GM-CSF Enhances Pro-Inflammatory Macrophage Activation Linked to Akt/mTOR Pathway in Experimental Colitis
Overview
This study investigates the role of GM-CSF in ulcerative colitis (UC), revealing its significant elevation in UC patients and its impact on macrophage activation. GM-CSF expression was significantly elevated in colon biopsy tissues from UC patients compared to healthy controls, and its effects on macrophage polarization and glycolytic metabolism were examined.
Background
Ulcerative colitis (UC) is a chronic inflammatory disorder of the colon with increasing global prevalence. Macrophages play a crucial role in the immune response and their dysfunction is linked to UC pathogenesis. Understanding the mechanisms regulating macrophage activity is essential for developing targeted therapies for UC.
Data Highlights
GM-CSF expression was significantly elevated in colon biopsy tissues from UC patients compared to healthy controls. Administration of GM-CSF neutralizing antibody reduced macrophage infiltration and Th cell responses in DSS-treated mice.
Key Findings
GM-CSF levels were significantly higher in UC patient tissues than in controls.
Neutralization of GM-CSF in DSS-treated mice reduced gut inflammation.
GM-CSF promoted M1-type polarization of macrophages, enhancing Th17 responses.
The proinflammatory macrophage phenotype induced by GM-CSF was linked to glycolytic metabolism.
Activation of the Akt/mTOR pathway was involved in GM-CSF's effects on macrophages.
Clinical Implications
Further research is needed to explore the role of GM-CSF in UC treatment.
Conclusion
This study highlights the role of GM-CSF in macrophage activation and metabolic pathways in UC.
