Sina Taghvimi; Marzieh Asadi; Homayoun Khazali
Abstract
Previous studies have shown that ghrelin inhibits the activity of Hypothalamus-Pituitary-Thyroid (H-P-T) axis. It is also proved that ghrelin increases the appetite via Agouti Related Protein and neuropeptide Y Pathway, decreases T3 and T4 secretion. Also morphine by effect on Pituitary hormones like ...
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Previous studies have shown that ghrelin inhibits the activity of Hypothalamus-Pituitary-Thyroid (H-P-T) axis. It is also proved that ghrelin increases the appetite via Agouti Related Protein and neuropeptide Y Pathway, decreases T3 and T4 secretion. Also morphine by effect on Pituitary hormones like TSH decreases T3 and T4 concentrations. Thus, the goal of this study was to determine the influence of the interaction between ghrelin and morphine on thyroid hormones concentration. Twenty one male Wistar rats weighing 200-250 g were randomly divided into 3 groups. The groups received 5 nmol ghrelin, 1µg morphine or 5 nmol ghrelin together with 1µg morphine in third cerebral ventricle in volumes of 3 μl .The blood samples were collected every day. Starting one day before and up to one day after injections. Brain slices were taken to ensure that the place of the canulae was right. The plasma was analysed by Radioimmunoassay technique to determine T3 and T4 concentrations. The results showed that the i.c.v injection of ghrelin and morphine significantly decreased the mean plasma concentrations of thyroid hormones (P<0.05). Co-administration of these two substances in some of groups showed that decrease mean plasma concentrations of thyroid hormones (P<0.05). This study showed that ghrelin and morphine significantly decreased mean plasma concentration of T3 and T4. Co-administration of two substances in some of groups showed that decrease mean plasma concentration of thyroid hormones (p<0.05).
Homayoun Khazali; Nazli khajehnasiri; Farzam Sheikhzadeh Hesari
Abstract
Abstract Location of two sets of neurons; pro-opiomelanocortin (POMC) and neuropeptide Y (NPY) in the arcuate nucleus of the hypothalamus, represents a core role of the hypothalamus in the regulation of energy balance. One of the important factors in energy balance is exercise. Until now, the effects ...
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Abstract Location of two sets of neurons; pro-opiomelanocortin (POMC) and neuropeptide Y (NPY) in the arcuate nucleus of the hypothalamus, represents a core role of the hypothalamus in the regulation of energy balance. One of the important factors in energy balance is exercise. Until now, the effects of exercise on hypothalamic POMC and NPY genes expression, weight and appetite control are not clear. Therefore, in the present study, the influence of one-month regular moderate exercise in serum level of corticosterone, as one of the factors affecting appetite, and gene expression of hypothalamic POMC and NPY were discussed.Fourteen adult male Wistar rats were randomly divided into control and one-month regular moderate exercise (RME) groups. After, one-month exercise (22m/min), the arcuate nucleus was isolated from brain and stored in -80 refrigerators for gene expression assay by real-time PCR method. In addition, serum samples were taken to assess corticosterone level by ELISA method. Data were analyzed by Independent t-test in SPSS-16. Pro-opiomelanocortin mRNA level was lower in the group which received exercise less than the control animal (P. The results of the present study indicate that regular moderate exercise is effective in reducing stress but probably increasing anorexigenic neuropeptide, proopiomelanocortin, gene expression is the reason for incapacitation of exercise for losing weight.
