Redox modulator iron complexes trigger intrinsic apoptosis pathway in cancer cells

Area of Science:

• Biochemistry and Molecular Biology
• Cancer Research
• Medicinal Chemistry

Background:

• Multidrug resistance in cancer necessitates novel therapeutic strategies.
• Cancer cells often exhibit altered iron metabolism and redox homeostasis, influenced by iron regulatory proteins like transferrin.
• Targeting these cellular processes presents a potential avenue for cancer treatment.

Purpose of the Study:

• To investigate the efficacy of nitrogen-based heterocyclic iron chelators and their iron complexes in combating liver cancer.
• To explore the underlying mechanisms, including redox homeostasis disruption and induction of apoptosis.

Main Methods:

• Synthesis and application of novel nitrogen-based heterocyclic iron chelators and their iron complexes.
• Evaluation of anti-proliferative effects on liver cancer cells and 3D spheroids.
• Analysis of reactive oxygen species generation, lipid peroxidation, mitochondrial dysfunction, and apoptosis induction.

Main Results:

• The iron chelators and their complexes demonstrated significant efficacy in preventing liver cancer cell proliferation (EC50: 340 nM for IITK4003).
• These agents induced oxidative stress by generating reactive Fe(IV)=O species and accumulating lipid peroxides.
• Mitochondrial dysfunction and subsequent cytochrome c release activated the caspase cascade, triggering intrinsic apoptosis.

Conclusions:

• Targeting cancer cell redox homeostasis with specific iron chelators and complexes is a viable strategy against liver cancer.
• The developed iron complexes effectively induce cancer cell apoptosis by exploiting inherent iron overload.
• This approach holds promise for developing novel, iron-complex-based anticancer therapeutics.