Distinct Role of Parvalbumin Expressing Neurons in the Reticular Thalamic Nucleus in Nociception.

IF 1.8 4区 医学 Q3 MEDICINE, RESEARCH & EXPERIMENTAL Experimental Neurobiology Pub Date : 2023-12-31 DOI:10.5607/en23018
Sanggeon Park, Jeiwon Cho, Yeowool Huh
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Abstract

Loss of inhibition is suggested to cause pathological pain symptoms. Indeed, some human case reports suggest that lesions including the thalamic reticular nucleus (TRN) which provides major inhibitory inputs to other thalamic nuclei, may induce thalamic pain, a type of neuropathic pain. In support, recent studies demonstrated that activation of GABAergic neurons in the TRN reduces nociceptive responses in mice, reiterating the importance of the TRN in gating nociception. However, whether biochemically distinct neuronal types in the TRN differentially contribute to gating nociception has not been investigated. We, therefore, investigated whether the activity of parvalbumin (PV) and somatostatin (SOM) expressing neurons in the somatosensory TRN differentially modulate nociceptive behaviors using optogenetics and immunostaining techniques. We found that activation of PV neurons in the somatosensory TRN significantly reduced nociceptive behaviors, while activation of SOM neurons in the TRN had no such effect. Also, selective activation of PV neurons, but not SOM neurons, in the TRN activated relatively more PV neurons in the primary somatosensory cortex, which delivers inhibitory effect in the cortex, when measured with cFos and PV double staining. Results of our study suggest that PV neurons in the somatosensory TRN have a stronger influence in regulating nociception and that their activations may provide further inhibition in the somatosensory cortex by activating cortical PV neurons.

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丘脑网状核中表达 Parvalbumin 的神经元在痛觉中的独特作用
抑制作用的丧失被认为会导致病理性疼痛症状。事实上,一些人类病例报告表明,丘脑网状核(TRN)为其他丘脑核提供主要的抑制性输入,丘脑网状核的病变可能诱发丘脑痛(一种神经病理性疼痛)。最近的研究表明,激活丘脑网状核中的 GABA 能神经元可减轻小鼠的痛觉反应,从而重申了丘脑网状核在调控痛觉中的重要性。然而,TRN中不同类型的生化神经元是否对痛觉门控起着不同的作用尚未得到研究。因此,我们利用光遗传学和免疫染色技术研究了躯体感觉 TRN 中表达副视蛋白(PV)和体生长抑素(SOM)的神经元的活性是否会对痛觉行为产生不同的调节作用。我们发现,激活躯体感觉 TRN 中的 PV 神经元可显著减少痛觉行为,而激活 TRN 中的 SOM 神经元则没有这种效果。此外,用 cFos 和 PV 双染色法测量,选择性激活 TRN 中的 PV 神经元(而非 SOM 神经元)会激活初级躯体感觉皮层中相对较多的 PV 神经元,从而在皮层中产生抑制作用。我们的研究结果表明,躯体感觉 TRN 中的 PV 神经元在调节痛觉方面具有更强的影响力,它们的激活可能会通过激活皮层 PV 神经元进一步抑制躯体感觉皮层。
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来源期刊
Experimental Neurobiology
Experimental Neurobiology Neuroscience-Cellular and Molecular Neuroscience
CiteScore
4.30
自引率
4.20%
发文量
29
期刊介绍: Experimental Neurobiology is an international forum for interdisciplinary investigations of the nervous system. The journal aims to publish papers that present novel observations in all fields of neuroscience, encompassing cellular & molecular neuroscience, development/differentiation/plasticity, neurobiology of disease, systems/cognitive/behavioral neuroscience, drug development & industrial application, brain-machine interface, methodologies/tools, and clinical neuroscience. It should be of interest to a broad scientific audience working on the biochemical, molecular biological, cell biological, pharmacological, physiological, psychophysical, clinical, anatomical, cognitive, and biotechnological aspects of neuroscience. The journal publishes both original research articles and review articles. Experimental Neurobiology is an open access, peer-reviewed online journal. The journal is published jointly by The Korean Society for Brain and Neural Sciences & The Korean Society for Neurodegenerative Disease.
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