Circulating monocytes accelerate acute liver failure by IL-6 secretion in monkey

Area of Science:

• Hepatology
• Immunology
• Toxicology

Background:

• Acute liver failure (ALF) has high mortality rates and limited effective treatments due to poor understanding of its pathophysiology.
• Existing research has not fully elucidated the cellular and molecular mechanisms driving ALF progression.

Purpose of the Study:

• To investigate the cellular and molecular events leading to ALF using an amatoxin-induced rhesus monkey model.
• To identify key factors and cellular players involved in ALF pathogenesis and inflammation.

Main Methods:

• Induction of ALF in rhesus monkeys using amatoxin.
• Systematic analysis of serum factors and cytokines during ALF progression.
• Investigation of IL-6 production in circulating monocytes.
• Validation of monocyte-derived IL-6's role in mice models.

Main Results:

• Amatoxin-induced ALF in monkeys presented with severe hepatic injury, systemic inflammation, and mortality.
• Interleukin-6 (IL-6) showed the most rapid and drastic increase in serum.
• Circulating monocytes were identified as the primary source of IL-6 during ALF.
• Ablation of monocyte-derived IL-6 reduced liver injury and systemic inflammation in mice.

Conclusions:

• Circulating monocytes play a critical role in initiating and accelerating ALF.
• Monocyte-derived IL-6 is a key mediator of liver injury and systemic inflammation in ALF.
• Targeting monocyte-derived IL-6 presents a promising therapeutic avenue for clinical treatment of ALF.