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614          Part five  Allergic Diseases


                     ICD                                   ACD                                     AD
                                              Antigen   Second exposure  Antigen        Disease alters threshold for
                                            sensitization             Elicitation       ICD, ACD, and self-reactivity

                  1 Irritant                            1 Allergen                               Antigen




            IL-1α
                                 IL-1α
                                                                                                                   KCs
                     2                       IL-1α                      IL-1α                 Disturbed barrier
         IL-1α      IL-1α            KCs                                KCs                      (  TEWL)
                    IL-1β
                    TNF-α                                                 5
           LC       GM-CSF                           LC                 Further        LC
                    IL-8                                              stimulation
           3                                                     2      of KCs                   iDEC    LC
                                                                IL-1α
                                                                IL-1β
                                                                TNF-α
                                                                GM-CSF
                                                      dDC       IL-8                  dDC        dDC    Eotaxin
                                                                IL-18
                          dDC    3

                                                                                               TSLPR          TSLP
                                                          Vasodilation                                dDC
                              Cellular                 Cellular recruitment
                            5   infiltration               Infiltration                                     OX40L
                                                Lymph          4                                   OX40
                                              3  node              Th1                    Lymph           Th2   IL-4
                                                                                                                IL-13
                                                                         IFN-γ
                                                                         TNF              node                  IL-31
                               Lymphocyte
                                                                    Th2  IL-4                              Th1  IFN-γ
                                                    Th1                  IL-5              T cell
                                                                         IL-13
                                Neutrophil                               IL-17      LC
                                 Th17                              Th17  IL-22                            Th22  IL-22
                                             Naive                                    Naive
                                             T cell   Th2                             T cell
                                                                   Treg  IL-10     dDC                    Th17  IL-17
                                                                                                                IL-22
                               Macrophage                                TGF-β
                                                    Th17                                   B cell
                                                                  Mast  TNF         Th2                  Mast  TNF
                                                Treg              cell  Histamine         IL-4           cell  Histamine

          Endothelial           Mast cell     Hapten-specific                        IgE Class
          cell                                T cell proliferation  Eosino-  MBP     switchery           Eosino-  MBP
                                                                    phil  TNF-α                            phil  TNF-α

             3
                ICAM E-selectin               Treg       Th2   Mast  Eosino-         T cell       Mast

                                                                                                                 phil
         Blood vessel  4  Vasodilation              Th1        cell   phil  Treg                   cell        Eosino-
                       Cellular recruitment
      A                                    B                                      C
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