Publication Date:
2019
Description:
〈p〉Basophils have nonredundant roles in various immune responses that require Ca〈sup〉2+〈/sup〉 influx. Here, we examined the role of two Ca〈sup〉2+〈/sup〉 sensors, stromal interaction molecule 1 and 2 (STIM1 and STIM2), in basophil activation. We found that loss of STIM1, but not STIM2, impaired basophil IL-4 production after stimulation with immunoglobulin E (IgE)–containing immune complexes. In contrast, when basophils were stimulated with IL-3, loss of STIM2, but not STIM1, reduced basophil IL-4 production. This difference in STIM proteins was associated with distinct time courses of Ca〈sup〉2+〈/sup〉 influx and transcription of the 〈i〉Il4〈/i〉 gene that were elicited by each stimulus. Similarly, basophil-specific STIM1 expression was required for IgE-driven chronic allergic inflammation in vivo, whereas STIM2 was required for IL-4 production after combined IL-3 and IL-33 treatment in mice. These data indicate that STIM1 and STIM2 have differential roles in the production of IL-4, which are stimulus dependent. Furthermore, these results illustrate the vital role of STIM2 in basophils, which is often considered to be less important than STIM1.〈/p〉
Print ISSN:
1945-0877
Electronic ISSN:
1937-9145
Topics:
Biology
,
Medicine
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