Targeting phagocytosis for amyloid-β clearance: implications of morphology remodeling and microglia activation probed by bifunctional chimaeras

作者：Youqiao Wang, Zeyi Wang, Ziyi Liu, Jinyan Li, Shuo Yang, Yuxuan Zhao, Yangmei Huang, C. Y. Liao, Y Zhang, Jiaojiao Zhao, Weilin Zhou, Binhua P. Zhou, Xin Yue, Qiang Zhou, Xianzhang Bu · 发表于：Nature Communications · 年份：2025 · DOI：10.1038/s41467-025-63458-3 · 被引用次数：7 · 研究领域：Alzheimer's disease research and treatments、Neuroinflammation and Neurodegeneration Mechanisms、Nuclear Receptors and Signaling

Amyloid-β (Aβ), a key driver of Alzheimer's disease (AD) pathogenesis, possesses diverse harmful and clearance-resistant structures that present substantial challenges to therapeutic development. Here, we demonstrate that modulating Aβ morphology, rather than Toll-like receptor 2 (TLR2)-dependent microglia activation, is essential for effective phagocytosis of Aβ species by microglia. By developing a bifunctional mechanistic probe (P2CSKn) designed to remodel Aβ and activate TLR2, we show it restructures soluble Aβ (sAβ) and fibrillar Aβ (fAβ) into less toxic hybrid aggregates (hPAβ). Critically, this structural remodeling protects microglia from Aβ toxicity while enabling robust phagocytosis. Moreover, although TLR2 activation mildly enhances Aβ uptake, it concurrently triggers detrimental inflammation that negates its benefits. Our findings establish morphological remodeling as the critical determinant of effective Aβ clearance and suggest a morphology-focused strategy for developing safe therapeutics for Aβ-related diseases.