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An Examination Of The Role Of Adrenergic Receptor Stimulation In Mediating The Link Between Early-Life Stress And The Sensitization Of Neuroinflammatory-Based Depressive-Like Behavior In Isolated Guinea Pig Pups, Rachel Renate Kessler
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Early-life stress appears to sensitize neuroinflammatory signaling to increase later vulnerability for stress-related mental disorders. How stress initiates this process is unknown, but sympathetic nervous system activation during the early stress may be key. Isolated guinea pig pups display inflammatory-mediated depressive-like behavior and fever that sensitize on repeated isolation. We assessed whether sympathetic nervous system activity contributed to the sensitization process in guinea pig pups. In Experiment 1, the adrenergic agonist ephedrine, either alone or with cortisol, did not increase depressive-like behavior or fever during an initial isolation the following day. In Experiment 2, both depressive-like behavior and fever sensitized …
Stress Reducing Effects Of Oxytocin In A Maternal Separation Paradigm, Keely Jane O'Connell
Stress Reducing Effects Of Oxytocin In A Maternal Separation Paradigm, Keely Jane O'Connell
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This study compared the effects of centrally and peripherally administered oxytocin (OT) on HPA axis activity and the presence of both stress-induced active and passive behaviors in female guinea pig pups (Cavia porcellus) after 180-min of isolation . In Experiment 1, one dose of oxytocin (10μg/.2ml) was injected subcutaneously into the periphery. Plasma cortisol levels were reduced after 180-min of isolation and two passive behaviors, eye-closure and crouch, were reduced as well with the administration of oxytocin. In Experiment 2, two different doses (10μg/.2ml and 20μg/.2ml) were injected into the periphery with no significant results. In Experiment 3 one dose …