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Related Experiment Video

Updated: May 31, 2025

Isolation, Characterization, and Purification of Macrophages from Tissues Affected by Obesity-related Inflammation
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Single-Cell RNA Sequencing Reveals Macrophage Dynamics During MASH in Leptin-Deficient Rats.

Xiaoming Xin1, Yaohua Ni1, Jing Wang1

  • 1School of Pharmacy, Shanghai University of Medicine and Health Sciences, Shanghai 201318, China.

Cells
|January 24, 2025
PubMed
Summary

This study reveals unique hepatic macrophage dynamics in rat models of metabolic dysfunction-associated steatohepatitis (MASH). Macrophages shift phenotypes distinctively, interacting more within the liver microenvironment during MASH progression.

Keywords:
MASHinflammationmacrophageratsingle cell RNA sequencing

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Area of Science:

  • Hepatology
  • Immunology
  • Single-cell genomics

Background:

  • Metabolic dysfunction-associated steatohepatitis (MASH) involves complex hepatic immune cell roles.
  • Hepatic macrophage heterogeneity and function in MASH are well-studied in humans and mice but not rats.
  • Understanding rat models is crucial for MASH research due to their unique physiology.

Purpose of the Study:

  • To investigate the cellular and molecular dynamics of hepatic macrophages in a rat model of MASH.
  • To characterize macrophage heterogeneity and function during MASH development at single-cell resolution.
  • To identify key cell-cell communication pathways involved in MASH pathogenesis in rats.

Main Methods:

  • Single-cell RNA sequencing (scRNA-seq) of liver tissues from MASH model rats.
  • Analysis of cell populations, macrophage phenotypes, and cell-cell interactions.
  • Identification of upregulated cell-communication pathways using computational tools.

Main Results:

  • scRNA-seq revealed increased macrophages and endothelial cells, with decreased NK and B cells in MASH rats.
  • Rat hepatic macrophages exhibited a unique M1 to M2 transition, marked by Cd163 but not classical markers.
  • Lipid-associated macrophages (LAMs) increased, and macrophage interactions with other liver cells were altered.
  • The macrophage migration inhibitory factor (MIF) pathway was identified as a top upregulated pathway.

Conclusions:

  • This study provides a single-cell resolution dissection of hepatic macrophage dynamics during MASH in rats.
  • Rat hepatic macrophages display unique characteristics and transitions distinct from mouse and human models.
  • The findings offer essential tools and insights for future MASH research using rat models.