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Articles by B Ghetti
Total Records ( 2 ) for B Ghetti
  P Garcia Reitbock , O Anichtchik , A Bellucci , M Iovino , C Ballini , E Fineberg , B Ghetti , L Della Corte , P Spano , G. K Tofaris , M Goedert and M. G. Spillantini

The pre-synaptic protein -synuclein is the main component of Lewy bodies and Lewy neurites, the defining neuropathological characteristics of Parkinson’s disease and dementia with Lewy bodies. Mutations in the -synuclein gene cause familial forms of Parkinson’s disease and dementia with Lewy bodies. We previously described a transgenic mouse line expressing truncated human -synuclein(1-120) that develops -synuclein aggregates, striatal dopamine deficiency and reduced locomotion, similar to Parkinson’s disease. We now show that in the striatum of these mice, as in Parkinson’s disease, synaptic accumulation of -synuclein is accompanied by an age-dependent redistribution of the synaptic SNARE proteins SNAP-25, syntaxin-1 and synaptobrevin-2, as well as by an age-dependent reduction in dopamine release. Furthermore, the release of FM1-43 dye from PC12 cells expressing either human full-length -synuclein(1–140) or truncated -synuclein(1-120) was reduced. These findings reveal a novel gain of toxic function of -synuclein at the synapse, which may be an early event in the pathogenesis of Parkinson’s disease.

  P Parchi , M Cescatti , S Notari , W. J Schulz Schaeffer , S Capellari , A Giese , W. Q Zou , H Kretzschmar , B Ghetti and P. Brown

Six clinico-pathological phenotypes of sporadic Creutzfeldt–Jakob disease have been characterized which correlate at the molecular level with the type (1 or 2) of the abnormal prion protein, PrPTSE, present in the brain and with the genotype of polymorphic (methionine or valine) codon 129 of the prion protein gene. However, to what extent these phenotypes with their corresponding molecular combinations (i.e. MM1, MM2, VV1 etc.) encipher distinct prion strains upon transmission remains uncertain. We studied the PrPTSE type and the prion protein gene in archival brain tissues from the National Institutes of Health series of transmitted Creutzfeldt–Jakob disease and kuru cases, and characterized the molecular and pathological phenotype in the affected non-human primates, including squirrel, spider, capuchin and African green monkeys. We found that the transmission properties of prions from the common sporadic Creutzfeldt–Jakob disease MM1 phenotype are homogeneous and significantly differ from those of sporadic Creutzfeldt–Jakob disease VV2 or MV2 prions. Animals injected with iatrogenic Creutzfeldt–Jakob disease MM1 and genetic Creutzfeldt–Jakob disease MM1 linked to the E200K mutation showed the same phenotypic features as those infected with sporadic Creutzfeldt–Jakob disease MM1 prions, whereas kuru most closely resembled the sporadic Creutzfeldt–Jakob disease VV2 or MV2 prion signature and neuropathology. The findings indicate that two distinct prion strains are linked to the three most common Creutzfeldt–Jakob disease clinico-pathological and molecular subtypes and kuru, and suggest that kuru may have originated from cannibalistic transmission of a sporadic Creutzfeldt–Jakob disease of the VV2 or MV2 subtype.

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