
| 10.1007/978-1-4614-7261-2_3
http://scihub22266oqcxt.onion/10.1007/978-1-4614-7261-2_3
 C7120502!7120502!C7120502
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Drug+Allergy � ; � (�): 37-90 Nephropedia Template TP
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Mechanisms of Hypersensitivity #MMPMIDC7120502Baldo BA; Pham NHDrug Allergy �[]; � (�): 37-90 PMIDC7120502show ga
Allergic reactions to drugs are not always the result of the drug?s protein-binding capacity, biotransformation, or degradation. Mediator release may occur via cross-linking of cell-bound IgE by di-(multi-) valent free drug. Physiological and pharmacological effects of histamine are mediated through four receptors, H1, H2, H3, and H4. The H3 receptor has a regulatory role in the release of neurotransmitters such as serotonin and dopamine; the H4 receptor exerts a chemotactic effect on several cell types associated with allergy and asthma. Cysteinyl leukotrienes and PAF are powerful mediators of anaphylaxis, asthma, and shock. Sphingosine-1-phosphate, elevated in the lungs of asthmatics, regulates pulmonary epithelium permeability and contributes to the pathogenesis of anaphylaxis. Urticaria is a heterogeneous disease with many subtypes. Both ACE inhibitors and angiotensin II receptor blockers may cause angioedema. Abacavir changes the shape of the HLA antigen-binding cleft producing an alteration in the repertoire of self-peptides that bind HLA-B*57:01 and a T cell response to self-proteins. Drug-induced delayed-type cutaneous hypersensitivity reactions are mediated by CD4+ and CD8+ CD3+ T cells in the dermis and epidermis. Granulysin appears to be a key molecule for keratinocyte killing in TEN/SJS. Drugs provide good examples of types II (immune hemolytic anemia, drug-induced thrombocytopenia) and III (serum sickness-like) hypersensitivities.�
  
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