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

机译:在大鼠中释放β-内啡肽诱导的膳食脂肪的偏好

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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-内啡肽是否有助于摄取和膳食油的偏好,我们检查了玉米油摄入前后β-内啡肽的动态与玉米油的进气量的关系。 :连续5天为5%玉米油提供5%玉米油,因此它们可以获得玉米油的偏好。在第6天,用油含有七组大鼠用于定义的时间段,我们在玉米油呈现之前和之后测量血清和脑脊液(CSF)中的β-内啡肽水平以及消耗的体积玉米油在定义的时间点。在玉米油摄取后,血清和CSF中的β-内啡肽水平显着增加15分钟,然后在实验期间的其余部分在基础水平上进行快速降低和维护。当β-内啡肽水平达到峰值时,玉米油的摄入量是15-30分钟的最低时间。玉米油的进气量可能与血清和CSF中的β-内啡肽水平相反。阿片类受体的拮抗剂的预处理降低了玉米油的初始舔率,并增加了玉米油在舔药中的潜伏期。意义:β-内啡肽在油摄取后迅速释放,这导致脂肪偏好和脂肪的摄取行为。

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