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Orexins are hypothalamic neuropeptides that regulate feeding, energy expenditure, and sleep. Although orexin-deficient mice are susceptible to obesity, little is known about the roles of the orexin receptors in long-term energy metabolism. Here, we performed the metabolic characterization of orexin receptor-deficient mice. Ox1r-deficient mice were resistant to diet-induced obesity, and their food intake was similar between chow and high-fat food. Ox2r-deficient mice exhibited less energy expenditure than wild-type mice when fed a high-fat diet. Neither Ox1r-deficient nor Ox2r-deficient mice showed body weight gain similar to orexin-deficient mice. Although the presence of a running wheel suppressed diet-induced obesity in wild-type mice, the effect was weaker in orexin neuron-ablated mice. Finally, we did not detect abnormalities in brown adipose tissues of orexin-deficient mice. Thus, each orexin receptor signaling has a unique role in energy metabolism, and orexin neurons are involved in the interactive effect of diet and exercise on body weight gain.
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Alcohol use is frequently associated with mood disorders. Similarly, individuals suffering from these disorders have a higher risk of developing alcoholism. Several reports have implicated orexin sign...
Orexin receptor antagonists are clinically useful for treating insomnia, but thorough blockade of orexin signaling could cause narcolepsy-like symptoms. Specifically, while sleepiness is a desirable e...
Wnt signaling pathways are largely divided into the β-catenin-dependent canonical pathway and β-catenin-independent non-canonical pathways. The roles of Wnt signaling in bone metabolism have been ex...
Cognitive processes contribute to the control of feeding behavior and help organism's survival when they support physiological needs. They can become maladaptive, such as when learned food cues drive ...
Orexin is a peptide neurotransmitter released in the globus pallidus. Morphological evidence reveals that both orexin 1 receptor (OXR) and orexin 2 receptor (OXR) exist in the globus pallidus. Here we...
Suvorexant (trade name Belsomra) is an orexin receptor antagonist that has TGA approval for the treatment of insomnia, characterised by difficulties with sleep onset and/or sleep maintenan...
Tobacco smoking continues to be the primary cause of preventable mortality in the United States. Despite the availability of smoking cessation aids, the majority of those trying to quit sm...
Post-traumatic stress disorder (PTSD) is a common consequence of combat that can result in trauma-related hyperarousal and sleep disturbances. Poor sleep, one of the most common complaints...
Summary of Study Protocol. This project is designed to test neurobehavioral mechanisms underlying effects of the dual orexin-1/2 receptor antagonist suvorexant on sleep efficiency and opio...
Links between orexin and amyloid processes have been underlined recently. During the Alzheimer's process an upregulation of the orexin mechanism has been observed. The pathophysiological m...
G-protein-coupled NEUROPEPTIDE RECEPTORS that have specificity for OREXINS and play a role in appetite control, and sleep-wake cycles. Two principle receptor types exist, each having a specificity for OREXIN A and OREXIN B peptide subtypes.
Substances that bind to and inhibit the action of OREXIN RECEPTORS. Drugs in this class have been used as SLEEP AIDS.
A secreted protein of approximately 131 amino acids that is related to AGOUTI SIGNALING PROTEIN and is also an antagonist of MELANOCORTIN RECEPTOR activity. It is expressed primarily in the HYPOTHALAMUS and the ADRENAL GLAND. As a paracrine signaling molecule, AGRP is known to regulate food intake and body weight. Elevated AGRP has been associated with OBESITY.
PKC beta encodes two proteins (PKCB1 and PKCBII) generated by alternative splicing of C-terminal exons. It is widely distributed with wide-ranging roles in processes such as B-cell receptor regulation, oxidative stress-induced apoptosis, androgen receptor-dependent transcriptional regulation, insulin signaling, and endothelial cell proliferation.
A suppressor of cytokine signaling protein that consists of an N-terminal kinase-inhibitory region, a central SH2 DOMAIN, a characteristic C-terminal SOCS box (a 40-amino acid motif, which functions to recruit E3 UBIQUITIN-PROTEIN LIGASE COMPLEXES). SOCS3 inhibits cytokine signaling by binding to RECEPTOR PROTEIN-TYROSINE KINASES as well as CYTOKINE RECEPTOR GP130; ERYTHROPOIETIN RECEPTORS; INSULIN RECEPTOR; and the LEPTIN RECEPTOR. Its functions include suppression of ERYTHROPOIESIS in the fetal liver.
Women's Health - key topics include breast cancer, pregnancy, menopause, stroke Follow and track Women's Health News on BioPortfolio: Women's Health News RSS Women'...
Diabetes Diabetes Endocrine Disorders Obesity Oxycontin Renal Disease Thyroid Disorders Endocrinology is the study of the endocrine glands and the hormones that they secrete (Oxford Medical Dictionary). There are several g...
Sleep disorders disrupt sleep during the night, or cause sleepiness during the day, caused by physiological or psychological factors. The common ones include snoring and sleep apnea, insomnia, parasomnias, sleep paralysis, restless legs syndrome, circa...