Title:Saikosaponin-A Exhibits Antipancreatic Cancer Activity by Targeting the
EGFR/PI3K/Akt Pathway
Volume: 24
Issue: 4
Author(s): Chengda Shi, Linglin Sun, Rong Fang, Shuying Zheng, Mingming Yu and Qiang Li*
Affiliation:
- Department of Radiology, The Affiliated People’s Hospital of Ningbo University, Ningbo, 315040, P.R. China
Keywords:
Saikosaponin-A, pancreatic cancer, EGFR/PI3K/Akt pathway, cell cycle, apoptosis, identification.
Abstract:
Background: A diagnosis of pancreatic cancer is pretty grim. Saikosaponin-A (SSA) is
a Chinese herbal extract with anticancer activity. However, the therapeutic effect of SSA on pancreatic
cancer remains elusive.
Aim: The study aims to evaluate the antitumor effects of SSA on pancreatic cancer cells in vitro
and in vivo.
Methods: After treatment with SSA, cell viability was measured using the CCK-8 assay, DAPI
staining was performed to analyze the effect on nuclear morphology, propidium iodide (PI) staining
was used to detect the cell cycle, and Annexin V/PI double staining was conducted to analyze
apoptosis. Then, the expression of apoptosis-related proteins and EGFR/PI3K/Akt pathway-related
proteins was determined using western blotting. The binding of SSA to EGFR was analyzed by
performing molecular docking. The mouse pancreatic cancer model was established by subcutaneously
injecting pancreatic cancer cells, and after 30 days of SSA gavage, the tumor volume was
calculated. Tumor tissue sections were subjected to Ki67 immunohistochemical staining and HE
staining.
Results: SSA inhibited the proliferation of pancreatic cancer cells. As the concentration of SSA
increased, the proportions of BxPC-3 and MIA PaCa-2 cells in the G0/G1 phase increased, the
proportions of early and late apoptotic cells also increased, and the apoptosis rate gradually increased.
Apoptosis inhibitor experiments indicated that SSA promoted the activation of caspase 3
to induce apoptosis in pancreatic cancer cells. In addition, SSA treatment significantly reduced the
levels of phosphorylated EGFR, Akt, and PI3K in the two cell lines. Molecular docking results
showed that SSA may have potential binding sites in EGFR. Results of the xenograft experiment
confirmed the antitumor effects of SSA, as evidenced by the decreased tumor weight and downregulated
expression of Ki67.
Conclusion: The results revealed that SSA exerted inhibitory effects on pancreatic cancer cells.
These effects may be related to the inactivation of the EGFR/PI3K/Akt signalling pathway.