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Aim. Peroxisomes play a key role in lipid metabolism, and peroxisome defects have been associated with neurodegenerative diseases such as X-adrenoleukodystrophy and Alzheimer's disease. This study aims to elucidate the contribution of peroxisomes in lipid alterations of area 8 of the frontal cortex in the spectrum of TDP43-proteinopathies. Cases of frontotemporal lobar degeneration-TDP43 (FTLD-TDP), manifested as sporadic (sFTLD-TDP) or linked to mutations in various genes including expansions of the non-coding region of C9ORF72 (c9FTLD), and of sporadic amyotrophic lateral sclerosis (sALS) as the most common TDP43 proteinopathies, were analysed. Methods. We used transcriptomics and lipidomics methods to define the steady-state levels of gene expression and lipid profiles. Results. Our results show alterations in gene expression of some components of peroxisomes and related lipid pathways in frontal cortex area 8 in sALS, sFTLD-TDP and c9FTLD. Additionally, we identify a lipidomic pattern associated with the ALS-FTLD-TDP43 proteinopathy spectrum, notably characterised by down-regulation of ether lipids and acylcarnitine among other lipid species, as well as alterations in the lipidome of each phenotype of TDP43 proteinopathy, which reveals commonalities and disease-dependent differences in lipid composition. Conclusion. Globally, lipid alterations in the human frontal cortex of the ALS-FTLD-TDP43 proteinopathy spectrum, which involve cell membrane composition and signalling, vulnerability against cellular stress and possible glucose metabolism, are partly related to peroxisome impairment. ; Research by the authors was supported by the Spanish Ministry of Economy and Competitiveness, Institute of Health Carlos III (PI 17–00134) to M.P-O; the Spanish Ministry of Economy and Competitiveness, Institute of Health Carlos III (FIS grants FISPI17/000809) to IF; and by the Spanish Ministry of Science, Innovation, and Universities (Ministerio de Ciencia, Innovación y Universidades, RTI2018-099200-BI00) and the Generalitat of Catalonia: Agency for Management of University and Research Grants (2017SGR696) and Department of Health (SLT002/16/00250) to RP. This study was co-financed by FEDER funds from the European Union ("A way to build Europe"). Support was also received in the form of a FUNDELA Grant, RedELA-Plataforma Investigación and the Fundació Miquel Valls (Jack Van den Hoek donation). IRBLleida and IDIBELL are CERCA Programmes of the Generalitat of Catalonia.