Книги з теми "RNA pathogenesis"

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1

Chistyakova, Guzel, Lyudmila Ustyantseva, Irina Remizova, Vladislav Ryumin, and Svetlana Bychkova. CHILDREN WITH EXTREMELY LOW BODY WEIGHT: CLINICAL CHARACTERISTICS, FUNCTIONAL STATE OF THE IMMUNE SYSTEM, PATHOGENETIC MECHANISMS OF THE FORMATION OF NEONATAL PATHOLOGY. au: AUS PUBLISHERS, 2022. http://dx.doi.org/10.26526/monography_62061e70cc4ed1.46611016.

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The purpose of the monograph, which contains a modern view of the problem of adaptation of children with extremely low body weight, is to provide a wide range of doctors with basic information about the clinical picture, functional activity of innate and adaptive immunity, prognostic criteria of postnatal pathology, based on their own research. The specific features of the immunological reactivity of premature infants of various gestational ages who have developed bronchopulmonary dysplasia (BPD) and retinopathy of newborns (RN) from the moment of birth and after reaching postconceptional age (37-40 weeks) are described separately. The mechanisms of their implementation with the participation of factors of innate and adaptive immunity are considered in detail. Methods for early prediction of BPD and RN with the determination of an integral indicator and an algorithm for the management of premature infants with a high risk of postnatal complications at the stage of early rehabilitation are proposed. The information provided makes it possible to personify the treatment, preventive and rehabilitation measures in premature babies. The monograph is intended for obstetricians-gynecologists, neonatologists, pediatricians, allergists-immunologists, doctors of other specialties, residents, students of the system of continuing medical education. This work was done with financial support from the Ministry of Education and Science, grant of the President of the Russian Federation No. MK-1140.2020.7.
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2

Selvarajan, Ramasamy, Rajarshi Kumar Gaur, and Basavaprabhu L. Patil. Plant RNA Viruses: Molecular Pathogenesis and Management. Elsevier Science & Technology, 2023.

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3

Selvarajan, Ramasamy, Rajarshi Kumar Gaur, and Basavaprabhu L. Patil. Plant RNA Viruses: Molecular Pathogenesis and Management. Elsevier Science & Technology Books, 2023.

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4

Vaheri, Antti, James N. Mills, Christina F. Spiropoulou, and Brian Hjelle. Hantaviruses. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780198570028.003.0035.

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Hantaviruses (genus Hantavirus, family Bunyaviridae) are rodent- and insectivore-borne zoonotic viruses. Several hantaviruses are human pathogens, some with 10-35% mortality, and cause two diseases: hemorrhagic fever with renal syndrome (HFRS) in Eurasia, and hantavirus cardiopulmonary syndrome (HCPS) in the Americas. Hantaviruses are enveloped and have a three-segmented, single-stranded, negative-sense RNA genome. The L gene encodes an RNA-dependent RNA polymerase, the M gene encodes two glycoproteins (Gn and Gc), and the S gene encodes a nucleocapsid protein. In addition, the S genes of some hantaviruses have an NSs open reading frame that can act as an interferon antagonist. Similarities between phylogenies have suggested ancient codivergence of the viruses and their hosts to many authors, but increasing evidence for frequent, recent host switching and local adaptation has led to questioning of this model. Infected rodents establish persistent infections with little or no effect on the host. Humans are infected from aerosols of rodent excreta, direct contact of broken skin or mucous membranes with infectious virus, or rodent bite. One hantavirus, Andes virus, is unique in that it is known to be transmitted from person-to-person. HFRS and HCPS, although primarily affecting kidneys and lungs, respectively, share a number of clinical features, such as capillary leakage, TNF-, and thrombocytopenia; notably, hemorrhages and alterations in renal function also occur in HCPS and cardiac and pulmonary involvement are not rare in HFRS. Of the four structural proteins, both in humoral and cellular immunity, the nucleocapsid protein appears to be the principal immunogen. Cytotoxic T-lymphocyte responses are seen in both HFRS and HCPS and may be important for both protective immunity and pathogenesis. Diagnosis is mainly based on detection of IgM antibodies although viral RNA (vRNA) may be readily, although not invariably, detected in blood, urine and saliva. For sero/genotyping neutralization tests/RNA sequencing are required. Formalin-inactivated vaccines have been widely used in China and Korea but not outside Asia. Hantaviruses are prime examples of emerging and re-emerging infections and, given the limited number of rodents and insectivores thus far studied, it is likely that many new hantaviruses will be detected in the near future.
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5

Hughes, Alis, and Lesley Jones. Pathogenic Mechanisms. Oxford University Press, 2014. http://dx.doi.org/10.1093/med/9780199929146.003.0013.

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Huntington’s disease (HD) pathogenesis is complex. In the two decades since the gene and its mutation were discovered, there has been extensive exploration of how the expanded CAG repeat in HTT leads to neurodegeneration in HD. This chapter focuses on the mechanisms that potentially contribute to the dysfunction and death of cells in HD. These include repeat instability and RNA toxicity and the production, processing, modification, and degradation of mutant huntingtin. The effects of mutant HTT on cellular processes such as transcription, transport, neurotransmission, and protein clearance are also described. The interdependence and individual importance of these mechanisms in disease etiology remains to be clarified; however, consideration of each could be important for the development of therapeutic interventions in HD.
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6

Denton, Christopher P., and Pia Moinzadeh. Systemic sclerosis. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199642489.003.0121.

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The term 'scleroderma' describes a group of conditions in which the development of thickened, fibrotic skin is a cardinal feature. This includes localized forms of scleroderma (e.g. morphoea) and also systemic forms of the disease that are more correctly termed systemic sclerosis. Systemic sclerosis (SSc) is a multiorgan, autoimmune disease that has a high clinical burden and mortality, due to affecting the skin as well as internal organs. As with other related diseases there is a female predominance and marked clinical diversity. The pathogenesis of SSc is not fully elucidated; it includes endothelial cell injury fibroblast activation and autoimmunity that lead to skin and internal organ manifestations. The majority of cases exhibit characteristic serum autoantibodies. Some of these antibodies are scleroderma-specific reactivities including anti-centromere (ACA), anti-topoisomerase-1 (ATA or Scl 70) or anti-RNA polymerase III antibodies. These anti-nuclear antibody (ANA) patterns are generally mutually exclusive and serve as useful clinical markers of disease subgroups. Additional subsetting of scleroderma cases, based on the extent of skin sclerosis, permits classification into limited and diffuse subsets. Because of the heterogeneity of the disease patients may suffer from different organ manifestations, such as lung fibrosis, hypertensive renal crisis, severe cardiac disease, gastrointestinal involvement, and pulmonary arterial hypertension. Although outcomes have improved recently, systemic sclerosis still has the highest case-specific mortality of any of the autoimmune rheumatic diseases and requires careful and systematic investigation, management and follow-up. Treatment includes symptomatic strategies with attention to each involved organ system; it is still an area where therapeutic progress and better understanding of pathogenesis is increasingly anticipated.
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7

Meng, X. J. Hepatitis E virus. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780198570028.003.0048.

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Hepatitis E virus (HEV) is a small, non-enveloped, single-strand, positive-sense RNA virus of approximately 7.2 kb in size. HEV is classified in the family Hepeviridae consisting of four recognized major genotypes that infect humans and other animals. Genotypes 1 and 2 HEV are restricted to humans and often associated with large outbreaks and epidemics in developing countries with poor sanitation conditions, whereas genotypes 3 and 4 HEV infect humans, pigs and other animal species and are responsible for sporadic cases of hepatitis E in both developing and industrialized countries. The avian HEV associated with Hepatitis-Splenomegaly syndrome in chickens is genetically and antigenically related to mammalian HEV, and likely represents a new genus in the family. There exist three open reading frames in HEV genome: ORF1 encodes non-structural proteins, ORF2 encodes the capsid protein, and the ORF3 encodes a small phosphoprotein. ORF2 and ORF3 are translated from a single bicistronic mRNA, and overlap each other but neither overlaps ORF1. Due to the lack of an efficient cell culture system and a practical animal model for HEV, the mechanisms of HEV replication and pathogenesis are poorly understood. The recent identification and characterization of animal strains of HEV from pigs and chickens and the demonstrated ability of cross-species infection by these animal strains raise potential public health concerns for zoonotic HEV transmission. It has been shown that the genotypes 3 and 4 HEV strains from pigs can infect humans, and vice versa. Accumulating evidence indicated that hepatitis E is a zoonotic disease, and swine and perhaps other animal species are reservoirs for HEV. A vaccine against HEV is not yet available.
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8

Walters, Douglas B., and Lawrence H. Keith. Compendium of Safety Data Sheets for Research and Industrial Chemicals: Flavor and Fragrance Substances (Compendium of Safety Data Sheets for Research). Vch Pub, 1989.

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9

Gaston, J. S. Hill. Reactive arthritis and enteropathic arthropathy. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199642489.003.0115.

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Reactive arthritis (ReA), and enteropathic arthritis secondary to inflammatory bowel disease, are forms of spondyloarthritis, all of which share an association with HLA B27 and can involve both axial and peripheral joints. Genetic studies strongly implicate the cytokines IL-17 and IL-23 in their pathogenesis, and evidence for autoimmunity is lacking. ReA is triggered by particular bacteria, mainly affecting the gut and genitourinary tract, though infections are sometimes asymptomatic. Classically an acute oligo- or monoarthritis with enthesitis occurs, often with inflammatory back pain, though mild polyarthritis can also occur. Septic and crystal-induced arthritis are the principal differential diagnoses. Extra-articular features may aid diagnosis, which otherwise requires laboratory evidence of preceding infection. Bacterial components traffic to the joint (which is nevertheless sterile), and elicit local proinflammatory immune responses. Most ReA is self-limiting, but persistent cases may require disease-modifying anti-rheumatic drugs or even biologics.
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10

Gaston, J. S. Hill. Reactive arthritis and enteropathic arthropathy. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199642489.003.0115_update_002.

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Анотація:
Reactive arthritis (ReA), and enteropathic arthritis secondary to inflammatory bowel disease, are forms of spondyloarthritis, all of which share an association with HLA B27 and can involve both axial and peripheral joints. Genetic studies strongly implicate the cytokines IL-17 and IL-23 in their pathogenesis, and evidence for autoimmunity is lacking. ReA is triggered by particular bacteria, mainly affecting the gut and genitourinary tract, though infections are sometimes asymptomatic. Classically an acute oligo- or monoarthritis with enthesitis occurs, often with inflammatory back pain, though mild polyarthritis can also occur. Septic and crystal-induced arthritis are the principal differential diagnoses. Extra-articular features may aid diagnosis, which otherwise requires laboratory evidence of preceding infection. Bacterial components traffic to the joint (which is nevertheless sterile), and elicit local pro-inflammatory immune responses. Most ReA is self-limiting, but persistent cases may require disease-modifying anti-rheumatic drugs or even biologics.
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11

Klingenberg, Roland, and Ulf Müller-Ladner. Mechanisms of inflammation. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0270.

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This chapter provides a brief summary of the immune pathogenesis of atherosclerosis, highlighting shared features with inflammatory pathways in rheumatoid arthritis (RA) described in detail in Chapter 25.4. RA constitutes a prototype autoimmune disease primarily affecting the joints but also the heart and vessels associated with increased cardiovascular mortality. Recent years have produced a wealth of novel insights into the diversity of immune cell types which either propagate or dampen inflammation in atherogenesis. Expansion of this inherent anti-inflammatory component carried by regulatory T cells may constitute a new therapeutic target to harness the progression of atherosclerotic cardiovascular disease. Among the various inflammatory mediators involved in RA pathology, cytokines (tumour necrosis factor-α‎ and interleukin-6) have gained major interest as therapeutic targets with approved therapies available. In light of the many common features in the pathogenesis of RA and atherosclerosis, these biologics are currently being evaluated in cardiovascular patients. The recently published CANTOS trial showed that IL-1 inhibition reduced adverse cardiovascular events in patients with coronary artery disease demonstrating that inflammation is a genuine therapeutic target. The near future will provide more information whether inflammation is a bona fide cardiovascular risk factor based on completion of several clinical trials using anti-inflammatory approaches in patients with both cardiovascular disease and rheumatoid arthritis.
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12

Scott, David L., James Galloway, Andrew Cope, Arthur Pratt, and Vibeke Strand, eds. Oxford Textbook of Rheumatoid Arthritis. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780198831433.001.0001.

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This new textbook provides a comprehensive overview of the scientific and clinical aspects of rheumatoid arthritis (RA). Split into eight sections—history, diagnosis, and epidemiology; pathogenesis; clinical presentation; disease assessment; impact on life; non-drug treatments; drug treatments; and management and outcomes—it collects the contemporary ideas about RA and explains the revolutionary changes that have taken place over the past two decades, and indicates areas of future research. Witten by leading clinicians and scientists in the field, each chapter gives a detailed background, key recent advances, areas of doubt, and future directions of research.
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13

Simpson, A., E. Aarons, and R. Hewson. Marburg and Ebola viruses. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780198570028.003.0038.

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Infection with Marburg and Ebola viruses cause haemorrhagic fevers that are characterized by organ malfunction, bleeding complications, and high mortality. The viruses are members of the family Filoviridae, a group of membrane-enveloped filamentous RNA viruses. Five distinct species of the genus Ebolavirus have been reported; the genus Marburgvirus contains only one species. Both Marburg and Ebola virus diseases are zoonotic infections whose primary hosts are thought to be bats. The initial human infection is acquired from wildlife and subsequent person-to-person spread propagates the outbreak until it is brought under control. Ebola and Marburg viruses are classified as hazard or risk group 4 pathogens because of the very high case fatality rates observed for Ebola and Marburg virus diseases, the frequency of person-to-person transmission and community spread, and the lack of an approved vaccine or antiviral therapy. This mandates that infectious materials are handled and studied in maximum containment laboratory facilities. Epidemics have occurred sporadically since the discovery of Marburg in 1967 and Ebola virus in 1976. While some of these outbreaks have been relatively large, infecting a few hundreds of individuals, they have generally occurred in rural settings and have been controlled relatively easily. However, the 2013–2016 epidemic of Ebola virus disease in West Africa was different, representing the first emergence of the Zaire species of Ebola in a high-density urban location. Consequently, this has been the largest recorded filovirus outbreak in both the number of people infected and the range of geographical spread. Many of the reported and confirmed cases were among people living in high-density and impoverished urban environments. The chapter summarizes the most up-to-date taxonomic status of the family Filoviridae. It focuses on Marburg and Ebola viruses in a historical context, culminating in the 2013–2016 outbreak of Ebola virus in West Africa. Virus biology of the most well-studied member is described, with details of the viral genome and the protein machinery necessary to propagate viruses at the molecular and cellular level. This information is used to build a wider-scale virus–host perspective with detail on the pathology and pathogenesis of Ebola virus disease. The consequences of cell infection are examined, together with our current understanding of the immune response to Ebola virus, leading to a broader description of the clinical features of disease. The chapter closes by drawing information together in a section on diagnosis, ecology, prevention, and control.
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14

Isaacs, John D., and Philip M. Brown. Rituximab and abatacept. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199642489.003.0083.

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Two biologics that target cells have been licensed to treat rheumatoid arthritis (RA). Rituximab is a chimeric monoclonal antibody (mAb) against CD20 that depletes B cells; abatacept is a soluble form of CTLA-4 that blocks costimulation and interferes with T-cell function. Both drugs alleviate signs and symptoms of RA and have been shown to retard radiographic progression. Rituximab is licensed for use following failure of tumour necrosis factor (TNF) blockade whereas abatacept's licence permits it use as a first-line biologic. In the United Kingdom, however, the National Institute for Health and Clinical Excellence (NICE) restricts the use of abatacept to patients who develop adverse effects with rituximab or in whom rituximab is contraindicated. As with other biologics, the use of either drug is associated with an enhanced risk of serious infections; additionally, rituximab in particular can cause infusion reactions, requiring prophylaxis. By targeting cells that are central to RA pathogenesis, these drugs provide important additional therapeutic options for patients with RA.
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15

Brown, Matthew A., and John Reveille. Genetics of spondyloarthritis. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780198734444.003.0005.

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In addition to sharing clinical, histopathological, and immunological features, spondyloarthritis (SpA) encompasses a group of diseases that are genetically linked through shared associations with HLA-B27, as well as other genes of the IL-23R and aminopeptidase groups. Great progress has been made since the development of the genome-wide association study approach, with better dissection of the HLA associations of this group of diseases, as well as the discovery of multiple genetic loci found outside of the major histocompatibility complex, in ankylosing spondylitis (AS) in particular. These genetic data shed light on the related pathogenesis of AS and psoriatic arthritis (PsA), inflammatory bowel disease (IBD)-related arthritis, and reactive arthritis (ReA). Genetic associations also strengthen the suggestive data that Behçet’s disease (BD) and Familial Mediterranean Fever (FMF) are related to the more classical forms of SpA.
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16

Howard, Colin R. Arenaviruses. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780198570028.003.0032.

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There are few groups of viral zoonoses that have attracted such widespread publicity as the arenaviruses, particularly during the 1960’s and 1970’s when Lassa emerged as a major cause of haemorrhagic disease in West Africa. More than any other zoonoses, members of the family are used extensively for the study of virus-host relationships. Thus the study of this unique group of enveloped, single-stranded RNA viruses has been pursued for two quite separate reasons. First, lymphocytic choriomeningitis virus (LCM) has been used as a model of persistent virus infections for over half a century; its study has contributed, and continues to contribute, a number of cardinal concepts to our present understanding of immunology. LCM virus remains the prototype of the Arenaviridae and is a common infection of laboratory mice, rats and hamsters. Once thought rare in humans there is now increasing evidence of LCM virus being implicated in renal disease and as a complication in organ transplantation. Second, certain arenaviruses cause severe haemorrhagic diseases in man, notably Lassa fever in Africa, Argentine and Bolivian haemorrhagic fevers in South America, Guaranito infection in Venezuela and Chaparé virus in Bolivia. The latter is a prime example for the need of ever-continuing vigilance for the emergence of new viral diseases; over the past few years several new arenaviruses have been reported as implicated with severe human disease and indeed the number of new arenaviruses discovered since the last edition of this book have increased the size of this virus family significantly.In common with LCM, the natural reservoir of these infections is a limited number of rodent species (Howard, 1986). Although the initial isolates from South America were at first erroneously designated as newly defined arboviruses, there is no evidence to implicate arthropod transmission for any arenavirus. However, similar methods of isolation and the necessity of trapping small animals have meant that the majority of arenaviruses have been isolated by workers in the arbovirus field. A good example of this is Guaranito virus that emerged during investigation of a dengue virus outbreak in Venezuela (Salas et al. 1991).There is an interesting spectrum of pathological processes among these viruses. All the evidence so far available suggests that the morbidity of Lassa fever and South American haemorrhagic fevers due to arenavirus infection results from the direct cytopathic action of these agents. This is in sharp contrast to the immunopathological basis of ‘classic’ lymphocytic choriomeningitis disease seen in adult mice infected with LCM virus and the use of this system for elucidating the phenomenon of H2-restriction of the host cytotoxic T cell response (Zinkernagel and Doherty 1979). Despite the utility of this experimental model for dissecting the nature of the immune response to virus infection and the growing interest in arenaviruses of rodents, there remains much to be done to elucidate the pathogenesis of these infections in humans.
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17

Nakamura, Tomohiro, and Stuart A. Lipton. Neurodegenerative Diseases as Protein Misfolding Disorders. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780190233563.003.0002.

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Neurodegenerative diseases (NDDs) often represent disorders of protein folding. Rather than large aggregates, recent evidence suggests that soluble oligomers of misfolded proteins are the most neurotoxic species. Emerging evidence points to small, soluble oligomers of misfolded proteins as the cause of synaptic dysfunction and loss, the major pathological correlate to disease progression in many NDDs including Alzheimer’s disease. The protein quality control machinery of the cell, which includes molecular chaperones as found in the endoplasmic reticulum (ER), the ubiquitin-proteasome system (UPS), and various forms of autophagy, can counterbalance the accumulation of misfolded proteins to some extent. Their ability to eliminate the neurotoxic effects of misfolded proteins, however, declines with age. A plausible explanation for the age-dependent deterioration of the quality control machinery involves compromise of these systems by excessive generation of reactive oxygen species (ROS), such as superoxide anion (O2-), and reactive nitrogen species (RNS), such as nitric oxide (NO). The resulting redox stress contributes to the accumulation of misfolded proteins. Here, we focus on aberrantly increased generation of NO-related species since this process appears to accelerate the manifestation of key neuropathological features, including protein misfolding. We review the chemical mechanisms of posttranslational modification by RNS such as protein S-nitrosylation of critical cysteine thiol groups and nitration of tyrosine residues, showing how they contribute to the pathogenesis of NDDs.
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18

Dyrberg, Thomas. Role of Viruses and the Immune System in Diabetes Mellitus: Experimental Models. Springer London, Limited, 2013.

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19

Dyrberg, Thomas. Role of Viruses and the Immune System in Diabetes Mellitus: Experimental Models. Springer London, Limited, 2011.

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20

Fleischmann, Roy. Signalling pathway inhibitors. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199642489.003.0081.

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Анотація:
Oral, small-molecule signalling pathway inhibitors, including ones that inhibit the JAK and SyK pathways, are currently in development for the treatment of rheumatoid arthritis (RA). Tofacitinib is an orally administered small-molecule inhibitor that targets the intracellular Janus kinase 3 and 1 (JAK1/3) molecules to a greater extent than JAK2 while baricitinib (formerly INCB028050) predominantly inhibits JAK1/2. Many of the proinflammatory cytokines implicated in the pathogenesis of RA utilize cell signalling that involves the JAK-STAT pathways and therefore inhibition of JAK-STAT signalling, by targeting multiple RA-associated cytokine pathways, has the potential to simultaneously reduce inflammation, cellular activation, and proliferation of key immune cells. Fostamatinib disodium is an orally available inhibitor of spleen tyrosine kinase (SyK), which is a cytoplasmic tyrosine kinase that is an important mediator of immunoreceptor signalling in mast cells, macrophages, neutrophils, and B cells. Interruption of SyK signalling may interrupt production of tumour necrosis factor (TNF) and metalloproteinase and therefore affect RA disease activity. Tofacitinib has been investigated in multiple phase 2 and phase 3 trials which have investigated its efficacy (clinical, functional, and radiographic) and safety in patients who have failed disease-modifying anti-inflammatory drugs (DMARDs) as monotherapy or in combination with DMARDs, compared to an inhibitor of tumour necrosis factor alpha (TNFα‎) and in patients who have failed TNFα‎ inhibitors. The efficacy of fostamatinib and baricitinib has been investigated in phase 2 trials; both are in large phase 3 clinical programmes. Each of these medications has demonstrated efficacy; their safety profile has been shown to be different from each other and from currently approved biological agents. This chapter discusses what is currently known and understood about their efficacy and safety.
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21

Thomas, Dyrberg, ed. The role of viruses and the immune system in diabetes mellitus: Experimental models. Berlin: Springer-Verlag, 1990.

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22

Dyrberg, Thomas. Role Of Viruses And The Immune System In Diabetes Mellitus: EXPERMENTAL MODELS (Current Topics in Microbiology & Immunology). Edited by Thomas Dyrberg. Springer, 1990.

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23

Hadidi, Ahmed, Ricardo Flores, John Randles, and Joseph Semancik. Viroids. CSIRO Publishing, 2003. http://dx.doi.org/10.1071/9780643069855.

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Анотація:
This comprehensive volume presents indispensable and up-to-date information on viroids and viroid diseases. It provides a single source of information on the properties of viroids, the economic impact of viroid diseases, and methods for their detection and control. It examines the diseases associated with different plant species, the geographic distribution and epidemiology of viroids, diseases of possible viroid etiology, and the future applications of viroids. Viroids examines the biology of viroids, molecular characteristics, localization and movement, replication, pathogenesis, viroids and gene silencing, classification, viroid-like satellite RNAs, detection of viroids using bioamplification hosts, biological indexing, polyacrylamide gel electrophoresis, molecular hybridisation and polymerase chain reaction. The book looks at the geographical distribution and epidemiology of viroids in North America, Australasia, China, Japan, Europe, the Middle East, Africa, South America, and at the global level. It covers the control of viroids including quarantine of imported germplasm, availability of viroid-tested propagation materials, thermotherapy, tissue culture, and other conventional strategies as well as biotechnological control approaches. Special topics such as ribozyme reaction of viroids and economic advantages of viroid infection are also included. Other chapters summarise the current state of knowledge concerning viroid diseases of the crop in question and aspects of the natural history of viroids in horticulture. Among the crops covered are potato, tomato, tobacco, cucumber, pome fruits, stone fruits, avocado, citrus, grapevines, hop, chrysanthemum, coleus, columnea, and coconut palm. The four eminent editors of this watershed volume have assembled an international group of more than 70 scientists who have substantial experience with viroids and viroid diseases. They have produced a cohesive and comprehensive work that can be used by students, researchers, extension agents, and regulators. It may also be of a great value to science managers, policy makers, and industries in formulating policies and products to obtain viroid-free plants and control viroid diseases. The information on plant quarantine and certification programs will help anyone concerned with the safe movement of plant material across international boundaries or within a single country.
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