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The role of macrophages and reactive oxygen species in experimental hydronephrosis
1Department of Medicine, Milton S. Hershey Medical Center and the Pennsylvania State University College of Medicine, Hershey, USA.
Abstract:
A common feature to a number of immune and non-immune renal diseases of diverse etiology is the infiltration of the glomerular and tubulointerstitial compartments by infiltrating macrophages. This review will focus on experimental data supporting the role of the infiltrating renal macrophage as a mediator of interstitial fibrosis during the course of obstructive nephropathy as it pertains to the unilateral ureteral obstruction model in the rat. The mechanical disturbance resulting from complete ureteral obstruction causes tubular injury/dysfunction resulting in a florid pro-inflammatory and fibrogenic response. The central pathobiological theme drawn from data in this model is that macrophage-derived pro-inflammatory mediators, including fibrogenic cytokines and reactive oxygen species, represent pivotal links between the pro-inflammatory state of ureteral obstruction and the late development of interstitial fibrosis. We propose that increased intrarenal oxidant stress, owing to an overproduction of reactive oxygen species and dysregulated tubular antioxidant enzymes, can induce overexpression of fibrogenic cytokines and chemoattractants, as well as increased transcription and synthesis of extracellular matrix proteins, leading to tubular loss and fibrogenesis.
Insights
In obstructive nephropathy, infiltrating macrophages drive interstitial fibrosis through inflammatory mediators and oxidative stress. Targeting these pathways may prevent kidney damage.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Macrophage infiltration is common in various kidney diseases.
- Obstructive nephropathy involves tubular injury and inflammation.
- Interstitial fibrosis is a hallmark of chronic kidney disease progression.
Purpose of the Study:
- To review experimental evidence on the role of renal macrophages in obstructive nephropathy.
- To elucidate the mechanisms linking macrophage activity to interstitial fibrosis.
- To highlight the contribution of oxidative stress in this process.
Main Methods:
- Focus on data from the unilateral ureteral obstruction (UUO) rat model.
- Analysis of pro-inflammatory and fibrogenic responses.
- Examination of reactive oxygen species (ROS) and antioxidant enzyme activity.
Main Results:
- UUO induces tubular injury, inflammation, and fibrosis.
- Macrophage-derived mediators (cytokines, ROS) are key.
- Increased intrarenal oxidant stress promotes fibrogenic cytokine overexpression and extracellular matrix synthesis.
Conclusions:
- Renal macrophages are central mediators of interstitial fibrosis in obstructive nephropathy.
- Macrophage-driven inflammation and oxidative stress are critical.
- Understanding these mechanisms may lead to novel therapeutic strategies for kidney fibrosis.