title: Parkin localizes to the Lewy bodies of Parkinson disease and dementia with Lewy bodies.
abstract: Mutations in alpha-synuclein (alpha S) and parkin cause heritable forms of Parkinson disease (PD). We hypothesized that neuronal parkin, a known E3 ubiquitin ligase, facilitates the formation of Lewy bodies (LBs), a pathological hallmark of PD. Here, we report that affinity-purified parkin antibodies labeled classical LBs in substantia nigra sections from four related human disorders: sporadic PD, inherited alphaS-linked PD, dementia with LBs (DLB), and LB-positive, parkin-linked PD. Anti-parkin antibodies also detected LBs in entorhinal and cingulate cortices from DLB brain and alphaS inclusions in sympathetic gangliocytes from sporadic PD. Double labeling with confocal microscopy of DLB midbrain sections revealed that approximately 90% of anti-alpha S-reactive LBs were also detected by a parkin antibody to amino acids 342 to 353. Accordingly, parkin proteins, including the 53-kd mature isoform, were present in affinity-isolated LBs from DLB cortex. Fluorescence resonance energy transfer and immunoelectron microscopy showed that alphaS and parkin co-localized within brainstem and cortical LBs. Biochemically, parkin appeared most enriched in cytosolic and postsynaptic fractions of adult rat brain, but also in purified, alpha S-rich presynaptic elements that additionally contained parkin's E2-binding partner, UbcH7. We conclude that parkin and UbcH7 are present with alphaS in subcellular compartments of normal brain and that parkin frequently co-localizes with alpha S aggregates in the characteristic LB inclusions of PD and DLB. These results suggest that functional parkin proteins may be required during LB formation.
authors: Department of Neurology, Center for Neurologic Diseases, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA. schloss@cnd.bwh.harvard.edu
authors: Michael G
authors: MG
authors: Schlossmacher
authors: Matthew P
authors: MP
authors: Frosch
authors: Wei Ping
authors: WP
authors: Gai
authors: Miguel
authors: M
authors: Medina
authors: Nutan
authors: N
authors: Sharma
authors: Lysia
authors: L
authors: Forno
authors: Tomoyo
authors: T
authors: Ochiishi
authors: Hideki
authors: H
authors: Shimura
authors: Ronit
authors: R
authors: Sharon
authors: Nobutaka
authors: N
authors: Hattori
authors: J William
authors: JW
authors: Langston
authors: Yoshikuni
authors: Y
authors: Mizuno
authors: Bradley T
authors: BT
authors: Hyman
authors: Dennis J
authors: DJ
authors: Selkoe
authors: Kenneth S
authors: KS
authors: Kosik
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001921:Brain / Q000378:metabolism / Q000473:pathology; D019556:COS Cells; D002460:Cell Line; D006801:Humans; D007150:Immunohistochemistry; D016631:Lewy Bodies / Q000737:chemistry / Q000473:pathology* / Q000648:ultrastructure; D020961:Lewy Body Disease / Q000378:metabolism / Q000473:pathology*; D008025:Ligases / Q000032:analysis* / Q000235:genetics / Q000276:immunology; D018613:Microscopy, Confocal; D008854:Microscopy, Electron; D008969:Molecular Sequence Data; D009154:Mutation; D010300:Parkinson Disease / Q000378:metabolism / Q000473:pathology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D014407:Tumor Cells, Cultured; D044767:Ubiquitin-Protein Ligases
chemical_list: D044767:Ubiquitin-Protein Ligases; C111567:parkin protein; D008025:Ligases