The human sialic acid-binding immunoglobulin-like lectin Siglec-9 and its murine homolog Siglec-E control osteoclast activity and bone resorption

Andes FT, Adam S, Hahn M, Aust O, Frey S, Grüneboom A, Nitschke L, Schett G, Steffen U (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Bone Elsevier

Article Number: 115665

DOI: 10.1016/j.bone.2020.115665

Abstract

Regulation of osteoclast differentiation and function is a central element in bone homeostasis. While the role of soluble factors, such as cytokines, hormones and growth factors, in controlling osteoclast differentiation has been intensively characterized, the function of surface receptors is less well understood. Sialic acid-binding immunoglobulin-like lectin (Siglec)-9 and its murine homolog Siglec-E are sialic acid-recognizing inhibitory receptors from the CD33-related Siglec-family and mainly expressed on myeloid cells. We found Siglec-9 and Siglec-E to be expressed at all stages of human and murine osteoclastogenesis, respectively. Siglec-E knockout mice displayed lower bone mass despite unchanged osteoclast numbers and an increased bone formation rate. Ex vivo osteoclast assays using Siglec-E knockout cells or a blocking antibody against human Siglec-9 confirmed the suppressive effect of Siglec-9/Siglec-E on osteoclast function. Although osteoclast numbers were unchanged or even slightly decreased, the blockade/absence of Siglec-9/Siglec-E resulted in an augmented resorption activity of mature osteoclasts. This increased resorption activity was associated with enlarged actin rings. Together, our results suggest Siglec-9/Siglec-E to inhibit osteoclast activation independently from osteoclast differentiation and thereby propose a new mechanism for the control of local bone resorption.

Authors with CRIS profile

Susanne Adam Department of Medicine 3 – Rheumatology and Immunology Madelaine Hahn Professur für Genetik Silke Frey Department of Medicine 3 – Rheumatology and Immunology Lars Nitschke Professur für Genetik Georg Schett Lehrstuhl für Innere Medizin III Ulrike Steffen Department of Medicine 3 – Rheumatology and Immunology

How to cite

APA:

Andes, F.T., Adam, S., Hahn, M., Aust, O., Frey, S., Grüneboom, A.,... Steffen, U. (2020). The human sialic acid-binding immunoglobulin-like lectin Siglec-9 and its murine homolog Siglec-E control osteoclast activity and bone resorption. Bone. https://dx.doi.org/10.1016/j.bone.2020.115665

MLA:

Andes, F. T., et al. "The human sialic acid-binding immunoglobulin-like lectin Siglec-9 and its murine homolog Siglec-E control osteoclast activity and bone resorption." Bone (2020).

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