magnitudes of Env-specific IgA (p = 0.01) and IgG (p < 0.05) in rectal secretions. The protective effect of the vaccine was evaluated using 12 weekly rectal challenges in rhesus macaques subgrouped by tripartite motif-containing protein 5a (TRIM5a) genotypes that are restrictive or permissive for infection by the challenge virus SIVsmE660. Eight of nine TRIM5a-restrictive animals receiving no or the lowest dose (1 × 10 5 PFU) of MVA/GM-CSF resisted all 12 challenges. In the comparable TRIM5α-permissive group, only 1 of 12 animals resisted all 12 challenges. In the TRIM5a-restrictive animals, but not in the TRIM5α-permissive animals, the number of challenges to infection directly correlated with the magnitudes of Env-specific rectal IgG (r = +0.6) and IgA (r = +0.6), the avidity of Env-specific serum IgG (r = +0.5), and Ab dependent cell-mediated virus inhibition (r = +0.6). Titers of neutralizing Ab did not correlate with protection. We conclude that 1) protection elicited by MVA/SIVmac239 is strongly dependent on the presence of TRIM5a restriction, 2) nonneutralizing Ab responses contribute to protection against SIVsmE660 in TRIM5a-restrictive animals, and 3) high doses of codelivered MVA/GM-CSF inhibit mucosal Ab responses and the protection elicited by MVA expressing noninfectious SIV macaque 239 virus-like particles.

Article

Gene methylation biomarkers in sputum as a classifier for lung cancer risk

by Shuguang Leng; Guodong Wu; Donna M. Klinge; Cynthia L. Thomas; Elia Casas; Maria A. Picchi; Christine A. Stidley; Sandra J. Lee; Seena Aisner; Jill M. Siegfried; Suresh Ramalingam; Fadlo Khuri; Daniel D. Karp; Steven A. Belinsky

2017

Subjects
  • Health Sciences, Oncology
  • Health Sciences, Pharmacology
  • Biology, Genetics
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CT screening for lung cancer reduces mortality, but will cost Medicare ~2 billion dollars due in part to high false positive rates. Molecular biomarkers could augment current risk stratification used to select smokers for screening. Gene methylation in sputum reflects lung field cancerization that remains in lung cancer patients postresection. This population was used in conjunction with cancer-free smokers to evaluate classification accuracy of a validated eight-gene methylation panel in sputum for cancer risk. Sputum from resected lung cancer patients (n=487) and smokers from Lovelace (n=1380) and PLuSS (n=718) cohorts was studied for methylation of an 8-gene panel. Area under a receiver operating characteristic curve was calculated to assess the prediction performance in logistic regressions with different sets of variables. The prevalence for methylation of all genes was significantly increased in the ECOG-ACRIN patients compared to cancer-free smokers as evident by elevated odds ratios that ranged from 1.6 to 8.9. The gene methylation panel showed lung cancer prediction accuracy of 82-86% and with addition of clinical variables improved to 87-90%. With sensitivity at 95%, specificity increased from 25% to 54% comparing clinical variables alone to their inclusion with methylation. The addition of methylation biomarkers to clinical variables would reduce false positive screens by ruling out onethird of smokers eligible for CT screening and could increase cancer detection rates through expanding risk assessment criteria.

Article

Protocol for the Emory University African American Vaginal, oral, and gut microbiome in pregnancy cohort study (vol 17, 161, 2017)

by Timothy Read; Anne Dunlop; Jennifer Mulle; Elizabeth Corwin; Carol Hogue; Bradley Pearce; Cherie Hill

2017

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© 2017 The Author(s). Following publication of the original article [1], the authors pointed out that the Methods included one step that is no longer necessary but which was inadvertently carried over from an earlier protocol.

Article

Accurate characterization of extravascular lung water in acute respiratory distress syndrome

by David Berkowitz; Pajman A. Danai; Stephanie Eaton; Marc Moss; Greg Martin

2008

Subjects
  • Health Sciences, General
  • Health Sciences, Toxicology
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OBJECTIVES:: Measurements of extravascular lung water (EVLW) correlate to the degree of pulmonary edema and have substantial prognostic information in critically ill patients. Prior studies using single indicator thermodilution have reported that 21% to 35% of patients with clinical acute respiratory distress syndrome (ARDS) have normal EVLW (<10 mL/kg). Given that lung size is independent of actual body weight, we sought to determine whether indexing EVLW to predicted or adjusted body weight affects the frequency of increased EVLW in patients with ARDS. DESIGN:: Prospective, observational cohort study. SETTING:: Medical and surgical intensive care units at two academic hospitals. PATIENTS:: Thirty patients within 72 hrs of meeting American-European Consensus Conference definition of ARDS and 14 severe sepsis patients without ARDS. INTERVENTIONS:: None. MEASUREMENT AND MAIN RESULTS:: EVLW was measured for 7 days by PiCCO transpulmonary thermodilution; 225 measurements of EVLW indexed to actual body weight (ActBW) were compared with EVLW indexed to predicted body weight (PBW) and adjusted body weight (AdjBW). Mean EVLW indexed to ActBW was 12.7 mg/kg for ARDS patients and 7.8 mg/kg for non-ARDS sepsis patients (p < .0001). In all patients, EVLW increased an average of 1.1 ± 2.1 mL/kg when indexed to AdjBW and 2.0 ± 4.1 mL/kg when indexed to PBW. Indexing EVLW to PBW or AdjBW increased the proportion of ARDS patients with elevated EVLW (each p < .05) without increasing the frequency of elevated EVLW in non-ARDS patients. EVLW indexed to PBW had a stronger correlation to Lung Injury Score (r = .39 vs. r = .17) and Pao2/Fio2 ratio (r = .25 vs. r = .10) than did EVLW indexed to ActBW. CONCLUSIONS:: Indexing EVLW to PBW or AdjBW reduces the number of ARDS patients with normal EVLW and correlates better to Lung Injury Score and oxygenation than using ActBW. Studies are needed to confirm the presumed superiority of this method for diagnosing ARDS and to determine the clinical treatment implications.
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