immunodeficiencies and autoimmune diseases
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Immunodeficiencies and autoimmune diseases. Martin Liška. Immunodeficiencies. Humoral – innate immunity - complement, MBL acquired immunity – immunoglobulins (B lymphocytes) Cell mediated immunity – innate immunity – phagocytes - PowerPoint PPT PresentationTRANSCRIPT
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Immunodeficiencies and
autoimmune diseases
Martin Liška
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Immunodeficiencies
• Humoral – innate immunity - complement, MBL acquired immunity – immunoglobulins (B lymphocytes)
• Cell mediated immunity – innate immunity – phagocytes - acquired immunity – T lymphocytes
• Primary – congenital, genetically defined, symptoms predominantly at an early age
• Secondary – the onset of symptoms at any age chronic diseases the effects of irradiation immunosuppression surgery, injuries stress
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Immunodeficiencies – critical life periods in respect to symptoms onset
• Newborn age - severe primary disorders of cell mediated immunity
• 6 mth. – 2 yrs. – severe humoral immunodeficiencies cong./transient
• 3 - 5 yrs. – transient and selective humoral immunodeficiencies, secondary immunodeficiencies
• 15 – 20 yrs. – hormonal instability, thymus involution, life-style changes, some typical infections first symptoms of CVID
• Middleage – often excessive workload, stress first symptoms of autoimmune disorders (also immunodeficiency)
• Advanced and old age – rather symptoms of severe secondary immunodeficiencies,
repercussion of functional disorders
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Immunodeficiencies – major clinical features
• Antibodies - microbial infections (encapsulated bacterias) respiratory - pneumonia, sinusitis, otitis GIT – diarrhea• Complement – microbial infections (pyogenic), sepsis various systems affection edema (HAE) – C1-INH deficiency• T lymphocytes - bacterial, fungal, viral GIT – diarrhoea respiratory – pneumonia, sinusitis• Phagocytes - abscesses, recurrent purulent skin infections granulomatous inflammations
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I. Primary immunodeficiencies – phagocytic cell defects
1/ Quantitative – decreased numbers of granulocytes –neutrophil elastase mutation
Congenital chronic agranulocytosis
Cyclic agranulocytosis (neutropenia)
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I. Primary immunodeficiencies – phagocytic cell defects
2/ Qualitative – phagocytes functional disorders, various enzyme deficits, inability of phagocytes to degrade the ingested material
a/ Chronic Granulomatous Disease (CGD)• Approximately in 60% X-linked • Enzymatic inability to generate toxic oxygen metabolites (H2O2) during
oxygen consumption) - result of defect in neutrophilic cytochrome b (part of complex containing NADPH oxidase)
• Inability to kill bacteria such as Staph.aureus, Pseud.aeruginosa that produce the enzyme catalase
• Clinical features: granulomas in many organs• Treatment: long-term ATB administration
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I. Primary immunodeficiencies – phagocytic cell defects
b/Myeloperoxidase deficiency• Susceptible to Staph.aureus or C.albicans infections
c/Chédiak-Higashi syndrome• Clinical features: recurrent, severe, pyogenic infections
(streptococcal, staphylococcal)• Defective intracellular killing of bacteria (neutrophils contain
abnormal giant lysosomesd/HyperIgE (Job’s) syndrome• Recurrent “cold” staphylococcal abscesses, chronic eczema,
otitis media• Extremely high serum IgE levels
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II. Primary immunodeficiencies – B cell disorders
Bruton’s X-linked hypogamaglobulinemia• Blockage in the maturation of pre-B lymphocytes into B lymphocytes (tyrosine
kinase defect)• Undetectable or very low serum levels of Ig• Pneumonia, pyogenic otitis, complicated sinusitis, increased occurrence of
pulmonary fibrosis• Treatment: life-long IVIG substitution
CVID – Common Variable ImmunoDeficiency• B cell functional disorder, mostly low levels of IgG and IgA• Symptoms’ onset between 2nd and 3rd decade• Recurrent respiratory tract infections (pneumonia)• Treatment: IVIG substitution
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II. Primary immunodeficiencies – B cell disorders
Selective IgA deficiency• Disorder of B cell function • Recurrent mild/moderate infections (respiratory, GIT, urinary tract) or
asymptomatic• Risk of reaction to live attenuated vaccines or generation of anti-IgA
antibodies after a blood transfusion
Selective IgG subclasses or specific IgG deficiency • B cell function disorder• Onset of symptoms in childhood, mostly respiratory tract infections
caused by encapsulated bacteria (H.influenzae, Pneumococci) Transient hypogammaglobulinemia of infancy
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III. Primary immunodeficiencies – T cell disorders
diGeorge syndrome• Disorder of prethymocytes maturation due to absence of thymus (disorder
of development of 3rd and 4th branchial pouch) • Congenital heart diseases• The onset of symptoms after the birth – hypocalcemic spasms and
manifestations of cong.heart disease• Immunodeficiency could be only mild, the numbers of T lymphocytes later
usually become normal• Treatment symptomatic
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IV. Primary immunodeficiencies – combined defects of T and B cells
SCID – Severe Combined ImmunoDeficiency• X-linked recessive or AR disease, combined disorder of humoral and cell mediated
immunity• Severe disorder (patients often die during first 2 years of life), symptoms’ onset
soon after the birth (severe diarrhoea, pneumonia, meningitis, BCGitis)• Immunological features: typically lymphopenia and thymus hypoplasia• Forms: AR form – often enzymatic deficiency (ADA, PNP) that leads to accumulation of metabolites toxic to DNA synthesis (lymphocytes) X-linked form – disorder of stem-cell Treatment: ATB, IVIG BMT is of critical significance
Wiskott-Aldrich syndrome • trombocytopenia, eczema, recurrent infections (encapsulated microbes), decreased
IgM levels
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V. Primary immunodeficiencies – complement system disorders
Hereditary angioedema (HAE)
• Absence or functional deficiency of C1-inhibitor• Anaphylactoid reactions with skin and/or mucosal (oral, laryngeal, gut)
edemas caused by C3a a C5a• Injuries or surgical/stomatological operations are mostly the triggering
factor • Laryngeal edemas could be life-threatening, immediate treatment is
necessary !• Treatment: preventive – androgens, EACA immediate – C1-INH concentrate or fresh frozen plasma administration• Secondary forms also exist !
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Secondary immunodeficiencies
• Acute and chronic viral infections – infectious mononucleosis, influenza• Metabolic disorders – diabetes mellitus, uremia• Autoimmune diseases – autoantibodies against immunocompetent cells
(neutrophils, lymphocytes); autoimmune phenomena also after administration of certain drugs (e.g. oxacilin, quinidine)
• Chronic GIT diseases• Malignant diseases (leukemia)• Hypersplenism/asplenia• Burn, postoperative status, injuries• Severe nutritional disorders• Chronic infections• Ionizing radiation• Drug induced immunodeficiencies (chemotherapy)• Immunosupressissive therapyve therapy
• Chronic stress• Chronic exposure to harmful chemical substances
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Secondary immunodeficiencies
Chronic fatigue syndrome• First, it is necessary to exclude all chronic diseases which can lead to
fatigue: • autoimunity • malignancy• focal infection• neurological disorders• metabolic disorders• depression
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Secondary immunodeficiencies - A.I.D.S.
• Caused by retrovirus HIV 1 or HIV 2• Virus has a tropism for cells bearing CD4 surface marker (Th CD4+
lymphocytes); also affects macrophages and CNS cells• Viral genome transcribes into human DNA and infected cell provides viral
replication• Transmission: sexual intercourse contact with blood endouterine (mother – fetus, breast milk)• Phases: acute (flu-like sy) asymptomatic – several years, viral replication symptomatic – infections, autoimmune disorders, malignancy,
allergy final – systemic breakdown, opportune infections
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A.I.D.S. - Treatment
• Reverse transcriptase inhibitors (e.g.zidovudine)• Protease inhibitors - block the viral protease enzyme• Combined drug therapy• Antimicrobial agents
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AUTOIMMUNE DISEASES
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Autoimmune disease
• Results from a failure of self-tolerance• Immunological tolerance is specific
unresponsiveness to an antigen• All individuals are tolerant of their own (self)
antigens
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AUTOIMMUNE PATOLOGICAL RESPONSE- ETIOLOGY
• the diseases are chronic and usually irreversible• incidence: 5%-7% of population, higher frequencies in
women, increases with age• factors contribute to autoimmunity: - internal (HLA association, polymorphism of cytokine genes,
defect in genes regulating apoptosis, polymorphism in genes for TCR a H immunoglobulin chains, association with immunodeficiency, hormonal factors)
- external (infection, stress by activation of neuroendocrine axis and hormonal dysbalance, drug and ionization through modification of autoantigens)
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CLINICAL CATEGORIES
• systemic - affect many organs and tissue
• organoleptic - affect predominantly one organ accompanied
by affection of other organs (inflammatory bowel diseases, celiac disease, AI hepatitis, pulmonary fibrosis)
• organ specific - affect one organ or group of organs connected
with development or function
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SYSTEMIC AUTOIMMUNE DISEASES
• Systemic lupus erythematosus• Rheumathoid arthritis• Sjögren‘s syndrome• Dermatopolymyositis• Systemic sclerosis• Mixed connective tissue disease • Vasculitis
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SYSTEMIC LUPUS ERYTHEMATOSUS
• chronic, inflammatory, multiorgan disorder
• autoantibodies react with nuclear material and attack cell function, immune complexes with dsDNA deposit in the tissue
• general symptoms: include malaise, fever, weight loss• multiple tissue are involved including the skin, mucosa,
kidney, joints, brain and cardiovascular system
• characteristic features: butterfly rash, renal involvement, CNS manifestation, pulmonary fibrosis
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DIAGNOSTIC TESTS
• a elevated ESR (erythrocyte sedimentation rate), low CRP, trombocytopenia, leucopenia, hemolytic anemia, decreased levels of complement compounds (C4, C3), elevated serum Ig levels, immune complexes in serum
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AUTOANTIBODIES
• Autoantibodies: ANA, dsDNA (double-stranded), ENA (SS-A/Ro, SS-A/La), Sm, against histones, phospholipids
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RHEUMATOID ARTHRITIS
• chronic, inflammatory disease with systemic involvement• characterized by an inflammatory joint lesion in the synovial membrane,
destruction of the cartilage and bone, results in the joint deformation• clinical features: arthritis, fever, fatigue, weakness, weight loss• systemic features: vasculitis, pericarditis, uveitis, nodules under skin,
intersticial pulmonary fibrosis• diagnostic tests: elevated C- reactive protein and ESR, elevated serum gammaglobulin levels - autoantibodies against IgG = rheumatoid factor (RF), a-CCP (cyclic citrulline peptid), ANA - X-rays of hands and legs- show a periarticular porosis, marginal erosion
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SJÖGREN‘S SYNDROME
• chronic inflammatory disease affecting exocrine glands• the primary targets are the lacrimal and salivary gland duct epithelium• general features: malaise, weakness, fever• primary syndrome - features: dry eyes and dry mouth, swollen salivary
glands, dryness of the nose, larynx, bronchi and vaginal mucosa, involvement kidney, central and periferal nervous system, arthritis
• secondary syndrome – is associated with others AI diseases (SLE, RA, sclerodermia, polymyositis, primary biliary cirhosis,AI thyroiditis)
• autoantibodies against ENA (SS-A, SS-B), ANA, RF• The Schirmer test - measures the production of tears
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Heliotrope rash is a violaceous eruption on the upper eyelids, often with swelling
• a connective-tissue disease related to polymyositis (PM) that is characterized by inflammation of the muscles and the skin.
Gottron's sign is an erythematous, scaly eruption occurring in symmetric fashion over the MCP and interphalangeal joints
Dermatopolymyositis
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Dermatopolymyositis
• Elevated creatine phosphokinase (CPK)
• muscle biopsy (a mixed B- and T-cell perivascular inflammatory infiltrate, perifascicular muscle fiber atrophy)
• EMG (electromyogram)• autoantibodies - ENA (Jo-1)
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Systemic sclerosis
• sclerosis in the skin or other organs• Diffuse scleroderma (progressive systemic
sclerosis) is the most severe form, involves skin, will generally cause internal organ
damage (specifically the lungs and gastrointestinal tract)
• The limited form is much milder• The limited form is often referred to as CREST
syndrome (CREST is an acronym for the five main features: Calcinosis, Raynaud's syndrome, Esophageal dysmotility, Sclerodactyly, Telangiectasia
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Immunological findings
• ANA, ENA - anti-Scl-70 (fluorescence of nucleolus), anti-centromers
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Mixed connective tissue disease
• combines features of polymyositis, systemic lupus erythematosus, scleroderma, and dermatomyositis (overlap syndrome)
• Causes : joint pain/swelling, malaise, Raynaud phenomenon, muscle inflammation and sclerodactyly (thickening of the skin of the pads of the fingers)
• Distinguishing laboratory characteristics: a positive, speckled anti-nuclear antibody (ANA)
and anti-U1-RNP antibody (ENA)
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Vasculitis
• characterized by inflammatory destruction of vessels leading to thrombosis and aneurysms• proliferation of the intimal part of blood-vessel wall
and fibrinoid necrosis• affect mostly lung, kidneys, skin
• diagnostic tests: elevated ESR, CRP, leucocytosis, biopsy of affected organ (necrosis, granulomas), angiography
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Vasculitis
• p- ANCA (myeloperoxidase) positivity (Polyarteritis nodosa, Churg- Strauss, Microscopic polyarteritis nodosa)
• c- ANCA (serin proteinase) positive (Wegener granulomatosis, Churg- Strauss syndrome)
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Classification
• Large vessel vasculitis (Takayasu arteritis, Giant cell (temporal) arteritis)
• Medium vessel vasculitis (Polyarteritis nodosa, Wegener's granulomatosis, Kawasaki disease)
• Small vessel vasculitis (Churg-Strauss arteritis, Microscopic polyarteritis, Henoch-Schönlein purpura)
• Symptoms: fatigue, weakness, fever, arthralgias, abdominal pain, hypertension, renal insufficiency, and neurologic dysfunction
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ORGANOLEPTIC AUTOIMMUNE DISEASES
• Ulcerative colitis• Crohn‘s disease• Autoimmune hepatitis• Primary biliary cirhosis• Pulmonary fibrosis
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Ulcerative colitis
• chronic inflammation of the large intestine mucosa and submucosa
• features: diarrhea, bloody and mucus stools• extraintestinal features (arthritis, uveitis)• autoantibodies against pANCA, a- large intestine
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Crohn‘s disease
• the granulomatous inflammation of whole intestinal wall with ulceration and scarring that can result in abscess and fistula formation
• the inflammation of Crohn's disease the most commonly affects the terminal ileum, presents with diarrhea and is accompanied by extraintestinal features - iridocyclitis, uveitis, artritis, spondylitis
• antibodies against Saccharomyces cerevisiae (ASCA), a- pancreas
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AUTOIMMUNE HEPATITIS
• type I – association with autoantibodies against smooth muscles SMA, ANA, ANCA, SLA
• type II – autoantibodies against microsomes LKM-1 = liver-kidney microsomes
• type III – autoantibodies against SLA (solubile liver
antigen)
• type IV – overlap syndrome with PBC – autoantibodies against mitochondries AMA
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AUTOIMMUNE ENDOCRINOPATHY
• Hashimoto‘s thyroiditis • Graves-Basedow disease • Diabetes mellitus I. type • Addison‘s disease • Autoimmune polyglandular syndrome
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Hashimoto‘s thyroiditis
• thyroid disease result to hypothyroidism on the base of lymphocytes and plasma cells infiltrate
• autoantibodies against thyroidal peroxidase (a-TPO)
and/or against thyroglobulinu (a-TG)
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Grave‘s disease
• thyrotoxicosis from overproduction of thyroid hormone (patient exhibit fatigue, nervousness, increased sweating, palpitations, weight loss,
exophtalmus)
• autoantibodies against thyrotropin receptor, autoantibodies cause thyroid cells proliferation
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Diabetes mellitus (insulin- dependent)
• characterized by an inability to process sugars in the diet, due to a decrease in or total absence of insulin production
• results from immunologic destruction of the insuline- producing β-cells of the islets of Langerhans in the pancreas
• autoantibodies against GAD- glutamic acid decarboxylase = primary antigen), autoantibodies anti- islet cell, anti- insulin
• islets are infiltrated with B and T cells
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Polyglandular autoimmune syndrome
• combination of several different AI endocrinopathies • autoantibodies appear in according with the
connected disorders
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AUTOIMMUNE NEUROPATHY
• Guillain-Barré syndrome (acute idiopathic polyneuritis)
• Myasthenia gravis
• Multiple sclerosis
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Multiple sclerosis
• chronic demyelinizing disease with abnormal reaction T cells to myeline protein on the base of mimicry between a virus and myeline protein
• features: weakness, ataxia, impaired vision, urinary bladder dysfunction, paresthesias, mental abberations
• autoantibodies against MOG (myelin-oligodendrocyte glycoprotein)
• Magnetic resonance imaging of the brain and spine shows areas of demyelination
• The cerebrospinal fluid is tested for oligoclonal bands, can provide evidence of chronic inflammation of the central nervous system
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AUTOIMMUNE CYTOPENIA
• AI hemolytic disease- autoantibodies against membrane erythrocyte antigens
• AI trombocytopenia - autoantibodies against trombocyte antigens (GPIIb/IIIa)
• AI neutropenia - autoantibodies against membrane neutrofil antigens
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Immunosuppressive drugs
• Drugs that inhibit or prevent activity of the immune system
• They are used in immunosuppressive therapy to:• Prevent the rejection of transplanted organs and tissues
(bone marrow, heart, kidney, liver) • Treat autoimmune diseases or diseases that are most
likely of autoimmune origin (rheumatoid arthritis, multiple sclerosis, myasthenia gravis, systemic lupus erythematosus, Crohn's disease, pemphigus, ulcerative colitis).
• Treat some other non-autoimmune inflammatory diseases (allergic asthma, atopic eczema).
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Glucocorticoids
• suppress the cell-mediated immunity- act by inhibiting genes that code for various cytokines (e.g.IL-2)
• decrease cytokine production reduces the T cell proliferation.
• suppress the humoral immunity• side-effects: hypertension, dyslipidemia,
hyperglycemia, peptic ulcers, osteoporosis, disturbed growth in children
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Drugs affecting the proliferation of both T cells and B cells
• Cyclophosphamide -very efficient in the therapy of systemic lupus erythematosus, autoimmune hemolytic anemias
• high doses cause pancytopenia and hemorrhagic cystitis
• Methotrexate is a folic acid antagonist, acts during DNA and RNA synthesis, and thus it is cytotoxic during the S-phase of the cell cycle; used in the treatment of autoimmune diseases (RA, Crohn's disease) and in transplantations.
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Drugs affecting the proliferation of both T cells and B cells
• Azathioprine is a purine synthesis inhibitor, inhibiting the proliferation of cells, especially leucocytes; SLE, RA, sclerosis multiplex, transplantation
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Drugs blocking the activation of lymphocytes
• Cyclosporin A- inhibits calcineurin, which is responsible for activating the transcription of interleukin-2; inhibits cytokines production and interleukin release
• Used to prevent rejection reactions
• Side effects: nephrotoxicity, neurotoxicity, hypertension, dyslipidemia, hyperglycemia
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Monoclonal antibodies
• Monoclonal antibodies are directed towards exactly defined antigens
• Daclizumab - acts by binding the IL-2a receptor's α chain, preventing the IL-2 induced clonal expansion of activated lymphocytes and shortening their survival
• used in the prophylaxis of the acute organ rejection after the bilateral kidney transplantation