Journal Article

APP lysine 612 lactylation ameliorates amyloid pathology and memory decline in Alzheimer’s disease

Yi, Lilin, Fan, Yepeng, Xiao, Qian, Pang, Yayan, He, Wenting, Tian, Qiuyun, Tian, Na, Tao, Yuhan, Li, Junjie, Du, Yehong, Wu, Bin, Wang, Jiaojiao, Shi, Xiuyu, Dong, Zhifang, Tian, Xin, Xia, Lei, Chen, Mulan, Xu, Boqing, Song, Weihong

2025

Overview

Posttranslational modification (PTM) of the amyloid precursor protein (APP) plays a critical role in Alzheimer's disease (AD). Recent evidence reveals that lactylation modification, as a novel PTM, is implicated in the occurrence and development of AD. However, whether and how APP lactylation contributes to both the pathogenesis and cognitive function in AD remains unknown. Here, we observed a reduction in APP lactylation in AD patients and AD model mice and cells. Proteomic mass spectrometry analysis further identified lysine 612 (APP-K612la) as a crucial site for APP lactylation, influencing APP amyloidogenic processing. A lactyl-mimicking mutant (APPK612T) reduced amyloid-β peptide (Aβ) generation and slowed down cognitive deficits in vivo. Mechanistically, APPK612T appeared to facilitate APP trafficking and metabolism. However, lactylated APP entering the endosome inhibited its binding to BACE1, suppressing subsequent cleavage. Instead, it promoted protein interaction between APP and CD2-associated protein (CD2AP), thereby accelerating the endosomal-lysosomal degradation pathway of APP. In the APP23/PS45 double-transgenic mouse model of AD, APP-Kla was susceptible to L-lactate regulation, which reduced Aβ pathology and repaired spatial learning and memory deficits. Thus, these findings suggest that targeting APP lactylation may be a promising therapeutic strategy for AD in humans.

• Publisher: American Society for Clinical Investigation
• Subject: Aging / Alzheimer Disease - genetics / Alzheimer Disease - metabolism / Alzheimer Disease - pathology / Alzheimer's disease / Amino Acid Substitution / Amyloid beta-Peptides - genetics / Amyloid beta-Peptides - metabolism / Amyloid beta-protein / Amyloid beta-Protein Precursor - genetics / Amyloid beta-Protein Precursor - metabolism / Amyloid Precursor Protein Secretases - genetics / Amyloid Precursor Protein Secretases - metabolism / Analysis / Animals / Aspartic Acid Endopeptidases - genetics / Aspartic Acid Endopeptidases - metabolism / Care and treatment / Development and progression / Disease Models, Animal / Health aspects / Humans / Lactates / Lysine / Lysine - metabolism / Male / Memory Disorders - genetics / Memory Disorders - metabolism / Mice / Mice, Transgenic / Mutation, Missense / Neuroscience / Protein Processing, Post-Translational / Risk factors