Danger signals from mitochondrial DAMPS in trauma and post-injury sepsis

Area of Science:

• Immunology
• Cell Biology
• Molecular Biology

Background:

• Host defense relies on 'danger responses' to sterile and infective threats.
• Pattern recognition receptors (PRR) detect pathogen-associated molecular patterns (PAMPs) and danger-associated molecular patterns (DAMPs).
• Inflammation is a common outcome of PRR activation by diverse alarmins, explaining clinical similarities between sterile and infective responses.

Purpose of the Study:

• To explore the role of mitochondria (MT) in initiating host danger responses.
• To review the molecular mechanisms by which mitochondrial components act as alarmins.
• To understand how MT contribute to sterile and infective inflammatory pathways.

Main Methods:

• Review of existing literature on danger responses, PRRs, and alarmins.
• Analysis of the evolutionary relationship between mitochondria and bacteria.
• Discussion of known mitochondrial alarmins and their signaling pathways.

Main Results:

• Mitochondria are evolutionarily linked to bacteria, positioning them at the intersection of sterile and infective danger signaling.
• Released mitochondrial components act as potent alarmins, triggering a wide range of inflammatory events.
• Overlapping signaling pathways involving PRRs and alarmins explain the shared clinical features of sterile and infective inflammation.

Conclusions:

• Mitochondrial danger signals contribute significantly to the inflammatory response.
• Understanding mitochondrial alarmins is crucial for deciphering the complex interplay between sterile and infective inflammation.
• Mitochondria represent a key target for modulating inflammatory conditions.