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Plasma calcitonin in rats with renal failure
1Department of Medicine and Geriatrics, Osaka University Medical School, Japan.
Calcified Tissue International
|March 1, 1988
Summary
The kidney plays a role in breaking down calcitonin (CT). Uremia, caused by kidney removal or ureter blockage, increased CT levels in rats, indicating impaired CT degradation.
Area of Science:
- Nephrology
- Endocrinology
- Biochemistry
Background:
- Calcitonin (CT) is a hormone that regulates calcium and phosphate metabolism.
- The role of the kidney in CT metabolism is not fully understood.
- Uremia, a condition of kidney dysfunction, may affect CT levels.
Purpose of the Study:
- To investigate the impact of the kidney on blood calcitonin levels.
- To determine if kidney impairment affects CT degradation.
- To compare CT levels in different models of uremia.
Main Methods:
- Uremia was induced in rats via total nephrectomy, partial nephrectomy, or ureteral ligation.
- Plasma CT concentrations were measured using radioimmunoassay.
- Calcium infusion was administered to assess CT response.
Main Results:
- Uremia induced by nephrectomy significantly increased plasma CT levels compared to ureteral ligation.
- Rats with total nephrectomy showed higher CT levels (49.3 +/- 1.7 pg/ml) than those with ureteral ligation (30.9 +/- 1.5 pg/ml).
- Blood urea nitrogen (BUN) levels did not significantly differ between nephrectomy and ureteral ligation groups, suggesting kidney-specific CT degradation.
Conclusions:
- The kidney is involved in the degradation of calcitonin.
- Kidney dysfunction leads to elevated circulating CT levels.
- These findings highlight the kidney's role in maintaining calcium homeostasis through CT metabolism.