Elevated cerebrospinal fluid levels of SERPIN E1 in participants with lewy body diseases.

Parkinson's disease (PD) exhibits substantial phenotypic variability, likely influenced, at least in part, by proteins associated with pathways integral to aging processes. Plasminogen activator inhibitor-1 (SERPIN E1) is known for its association with aging processes and exacerbated α-Synuclein pathology. We examined whether SERPIN E1 levels in cerebrospinal fluid (CSF) differ among controls (CON, N = 16) and patients with PD (N = 479) or Dementia with Lewy bodies (DLB, N = 67), considering that these conditions represent a spectrum of α-Synuclein pathology. Kaplan-Meier survival analysis stratified by SERPIN E1 tertile levels was conducted to evaluate phenotype-modifying effects. Elevated levels of SERPIN E1 exhibited an association with increased age and lower MOCA scores. Heightened SERPIN E1 levels were observed in individuals diagnosed with DLB, followed by PD and CON, and in males compared to females. The quantification of SERPIN E1 in CSF could potentially serve as a surrogate marker, depicting (pathological) aging processes.