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Sci Rep. 2018 Oct 12;8(1):15207. doi: 10.1038/s41598-018-33474-z.

Lipid-dependent deposition of alpha-synuclein and Tau on neuronal Secretogranin II-positive vesicular membranes with age.

Author information

1
Neuroregeneration Institute, McLean Hospital/Harvard Medical School, Belmont, MA, 02478, USA.
2
Neuroregeneration Institute, McLean Hospital/Harvard Medical School, Belmont, MA, 02478, USA. ole_isacson@hms.harvard.edu.
3
Neuroregeneration Institute, McLean Hospital/Harvard Medical School, Belmont, MA, 02478, USA. phallett@mclean.harvard.edu.

Abstract

This report demonstrates insoluble alpha-synuclein (aSYN)+ aggregates in human sporadic Parkinson's disease (PD) midbrain that are linearly correlated with loss of glucocerebrosidase (GCase) activity. To identify early protein-lipid interactions that coincide with loss of lipid homeostasis, an aging study was carried out in mice with age-dependent reductions in GCase function. The analysis identified aberrant lipid-association by aSYN and hyperphosphorylated Tau (pTau) in a specific subset of neurotransmitter-containing, Secretogranin II (SgII)+ large, dense-core vesicles (LDCVs) responsible for neurotransmission of dopamine and other monoamines. The lipid vesicle-accumulation was concurrent with loss of PSD-95 suggesting synaptic destabilization. aSYN overexpression in the absence of lipid deregulation did not recapitulate the abnormal association with SgII+ vesicles. These results show lipid-dependent changes occur with age in neuronal vesicular membrane compartments that accumulate lipid-stabilized aSYN and pTau.

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