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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Release of slow reacting substance of anaphylaxis (SRS-A) from human leukocytes by the calcium ionophore A23187.

The ability of the calcium ionophore A23187 to release slow reacting substance of anaphylaxis (SRA-A) from human leukocytes was studied. About 25 times more SRS-A activity was released from aliquots of leukocytes by ionophore stimulation than by antigen stimulation, although comparable amounts of histamine were released. Cell separation studies revealed that granulocytes other than basophils were also capable of releasing SRS-A. The contractile activity released after challenge with ionophore appeared physicochemically identical to the SRS-A of rat or human origin released by antigen challenge in terms of its stability to base hydrolysis, inactivation by arylsulfatase, and chromatographic behavior on silicic acid and Sephadex LH-20 columns. We suggest that some mediators of allergic reactions previously associated, in man, only with antigen-IgE antibody interaction on mast cells or basophils may be released by other stimuli and from other cell types.[1]


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