Macrophage polarization in innate immune responses contributing to pathogenesis of chronic kidney disease

Area of Science:

• Immunology
• Nephrology
• Molecular Biology

Background:

• Chronic kidney disease (CKD) involves inflammation, injury, and fibrosis, with macrophage-driven innate immune responses critical in its progression.
• Macrophage polarization into M1 (pro-inflammatory) and M2 (anti-inflammatory) states is a key factor in tissue injury, but its precise role in CKD pathogenesis requires further elucidation.

Purpose of the Study:

• To review the innate immune mechanisms governing macrophage polarization.
• To explore the multifaceted role of macrophage polarization in the initiation, progression, resolution, and recurrence of CKD.
• To discuss the potential of manipulating macrophage polarization as a therapeutic strategy for CKD.

Main Methods:

• Review of current literature on innate immunity, macrophage biology, and CKD.
• Analysis of pattern recognition receptors (e.g., Toll-like receptors, NLR inflammasomes) in macrophage activation.
• Examination of genetic factors, such as apolipoprotein L1 (APOL1) variants, influencing macrophage polarization in CKD.

Main Results:

• Macrophage polarization is initiated by pattern recognition receptors recognizing molecular motifs.
• Genetic variants in apolipoprotein L1 (APOL1) are associated with increased CKD prevalence and atypical M1 macrophage polarization.
• Dysregulated macrophage polarization contributes to CKD pathogenesis across its various stages.

Conclusions:

• Macrophage polarization is a central mechanism in CKD development and progression.
• Targeting macrophage polarization pathways may offer novel therapeutic strategies for CKD.
• Modulating macrophage polarization could complement existing treatments for glomerular diseases.