The release of inflammatory mediators (histamine, PGD2, TxB2 and LTC4) from purified human lung mast cells was characterized by kinetic and anti-IgE dose-response parameters. The relative rate of mediator release was histamine > PGD2 = TxB2 > LTC4, with one half maximal release occurring at approximately 2, 5, and 10 min, respectively. In 2 experiments, stimulation with anti-IgE caused significant quantities of platelet-activating factor (PAF) to appear rapidly (2 min) in the cell pellet; cell-associated PAF declined to low levels by 45 min. The optimal concentration of anti-IgE for the release of the arachidonate cyclooxygenase metabolites PGD2 and TxB2 (0.3 μg/ml) was 10- to 30-fold less than that required for the release of histamine and LTC4 (3 to 10 μg/ml), suggesting that these release processes may have differential IgE Fc receptor cross-linking requirements. At optimal histamine release, the magnitude of the release of each arachidonate metabolite was found to correspond to the magnitude of histamine release, however, suggesting that the 2 processes are linked either in series or in parallel.
|Original language||English (US)|
|Number of pages||4|
|Journal||American Review of Respiratory Disease|
|State||Published - Jun 11 1986|
ASJC Scopus subject areas
- Pulmonary and Respiratory Medicine