Characterization of a novel mouse strain expressing human Siglec-8 only on eosinophils

Jeremy A. O'Sullivan, Yadong Wei, Daniela J. Carroll, Liliana Moreno-Vinasco, Yun Cao, Fengrui Zhang, James J. Lee, Zhou Zhu, Bruce S. Bochner

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Sialic acid-binding immunoglobulin-like lectin (Siglec)-8 is a human cell surface protein expressed exclusively on eosinophils, mast cells, and basophils that, when engaged, induces eosinophil apoptosis and inhibits mast cell mediator release. This makes Siglec-8 a promising therapeutic target to treat diseases involving these cell types. However, preclinical studies of Siglec-8 targeting in vivo are lacking because this protein is only found in humans, apes, and some monkeys. Therefore, we have developed a mouse strain in which SIGLEC8 transcription is activated by Cre recombinase and have crossed this mouse with the eoCre mouse to achieve eosinophil-specific expression. We confirmed that Siglec-8 is expressed exclusively on the surface of mature eosinophils in multiple tissues at levels comparable to those on human blood eosinophils. Following ovalbumin sensitization and airway challenge, Siglec-8 knock-in mice generated a pattern of allergic lung inflammation indistinguishable from that of littermate controls, suggesting that Siglec-8 expression within the eosinophil compartment does not alter allergic eosinophilic inflammation. Using bone marrow from these mice, we demonstrated that, during maturation, Siglec-8 expression occurs well before the late eosinophil developmental marker C-C motif chemokine receptor 3, consistent with eoCre expression. Antibody ligation of the receptor induces Siglec-8 endocytosis and alters the phosphotyrosine profile of these cells, indicative of productive signaling. Finally, we demonstrated that mouse eosinophils expressing Siglec-8 undergo cell death when the receptor is engaged, further evidence that Siglec-8 is functional on these cells. These mice should prove useful to investigate Siglec-8 biology and targeting in vivo in a variety of eosinophilic disease models.

Original languageEnglish (US)
JournalJournal of Leukocyte Biology
DOIs
StateAccepted/In press - Jan 1 2018

Keywords

  • Apoptosis
  • Asthma
  • Knock-in
  • Pre-clinical
  • Siglec-F
  • Transgenic

ASJC Scopus subject areas

  • Immunology
  • Cell Biology

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    O'Sullivan, J. A., Wei, Y., Carroll, D. J., Moreno-Vinasco, L., Cao, Y., Zhang, F., Lee, J. J., Zhu, Z., & Bochner, B. S. (Accepted/In press). Characterization of a novel mouse strain expressing human Siglec-8 only on eosinophils. Journal of Leukocyte Biology. https://doi.org/10.1002/JLB.2HI0917-391R