Macrophage miR-210 induction and metabolic reprogramming in response to pathogen interaction boost life-threatening...

Area of Science:

• Immunology
• Molecular Biology
• Metabolic Regulation

Background:

• Uncontrolled immune responses to pathogens can be fatal.
• Regulatory mechanisms of these responses are not fully understood.

Purpose of the Study:

• To investigate the role of microRNA-210 (miR-210) in immune responses to pathogens.
• To explore miR-210 as a potential therapeutic target for sepsis and related conditions.

Main Methods:

• Investigated hypoxia-inducible factor 1α-dependent miR-210 up-regulation in monocytes and macrophages.
• Utilized miR-210 knockout models and pharmacologic inhibition in mice.
• Analyzed macrophage metabolism, cytokine storm, organ damage, and survival rates.
• Correlated human miR-210 levels with sepsis incidence and mortality.

Main Results:

• miR-210 knockout or inhibition significantly mitigated endotoxemia, bacteremia, sepsis, and parasitosis symptoms.
• miR-210 promoted a pro-inflammatory macrophage state by shifting metabolism from mitochondrial respiration to glycolysis.
• Downregulation of ISCU (iron-sulfur cluster assembly enzyme) by miR-210 contributed to metabolic changes.
• Elevated miR-210 levels in human monocytes correlated with sepsis incidence and mortality.

Conclusions:

• miR-210 acts as a key regulator of macrophage metabolism and inflammatory responses during infection.
• Targeting miR-210 presents a promising strategy for developing novel diagnostics and therapeutics for sepsis.