SDC4 and Alzheimer disease: We assessed the accumulation of five matrisome proteins (MDK, SPOCK3, COL25aA1, SDC4, and EGFL8) across four brain regions differentially affected in AD (occipital cortex, hippocampus, striatum, and cerebellum), and examined their association with Aβ plaques, CAA, tau neurites, and neurofibrillary tangles (NFT).