Ligation of Siglec-8: A selective mechanism for induction of human eosinophil apoptosis

Esra Nutku, Hideyuki Aizawa, Sherry A. Hudson, Bruce S. Bochner

Research output: Contribution to journalArticle

Abstract

Sialic acid binding immunoglobulin-like lectin 8 (Siglec-8), which exists in 2 isoforms including one possessing cytoplasmic tyrosine motifs, is expressed only on human eosinophils, basophils, and mast cells. Until now, its function was unknown. Here we define a novel function of Siglec-8 on eosinophils. Siglec-8 crosslinking with antibodies rapidly generated caspase-3-like activity and reduced eosinophil viability through induction of apoptosis. The pancaspase inhibitor benzyloxycarbonyl (Cbz)-Val-Ala-Asp-(Ome)-fluoromethyl ketone (zVAD-FMK) completely blocked this response, implicating caspases in Siglec-8 cross-linking-induced apoptosis. Eosinophil survival-promoting cytokines such as interleukin 5 (IL-5) and granulocyte-macrophage colonystimulating factor (GM-CSF) failed to block apoptosis and instead enhanced the sensitivity of eosinophils to undergo apoptosis in response to Siglec-8 antibody. Siglec-8 activation may provide a useful therapeutic approach to reduce numbers of eosinophils (and perhaps basophils and mast cells) in disease states where these cells are important.

Original languageEnglish (US)
Pages (from-to)5014-5020
Number of pages7
JournalBlood
Volume101
Issue number12
StatePublished - Jun 15 2003
Externally publishedYes

Fingerprint

Sialic Acid Binding Immunoglobulin-like Lectins
Eosinophils
Ligation
Apoptosis
Basophils
Mastocytosis
Antibodies
Macrophages
Interleukin-5
Caspases
Ketones
Granulocytes
Mast Cells
Caspase 3
Crosslinking
Tyrosine
Protein Isoforms
Chemical activation
Cytokines

ASJC Scopus subject areas

  • Hematology

Cite this

Nutku, E., Aizawa, H., Hudson, S. A., & Bochner, B. S. (2003). Ligation of Siglec-8: A selective mechanism for induction of human eosinophil apoptosis. Blood, 101(12), 5014-5020.

Ligation of Siglec-8 : A selective mechanism for induction of human eosinophil apoptosis. / Nutku, Esra; Aizawa, Hideyuki; Hudson, Sherry A.; Bochner, Bruce S.

In: Blood, Vol. 101, No. 12, 15.06.2003, p. 5014-5020.

Research output: Contribution to journalArticle

Nutku, E, Aizawa, H, Hudson, SA & Bochner, BS 2003, 'Ligation of Siglec-8: A selective mechanism for induction of human eosinophil apoptosis', Blood, vol. 101, no. 12, pp. 5014-5020.
Nutku E, Aizawa H, Hudson SA, Bochner BS. Ligation of Siglec-8: A selective mechanism for induction of human eosinophil apoptosis. Blood. 2003 Jun 15;101(12):5014-5020.
Nutku, Esra ; Aizawa, Hideyuki ; Hudson, Sherry A. ; Bochner, Bruce S. / Ligation of Siglec-8 : A selective mechanism for induction of human eosinophil apoptosis. In: Blood. 2003 ; Vol. 101, No. 12. pp. 5014-5020.
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