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使用定制的喂养系统操纵小鼠的节律食物摄入
使用定制的喂养系统操纵小鼠的节律食物摄入
JoVE Journal
Biology
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JoVE Journal Biology
Manipulation of Rhythmic Food Intake in Mice Using a Custom-Made Feeding System

使用定制的喂养系统操纵小鼠的节律食物摄入

Full Text
2,836 Views
07:34 min
December 16, 2022

DOI: 10.3791/64624-v

Aishwarya Sahasrabudhe1,2, Chanté R. Guy1,2, Ben J. Greenwell1,2,3, Jerome S. Menet1,2,3

1Department of Biology,Texas A&M University, 2Center for Biological Clocks Research,Texas A&M University, 3Interdisciplinary Program of Genetics,Texas A&M University

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Please note that some of the translations on this page are AI generated. Click here for the English version.

Overview

This study explores the impact of timing food intake as a strategy to mitigate diet-induced metabolic diseases using an innovative food delivery system for mice. The system allows for controlled feeding schedules, enabling researchers to assess dietary effects on physiology with high precision.

Key Study Components

Research Area

  • Diet-induced metabolic diseases
  • Rhythmic food intake
  • Mice as model organisms

Background

  • Importance of feeding timing in metabolic health
  • Existing limitations of current feeding studies
  • Benefits of a customized feeding system

Methods Used

  • In-house constructed food delivery system
  • Mice as the biological model
  • Controlled feeding regimens (ad libitum, time-restricted, arrhythmic)

Main Results

  • Mice on a night-restricted diet adjusted their food consumption patterns significantly
  • Weight changes correlated with dietary conditions and feeding rhythms
  • The system proved effective in measuring and manipulating intake rhythms

Conclusions

  • This study demonstrates that controlled timing of food intake can influence metabolic outcomes in mice
  • The findings have implications for understanding dietary interventions in metabolic disease research

Frequently Asked Questions

What is the primary aim of this study?
To investigate how regulating food intake timing can mitigate metabolic diseases in mice.
What kind of feeding schedules were used?
The study utilized ad libitum, time-restricted, and arrhythmic feeding schedules.
How does the feeding system work?
The system controls food delivery to align with specific feeding regimens and tracks food consumption.
What were the main findings regarding weight changes?
Mice showed significant weight gain when transitioned to night-restricted and arrhythmic diets.
What materials were used to construct the feeding system?
The system was made from affordable materials, including PVC sheets and a timer.
Why is controlling food timing important?
Controlling food timing can provide insights into the relationship between diet patterns and metabolic health.
Is this system difficult to implement?
No, the system is designed to be low-cost and user-friendly for researchers.

限制食物摄入的时间已成为减轻饮食引起的代谢疾病的有希望的干预措施。这份手稿详细介绍了内部构建的高效系统的构建和使用,该系统用于测量和操纵小鼠有节奏的食物摄入量。

限制食物摄入的时间已成为减轻饮食引起的代谢疾病的有希望的干预措施。该协议详细介绍了内部构建的高效系统的构建和使用,用于测量和操纵小鼠的有节奏的食物摄入量。该系统的主要优点是它是一个低成本和高效的系统,可以使用负担得起的材料构建,同时用户友好。

该系统可用于以不同的喂养方案喂养小鼠,例如随意,时间限制或心律失常时间表,并且可以结合高脂肪饮食来研究它们对生理的影响。首先,采购四片 0.25 英寸 PVC 片材。切割并粘合四块PVC以获得底座。

接下来,打开计时器以拔下插头,并使用标准延长线或电源线进行连接。将计时器放在 PVC 底座上,使其与钻入其中的孔对齐,并使用 1.5 英寸螺钉固定。在计时器顶部钻四个孔,并固定 0.75 英寸螺钉以固定八格食品容器。

使用宽度大于 4.5 英寸的鼠笼,并使用孔锯在笼子底部切一个 4.5 英寸的孔。然后使用四英寸、八格的珠宝整理器制作食物分配器。切开容器的边缘,使其很好地融入管道。

使用四英寸的 PVC 管帽并切一个对应于单个分配器隔间大小的孔,以创建一个一次仅露出八个隔间中的一个的开口。设置完所有保持架后,即可完成最终设置。为了便于运输,取三根0.25英寸的PVC管,在两块的中心钻一个0.625英寸的孔,然后将它们粘在一起。

然后将 0.625 英寸的 PVC 管穿过它们。然后可以将食物杯堆叠在此组件上。在引入鼠标之前,通过将设置插入电源插座来评估计时器。

在记录的时间将一块巢穴放在一个隔间中,并在六小时后监控巢穴的位置,以确保计时器及时转动。如手稿中所述,将鼠标转移到实验室并使它们适应明暗循环组。在将小鼠单独放入饲养笼之前记录小鼠重量,并确保小鼠可以随意获得水、床上用品和巢穴。

将 1.5 克食物添加到喂食杯的所有八个隔间中,并将喂食器杯放在计时器上。然后将盖子放在进纸器杯上,这样只有一个隔间暴露出来。四个隔间表示白天点,其他四个隔间表示夜间点。

每天在同一时间更换食物,并计算每个隔间中剩余的颗粒数量以计算消耗的食物量。监测一周的喂养情况,以获得随意喂养和夜间限制饮食的小鼠的基线喂养曲线。在随意饮食三到七天后,通过逐渐减少日间隔室中的颗粒数量,将小鼠置于过渡饮食中。

在小鼠适应夜间限制方案后两周监测食物摄入量。在此期间,调整给每只小鼠的食物量,以更好地适应其总食物消耗量。在两周结束时称量小鼠的体重,以监测由于喂养方案引起的任何体重变化。

经过一周的随意饮食,计算平均每日食物消耗量和每个隔间提供的食物量,如手稿中所述。通过确保小鼠全天在所有八个隔室中获得等量的食物来实现心律失常喂养。然后通过逐渐减少每个隔间的食物量来使小鼠进行过渡饮食,在三到五天内,以消除任何食物摄入的节奏。

在心律失常饮食期间,每天调整食物,以确保小鼠只留下少量颗粒并获得适量的食物。按照稿件中的描述进行调整。为了监测由于喂养方案引起的任何体重变化,请在两周结束时称量小鼠。

喂养曲线表明,随意喂食正常食物的野生型小鼠在夜间吃掉了大约75%的食物。随意喂食高脂肪饮食的小鼠在暴露的前两天吃了更多的食物,可能是因为高脂肪饮食的新颖性。每三小时平均食物摄入量。

用正常食物或高脂肪饮食喂养的小鼠在白天和晚上的平均食物摄入量和百分比是相当的。雄性小鼠在随意正常食物和高脂肪饮食一周后体重显着增加。过渡到夜间限制饮食的小鼠仅在夜间摄入每日总卡路里,前三到五周的卡路里摄入量没有显着减少。

过渡到心律失常饮食的小鼠在一天中消耗了等量的每日总卡路里,极大地抑制了它们的日常食物摄入节奏。小鼠在夜间限制和心律失常喂养方案后显示体重增加。使用此进料系统时要记住的最重要的事情是确保计时器在整个实验过程中正常运行。

使用这种喂养系统,研究人员可以根据他们的要求定制食物交付,这最终可以帮助他们回答有关不同进餐时间对健康和疾病的影响的问题。

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