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Sökning: WFRF:(Oeckl P.)

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1.
  • Gray, E., et al. (författare)
  • A multi-center study of neurofilament assay reliability and inter-laboratory variability
  • 2020
  • Ingår i: Amyotrophic Lateral Sclerosis and Frontotemporal Degeneration. - : Informa UK Limited. - 2167-8421 .- 2167-9223. ; 21:5-6, s. 452-458
  • Tidskriftsartikel (refereegranskat)abstract
    • Objectives: Significantly elevated levels of neurofilament light chain (NfL) and phosphorylated neurofilament heavy chain (pNfH) have been described in the blood and cerebrospinal fluid (CSF) of amyotrophic lateral sclerosis (ALS) patients. The aim of this study was to evaluate the analytical performance of different neurofilament assays in a round robin with 10 centers across Europe/U.S.Methods: Serum, plasma and CSF samples from a group of five ALS and five neurological control patients were distributed across 10 international specialist neurochemical laboratories for analysis by a range of commercial and in-house neurofilament assays. The performance of all assays was evaluated for their ability to differentiate between the groups. The inter-assay coefficient of variation was calculated where appropriate from sample measurements performed across multiple laboratories using the same assay.Results:All assays could differentiate ALS patients from controls in CSF. Inter-assay coefficient of variation of analytical platforms performed across multiple laboratories varied between 6.5% and 41.9%.Conclusions:This study is encouraging for the growing momentum toward integration of neurofilament measurement into the specialized ALS clinic. It demonstrates the importance of 'round robin' studies necessary to ensure the analytical quality required for translation to the routine clinical setting. A standardized neurofilament probe is needed which can be used as international benchmark for analytical performance in ALS.
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2.
  • Oeckl, P., et al. (författare)
  • Blood beta-synuclein is related to amyloid PET positivity in memory clinic patients
  • 2023
  • Ingår i: Alzheimers & Dementia. - 1552-5260. ; 19:11, s. 4896-4907
  • Tidskriftsartikel (refereegranskat)abstract
    • Introduction: beta-synuclein is an emerging blood biomarker to study synaptic degeneration in Alzheimert's disease (AD), but its relation to amyloid-beta (A beta) pathology is unclear. Methods: We investigated the association of plasma beta-synuclein levels with ([18F])flutemetamol positron emission tomography (PET) in patients with AD dementia (n = 51), mild cognitive impairment (MCI-A beta+ n = 18, MCI-A beta-n = 30), non-AD dementias (n = 22), and non-demented controls (n = 5). Results: Plasma beta-synuclein levels were higher in A beta+(AD dementia, MCI-A beta+) than in A beta-subjects (non-AD dementias, MCI-A beta-) with good discrimination of A beta+ from A beta-subjects and prediction of A beta status in MCI individuals. A positive correlation between plasma beta-synuclein and A beta PET was observed in multiple cortical regions across all lobes. Discussion: Plasma beta-synuclein demonstrated discriminative properties for A beta PET positive and negative subjects. Our data underline that beta-synuclein is not a direct marker of A beta pathology and suggest different longitudinal dynamics of synaptic degeneration versus amyloid deposition across the AD continuum.
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