Coincidental changes in behavior and plasma cortisol in unrestrained pigs after intracerebroventricular injection of tumor necrosis factor-alpha

Endocrinology
E J WarrenR W Johnson

Abstract

The coincidental behavioral and physiological responses to inflammatory stimuli administered either peripherally or centrally were evaluated. In the first study, twenty castrated male pigs were injected ip with 0, 0.5, 5, or 50 microg/kg BW lipopolysaccharide (LPS). Body temperature was monitored telemetrically, and serial blood samples were collected via an indwelling jugular catheter for determination of plasma cortisol and tumor necrosis factor-alpha (TNF-alpha) concentrations. Sickness behaviors were measured during 10-min tests at 0, 2, 4, 8, 12, and 24 h post injection. The 5 and 50 microg/kg doses of LPS increased plasma concentrations of cortisol and TNF-alpha, while inducing anorexia, hypersomnia, and fever. In contrast, although 0.5 microg/kg LPS induced acute anorexia, hypersomnia, and fever, it did not increase plasma TNF-alpha; and the cortisol response was small and transient, suggesting the behavioral system in pigs is more responsive to LPS than the hypothalamic-pituitary-adrenal (HPA) axis. Because LPS-induced behavior and activation of the HPA axis involve proinflammatory cytokines in the brain, in a second study, unrestrained pigs with jugular catheters were injected intracerebroventricularly (I.C.V.) with re...Continue Reading

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Citations

Aug 11, 2006·Hormones and Behavior·Margret TuchschererArmin Tuchscherer
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Aug 12, 2009·Neuroscience and Biobehavioral Reviews·Nicole DellaGioia, Jonas Hannestad
Jun 9, 2021·Journal of Dairy Science·W E Brown, B J Bradford

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