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- W4313404842 abstract "Abstract Mast cell activation is critical for the development of allergic diseases. Ligation of Sialic acid-binding immunoglobin-like lectins (Siglecs) such as Siglec-7 and 8 has been shown to inhibit mast cell activation and is considered one of the main approaches to reduce mast cell contribution to allergic disease. Recent high throughput studies provided evidence that human mast cells express Siglec-9, an inhibitory receptor that is mainly expressed by innate immune cells such as neutrophils, monocytes and eosinophils. Based on this evidence, we aimed to examine Siglec-9 expression and function in human mast cells. Flow cytometry analysis showed that Siglec-9 is expressed in the human mast cell lines LAD2, LUVA, and HMC-1, and in peripheral blood-derived cultured human mast cells (PBCMCs). The expression of Siglec-9 in PBCMCs peaks at week 5 of culture and correlates positively with the expression of the high affinity receptor for IgE (FcɛRI). Pre-treatment of human mast cells with the Siglec-9 agonists glycophorin A or high molecular weight hyaluronic acid (HMW-HA) followed by FcɛRI-dependent stimulation has an inhibitory effect on mast cell degranulation. SIGLEC9 gene disruption by CRISPR/Cas9 editing resulted in a significant reduction in Siglec-9 expression in LAD2 cells that also became impervious to inhibition by Siglec-9 agonists. Together, our data shows that human mast cells express Siglec-9 and that engaging this inhibitory receptor can reduce mast cell degranulation." @default.
- W4313404842 created "2023-01-06" @default.
- W4313404842 creator A5010007331 @default.
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- W4313404842 date "2022-05-01" @default.
- W4313404842 modified "2023-09-30" @default.
- W4313404842 title "Ligation of Siglec-9 inhibits FcɛRI-dependent mediator release from human mast cells" @default.
- W4313404842 doi "https://doi.org/10.4049/jimmunol.208.supp.49.18" @default.
- W4313404842 hasPublicationYear "2022" @default.
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