Dehydrocostus lactone enhances tumor necrosis factor-alpha-induced apoptosis of human leukemia HL-60 cells

Area of Science:

• Biochemistry
• Molecular Biology
• Pharmacology

Background:

• Nuclear transcription factor-kappaB (NF-kappaB) activation is crucial for cancer cell survival and resistance to apoptosis.
• Inhibiting NF-kappaB is a promising strategy to enhance the efficacy of anticancer treatments.
• Sesquiterpene lactones are compounds of interest for their ability to modulate NF-kappaB signaling.

Purpose of the Study:

• To investigate the effect of dehydrocostus lactone (DL) on NF-kappaB activation in human leukemia cells.
• To determine if DL can sensitize cancer cells to apoptosis induced by tumor necrosis factor-alpha (TNF-alpha).

Main Methods:

• Treatment of human leukemia HL-60 cells with dehydrocostus lactone (DL).
• Assessment of NF-kappaB activation by monitoring the degradation and phosphorylation of I-kappaB alpha.
• Evaluation of apoptosis induction and caspase-8 and caspase-3 activities.

Main Results:

• Dehydrocostus lactone (DL) effectively inhibits NF-kappaB activation by preventing TNF-alpha-induced degradation and phosphorylation of I-kappaB alpha.
• DL treatment renders HL-60 cells more susceptible to TNF-alpha-induced apoptosis.
• DL enhances the activity of key apoptotic enzymes, caspase-8 and caspase-3.

Conclusions:

• Dehydrocostus lactone (DL) is a potent inhibitor of NF-kappaB signaling in leukemia cells.
• DL sensitizes cancer cells to apoptosis, suggesting its potential as an adjuvant in cancer therapy.
• Targeting NF-kappaB with compounds like DL may overcome drug resistance in cancer treatment.