The antineoplastic agent α-bisabolol promotes cell death by inducing pores in mitochondria and lysosomes

Area of Science:

• Biochemistry
• Cell Biology
• Pharmacology

Background:

• Sesquiterpene alpha-bisabolol (α-BSB) exhibits cytotoxic effects against various human cancer cells.
• The precise intracellular mechanisms underlying α-BSB's action require further elucidation.

Purpose of the Study:

• To investigate the cytotoxic mechanisms of α-BSB in preclinical models of myeloid, lymphoid, and epithelial neoplasias.
• To characterize organelle damage, autophagy, cytostatic effects, and apoptosis induced by α-BSB.

Main Methods:

• Utilized single-cell analysis techniques including flow cytometry and immunocytology.
• Conducted cytotoxicity and proliferation assays to assess α-BSB's impact.
• Focused on key steps in the cytotoxic cascade: cellular entry, organelle pore formation, cell death pathway activation, autophagy, and apoptosis.

Main Results:

• α-BSB enters cells via lipid rafts and induces pore formation in mitochondria and lysosomes.
• The compound activates both caspase-dependent and caspase-independent cell death pathways.
• α-BSB triggers autophagy and apoptosis, leading to a multi-layered cytotoxic effect.

Conclusions:

• α-BSB's effectiveness stems from its ability to induce concurrent cell death signals via multiple regulatory layers.
• This multi-targeted action neutralizes aberrant cancer cell survival mechanisms, overcoming treatment resistance.