Mast CellsUrticaria PigmentosaKetotifenHistamineTryptasesBronchoconstrictionCell DegranulationMediator ComplexInflammation MediatorsSignal TransductionInflammationMediator Complex Subunit 1Cells, CulturedTumor Necrosis Factor-alphaCytokinesMice, Inbred C57BLRNA, MessengerCyclin-Dependent Kinase 8Mice, KnockoutGene Expression RegulationCell LineLipopolysaccharidesDinoprostoneInterleukin-6Platelet Activating Factor