Basophil activation through ASGM1 stimulation triggers PAF release and anaphylaxis-like shock in mice.

Basophils have been shown to contribute to anaphylaxis through either an IgE-FcεRI-dependent pathway or an IgG-FcγR pathway. However, it remains largely unclear whether basophils can be activated to promote anaphylaxis via a non-FcR pathway as well. The glycolipid receptor ASGM1 (Asialoganglioside gangliotetraosylceramide), which has an exposed GalNAcβ1-4Gal moiety and serves as a receptor for pathogen associated molecular patterns such as flagellin, was recently found to be expressed on basophils. Here, we demonstrate that stimulation of basophils with anti-ASGM1 antibodies promotes platelet-activating factor (PAF) secretion in vitro and in vivo. Moreover, we found that ASGM1 stimulation triggers basophil- and PAF-dependent anaphylactic shock in pertussis toxin (PTX)-pretreated mice. Thus, ASGM1 has a crucial role in basophil activation and basophil-mediated anaphylaxis-like shock in mice, especially when the vascular permeability is increased by PTX treatment. Our findings describe a novel anaphylaxis-associated pathway that is antigen-, antibody-, and FcR-independent. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Citation

Yan Yang, Daling Li, Foad Katirai, Bin Zhang, Yong Xu, Ping Xiong, Feili Gong, Fang Zheng. Basophil activation through ASGM1 stimulation triggers PAF release and anaphylaxis-like shock in mice. European journal of immunology. 2014 Aug;44(8):2468-77

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PMID: 24777913

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