STING Activation in Various Cell Types in Metabolic Dysfunction-Associated Steatotic Liver Disease.

Area of Science:

• Immunology
• Hepatology
• Molecular Biology

Background:

• The immune system, particularly the stimulator of interferon genes (STING) pathway, plays a critical role in the progression of metabolic dysfunction-associated steatotic liver disease (MASLD) to metabolic dysfunction-associated steatohepatitis (MASH).
• Understanding STING's role is crucial for developing targeted therapies.

Purpose of the Study:

• To summarize the role of intrahepatic and extrahepatic STING signaling pathways in MASLD.
• To explore potential STING agonists or inhibitors for MASLD treatment.

Main Methods:

• Literature search on STING in MASLD using PubMed.
• Synthesis of findings on STING's involvement in liver and extrahepatic tissues.

Main Results:

• STING activation in hepatocytes causes protein aggregates and lipid deposition.
• STING influences hepatic macrophages, hepatic stellate cells (HSCs), and liver sinusoidal endothelial cells (LSECs), affecting autophagy, activation, senescence, and angiogenesis.
• Extrahepatic STING signaling impacts intestinal permeability, microecology, and adipocyte insulin action, all contributing to MASLD pathogenesis.

Conclusions:

• Numerous STING ligands are present in MASLD.
• The intricate intercellular communication modulated by STING in MASLD requires extensive investigation.