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Preference for dietary fat induced by release of beta-endorphin in rats

机译:偏好由大鼠释放β-内啡肽诱导的饮食脂肪

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Aims: To determine whether beta-endorphin contributes to the ingestion of and preference for dietary oil, we examined the relationship between the dynamics of beta-endorphin, before and after the ingestion of corn oil, and the intake volume of corn oil.Main methods: Rats were offered 5% corn oil for 20 min for 5 consecutive days so they could acquire a preference for corn oil. On day 6, seven groups of rats were presented with the oil for defined time periods, and we measured the beta-endorphin levels in the serum and cerebrospinal fluid (CSF) before and after the presentation of corn oil as well as the consumed volume of corn oil at defined time points.Key findings: Beta-endorphin levels in serum and CSF were significantly increased 15 min after the ingestion of corn oil, followed by a rapid decrease and maintenance at the basal level throughout the rest of the experimental period. The intake of corn oil was the lowest in the time period of 15-30 min, when the beta-endorphin level reached a peak value. The intake volume of corn oil might be inversely correlated with beta-endorphin levels in serum and CSF. The pretreatment of naloxone, an antagonist of the opioid receptor, decreased the initial licking rate for corn oil and increased the latency for corn oil in the licking test. Significance: The beta-endorphin was rapidly released after oil ingestion, which contributed to the hedonic preference and ingestive behavior for fat.
机译:目的:为了确定β-内啡肽是否有助于饮食和对膳食油的摄入,我们研究了玉米油摄入前后β-内啡肽的动力学与玉米油摄入量之间的关系。 :连续5天为大鼠提供5%玉米油,持续20分钟,这样他们可以偏爱玉米油。在第6天,在规定的时间段内给七组大鼠喂食油,我们测量了在喂食玉米油前后的血清和脑脊液(CSF)中的β-内啡肽水平以及所消耗的关键发现:摄入玉米油15分钟后,血清和CSF中的β-内啡肽水平显着升高,随后在整个实验期的剩余时间内迅速降低并维持在基础水平。当β-内啡肽水平达到峰值时,玉米油的摄入量在15-30分钟内最低。玉米油的摄入量可能与血清和脑脊液中的β-内啡肽水平成反比。阿片受体拮抗剂纳洛酮的预处理降低了玉米油的初始舔食率,并增加了舔食试验中玉米油的潜伏期。启示:吸油后,β-内啡肽迅速释放,这有助于享乐主义者对脂肪的偏爱和摄取行为。

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