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O'Lone E, Apple FS, Burton JO, Caskey FJ, Craig JC, de Filippi CR, Forfang D, Hicks KA, Jha V, Mahaffey KW, Mark PB, Rossignol P, Scholes-Robertson N, Jaure A, Viecelli AK, Wang AY, Wheeler DC, White D, Winkelmayer WC, Herzog CA. Defining Myocardial Infarction in trials of people receiving hemodialysis: consensus report from the SONG-HD MI Expert Working group. Kidney Int 2023; 103:1028-1037. [PMID: 37023851 DOI: 10.1016/j.kint.2023.02.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 10/04/2022] [Revised: 01/22/2023] [Accepted: 02/15/2023] [Indexed: 04/08/2023]
Abstract
Cardiovascular disease is the leading cause of death in patients receiving hemodialysis. Currently there is no standardized definition of myocardial infarction (MI) for patients receiving hemodialysis. Through an international consensus process MI was established as the core CVD measure for this population in clinical trials. The Standardised Outcomes in Nephrology Group - Hemodialysis (SONG-HD) initiative convened a multidisciplinary, international working group to address the definition of MI in this population.Based on current evidence, the working group recommends using the 4th Universal Definition of MI with specific caveats with regard to the interpretation of "ischemic symptoms" and performing a baseline 12-lead electrocardiogram to facilitate interpretation of acute changes on subsequent tracings. The working group does not recommend obtaining baseline cardiac troponin values, though does recommend obtaining serial cardiac biomarkers in settings where ischemia is suspected. Application of an evidence-based uniform definition should increase the reliability and accuracy of trial results.
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Affiliation(s)
- E O'Lone
- The University of Sydney, Camperdown, Sydney, Australia.
| | - F S Apple
- Departments of Laboratory Medicine and Pathology, Hennepin Healthcare/Hennepin County Medical Center and University of Minnesota, Minneapolis, Minnesota
| | - J O Burton
- Department of Cardiovascular Sciences, University of Leicester and NIHR Leicester Cardiovascular Biomedical Research Unit, Glenfield Hospital Leicester, Leicester, UK
| | - F J Caskey
- Population Health Sciences, University of Bristol, Southmead Hospital, Bristol, UK
| | - J C Craig
- College of Medicine and Public Health, Flinders University, Adelaide, South Australia, Australia
| | - C R de Filippi
- Inova Heart and Vascular Institute, Falls Church, VA, USA
| | - D Forfang
- The National Forum of ESRD Networks, Kidney Patient Advisory Council (KPAC) WI USA
| | - K A Hicks
- Division of Cardiology and Nephrology, Office of Cardiology, Hematology, Endocrinology, and Nephrology, Center for Drug Evaluation and Research (CDER), United States Food and Drug Administration, Silver Spring, Maryland, USA
| | - V Jha
- George Institute of Global Health, UNSW, New Delhi, India; School of Public Health, Imperial College, London, UK; Prasanna School of Public Health, Manipal Academy of Higher Education, Manipal, India
| | - K W Mahaffey
- The Stanford Center for Clinical Research, Department of Medicine, Stanford University School of Medicine, Stanford, CA
| | - P B Mark
- University of Glasgow, Institute of Cardiovascular and Medical Sciences, Glasgow, UK
| | - P Rossignol
- Université de Lorraine, Centre d'Investigation Clinique Plurithématique 1433 -INSERM- CHRU de Nancy, Inserm U1116 & FCRIN INI-CRCT (Cardiovascular and RenalClinical Trialists), Vandoeuvre-les-Nancy, France; Medical specialties and nephrology -hemodialysis departments, Princess Grace Hospital, and Monaco Private Hemodialysis Centre, Monaco, Monaco
| | - N Scholes-Robertson
- College of Medicine and Public Health, Flinders University, Adelaide, South Australia, Australia
| | - A Jaure
- The University of Sydney, Camperdown, Sydney, Australia; Centre for Kidney Research, Children's Hospital at Westmead, Westmead, NSW, Australia
| | - A K Viecelli
- Department of Nephrology, Princess Alexandra Hospital, Brisbane, Australia
| | - A Y Wang
- Queen Mary Hospital, The University of Hong Kong, Hong Kong, China
| | - D C Wheeler
- University College London, London, United Kingdom
| | - D White
- American Association of Kidney Patients, Tampa, Florida
| | - W C Winkelmayer
- Selzman Institute for Kidney Health, Section of Nephrology, Department of Medicine, Baylor College of Medicine, Houston, Texas
| | - C A Herzog
- Chronic Disease Research Group, Hennepin Healthcare Research Institute,Minneapolis, Minnesota; Division of Cardiology, Department of Medicine, Hennepin Healthcare and University of Minnesota, Minneapolis, Minnesota
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Hausner EA, Hicks KA, Leighton JK, Szarfman A, Thompson AM, Harlow P. Qualification of cardiac troponins for nonclinical use: a regulatory perspective. Regul Toxicol Pharmacol 2013; 67:108-14. [PMID: 23876748 DOI: 10.1016/j.yrtph.2013.07.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 07/10/2013] [Accepted: 07/13/2013] [Indexed: 01/25/2023]
Abstract
The US Food and Drug Administration (FDA) Biomarker Qualification Review Team presents its perspective on the recent qualification of cardiac troponins for use in nonclinical safety assessment studies. The goal of this manuscript is to provide greater transparency into the qualification process and factors that were considered in reaching a regulatory decision. This manuscript includes an overview of the data that were submitted and a discussion of the strengths and shortcomings of these data supporting the qualification decision. The cardiac troponin submission is the first literature-based biomarker application to be reviewed by the FDA and insights gained from this experience may aid future submissions and help streamline the characterization and qualification of future biomarkers.
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Affiliation(s)
- E A Hausner
- Division of Cardiovascular and Renal Products, Center for Drug Evaluation and Research, Office of New Drugs, US Food and Drug Administration, United States.
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Rensing SA, Lang D, Zimmer AD, Terry A, Salamov A, Shapiro H, Nishiyama T, Perroud PF, Lindquist EA, Kamisugi Y, Tanahashi T, Sakakibara K, Fujita T, Oishi K, Shin-I T, Kuroki Y, Toyoda A, Suzuki Y, Hashimoto SI, Yamaguchi K, Sugano S, Kohara Y, Fujiyama A, Anterola A, Aoki S, Ashton N, Barbazuk WB, Barker E, Bennetzen JL, Blankenship R, Cho SH, Dutcher SK, Estelle M, Fawcett JA, Gundlach H, Hanada K, Heyl A, Hicks KA, Hughes J, Lohr M, Mayer K, Melkozernov A, Murata T, Nelson DR, Pils B, Prigge M, Reiss B, Renner T, Rombauts S, Rushton PJ, Sanderfoot A, Schween G, Shiu SH, Stueber K, Theodoulou FL, Tu H, Van de Peer Y, Verrier PJ, Waters E, Wood A, Yang L, Cove D, Cuming AC, Hasebe M, Lucas S, Mishler BD, Reski R, Grigoriev IV, Quatrano RS, Boore JL. The Physcomitrella Genome Reveals Evolutionary Insights into the Conquest of Land by Plants. Science 2007; 319:64-9. [DOI: 10.1126/science.1150646] [Citation(s) in RCA: 1452] [Impact Index Per Article: 85.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Hicks KA, Albertson TM, Wagner DR. EARLY FLOWERING3 encodes a novel protein that regulates circadian clock function and flowering in Arabidopsis. Plant Cell 2001; 13:1281-92. [PMID: 11402160 PMCID: PMC135582 DOI: 10.1105/tpc.13.6.1281] [Citation(s) in RCA: 202] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Higher plants use photoperiodic cues to regulate many aspects of development, including the transition from vegetative to floral development. The EARLY FLOWERING3 (ELF3) gene is required for photoperiodic flowering and normal circadian regulation in Arabidopsis. We have cloned ELF3 by positional methods and found that it encodes a novel 695-amino acid protein that may function as a transcriptional regulator. ELF3 transcript level is regulated in a circadian manner, as is expected of a zeitnehmer input pathway component. Overexpression of the LATE ELONGATED HYPOCOTYL gene, which has been proposed to function as a clock component, did not abolish circadian regulation of ELF3 transcription, providing further evidence that ELF3 is a circadian clock input pathway component.
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Affiliation(s)
- K A Hicks
- Institute of Molecular Biology, University of Oregon, Eugene, Oregon 97403, USA
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Bauman KE, Foshee VA, Ennett ST, Pemberton M, Hicks KA, King TS, Koch GG. The influence of a family program on adolescent tobacco and alcohol use. Am J Public Health 2001; 91:604-10. [PMID: 11291373 PMCID: PMC1446646 DOI: 10.2105/ajph.91.4.604] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVES This study examined a family-directed program's effectiveness in preventing adolescent tobacco and alcohol use in a general population. METHODS Adolescents aged 12 to 14 years and their families were identified by random-digit dialing throughout the contiguous United States. After providing baseline data by telephone interviews, they were randomly allocated to receive or not receive a family-directed program featuring mailed booklets and telephone contacts by health educators. Follow-up telephone interviews were conducted 3 and 12 months after program completion. RESULTS The findings suggested that smoking onset was reduced by 16.4% at 1 year, with a 25.0% reduction for non-Hispanic Whites but no statistically significant program effect for other races/ethnicities. There were no statistically significant program effects for smokeless tobacco or alcohol use onset. CONCLUSIONS The family-directed program was associated with reduced smoking onset for non-Hispanic Whites, suggesting that it is worthy of further application, development, and evaluation.
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Affiliation(s)
- K E Bauman
- Department of Health Behavior and Health Education, School of Public Health, University of North Carolina at Chapel Hill, USA.
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Hicks KA, Poole K, Govier K, Cooper C, Sandeman DD. Examination of the Relationship between Declining Renal Function Associated with Increasing Age, Parathyroid Hormone and the Development of Osteoporosis. Age Ageing 1998. [DOI: 10.1093/ageing/27.suppl_2.17-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Abstract
Photoperiodic responses, such as the daylength-dependent control of reproductive development, are associated with a circadian biological clock. The photoperiod-insensitive early-flowering 3 (elf3) mutant of Arabidopsis thaliana lacks rhythmicity in two distinct circadian-regulated processes. This defect was apparent only when plants were assayed under constant light conditions. elf3 mutants retain rhythmicity in constant dark and anticipate light/dark transitions under most light/dark regimes. The conditional arrhythmic phenotype suggests that the circadian pacemaker is intact in darkness in elf3 mutant plants, but the transduction of light signals to the circadian clock is impaired.
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Affiliation(s)
- K A Hicks
- Institute of Molecular Biology, University of Oregon, Eugene, OR 97403, USA
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Zagotta MT, Hicks KA, Jacobs CI, Young JC, Hangarter RP, Meeks-Wagner DR. The Arabidopsis ELF3 gene regulates vegetative photomorphogenesis and the photoperiodic induction of flowering. Plant J 1996; 10:691-702. [PMID: 8893545 DOI: 10.1046/j.1365-313x.1996.10040691.x] [Citation(s) in RCA: 147] [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] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Flowering in Arabidopsis thaliana is promoted by longday (LD) photoperiods such that plants grown in LD flower earlier, and after the production of fewer leaves, than plants grown in short-day (SD) photoperiods. The early-flowering 3 (elf3) mutant of Arabidopsis, which is insensitive to photoperiod with regard to floral initiation has been characterized elf3 mutants are also altered in several aspects of vegetative photomorphogenesis, including hypocotyl elongation. When inhibition of hypocotyl elongation was measured, elf3 mutant seedlings were less responsive than wild-type to all wavelengths of light, and most notably defective in blue and green light-mediated inhibition. When analyzed for the flowering-time phenotype, elf3 was epistatic to mutant alleles of the blue-light receptor encoding gene, HY4. However, when elf3 mutants were made deficient for functional phytochrome by the introduction of hy2 mutant alleles, the elf3 hy2 double mutants displayed the novel phenotype of flowering earlier than either single mutant while still exhibiting photoperiod insensitivity, indicating that a phytochrome-mediated pathway regulating floral initiation remains functional in elf3 single mutants. In addition, the inflorescences of one allelic combination of elf3 hy2 double mutants form a terminal flower similar to the structure produced by tfk1 single mutants. These results suggest that one of the signal transduction pathways controlling photoperiodism in Arabidopsis is regulated, at least in part, by photoreceptors other than phytochrome, and that the activity of the Arabidopsis inflorescence and floral meristem identity genes may be regulated by this same pathway.
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Affiliation(s)
- M T Zagotta
- Institute of Molecular Biology, University of Oregon, Eugene 97403, USA
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Hicks KA, Kovach JA, Frishberg DP, Wiley TM, Gurczak PB, Vernalis MN. Echocardiographic evaluation of papillary fibroelastoma: a case report and review of the literature. J Am Soc Echocardiogr 1996; 9:353-60. [PMID: 8736022 DOI: 10.1016/s0894-7317(96)90152-2] [Citation(s) in RCA: 24] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Papillary fibroelastomas comprise approximately 7.9% of benign primary cardiac tumors. Although papillary fibroelastomas were at first discovered incidentally at autopsy or during heart surgery, these tumors are increasingly being identified by echocardiography. This article reviews those papillary fibroelastomas detected by transthoracic or transesophageal echocardiography and discusses the echocardiographic features of these tumors, associated symptoms, and management. Echocardiography is important in influencing management decisions regarding excision, valve replacement, and valve repair.
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Affiliation(s)
- K A Hicks
- Department of Medicine, Walter Reed Army Medical Center, Washington, DC 20307, USA
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Hicks KA, Grossman AD. Altering the level and regulation of the major sigma subunit of RNA polymerase affects gene expression and development in Bacillus subtilis. Mol Microbiol 1996; 20:201-12. [PMID: 8861217 DOI: 10.1111/j.1365-2958.1996.tb02501.x] [Citation(s) in RCA: 45] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
In Bacillus subtilis, the major sigma factor, sigma-A (rpoD), and the minor sigma factor, sigma-H (spo0H), are present during growth and are required for the initiation of sporulation. Our experiments indicate that sigma-A and sigma-H compete for binding to core RNA polymerase. We used a fusion of rpoD to the LacI-repressible IPTG-inducible promoter, Pspac, to vary the levels of sigma-A in the cell. Increasing the amount of sigma-A caused a decrease in expression of genes controlled by sigma-H, and a delay in the production of heat-resistant spores. Decreasing the amount of sigma-A, in a strain deleted for the chromosomal rpoD, caused an increase in expression of genes controlled by sigma-H. As rpoD itself is controlled by at least two promoters recognized by RNA polymerase that contains sigma-H, the effect of sigma-A levels on expression of sigma-H-controlled promoters represents a feedback mechanism that might contribute to maintaining appropriate levels of sigma-A. While the level of sigma-A was important for efficient sporulation, our results indicate that the normal transcriptional control of rpoD, in the context of the rpoD operon and the numerous promoters in that operon, is not required for efficient sporulation or germination, provided that the sigma-A level from a heterologous promoter is comparable to that in wild-type cells.
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Affiliation(s)
- K A Hicks
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Hicks KA, Currie CT. Patterns of geriatric orthopaedic liaison in Scotland. Health Bull (Edinb) 1996; 54:10-2. [PMID: 8820223] [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] [Indexed: 02/02/2023]
Abstract
Despite increasing interest in collaboration between geriatricians and orthopaedic surgeons in the care of elderly trauma patients, there has been no systematic study to date of the extent of this collaboration in Scotland. This survey establishes the present patterns of such arrangements.
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Hicks KA, Grossman AD. Characterization of csh203::Tn917lac, a mutation in Bacillus subtilis that makes the sporulation sigma factor sigma-H essential for normal vegetative growth. J Bacteriol 1995; 177:3736-42. [PMID: 7601838 PMCID: PMC177090 DOI: 10.1128/jb.177.13.3736-3742.1995] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
spo0H encodes a sigma factor, sigma-H, of RNA polymerase that is required for sporulation in Bacillus subtilis. Null mutations in spo0H block the initiation of sporulation but have no obvious effect on vegetative growth. We have characterized an insertion mutation, csh203::Tn917lac, that makes spo0H essential for normal growth. In otherwise wild-type cells, the csh203::Tn917lac insertion mutation has no obvious effect on cell growth, viability, or sporulation. However, in combination with a mutation in spo0H, the csh203 mutation causes a defect in vegetative growth. The csh203::Tn917lac insertion mutation was found to be located within orf23, the first gene of the rpoD (sigma-A) operon. The transposon insertion separates the major vegetative promoters P1 and P2 from the coding regions of two essential genes, dnaG (encoding DNA primase) and rpoD (encoding the major sigma factor, sigma-A) and leaves these genes under the control of minor promoters, including P4, a promoter controlled by sigma-H. The chs203 insertion mutation caused a 2- to 10-fold increase in expression of promoters recognized by RNA polymerase containing sigma-H. The increased expression of genes controlled by sigma-H in the csh203 single mutant, as well as the growth defect of the csh203 spo0H double mutant, was due to effects on rpoD and not to a defect in orf23 or dnaG.
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Affiliation(s)
- K A Hicks
- Department of Biology, Massachusetts Institute of Technology, Cambridge 02139, USA
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Pelosi E, Hicks KA, Sacks SL, Coen DM. Heterogeneity of a herpes simplex virus clinical isolate exhibiting resistance to acyclovir and foscarnet. Adv Exp Med Biol 1992; 312:151-8. [PMID: 1325102 DOI: 10.1007/978-1-4615-3462-4_15] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Resistance of herpes simplex virus to acyclovir is a problem of growing clinical importance. Acyclovir-resistance can be due either to mutations in the viral thymidine kinase gene or in the viral DNA polymerase gene. Although clinical resistance has most frequently been associated with thymidine kinase alterations, heterogeneity in clinical isolates has not been addressed frequently. The potential for such heterogeneity has been emphasized by a report describing a pathogenic clinical isolate containing within its population at least one thymidine kinase-proficient DNA polymerase mutant as well as mutants exhibiting thymidine kinase-deficiency (Sacks, et al., 1989). We provide here additional characterization of this isolate and speculations regarding its significance.
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Affiliation(s)
- E Pelosi
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts
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Sacks SL, Wanklin RJ, Reece DE, Hicks KA, Tyler KL, Coen DM. Progressive esophagitis from acyclovir-resistant herpes simplex. Clinical roles for DNA polymerase mutants and viral heterogeneity? Ann Intern Med 1989; 111:893-9. [PMID: 2554768 DOI: 10.7326/0003-4819-111-11-893] [Citation(s) in RCA: 144] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Clinically acquired acyclovir resistance in herpes simplex has usually been associated with a deficiency in viral thymidine kinase, which, in turn, has been linked with attenuated virulence in animal models. Diminished pathogenicity in thymidine kinase-deficient isolates has been partly responsible for controversies about the clinical significance of antiviral resistance. We report on a series of resistant virus isolates from a patient who had severe, progressive esophagitis. These isolates had various thymidine kinase activities, ranging from 2.8% to 130% when compared with the activity of the isolate obtained before treatment; the resistant isolate 615 retained enzyme activity as well as neurovirulence in an encephalitis model. Plaque purification showed a heterogeneous mixture containing at least one acyclovir-resistant, foscarnet-resistant plaque isolate (615.8) fully able to phosphorylate acyclovir. The 3.3-kbp BamHI fragment containing most of the DNA polymerase gene from isolate 615.8 was purified and used to successfully transfer both acyclovir and foscarnet resistance. Acquisition of in-vitro acyclovir resistance was associated with progression of clinical disease, as well as with maintenance of pathogenicity in an animal model and at least one mutation in viral DNA polymerase. Patients with herpes simplex infections that progress during acyclovir therapy should be observed for acquisition of resistance in the setting of antiviral chemotherapy; future studies should also consider the presence of heterogeneous virus populations in such patients.
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Affiliation(s)
- S L Sacks
- University of British Columbia, Vancouver
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Leib DA, Bogard CL, Kosz-Vnenchak M, Hicks KA, Coen DM, Knipe DM, Schaffer PA. A deletion mutant of the latency-associated transcript of herpes simplex virus type 1 reactivates from the latent state with reduced frequency. J Virol 1989; 63:2893-900. [PMID: 2542601 PMCID: PMC250836 DOI: 10.1128/jvi.63.7.2893-2900.1989] [Citation(s) in RCA: 275] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
We have generated and characterized a deletion mutant of herpes simplex virus type-1, dlLAT1.8, which lacks the putative promoter region, transcriptional start site, and 1,015 base pairs of the DNA sequences specifying the latency-associated transcripts (LATs). When tested in a CD-1 mouse ocular model, dlLAT1.8 was replication competent in the eye and in ganglia during acute infection but reactivated from explant cultures of ganglia with reduced efficiency (49%) relative to those of wild-type and marker-rescued viruses (94 and 85%, respectively) despite the fact that levels of mutant viral DNA in ganglia during latent infection were comparable to wild-type levels. The neurovirulence of KOS was not significantly altered by the removal of sequences specifying the LATs, as judged by numbers of animals dying on or before 30 days postinfection. Examination of ganglia latently infected with dlLAT1.8 by in situ hybridization revealed no LAT expression. The genotype of reactivated virus was identical to that of input dlLAT1.8 virus as judged by Southern blot analysis. These studies suggest that although the LATs are not essential for the establishment and reactivation of latency in our model, they may play a role in determining the frequency of reactivation of virus from the latent state.
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Affiliation(s)
- D A Leib
- Laboratory of Tumor Virus Genetics, Dana-Farber Cancer Institute, Boston, Massachusetts
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Leib DA, Coen DM, Bogard CL, Hicks KA, Yager DR, Knipe DM, Tyler KL, Schaffer PA. Immediate-early regulatory gene mutants define different stages in the establishment and reactivation of herpes simplex virus latency. J Virol 1989; 63:759-68. [PMID: 2536101 PMCID: PMC247748 DOI: 10.1128/jvi.63.2.759-768.1989] [Citation(s) in RCA: 309] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Using nonsense and deletion mutants of herpes simplex virus type 1, we investigated the roles of three immediate-early proteins (ICP4, ICP27 and ICP0) in the establishment and reactivation of ganglionic latency in a mouse ocular model. DNA hybridization, superinfection-rescue, and cocultivation techniques provided quantitative data that distinguished between the failure of a virus to establish latency in the ganglion and its failure to reactivate. Null mutants with lesions in the genes for ICP4 and ICP27 did not replicate in the eye or in ganglia and failed to establish reactivatable latent infections. Three ICP0 deletion mutants which could replicate in the eye and ganglia varied in their ability to establish and reactivate from the latent state, demonstrating that ICP0 plays a role both in the establishment and the reactivation of latency. The use of viral mutants and a variety of stage-specific assays allowed us to better define the stages in the establishment and reactivation of herpes simplex virus type 1 latency.
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Affiliation(s)
- D A Leib
- Laboratory of Tumor Virus Genetics, Dana-Farber Cancer Institute, Boston, Massachusetts
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17
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Gillis RA, Dias Souza J, Hicks KA, Mangel AW, Pagani FD, Hamilton BL, Garvey TQ, Pace DG, Browne RK, Norman WP. Inhibitory control of proximal colonic motility by the sympathetic nervous system. Am J Physiol 1987; 253:G531-9. [PMID: 2889367 DOI: 10.1152/ajpgi.1987.253.4.g531] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The purpose of this study is to determine whether or not the sympathetic nervous system provides a tonic inhibitory input to the colon in chloralose-anesthetized cats. Proximal and midcolonic motility were monitored using extraluminal force transducers. An intravenous bolus injection of 5 mg of phentolamine in 14 animals elicited a pronounced increase in proximal colon contractility. The minute motility index changed from 0 +/- 0 to 26 +/- 4 after phentolamine administration. Midcolonic motility also increased in response to phentolamine. Specific blockade of alpha 2-receptors, but not alpha 1-receptors, caused the same response seen with phentolamine. alpha-Adrenergic blockade increased colon contractility after spinal cord transection but not after ganglionic blockade. Blockade of alpha-adrenergic receptors was also performed before vagal and pelvic nerve stimulation and in both cases increased colonic motility. Vagal stimulation alone had no effect on colonic contractility, while pelvic nerve stimulation increased motility at the midcolon. alpha-Receptor blockade did not alter the ineffectiveness of vagal stimulation but did unmask excitatory effects of pelvic nerve stimulation on the proximal colon. All excitatory colonic responses were prevented by blocking muscarinic cholinergic receptors. These data indicate that tonic sympathetic nervous system activity exerts an inhibitory effect on colonic motility. The inhibitory effect is mediated through alpha 2-adrenergic receptors. Based on these findings, we suggest that alterations in sympathetic nervous system activity may be extremely important for the regulation of circular muscle contractions in the colon.
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Affiliation(s)
- R A Gillis
- Department of Pharmacology, Georgetown University School of Medicine, Washington, DC 20007
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Pankhurst CL, Waite IM, Hicks KA, Allen Y, Harkness RD. The influence of oral contraceptive therapy on the periodontium--duration of drug therapy. J Periodontol 1981; 52:617-20. [PMID: 6946203 DOI: 10.1902/jop.1981.52.10.617] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Hicks KA, Bradley J. A method of fixation following the vertical midline split during the anterior maxillary osteotomy. Br J Oral Surg 1974; 11:265. [PMID: 4526026 DOI: 10.1016/0007-117x(74)90113-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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