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Neferine induces p38 MAPK/JNK1/2 activation to modulate melanoma proliferation, apoptosis, and oxidative stress
Jun Xie1, Ming-Hui Chen1, Chuan-Peng Ying1
1Institute of Dermatology and Venereology, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China.
Background:
Melanoma is a malignant skin cancer that has a poor prognosis in advanced patients. The aim of the present study was to investigate the antitumor role of neferine in melanoma.
Methods:
A375 and C32 cells were selected as research vectors in vitro. Cell counting Kit-8, 5-ethynyl-2'-deoxyuridine staining, transwell, and flow cytometry assay were used to examined cell malignant phenotypes. Mitochondrial dysfunction was detected by 5,50,6,60-tetrachloro-1,10,3,30-tetraethyl-imidacarbocyanine iodide staining and enzyme-linked immunosorbent assay. Reactive oxygen species (ROS) generation was measured using oxidation sensitive fluorescent probe. The phosphorylation activity of p38 and Jun-N-terminal kinase (JNK) 1/2 were examined by Western blot. A xenograft model was established via the subcutaneous injection of A375 cells into the right flank of BALB/c mice in vivo.
Results:
Neferine (2.5, 5, or 10 µM) treatment inhibited proliferation, invasion, and enhanced apoptotic rate of A375 and C32 cells. Neferine treatment induced abnormal changes in mitochondrial membrane potential. Further studies showed that neferine could significantly increase the production of reactive oxygen species (ROS) and 3,4-methylenedioxyamphetamine (MDA) content, decreased the superoxide dismutase (SOD) level. Neferine (5, 10, or 20 mg/kg) obviously suppressed the weight and size of the xenograft tumor, the number of apoptotic cells in vivo, and the expression of Ki67+ and survivin+ decreased. Notably, neferine also activated the phosphorylation of p38 and JNK1/2.
Conclusions:
Neferine inhibits the proliferative and invasion ability of melanoma cells and promotes their apoptosis, ameliorating the malignant progression of melanoma, likely achieved by upregulating the phosphorylation levels of p38 mitogen-activated protein kinase and JNK1/2.
Insights
Neferine, a natural compound, effectively inhibits melanoma cell proliferation and invasion while promoting apoptosis. This study demonstrates its potential as an effective treatment for melanoma by targeting key signaling pathways.
Area of Science:
- Oncology
- Pharmacology
- Molecular Biology
Background:
- Melanoma is an aggressive skin cancer with limited treatment options for advanced stages.
- Investigating novel therapeutic agents is crucial for improving patient outcomes.
Purpose of the Study:
- To evaluate the antitumor effects of neferine in melanoma.
- To elucidate the underlying molecular mechanisms of neferine's action.
Main Methods:
- In vitro studies using A375 and C32 melanoma cell lines.
- In vivo xenograft mouse model to assess therapeutic efficacy.
- Assays included proliferation, invasion, apoptosis, mitochondrial function, reactive oxygen species (ROS) generation, and Western blot analysis for signaling pathway activation.
Main Results:
- Neferine significantly inhibited melanoma cell proliferation and invasion, and induced apoptosis in vitro.
- Neferine treatment led to mitochondrial dysfunction, increased ROS and MDA levels, and decreased SOD levels.
- In vivo, neferine suppressed tumor growth, reduced Ki67 and survivin expression, and activated p38 and JNK1/2 phosphorylation.
Conclusions:
- Neferine exhibits potent antitumor activity against melanoma.
- Its mechanism involves inducing apoptosis, disrupting mitochondrial function, and modulating ROS levels.
- Neferine's therapeutic potential is likely mediated through the activation of p38 and JNK signaling pathways.
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