CSF N-acylethanolamine acid amidase level and Parkinson's disease risk: A mendelian randomization study.

BACKGROUND: Neuroinflammation is involved in the progression of Parkinson's disease (PD), and N-acylethanolamine acid amidase (NAAA) is involved in regulating inflammation by hydrolyzing bioactive lipid mediators called N-acylethanolamines (NAEs). However, the causal relationship between cerebrospinal fluid (CSF) NAAA protein levels and the risk of PD remains unclear. This study aimed to explore the causal effect of CSF NAAA levels on PD risk through Mendelian randomization (MR) analysis. METHOD: Genome-wide association study (GWAS) summary statistics for CSF NAAA protein quantitative trait loci (pQTL) and GWAS summary statistics for PD were obtained from publicly available databases. Inverse-variance weighted (IVW) was the main causal estimation method for MR analysis. In addition, the maximum likelihood, MR Egger regression, and weighted median were used to supplement the IVW results. Finally, various sensitivity tests were performed to verify the reliability of the MR findings. RESULTS: In the initial MR analysis, the IVW showed that CSF NAAA protein levels significantly increased PD risk (odds ratio [OR] = 1.17, 95% confidence interval [CI]: 1.01-1.35, P = 0.031). This finding was further validated in a replicate MR analysis (OR = 1.20, 95% CI: 1.02-1.41, P = 0.027). Sensitivity analysis showed that MR results were stable and not affected by heterogeneity and horizontal pleiotropy. CONCLUSION: The present MR study supports a causal relationship between elevated CSF NAAA protein levels and increased PD risk.

Neurologic symptoms of biotinidase deficiency: possible explanation.

We found that the activity of biotinidase is much lower in human and rat brain or human CSF than in serum or other tissues that have biotin-dependent carboxylase activity. The brain seems to be unable to recycle biotin and depends on biotin transferred across the blood-brain barrier. The biotin-deficient state that results from an inherited lack of biotinidase results in a moderate decrease in brain pyruvate carboxylase activity. This is followed by more severe accumulation of lactate in brain than in other organs, which may explain why affected children have neurologic symptoms before many peripheral features.

Astatine-211-labeled biotin conjugates resistant to biotinidase for use in pretargeted radioimmunotherapy.

We report herein the preparation and biological evaluation of two radioastatinated biotin conjugates, (3-[211At]astatobenzoyl)norbiotinamide and ((5-[211At]astato-3-pyridinyl)carbonyl)norbiotinamide. Both conjugates were stable in the presence of human serum and cerebrospinal fluid as well as murine serum, indicating a resistance to degradation to biotinidase. The normal tissue clearance of (3-[211At]astatobenzoyl)norbiotinamide and ((5-[211At]astato-3-pyridinyl)carbonyl)norbiotinamide was rapid, as observed previously with their iodo analogues. Also reported are the first syntheses of N-succinimidyl 5-[211At]astato-3-pyridinecarboxylate and 3-[211At]astatoaniline, two reagents of potential utility for labeling proteins and peptides with 211At.

Changes in cerebrospinal fluid biotinidase activity in Staphylococcus aureus meningitis.

An early increase in activity of biotinidase in the cerebrospinal fluid (CSF) during the course of acute Staphylococcus aureus meningitis in a subject with subacute sclerosing panencephalitis (SSPE) is reported. A possible role of CSF biotinidase in the hydrolysis of specific opioid neuropeptides during acute inflammatory processes involving the CSF-central nervous system compartment is suggested.