title: Effects of Acute Confinement Stress-induced Hypothalamic-Pituitary Adrenal Axis Activation and Concomitant Peripheral and Central Transforming Growth Factor-β1 Measures in Nonhuman Primates.
abstract: Transforming growth factor-β1 (TGF-β1) is a multifunctional cytokine with anti-inflammatory, immunosuppressive and neuroprotective properties. The hypothalamic-pituitary-adrenal (HPA) axis and immune system exert bidirectional influences on each other, via cortisol and TGF-β1, but the exact nature of the interaction is not well characterized. The current study examined the effects, in bonnet macaques (Macaca radiata), of two consecutive acute confinement stress periods in an unfamiliar room while mildly restrained, first without and then with dexamethasone pretreatment (0.01 mg/kg IM). Preceding the confinement studies, a non-stress control condition obtained contemporaneous levels of cortisol and TGF-β1 in both plasma and cerebrospinal fluid (CSF) to match the confinement stress studies. Subjects were reared under either normative or variable foraging demand (VFD) conditions. Since there were no rearing effects at baseline or for any of the conditions tested -- either for cortisol or TGF-β -- the study analyses were conducted on the combined rearing groups. The stress condition increased both plasma and CSF cortisol levels whereas dexamethasone pretreatment decreased cortisol concentrations to below baseline levels despite stress. The stress condition decreased TGF-β1 concentrations only in CSF but not in serum. Together the data suggested that stress-induced reductions of a centrally active neuroprotective cytokine occurs in the face of HPA axis activation, potentially facilitating glucocortoid-induced neurotoxicity. Stress-induced reductions of neuroprotective cytokines prompts exploration of protective measures against glucocorticoid-induced neurotoxicity.
authors.affiliation: Department of Psychiatry & Behavioral Science, Division of Neuropsychopharmacology, State University of New York, Downstate Medical Center, Brooklyn, NY, USA.
authors.forename: Jeremy D
authors.initials: JD
authors.lastname: Coplan
authors.affiliation: Department of Psychiatry & Behavioral Science, Division of Neuropsychopharmacology, State University of New York, Downstate Medical Center, Brooklyn, NY, USA; Department of Psychiatry, Yale School of Medicine, New Haven, CT, USA; Clinical Neurosciences Division, National Center for PTSD, West Haven, CT, USA.
authors.forename: Srinath
authors.initials: S
authors.lastname: Gopinath
authors.affiliation: Department of Psychiatry, Yale School of Medicine, New Haven, CT, USA; Clinical Neurosciences Division, National Center for PTSD, West Haven, CT, USA.
authors.forename: Chadi G
authors.initials: CG
authors.lastname: Abdallah
authors.affiliation: Department of Psychiatry & Behavioral Science, Division of Neuropsychopharmacology, State University of New York, Downstate Medical Center, Brooklyn, NY, USA.
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Margolis
authors.affiliation: Department of Psychiatry & Behavioral Science, Division of Neuropsychopharmacology, State University of New York, Downstate Medical Center, Brooklyn, NY, USA.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.affiliation: Department of Psychiatry & Behavioral Science, Division of Neuropsychopharmacology, State University of New York, Downstate Medical Center, Brooklyn, NY, USA.
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Scharf
authors.affiliation: Department of Psychiatry & Behavioral Science, Division of Neuropsychopharmacology, State University of New York, Downstate Medical Center, Brooklyn, NY, USA.
authors.forename: Leonard A
authors.initials: LA
authors.lastname: Rosenblum
authors.affiliation: Department of Cell Biology, SUNY Downstate Medical Center, Brooklyn, NY, USA.
authors.forename: Olcay A
authors.initials: OA
authors.lastname: Batuman
authors.affiliation: Division of hematology, SUNY Downstate Medical Center, Broioklyn, NY, USA.
authors.forename: Eric L P
authors.initials: EL
authors.lastname: Smith
keywords: cerebrospinal fluid; cortisol; cytokine; dexamethasone; glucocorticoid; nonhuman primate; stress; transforming growth factor-β1