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- W2580595955 abstract "Aims The present study analyses molecular characteristics of the locus coeruleus ( LC ) and projections to the amygdala and hippocampus at asymptomatic early and middle Braak stages of neurofibrillary tangle ( NFT ) pathology. Methods Immunohistochemistry, whole‐transcriptome arrays and RT ‐ qPCR in LC and western blotting in hippocampus and amygdala in a cohort of asymptomatic individuals at stages I– IV of NFT pathology were used. Results NFT s in the LC increased in parallel with colocalized expression of tau kinases, increased neuroketal adducts and decreased superoxide dismutase 1 in neurons with hyperphosphorylated tau and decreased voltage‐dependent anion channel in neurons containing truncated tau were found. These were accompanied by increased microglia and AIF 1 , CD 68 , PTGS 2 , IL 1 β, IL 6 and TNF ‐ α gene expression. Whole‐transcriptome arrays revealed upregulation of genes coding for proteins associated with heat shock protein binding and genes associated with ATP metabolism and downregulation of genes coding for DNA ‐binding proteins and members of the small nucleolar RNA s family, at stage IV when compared with stage I. Tyrosine hydroxylase ( TH ) immunoreactivity was preserved in neurons of the LC , but decreased TH and increased α 2A adrenergic receptor protein levels were found in the hippocampus and the amygdala. Conclusions Complex alteration of several metabolic pathways occurs in the LC accompanying NFT formation at early and middle asymptomatic stages of NFT pathology. Dopaminergic/noradrenergic denervation and increased expression of α 2A adrenergic receptor in the hippocampus and amygdala occur at first stage of NFT pathology, suggesting compensatory activation in the face of decreased adrenergic input occurring before clinical evidence of cognitive impairment and depression." @default.
- W2580595955 created "2017-02-03" @default.
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- W2580595955 date "2017-04-19" @default.
- W2580595955 modified "2023-10-17" @default.
- W2580595955 title "Locus coeruleus at asymptomatic early and middle Braak stages of neurofibrillary tangle pathology" @default.
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