Department of Immunology 2nd Medical School Charles...
Transcript of Department of Immunology 2nd Medical School Charles...
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Immunotherapy
Department of Immunology2nd Medical SchoolCharles University, Prague
December 2008
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Interventions with impacton the immune system
immunomodulation it is not clearly possible to distinguish stimulation from suppression
overreacting IS immunosuppression insufficient IS immunostimulation
antigen specificantigen non-specific
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Legend
effect specificity speed of effect frequency of clinical usage
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Effect of glukocorticosteroids
interaction with gene transcriptionreduction of transcription of genes for pro-inflammatory cytokineslimiting activity and presence of immunocompetent cells in the inflammed region (effect on endothelium, decrease of chemotaxis)influence of number and function of immunocompetent cellsmain usage:
autoimmunity, GvHD prevention and malignancy
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Effect of glukocorticosteroidsEffect Mechanism
Cellular transport neutrophils in circulation release from BM but limited access into the tissues
monocytes in circulation
lymphocytes (mainly CD4+) apoptosis of CD4+ T cellssequestration within BM
Cellular function activity of macrophages maturation of M0 from monocytes
production of proinflammatory cytokines (IL-1, 6, TNF-alfa)
chemotaxis
baktericidia
T cell activation transcription of genes forIL-1,2,3,4,6, IFN-gamma
function of endothelium expression of adhesive molecules
function of NK cells actoivity of NO synthese
Inflammation prostaglandins synthesis inhibition fof phospholipase A2 and cyclooxygenáse
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Adverse effects of glucocorticosteroids
depression, mood changesskin atrophycataractacnehirsutism
proximal myopathy
hypertension
gastric ulcer
diabetes mellitus Cushingoid habitussuppression of adrenal glands
increased infection rate
aseptic necrosis decreased growth dynamics
osteoporosis
impaired wound helaing
Obrázek převzat z www.bfawu.org
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Effects of NSAID on IS
inhibition of cyklooxygenase (COX-1,2) prostaglandin E2 late sensitivity reactionrejection of skin grafts as well as tumours in experimental
animalsserum concentration of RF IgM in patients with RA
main usage: analgesics, antipyreticsone of the most spread drugs in the world
:acylpyrin, ibuprofen, coxiby (Vioxx, Celebrex, GIT bleeding, myocardial infarction...)
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Antihistaminicsgeneration I
dithiadengeneration II
cetirizin, loratadin (Zodac, Zyrtec, Claritine...)decreased transport through hemato-encephalic barrier
generation II-IIIantihistaminics with immunomodulatory effect –decrease of adhesive molecules, anti-inflammatory effectdesloratadin, levocetirizin (Xyzal,Aerius)
použití: alergie, sedace
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Antihistaminics
allergen
IgEFc- ε receptor
degranulation histamin
mast cellX
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Antileukotriens
inhibition of leukotrien production (or its receptors)
zafirlukast, montelukast (Singulair)
usage: mild form of bronchial asthmaactivity-induced asthmaACP-sensitive asthma
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Antileukotriens
phospholipase A2
cyclooxygese
lipoxygenase
leukotriensprostaglandinstromboxans
arachidonic acid
X
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Immunosuppressive drugsa) immunomodulatory drugs
antagonists of folic acid - methotrexatepurin analogs – azathioprin, mykofenolate mofetilalkylating agents - cyklophosphamidsulfasalazinantimalarics
b) drugs binding to immunofilinscyklosporin Atacrolimus (FK 506), sirolimus
c) anti-T, anti-Banti -T:
anti-thymocytic globulinmonoclonal antibodies against CD3, CD4, CD52, CD25organ transplantation– rejection, GvHD
anti-Banti-CD20 (Rituximab)lymphoma, autoimmune disease
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Purine analogsAzathioprine (Imuran)
inhibition of synthesis DNAmetabolites are active (after metabolization in liver)effects are seen after several weeksbone marrow toxicity (granulocytopenia, trombocytopenia)homozygotic deficiency of TPMT (thiopurine-methyl transferase) – life-threatning bone marrow aplasia
Mycofenolate mofetil (CellCept)inhibition of inosine-monophosphate dehydrogenase = key enzyme in de novo synthesis of purines for T and B cells
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Alkylating agensinterference with DNA duplication in pre-mitotic phaseDNA reparation after alkylation is different in particular tissues
Cyclophosphamide metabolites are active (after metabolization in liver) clear mechanism of action is not knownreduced response on antigen stimulationafter discontinuation return to normal takes weeks and monthslong-term application connected with urinary bladder carcinoma
Chlorambucildirectly affects B cellsB-cell tumours, leukaemias
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Agents binding immunophilinsCyclosporine A
binds to intracellular receptors – cyclophilin – calcineurininhibition of translocation of transcription factors into nucleus – inhibition of calcium-dependent processes main effect is decreased production of IL-2 (affects CD4+ dependent processes)main usage
prolongs survival of grafts after transplantationin autoimmune diseases where CD4+ play major role- psoriasis, uveitis, severe RA, AD
effect seen after in 2-12 weeks, sometimes rebound phenomennephrotoxicity, hypertension, hepatotoxicity, gingival hyperplasia, tremor, hirsutism, lymphoma
FK506 (tacrolimus)binds to intracellular protein, similar mechanism as CyA, but 10-100x more potenthigher nephrotoxicity than in CyA
Rapamycine (Sirolimus)similar to FK506, transcription of cytokines not influencedT-bb inhibition of proliferation after stimulation by IL-2, 4
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Anti-cytokine therapyMonoclonal antibodies against TNF - alpha
infliximab (Remicade) - chimeric adalizumab (Humira) - humanizedetanercet (Enbrel) – humanized, receptor inhibitor
anti-dsDNA Ab induction, increased incidence of tuberculosis
RA, JCA, Crohn, Bechtěrev
Inhibition of IL-1 - Interleukin1-RA = Anakinra (Kineret)frequent usage, extremely expensive
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Immunostimulation
bacterial lysates – non-specific activation of macrophages
Bronchovaxom, Ribomunyl, Luivac etc.
chemical immunostimulationnot widely usedIsoprinosine, Levamisol
vaccination
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Immunoglobulin therapysubstitution
primary antibody immunodeficiencysecondary antibody immunodeficiency
immunomodulation of autoimmune diseases 1 g approx. 4x1018 IgG moleculesdifferent dosing
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Mechanisms of IVIg effect - Fc fragment dependent
• blockade of Fc receptors on phagocytes (similar effect as MoAb anti-FcgR, lasts approx. 30 days)• inhibition of proinflammatory cytokines by macrophages (in vitro)• diminishing of NK cells function • effect on Fc receptors on B cells (CD32)
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Mechanisms of IVIg effect - Fab fragment dependent
• different antigen neutralization• anti-idiotype activity• inhibition of B cell differentiation and activation• creation of rheumatoid factors (anti-Ig Ab)
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Clinical use of IVIgeffect proven by RCT
immune trombocytopeniaGuillain-Barré syndromechronic demyelinizating neuropathyKawasaki diseaseDermatomyositisLambert-Eaton myastenic syndromeMultifocal neuropathy
effect not proven by RCTviral induced malaise rheumatoid arthritisjuvenile rheumatoid arthritis
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Monoclonal antibodies in anti-cancer therapy
conjugate of MoAb and cytotoxic drug (methotrexate, vinkristine), toxins (ricin, abrin), radioizotope (iod-131, yttrium-90)immunolocalization of tumour –radioisotope-labeled MoAb (indium-111, technecium-99)
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FDA approved MoAb in cancer
Oldham, J Clin Oncol, 2008
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Immunostimulation by cytokinesIFN alpha
malignancy, hepatitis B and Cflu-like symptoms, malaise, anorexy, mood changes, bone marrow suppression, hepatotoxicity, cardiotoxicity
IFN beta multiple sclerosispossible effect due to inhibition of expression of HLA-DR on glial cells
IFN gammalepromatous lepra, leishmaniasis, chronic granulomatosis
IL-2PID, HIV, increases number of CD4+ T cells
GM-CSF, G-CSFproduction of new granulocytes, monocytes and macrophages
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Immunomodulation with antigen
1. immunotherapy of allergic diseases – use of defined exoallergen
2. cancer immunotherapy – DC, T cells3. adoptive immunotherapy4. immunotherapy of autoimmune diseases –
hypothetical use of defined autoantigen
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Allergen-specific immunotherapy
hyposensitization – repeated application of gradually growing doses of allergenlasts for 3-5 yearsisotype switch, degranulation of mast cellssubcutaneous, inhalation, ingestion
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Allergy – senzitization and memory
Larche, Nat Rev Immunol, 2006
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Immediate phase of allergic inflammation
Larche, Nat Rev Immunol, 2006
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Late phase of allergic inflammation
Larche, Nat Rev Immunol, 2006
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Proposed roleof regulatory T cells in IT
Larche, Nat Rev Immunol, 2006
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Effects of allergen-specific IT
Larche, Nat Rev Immunol, 2006
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Dendritic cells based vaccines
TLR receptors (Toll-like) – essential for the initiation of immune responseIf no TLR costimulation – Tcell anergy, expansion of regulatory T cellsminimal residual diseaseneed for costimulationinadequate activationrole of tumour environment
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DC vaccines in anti-cancer IT
Tacken, Nat Rev Immunol, 2007
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Different DC loading techniques
Duncan, Best Practice and Clinical Haematology, 2008
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Sites of action DC IT in cancer
Melief, Immunity, 2008
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Adoptive cell therapy in cancer
Rosenberg, Nat Rev Immunol, 2008
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Tregs in GvHD
Rocarolo, Nat Rev Immunol, 2007
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Rocarolo, Nat Rev Immunol, 2007
Clinical use of Tregs
diabetes
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Hematopoetic stem cell transplantation
inborn errorsmega-chemotherapy leading to BM ablationGvL effectautoimmune diseasesfirst HSCT and first gene therapy – in PID
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Hematopoetic stem cell transplantation in immunodeficiency
Lancet
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Gene therapy
selective growth advantageADA (no use of PEG-ADA), SCIDsite of integration may influence cell’s fateproto-oncogene LMO2
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Gene therapy – viral vectors
Cavazzana-Calvo, JCI, 2007
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Gene therapy – homologous recombination
Cavazzana-Calvo, JCI, 2007
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Gene therapy - problems
low effectivity of gene transferlow expression of the target proteinmutagenesis - oncogenesisimmunogenicity of the gene/vector
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Future of immunotherapy
antigen specific immunosuppressionlower toxicity and side effectsthe more we know about etiology, the more focused could be the attack
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Psychological aspectsbeta-endorfinsduring exams
lymphopeniaactivity of NK cellsproduction of IFN-gamma
www.glcyd.org
www.thecamreport.com
ales.janda at lfmotol.cuni.cz