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Intranephronic calculosis in the Brazilian squirrel monkey
Abstract:
Brazilian squirrel monkey kidneys removed before and after administration of parathormone were studied by microdissection, polarizing microscopy, alizarin red and von Kossa's stains, and microchemical analysis. Intralumenal crystalline-matrix masses were observed in both groups but were increased in frequency after parathormone administration. Specific staining showed the presence of calcium and phosphorus, and specific chemical tests suggested the presence of uric acid or urate salts. Refractile alizarin red positive droplets were observed in the tubular cells of the pars convoluta in parathormone-treated animals. Urinary stone formation in these animals is unique in that the location and types of stones produced are similar to that seen in man. The squirrel monkey is a good experimental model to study renal stone disease and further studies of its etiology, structure, composition, and means of control should be performed.
Insights
Parathormone administration increased crystalline deposits in squirrel monkey kidneys, similar to human kidney stones. These findings highlight the squirrel monkey as a valuable model for studying renal stone disease.
Area of Science:
- Nephrology
- Biochemistry
- Primate Models
Background:
- Renal stone disease, or kidney stones, affects a significant portion of the human population.
- Understanding the etiology and mechanisms of kidney stone formation is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the effects of parathormone on kidney stone formation in Brazilian squirrel monkeys.
- To evaluate the squirrel monkey as a model for human renal stone disease.
Main Methods:
- Kidney tissues from squirrel monkeys, before and after parathormone administration, were analyzed.
- Techniques included microdissection, polarizing microscopy, alizarin red and von Kossa's stains, and microchemical analysis.
Main Results:
- Intralumenal crystalline-matrix masses were observed, with increased frequency after parathormone treatment.
- Calcium, phosphorus, and urate salts were detected in the kidney tissues.
- Refractile droplets positive for alizarin red were found in tubular cells of parathormone-treated animals.
Conclusions:
- The squirrel monkey exhibits urinary stone formation characteristics similar to humans.
- This species serves as a relevant experimental model for studying renal stone disease.
- Further research into the etiology, structure, composition, and control of stones in this model is warranted.