Observations suggest that corticosterone, the principal glucocorticoid hormone in the rat, can modulate the behavioral effects of drugs of abuse. In this report, the influence of corticosterone on intravenous self-administration of cocaine was studied. In the first experiment, cocaine intravenous self-administration in adrenalectomized rats and in adrenalectomized rats receiving corticosterone ...

Animal vocalizations convey multiple pieces of information about the sender. Some of them are stable, such as identity or sex, but others are labile like the emotional or motivational state. Only a few studies have examined the acoustic expression of emotional state in non-human animals and related vocal cues to physiological parameters. In this paper, we examined the vocal expression of isolat...

The present study consisted of two experiments. The first experiment was conducted to determine the effects of lipoic acid (ALA; 200 mg/kg) on plasma lipids and insulin sensitivity of whole-body tissue in broilers treated with or without corticosterone (5 mg/kg). Chickens received these agents from 2 to 5 weeks of age in a 2 x 2 factorial arrangement. Thereafter, from 39 to 42 d of age, insulin...

Adrenocortical glucocorticoid and androgen secretion is stimulated by exercise. Excesses of these hormones in fetuses can cause abnormalities in development. We measured maternal and fetal plasma corticosterone and androstenedione concentrations in Sprague-Dawley rats immediately after maternal exercise in exercise-trained mothers and at rest in sedentary mothers. To do this, we developed a tec...

The present study investigated the hypothalamic-pituitary-adrenal (HPA) axis activity in response to stress in adult male rats submitted to pituitary stalk compression (PSC) or sham operation. Animals received water or oral salt loading (2% NaCl) for one or eight days before the day of the experiment. On the 14th day post-surgery rats were killed under basal conditions or after 15 min immobiliz...

Glucocorticoids are often measured in wildlife to assess physiological responses to environmental or ecological stress. Hair, blood, saliva, or fecal samples are generally used depending on the timescale of the stress response being investigated and species-specific considerations. Here, we report the first use of hair samples to measure long-term corticosterone levels in the climate-sensitive ...

introduction: in the present study, the effects of oral morphine consumption in pregnant female rats on the amygdaloid complex development in the embryos were investigated. methods: female wistar rats weighing 250-300 g (n=15) were divided into control (n = 8) and experimental groups (n = 7). the experimental group received morphine (0.05 mg/ml) in their tap water. on the 19th day of pregnancy,...

introduction: it has been shown that the extract of elaeagnus angustifolia can inhibit inflammation and pain induced by formalin in mice and rats. the aim of the present study is to reach evaluations of possible cellular and molecular mechanisms of elaeagnus angustifolia extract in reducing pain and inflammation through examining the extract ability for inhibition of cyclooxygenase (cox) type 1...

Transplantation of adrenal cortical tissue may represent an alternative treatment to reestablish glucocorticoid secretion in adrenal insufficiency. In the present work, performed in adrenalectomized rats and adrenalectomized rats with a complete autotransplanted adrenal into the spleen, several hormones and biochemical parameters were measured and compared to control animals, in order to examin...

Comparison of fluorescence intensities of corticosterone and cortisol in a variety of concentrations of sulphuric acid to ethanol has led to the finding that corticosterone gives several times as high fluorescence as cortisol in reagent consist ing of 6:4(v/v) sulphuric acid and ethanol, while it produces low fluorescence in comparison with cortisol in 9:1(v/v) sulphuric acid-ethanol reagent. T...