Anjo J Chover-Gonzalez

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Corticosteroids have potent immunosuppressive and anti-inflammatory effects. Although corticosteroids are an important weapon in the clinical arsenal for treating inflammatory episodes, the mechanisms underlying the actions and regulation of endogenous corticosteroids remain obscure. In the late 1980s and early 1990s, a hypothesis was proposed that(More)
The release of endogenous glucocorticoids is critical in regulating the severity of disease activity in patients with inflammatory conditions such as rheumatoid arthritis (RA). Blocking cortisol production results in a flare-up in disease activity in RA patients, and surgical removal of the adrenals in patients with Cushing's disease has been reported to(More)
We have investigated the effect of (a) stress and (b) steroid feed-back on the interleukin-1 beta (IL-1 beta)-mediated increase of corticotropin-releasing factor (CRF) mRNA in the hypothalamic paraventricular nucleus. Both IL-1 beta and stress resulted in increased levels of CRF mRNA and when both were given together, the combination resulted in an additive(More)
OBJECTIVE To test the hypothesis that there is an association between susceptibility to inflammation and a hyporesponsive hypothalamo-pituitary-adrenal (HPA) axis. METHODS Animals were separated on the basis of behaviour in the learned helplessness (LH) paradigm into groups of LH(+) (i.e. animals which did not escape footshock) and LH(-) animals.(More)
This study was undertaken to investigate the effects induced by the systemic administration of RB 101 [N-[(R,S)-2-benzyl-3[(S)(2-amino-4-methylthio)butyl dithio]-1-oxoprpyl]-L-phenylalanine benzyl ester], a mixed inhibitor of the enkephalin catabolism able to cross the blood-brain barrier, in antinociception produced by adrenal medullary tissue transplanted(More)
While the effects of cytokines on the hypothalamo-pituitary-adrenal axis have received a great deal of attention in recent years the effects of cytokines on posterior pituitary hormone release has been less well characterized. In the present study we have investigated the effects of a single i.p. injection of interleukin (IL)-1 beta on circulating levels of(More)
The development of adjuvant-induced arthritis in the rat is associated with an activation of the hypothalamo-pituitary-adrenal axis. In the Piebald-Viral-Glaxo strain of rat there is however a paradoxical decrease in corticotrophin-releasing factor (CRF) mRNA in the hypothalamic paraventricular nucleus (PVN) and a decrease in CRF-41 peptide release into the(More)
We have utilized the open field and learned helplessness (LH) models of psychological stress to determine whether a differential response to stress can affect the severity of adjuvant-induced arthritis (AA) within a single rat strain. In response to open field stress, the corticosterone response of the low emotivity rats was significantly lower than that of(More)
It has been suggested that glucocorticoid insufficiency consequent to a blunted hypothalamo-pituitary-adrenal (HPA) axis response to stress may be associated with increased susceptibility to certain experimentally induced autoimmune diseases. We have developed a model which allows this hypothesis to be tested within a single population of rats, using the(More)
We have previously demonstrated that Gram-negative bacterial endotoxin can exert long-term protective effects against the chronic inflammatory disease adjuvant arthritis in rats. The present study was designed to investigate the mechanisms and time-course of hypothalamo-pituitary-adrenocortical (HPA) axis activity and cytokine secretion underlying this(More)