Exosome of plasma and CSF from AD patients

Exosome fractions were purified from plasma or spinal fluid collected from Alzheimer's disease patients using MagCapture. Elution of exosomes bound to affinity beads was performed with 1% SDS. Proteins were precipitated from the exosome fraction by acetone precipitation; the precipitates were dissolved in 50% trifluoroethanol and subjected to reduction with DTT and alkylation reaction with iodoacetamide. The proteins were degraded by trypsin/Lys-C, and the peptides produced were desalted and purified using MonoSpinC18. The peptides were measured by LC-MS/MS and quantified by non-label quantification method. The peak area values of peptide-proteins for each sample were normalized to the total peak area.