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Calcium ions mediate essential role on the release of histamine from mast cells of various origin. Caleium ionophore exerts its effect by inducing influx of calcium ions into the mast cells in a dose dependent pattern. However, there are rare study about the effect of high calcium ion and calcium ionophore concentrations. To investigate the effects of high concentrations of these chemicals, the authors releaeed histamine from rat peritoneal mast cells in the presence of various concentraions of calciumion and calcium ionophore A23187. The releaaed hiatamine was assayed using automated fluorospectrometry In the presence of low concentration of calciuum ions, the release of histamine was proportional to the concentration of calcium ionophore. But the release of histamine was inhibited in the presence of high calcium ion and calcium ionophore. In conclusion, the calcium ions have dual effects on the calcium ionophoreinduced histamine release from rat peritoneal mast cells.
Background: Bronchoconstriction associated with aerosolized agents delivered by a metered dose inhaler (MDI) is relatively uncommon, but has been of particular interest. Material and Method: In this study, we investigated to what extent the inert ingredients and propellants (freons) influence pulmonary function in 25 asthmatic patients. Forced expiratory volume in one second(FEV₁) was measured by spirometry, Autospira HI 498(Chest, Japan) before and 1, 3, 5 and 10 minutes after the inhalation of saline control and MDI-placebo containing freons and inert ingredients. Res ult: Twenty four %(6/25) of asthmatics experienced a decrease in FEV20 by 10% or greater when compared to saline control. Number of positive cases in steroid dependent asthmatics is significantly higher compared to non-steroid dependent asthmatics. (p $lt;0.05) Bronchoconstriction associated with the use of MDI-placebo appeared within 3 to 5 minutes and resolved spontaneouly at 10 minutes after the inhalation. Conclusion: The bronchoconstrictive response induced by MDI might be caused by the pro- pellants and/or the other inert ingredients contained in MDIs.
Although positive reactions to cat fur allergen are relatively common during skin test in the evaluation of respiratory allergy, the meaning of positive reaction is obscure. To provide helpful data on the diagnosis of cat fur allergy,authors performed bronchoprovocation test, basophil histamine release test and radioallergosorbent test(RAST) in 9 skin test positive asthmatics. The results were compared with 8 asthmatic controls who showed negative skin reactions to cat fur allergen. Of 9 asthmatic patients,4showed positive reactions to bronchoprovocation test, basophil histamine release test and RAST. These patients are considered to represent clinical sensitivity. Three patients revealed positive reaction to basophil histamine release test, but bronchoprovocation test were negative, suggesting immunologically sensitive and clinically nonsensitive conditions. The remaining 2 patients reacted to none of all the tests, suggesting false positive skin reaction to cat fur allergen.