Diisocyanate antigen–enhanced production of monocyte chemoattractant protein-1, IL-8, and tumor necrosis factor-α by peripheral mononuclear cells of workers with occupational asthma

Abstract

Background: Previous studies have shown a significant association between confirmed diisocyanate-induced asthma (DOA) and in vitro production of diisocyanate antigen–stimulated histamine-releasing factors by PBMCs. Chemokines found in PBMC supernatants are known to express histamine-releasing factor activity. Objective: PBMCs of diisocyanate-exposed workers were tested in vitro for diisocyanate antigen–specific enhancement of monocyte chemoattractant protein-1 (MCP-1), monocyte chemoattractant protein-3 (MCP-3), macrophage inflammatory protein-1α, RANTES, IL-8, and T-cell cytokines that could play a regulatory role in chemokine synthesis (IL-4, IL-5, IFN-γ, and TNF-α). Methods: Secretion of chemokines and cytokines was determined by quantitative immunochemical assays of PBMC supernatants. Synthesis of mRNA for β-chemokines was determined by reverse transcription–polymerase chain reaction. Results: PBMCs of workers with DOA showed significantly enhanced secretion for MCP-1 compared with diisocyanate-exposed asymptomatic workers ( P < .05). In vitro induction of antigen-stimulated MCP-1 mRNA synthesis in cultured PBMCs was demonstrated by reverse-transcription polymerase chain reaction. Quantitation of cytokines in supernatants showed increased mean production of IL-8 and TNF-α. IFN-γ, IL-4, and IL-5 were not enhanced in subjects with DOA. Conclusion: Antigen stimulation of MCP-1 and TNF-α suggest that diisocyanate-specific cellular immune reactions result in activation of macrophages, which may be important in the pathogenesis of DOA. (J Allergy Clin Immunol 1998;102:265-74.)