Title:Physalin B Reduces Tau Phosphorylation and Cell Apoptosis in HEK293 Cells
by Activating FoxO1
Volume: 17
Author(s): Wei Zhang, Yating Shi, Mingti Lv, Yimin Zhang, Wei Ren, Ruling Shi, Hecheng Wang*Linlin Shan
Affiliation:
- School of Life and Pharmaceutical Science, Dalin University of Technology, Panjin 124221, China
Keywords:
Physalin B, Tau phosphorylation, Apoptosis, FoxO1, Alzheimer’s disease, AD cell model.
Abstract:
Background:
Physalin B (PB) is one of the main active compounds of Solanaceae plants, with a wide range of biological activities. PB reportedly has the
potential to treat Alzheimer’s disease (AD).
Objective:
In this study, we investigated the effect of PB on Tau phosphorylation and cell apoptosis using Tau-expressing HEK293 cells (HEK293/Tau) as a
cellular model.
Methods:
The optimum concentration of PB to treat HEK293/Tau cells was determined using the CCK-8 assay. Additionally, the expression of FoxO1,
Tau-5, p-Tau (T231, S262, and S404), ERK, p-ERK, GSK-3β, and p-GSK-3β was detected using western blotting to determine the effect of PB on
Tau phosphorylation. The apoptosis rate was detected using flow cytometry, and the expression of Bax and Bcl-2 was detected using western
blotting and verified using real-time quantitative polymerase chain reaction (RT-qPCR). Moreover, cells were transfected with FoxO1 siRNA to
downregulate FoxO1 expression, and the expression of the above-mentioned proteins was detected to verify the effect of PB on Tau
phosphorylation and cell apoptosis.
Results:
After 24 h of PB treatment, the phosphorylation levels of Tau at S404, S262, and T231 sites decreased significantly, and the activities of GSK-3β
and ERK were inhibited. PB also reduced cell apoptosis by reducing the expression of Bax and increasing the expression of Bcl-2. In addition, PB
decreased Tau phosphorylation and cell apoptosis by upregulating FoxO1.
Conclusion:
The natural compound PB exhibited a protective effect in the AD cell model by increasing FoxO1 expression and reducing Tau phosphorylation
and cell apoptosis.