Ultrasound-enhanced exosome secretion and antibody-free SERS profiling for Alzheimer's disease via iPSC-derived cortical organoids.

Ultrasound stimulation boosts exosome secretion by 2.5-fold and enables genotype-specific Alzheimer’s disease profiling via label-free SERS analysis of cortical organoid exosomes.

• Why it matters: Current exosome-based diagnostics struggle to detect subtle genotype-specific variations due to weak signals and reliance on markers, limiting early and precise diagnosis of neurodegenerative diseases like Alzheimer’s.
• What they did: The study optimized ultrasound parameters to enhance exosome secretion from iPSC-derived cortical organoids and used surface-enhanced Raman scattering (SERS) to profile exosomes without labels, identifying apolipoprotein E genotype differences.
• The result: This approach revealed distinct exosomal fingerprints linked to Alzheimer’s pathology, demonstrating a powerful, noninvasive method for precise, genotype-specific diagnosis and understanding of disease mechanisms.