The mechanisms regulating leptin secretion were investigated in isolated rat white adipocytes. Insulin (1-100 nM) linearly stimulated leptin secretion from incubated adipocytes for at least 2 h. The adrenergic agonists norepinephrine, isoproterenol (two nonselective beta-agonists), or CL-316243 (potent beta3) all inhibited insulin (10 nM)-stimulated leptin release. The inhibitory effects of nor...

The present study tested the hypothesis that the Janus kinase 2, Src tyrosine kinases, and mitogen-activated protein kinase interact to regulate lordosis behavior induced by leptin in ovariectomized, estrogen-primed rats. The role of protein kinase A and protein kinase C in lordosis facilitation by leptin was also assessed. In experiment 1, the intracerebroventricular administration of leptin t...

Leptin receptor dysfunction results in overeating and obesity. Leptin regulates hypothalamic signaling that underlies the motivation to hyperphagia, but the interaction between leptin and cannabinoid signaling is poorly understood. We evaluated the role of cannabinoid 1 receptors (CB(1)R) in overeating and the effects of food deprivation on CB(1)R in the brain. One-month-old Zucker rats were di...

AIM To compare cardiometabolic risk-related biochemical markers and sexual hormone and leptin receptors in the adrenal gland of rat males, non-ovariectomized females (NON-OVX), and ovariectomized females (OVX) under chronic stress. METHODS Forty six 16-week-old Sprague-Dawley rats were divided into male, NON-OVX, and OVX group and exposed to chronic stress or kept as controls. Weight, glucose...

background: citrus aurantium is a small citrus tree, with scented white flowers. the c. aurantium is used in asian herbal medicine primarily to treat digestive problems. objective: the goal of this study is to investigate the effect of c. aurantium flower's aqueous extract on uterine contraction in presence of some known uterus stimulants. materials and methods: in experimental study 30 virgin ...

the aim of this study was to investigate the effect of acute swimming stress on plasma corticosterone and leptin levels in female and male rats. thirty- seven adult male (n=20) and female (n=20) sprague dawley rats (200-250 g weight) were used. the leptin and corticosterone levels were measured following swimming stress (10 minutes) or no stress. plasma leptin and corticosterone were measured b...

background: obesity is pandemic worldwide and a strong risk factor for cardio-metabolic disorders. the few approved anti-obesity drugs have poor efficacy and safety profile. thus, there is an urgent need for new anti-obesity agents. according to the traditional medicine and a clinical trial, saffron may have anorexigenic and anti-obesity effects which need further investigation. objectives: eva...

In the adult brain, leptin regulates energy homeostasis primarily via hypothalamic circuitry that affects food intake and energy expenditure. Evidence from rodent models has demonstrated that during early postnatal life, leptin is relatively ineffective in modulating these pathways, despite the high circulating levels and the presence of leptin receptors within the central nervous system. Furth...

Incubation of rat hepatocytes with epinephrine inhibited alanine aminotransferase (ALT) (80%) and aspartate aminotransferase (AST) (53%) activities with no effect on lactate dehydrogenase (LDH) activity. Injection of epinephrine caused a progressive increase with time in hepatic LDH activity, being 52% at 24 h. Preinjection with propranolol eliminated the hormone effect and caused further ...

Effects of the optical isomers of propranolol on blood pressure in the rat, and in the spinal rat during adrenaline infusion were studied to investigate the mechanism of the pressor action of propranolol. Both isomers of propranolol produced a sustained pressor action in the rat and in the spinal rat infused with adrenaline. The magnitude of the pressor action produced by the d- and 1-propranol...