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Sinomenine inhibits A549 human lung cancer cell invasion by mediating the STAT3 signaling pathway
Shulong Jiang1, Yebo Gao2, Wei Hou3
1Department of Oncology, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing 100053, P.R. China; Department of Oncology, Jining First People's Hospital, Jining, Shandong 272111, P.R. China.
Abstract:
Increasing evidence suggests that the failure of lung cancer treatment may occur as a result of tumor invasion and metastasis. Signal transducer and activator of transcription 3 (STAT3), an epithelial-mesenchymal transition-inducing transcription factor, is a key signaling molecule involved in the proliferation, apoptosis, invasion and metastasis of tumor cells. Sinomenine is an alkaloid compound with an antineoplastic potential against a variety of cancer cells. The aim of the present study was to assess the antitumor mechanisms of sinomenine in the A549 human lung cancer cell line. The results demonstrated that sinomenine manifested dose-dependent cytotoxicity and induced apoptosis in A549 cells. The protein expression of Janus kinase 2, STAT3, phosphorylated-STAT3, Snail, N-cadherin and vimentin decreased in sinomenine-treated cells, while E-cadherin protein expression increased. The regulation of STAT3, N-cadherin and E-cadherin by sinomenine was further confirmed by reverse transcription-quantitative polymerase chain reaction and immunofluorescent staining. It was demonstrated that sinomenine exerts inhibitory effects on A549 human lung cancer cell invasion, possibly through the inhibition of STAT3 signaling. These results provide a novel insight into the role of sinomenine in the treatment of non-small cell lung cancer.
Insights
Sinomenine effectively combats human lung cancer cells by reducing invasion and metastasis. This natural compound inhibits the STAT3 signaling pathway, offering a potential new treatment for non-small cell lung cancer.
Area of Science:
- Oncology
- Pharmacology
- Molecular Biology
Background:
- Tumor invasion and metastasis are primary causes of lung cancer treatment failure.
- Signal transducer and activator of transcription 3 (STAT3) is crucial for tumor cell proliferation, apoptosis, invasion, and metastasis.
- Sinomenine, a natural alkaloid, exhibits potential antineoplastic properties.
Purpose of the Study:
- To investigate the antitumor mechanisms of sinomenine in the A549 human lung cancer cell line.
- To assess the impact of sinomenine on STAT3 signaling and epithelial-mesenchymal transition (EMT) markers.
- To evaluate sinomenine's effect on lung cancer cell invasion and apoptosis.
Main Methods:
- Cell viability assays to determine cytotoxicity.
- Western blotting to analyze protein expression of key signaling molecules (JAK2, STAT3, p-STAT3, Snail, N-cadherin, E-cadherin).
- Reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and immunofluorescent staining to confirm gene and protein regulation.
Main Results:
- Sinomenine demonstrated dose-dependent cytotoxicity and induced apoptosis in A549 cells.
- Sinomenine treatment led to decreased expression of JAK2, STAT3, p-STAT3, Snail, and N-cadherin, and increased E-cadherin expression.
- Sinomenine inhibited A549 cell invasion, potentially via STAT3 pathway suppression.
Conclusions:
- Sinomenine exhibits significant antitumor effects against human lung cancer cells.
- The mechanism involves the inhibition of the STAT3 signaling pathway and modulation of EMT markers.
- Sinomenine represents a promising therapeutic agent for non-small cell lung cancer treatment.
