Antigen exposure triggers activation of antigen presenting cells.
Macrophages engulf and eliminate antigens.
Th1 cells promote inflammation contributing to bronchoconstriction and activate lympocytes.
Th2 cells are not usually found in the lungs and cause inflammatory response. They activate IgE and eosinophils. They are also needed to proliferation and differentiation of B cells.
Eosinophils release neuropeptides which cause tissue injury and hyperresponsiveness.
IgE cells bind to an antigen and then bind to mast cells causing the mast cells to release histamine, which causes inflammation, bronchoconstiction and airway oedema.
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