background: leptin is an adipokine that circulates in a free form and bound to a soluble leptin receptor. patients with polycystic ovary syndrome have increased insulin resistance and high incidence of obesity. objective: this study was carried out to evaluate levels of leptin and free leptin in women with polycystic ovarian syndrome (pcos) and note any relationships with insulin resistance and...

background: leptin and its receptor are present in spermatozoa; however, the role of leptin in sperm function is still controversial. our present study aimed at demonstrating the effect of cryopreservation on sperm dna fragmentation (dnaf) and investigating the possible effects of sperm capacitation techniques and leptin in vitro incubation on frozen-thawed sperm dnaf and oxidative stress. meth...

conclusions overall, the results of this study indicate that intermittent exercise reduces the plasma leptin level. in addition, this reduction is significantly correlated to the glucose level in the blood. the continuous exercise was shown to have no effects on the plasma leptin level, and there was no relationship between the glucose and leptin levels. results the results demonstrated that se...

Osteoporosis is a systemic skeletal disease and there is a close relationship between the sympathetic nervous system (SNS) and bone metabolism. Leptin has been shown to regulate bone formation and bone resorption via the SNS. However, the effect of SNS on leptin signaling has not been clearly understood. In the present study, we studied the effect of propranolol on ovariectomy-induced osteoporo...

Hypothalamic homeostatic and forebrain reward-related genes were examined in the context of scheduled meal feeding without caloric restriction in C57BL/6 mice. Mice fed ad libitum but allowed access to a palatable high-fat (HF) diet for 2 hours a day rapidly adapted their feeding behaviour and consumed approximately 80% of their daily caloric intake during this 2-hour scheduled feed. Gene expre...

The central melanocortin system plays a key role in the regulation of energy homeostasis. Neurons containing the peptide precursor proopiomelanocortin (POMC) are found at two sites in the brain, the arcuate nucleus of the hypothalamus (ARC) and the caudal region of the nucleus of the solitary tract (NTS). ARC POMC neurons, which also express cocaine- and amphetamine-regulated transcript (CART),...

Estradiol participates in the control of energy homeostasis, as demonstrated by an increase in food intake and in body weight gain after ovariectomy in rats. In the present study, female Wistar rats (200-230 g, N = 5-15 per group), with free access to chow, were individually housed in metabolic cages. We investigated food intake, body weight, plasma leptin levels, measured by specific radioimmu...

introduction: leptin is a hormone resulting from the obesity gene which could be important in the pathogenesis of the insulin. only limited data concerning the interaction of insulin, glucose tolerance and free leptin are available and no data exist on the potential influence of free vs. bound circulating leptin. we, therefore, studied percentage of free to total leptin in diabetic patients. ma...