LIN Ting,PENG Jiaxin,TAO Yangyang,et al.Astragaloside Ⅳ Induces Autophagy and Apoptosis in Nasopharyngeal Carcinoma Cells via PI3K/Akt/mTOR Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(24):113-121.
LIN Ting,PENG Jiaxin,TAO Yangyang,et al.Astragaloside Ⅳ Induces Autophagy and Apoptosis in Nasopharyngeal Carcinoma Cells via PI3K/Akt/mTOR Pathway[J].Chinese Journal of Experimental Traditional Medical Formulae,2023,29(24):113-121. DOI: 10.13422/j.cnki.syfjx.20230726.
Astragaloside Ⅳ Induces Autophagy and Apoptosis in Nasopharyngeal Carcinoma Cells via PI3K/Akt/mTOR Pathway
To investigate the effect and underlying molecular mechanism of astragaloside-Ⅳ (AS-Ⅳ) on autophagy and apoptosis of nasopharyngeal carcinoma cells.
Method
2
In
experiments
in vitro
, the effect of AS-Ⅳ on the autophagy of nasopharyngeal carcinoma cells was observed by monodansylcadaverine (MDC) staining and transmission electron microscopy (TEM). In experiments
in vivo
, immunofluorescence (IF) and Western blot were used to detect the changes in autophagy and apoptosis and the expression of key proteins in the phosphatidylinositol 3-kinase/protein kinase B/mammalian target of rapamycin (PI3K/Akt/mTOR) signaling pathway after the establishment of a xenograft tumor model in nude mice.
Result
2
After 5-8F cells were treated with AS-Ⅳ of different doses (5, 10, 20 μmol·L
-1
), the fluorescence intensity of autophagy in AS-Ⅳ groups significantly increased as compared with that in the blank group. The fluorescence expression of autophagy in AS-Ⅳ groups was the strongest after intervention for 24 hours, and the fluorescence expression in the 10 μmol·L
-1
AS-Ⅳ group was the most obvious. The autophagy activator rapamycin (RAPA) induced more autophagosomes in 5-8F cells under the transmission electron microscope, and 3-methyladenine (3-MA), an autophagy inhibitor, did not induce autophagosome formation in 5-8F cells under the transmission electron microscope as compared with the results in the blank group. In the 10 μmol·L
-1
AS-Ⅳ group, the intracellular structure and cell membrane were intact and clear, and autophagosome formation was observed. Compared with the blank group, the AS-Ⅳ groups showed inhibited tumor volume (
P
<
0.05,
P
<
0.01), potentiated fluorescence signals of microtubule-associated protein l light chain 3 type Ⅱ/microtubule-associated protein l light chain 3 type Ⅰ (LC3 Ⅱ/Ⅰ) and cleaved Caspase-3 (
P
<
0.05,
P
<
0.01), increased expression levels of the mammalian homolog of yeast ATG6 (Beclin-1), LC3 Ⅱ/Ⅰ, cleaved Caspase-3, and cleaved PARP (
P
<
0.05,
P
<
0.01), down-regulated expression of ubiquitin-binding protein (p62) (
P
<
0.05,
P
<
0.01), and reduced protein expression levels of phosphorylated PI3K (p-PI3K), phosphorylated Akt (p-Akt), and phosphorylated mTOR (p-mTOR) (
P
<
0.05,
P
<
0.01).
Conclusion
2
AS-Ⅳ can induce autophagy and apoptosis of nasopharyngeal carcinoma cells, and the mechanism is presumably attributed to the activation of the PI3K/Akt/mTOR signaling pathway.
nasopharyngeal carcinomaastragaloside Ⅳautophagyapoptosisphosphatidylinositol 3-kinases/protein kinase B/mammalian target of rapamycin(PI3K/Akt/mTOR)
references
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