Phosphorylated α-synuclein can be detected in blood plasma and is potentially a useful biomarker for Parkinson's disease

Penelope G. Foulds, J. Douglas Mitchell, Angela Parker, Roisin Turner, Gerwyn Green, Peter Diggle, Masato Hasegawa, Mark Taylor, David Mann, David Allsop

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126 Scopus citations


Parkinson's disease (PD) is characterized by the presence of Lewy bodies containing phosphorylated and aggregated α-synuclein (α-syn). α-Syn is present in human body fluids, including blood plasma, and is a potential biomarker for PD. Immunoassays for total and oligomeric forms of both normal and phosphorylated (at Ser-129) α-syn have been used to assay plasma samples from a longitudinal cohort of 32 patients with PD (sampled at mo 0, 1, 2, 3), as well as single plasma samples from a group of 30 healthy control participants. The levels of α-syn in plasma varied greatly between individuals, but were remarkably consistent over time within the same individual with PD. The mean level of phospho-α-syn was found to be higher (P=0.053) in the PD samples than the controls, whereas this was not the case for total α-syn (P=0.244), oligo-α-syn (P=0.221), or oligo-phospho-α-syn (P=0.181). Immunoblots of plasma revealed bands (at 21, 24, and 50-60 kDa) corresponding to phosphorylated α-syn. Thus, phosphorylated α-syn can be detected in blood plasma and shows more promise as a diagnostic marker than the nonphosphorylated protein. Longitudinal studies undertaken over a more extended time period will be required to determine whether α-syn can act as a marker of disease progression.

Original languageEnglish (US)
Pages (from-to)4127-4137
Number of pages11
JournalFASEB Journal
Issue number12
StatePublished - Dec 2011
Externally publishedYes


  • Immunoassay
  • Immunoblot
  • Lewy body
  • Oligomer

ASJC Scopus subject areas

  • Biochemistry
  • Biotechnology
  • Genetics
  • Molecular Biology


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