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Sialic acid binding immunoglobulin-like lectins may regulate innate immune responses by modulating the life span of granulocytes

Department of Pharmacology, University of Bern, Bern, Switzerland

¹Correspondence: Department of Pharmacology, University of Bern, Friedbühlstrasse 49, CH-3010 Bern, Switzerland. E-mail: hus{at}pki.unibe.ch

ABSTRACT

The regulation of cell death is a key element in building up and maintaining both innate and adaptive immunity. A critical role in this process plays the tumor necrosis factor (TNF)/nerve growth factor (NGF) receptor family of death receptors. Recent work suggests that sialic acid binding immunoglobulin (Ig) -like lectins (Siglecs) are also empowered to transmit death signals, at least into myeloid cells. Strikingly, death induction by Siglecs is enhanced when cells are exposed to proinflammatory survival cytokines. Based on these recent insights, we hypothesize that at least some members of the Siglec family regulate immune responses via the activation of caspase-dependent and caspase-independent cell death pathways.—von Gunten, S., Simon, H.-U. Sialic acid binding immunoglobulin-like lectins (Siglecs) may regulate innate immune responses by modulating the life span of granulocytes.

Key Words: apoptosis • caspases • eosinophils • inflammation • neutrophils • non-apoptotic cell death • Siglecs

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