Dopamine involvement in thermoregulatory responses to heat in rats.
The role of dopamine in thermoregulatory challenges was studied in rats exposed to thermoneutrality then to heat with pretreatment by SCH23390 (i.p., D1/D5 receptor antagonist), sulpiride (i.p., D2 receptor antagonist) or piribedil (i.p., D2/D3 receptor agonist). Heat exposure leads to a rise in rectal temperature followed by a steady plateau ending with a terminal increase. The duration of both heat exposure and the plateau increased largely after SCH23390 and rose slightly after sulpiride. Piribedil was ineffective on these parameters but lowered rectal temperature at thermoneutrality. It is suggested that the thermoregulatory failure observed in heat-exposed rats may implicate dopamine through D1/D5 and in a lesser extent through D2 receptors. The inefficacy of piribedil suggests that dysregulations in synaptic transmission may exist.
Canini
F
F
Centre de recherches du Service de santé des armées, Unité de Bioénergétique et Environnement, La Tronche, France.
Bourdon
L
L
D000704:Analysis of Variance; D000818:Animals; D001552:Benzazepines / Q000494:pharmacology; D001833:Body Temperature Regulation / Q000187:drug effects / Q000502:physiology*; D004298:Dopamine / Q000502:physiology*; D018491:Dopamine Agonists / Q000494:pharmacology; D018492:Dopamine Antagonists / Q000494:pharmacology*; D006358:Hot Temperature; D008297:Male; D010891:Piribedil / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D013469:Sulpiride / Q000494:pharmacology
D001552:Benzazepines; D018491:Dopamine Agonists; D018492:Dopamine Antagonists; D013469:Sulpiride; D010891:Piribedil; D004298:Dopamine