Rat Anti-Mouse Siglec-H Antibody (S-3779)

Siglec-H is a sialic acid-binding Ig-like lectin expressed almost exclusively on murine plasmacytoid dendritic cells (pDCs) and microglia, where it partners with the ITAM-bearing adaptor DAP12 to deliver inhibitory signals that restrain type I interferon (IFN-α) secretion, limits TLR7/9-mediated viral responses, and thereby prevents overt systemic autoimmunity while still permitting antigen uptake and presentation; genetic deletion or antibody-mediated ligation of Siglec-H heightens IFN-α output, skews T-cell polarization toward IL-21⁺ CD4 subsets, and can either exacerbate or attenuate inflammatory diseases depending on context, making it a key rheostat of innate–adaptive immune crosstalk.