PAAS (plaque-associated axonal spheroid(s)) are dystrophic structures that sprout from axons that pass through amyloid beta plaques. If small enough they do not interfere with action potential (AP) propagation. Medium sized ones delay APs, and large, or many spheroids can block single APs and block or delay trains of APs.
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Yuan P, Zhang M, Tong L, Morse TM, McDougal RA, Ding H, Chan D, Cai Y, Grutzendler J PLD3 affects axonal spheroids and network defects in Alzheimer's disease Nature . [PubMed]
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