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C57BL/6J小鼠的葡萄糖偏好:非营养性甜味剂体验、食物剥夺状态及性别差异的影响

Glucose appetition in C57BL/6J mice: Influence of nonnutritive sweetener experience, food deprivation state and sex differences.

作者信息

Sclafani Anthony, Ackroff Karen

机构信息

Department of Psychology, Brooklyn College of the City University of New York, Brooklyn, NY 11210, USA.

Department of Psychology, Brooklyn College of the City University of New York, Brooklyn, NY 11210, USA.

出版信息

Physiol Behav. 2024 Sep 1;283:114596. doi: 10.1016/j.physbeh.2024.114596. Epub 2024 May 28.

Abstract

In addition to its sweet taste, glucose has potent and rapid postoral actions (appetition) that enhance its reward value. This has been demonstrated by the experience-induced preference for glucose over initially preferred nonnutritive sweetener solutions in 24-h choice tests. However, some sweetener solutions (e.g., 0.8% sucralose) have inhibitory postoral actions that may exaggerate glucose appetition whereas others (e.g., 0.1% sucralose + 0.1% saccharin, S+S) do not. Experiment 1 revealed that food-restricted (FR) male C57BL/6J mice displayed similar rapid glucose appetition effects (stimulation of glucose licking within minutes) and conditioned flavor preferences following 1-h experience with flavored 0.8% sucralose or 0.1% S+S and 8% glucose solutions. Thus, the inhibitory effects of 0.8% sucralose observed in 24-h tests were not apparent in 1-h tests. Experiment 2 evaluated the effects of food deprivation state and sweetener concentration on glucose appetition in female mice. Unlike FR mice tested with 0.1% S+S and 8% glucose, ad libitum (AL) fed mice displayed no stimulation of 8% glucose licking in the 1-h tests. A second ad libitum group (AL) tested with 0.2% S+S and 16% glucose solutions displayed stimulation of 16% glucose licking by the third 1-h test. Both AL groups, like the FR group, developed a preference for the glucose-paired flavor over the S+S paired flavor. Thus, food restriction promotes increased glucose licking but is not required for a conditioned preference. The FR male mice (Exp. 1) and FR female mice (Exp. 2) showed similar appetition responses (licking stimulation and flavor preference) to 8% glucose.

摘要

除了甜味之外,葡萄糖还具有强大且迅速的口服后作用(食欲增强作用),可提高其奖赏价值。这一点已在24小时选择测试中通过经验诱导的对葡萄糖的偏好超过最初偏好的非营养性甜味剂溶液得到证明。然而,一些甜味剂溶液(例如0.8%的三氯蔗糖)具有抑制性的口服后作用,可能会夸大葡萄糖的食欲增强作用,而其他一些(例如0.1%的三氯蔗糖+0.1%的糖精,S+S)则不会。实验1表明,食物受限(FR)的雄性C57BL/6J小鼠在接触加味的0.8%三氯蔗糖或0.1% S+S以及8%葡萄糖溶液1小时后,表现出类似的快速葡萄糖食欲增强作用(几分钟内刺激葡萄糖舔舐)和条件性风味偏好。因此,在24小时测试中观察到的0.8%三氯蔗糖的抑制作用在1小时测试中并不明显。实验2评估了食物剥夺状态和甜味剂浓度对雌性小鼠葡萄糖食欲增强作用的影响。与用0.1% S+S和8%葡萄糖测试的FR小鼠不同,自由进食(AL)的小鼠在1小时测试中未表现出对8%葡萄糖舔舐的刺激。另一个自由进食组(AL)用0.2% S+S和16%葡萄糖溶液进行测试,在第三次1小时测试时表现出对16%葡萄糖舔舐的刺激。两个AL组与FR组一样,对与葡萄糖配对的风味产生了比对与S+S配对的风味更强的偏好。因此,食物限制会促进葡萄糖舔舐增加,但形成条件性偏好并不需要食物限制。FR雄性小鼠(实验1)和FR雌性小鼠(实验2)对8%葡萄糖表现出相似的食欲增强反应(舔舐刺激和风味偏好)。

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