Urocortins Brain CRF2 Receptors and Energy Balance

尿皮质素大脑 CRF2 受体和能量平衡

• 批准号: 7148193
• 负责人: ERIC P ZORRILLA
• 金额: $ 35.16万
• 依托单位: SCRIPPS RESEARCH INSTITUTE, THE
• 依托单位国家: 美国
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-15 至 2011-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7148193
• 关键词: adipose tissue; appetite; behavioral /social science research tag; bioenergetics; brain metabolism; corticotropin releasing factor; hormone receptor; injection /infusion; insulin; laboratory rat; leptin; metabolomics; microinjections; neuropeptides; neuropharmacology; nutrient intake activity; nutrition related tag; operant conditionings; overeating

DESCRIPTION (provided by applicant): Type 2 urocortins, novel ligands for corticotropin-releasing factor type 2 (CRF2) systems, retain their central anorectic properties in rats fed an energy dense "cafeteria" diet composed of palatable high fat and refined carbohydrate foods. This finding is promising because developing insensitivity to anorectics is an obstacle to obesity treatment. The present application hypothesizes that brain corticotropin- releasing factor type 2 (CRF2) systems are downstream components of the endogenous counter-regulatory system that curbs body weight gain. Acute and chronic effects of intracranial infusion of selective CRF2 ligands will be studied in rat lines selectively bred for differential vulnerability to diet-induced obesity. Neuropharmacologic studies will be performed under different dietary conditions, some of which promote obesity, to determine whether the anorectic properties of type 2 urocortins are retained despite obesity risk, high-fat diet history or manifest obesity. Indirect calorimetry and pair-feeding studies will examine metabolic components of the body weight-altering effects of CRF2 ligands in relation to genotype and diet with brain- site specificity. Long-term effects of continuous, intra-parenchymal CRF2 ligand treatment on adiposity and glucose regulation will be compared in treatment-free states. The role of CRF receptors in the energy balance-related effects of central leptin and insulin infusion will be tested using subtype-specific antagonists. Innovative forms of microstructure analysis and progressive schedules of operant responding will be used to identify the behavioral construct through which type 2 urocortins control food intake. Alternative explanations, such as malaise, will be considered. The proposed studies would identify general and brain CRF receptor- related differences in feeding patterns and metabolism that are associated with obesity and diet history. Relevance: Effective obesity treatments are few in part because obese individuals become resistant to biological signals that otherwise help regulate body weight. Brain mechanisms that can still promote weight loss in obese individuals and those with access to palatable foods are of great public health interest. The present application uses new pharmacological tools to study the role of a recently identified neuropeptide system in the control of body weight, via changes in appetite and metabolism, findings which may identify a therapeutic target for the treatment of obesity and its related medical complications.

描述（由申请人提供）：2 型尿皮质素是 2 型促肾上腺皮质激素释放因子 (CRF2) 系统的新型配体，在喂食由可口的高脂肪和精制碳水化合物食物组成的能量密集“自助餐厅”饮食的大鼠中，保留其中枢厌食特性。这一发现很有希望，因为对厌食剂不敏感是肥胖治疗的障碍。本申请假设脑促肾上腺皮质激素释放因子2型(CRF2)系统是抑制体重增加的内源性反调节系统的下游组件。颅内输注选择性 CRF2 配体的急性和慢性影响将在针对饮食诱导肥胖的不同易感性而选择性培育的大鼠品系中进行研究。神经药理学研究将在不同的饮食条件下进行，其中一些饮食条件会促进肥胖，以确定尽​​管有肥胖风险、高脂肪饮食史或明显肥胖，2 型尿皮质素的食欲特性是否仍保留。间接量热法和配对喂养研究将检查 CRF2 配体体重改变效应的代谢成分与基因型和具有脑部位特异性的饮食的关系。将在无治疗状态下比较连续实质内 CRF2 配体治疗对肥胖和血糖调节的长期影响。 CRF 受体在中枢瘦素和胰岛素输注的能量平衡相关作用中的作用将使用亚型特异性拮抗剂进行测试。微观结构分析的创新形式和操作反应的渐进时间表将用于识别 2 型尿皮质素控制食物摄入的行为结构。将考虑其他解释，例如不适。拟议的研究将确定与肥胖和饮食史相关的喂养模式和新陈代谢的一般差异和大脑 CRF 受体相关差异。相关性：有效的肥胖治疗方法很少，部分原因是肥胖个体对有助于调节体重的生物信号产生了抵抗力。仍然可以促进肥胖者和那些能够获得美味食物的人减肥的大脑机制具有重大的公共健康意义。本申请使用新的药理学工具来研究最近鉴定的神经肽系统通过改变食欲和新陈代谢在控制体重中的作用，这些发现可能确定治疗肥胖及其相关医学并发症的治疗靶点。