Plasma pyroglutamate-modified amyloid beta differentiates amyloid pathology.

Pyroglutamate-modified amyloid β (AβpE3) could be a biomarker for Aβ plaque pathology in the brain. An ultra-high-sensitive assay is needed for detecting AβpE3-40.Immunomagnetic reduction was used for quantification of AβpE3-40 in plasma from 46 participants. The concentrations of AβpE3-40 of these subjects were compared with 18F-florbetapir positron emission tomography (PET) images.AβpE3-40 concentration was 44.1 ± 28.2fg/mL in PET- (n = 28) and 91.6 ± 54.6fg/mL in PET+ (n = 18; P < .05). The cutoff value of AβpE3-40 for discriminating PET- from PET+ was 55.5fg/mL, resulting in a sensitivity of 83.3%, a specificity of 71.4%. The concentration of AβpE3-40 showed a moderate correlation (r = 0.437) with PET standardized uptake value ratio.We did not enroll pre-clinical AD subject with normal cognition but Aβ PET+. It would be an important issue to explore the feasibility of using AβpE3-40 for screening pre-clinical subjects.These results reveal the feasibility of detecting Aβ pathology using quantification of a plaque-derived Aβ molecule in plasma.

Lin, Kun-Ju (author)
Liu, Huei-Chun (author)
Andreasson, Ulf,1968Gothenburg University,Göteborgs universitet,Institutionen för neurovetenskap och fysiologi, sektionen för psykiatri och neurokemi,Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry(Swepub:gu)xaulfz (author)
Blennow, Kaj,1958Gothenburg University,Göteborgs universitet,Institutionen för neurovetenskap och fysiologi, sektionen för psykiatri och neurokemi,Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry(Swepub:gu)xbleka (author)
Zetterberg, Henrik,1973Gothenburg University,Göteborgs universitet,Institutionen för neurovetenskap och fysiologi, sektionen för psykiatri och neurokemi,Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry(Swepub:gu)xzethe (author)
Yang, Shieh-Yueh (author)
Göteborgs universitetInstitutionen för neurovetenskap och fysiologi, sektionen för psykiatri och neurokemi (creator_code:org_t)

By the author/editor: Wang, Pei-Ning; Lin, Kun-Ju; Liu, Huei-Chun; Andreasson, Ulf, ...; Blennow, Kaj, 19 ...; Zetterberg, Henr ...; show more...; Yang, Shieh-Yueh; show less...

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Basic Medicine; and Neurosciences

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