Phenolic Compounds Cannabidiol, Curcumin and Quercetin Cause Mitochondrial Dysfunction and Suppress Acute...

Area of Science:

• Biochemistry
• Cell Biology
• Pharmacology

Background:

• The anticancer mechanisms of phenolic compounds are not fully understood.
• Cannabidiol has previously been shown to induce cell death in acute lymphoblastic leukemia (ALL) through mitochondrial dysfunction.

Purpose of the Study:

• To investigate the cytotoxic effects of various phenolic compounds on human T-ALL Jurkat cells.
• To elucidate the underlying mechanisms, focusing on mitochondrial function, calcium levels, and cell death pathways.

Main Methods:

• Resazurin-based metabolic assays to assess cytotoxicity.
• Flow cytometry to measure mitochondrial membrane potential (∆Ψm), mitochondrial calcium ([Ca2+]m), reactive oxygen species, and cell death.
• Pharmacological inhibitors (cyclosporine A, Ru360) were used to probe specific mitochondrial pathways.

Main Results:

• Cannabidiol, curcumin, and quercetin exhibited significant cytotoxic effects against Jurkat cells.
• These active phenols dissipated mitochondrial membrane potential (∆Ψm) and increased mitochondrial calcium ([Ca2+]m).
• Inhibitor studies indicated that cannabidiol and curcumin induce cell death via mitochondrial calcium overload, while curcumin and quercetin also suppress leukemic cell metabolism through direct mitochondrial uncoupling.

Conclusions:

• Cannabidiol, curcumin, and quercetin exert antileukemic activity by inducing mitochondrial calcium overload.
• Curcumin and quercetin possess a dual mechanism, also uncoupling mitochondrial metabolism.
• These findings highlight the potential of targeting mitochondrial pathways for ALL treatment.