Altered mitochondrial calcium handling and cell death by necroptosis: An emerging paradigm

Area of Science:

• Cellular Biology
• Molecular Mechanisms of Cell Death
• Mitochondrial Biology

Background:

• Classical necroptosis involves death receptors and caspase inhibition, with therapeutics in clinical trials.
• A non-classical necroptosis pathway, linked to mitochondrial dysfunction, has an emerging and complex molecular mechanism.
• Impaired mitochondrial calcium ([Ca2+]m) handling is known in necrotic cell death, but its role in necroptosis is unclear.

Purpose of the Study:

• To elucidate the molecular mechanisms of necroptosis, focusing on the emerging role of mitochondrial dysfunction.
• To investigate the interplay between mitochondrial calcium ([Ca2+]m) handling and necroptosis.
• To reconcile contradictory findings on mitochondrial dysfunction's role in necroptosis and identify therapeutic targets.

Main Methods:

• Review and synthesis of existing literature on necroptosis signaling pathways.
• Analysis of molecular aspects connecting mitochondrial dysfunction and necroptosis.
• Discussion of the role of mitochondrial calcium ([Ca2+]m) in cell fate determination.

Main Results:

• Altered mitochondrial calcium ([Ca2+]m) handling plays a central role in mitochondrial dysfunction-mediated necroptosis.
• Contradictory findings regarding mitochondrial dysfunction in necroptosis are analyzed and potential explanations provided.
• Mitochondrial calcium ([Ca2+]m) can be critical for cell fate in some conditions but dispensable in others.

Conclusions:

• Mitochondrial dysfunction, particularly altered [Ca2+]m handling, is a key factor in a non-classical necroptosis paradigm.
• Understanding the precise role of [Ca2+]m in necroptosis is crucial for resolving conflicting data.
• Key molecular targets involved in impaired [Ca2+]m handling and necroptosis offer potential for therapeutic intervention.