Brain tissue Aβ42 levels are linked to shunt response in idiopathic normal pressure hydrocephalus

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

OBJECTIVE The authors conducted a study to test if the cortical brain tissue levels of soluble amyloid beta (Aβ) reflect the propensity of cortical Aβ aggregate formation and may be an additional factor predicting surgical outcome following idiopathic normal pressure hydrocephalus (iNPH) treatment. METHODS Highly selective ELISAs (enzyme-linked immunosorbent assays) were used to quantify soluble Aβ40, Aβ42, and neurotoxic Aβ oligomers/protofibrils, associated with Aβ aggregation, in cortical biopsy samples obtained in patients with iNPH (n = 20), sampled during ventriculoperitoneal (VP) shunt surgery. Patients underwent pre- and postoperative (3-month) clinical assessment with a modified iNPH scale. The preoperative CSF biomarkers and the levels of soluble and insoluble Aβ species in cortical biopsy samples were analyzed for their association with a favorable outcome following the VP shunt procedure, defined as a ≥ 5-point increase in the iNPH scale. RESULTS The brain tissue levels of Aβ42 were negatively correlated with CSF Aβ42 (Spearman's r = -0.53, p < 0.05). The Aβ40, Aβ42, and Aβ oligomer/protofibril levels in cortical biopsy samples were higher in patients with insoluble cortical Aβ aggregates (p < 0.05). The preoperative CSF Aβ42 levels were similar in patients responding (n = 11) and not responding (n = 9) to VP shunt treatment at 3 months postsurgery. In contrast, the presence of cortical Aβ aggregates and high brain tissue Aβ42 levels were associated with a poor outcome following VP shunt treatment (p < 0.05). CONCLUSIONS Brain tissue measurements of soluble Aβ species are feasible. Since high Aβ42 levels in cortical biopsy samples obtained in patients with iNPH indicated a poor surgical outcome, tissue levels of Aβ species may be associated with the clinical response to shunt treatment.

Detaljer

Författare
  • Sami Abu Hamdeh
  • Johan Virhammar
  • Dag Sehlin
  • Irina Alafuzoff
  • Kristina Giuliana Cesarini
  • Niklas Marklund
Enheter & grupper
Externa organisationer
  • Uppsala universitet, Historiska institutionen
Forskningsområden

Nyckelord

Originalspråkengelska
Sidor (från-till)121-129
Antal sidor9
TidskriftJournal of Neurosurgery
Volym130
Utgåva nummer1
Tidigt onlinedatum2018 jan 19
StatusPublished - 2018
PublikationskategoriForskning
Peer review utfördJa