Title: AUTOIMMUNE DISEASES
1 AUTOIMMUNE DISEASES
Martin Liška
2Autoimmune 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
3Autoimmunity
- is defined as an immune response against self
antigens - The principal factors in the development of
autoimmunity are the inheritance of
susceptibility genes and environmental triggers,
such as infections - Most autoimmune diseases are polygenic and are
asssociated wih multiple gene loci, the most
important of which are the MHC genes - Infections may activate self-reactive
lymphocytes, thereby triggering the development
of autoimmune diseases
4AUTOIMMUNE PATOLOGICAL RESPONSE- ETIOLOGY
- the diseases are chronic and usually irreversible
- incidence 5-7 of population, higher
frequencies in women, increases with age - factors contributing to autoimmunity
-
- - internal (HLA association, polymorphism
of cytokine genes, defect in genes regulating
apoptosis, polymorphism in genes for TCR and H
immunoglobulin chains, association with
immunodeficiency, hormonal factors) - - external (infection, stress by activation
of neuroendocrinal axis and hormonal dysbalance,
drug and ionization through modification of
autoantigens)
5Type II hypersensitivity reaction
- IgM and IgG Ab promote the phagocytosis of cells
which they bind, induce inflammation by
complement and Fc receptor- mediated leukocyte
recruitment , and may interfere with the
functions of cells by binding to essential
molecules and receptors. - Graves disease, Pernicious anemia, Myasthenia
gravis, Acute rheumatic fever, Goodpastures
syndrome, Pemphigus vulgaris, Autoimmune
hemolytic anemia or thrombocytopenic purpura
6Type III hypersensitivity reaction
- Ab may bind to circulating antigens to form
immune complexes, which deposit in vessels and
cause tissue injury. - Injury is due mainly to leukocyte recruitment and
inflammation. - Systemic lupus erythematosus, Polyarteritis
nodosa, Poststreptococcal glomerulonephritis
7Type IV hypersensitivity reaction
- T cell- mediated diseases are caused by
Th1-mediated delayed-type hypersensitivity
reactions or Th17- mediated inflammatory
reactions, or by killing of host cells by CD8
CTLs (cytotoxic lymphocytes). - Diabetes mellitus (insulin-dependent), Rheumatoid
arthritis, Multiple sclerosis, Inflammatory bowel
disease
8CLINICAL CATEGORIES
- systemic
- - affect many organs and tissue
- organoleptic
- - affect predominantly one organ accompanied
by affection of other organs (inflammatory bowel
diseases, coeliac disease, AI hepatitis,
pulmonary fibrosis) -
- organ specific
- - affect one organ or group of organs
connected with development or function -
9EXAMPLES OF SYSTEMIC AUTOIMMUNE DISEASES
10SYSTEMIC AUTOIMMUNE DISEASES
- Systemic lupus erythematosus
- Rheumathoid arthritis
- Sjögrens syndrome
- Dermatopolymyositis
- Systemic sclerosis
- Mixed connective tissue disease
- Vasculitis
11SYSTEMIC 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
12DIAGNOSTIC 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
13AUTOANTIBODIES
- Autoantibodies ANA, dsDNA (double-stranded), ENA
(SS-A/Ro, SS-B/La), Sm, against histones,
phospholipids
14RHEUMATOID 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
15SJÖGRENS 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
16Dermatopolymyositis
- 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
Heliotrope rash is a violaceous eruption on the
upper eyelids, often with swelling
17Dermatopolymyositis
- 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)
18Systemic 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
19Immunological findings
- ANA, ENA - anti-Scl-70 (fluorescence of
nucleolus), anti-centromers
20Mixed 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)
21Vasculitis
- 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
22Vasculitis
- p- ANCA (myeloperoxidase) positivity
(Polyarteritis nodosa, Churg- Strauss,
Microscopic polyarteritis nodosa) - c- ANCA (serin proteinase) positive (Wegener
- granulomatosis, Churg- Strauss syndrome)
23Classification
- 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
24EXAMPLES OF ORGANOLEPTIC AUTOIMMUNE DISEASES
25ORGANOLEPTIC AUTOIMMUNE DISEASES
- Ulcerative colitis
- Crohns disease
- Autoimmune hepatitis
- Primary biliary cirhosis
- Pulmonary fibrosis
26Ulcerative 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
-
27Crohns 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
28- Primary biliary cirhosis
- autoimmune disease of the liver marked by the
slow progressive destruction of the small bile
ducts can lead to cirrhosis - AMA antimitochondrial autoantibodies
29AUTOIMMUNE 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
- antimitochondrial
autoantibodies (AMA)
30Pulmonary fibrosis
- is associated with SLE, RA, systemic sclerosis,
polymyositis - autoantibodies nonspecific- RF, ANA
- biopsy, lung function testing, X-ray
31ORGAN SPECIFIC AUTOIMMUNE DISEASES
- Autoimmune endocrinopathy
- Autoimmune neurological diseases
- Autoimmune cytopenia
32AUTOIMMUNE ENDOCRINOPATHY
- Hashimotos thyroiditis
- Graves-Basedow disease
- Diabetes mellitus I. type
- Addisons disease
- Autoimmune polyglandular syndrome
- Pernicious anemia
33Hashimotos thyroiditis
- thyroid disease result to hypothyroidism on the
base of lymphocytes and plasma cells infiltrate -
- autoantibodies against thyroidal peroxidase
(a-TPO) and/or against thyroglobulin (a-TG)
34- infiltrate of plasma cells and lymphocytes with
germinal center formation is seen in this thyroid
35Graves 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
36Diabetes 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 ß-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
-
37Polyglandular autoimmune syndrome
- combination of several different AI
endocrinopathies -
- autoantibodies appear in according with the
connected disorders
38Pernicious anemia
- the deficiency of the intrinsic factor results in
inadequate and abnormal formation of erythrocytes
and failure to absorb vitamin B12 - clinical feature- atrophic gastritis, macrocytic
anemia - autoantibodies against parietal cells of gastric
mucose, against intrinsic factor (transportation
of B12 vitamin)
39AUTOIMMUNE NEUROPATHY
- Guillain-Barré syndrome (acute idiopathic
polyneuritis) - Myasthenia gravis
- Multiple sclerosis
40Guillain-Barré syndrome
- inflammation demyelinates peripheral neuropathy
that causes progressive muscle weakness and
paralysis - the cause is the loss of myelin
-
- occurs often 1-3 weeks after infection
(Campylobacter jej.) - features progressive weakness and paresthesia
of the lower and later upper extremitas and
respiratory muscles, weakness can leads to
paralysis and respiratory failure - immunologic findings autoantibodies against
ganglioside membrane
41Myasthenia gravis
- chronic disease with impaired neuromuscular
transmission - characterized by muscle weakness and fatigue
- the muscle weakness and neuromuscular
dysfunction result from blockage and depletion of
acetylcholine receptors at the myoneural junction - immunological findings autoantibodies against
Ach receptors - ptosis of the eye
42Multiple 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-oligodendrocyt
e 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
43AUTOIMMUNE CYTOPENIA
- AI hemolytic disease- autoantibodies against
membrane erythrocyte antigens - AI trombocytopenia - autoantibodies against
- trombocyte antigens (GPIIb/IIIa)
- AI neutropenia - autoantibodies against
- membrane neutrofil antigens
44IMMUNOSUPPRESSION
- non-specific treatment
- examples of drugs
- indication
- risks
45Immunosuppressants
- 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).
46Glucocorticoids
- 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, causing B cells to
express smaller amounts of IL-2 and IL-2
receptors- this diminishes both B cell clone
expansion and antibody synthesis.
47Glucocorticoids
- leads to diminished eicosanoid production,
suppression of the cyclooxygenase expression - Glucocorticoids also stimulate the lipocortin-1
escaping to the extracellular space, where it
binds to the leucocyte membrane receptors and
inhibits epithelial adhesion, migration,
chemotaxis, phagocytosis, respiratory burst, and
the release of various inflammatory mediators
from neutrophils, macrophages, and mastocytes. - side-effects hypertension, dyslipidemia,
hyperglycemia, peptic ulcers, osteoporosis,
disturbed growth in children
48Drugs 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.
49Drugs 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 - Mycophenolate mofetil affects the enzyme that
controls the purine synthesis - Used in transplantation of solid organ
50Drugs blocking the activation of lymphocytes
- Tacrolimus - prevents the cell from transitioning
from the G0 into G1 phase of the cell cycle - Used to prevent rejection reactions, atopic
eczema - 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
51Monoclonal antibodies
- Monoclonal antibodies are directed towards
exactly defined antigens - Daclizumab - acts by binding the IL-2a receptor's
a 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