Summary.
Although neurofibrillary tangles and senile plaques have been identified as the hallmark pathological changes in the brain of Alzheimer’s disease (AD), the relationship between them is still not fully understood. In the present study, we have studied the effect of endogenously overproduced amyloid β (Aβ) on tau by using wild type amyloid precursor protein (APP) transfected (N2a/APP695), or Swedish mutant APP plus Δ9 deleted presenilin-1 co-transfected (N2a/APPswe.Δ9) and APP vector transfected (N2a/vector) cell lines. We measured the secreted and intracellular Aβ, including Aβ1–40 and Aβ1–42, by Sandwich ELISA assay. It was shown that the levels of Aβ were increased time-dependently in N2a/APP695 and N2a/APPswe.Δ9 but not in N2a/vector upon butyric acid (BA) treatment. Compared with N2a/vector cells, tau in N2a/APP695 and N2a/APPswe.Δ9 cells was not extracted by RIPA buffer, and the SDS-extracted tau protein was hyperphosphorylated at Tau-1 and PHF-1 epitopes upon BA treatment. Obvious accumulation of the hyperphosphorylated tau in N2a/APP695 and N2a/APPswe.Δ9 cells was observed at 48 h after BA treatment. The total level of the extracted tau was reduced in N2a/APP695 and N2a/APPswe.Δ9 lines compared with N2a/vector cells by Western blot, and this reduction of total tau was also detected by immunofluorescence staining. No obvious alteration of tau mRNA was observed in both N2a/APP695 and N2a/APPswe.Δ9 cells compared with N2a/vector. This study provides direct evidence demonstrating that endogenously overproduced Aβ not only induces tau hyperphosphorylation but also decreases the level and solubility of tau in N2a cell lines.
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Abbreviations
- AD:
-
Alzheimer’s disease
- FAD:
-
familial Alzheimer disease
- Aβ:
-
β amyloid
- APP:
-
amyloid precursor protein
- PS:
-
presenilin
- BA:
-
butyric acid
- SP:
-
senile plaque
- NFT:
-
neurofibrillary tangle
- BCIP/NBT:
-
5-bromo-4-chloro-3-indolyl-phosphate/nitroblue tetrazolium
- ELISA:
-
enzyme linked immunosorbent assay
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Wang, YP., Wang, XC., Tian, Q. et al. Endogenous overproduction of β-amyloid induces tau hyperphosphorylation and decreases the solubility of tau in N2a cells. J Neural Transm 113, 1723–1732 (2006). https://doi.org/10.1007/s00702-006-0507-5
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DOI: https://doi.org/10.1007/s00702-006-0507-5