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- W2389712968 abstract "AIM:Abnormal hyperphosphorylation of tau plays a critical role in the pathogenesis of Alzheimer's disease(AD),and tau protein was hyperphosphorylated in type 2 diabetes. The present study was designed to explore the phosphorylation level of tau in hippocampus of type 2 diabetes rats which interrupted by very low density lipoprotein receptor(VLDLR)gene transfection. METHODS:Wistar male rats were randomized into 3 groups. The control group(CTL)was fed with normal food. The T2DM group and T2DM mediated VLDLR gene group were on high sugar,high fat and high protein diet for 3 months. The plasma insulin level was measured by RIA method,and the plasma glucose was determined by glucose-oxidase method. Total tau level,the phosphorylation level of tau at individual phosphorylation sites and the level of VLDLR were analyzed by Western blotting. The activity of glycogen synthase kinase 3β,a key component of insulin signal transduction pathway and a known tau kinase,in the hippocampus of rats was determined by using [γ-32P]-ATP and the specific peptide substrate. RESULTS:No significant difference of total tau level in hippocampus between T2DM group and T2DM mediated VLDLR gene group was observed. Tau protein in T2DM group was found to be more hyperphosphorylated at several AD-related phosphorylation sites(Ser214,Thr217,Ser396,Ser422 and Ser199/202)than that in CTL,while the immunoreaction at tau-1 site is weaker than that in CTL. VLDLR gene therapy reduced hyperphosphorylation sites of Thr217,Ser396,Ser422 and Ser199/202 of tau to almost the control level,but did not change the phosphorylation of Ser214 or Ser422 on tau. The expression of Ser214 was also observed by immunohistochemical assay. The phosphorylated tau modestly increased in hippocampus in T2DM group compared to CTL,but VLDLR gene treatment did not change the phosphorylation level. The phosphorylation of GSK-3β was decreased dramatically in the hippocampus in T2DM rats,and this phosphorylation was significantly increased after VLDLR gene treatment. CONCLUSION:These findings suggest that Raav mediated VLDLR gene treatment partially reverses tau hyperphosphorylation at several sites in T2DM rat hippocampus,which may mediate by inhibition of GSK-3β activity." @default.
- W2389712968 created "2016-06-24" @default.
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- W2389712968 date "2010-01-01" @default.
- W2389712968 modified "2023-09-25" @default.
- W2389712968 title "rAAV-mediated VLDLR gene transfection reduces tau hyperphosphorylation in hippocampus of type 2 diabetic rats" @default.
- W2389712968 hasPublicationYear "2010" @default.
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