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dc.contributor.authorPuigdellívol, Mar
dc.contributor.authorAllendorf, David H.
dc.contributor.authorBrown, Guy C.
dc.date.accessioned2020-06-23T06:02:42Z
dc.date.available2020-06-23T06:02:42Z
dc.date.issued2020-06-09
dc.date.submitted2020-03-29
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/307126
dc.description.abstractMicroglia are brain macrophages that mediate neuroinflammation and contribute to and protect against neurodegeneration. The terminal sugar residue of all glycoproteins and glycolipids on the surface of mammalian cells is normally sialic acid, and addition of this negatively charged residue is known as “sialylation,” whereas removal by sialidases is known as “desialylation.” High sialylation of the neuronal cell surface inhibits microglial phagocytosis of such neurons, via: (i) activating sialic acid receptors (Siglecs) on microglia that inhibit phagocytosis and (ii) inhibiting binding of opsonins C1q, C3, and galectin-3. Microglial sialylation inhibits inflammatory activation of microglia via: (i) activating Siglec receptors CD22 and CD33 on microglia that inhibit phagocytosis and (ii) inhibiting Toll-like receptor 4 (TLR4), complement receptor 3 (CR3), and other microglial receptors. When activated, microglia release a sialidase activity that desialylates both microglia and neurons, activating the microglia and rendering the neurons susceptible to phagocytosis. Activated microglia also release galectin-3 (Gal-3), which: (i) further activates microglia via binding to TLR4 and TREM2, (ii) binds to desialylated neurons opsonizing them for phagocytosis via Mer tyrosine kinase, and (iii) promotes Aβ aggregation and toxicity in vivo. Gal-3 and desialylation may increase in a variety of brain pathologies. Thus, Gal-3 and sialidases are potential treatment targets to prevent neuroinflammation and neurodegeneration.
dc.languageen
dc.publisherFrontiers Media S.A.
dc.rightsAttribution 4.0 International (CC BY 4.0)en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectNeuroscience
dc.subjectsialic acid
dc.subjectdesialylation
dc.subjectgalectin-3
dc.subjectphagocytosis
dc.subjectmicroglia
dc.subjectneurodegeneration
dc.subjectaging
dc.titleSialylation and Galectin-3 in Microglia-Mediated Neuroinflammation and Neurodegeneration
dc.typeArticle
dc.date.updated2020-06-23T06:02:41Z
prism.publicationNameFrontiers in Cellular Neuroscience
prism.volume14
dc.identifier.doi10.17863/CAM.54219
dcterms.dateAccepted2020-05-15
rioxxterms.versionofrecord10.3389/fncel.2020.00162
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.identifier.eissn1662-5102


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Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's licence is described as Attribution 4.0 International (CC BY 4.0)