miR-210-3p Ameliorates Metabolic Dysfunction-Associated Steatohepatitis-Related Fibrosis by Targeting ISCU and...

Area of Science:

• Hepatology
• Molecular Biology
• Biochemistry

Background:

• Metabolic dysfunction-associated steatohepatitis (MASH) fibrosis significantly impacts patient prognosis.
• The precise molecular mechanisms driving MASH-associated fibrosis remain largely unknown.
• Investigating novel microRNAs like miR-210-3p is crucial for understanding MASH pathogenesis.

Purpose of the Study:

• To explore the role of miR-210-3p in the development of MASH-related fibrosis.
• To elucidate the molecular targets and pathways regulated by miR-210-3p in hepatic stellate cells.
• To determine if miR-210-3p influences ferroptosis in the context of MASH.

Main Methods:

• Microarray analysis and RT-qPCR were used to assess miR-210-3p expression in MASH patients and animal models.
• In vitro studies utilized LX2 and primary hepatic stellate cells stimulated with palmitic acid.
• Western blotting, dual luciferase assays, and immunofluorescence staining identified target genes and mechanisms, including ferroptosis markers.

Main Results:

• miR-210-3p expression was significantly downregulated in MASH models (MCD and HFD+CCL4 diets) and in vitro cell models.
• Overexpression of miR-210-3p attenuated MASH-related fibrosis by promoting ferroptosis in hepatic stellate cells.
• Iron-sulfur cluster assembly enzyme (ISCU) was identified as a direct downstream target of miR-210-3p, and its modulation affected ferroptosis.

Conclusions:

• miR-210-3p expression is decreased in the context of MASH-related fibrosis.
• miR-210-3p plays a protective role by targeting ISCU and inducing ferroptosis in hepatic stellate cells.
• The ISCU-IRP1-CD71 axis is a key pathway mediating miR-210-3p's effect on ferroptosis in MASH fibrosis.