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LRRK2 and parkin immunoreactivity in multiple system atrophy inclusions

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Abstract

Certain genetic defects in LRRK2 and parkin are pathogenic for Parkinson’s disease (PD) and both proteins deposit in the characteristic Lewy bodies. LRRK2 is thought to be involved in the early initiation of Lewy bodies. The involvement of LRRK2 and parkin in the similar cellular deposition of fibrillar α-synuclein in glial cytoplasmic inclusions (GCI) in multiple system atrophy (MSA) has not yet been assessed. To determine whether LRRK2 and parkin may be similarly associated with the abnormal deposition of α-synuclein in MSA GCI, paraffin-embedded sections from the basal ganglia of 12 patients with MSA, 4 with PD and 4 controls were immunostained for LRRK2, parkin, α-synuclein and oligodendroglial proteins using triple labelling procedures. The severity of neuronal loss was graded and the proportion of abnormally enlarged oligodendroglia containing different combinations of proteins assessed in 80–100 cells per case. Parkin immunoreactivity was observed in only a small proportion of GCI. In contrast, LRRK2 was found in most of the enlarged oligodendroglia in MSA and colocalised with the majority of α-synuclein-immunopositive GCI. Degrading myelin sheaths containing LRRK2-immunoreactivity were also observed, showing an association with one of the earliest oligodendroglial abnormalities observed in MSA. The proportion of LRRK2-immunopositive GCI was negatively associated with an increase in neuronal loss and α-synuclein-immunopositive dystrophic axons. Our results indicate that an increase in LRRK2 expression occurs early in association with myelin degradation and GCI formation, and that a reduction in LRRK2 expression in oligodendroglia is associated with increased neuronal loss in MSA.

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Acknowledgments

Human brain tissue samples were received from the Australian Brain Donor Programme Prince of Wales Medical Research Institute Tissue Resource Centre, which is supported by the National Health and Medical Research Council of Australia, Australian Brain Donor Programme approved request #GH060505 to GMH. We are grateful to the brain donors and their families for supporting medical research, and to Prof. Poul Henning Jensen (Denmark) for the p25α antibody. This research in Australia was supported by NHMRC project grant 210186. The Queen Square Brain Bank is supported by the Reta Lila Weston Institute for Neurological Studies, the Progressive Supranuclear Palsy (Europe) Association, the Sarah Matheson Trust and the Alzheimer’s Research Trust.

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Correspondence to Glenda Margaret Halliday.

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Huang, Y., Song, Y.J.C., Murphy, K. et al. LRRK2 and parkin immunoreactivity in multiple system atrophy inclusions. Acta Neuropathol 116, 639–646 (2008). https://doi.org/10.1007/s00401-008-0446-3

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