Open AccessAPP‐derived peptides reflect neurodegeneration in frontotemporal dementia
Author(s) -
IllánGala Ignacio,
Pegueroles Jordi,
Montal Victor,
Alcolea Daniel,
Vilaplana Eduard,
Bejanin Alexandre,
BorregoÉcija Sergi,
Sampedro Frederic,
Subirana Andrea,
SánchezSaudinós MaríaBelén,
RojasGarcía Ricard,
Vanderstichele Hugo,
Blesa Rafael,
Clarimón Jordi,
Antonell Anna,
Lladó Albert,
SánchezValle Raquel,
Fortea Juan,
Lleó Alberto
Publication year - 2019
Publication title -
annals of clinical and translational neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.824
H-Index - 42
ISSN - 2328-9503
DOI - 10.1002/acn3.50948
Subject(s) - frontotemporal lobar degeneration , cerebrospinal fluid , amyloid precursor protein , neurodegeneration , medicine , frontotemporal dementia , dementia , alzheimer's disease , neuroscience , pathology , disease , biology
Objective We aimed to investigate the relationship between cerebrospinal fluid levels (CSF) of amyloid precursor protein (APP)‐derived peptides related to the amyloidogenic pathway, cortical thickness, neuropsychological performance, and cortical gene expression profiles in frontotemporal lobar degeneration (FTLD)‐related syndromes, Alzheimer’s disease (AD), and healthy controls. Methods We included 214 participants with CSF available recruited at two centers: 93 with FTLD‐related syndromes, 57 patients with AD, and 64 healthy controls. CSF levels of amyloid β (Aβ)1‐42, Aβ1‐40, Aβ1‐38, and soluble β fragment of APP (sAPPβ) were centrally analyzed. We compared CSF levels of APP‐derived peptides between groups and, we studied the correlation between CSF biomarkers, cortical thickness, and domain‐specific cognitive composites in each group. Then, we explored the relationship between cortical thickness, CSF levels of APP‐derived peptides, and regional gene expression profile using a brain‐wide regional gene expression data in combination with gene set enrichment analysis. Results The CSF levels of Aβ1‐40, Aβ1‐38, and sAPPβ were lower in the FTLD‐related syndromes group than in the AD and healthy controls group. CSF levels of all APP‐derived peptides showed a positive correlation with cortical thickness and the executive cognitive composite in the FTLD‐related syndromes group but not in the healthy control or AD groups. In the cortical regions where we observed a significant association between cortical thickness and CSF levels of APP‐derived peptides, we found a reduced expression of genes related to synaptic function. Interpretation APP‐derived peptides in CSF may reflect FTLD‐related neurodegeneration. This observation has important implications as Aβ1‐42 levels are considered an indirect biomarker of cerebral amyloidosis.