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JoVE Journal
Behavior
信号衰减为强迫症的大鼠模型
信号衰减为强迫症的大鼠模型
JoVE Journal
Behavior
This content is Free Access.
JoVE Journal Behavior
Signal Attenuation as a Rat Model of Obsessive Compulsive Disorder

信号衰减为强迫症的大鼠模型

Full Text
15,948 Views
09:29 min
January 9, 2015

DOI: 10.3791/52287-v

Koral Goltseker*1, Roni Yankelevitch-Yahav*1, Noa S. Albelda*1, Daphna Joel1,2

1School of Psychological Sciences,Tel-Aviv University, 2Sagol School of Neuroscience,Tel-Aviv 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 outlines a protocol to induce compulsive-like behavior in rats, aimed at understanding obsessive-compulsive disorder (OCD). The method involves attenuating signals that indicate successful lever-pressing for food rewards.

Key Study Components

Area of Science

  • Neuroscience
  • Behavioral Psychology
  • Animal Models of OCD

Background

  • Obsessive-compulsive disorder (OCD) is characterized by compulsive behaviors.
  • Animal models are essential for studying the mechanisms underlying OCD.
  • Lever-pressing tasks can simulate compulsive behavior in rodents.
  • Signal attenuation can help differentiate between compulsive and repetitive behaviors.

Purpose of Study

  • To develop a reliable method for inducing compulsive-like behavior in rats.
  • To evaluate the effects of pharmacological interventions on compulsive behavior.
  • To provide a quantitative measure of compulsive-like responses.

Methods Used

  • Training rats to lever press for food rewards.
  • Introducing a compound stimulus (light and tone) during training.
  • Attenuating the signaling properties of the compound stimulus.
  • Measuring lever press responses following signal attenuation.

Main Results

  • Signal attenuation led to increased lever presses without food reward attempts.
  • The method is validated and selective for anti-compulsive drugs.
  • Quantitative measures were obtained, minimizing inter-experimenter variability.
  • The technique can differentiate between compulsive-like and non-compulsive behaviors.

Conclusions

  • This protocol provides a robust framework for studying OCD in animal models.
  • It can be utilized to assess the efficacy of novel therapeutic agents.
  • The findings have implications for understanding the neurobiological basis of OCD.

Frequently Asked Questions

What is the main goal of this study?
The main goal is to induce compulsive-like behavior in rats to study OCD.
How does the signal attenuation method work?
It involves repeated exposure to a stimulus without food rewards, increasing compulsive-like lever pressing.
What are the advantages of this technique?
It is highly validated, selective for anti-compulsive drugs, and provides quantitative measures.
Can this method differentiate between compulsive and repetitive behaviors?
Yes, it can distinguish between compulsive-like behaviors and non-compulsive repetitive actions.
What implications does this research have for OCD therapy?
It can help detect the effects of novel pharmacological and non-pharmacological treatments for OCD.

在本文中描述的协议的目的是诱导大鼠强迫样行为的强迫症(OCD)的研究。此行为是由一个衰减指示的杠杆压响应,有效地生产食品的信号沉淀。

该程序的总体目标是在大鼠中诱导强迫性行为,以研究强迫症。这是通过首先训练大鼠收集食物奖励来实现的,然后由光和音调组成的复合刺激来实现。第二步是训练大鼠杠杆按压以获得食物奖励,这伴随着复合刺激。

接下来,化合物刺激的信号传导特性通过反复暴露而减弱,而没有食物奖励和杠杆呈现。最后一步是测量信号衰减后的杠杆、按压响应。最终,信号衰减程序导致杠杆按下次数增加,而不是随后尝试收集食物奖励。

与现有方法(如大理石轴承队友、交替等)相比,该技术的主要优点是它经过高度验证,对抗强迫药物具有高度选择性,区分强迫性行为和重复但非强迫性的行为,并使用定量、无偏且不受实验者间差异影响的措施。该技术的意义延伸到强迫症的治疗,因为它可用于检测新型药物和非药物作的抗强迫作用和促强迫作用。第一步是在研究开始前五天每天处理大鼠约两分钟。

在处理的第一天,开始 22 小时的食物限制计划。让老鼠在家笼中吃东西两个小时,不早于 30 分钟。处理后,让老鼠随时自由饮水。

在处理的最后三天,将 20 到 30 个食物颗粒放在家笼内的一个小托盘上。确保每只老鼠至少吃两粒药丸。此协议需要相邻的房间。

一个用作使用前存放大鼠的等候室,另一个用作测试期间使用的歌剧室,至少在行为测试开始前 15 分钟将大鼠运送到等候室为了适应杂志训练的第一天,在食物杂志中放入足够量的食物颗粒,以便大鼠可以看到它们。一种方法是放置颗粒,使它们使铰链面板保持微微打开。将大鼠放入作室中,五分钟后验证是否已收集所有颗粒。

如果他们继续培训计划。如果没有,请额外等待 5 分钟开始训练。打开室内灯,将单个食物颗粒放入食物杂志中。

在 5 秒的变量之后,延迟由弹匣光和音调组成的复合刺激与食物颗粒同时传递。老鼠的头进入食物杂志后,化合物刺激和屋灯关闭。或者在 15 秒后,以先到者为准。

首先,设置作室,以便有加固杆并且室内灯亮起。在整个训练过程中,在将大鼠放入腔室之前,在杠杆上放一些颗粒,让大鼠探索直到它在收集食物颗粒时按下杠杆。这将触发单个食物颗粒的输送和化合物刺激的开始。

化合物刺激在大鼠头部进入食物杂志完成试验后关闭,或在 15 秒后关闭未完成的试验程序,在大鼠完成 30 次试验后停止运行。如果动物难以获得杠杆压迫,请在塑形过程中进行塑形。保持隔音外腔的门打开,观察作室中的大鼠。

当大鼠接近杠杆时,使用软件激活食物颗粒的输送和化合物刺激的开始。一开始。当老鼠在杠杆附近时加固它,但只有当它与杠杆进行实际物理接触时,才逐渐开始加固它。

最后,仅尝试按压它。对腔室进行编程,以便通过室内灯光的开始来表示每次试验的开始。五秒钟后,引入了两个杠杆。

将大鼠置于作室中,然后在训练的第一天激活训练计划。定义 15 秒后要关闭的复合刺激。为了便于获得杠杆,请按以下两天的响应。

将复合刺激定义为仅持续 10 秒。为确保弹匣进入装置紧贴拉杆,请按响应键。在每次试验之后进行第 32 次试验间隔计划。

老鼠按下加固杆并收集食物颗粒 40 次后,杠杆压制训练课程停止运行。训练后,将大鼠随机分配到不同的实验组,确保各组之间没有统计学上的显著差异。信号衰减的过程与弹匣训练相同,只是颗粒分配器是空的,并且食物颗粒不会随着化合物刺激的开始而被输送。

在训练结束时。确保大鼠在化合物刺激开始后将头插入食物杂志超过 14 次,从而试图收集食物颗粒。要开始常规的灭绝阶段,请将大鼠带到等候室一段时间,其时间相当于信号衰减阶段的平均持续时间。

以与杠杆压榨训练相同的方式运行测试程序,除了在这些条件下将颗粒分配器留空,按下加固的杠杆会导致化合物刺激的出现,但没有食物被输送。将大鼠放入腔室后,记录未进入弹匣的过度杠杆按压次数,以及另外记录非加固杠杆上的杠杆按压次数和鼻子戳的次数。该图显示了信号衰减后具有代表性的剂量反应。

在较高剂量的药物下,过量杠杆按压后进入弹匣的次数和未完成的杠杆按压次数均减少。该图比较了信号衰减和规律消光对盐水和药物暴露大鼠的影响。在这两种手术中,该药物都减少了过度杠杆按压和弹匣进入的次数。

此外,它还减少了信号衰减中未完成的杠杆按压的数量,但在常规消光程序中没有减少。在此程序之后,可以执行其他方法,如组织学和生化分析,以回答有关神经解剖学改变和各种神经递质系统参与杠杆按压的其他问题。看完这个视频后,你应该对如何通过在复合刺激存在下教红人杠杆按压来诱发强迫性行为有一个很好的了解,以及如何在以后减弱这种刺激。

最后,如何评估这种衰减对 leva 压力行为的影响。

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