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Delivery of Antibodies into the Brain Using Focused Scanning Ultrasound
Published on: July 18, 2020
Low Intensity Ultrasound-facilitated exosome delivery promotes hippocampal neurogenesis in Alzheimer's disease
Yudie Yan1, Jingtong Su2, Muyun Xie3
1Department of Ultrasound, Zhongshan Hospital of Fudan University, Shanghai, China; Department of Ultrasound, The First Hospital of China Medical University, Shenyang, Liaoning, China.
Background:
Low-intensity ultrasound (LIUS) and human adipose-tissue mesenchymal stem cell-derived exosomes (hADSC-Exos) have shown neuroprotective potential, but their combined effects in Alzheimer's disease (AD) remain unclear.
Objective:
To evaluate the safety and efficacy of intranasal hADSC-Exos alone or combined with LIUS in APP/PS1 mice, and explore underlying molecular mechanisms.
Methods:
Female APP/PS1 mice (30 weeks) were randomized into five groups (n = 6). Treatments included intranasal hADSC-Exos, LIUS, or both for 2 months. Behavioral tests, histology, and hippocampal RNA-seq were performed.
Results:
LIUS enhanced Exo uptake in HT22 cells by ∼8 % without toxicity. Combined treatment improved learning and memory (escape latency ↓45 s→20 s; P < 0.01), increased neurogenesis markers (GFAP/SOX2, DCX, Ki67), and reduced amyloid and microglial activation. RNA-seq identified 93 specific DEGs in the combination group, with enrichment in synaptic and mitochondrial pathways. Fos and Kcnj13 were top DEGs and both downregulated after therapy (P < 0.05).
Conclusions:
Intranasal hADSC-Exos combined with LIUS is safe, enhances brain delivery, and synergistically improves cognition and neurogenesis in AD mice. The Fos-Kcnj13 axis may mediate these effects, suggesting a promising noninvasive therapeutic strategy.
