Contribution of the intra-hippocampal orexin system in the regulation of restraint stress response to pain-related behaviors in the formalin test.

IF 1.6 4区 心理学 Q3 BEHAVIORAL SCIENCES
Behavioural Pharmacology Pub Date : 2024-04-01 Epub Date: 2023-11-07 DOI:10.1097/FBP.0000000000000755
Mehdi Sadeghi, Fatemeh Zareie, Masoumeh Gholami, Farzaneh Nazari-Serenjeh, Mohadeseh Ghalandari-Shamami, Abbas Haghparast
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Abstract

Stress-induced antinociception (SIA) is due to the activation of several neural pathways and neurotransmitters that often suppress pain perception. Studies have shown that the orexin neuropeptide system is essential in pain modulation. Therefore, this study aimed to investigate the role of orexinergic receptors in the hippocampal CA1 region in modulating SIA response during the formalin test as an animal model of inflammatory pain. The orexin-1 receptor (OX1r) antagonist, SB334867, at 1, 3, 10, and 30 nmol or TCS OX2 29 as an orexin-2 receptor (OX2r) antagonist at the same doses were microinjected into the CA1 region in rats. Five minutes later, rats were exposed to restraint stress (RS) for 3 h, and pain-related behaviors were monitored in 5-min blocks for the 60-min test period in the formalin test. Results showed that applying RS for 3 h reduced pain responses in the early and late phases of the formalin test. The main findings showed that intra-CA1 injection of orexin receptor antagonists reduced the antinociception caused by stress in both phases of the formalin test. In addition, the contribution of OX2r in mediating the antinociceptive effect of stress was more prominent than that of OX1r in the early phase of the formalin test. However, in the late phase, both receptors worked similarly. Accordingly, the orexin system and its two receptors in the CA1 region of the hippocampus regulate SIA response to this animal model of pain in formalin test.

福尔马林试验中海马内食欲素系统在约束应激反应对疼痛相关行为的调节中的作用。
压力诱导的镇痛(SIA)是由于几种神经通路和神经递质的激活,这些神经通路和递质通常会抑制疼痛感知。研究表明食欲素神经肽系统对疼痛调节至关重要。因此,本研究旨在研究在福尔马林试验作为炎症性疼痛动物模型期间,海马CA1区的食欲能受体在调节SIA反应中的作用。将1、3、10和30nmol的食欲素-1受体(OX1r)拮抗剂SB334867或相同剂量的TCS OX2 29作为食欲素-2受体(OX2r)拮抗物微量注射到大鼠的CA1区。5分钟后,大鼠暴露于约束应激(RS)3 h、 并且在福尔马林试验的60分钟试验期间以5分钟的块监测疼痛相关行为。结果表明,应用RS h降低了福尔马林试验早期和晚期的疼痛反应。主要发现表明,在福尔马林试验的两个阶段,在CA1内注射食欲素受体拮抗剂降低了由应激引起的抗伤害感受。此外,在福尔马林试验的早期阶段,OX2r在介导应激的抗伤害感受作用中的作用比OX1r更突出。然而,在晚期,两种受体的作用相似。因此,食欲素系统及其在海马CA1区的两种受体调节SIA对福尔马林试验中这种疼痛动物模型的反应。
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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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