Conditioned taste aversion but not adrenal activity develops to ICV administration of interleukin-1 in rats.
In a previous investigation with mice, the paired presentation of either odor or taste cues with the peripheral (IP) administration of the immunoactive peptide interleukin-1 (IL-1) led to the conditioned enhancement of glucocorticoid production. The present study found that an initial central infusion of IL-1 in the presence of saccharin cues produced a robust taste aversion but not a conditioned elevation of either ACTH or corticosterone production. These results indicate that the glucocorticoid response induced by centrally administered IL-1 in rats is independent of the behaviorally aversive properties of this cytokine which are conditionable. The differential effects of IP versus ICV administration of IL-1 on glucocorticoid conditioning requires a clearer specification of the respective signaling mechanisms and pathways activated by these two routes of administration.
Janz
L J
LJ
Department of Psychology, University of Manitoba, Winnipeg, Canada.
Brown
R
R
Zuo
L
L
Falk
J
J
Greenberg
A H
AH
Dyck
D G
DG
D000324:Adrenocorticotropic Hormone / Q000097:blood; D000818:Animals; D001245:Association Learning / Q000187:drug effects; D001362:Avoidance Learning / Q000187:drug effects*; D003214:Conditioning, Classical / Q000187:drug effects*; D003345:Corticosterone / Q000097:blood; D007276:Injections, Intraventricular; D007375:Interleukin-1 / Q000494:pharmacology*; D008297:Male; D010913:Pituitary-Adrenal System / Q000187:drug effects*; D051381:Rats; D011919:Rats, Inbred Strains; D011994:Recombinant Proteins / Q000494:pharmacology; D013649:Taste / Q000187:drug effects*
D007375:Interleukin-1; D011994:Recombinant Proteins; D000324:Adrenocorticotropic Hormone; D003345:Corticosterone