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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Prostaglandin E(2) fever mediated by inhibition of the GABAergic transmission in the region immediately adjacent to the organum vasculosum of the lamina terminalis.

Unilateral microinjection of prostaglandin (PG)E(2) into a region immediately adjacent to the organum vasculosum of the lamina terminalis (peri-OVLT) in the preoptic area elicited thermogenic, tachycardic, cutaneous vasoconstrictive, and hyperthermic responses simultaneously in urethane-chloralose-anesthetized rats. The magnitude of these responses increased dose-dependently over the range of 57 fmol-2.8 pmol, except for the vasoconstrictive response. Microinjection of a GABA(A) receptor antagonist, bicuculline methiodide or gabazine (5-20 pmol), into the PGE(2)-sensitive site in the peri-OVLT region also elicited responses similar to those induced by PGE(2). Although administration of a GABA(A) receptor agonist, muscimol (10 pmol), microinjected into the same site alone usually had no effect on the rate of whole-body O(2) consumption, heart rate or colon and skin temperatures, all PGE(2)-induced responses were blocked 10 min after the muscimol pretreatment and recovered at 50-90 min. Pretreatment with the vehicle, saline, had no effect on the PGE(2)-induced responses. These results suggest that spontaneous release of GABA and tonic activation of GABA(A) receptors in the peri-OVLT region prevent the elevation in the body core temperature under normal circumstances and that PGE(2)-induced febrile responses are mediated, at least in part, by inhibition of the GABAergic transmission in this area.[1]

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