Veverová, Kateřina; Laczó, Jan; Katonová, Alžběta; Horáková, Hana; Matušková, Veronika; Angelucci, Francesco; Laczó, Martina; Nedelská, Zuzana; Hort, Jakub; Wang, He-Ling; Zhang, Jianying; Shic, Liu; Fei Fang, Evandro; Vyhnálek, Martin. Autophagy. May 2024. IF: 14,6. doi
RNDr. Mgr. Kateřina Veverová, Ph.D., Department of Neurology, Second Faculty od Medicine and Motol University Hospital
Abstract
Defective mitophagy is consistently found in postmortem brain and iPSC-derived neurons from Alzheimer disease (AD) patients. However, there is a lack of extensive examination of mitophagy status in serum or cerebrospinal fluid (CSF), and the clinical potential of mitophagy biomarkers has not been tested. We quantified biomarkers of mitophagy/autophagy and lysosomal degradation (PINK1, BNIP3L and TFEB) in CSF and serum from 246 individuals, covering mild cognitive impairment due to AD (MCI-AD, n = 100), dementia due to AD (AD-dementia, n = 100), and cognitively unimpaired individuals (CU, n = 46), recruited from the Czech Brain Aging Study. Cognitive function and brain atrophy were also assessed. Our data show that serum and CSF PINK1 and serum BNIP3L were higher, and serum TFEB was lower in individuals with AD than in corresponding CU individuals. Additionally, the magnitude of mitophagy impairment correlated with the severity of clinical indicators in AD patients. Specifically, levels of PINK1 positively correlated with phosphorylated (p)-MAPT/tau (181), total (t)-MAPT/tau, NEFL (neurofilament light chain), and NRGN (neurogranin) levels in CSF and negatively with memory, executive function, and language domain. Serum TFEB levels negatively correlated with NEFL and positively with executive function and language. This study reveals mitophagy impairment reflected in biofluid biomarkers of individuals with AD and associated with more advanced AD pathology.
Keywords: Autophagy, BNIP3L, mild cognitive impairment, mitophagy, PINK1, TFEB.
