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Hyperphosphorylation and insolubility of alpha-synuclein in transgenic mouse oligodendrocytes
Philipp J Kahle1, Manuela Neumann, Laurence Ozmen
1Laboratory for Alzheimer's and Parkinson's Disease Research, Department of Biochemistry, Ludwig Maximilians University, D-80336 Munich, Germany. chaass@pbm.med.uni-muenchen.de
Abstract:
(Oligodendro)glial cytoplasmic inclusions composed of alpha-synuclein (alpha SYN) characterize multiple system atrophy (MSA). Mature oligodendrocytes (OLs) do not normally express alpha SYN, so MSA pathology may arise from aberrant expression of alpha SYN in OLs. To study pathological deposition of alpha SYN in OLs, transgenic mice were generated in which human wild-type alpha SYN was driven by a proteolipid protein promoter. Transgenic alpha SYN was detected in OLs but no other brain cell type. At the light microscopic level, the transgenic alpha SYN profiles resembled glial cytoplasmic inclusions. Strikingly, the diagnostic hyperphosphorylation at S129 of alpha SYN was reproduced in the transgenic mice. A significant proportion of the transgenic alpha SYN was detergent insoluble, as in MSA patients. The histological and biochemical abnormalities were specific for the disease-relevant alpha SYN because control green fluorescent protein was fully soluble and evenly distributed throughout OL cell bodies and processes. Thus, ectopic expression alpha SYN in OLs might initiate salient features of MSA pathology.
Insights
Aberrant expression of alpha-synuclein (alpha SYN) in oligodendrocytes (OLs) may initiate multiple system atrophy (MSA) pathology. Transgenic mice models show alpha SYN accumulation and hyperphosphorylation in OLs, mimicking human MSA disease features.
Area of Science:
- Neuroscience
- Pathology
- Genetics
Background:
- Multiple system atrophy (MSA) is characterized by glial cytoplasmic inclusions of alpha-synuclein (alpha SYN).
- Mature oligodendrocytes (OLs) typically do not express alpha SYN, suggesting aberrant expression may initiate MSA.
- Understanding the role of OLs in alpha SYN pathology is crucial for MSA research.
Purpose of the Study:
- To investigate the pathological deposition of alpha SYN in OLs.
- To develop a transgenic mouse model for studying alpha SYN-driven OL pathology relevant to MSA.
- To determine if ectopic alpha SYN expression in OLs can recapitulate key features of MSA.
Main Methods:
- Generation of transgenic mice expressing human wild-type alpha SYN under the proteolipid protein promoter.
- Detection and localization of transgenic alpha SYN within brain cells using microscopy.
- Biochemical analysis to assess alpha SYN solubility and phosphorylation status (S129).
- Comparison with control transgenic mice expressing green fluorescent protein.
Main Results:
- Transgenic alpha SYN was specifically detected in OLs, not other brain cell types.
- Microscopic profiles of transgenic alpha SYN resembled glial cytoplasmic inclusions found in MSA.
- Hyperphosphorylation of alpha SYN at S129, a hallmark of MSA, was reproduced in the model.
- A significant portion of the transgenic alpha SYN was detergent-insoluble, mirroring MSA patient pathology.
- Control protein (green fluorescent protein) remained soluble and evenly distributed, confirming specificity.
Conclusions:
- Ectopic expression of alpha SYN in OLs can initiate salient pathological features of MSA.
- This transgenic model provides a valuable tool for studying the mechanisms of MSA pathogenesis.
- Aberrant alpha SYN expression in OLs is a potential initiating event in multiple system atrophy.