Immunopathogenesis: Insights for Current and Future Therapies
|
|
- Melvin Willis
- 5 years ago
- Views:
Transcription
1 REVIEW Immunopathogenesis: Insights for Current and Future Therapies John M. Vierling, M.D., F.A.C.P. Autoimmune hepatitis (AIH) is a chronic, progressive, necroinflammatory disease caused by loss of tolerance to hepatic autoantigens or their molecular mimics. 1 In AIH, adaptive immune responses against hepatic autoantigens appear to require immunogenetic susceptibility, an autoreactive immune repertoire, environmental triggering, and dysfunctional immunoregulation (Fig. 1). 2 In the absence of validated biomarkers, the diagnosis of AIH requires exclusion of other viral, genetic, or drug-induced etiologies and the presence of characteristic histological features of interface hepatitis, clinical and laboratory findings, autoantibodies, and elevated levels of immunoglobulin G (IgG). 1 AIH is currently subclassified on the basis of autoantibodies into type 1 (antinuclear antibodies [ANA] and/or anti-smooth muscle antibodies [ASMA]) autoantibodies) and type 2 (anti-lkm-1). 3 Appreciation of the key concepts of immunopathogenesis can aid clinicians in the choice of immunosuppressive medications and provide the background required to understand future therapies. Immunologic Microenvironment of the Liver The liver is an immunologic organ, and its microenvironment directly influences AIH and other liver diseases. 2 It contains large numbers of activated Kupffer cells (KCs) and immature antigen-presenting cells (APCs) and greater concentrations of natural killer, natural killer T, and gdt cells than found in blood. It produces complement and acute phase reactant proteins, as well as circulating growth factors and cytokines. The liver normally must constrain immune reactions to food antigens, intestinal pathogen-associated molecular patterns (PAMPs), danger-associated molecular patterns (DAMPs), and xenobiotics while remaining capable of robust innate and adaptive responses against pathogens or tumors. PAMPs in portal venous blood induce production of interleukin (IL)210, creating an immunosuppressive environment. However, excessive PAMPs or DAMPs induce secretion of proinflammatory cytokines (IL-1b, IL-6, IL-12, IL-18, and tumor necrosis factor [TNF]-a) by KCs. Whereas KCs, liver sinusoidal endothelial cells, hepatocytes, and stellate cells can act as APCs for intrahepatic T cells, most T cell responses are activated in lymph nodes by APCs migrating from the liver after antigen exposure. Effector T cells generated in lymph nodes migrate transendothelially into portal tracts in response to chemokines, producing portal and periportal inflammatory infiltrates that mediate AIH. Interplay of Innate and Adaptive Immunity in Pathogenesis The immunopathogenesis AIH (Fig. 2) involves initiation by environmental triggers in persons with immunogenetic predisposition, loss of immunological tolerance to liver autoantigens due to a permissive immune repertoire with defective natural T regulatory cells (Tregs), production of an unregulated immune attack by T cells against hepatic autoantigens, and B cell production of nonorgan, non-speciesspecific autoantibodies and elevated levels of IgG. 2,3 Adaptive immunity involves activation of antigen-specific T cells and B cells (Fig. 3). APCs process antigens into peptides that fit the antigen-binding grooves of specific HLA class I and class II molecules and present these HLA-antigen complexes to T cell receptors (TCRs). TCRs of CD4 T cells respond to class II HLA-antigen complexes, whereas TCRs of CD8 T cells respond to class I HLA-antigen complexes. APCs also express costimulatory molecules needed for Abbreviations: AIH, autoimmune hepatitis; ANA, antinuclear antibodies; APC, antigen-presenting cell; ASMA, anti-smooth muscle antibodies; CYP, cytochrome P450; CYP2D6, cytochrome P450 2D6; DAMP, danger-associated molecular pattern; IgG, immunoglobulin G; IL, interleukin; itreg, inducible T regulatory cell; KC, Kupffer cell; PAMP, pathogen-associated molecular pattern; TCR, T cell receptor; Th, T helper; TNF, tumor necrosis factor; Treg, T regulatory cell; Tr1, T regulatory 1 cell; UGT, uridine diphosphate glucuronosyltransferase. From the Departments of Medicine and Surgery, Baylor College of Medicine, Houston, TX. Potential conflict of interest: Nothing to report. View this article online at wileyonlinelibrary.com VC 2014 by the American Association for the Study of Liver Diseases doi: /cld Clinical Liver Disease, Vol 3, No 2, February 2014 An Official Learning Resource of AASLD
2 Figure 1 Interactions of genetics, permissive immune repertoire, immunoregulation, and environment involved in the pathogenesis of AIH. Abbreviations: SNPs, single nucleotide polymorphisms. Figure 2 Hypothetical sequence of events in the immunopathogenesis of AIH. functional differentiation of CD4 T cell subsets and CD8 cytotoxicity. B cells produce antigen-specific antibodies (including autoantibodies) when stimulated by CD4 T helper 2 (Th2) and Th1 and act as APCs. Tregs maintain self-tolerance and control the extent and duration of immune responses. 4 Natural CD4 Tregs that recognize all autoantigens are generated in the thymus. Within lymphoid organs, natural Tregs prevent autoimmunity by 25 Clinical Liver Disease, Vol 3, No 2, February 2014 An Official Learning Resource of AASLD
3 Figure 3 Adaptive immune response of CD4 and CD8 T cells in AIH. The intense immunopathology of AIH suggests that active innate immune responses skew the adaptive response toward a CD4 Th1 profile, generating cytokines that promote proliferation and function of CD8 cytotoxic T cells. Optimal activation of both CD4 and CD8 T cells requires that APCs that express costimulatory molecules (e.g., CD80/86) engage T cell costimulatory receptors (e.g., CD28). The signature cytokines of CD4 Th1 cells inhibit the proliferation and cytokine secretion of CD4 Th2 cells. Similarly, the signature cytokines of CD4 Th2 cells inhibit proliferation and cytokine secretion by CD4 Th1 cells. Thus, a balance is established between Th1 and Th2 effects. CD4 Th0 activation also generates inducible Tregs and both Tr1 and Th3 regulatory cells. CD4 Th17 cells intensify local inflammation and tissue injury. CD4 Th1 and Th2 cytokines stimulate B cell production of antibodies, resulting in sustained elevation of IgG and autoantibodies. In AIH, autoantigen-specific itregs and Tr1 and Th3 cells may fail to terminate the autoimmune response, perpetrating progressive immunopathology. Chronic inflammation also results in non--antigen-specific activation and recruitment of macrophages, neutrophils, eosinophils, and natural killer cells. Abbreviations: IFNg, interferon g; NKT, natural killer T cells, IL, interleukin; TNF, tumor necrosis factor; MAC, macrophage; PAMPs, pathogen-associated molecular patterns; Th, Thelper. TABLE 1 HLA DRB1 Alleles Associated with AIH Susceptibility and Resistance Alleles Susceptibility Alleles DRB1*0301 DRB1*0401 DRB1*0404 DRB1*0405 DRB1*1301 Resistance Alleles DRB1*1501 DRB1*1302 Geographic Distribution North America, Europe North America, Europe Japan Japan South America North and South America, Europe, Japan South America inhibiting APCs that express HLA-autoantigen complexes. Regulation of adaptive immune responses is mediated by antigen-specific CD4-inducible T regulatory cells (itregs), IL- 10-secreting T regulatory 1 cells (Tr1), and CD4 transforming growth factor b-secreting Th3 cells (Fig. 3). 4 Autoantigens remain undefined in type 1 AIH, but oligoclonality of TCRs suggest they are limited in number. 5 In type 2 AIH, both T and B cell autoantigens are present in cytochrome P450 2D6 (CYP2D6). 3 ANA and ASMA have no apparent pathogenic role in type 1 AIH; however, identification of novel type 1 hepatic autoantigens may lead to detection of autoantibodies reacting with their epitopes. In type 2 AIH, anti-lkm1 reacts with B cell-specific epitopes in CYP2D6, but their role in pathogenesis in unclear. Genetic Factors Both immune and nonimmune genetic factors are involved in AIH pathogenesis. 2,3 HLA class II DR alleles confer susceptibility or resistance to AIH (Table 1), indicating the importance of their role in presenting AIH-specific peptide antigens to CD4 T cells (Fig. 3). 6 HLA class III genes also encode complement factors 2 and 4, TNFa/b and heat shock proteins. Single nucleotide polymorphisms in TNFa position 2308 lead to unregulated expression of TNFa. Single nucleotide polymorphisms in non-hla genes, 26 Clinical Liver Disease, Vol 3, No 2, February 2014 An Official Learning Resource of AASLD
4 including CTLA-4, Fas, vitamin D receptor and autoimmune regulator 1 transcription factor, also have been implicated in AIH pathogenesis and/or progression. Permissive Immune Repertoire Onset of AIH requires a permissive autoreactive immune repertoire and failure of natural Tregs to maintain tolerance to autoantigens. 2 Once AIH is initiated, the duration, extent, and distribution of inflammation within the liver is dictated by the balance between T cell effector and deficient autoantigen-specific itreg, Tr1, and Th3 suppressive functions. 7 Environmental Factors Viral infections and xenobiotics can trigger AIH in immunologically susceptible persons. 2 Hepatitis A virus infection is strongly associated with AIH in Argentine children and in TABLE 2 Reported Defects in Immunoregulation of AIH Suppressor cell dysfunction Abnormal antigen-specific T cell suppression Decreased quantities and functions of CD4-CD25 Tregs Dysfunctional Treg control of CD4 and CD8 T cells Abnormal Treg stimulation of regulatory cytokines Abnormal Treg control of monocytes Brazilians. The susceptibility allele for AIH is HLA class II DRB1*1301, which is also associated with protracted hepatitis A virus infections. Immune responses to drug or xenobiotic metabolites bound to self-proteins of cytochrome P450 (CYP) isoforms or uridine diphosphate glucuronosyltransferases (UGTs) may result in autoimmune reactions against CYPs or UGTs. Immunoregulation Deficiencies in the numbers and functions of itregs, CD4 Tr1, or CD4 Th3 cells may play a key role in AIH pathogenesis (Table 2); however, studies in patients with wellestablished AIH are difficult to interpret. 3,7 Immunosuppression can partially restore deficiencies. Therapeutic Implications The sequential steps involved in a chronic adaptive immune response provide the clinician with multiple therapeutic options to achieve remission in AIH using either conventional or alternative immunosuppressive agents (Fig. 4). 8 The ability to generate autologous CYP2D6 antigen-specific Tregs from CD4 T cells harvested from peripheral blood sets the stage for infusions of type 2 AIH-specific itregs to control disease. 9 Characterization of type 1 AIH autoantigens is a prerequisite for a similar therapeutic approach. Complete understanding of Figure 4 Therapeutic targets for control of the multistep adaptive immune response in autoimmune hepatitis. Corticosteroids and azathioprine are first-line therapies to induce remission. Alternative therapies may be required for patients who fail to achieve remission using corticosteroids and azathioprine or are intolerant of these agents. Abbreviations: IVIG, intravenous immunoglobulin; APC, antigen-presenting cell. 27 Clinical Liver Disease, Vol 3, No 2, February 2014 An Official Learning Resource of AASLD
5 the immunopathogenesis of AIH may lead to additional novel strategies for prevention and treatment. 10 n CORRESPONDENCE John M. Vierling, M.D., 6620 Main Street, Suite 1425, Houston, TX vierling@bcm.edu. REFERENCES 1. Manns MP, Czaja AJ, Gorham JD, Krawitt EL, Mieli-Vergani G, Vergani D, et al. Diagnosis and management of autoimmune hepatitis. Hepatology 2010; 51: Vierling JM. The pathogenesis of autoimmune hepatitis. In: Hirschfield GM, Heathcote EJ, eds. Autoimmune Hepatitis: A Guide for Practicing Clinicians. New York: Humana Press; 2012: Liberal R, Grant CR, Mieli-Vergani G, Vergani D. Autoimmune hepatitis: a comprehensive review. J Autoimmun 2013;41: Vierling JM. Autoimmune hepatitis and antigen-specific T regulatory cells: when can we send in the regulators? Hepatology 2011;53: Ichiki Y, Aoki CA, Bowlus CL, Shimoda S, Ishibashi H, Gershwin ME. T cell immunity in autoimmune hepatitis. Autoimmun Rev 2005;4: Oliveira LC, Porta G, Marin ML, Bittencourt PL, Kalil J, Goldberg AC. Autoimmune hepatitis, HLA and extended haplotypes. Autoimmun Rev 2011;10: Ferri S, Lalanne C, Masi C, Muratori L. Regulatory T cell defects in adult autoimmune hepatitis. J Hepatol 2012;57: Czaja AJ. Autoimmune hepatitis: focusing on treatments other than steroids. Can J Gastroenterol 2012;26: Muratori L, Longhi MS. The interplay between regulatory and effector T cells in autoimmune hepatitis: implications for innovative treatment strategies. J Autoimmun 2013;46: Czaja AJ. Emerging opportunities for site-specific molecular and cellular interventions in autoimmune hepatitis. Dig Dis Sci 2010;55: Clinical Liver Disease, Vol 3, No 2, February 2014 An Official Learning Resource of AASLD
Autoimmune Hepatitis
Gideon M. Hirschfield Editors E. Jenny Heathcote Autoimmune Hepatitis A Guide for Practicing Clinicians Editors Gideon M. Hirschfield, MB, BChir, MRCP, PhD Department of Medicine Toronto Western Hospital,
More information1. Overview of Adaptive Immunity
Chapter 17A: Adaptive Immunity Part I 1. Overview of Adaptive Immunity 2. T and B Cell Production 3. Antigens & Antigen Presentation 4. Helper T cells 1. Overview of Adaptive Immunity The Nature of Adaptive
More informationImmunology for the Rheumatologist
Immunology for the Rheumatologist Rheumatologists frequently deal with the immune system gone awry, rarely studying normal immunology. This program is an overview and discussion of the function of the
More informationSPECIFIC AIMS. II year (1st semester)
II year (1st semester) Scientific Field IMMUNOLOGY AND IMMUNOPATHOLOGY TUTOR ECTS MALISAN F. COORDINATOR MED/04 Immunology and Immunopathology Malisan Florence 5 MED/04 Immunology and Immunopathology Testi
More informationACTIVATION AND EFFECTOR FUNCTIONS OF CELL-MEDIATED IMMUNITY AND NK CELLS. Choompone Sakonwasun, MD (Hons), FRCPT
ACTIVATION AND EFFECTOR FUNCTIONS OF CELL-MEDIATED IMMUNITY AND NK CELLS Choompone Sakonwasun, MD (Hons), FRCPT Types of Adaptive Immunity Types of T Cell-mediated Immune Reactions CTLs = cytotoxic T lymphocytes
More informationDeterminants of Immunogenicity and Tolerance. Abul K. Abbas, MD Department of Pathology University of California San Francisco
Determinants of Immunogenicity and Tolerance Abul K. Abbas, MD Department of Pathology University of California San Francisco EIP Symposium Feb 2016 Why do some people respond to therapeutic proteins?
More informationTolerance 2. Regulatory T cells; why tolerance fails. Abul K. Abbas UCSF. FOCiS
1 Tolerance 2. Regulatory T cells; why tolerance fails Abul K. Abbas UCSF FOCiS 2 Lecture outline Regulatory T cells: functions and clinical relevance Pathogenesis of autoimmunity: why selftolerance fails
More informationImmunological Tolerance
Immunological Tolerance Introduction Definition: Unresponsiveness to an antigen that is induced by exposure to that antigen Tolerogen = tolerogenic antigen = antigen that induces tolerance Important for
More informationEffector T Cells and
1 Effector T Cells and Cytokines Andrew Lichtman, MD PhD Brigham and Women's Hospital Harvard Medical School 2 Lecture outline Cytokines Subsets of CD4+ T cells: definitions, functions, development New
More informationAdvances in Cancer Immunotherapy
Advances in Cancer Immunotherapy Immunology 101 for the Non-Immunologist Arnold H. Zea, PhD azea@lsuhsc.edu Disclosures No relevant financial relationships to disclose This presentation does not contain
More informationAutoimmunity. Autoimmunity arises because of defects in central or peripheral tolerance of lymphocytes to selfantigens
Autoimmunity Autoimmunity arises because of defects in central or peripheral tolerance of lymphocytes to selfantigens Autoimmune disease can be caused to primary defects in B cells, T cells and possibly
More informationCELL BIOLOGY - CLUTCH CH THE IMMUNE SYSTEM.
!! www.clutchprep.com CONCEPT: OVERVIEW OF HOST DEFENSES The human body contains three lines of against infectious agents (pathogens) 1. Mechanical and chemical boundaries (part of the innate immune system)
More informationCLINICAL GASTROENTEROLOGY
CLINICAL GASTROENTEROLOGY Series Editor George Y. Wu University of Connecticut Health Center, Farmington, CT, USA For further volumes: http://www.springer.com/series/7672 kkkkkkkkk Gideon M. Hirschfield
More informationImmunology Basics Relevant to Cancer Immunotherapy: T Cell Activation, Costimulation, and Effector T Cells
Immunology Basics Relevant to Cancer Immunotherapy: T Cell Activation, Costimulation, and Effector T Cells Andrew H. Lichtman, M.D. Ph.D. Department of Pathology Brigham and Women s Hospital and Harvard
More informationEffector mechanisms of cell-mediated immunity: Properties of effector, memory and regulatory T cells
ICI Basic Immunology course Effector mechanisms of cell-mediated immunity: Properties of effector, memory and regulatory T cells Abul K. Abbas, MD UCSF Stages in the development of T cell responses: induction
More informationAntigen Presentation and T Lymphocyte Activation. Abul K. Abbas UCSF. FOCiS
1 Antigen Presentation and T Lymphocyte Activation Abul K. Abbas UCSF FOCiS 2 Lecture outline Dendritic cells and antigen presentation The role of the MHC T cell activation Costimulation, the B7:CD28 family
More informationMedical Virology Immunology. Dr. Sameer Naji, MB, BCh, PhD (UK) Head of Basic Medical Sciences Dept. Faculty of Medicine The Hashemite University
Medical Virology Immunology Dr. Sameer Naji, MB, BCh, PhD (UK) Head of Basic Medical Sciences Dept. Faculty of Medicine The Hashemite University Human blood cells Phases of immune responses Microbe Naïve
More informationT-cell activation T cells migrate to secondary lymphoid tissues where they interact with antigen, antigen-presenting cells, and other lymphocytes:
Interactions between innate immunity & adaptive immunity What happens to T cells after they leave the thymus? Naïve T cells exit the thymus and enter the bloodstream. If they remain in the bloodstream,
More informationT-cell activation T cells migrate to secondary lymphoid tissues where they interact with antigen, antigen-presenting cells, and other lymphocytes:
Interactions between innate immunity & adaptive immunity What happens to T cells after they leave the thymus? Naïve T cells exit the thymus and enter the bloodstream. If they remain in the bloodstream,
More informationAdvances in the Diagnosis, Pathogenesis, and Management of Autoimmune Hepatitis
2010;139:58 72 John P. Lynch and David C. Metz, Section Editors Advances in the Diagnosis, Pathogenesis, and Management of Autoimmune Hepatitis ALBERT J. CZAJA* and MICHAEL P. MANNS *Division of Gastroenterology
More informationTCR, MHC and coreceptors
Cooperation In Immune Responses Antigen processing how peptides get into MHC Antigen processing involves the intracellular proteolytic generation of MHC binding proteins Protein antigens may be processed
More informationLecture outline. Immunological tolerance and immune regulation. Central and peripheral tolerance. Inhibitory receptors of T cells. Regulatory T cells
1 Immunological tolerance and immune regulation Abul K. Abbas UCSF 2 Lecture outline Central and peripheral tolerance Inhibitory receptors of T cells Regulatory T cells 1 The immunological equilibrium:
More informationThe Major Histocompatibility Complex (MHC)
The Major Histocompatibility Complex (MHC) An introduction to adaptive immune system before we discuss MHC B cells The main cells of adaptive immune system are: -B cells -T cells B cells: Recognize antigens
More informationImmunology lecture: 14. Cytokines: Main source: Fibroblast, but actually it can be produced by other types of cells
Immunology lecture: 14 Cytokines: 1)Interferons"IFN" : 2 types Type 1 : IFN-Alpha : Main source: Macrophages IFN-Beta: Main source: Fibroblast, but actually it can be produced by other types of cells **There
More informationLYMPHOCYTES & IMMUNOGLOBULINS. Dr Mere Kende, Lecturer SMHS
LYMPHOCYTES & IMMUNOGLOBULINS Dr Mere Kende, Lecturer SMHS Immunity Immune- protection against dangers of non-self/invader eg organism 3 components of immune system 1 st line: skin/mucosa/cilia/hair/saliva/fatty
More informationAdaptive Immunity. Jeffrey K. Actor, Ph.D. MSB 2.214,
Adaptive Immunity Jeffrey K. Actor, Ph.D. MSB 2.214, 500-5344 Lecture Objectives: Understand role of various molecules including cytokines, chemokines, costimulatory and adhesion molecules in the development
More informationOverview of the Lymphoid System
Overview of the Lymphoid System The Lymphoid System Protects us against disease Lymphoid system cells respond to Environmental pathogens Toxins Abnormal body cells, such as cancers Overview of the Lymphoid
More informationCellular Pathology of immunological disorders
Cellular Pathology of immunological disorders SCBM344 Cellular and Molecular Pathology Witchuda Payuhakrit, Ph.D (Pathobiology) witchuda.pay@mahidol.ac.th Objectives Describe the etiology of immunological
More informationLecture 9: T-cell Mediated Immunity
Lecture 9: T-cell Mediated Immunity Questions to Consider How do T cells know where to go? Questions to Consider How do T cells know where to go? How does antigen get targeted to a T cell expressing the
More informationTolerance 2. Regulatory T cells; why tolerance fails. FOCiS. Lecture outline. Regulatory T cells. Regulatory T cells: functions and clinical relevance
1 Tolerance 2. Regulatory T cells; why tolerance fails Abul K. Abbas UCSF FOCiS 2 Lecture outline Regulatory T cells: functions and clinical relevance Pathogenesis of autoimmunity: why selftolerance fails
More informationImmunology Lecture 4. Clinical Relevance of the Immune System
Immunology Lecture 4 The Well Patient: How innate and adaptive immune responses maintain health - 13, pg 169-181, 191-195. Immune Deficiency - 15 Autoimmunity - 16 Transplantation - 17, pg 260-270 Tumor
More informationImmune system. Aims. Immune system. Lymphatic organs. Inflammation. Natural immune system. Adaptive immune system
Aims Immune system Lymphatic organs Inflammation Natural immune system Adaptive immune system Major histocompatibility complex (MHC) Disorders of the immune system 1 2 Immune system Lymphoid organs Immune
More informationChapter 24 The Immune System
Chapter 24 The Immune System The Immune System Layered defense system The skin and chemical barriers The innate and adaptive immune systems Immunity The body s ability to recognize and destroy specific
More informationAttribution: University of Michigan Medical School, Department of Microbiology and Immunology
Attribution: University of Michigan Medical School, Department of Microbiology and Immunology License: Unless otherwise noted, this material is made available under the terms of the Creative Commons Attribution
More informationGeneral Overview of Immunology. Kimberly S. Schluns, Ph.D. Associate Professor Department of Immunology UT MD Anderson Cancer Center
General Overview of Immunology Kimberly S. Schluns, Ph.D. Associate Professor Department of Immunology UT MD Anderson Cancer Center Objectives Describe differences between innate and adaptive immune responses
More informationAdaptive immune responses: T cell-mediated immunity
MICR2209 Adaptive immune responses: T cell-mediated immunity Dr Allison Imrie allison.imrie@uwa.edu.au 1 Synopsis: In this lecture we will discuss the T-cell mediated immune response, how it is activated,
More informationTopic (Final-03): Immunologic Tolerance and Autoimmunity-Part II
Topic (Final-03): Immunologic Tolerance and Autoimmunity-Part II MECHANISMS OF AUTOIMMUNITY The possibility that an individual s immune system may react against autologous antigens and cause tissue injury
More informationLESSON 2: THE ADAPTIVE IMMUNITY
Introduction to immunology. LESSON 2: THE ADAPTIVE IMMUNITY Today we will get to know: The adaptive immunity T- and B-cells Antigens and their recognition How T-cells work 1 The adaptive immunity Unlike
More informationchapter 17: specific/adaptable defenses of the host: the immune response
chapter 17: specific/adaptable defenses of the host: the immune response defense against infection & illness body defenses innate/ non-specific adaptable/ specific epithelium, fever, inflammation, complement,
More informationAUTOIMMUNITY CLINICAL CORRELATES
AUTOIMMUNITY CLINICAL CORRELATES Pamela E. Prete, MD, FACP, FACR Section Chief, Rheumatology VA Healthcare System, Long Beach, CA Professor of Medicine, Emeritus University of California, Irvine Colonel
More informationAUTOIMMUNITY TOLERANCE TO SELF
AUTOIMMUNITY CLINICAL CORRELATES Pamela E. Prete, MD, FACP, FACR Section Chief, Rheumatology VA Healthcare System, Long Beach, CA Professor of Medicine, Emeritus University of California, Irvine Colonel
More informationAlessandra Franco MD PhD UCSD School of Medicine Department of Pediatrics Division of Allergy Immunology and Rheumatology
Immunodominant peptides derived from the heavy constant region of IgG1 stimulate natural regulatory T cells: identification of pan- HLA binders for clinical translation Alessandra Franco MD PhD UCSD School
More informationThe Immune System. These are classified as the Innate and Adaptive Immune Responses. Innate Immunity
The Immune System Biological mechanisms that defend an organism must be 1. triggered by a stimulus upon injury or pathogen attack 2. able to counteract the injury or invasion 3. able to recognise foreign
More informationPrinciples of Adaptive Immunity
Principles of Adaptive Immunity Chapter 3 Parham Hans de Haard 17 th of May 2010 Agenda Recognition molecules of adaptive immune system Features adaptive immune system Immunoglobulins and T-cell receptors
More informationWhat is Autoimmunity?
Autoimmunity What is Autoimmunity? Robert Beatty MCB150 Autoimmunity is an immune response to self antigens that results in disease. The immune response to self is a result of a breakdown in immune tolerance.
More informationWhat is Autoimmunity?
Autoimmunity What is Autoimmunity? Robert Beatty MCB150 Autoimmunity is an immune response to self antigens that results in disease. The immune response to self is a result of a breakdown in immune tolerance.
More informationAllergy and Immunology Review Corner: Chapter 19 of Immunology IV: Clinical Applications in Health and Disease, by Joseph A. Bellanti, MD.
Allergy and Immunology Review Corner: Chapter 19 of Immunology IV: Clinical Applications in Health and Disease, by Joseph A. Bellanti, MD. Chapter 19: Tolerance, Autoimmunity, and Autoinflammation Prepared
More information5/1/13. The proportion of thymus that produces T cells decreases with age. The cellular organization of the thymus
T cell precursors migrate from the bone marrow via the blood to the thymus to mature 1 2 The cellular organization of the thymus The proportion of thymus that produces T cells decreases with age 3 4 1
More informationAutoimmune Diseases. Betsy Kirchner CNP The Cleveland Clinic
Autoimmune Diseases Betsy Kirchner CNP The Cleveland Clinic Disclosures (financial) No relevant disclosures Learning Objectives Explain the pathophysiology of autoimmune disease Discuss safe administration
More information11/25/2017. THE IMMUNE SYSTEM Chapter 43 IMMUNITY INNATE IMMUNITY EXAMPLE IN INSECTS BARRIER DEFENSES INNATE IMMUNITY OF VERTEBRATES
THE IMMUNE SYSTEM Chapter 43 IMMUNITY INNATE IMMUNITY EXAMPLE IN INSECTS Exoskeleton made of chitin forms the first barrier to pathogens Digestive system is protected by a chitin-based barrier and lysozyme,
More informationWHY IS THIS IMPORTANT?
CHAPTER 16 THE ADAPTIVE IMMUNE RESPONSE WHY IS THIS IMPORTANT? The adaptive immune system protects us from many infections The adaptive immune system has memory so we are not infected by the same pathogen
More informationImmune response to infection
Immune response to infection Dr. Sandra Nitsche (Sandra.Nitsche@rub.de ) 20.06.2018 1 Course of acute infection Typical acute infection that is cleared by an adaptive immune reaction 1. invasion of pathogen
More informationThe Adaptive Immune Responses
The Adaptive Immune Responses The two arms of the immune responses are; 1) the cell mediated, and 2) the humoral responses. In this chapter we will discuss the two responses in detail and we will start
More informationCASE 1 Plasma Cell Infiltrates: Significance in post liver transplantation and in chronic liver disease
CASE 1 Plasma Cell Infiltrates: Significance in post liver transplantation and in chronic liver disease Maria Isabel Fiel, M.D. The Mount Sinai Medical Center New York, New York Case A 57 yo man, 7 months
More informationAutoimmune Hepatitis in Clinical Practice
1 Autoimmune Hepatitis in Clinical Practice Atif Zaman, MD MPH Professor of Medicine Senior Associate Dean for Clinical and Faculty Affairs School of Medicine Oregon Health & Science University Disclosure
More informationAdaptive (acquired) immunity. Professor Peter Delves University College London
Adaptive (acquired) immunity Professor Peter Delves University College London p.delves@ucl.ac.uk Haematopoiesis Haematopoiesis Lymphocytes = adaptive response Recognition of pathogens by adaptive cells,
More informationACTIVATION OF T LYMPHOCYTES AND CELL MEDIATED IMMUNITY
ACTIVATION OF T LYMPHOCYTES AND CELL MEDIATED IMMUNITY The recognition of specific antigen by naïve T cell induces its own activation and effector phases. T helper cells recognize peptide antigens through
More informationChapter 23 Immunity Exam Study Questions
Chapter 23 Immunity Exam Study Questions 1. Define 1) Immunity 2) Neutrophils 3) Macrophage 4) Epitopes 5) Interferon 6) Complement system 7) Histamine 8) Mast cells 9) Antigen 10) Antigens receptors 11)
More informationIntroduction to Immune System
Introduction to Immune System Learning outcome You will be able to understand, at a fundamental level, the STRUCTURES and FUNCTIONS of cell surface and soluble molecules involved in recognition of foreign
More informationall of the above the ability to impart long term memory adaptive immunity all of the above bone marrow none of the above
1. (3 points) Immediately after a pathogen enters the body, it faces the cells and soluble proteins of the innate immune system. Which of the following are characteristics of innate immunity? a. inflammation
More informationDarwinian selection and Newtonian physics wrapped up in systems biology
Darwinian selection and Newtonian physics wrapped up in systems biology Concept published in 1957* by Macfarland Burnet (1960 Nobel Laureate for the theory of induced immune tolerance, leading to solid
More informationImmunity. Acquired immunity differs from innate immunity in specificity & memory from 1 st exposure
Immunity (1) Non specific (innate) immunity (2) Specific (acquired) immunity Characters: (1) Non specific: does not need special recognition of the foreign cell. (2) Innate: does not need previous exposure.
More informationChapter 1. Full file at
Chapter 1 1. Which is the best definition of immunity? Answer: B A. The state of having been exposed to a pathogen repeatedly B. The state of being resistant to reinfection with a pathogen C. When an individual
More informationAutoimmune hepatitis
Autoimmune hepatitis: Autoimmune hepatitis a spectrum within a spectrum Alastair Burt Professor of Pathology and Dean of Clinical Medicine Newcastle University Spectrum of autoimmune liver disease Autoimmune
More informationThe development of T cells in the thymus
T cells rearrange their receptors in the thymus whereas B cells do so in the bone marrow. The development of T cells in the thymus The lobular/cellular organization of the thymus Immature cells are called
More informationAutoimmune Hepatitis: Histopathology
REVIEW Autoimmune Hepatitis: Histopathology Stephen A. Geller M.D.*, Autoimmune hepatitis (AIH), a chronic hepatic necroinflammatory disorder, occurs mostly in women. AIH is characterized by prominent
More informationChapter 21: Innate and Adaptive Body Defenses
Chapter 21: Innate and Adaptive Body Defenses I. 2 main types of body defenses A. Innate (nonspecific) defense: not to a specific microorganism or substance B. Adaptive (specific) defense: immunity to
More informationThey determine if there will be an immune response. Determine functions associated with immune response, but not specific to Ag.
Appendices A They determine if there will be an immune response. Antigen receptor genes in T cells (TCR) and B cell (Ig) Determine functions associated with immune response, but not specific to Ag. MHC
More informationCytokines modulate the functional activities of individual cells and tissues both under normal and pathologic conditions Interleukins,
Cytokines http://highered.mcgraw-hill.com/sites/0072507470/student_view0/chapter22/animation the_immune_response.html Cytokines modulate the functional activities of individual cells and tissues both under
More informationTolerance, autoimmunity and the pathogenesis of immunemediated inflammatory diseases. Abul K. Abbas UCSF
Tolerance, autoimmunity and the pathogenesis of immunemediated inflammatory diseases Abul K. Abbas UCSF Balancing lymphocyte activation and control Activation Effector T cells Tolerance Regulatory T cells
More informationAdaptive Immunity: Specific Defenses of the Host
17 Adaptive Immunity: Specific Defenses of the Host SLOs Differentiate between innate and adaptive immunity, and humoral and cellular immunity. Define antigen, epitope, and hapten. Explain the function
More informationThere are 2 major lines of defense: Non-specific (Innate Immunity) and. Specific. (Adaptive Immunity) Photo of macrophage cell
There are 2 major lines of defense: Non-specific (Innate Immunity) and Specific (Adaptive Immunity) Photo of macrophage cell Development of the Immune System ery pl neu mφ nk CD8 + CTL CD4 + thy TH1 mye
More informationAn autoimmune perspective on neuromuscular diseases
An autoimmune perspective on neuromuscular diseases Colin Chalk MD,CM FRCPC Montreal General Hospital McGill University Schlomchik 2001 The proportion of neuromuscular patients who have an autoimmune cause
More informationScott Abrams, Ph.D. Professor of Oncology, x4375 Kuby Immunology SEVENTH EDITION
Scott Abrams, Ph.D. Professor of Oncology, x4375 scott.abrams@roswellpark.org Kuby Immunology SEVENTH EDITION CHAPTER 13 Effector Responses: Cell- and Antibody-Mediated Immunity Copyright 2013 by W. H.
More informationFluid movement in capillaries. Not all fluid is reclaimed at the venous end of the capillaries; that is the job of the lymphatic system
Capillary exchange Fluid movement in capillaries Not all fluid is reclaimed at the venous end of the capillaries; that is the job of the lymphatic system Lymphatic vessels Lymphatic capillaries permeate
More informationI. Defense Mechanisms Chapter 15
10/24/11 I. Defense Mechanisms Chapter 15 Immune System Lecture PowerPoint Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Defense Mechanisms Protect against
More informationChapter 13 Lymphatic and Immune Systems
The Chapter 13 Lymphatic and Immune Systems 1 The Lymphatic Vessels Lymphoid Organs Three functions contribute to homeostasis 1. Return excess tissue fluid to the bloodstream 2. Help defend the body against
More informationThe Immune System. A macrophage. ! Functions of the Immune System. ! Types of Immune Responses. ! Organization of the Immune System
The Immune System! Functions of the Immune System! Types of Immune Responses! Organization of the Immune System! Innate Defense Mechanisms! Acquired Defense Mechanisms! Applied Immunology A macrophage
More informationI. Lines of Defense Pathogen: Table 1: Types of Immune Mechanisms. Table 2: Innate Immunity: First Lines of Defense
I. Lines of Defense Pathogen: Table 1: Types of Immune Mechanisms Table 2: Innate Immunity: First Lines of Defense Innate Immunity involves nonspecific physical & chemical barriers that are adapted for
More informationMicr-6005, Current Concepts of Immunology (Rutgers course number: 16:681:543) Spring 2009 Semester
Micr-6005, Current Concepts of Immunology (Rutgers course number: 16:681:543) (3 Credits) Spring 2009 Semester Course Director: (732-235-4501, ) Please note that this course is offered once every 2 years.
More information1. The scavenger receptor, CD36, functions as a coreceptor for which TLR? a. TLR ½ b. TLR 3 c. TLR 4 d. TLR 2/6
Allergy and Immunology Review Corner: Cellular and Molecular Immunology, 8th Edition By Abul K. Abbas, MBBS, Andrew H. H. Lichtman, MD, PhD and Shiv Pillai, MBBS, PhD. Chapter 4 (pages 62-74): Innate Immunity
More informationCentral tolerance. Mechanisms of Immune Tolerance. Regulation of the T cell response
Immunoregulation: A balance between activation and suppression that achieves an efficient immune response without damaging the host. Mechanisms of Immune Tolerance ACTIVATION (immunity) SUPPRESSION (tolerance)
More informationMechanisms of Immune Tolerance
Immunoregulation: A balance between activation and suppression that achieves an efficient immune response without damaging the host. ACTIVATION (immunity) SUPPRESSION (tolerance) Autoimmunity Immunodeficiency
More informationThe Immune System: Innate and Adaptive Body Defenses Outline PART 1: INNATE DEFENSES 21.1 Surface barriers act as the first line of defense to keep
The Immune System: Innate and Adaptive Body Defenses Outline PART 1: INNATE DEFENSES 21.1 Surface barriers act as the first line of defense to keep invaders out of the body (pp. 772 773; Fig. 21.1; Table
More informationAutoimmune Hepatitis: Recent Advances in the Pathogenesis and New Diagnostic Guidelines in Japan
REVIEW ARTICLE Autoimmune Hepatitis: Recent Advances in the Pathogenesis and New Diagnostic Guidelines in Japan Hiromasa Ohira, Kazumichi Abe, Atsushi Takahashi and Hiroshi Watanabe Abstract Autoimmune
More informationT Lymphocyte Activation and Costimulation. FOCiS. Lecture outline
1 T Lymphocyte Activation and Costimulation Abul K. Abbas, MD UCSF FOCiS 2 Lecture outline T cell activation Costimulation, the B7:CD28 family Inhibitory receptors of T cells Targeting costimulators for
More informationAnatomy. Lymph: Tissue fluid that enters a lymphatic capillary (clear fluid that surrounds new piercings!)
Lymphatic System Anatomy Lymphatic vessels: meet up in capillaries of of tissues to collect extra water, and have an end point of meeting up with lymphatic ducts that empty fluid into large veins in the
More informationImmune Surveillance. Immune Surveillance. Immune Surveillance. Neutrophil granulocytes Macrophages. M-cells
he immune system is everywhere Some organs have developed strategies towards the immune system to keep it out or to put it under control Immune privileged organs: Brain Eye estis hyroid gland Humoral immunity
More informationLymphatic System. Where s your immunity idol?
Lymphatic System Where s your immunity idol? Functions of the Lymphatic System Fluid Balance Drains excess fluid from tissues Lymph contains solutes from plasma Fat Absorption Lymphatic system absorbs
More informationIMMUNOTHERAPY FOR CANCER A NEW HORIZON. Ekaterini Boleti MD, PhD, FRCP Consultant in Medical Oncology Royal Free London NHS Foundation Trust
IMMUNOTHERAPY FOR CANCER A NEW HORIZON Ekaterini Boleti MD, PhD, FRCP Consultant in Medical Oncology Royal Free London NHS Foundation Trust ASCO Names Advance of the Year: Cancer Immunotherapy No recent
More informationDNA vaccine, peripheral T-cell tolerance modulation 185
Subject Index Airway hyperresponsiveness (AHR) animal models 41 43 asthma inhibition 45 overview 41 mast cell modulation of T-cells 62 64 respiratory tolerance 40, 41 Tregs inhibition role 44 respiratory
More informationGenetics. Environment. You Are Only 10% Human. Pathogenesis of IBD. Advances in the Pathogenesis of IBD: Genetics Leads to Function IBD
Advances in the Pathogenesis of IBD: Genetics Leads to Function Pathogenesis of IBD Environmental Factors Microbes Scott Plevy, MD Associate Professor of Medicine, Microbiology & Immunology UNC School
More informationDefensive mechanisms include :
Acquired Immunity Defensive mechanisms include : 1) Innate immunity (Natural or Non specific) 2) Acquired immunity (Adaptive or Specific) Cell-mediated immunity Humoral immunity Two mechanisms 1) Humoral
More informationImmune System. Presented by Kazzandra Anton, Rhea Chung, Lea Sado, and Raymond Tanaka
Immune System Presented by Kazzandra Anton, Rhea Chung, Lea Sado, and Raymond Tanaka Content Standards 35.1 In innate immunity, recognition and response rely on traits common to groups of pathogens 35.2
More informationWhite Blood Cells (WBCs)
YOUR ACTIVE IMMUNE DEFENSES 1 ADAPTIVE IMMUNE RESPONSE 2! Innate Immunity - invariant (generalized) - early, limited specificity - the first line of defense 1. Barriers - skin, tears 2. Phagocytes - neutrophils,
More informationThe Adaptive Immune Response. B-cells
The Adaptive Immune Response B-cells The innate immune system provides immediate protection. The adaptive response takes time to develop and is antigen specific. Activation of B and T lymphocytes Naive
More informationMucosal Immune System
Exam Format 100 points - 60 pts mandatory; 40 points where 4, 10 point questions will be chosen Some open-ended questions, some short answer. Kuby question Cytokines Terminology How do cytokines achieve
More informationRequirements in the Development of an Autoimmune Disease Amino Acids in the Shared Epitope
+ T cell MHC/self-peptide MHC/Vβ Induction of + T H 1 mediated autoimmunity: A paradigm for the pathogenesis of rheumatoid arthritis, multiple sclerosis and type I diabetes APC Activated autoreactive +
More informationAll animals have innate immunity, a defense active immediately upon infection Vertebrates also have adaptive immunity
1 2 3 4 5 6 7 8 9 The Immune System All animals have innate immunity, a defense active immediately upon infection Vertebrates also have adaptive immunity Figure 43.2 In innate immunity, recognition and
More information