The Bidirectional Interplay of a-Synuclein with Lipids in the Central Nervous System and Its Implications for the Pathogenesis of Parkinson's Disease

The alteration and aggregation of alpha-synuclein (a-syn) play a crucial role in neurodegenerative diseases collectively termed as synucleinopathies, including Parkinson's disease (PD). The bidirectional interaction of a-syn with lipids and biomembranes impacts not only a-syn aggregation but also lipid homeostasis. Indeed, lipid composition and metabolism are severely perturbed in PD. One explanation for lipid-associated alterations may involve structural changes in a-syn, caused, for example, by missense mutations in the lipid-binding region of a-syn as well as post-translational modifications such as phosphorylation, acetylation, nitration, ubiquitination, truncation, glycosylation, and glycation. Notably, different strategies targeting the a-syn-lipid interaction have been identified and are able to reduce a-syn pathology. These approaches include the modulation of post-translational modifications aiming to reduce the aggregation of a-syn and modify its binding properties to lipid membranes. Furthermore, targeting enzymes involved in various steps of lipid metabolism and exploring the neuroprotective potential of lipids themselves have emerged as novel therapeutic approaches. Taken together, this review focuses on the bidirectional crosstalk of a-syn and lipids and how alterations of this interaction affect PD and thereby open a window for therapeutic interventions.