Neuropathy Target Esterase Mechanisms in Neurodegenerative Disorders

Neuropathy target esterase (NTE) is a membrane‐associated serine hydrolase with critical roles in phospholipid turnover and neuronal integrity. Localised primarily to the endoplasmic reticulum, NTE catalyses the deacylation of phosphatidylcholine and lysophosphatidylcholine to glycerophosphocholine, thereby maintaining lipid homeostasis. Inhibition or mutation of NTE impairs membrane composition and signalling, leading to axonal degeneration, spastic paraplegia, ataxia and retinal dystrophy. Exposure to certain organophosphorus compounds can irreversibly inhibit NTE, triggering organophosphate‐induced delayed neuropathy. Genetic variants in PNPLA6, the gene encoding NTE, underlie a spectrum of inherited neurodegenerative syndromes, while experimental models in Drosophila and mice have elucidated links between disrupted lipid metabolism and progressive neuronal loss. Emerging evidence connects NTE dysfunction to both environmental toxicants and endogenous genetic mutations, highlighting its centrality in diverse neurodegenerative pathways and its potential as a therapeutic target.

Research from Nature Portfolio

Seminal work on inherited PNPLA6 mutations revealed that loss of enzymatic activity in photoreceptors elevates lysophosphatidylcholine levels, precipitating cell death and early‐onset blindness. These studies demonstrated that PNPLA6 variants compromise phospholipid metabolism, suggesting that modulation of lipid species may attenuate photoreceptor degeneration. Complementary investigations into organophosphate‐induced delayed neuropathy have uncovered that inhibition of NTE by tri‐o‐cresyl phosphate disrupts endoplasmic reticulum phospholipid balance. Detailed lipidomic profiling in animal models showed accumulations of phosphatidylcholine and sphingomyelin alongside depletions of glycerophosphocholine, diacylglycerol and phosphatidic acid, implicating disturbed phospholipid dynamics in the initiation of axonal pathology.

Neuropathy Target Esterase Mechanisms in Neurodegenerative Disorders publication trend

The graph below shows the total number of articles in neuropathy target esterase mechanisms in neurodegenerative disorders across all publications each year (not limited to Nature Index journals).

Technical terms

Neuropathy target esterase (NTE): A serine hydrolase catalysing deacylation of phospholipids, essential for membrane lipid homeostasis and neuronal survival.

Phosphatidylcholine (PC): A major membrane phospholipid substrate of NTE, whose turnover regulates membrane fluidity and signalling.

Lysophosphatidylcholine (LPC): A lipid intermediate generated by partial deacylation of phosphatidylcholine, further hydrolysed by NTE to glycerophosphocholine.

Organophosphate‐induced delayed neuropathy (OPIDN): A neurodegenerative syndrome initiated by irreversible inhibition of NTE by certain organophosphorus compounds, leading to axonal degeneration.

Deacylation: The enzymatic removal of fatty acid chains from phospholipids, a key step in phospholipid turnover mediated by NTE.

References

1. Human Neuropathy Target Esterase Catalyzes Hydrolysis of Membrane Lipids*. Journal of Biological Chemistry (2002).
2. Neuropathy Target Esterase and Its Yeast Homologue Degrade Phosphatidylcholine to Glycerophosphocholine in Living Cells*. Journal of Biological Chemistry (2004).
3. Protein Domains, Catalytic Activity, and Subcellular Distribution of Neuropathy Target Esterase in Mammalian Cells*. Journal of Biological Chemistry (2003).
4. Disturbed phospholipid homeostasis in endoplasmic reticulum initiates tri-o-cresyl phosphate-induced delayed neurotoxicity. Scientific Reports (2016).
5. Disease-Associated PNPLA6 Mutations Maintain Partial Functions When Analyzed in Drosophila. Frontiers in Neuroscience (2019).
6. Computational Modeling Study of the Binding of Aging and Non-Aging Inhibitors with Neuropathy Target Esterase. Molecules (2023).
7. Mutations in PNPLA6 are linked to photoreceptor degeneration and various forms of childhood blindness. Nature Communications (2015).
8. PNPLA6/NTE, an Evolutionary Conserved Phospholipase Linked to a Group of Complex Human Diseases. Metabolites (2022).