Determinants of the immune-inflammatory response in allergic airway inflammation: Overview of antigen presentation and cellular activation

Under normal circumstances the lung is in a state of immunologic homeostasis, a condition in which exposure to innocuous antigens does not lead to immune-inflammatory responses. This is the only reasonable solution to the dilemma faced by the lung: The need to interact with the external environment and the need to avoid responding to most of the environmental antigens to which it is exposed. In allergic diseases, such as asthma, this …