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Capsaicin impairs preoptic serotonin-sensitive structures mediating hypothermia in rats.
Neuroscience Letters
|February 28, 1985
Summary
Systemic capsaicin treatment impairs thermoregulation by altering the sensitivity of preoptic warm-responsive structures to serotonin (5-HT). This affects the body
Area of Science:
- Neuroscience
- Physiology
- Pharmacology
Background:
- Systemic capsaicin administration can induce thermoregulatory disturbances.
- Serotonin (5-HT) plays a role in regulating body temperature, particularly in the preoptic area.
Purpose of the Study:
- To investigate the mechanisms underlying capsaicin-induced thermoregulatory disturbances.
- To examine the role of preoptic and intracisternal serotonin (5-HT) in capsaicin-treated rats.
Main Methods:
- Rats were treated systemically with capsaicin.
- Serotonin (5-HT) was injected into the preoptic region and cisterna magna.
- Body temperature and tail skin vasodilation were monitored in control and capsaicin-treated rats.
Main Results:
- Intracisternal 5-HT caused similar hypothermia in both control and capsaicin-treated rats.
- Intrapreoptic 5-HT induced hypothermia and vasodilation in controls, but not in capsaicin-treated rats.
- Capsaicin treatment blunted the thermoregulatory response to preoptic 5-HT.
Conclusions:
- Impaired thermoregulation after systemic capsaicin is linked to altered sensitivity of preoptic warm-responsive structures to serotonin (5-HT).
- Preoptic serotonin pathways are crucial for mediating thermoregulatory responses affected by capsaicin.