The administration of a phentolamine infusion into the basolateral amygdala enhances long-term memory and diminishes anxiety-like behavior in stressed rats.

IF 1.6 4区 心理学 Q3 BEHAVIORAL SCIENCES Behavioural Pharmacology Pub Date : 2024-12-01 Epub Date: 2024-10-22 DOI:10.1097/FBP.0000000000000796
Ali Dehghani, Gholam Hossein Meftahi, Hedayat Sahraei
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Abstract

The basolateral amygdala (BLA) contains adrenergic receptors, which are known to be involved in stress, anxiety, and memory. The objective of this study was to explore whether inhibition of α-adrenergic receptors (by phentolamine, an α-adrenergic receptor antagonist) in the BLA can reduce foot-shock stress-induced anxiety-like behavior, memory deficits, and long-term potentiation (LTP) deficits within the CA1 region of the rat hippocampus. Forty male Wistar rats were assigned to the intact, control, stress (Str), Phent (phentolamine), and Phent + Str groups. Animals were subjected to six shocks on 4 consecutive days, and phentolamine was injected into BLA 20 min before the animals were placed in the foot-shock stress apparatus. Results from the elevated plus maze test (EPM) revealed a reduction in anxiety-like behaviors (by an increased number of entries into the open arm, percentage of time spent in the open arm, and rearing and freezing) among stressed animals upon receiving injections of phentolamine into the BLA. The open-field test results (increased rearing, grooming, and freezing behaviors) were consistent with the EPM test results. Phentolamine infusion into the BLA enhanced spatial memory, reducing errors in finding the target hole and decreasing latency time in the Barnes maze test for stress and nonstress conditions. Injecting phentolamine into the BLA on both sides effectively prevented LTP impairment in hippocampal CA1 neurons after being subjected to foot-shock stress. It has been suggested that phentolamine in the BLA can effectively improve anxiety-like behaviors and memory deficits induced by foot-shock stress.

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向杏仁基底外侧注射酚妥拉明可增强受压大鼠的长期记忆并减少焦虑行为。
杏仁基底外侧(BLA)含有肾上腺素能受体,众所周知,肾上腺素能受体与压力、焦虑和记忆有关。本研究的目的是探讨抑制α肾上腺素能受体(酚妥拉明,一种α肾上腺素能受体拮抗剂)是否能减少足震应激诱导的大鼠海马CA1区焦虑样行为、记忆缺陷和长期潜能(LTP)缺陷。40 只雄性 Wistar 大鼠分别被分到完整组、对照组、应激(Str)组、Phent(酚妥拉明)组和 Phent + Str 组。连续4天对大鼠进行6次电击,并在将大鼠放入脚部电击应激装置前20分钟将酚妥拉明注射到BLA中。高架加迷宫试验(EPM)的结果表明,在向BLA注射酚妥拉明后,应激动物的焦虑样行为(进入开放臂的次数增加、在开放臂中停留的时间百分比增加、仰卧和冻结)有所减少。开放场地测试结果(饲养、梳理和冻结行为增加)与EPM测试结果一致。向BLA注射酚妥拉明可增强空间记忆,减少寻找目标洞的错误,并缩短应激和非应激条件下巴恩斯迷宫测试的延迟时间。在BLA两侧注射酚妥拉明能有效防止海马CA1神经元在受到足震应激后的LTP损伤。有研究认为,在BLA注射酚妥拉明能有效改善足震应激引起的焦虑样行为和记忆缺陷。
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来源期刊
Behavioural Pharmacology
Behavioural Pharmacology 医学-行为科学
CiteScore
3.40
自引率
0.00%
发文量
84
审稿时长
6-12 weeks
期刊介绍: Behavioural Pharmacology accepts original full and short research reports in diverse areas ranging from ethopharmacology to the pharmacology of schedule-controlled operant behaviour, provided that their primary focus is behavioural. Suitable topics include drug, chemical and hormonal effects on behaviour, the neurochemical mechanisms under-lying behaviour, and behavioural methods for the study of drug action. Both animal and human studies are welcome; however, studies reporting neurochemical data should have a predominantly behavioural focus, and human studies should not consist exclusively of clinical trials or case reports. Preference is given to studies that demonstrate and develop the potential of behavioural methods, and to papers reporting findings of direct relevance to clinical problems. Papers making a significant theoretical contribution are particularly welcome and, where possible and merited, space is made available for authors to explore fully the theoretical implications of their findings. Reviews of an area of the literature or at an appropriate stage in the development of an author’s own work are welcome. Commentaries in areas of current interest are also considered for publication, as are Reviews and Commentaries in areas outside behavioural pharmacology, but of importance and interest to behavioural pharmacologists. Behavioural Pharmacology publishes frequent Special Issues on current hot topics. The editors welcome correspondence about whether a paper in preparation might be suitable for inclusion in a Special Issue.
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