Ryugaku Jinja · Professor Archive
Public Professor Archive
Haruki Iwai岩井 治樹
Kagoshima University · Graduate School of Medical and Dental Sciences · 助教
- Publications
- 4
- Projects
- 4
- Keywords
- 8
留学
神社Kagoshima University · Graduate School of Medical and Dental Sciences · 助教
Research keywords痛覚・三叉神経・内臓感覚・味覚・神経回路・神経科学・神経系・線条体
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- Goto T., Kuramoto E., Iwai H., Yamanaka A. . Cytoarchitecture and intercellular interactions in the trigeminal ganglion: Associations with neuropathic pain in the orofacial region . Jo2024 · 記述言語： 英語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： Journal of Oral Biosciences Background: Disorders of the trigeminal nerve, a sensory nerve of the orofacial region, often lead to complications in dental practice, including neuropathic pain, allodynia, and ectopic pain. Management of these complications requires an understanding of the cytoarchitecture of the trigeminal ganglion, where the cell bodies of the trigeminal nerve are located, and the mechanisms of cell-cell interactions. Highlights: In the trigeminal ganglion, ganglion, satellite, Schwann, and immune cells coexist and interact. Cell-cell interactions are complex and occur through direct contact via gap junctions or through mediators such as adenosine triphosphate, nitric oxide, peptides, and cytokines. Interactions between the nervous and immune systems within the trigeminal ganglion may have neuroprotective effects during nerve injury or may exacerbate inflammation and produce chronic pain. Under pathological conditions of the trigeminal nerve, cell-cell interactions can cause allodynia and ectopic pain. Although cell-cell interactions that occur via mediators can act at some distance, they are more effective when the cells are close together. Therefore, information on the three-dimensional topography of trigeminal ganglion cells is essential for understanding the pathophysiology of ectopic pain. Conclusions: A three-dimensional map of the somatotopic localization of trigeminal ganglion neurons revealed that ganglion cells innervating distant orofacial regions are often apposed to each other, interacting with and potentially contributing to ectopic pain. Elucidation of the complex network of mediators and their receptors responsible for intercellular communication within the trigeminal ganglion is essential for understanding ectopic pain. DOI： 10.1016/j.job.2024.07.003 Scopus PubMed researchmap
- Iizasa E., Iwai H., Oyamada Y., Hamashima K., Nishi R., Ataka K., Amitani H., Ohinata K., Kato I., Asakawa A. . A plant-derived δ opioid receptor agonist rubiscolin-6 ameliorates sickness beha2024 · 記述言語： 日本語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： Journal of Functional Foods Cancer cachexia, which encompasses a range of sickness behaviors such as anorexia, reduced locomotor activity, and depression, diminishes quality of life and increases mortality in cancer patients. Rubiscolin-6 is a hexapeptide derived from ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco), a major plant leaf protein. Previous reports have demonstrated that rubiscolin-6 functions as an agonist of the δ opioid receptor, inducing diverse effects such as orexigenic, antinociceptive, and antidepressant-like effects. In this study, we investigated the effects of rubiscolin-6 on sickness behavior in colon26-bearing cachexia model mice. Intraperitoneal administration of rubiscolin-6 enhanced food intake in cachexic mice with chronic anorexia. It also increased locomotor activity, which decreased in cachexic mice, as assessed by the open field test. Moreover, the tail suspension test revealed that rubiscolin-6 alleviated depression-like behavior in mice with cachexia. These findings imply that rubiscolin-6 could be used to ameliorate the sickness behavior associated with cancer cachexia. DOI： 10.1016/j.jff.2024.106297 Scopus researchmap
- Kusumoto J., Ataka K., Iwai H., Oga Y., Yamagata K., Marutani K., Ishikawa T., Asakawa A., Miyawaki S. . Malocclusion impairs cognitive behavior via AgRP signaling in adolescent mice .2023 · 担当区分： 筆頭著者 記述言語： 英語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： Frontiers in Neuroscience Introduction: Occlusal disharmony induced by deteriorating oral health conditions, such as tooth loss and decreased masticatory muscle due to sarcopenia, is one of the causes of cognitive impairment. Chewing is an essential oral function for maintaining cognitive function not only in the elderly but also in young people. Malocclusion is an occlusal disharmony that commonly occurs in children. The connection between a decline in cognitive function and malocclusion in children has been shown with chronic mouth breathing, obstructive sleep apnea syndrome, and thumb/digit sucking habits. However, the mechanism of malocclusion-induced cognitive decline is not fully understood. We recently reported an association between feeding-related neuropeptides and cognitive decline in adolescent mice with activity-based anorexia. The aim of the present study was to assess the effects of malocclusion on cognitive behavior and clarify the connection between cognitive decline and hypothalamic feeding-related neuropeptides in adolescent mice with malocclusion. Methods: Four-week-old mice were randomly assigned to the sham-operated solid diet-fed (Sham/solid), sham-operated powder diet-fed (Sham/powder), or malocclusion-operated powder diet-fed (Malocclusion/powder) group. We applied composite resin to the mandibular anterior teeth to simulate malocclusion. We evaluated cognitive behavior using a novel object recognition (NOR) test, measured hypothalamic feeding-related neuropeptide mRNA expression levels, and enumerated c-Fos-positive cells in the hypothalamus 1 month after surgery. We also evaluated the effects of central antibody administration on cognitive behavior impairment in the NOR test. Results: The NOR indices were lower and the agouti-related peptide (AgRP) mRNA levels and number of c-Fos-positive cells were higher in the malocclusion/powder group than in the other groups. The c-Fos-positive cells were also AgRP-positive. We observed that the central administration of anti-AgRP antibody significantly increased the NOR indices. Discussion: The present study suggests that elevated cerebral AgRP signaling contributes to malocclusion-induced cognitive decline in adolescents, and the suppression of AgRP signaling can be a new therapeutic target against cognitive decline in occlusal disharmony. DOI： 10.3389/fnins.2023.1156523 Scopus PubMed researchmap
- Pro Tips & Techniques for Drawing Animals2023 · Tuttle Pub 2023年8月 （ ISBN: 0804856117 ）
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