A detailed review of their own experiments and of data existing in the literature regarding the role played by 5HT in the control of circadian rhythms of HHAA and HHPA is given by the AA. In rats, a positive correlation between 5-HT content in the limbic system and plasma corticosterone circadian rhythm has been shown to exist by means of pharmacological and neurosurgical approaches. Lesions of...

Receptor-mediated cholesterol uptake has been suggested to play a role in maintaining the adrenal intracellular free cholesterol pool and the ability to produce hormones. Therefore, in the current study, we evaluated the importance of scavenger receptor class B type I (SR-BI)-mediated cholesteryl ester uptake from HDL for adrenal glucocorticoid hormone synthesis in vivo. No difference was obser...

Clinical findings suggest that inflammatory disease symptoms are aggravated by ongoing, repeated stress, but not by acute stress. We hypothesized that, compared with single acute stressors, chronic repeated stress may engage different physiological mechanisms that exert qualitatively different effects on the inflammatory response. Because inhibition of plasma extravasation, a critical component...

The main goal of this study was to evaluate the possible effect of whole-body magnetic field (MF) exposure on the variations of corticosterone, Free-T3, Free-T4 and malonyl dialdehyde in plasma in 48 adult white New Zealand male rabbits. Animals were divided into six groups namely, C1 (normal diet, not exposed), C2 (normal diet, sham exposed), T1 (normal diet, exposed to electromagnetic field),...

We examined the selective consequences of variation in behaviour and endocrine physiology in two female throat-colour morphs of the lizard, Uta stansburiana in the wild. Female morphs differed in home-range distribution patterns and corticosterone levels in relation to the density and frequency of their female neighbours. Levels of plasma corticosterone of yellow-throated females increased with...

Effects of 2-buten-4-olide (2-B4O), an endogenous satiety substance, on levels of plasma glucose, corticosterone, and catecholamines were examined in fed, conscious, and unrestrained rats. A vascular indwelling catheter was inserted into the right atrium of the animal from the jugular vein 1 wk before the experiment. Injection of 2-B4O and blood sampling were performed through the catheter in a...

Individuals born with a low birth weight (LBW) have an increased prevalence of type 2 diabetes, but the mechanisms responsible for this association are unknown. Given the important role of insulin resistance in the pathogenesis of type 2 diabetes, we examined insulin sensitivity in a rat model of LBW due to intrauterine fetal stress. During the last 7 days of gestation, rat dams were treated wi...

After the administration of 3Hand 14C-cholesterol to rats 3 days and 4 hr prior to their death respectively, ester and free cholesterol in adrenal glands were successfully labeled separately with different isotopes. Examination of the 3H/14C ratio in free and ester cholesterol of adrenal glands and in plasma corticosterone enabled us to study of the role of ester cholesterol in corticosteroidog...

introduction: celastrus paniculatus seed oil, commonly known as malkangni or jyotishmati, was in use from time immemorial to treat brain related disorders. celastrus paniculatus seed oil has significant antidepressant-like activity in chronic unpredictable stressed mice. the present study was undertaken to evaluate the antidepressant-like effect of celastrus paniculatus seed oil in unstressed m...

Apnea, the temporary cessation of respiratory airflow, is a common cause of intermittent hypoxia (IH) in premature infants. We hypothesized that IH elicits a stress response and alters glucose homeostasis in the neonatal rat. Rat pups were studied on postnatal day (PD) 2, 8, 10, 12, and 14. Pups were exposed to normoxia (control) or six cycles consisting of 30-s exposures to hypoxia (FiO2 = 3%)...