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Thyroid hormone profiles in experimental acute renal failure
M Bogićević1, S Ilić, V Djordjević
1Institute of Nephrology and Hemodialysis, University Clinical Center, Nis, Yugoslavia.
Renal Failure
|January 1, 1993
Summary
Uremia in dogs significantly alters thyroid hormones, with stress and malnutrition playing key roles in this dysfunction. These factors contribute to changes in thyroxine (T4) and triiodothyronine (T3) levels.
Area of Science:
- Veterinary Medicine
- Endocrinology
- Nephrology
Background:
- Uremia, a condition of kidney dysfunction, can impact various physiological systems.
- Thyroid hormone regulation is crucial for metabolic homeostasis.
- The effects of induced uremia on thyroid hormone profiles in dogs are not fully understood.
Purpose of the Study:
- To investigate the impact of induced uremia on thyroid hormone levels in dogs.
- To differentiate the effects of uranyl nitrate injection versus bilateral ureteral ligation on thyroid function.
- To explore the potential roles of stress and malnutrition in uremia-induced thyroid dysfunction.
Main Methods:
- Induction of uremia in dogs via intravenous uranyl nitrate or bilateral ureteral ligation.
- Sham-operated group as a control.
- Serial blood sampling at regular intervals (up to 144 hours).
- Radioimmunoassay measurement of serum T4, T3, free T4 (fT4), free T3 (fT3), reverse T3 (rT3), and cortisol.
Main Results:
- Uremic dogs exhibited a sharp initial decrease in T4, T3, fT4, and fT3, followed by a plateau or slower decline.
- Sham-operated dogs showed only minor, transient hormone level changes.
- Reverse T3 levels tended to increase, with a significant rise after ureteral ligation.
- Cortisol levels were highest in the ureteral ligation group and significantly elevated in all uremic groups.
Conclusions:
- Induced uremia in dogs causes significant thyroid hormone alterations.
- Stress, indicated by elevated cortisol, appears to play a major role in thyroid dysfunction.
- Uremic toxins and malnutrition likely contribute to thyroid dysfunction alongside stress.