Baicalein induces apoptosis through ROS-mediated mitochondrial dysfunction pathway in HL-60 cells

Area of Science:

• Biochemistry
• Cell Biology
• Pharmacology

Background:

• Baicalein is a key compound from Scutellaria Baicalensis Georgi (Huang Qin), a herb used in traditional Chinese medicine.
• Leukemia, particularly acute promyelocytic leukemia, remains a significant health concern requiring novel therapeutic strategies.

Purpose of the Study:

• To investigate the potential of baicalein to induce apoptosis in human promyelocytic leukemia (HL-60) cells.
• To elucidate the underlying molecular mechanisms of baicalein-induced cell death.

Main Methods:

• Treatment of HL-60 cells with baicalein at various concentrations and time points.
• Analysis of apoptosis markers including poly-(ADP-ribose) polymerase (PARP) cleavage and DNA fragmentation.
• Assessment of mitochondrial pathway activation, including Bid cleavage, cytochrome c release, and caspase activation.
• Measurement of intracellular reactive oxygen species (ROS) levels and the effect of catalase.

Main Results:

• Baicalein effectively induced apoptosis in HL-60 cells at 100 microM for 6 hours, evidenced by PARP cleavage and DNA fragmentation.
• Mechanistic studies revealed baicalein-induced Bid cleavage, mitochondrial cytochrome c release, and activation of caspases -3, -8, and -9.
• Baicalein elevated intracellular hydrogen peroxide levels, and catalase treatment inhibited baicalein-induced DNA fragmentation, suggesting a role for ROS.

Conclusions:

• Baicalein triggers apoptosis in HL-60 cells via a ROS-mediated mitochondrial dysfunction pathway.
• These findings support the anticancer properties of baicalein and its therapeutic potential in leukemia treatment.
• The study enhances the understanding of baicalein's mechanism of action in traditional herbal medicine.