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Protocatechualdehyde Induces S-Phase Arrest and Apoptosis by Stimulating the p27(KIP1)-Cyclin A/D1-CDK2 and
Shi Zhong1, You-Gui Li2, Dong-Feng Ji3
1Sericultural Research Institute, Zhejiang Academy of Agricultural Science, Hangzhou 310021, China. zshi2002@163.com.
Abstract:
Protocatechualdehyde (PCA) extracted from Phellinus gilvus exhibits anti-cancer activity in human colorectal carcinoma cells (HT-29). However, the underlying mechanisms remain poorly understood. We performed an in vitro study involving MTT, flow cytometry, RT-PCR, and western blot analyses to investigate the effects of PCA treatment on cell proliferation, cell cycle distribution, apoptosis, and expression of several cell cycle-related genes in HT-29 cells. The treatment enhanced S-phase cell cycle and apoptosis in HT-29 cells in a dose-dependent manner. Western blot results showed that PCA treatment decreased the expression levels of cyclin A, cyclin D1, and p27(KIP1) but increased those of cyclin-dependent kinase 2 (CDK2) in HT-29 cells. Furthermore, the expression levels of B-cell lymphoma/leukemia-2 (Bcl-2) and B-cell lymphoma/leukemia-xL (Bcl-xL) were down-regulated, whereas the levels of BH3-interacting domain death agonist (Bid), Bcl-2 homologous antagonist/killer (Bak), and cytosolic cytochrome c were significantly upregulated. Thus, the enzymes caspases-9, -3, -8, and -6 were found to be activated in HT-29 cells with PCA treatment. These results indicate that PCA-induced S-phase cell cycle arrest and apoptosis involve p27(KIP1)-mediated activation of the cyclin-A/D1-Cdk2 signaling pathway and the mitochondrial apoptotic pathway.
Insights
Protocatechualdehyde (PCA) from Phellinus gilvus induces S-phase cell cycle arrest and apoptosis in colorectal cancer cells. This anticancer effect involves the p27(KIP1)/cyclin pathway and mitochondrial apoptosis.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- Colorectal carcinoma (HT-29) is a significant health concern.
- Protocatechualdehyde (PCA) from Phellinus gilvus shows potential anticancer properties.
- The precise mechanisms of PCA's action on cancer cells require elucidation.
Purpose of the Study:
- To investigate the anticancer mechanisms of PCA in human colorectal carcinoma HT-29 cells.
- To analyze PCA's effects on cell proliferation, cell cycle, and apoptosis.
- To examine the modulation of key cell cycle and apoptosis-related genes by PCA.
Main Methods:
- In vitro study using MTT assay, flow cytometry, RT-PCR, and Western blot.
- Analysis of cell proliferation, cell cycle distribution, and apoptosis induction.
- Assessment of protein and gene expression levels, including cyclins, CDKs, Bcl-2 family proteins, and caspases.
Main Results:
- PCA treatment led to S-phase cell cycle arrest and apoptosis in HT-29 cells.
- PCA altered the expression of cell cycle regulators: decreased cyclin A, cyclin D1, p27(KIP1); increased CDK2.
- PCA modulated apoptosis pathways: downregulated Bcl-2/Bcl-xL, upregulated Bid/Bak/cytochrome c, and activated caspases-9, -3, -8, -6.
Conclusions:
- PCA induces S-phase cell cycle arrest and apoptosis in HT-29 cells.
- The mechanism involves p27(KIP1)-mediated regulation of the cyclin-A/D1-Cdk2 pathway.
- Mitochondrial apoptotic pathway activation is crucial for PCA's anticancer effects.
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