Figure 4.
Siglecs regulate microglial phagocytosis. Wild-type microglia express a low level of CD33/Siglec 3, a member of the Siglec family. The risk allele rs3865444 was originally identified in patients with Alzheimer’s disease (AD) and is associated with higher levels of CD33 that suppress the microglial phagocytosis. Conversely, knockdown of CD33 significantly improves the phagocytosis capability of microglia (Hollingworth et al., 2011; Naj et al., 2011; Griciuc et al., 2013). Aβ, amyloid β.
