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Claude, Janine; Linnartz-Gerlach, Bettina; Kudin, Alexei P; Kunz, Wolfram S; Neumann, Harald
The Journal of neuroscience, 11/2013, Letnik: 33, Številka: 46Journal Article
Sialic acid-binding Ig-like lectins (Siglecs) are members of the Ig superfamily that recognize sialic acid residues of glycoproteins. Siglec-E is a mouse CD33-related Siglec that preferentially binds to sialic acid residues of the cellular glycocalyx. Here, we demonstrate gene transcription and protein expression of Siglec-E by cultured mouse microglia. Siglec-E on microglia inhibited phagocytosis of neural debris and prevented the production of superoxide radicals induced by challenge with neural debris. Soluble extracellular Siglec-E receptor protein bound to the neural glycocalyx. Coculture of mouse microglia and neurons demonstrated a neuroprotective effect of microglial Siglec-E that was dependent on neuronal sialic acid residues. Increased neurotoxicity of microglia after knockdown of Siglece mRNA was neutralized by the reactive oxygen species scavenger Trolox. Data suggest that Siglec-E recognizes the intact neuronal glycocalyx and has neuroprotective function by preventing phagocytosis and the associated oxidative burst.
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