Human LilrB2 Is a β-Amyloid Receptor and Its Murine Homolog PirB Regulates Synaptic Plasticity in an Alzheimer’s Model

Amyloid Binding Partners Amyloid-β (Aβ) is critical to the pathology of Alzheimer's disease (AD), but its role in normal physiology remains unclear. Kim et al. (p. 1399; see the Perspective by Benilova and De Strooper) found that murine-paired immunoglobulin-like receptor B (PirB) and its human ortholog, leukocyte immunoglobulin-like receptor B2 (LilrB2) both bound to oligomerized Aβ. Early in mouse development, ocular dominance plasticity was affected by interactions between oligomeric Aβ and PirB. In hippocampal brain slices from a mouse model of AD, reductions in long-term potentiation induced by Aβ required PirB. Furthermore, the memory defects characteristic of a mouse model of AD were dependent on function of PirB. Many binding partners for Aβ have been identified, and so the extent to which these findings can be exploited therapeutically remains unclear. A potential β-amyloid receptor in neurons regulates ocular dominance in mouse brain development. [Also see Perspective by Benilova and De Strooper] Soluble β-amyloid (Aβ) oligomers impair synaptic plasticity and cause synaptic loss associated with Alzheimer’s disease (AD). We report that murine PirB (paired immunoglobulin-like receptor B) and its human ortholog LilrB2 (leukocyte immunoglobulin-like receptor B2), present in human brain, are receptors for Aβ oligomers, with nanomolar affinity. The first two extracellular immunoglobulin (Ig) domains of PirB and LilrB2 mediate this interaction, leading to enhanced cofilin signaling, also seen in human AD brains. In mice, the deleterious effect of Aβ oligomers on hippocampal long-term potentiation required PirB, and in a transgenic model of AD, PirB not only contributed to memory deficits present in adult mice, but also mediated loss of synaptic plasticity in juvenile visual cortex. These findings imply that LilrB2 contributes to human AD neuropathology and suggest therapeutic uses of blocking LilrB2 function.

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