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Ultrastructural changes in the nephron and renal protein cleaving function in suckling rabbits with experimental
E A Bardakhch'yan1, N G Kharlanova, Y M Lomov
1Laboratory of Pathomorphology and Pathophysiology, Plague Control Institute, Rostov-on-Don, Russia.
Insights
Immature rabbit kidneys possess a protein-digesting system in proximal tubules. Cholera infection intensifies this process, overwhelming the nephrons and increasing susceptibility to toxins.
Area of Science:
- Renal physiology
- Microbiology
- Cell biology
Background:
- Suckling rabbits (10-12 days old) exhibit immature nephrons.
- Proximal tubule epithelium contains a proteolytic system for extracellular protein digestion.
- This system is a key feature of renal cortical ultrastructure.
Purpose of the Study:
- To investigate the role of the proteolytic system in cholera infection in immature kidneys.
- To understand how cholera affects protein digestion within nephrons.
- To assess the impact of this process on nephron vulnerability.
Main Methods:
- Examination of renal cortical ultrastructure in intact suckling rabbits.
- Analysis of protein cleavage during cholera infection.
- Evaluation of nephron overload and reactivity.
Main Results:
- Cholera infection leads to intensive cleavage of exogenous protein, initiating in podocytes and completing in proximal tubule epitheliocytes.
- Intensive extracellular hydrolysis, alongside urine production, overloads the nephron.
- Impaired nephrothelium reactivity and increased vulnerability to cholera toxins were observed.
Conclusions:
- The proteolytic system in immature rabbit kidneys plays a significant role in the pathogenesis of cholera.
- Nephron overload due to enhanced protein digestion compromises kidney function and increases susceptibility to cholera's effects.
- Understanding these mechanisms is crucial for addressing cholera-related renal complications.
Abstract:
Immature nephrons and the presence of a proteolytic system mediating extracellular protein digestion in the epithelium of proximal tubules are characteristic features of renal cortical ultrastructure in intact 10-12-day-old suckling rabbits. Cholera infection is accompanied by intensive cleavage of exogenous protein, which starts in podocytes and is completed in the cytoplasm of the proximal tubule epitheliocytes. Overload to nephron associated (in addition to urine production) with intensive extracellular hydrolysis impairs nephrothelium reactivity and increases its vulnerability to cholera exo- and endotoxins and their mediators.
