Drug “Allergy” Is No Allergy a View Back, with Some Surprising Conclusions
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Drug “allergy” is no allergy a view back, with some surprising conclusions Werner J. Pichler, MD [email protected] [email protected] Division Allergology, Inselspital, ADR-AC GmbH University of Bern, Adverse Drug Reactions – CH 3010 Bern Analysis and Consulting Switzerland Holligenstr 91, CH 3008 Bern, Switzerland Drug allergy allergy an immune response to an innocous substance which leads to symptoms an immune response to a drug or drug- drug allergy metabolite which leads to clinical symptoms activation of innate and adaptive immunity, immune response stimulation of specific T-cells and specific antibodies, inflammatory reaction drug often < 1000 D; small molecules are per se not immunogenic, covalent binding to carrier protein (hapten-carrier complex) required for «immunogenicity» Adverse Drug Reaction (type B): Drug Allergy • anaphylaxis, urticaria • maculo-papular exanthema • bullous exanthema • acute generalized exanthematous pustulosis (AGEP) • Stevens-Johnson Syndrome (SJS) toxic-epidermal necrolysis (TEN) • DRESS, hepatitis , interstitial nephritis,pneumonitis • drug induced autoimmunity (SLE, pemphigus, ...) BIZARRE CLINIC PURPOSE OF IMMUNE REACTION ? How are drugs stimulating the immune system ? Hapten/prohapten specific immunity Penicillin G SMX-NO Haptens are chemically reactive R N H O compounds able to bind H H C N CH S O S 3 H2 covalently to proteins. CH N 3 I O ON a Adduct formation gives a danger N O N N O signal to APC (CD86 A upregulation, IL-1b-secretion) T E Adduct formation forms A neoantigenic determinants able D to induce both a T-cell and B-cell A P immune response. A hapten T stimulates both, T- cells and B- I processing cells !! V E Adverse drug reactions: Drug allergy is a type B reaction Type A reaction Type B reaction Pharmacological action 1 Not a pharmacological action Predictable 2 Not predictable Dose dependent 3 Not dose dependent Rational 4 Not explainable, bizarre MD Rawlins, JW Thompson: IR Edwards, JK Aronson: Pathogenesis of adverse drug reactions; Adverse drug reactions: definitions, Textbook of adverse drug reactions, diagnosis, and management Oxford (1977 & 1981), LANCET (2000) 356: 9237; 1255-1259 DM Davies (Ed.), Oxford Univ. Press, p. 10 & p11 Adverse drug reactions Type A reaction Type B reaction Pharmacological action 1 Not pharmacological action Predictable 2 Not predictable Dose dependent 3 Not dose dependent Rational 4 Not explainable, bizarre The consequence of this «not» classification (type B) are: 1. ADR Type B were considered to be due to the patient: «idiosyncrasy»: the drug is OK, the patient is weird 2. Type B reactions cannot be analysed in usual risk assessments: «fatalism» 3. Dose reduction not considered in avoidance of type B 4. The clinical picture was not explainable, it is «bizarre» Type B reaction as an excuse to do nothing ?? Adverse drug reactions Type A reaction Type B reaction Pharmacological action 1 Not pharmacological action Predictable 2 Not predictable AlainDose de Weck:dependent don`t build your scientific3 Not dose career dependent on research about drug hypersensitivity ! Rational 4 Not explainable, bizarre It isT ahe neglected consequence field of, not this very «not» popular classification with money (type givers B) are (grants: ) no 1.animalADR models Type B, weremainly considered case records to be, seldom due to systematic the patient : investigations«idiosyncrasy, since »:the the topic drug is bizarreis OK, the – your patient research is weird may be considered2. Type bizarreB reactions ........ cannot be analysed in usual risk assessments: «fatalism» 3. Dose reduction not considered in avoidance of type B 4. The clinical picture was not explainable, it is «bizarre» Adverse drug reactions “As more becomes known about the mechanisms of Drug allergy specific adverse drug effects, 1 Not pharmacological action this classification will be revised 2 Not predictable further and classification of currently unclassifiable 3 Not dose dependent ? reactions will become easier” 4 Not explainable, bizarre Edwards & Aronson: LANCET, 356: 1255, 2000 1984 Drug allergy: maculopapular drug eruption(MPE) 45 40 35 30 25 20 15 10 5 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Lymphocyte Transformation Test In PBMC: Stimulation 3H-Thymidine vitro by drug, Incorporation expansion cytotoxicity In vitro PBMC: Stimulation 3H-Thymidine by drug, Incorporation expansion cytotoxicity Lymphocyte transformation test (LTT): To stimulate T cells in vitro with drugs and to conclude to a drug allergy..... ?? Delirant isti helvetii LTT: stimulation of PBMC by drugs 1986 Konz. Autol. Plasma AB-Serum Medikament/Substanz microg SI SI Phenytoin RS 1 16.2 18.7 10 55.1 81.7 50 93.3 72.9 100 63.5 63.8 Lamotrigin RS 0.1 1.4 1.5 1 1.6 1.9 10 2.6 4.4 100 2.9 19.6 Pantoprazol RS 0.1 1.2 1.1 1 2.0 1.0 10 1.1 1.8 50 0.2 0.3 Positive LTT for phenytoin and lamotrigine (DRESS) dose dependent, reaction in PBMC, no liver (metabolism) LTT: stimulation of PBMC by drugs 1986 Konz. Autol. Plasma AB-Serum Medikament/Substanz microg SI SI Phenytoin RS 1 16.2 18.7 10 55.1 81.7 50 93.3 72.9 100 63.5 63.8 LamotriginA RS clear result should0.1 be repeated1.4 , and1.5, 1 1.6 1.9 if confirmed, should10 not and2.6 can not 4.4 be ignored100 2.9 19.6 Pantoprazol RS 0.1 1.2 1.1 Delirant isti1 helvetii2.0 1.0 10 1.1 1.8 50 0.2 0.3 Positive LTT for phenytoin and lamotrigine (DRESS) dose dependent, reaction in PBMC, no liver (metabolism) 1992-1999 Tony Wyss-Coray Christian Brander Daniela Mauri-Hellweg Benno Schnyder Karin Frutig-Schnyder Martin Zanni Salomé von Greyerz Drug specific T-cell clones (TCC) Immunohisto- from blood and tissue chemistry cell culture with drug Expansion of a single cell T-cells Nikhil Yawalkar T-cells TCC phenotype function: cytokines, cytotoxicity proliferation interaction with APCs, tissue cells Perforin - CD4 drug recognition cross-reactivity red - brown Drug stimulated T cells are peculiar 2002 HLA-DR-allele Binding from the independent drug outside to the MHC- APC peptide complex recognition peptide MHC-molecule Additional specificity: MHC class II CD3-TCR drug complex restricted CD8+ high incidence of T cells alloreactivity T cell CD4 and CD8 Oligoclonal TCR Vb T cells stimulated expansion T cell activation How are drugs stimulating T cells ? starts within seconds of drug exposure. Immediate Ca++ influx to oxypurinol (OXP) Hapten Proteasome is formation is not required. not required. The best control for your experiments is questioning it by a new PhD student (or by Dean Naisbitt): he/she will not believe what has been done previously. But when she/he is convinced, your data are solid ! 2000 - 2006 Christoph Burkhardt Dean Naisbitt Nikhil Yawalkar Jan Depta Markus Britschgi Urs Steiner Andreas Beeler Yvonne Hari Oliver Engler Petra Kuechler Antigenicity of a drug DOGMA: “a small compound (<1000D) is not a complete antigen” It is necessary that a drug binds covalently (as a “hapten”) to a carrier molecule to be able to stimulate the immune system ? or can a drug directly stimulate certain immune cells as well, without covalently binding to a carrier molecule ? (p-i-concept) Alain de Weck: be progressive in research but conservative in clinic 2002- 2004 «Pharmacological interaction with immune receptors» = p-i concept 1. Non-covalent binding of drugs to proteins functioning as immune receptors (TCR, HLA) 2 p-i explains an immune stimulation by a drug without postulating antigen-features of a drug ! 3 Landsteiner et al. were right: small molecules do not act as antigen, but they have other means of stimulating the immune system TCR progress means also to change dogma: drugs can stimulate T cells without covalent binding (hapten characteristics) pharmacological interaction with immune receptors p-i concept (2002) ? the drug binds to HLA immune receptor proteins (HLA or TCR)?? (by non-covalent bonds, independent on processing, metabolism, immediately) HLA-peptide-TCR complex Adverse drug reactions Type B reaction Type A reaction immune mediated Pharmacological action 1 Not pharmacological action Predictable 2 Not predictable Dose dependent 3 Not dose dependent Rational 4 Bizarre (immune-mediated = complex diseases !!) Some immune mediated reactions to drugs are «off target» (pharmacological) activities of the drug on immune receptors. TCR transfectionsT11.1 ) -3 10 NRFX (20 g/ml) 2006-2010 8 6 4 2 0 H-thymidine incorporation (cpm x 10 x (cpm incorporation H-thymidine Monika Keller 3 0 250 500 1000 2500 5000 6250 10000 1250025000 50000 105 2.105 4.105 APC (cells/well) Zoi Spanou Interstitial nephritis Cytotoxic mechanism Marianne Lerch Simone Schmid Daphne Schmid Basil Gerber Anna Zawodniak IL-5 IFN-g Precursor Priska Lochmatter analysis phenytoin phenytoin Progress from an unexpected site far away: A U S T R A L I A Lancet 2002: 359:727-737 T A marker for Stevens-Johnson Syndrome A Wen-Hung Chung*, Shuen-Iu Hung†, Hong-Shang Hong*, I Mo-Song Hsih‡, Li-Cheng Yang*, Hsin-Chun Ho*, Jer-Yuarn Wu†§, W Yuan-Tsong Chen†¶ Departments of *Dermatology and ‡Neurology, A Chang Gung Memorial Hospital, Taipei, Taiwan †Institute of Biomedical Sciences, N Academia Sinica, Taipei, Taiwan NATURE|VOL 428 | 1 APRIL 2004 |www.nature.com/nature p-i concept (p-i HLA) TCR a drug fits into a particular HLA molecule the drug binds to an allele-typic region in the HLA by van der Waals forces; it does not bind to the peptide; the {HLA-peptide-drug} complex is then recognized by the TCR HLA-B*5701: binding groove HLA for abacavir Illing et al, Nature 2012 HLA-peptide-TCR complex Ostrov D et al, PNAS 2012 HLA polymorphism in population ca 14 HLA alleles / individual ca.