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Cyanate and temperature regulation in anephric rabbits
The American Journal of Physiology
|July 1, 1985
Summary
This study investigated if elevated cyanate levels cause lower body temperature in uremia. Researchers found that while high cyanate doses lowered temperature, naturally occurring uremic concentrations did not, refuting the hypothesis.
Area of Science:
- Nephrology
- Physiology
- Biochemistry
Background:
- Uremia, a condition of kidney dysfunction, is often associated with lowered body temperature.
- Knochel and Seldin hypothesized that elevated circulating cyanate levels contribute to this hypothermia in uremia.
Purpose of the Study:
- To investigate the role of cyanate in the hypothermia observed during acute uremia.
- To determine if experimentally elevated cyanate levels in rabbits replicate uremic hypothermia.
Main Methods:
- Normal rabbits were infused with sodium cyanate to achieve varying plasma concentrations.
- Rabbits underwent nephrectomy to simulate uremic conditions and their plasma cyanate levels and body temperatures were monitored.
- Control rabbits received cyanate infusions mimicking uremic concentrations.
Main Results:
- Pharmacological doses of cyanate significantly reduced body temperature in rabbits.
- Nephrectomized rabbits showed only a minor increase in plasma cyanate levels, with a slight body temperature drop.
- Cyanate levels did not further increase in nephrectomized rabbits, despite continued temperature decline.
- Infusing control rabbits with uremic-level cyanate concentrations did not induce hypothermia.
Conclusions:
- Cyanate is not responsible for the lowered body temperature associated with the acute response to uremia.
- The hypothesis linking elevated cyanate to uremic hypothermia is not supported by these findings.