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High-dose naloxone (1.0 mg/kg): psychological and endocrine effects in normal male subjects pretreated with one milligram of dexamethasone.

Abstract：

:The possible participation of the endogenous opioid system (EOS) in the negative feedback of the hypothalamic-pituitary-adrenal axis (HPA-a) activated by low doses (1 mg) of dexamethasone (Dex) was investigated. Ten male healthy subjects (mean age 31.5 +/- 1.9 SEM) were studied on 2 separate days, in a double-blind, cross-over and placebo-controlled design. All subjects were pretreated with 1.0 mg Dex orally the night (2300 h) before both test days. On the study days, subjects were admitted at 0700 h for cannula insertion; the administration of an i.v. bolus of either naloxone (Nal) (1.0 mg/kg) or saline solution (Sal) i.v. was started at 0900 h. Before and following each infusion, mood was measured by a Visual Analogue Scales (VAS) and by the Affective Quality Scale (AQS) every 30 min and blood samples were taken at 15-min intervals. Blood pressure and heart rate were also monitored. Before Dex administration, plasma cortisol levels were within the normal range in all subjects (210.4 +/- 13 ng/ml), while after 9 h after Dex cortisol levels showed the expected significant (p < 0.01) decrease (11.5 +/- 1.9 and 15.04 +/- 0.7 ng/ml for Sal and Nal test days respectively). There were no detectable increases in plasma cortisol levels following either Nal nor Sal administration. However, there was a Nal-induced significant increase in LH (p < 0.01) thus indicating that an effective opioid blockade at the level of the hypothalamic-pituitary unit occurred. There were also a mild and selective Dex + Nal-induced dysphoric (mood factors related to subjects perception of their cognition) and bradycardic effects (p < 0.05). These results suggest that the EOS is not directly involved in the negative feedback triggered by low doses of Dex of the HPA-a, and that there might be a possible glucocorticoid-opioid interaction for the modulation of some aspects of mood.

journal_name

Psychoneuroendocrinology

journal_title

Psychoneuroendocrinology

authors

Martín-Del-Campo AF,Cortés-Sotres J,Herrera-Ferrá K,Ulloa-Aguirre A

doi

10.1016/s0306-4530(98)00002-x

subject

Has Abstract

pub_date

1998-05-01 00:00:00

pages

413-24

issue

eissn

0306-4530

issn

1873-3360

pii

S0306-4530(98)00002-X

journal_volume

pub_type

临床试验,杂志文章,随机对照试验

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High-dose naloxone (1.0 mg/kg): psychological and endocrine effects in normal male subjects pretreated with one milligram of dexamethasone.