背侧海马明显调节男性 IBS 样大鼠的内脏敏感性和焦虑行为。
Dorsoventral hippocampus distinctly modulates visceral sensitivity and anxiety behaviors in male IBS-like rats.
机构信息
Department of Pediatrics, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China.
Pain Research Institute, Fujian Provincial Key Laboratory of Brain Aging and Neurodegenerative Diseases, School of basic Medical Sciences, Fujian Medical University, Fuzhou, China.
出版信息
J Neurosci Res. 2024 Jan;102(1). doi: 10.1002/jnr.25289.
Accumulating evidences suggest dysfunctions in the hippocampus are associated with chronic pain. Nevertheless, the role of hippocampal circuitry in pain memories and emotional responses is not yet fully understood. In this study, we utilized a comprehensive approach that combined electromyography (EMG), photochemical genetic techniques, and anxiety-related behavioral paradigms to investigate the involvement of dorsal hippocampus (DH) and ventral hippocampus (VH) in visceral sensitivity and anxiety behaviors in male rats. Our results demonstrated that IBS-like rats exhibited comorbid visceral hypersensitivity and anxiety, along with the number of activated neurons in the VH was higher than that in the DH. Manipulation of glutamatergic neurons in the hippocampus was identified as a crucial mechanism underlying the mediation of both visceral sensitivity and anxiety behaviors. Specifically, optogenetic activation of the DH induced both visceral hypersensitivity and anxiety, while activation of the VH induced anxiety but did not affect visceral sensitivity. Conversely, chemogenetic inhibition of the DH reduced both visceral hypersensitivity and anxiety, whereas inhibition of the VH alleviated anxiety but did not alleviate visceral hypersensitivity in IBS-like rats. Our study highlights the important role of early life stress in inducing visceral hypersensitivity and anxiety, and further elucidates the distinct functional contributions of the DH and VH to these behavioral changes. These findings provide a theoretical basis for the diagnosis and treatment of IBS, and suggest that targeting specific hippocampal neuron subtypes may represent a promising therapeutic approach.
越来越多的证据表明,海马功能障碍与慢性疼痛有关。然而,海马回路在疼痛记忆和情绪反应中的作用尚不完全清楚。在这项研究中,我们采用了一种综合方法,结合肌电图(EMG)、光化学遗传技术和与焦虑相关的行为范式,研究了背侧海马(DH)和腹侧海马(VH)在雄性大鼠内脏敏感性和焦虑行为中的作用。我们的结果表明,IBS 样大鼠表现出共患内脏敏感性和焦虑,同时 VH 中激活的神经元数量高于 DH。海马中的谷氨酸能神经元的操纵被确定为介导内脏敏感性和焦虑行为的关键机制。具体来说,DH 的光遗传学激活既诱导内脏敏感性又诱导焦虑,而 VH 的激活仅诱导焦虑而不影响内脏敏感性。相反,DH 的化学遗传抑制既减轻了内脏敏感性又减轻了焦虑,而 VH 的抑制减轻了 IBS 样大鼠的焦虑但并未减轻内脏敏感性。我们的研究强调了早期生活应激在诱导内脏敏感性和焦虑中的重要作用,并进一步阐明了 DH 和 VH 对这些行为变化的不同功能贡献。这些发现为 IBS 的诊断和治疗提供了理论基础,并表明针对特定的海马神经元亚型可能是一种有前途的治疗方法。