Molecular and Cellular Biochemistry

, Volume 326, Issue 1, pp 55–66

The role of α-synuclein in brain lipid metabolism: a downstream impact on brain inflammatory response

  • Mikhail Y. Golovko
  • Gwendolyn Barceló-Coblijn
  • Paula I. Castagnet
  • Susan Austin
  • Colin K. Combs
  • Eric J. Murphy
Article

DOI: 10.1007/s11010-008-0008-y

Cite this article as:
Golovko, M.Y., Barceló-Coblijn, G., Castagnet, P.I. et al. Mol Cell Biochem (2009) 326: 55. doi:10.1007/s11010-008-0008-y

Abstract

α-Synuclein (Snca) is an abundant small cytosolic protein (140 amino acids) that is expressed in the brain, although its physiological role is poorly defined. Consistent with its ubiquitous distribution in the brain, we and others have established a role for Snca in brain lipid metabolism and downstream events such as neuroinflammation. In astrocytes, Snca is important for fatty acid uptake and trafficking, where its deletion decreases 16:0 and 20:4n-6 uptake and alters targeting to specific lipid pools. Although Snca has no impact on 22:6n-3 uptake into astrocytes, it is important for its targeting to lipid pools. Similar results for fatty acid uptake from the plasma are seen in studies using whole mice coupled with steady-state kinetic modeling. We demonstrate in gene-ablated mice a significant reduction in the incorporation rate of 20:4n-6 into brain phospholipid pools due to reduced recycling of 20:4n-6 through the ER-localized long-chain acyl-CoA synthetases (Acsl). This reduction results in a compensatory increase in the incorporation rate of 22:6n-3 into brain phospholipids. Snca is also important for brain and astrocyte cholesterol metabolism, where its deletion results in an elevation of cholesterol and cholesteryl esters. This increase may be due to the interaction of Snca with membrane-bound enzymes involved in lipid metabolism such as Acsl. Snca is critical in modulating brain prostanoid formation and microglial activities. In the absence of Snca, microglia are basally activated and demonstrate increased proinflammatory cytokine secretion. Thus, Snca, through its modulation of brain lipid metabolism, has a critical role in brain inflammatory responses.

Keywords

Acyl-CoA synthetaseα-SynucleinArachidonic acidCholesterolCholesteryl estersDocosahexaenoic acidFatty acid metabolismPalmitic acidTriacylglycerol

Copyright information

© Springer Science+Business Media, LLC. 2008

Authors and Affiliations

  • Mikhail Y. Golovko
    • 1
  • Gwendolyn Barceló-Coblijn
    • 1
    • 2
  • Paula I. Castagnet
    • 1
    • 3
  • Susan Austin
    • 1
  • Colin K. Combs
    • 1
  • Eric J. Murphy
    • 1
    • 4
  1. 1.Department of Pharmacology, Physiology, and Therapeutics, School of Medicine and Health SciencesUniversity of North DakotaGrand ForksUSA
  2. 2.Department of BiologyUniversity of the Balearic IslandsPalmaSpain
  3. 3.Department of BiologyAve Maria UniversityAve MariaUSA
  4. 4.Department of ChemistryUniversity of North DakotaGrand ForksUSA