Investigation of effect of cortisone and endotoxin on mesangial function
S Batsford1, H Schneider, H Takamiya
1Department of Immunology, Zentrum für Hygiene, Freiburg, FRG.
Abstract:
The effect of endotoxin and cortisone treatment on the mesangial handling of ferritin in rats was examined. Experimental conditions were chosen where the RES was saturated, this enabled us to test for a direct effect on the mesangium. We were unable to detect any influence of either endotoxin or cortisone on the degree of uptake, or the rate of elimination of ferritin from the mesangium. Endotoxin did appear to affect the intra-glomerular distribution of ferritin, which was seen mainly as larger nodules. The iron core of ferritin was found to persist for longer than the antigenic (protein) portion, indicating that some degree of breakdown of ferritin molecules occured within the mesangium.
Insights
Endotoxin and cortisone did not alter ferritin uptake or elimination by rat mesangium. However, endotoxin changed ferritin distribution, and its iron core persisted longer than its protein part, suggesting mesangial breakdown.
Area of Science:
- Nephrology
- Immunology
- Toxicology
Background:
- The reticuloendothelial system (RES) plays a role in clearing substances like ferritin.
- Understanding mesangial handling of ferritin is crucial for kidney health.
- Investigating the impact of endotoxin and cortisone on kidney function is important.
Purpose of the Study:
- To determine the effect of endotoxin and cortisone on mesangial ferritin uptake and elimination in rats.
- To examine the intra-glomerular distribution of ferritin under these experimental conditions.
- To assess the breakdown of ferritin within the mesangium.
Main Methods:
- Experimental rats were treated with endotoxin and cortisone.
- The reticuloendothelial system (RES) was saturated to isolate mesangial effects.
- Ferritin uptake, elimination, and distribution within the glomerulus were analyzed.
Main Results:
- Neither endotoxin nor cortisone affected the rate of ferritin uptake or elimination by the mesangium.
- Endotoxin altered ferritin distribution, leading to larger intra-glomerular nodules.
- The iron component of ferritin persisted longer than the protein component in the mesangium.
Conclusions:
- Endotoxin and cortisone do not directly impact mesangial ferritin clearance.
- Endotoxin influences ferritin's localization within the glomerulus.
- Ferritin undergoes partial degradation within the rat mesangium.
