(S)-albuterol increases the production of histamine and IL-4 in mast cells

International Archives of Allergy and Immunology
S H ChoC K Oh

Abstract

Racemic albuterol is an equimolar mixture of (R)-albuterol and (S)-albuterol. Previous studies indicated that (S)-albuterol may exert proinflammatory effects. We investigated the effect of (S)-albuterol in the production of mast cell mediators such as histamine and interleukin (IL)-4. Murine mast cells were either unstimulated or stimulated by IgE-receptor crosslinking. Both groups of mast cells were pretreated with either (R)- or (S)-albuterol. Histamine release and IL-4 secretion were measured by ELISA. Expression of L-histidine decarboxylase (L-HDC) and IL-4 was analyzed by semiquantitative reverse transcription-polymerase chain reaction. In the overnight IgE-stimulated group, secreted histamine and total histamine were approximately 19.9 and 18.3% greater in cells co-treated with (S)-albuterol than untreated cells, respectively (n = 4, p < 0.002, p < 0.02), whereas there was no significant difference between the cells treated with (R)-albuterol and untreated cells. When the IgE-stimulated cells were treated with (S)-albuterol for 6 and 24 h, histamine release was approximately 18.3 and 24% greater, respectively (n = 4, p < 0.01). L-HDC is an essential enzyme for synthesizing histamine and its message was significantly induc...Continue Reading

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