Heme as a metabolic cell-fate switch.

Area of Science:

• Biochemistry
• Cell Biology
• Immunology

Background:

• Heme availability is a critical regulator of cellular processes, including mitochondrial function, redox balance, and innate immune responses.
• Emerging research highlights distinct cellular heme states that dictate susceptibility to specific regulated cell death (RCD) modalities.

Purpose of the Study:

• To present a unifying framework for understanding how heme availability influences diverse RCD pathways.
• To connect heme metabolism to cell fate decisions in the context of cancer, infection, and metabolic disorders.

Main Methods:

• Literature review and synthesis of recent findings on heme metabolism and RCD.
• Conceptual framework development based on threshold-dependent heme states.

Main Results:

• Heme availability functions as a metabolic rheostat, controlling cellular fate.
• Specific heme thresholds are linked to distinct RCD pathways, including cuproptosis, ferroptosis, apoptosis, pyroptosis, and PANoptosis.
• This rheostat model offers a unified perspective on RCD.

Conclusions:

• Heme's role extends beyond basic metabolism to actively orchestrate cell death.
• The metabolic rheostat model provides a novel lens for investigating RCD in disease pathogenesis.
• Targeting heme availability could offer therapeutic strategies for diseases involving aberrant cell death.