Fig. 5

Schematic interlinking of the effect of β2M based microglia-astrocyte communication on AD pathology. CSF β2M is mainly derived from activated microglia (also secretes sTREM2) and peripheral β2M across the blood–brain barrier. β2M may be involved in Aβ aggregation. Findings in the present study suggest that CSF β2M also upregulates the secretion of GFAP by reactive astrocytes to promote the increase of P-tau and T-tau. Abbreviations: Alzheimer's disease, AD; CSF, cerebrospinal fluid; β2M, β2-microglobulin; Aβ, amyloid-β; P-tau, phosphorylated-tau; T-tau, total-tau; GFAP, glial fibrillary acidic protein; sTREM2, soluble triggering receptor expressed on myeloid cells 2