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Posterior hypothalamic activity and cortical control during the PGE1 hyperthermia
1Department of Human Physiology and Integrated Biological Functions F. Bottazzi, Second University of Naples, Italy.
Neuroreport
|December 30, 1994
Summary
Prostaglandin E1 (PGE1) induces hyperthermia by increasing posterior hypothalamic activity. The cerebral cortex modulates this response, as functional decortication significantly reduces PGE1-induced hyperthermia.
Area of Science:
- Neuroscience
- Physiology
- Thermoregulation
Background:
- Prostaglandin E1 (PGE1) is implicated in fever responses.
- The posterior hypothalamus is a key thermoregulatory center.
- The role of the cerebral cortex in PGE1-induced hyperthermia is not fully understood.
Purpose of the Study:
- To investigate the role of the posterior hypothalamus in PGE1-induced hyperthermia.
- To examine the influence of the cerebral cortex on PGE1-induced thermoregulation.
Main Methods:
- Neuronal firing rates and body temperatures (interscapular brown adipose tissue and colonic) were measured in urethane-anesthetized rats.
- Intracerebroventricular injections of PGE1 or saline were administered.
- Functional decortication was performed in a subset of rats.
Main Results:
- PGE1 injection increased neuronal firing rate and body temperatures in intact rats.
- Functional decortication significantly attenuated the hyperthermic effects of PGE1.
- PGE1 did not significantly alter firing rate or temperature in decorticated rats.
Conclusions:
- The posterior hypothalamus is crucial for mediating PGE1-induced hyperthermia.
- The cerebral cortex plays a modulatory role in controlling posterior hypothalamic activity during fever.
- These findings highlight the integrated neural pathways involved in fever.