Abstract:
BACKGROUND:Mannitol-induced bronchoconstriction in subjects with exercise-induced asthma is associated with increased urinary excretion of 9alpha, 11beta-PGF(2), a metabolite of prostaglandin D(2) (PGD(2)) serving as a mast cell marker. It has however been questioned whether or not human mast cells release PGD(2) and leukotriene C(4) (LTC(4)) after osmotic challenge with mannitol in vitro. METHODS:Cord blood-derived human mast cells were stimulated osmotically, immunologically or with a combination of both. Supernatants were analysed for PGD(2), LTC(4) and histamine contents with enzyme immunoassays. RESULTS:Significant release of de novo synthesized eicosanoids, predominantly PGD(2) [12 (8.8, 14) pmol/10(6)cells; median (25th, 75th percentile) but also LTC(4) (0.1 (0.08, 0.15) pmol/10(6) cells] were found in mast cells in vitro in response to 0.7 M mannitol stimulation. A massive release of histamine [70 (5.3)% of total; mean (SEM)] was also found. There were no correlations between the levels of released mediators after mannitol stimulation. In contrast, there was a correlation between release of PGD(2) and LTC(4), following immunological stimulation. CONCLUSION:The findings support that hyperosmolar challenge activates mast cells, but different than antigen stimulation.
journal_name
Allergyjournal_title
Allergyauthors
Gulliksson M,Palmberg L,Nilsson G,Ahlstedt S,Kumlin Mdoi
10.1111/j.1398-9995.2006.01213.xsubject
Has Abstractpub_date
2006-12-01 00:00:00pages
1473-9issue
12eissn
0105-4538issn
1398-9995pii
ALL1213journal_volume
61pub_type
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