Histamine H3 Receptor Antagonists Influence the Directional Growth of Type II Spiral Ganglion Neurites Within the Developing Cochlea of C57BL/6 Mice

IF 3.8 3区 医学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY
Lingyi Kong, Heidi Olze, Agnieszka J. Szczepek
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Abstract

The histamine H3 receptor (H3R) is a crucial regulator of synaptic plasticity, neurotransmitter release, and neural signaling within the central nervous system. However, its role in the cochlea remains poorly understood, even though mast cells, a rich endogenous source of histamine, have recently been documented in the mammalian cochlea. This study examined H3R expression and localization in the postnatal day 4–5 (P4-5) C57BL/6 mouse cochlea and evaluated its functional consequences under antagonist treatment. RT-qPCR analysis showed significantly higher H3R mRNA levels in the modiolus compared to the organ of Corti and the lateral wall. Immunofluorescence staining confirmed H3R localization in hair cells (HCs) and spiral ganglion neurons (SGNs). Dissected cochlear explants exposed to two distinct H3R antagonists—ciproxifan and pitolisant—at concentrations of 10µM, 50µM, and 100µM, displayed different responses: ciproxifan induced dose-dependent HC loss. In contrast, pitolisant caused no loss of HC but led to stereociliary abnormalities at higher concentrations. Both antagonists disrupted type II SGN neurite projections, redirecting their normal basal-directed trajectory toward the apical region. These findings implicate H3R in maintaining cochlear structural integrity and guiding SGN neurite development during early postnatal maturation. Further investigation into H3R-mediated mechanisms may reveal new therapeutic targets for hearing preservation and repair.

组胺H3受体拮抗剂影响C57BL/6小鼠耳蜗内II型螺旋神经节神经突的定向生长
组胺H3受体(H3R)是中枢神经系统中突触可塑性、神经递质释放和神经信号传导的重要调节因子。然而,尽管肥大细胞(一种丰富的内源性组胺来源)最近在哺乳动物耳蜗中被证实存在,但对其在耳蜗中的作用仍知之甚少。本研究检测了H3R在出生后4-5天(P4-5) C57BL/6小鼠耳蜗中的表达和定位,并评估了拮抗剂治疗对其功能的影响。RT-qPCR分析显示,与Corti器官和侧壁相比,modiolus中的H3R mRNA水平显著升高。免疫荧光染色证实H3R定位于毛细胞(HCs)和螺旋神经节神经元(sgn)。解剖的耳蜗外植体暴露于两种不同的H3R拮抗剂——环丙昔芬和吡托里森——浓度分别为10µM、50µM和100µM时,表现出不同的反应:环丙昔芬诱导剂量依赖性HC损失。相比之下,pitolisant没有引起HC的损失,但在高浓度时导致立体纤毛异常。两种拮抗剂都破坏了II型SGN神经突的投射,将其正常的基底指向的轨迹重新定向到根尖区域。这些发现暗示H3R在维持耳蜗结构完整性和指导出生后早期成熟的SGN神经突发育。进一步研究h3r介导的机制可能会发现新的听力保护和修复的治疗靶点。
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来源期刊
Neurochemical Research
Neurochemical Research 医学-神经科学
CiteScore
7.70
自引率
2.30%
发文量
320
审稿时长
6 months
期刊介绍: Neurochemical Research is devoted to the rapid publication of studies that use neurochemical methodology in research on nervous system structure and function. The journal publishes original reports of experimental and clinical research results, perceptive reviews of significant problem areas in the neurosciences, brief comments of a methodological or interpretive nature, and research summaries conducted by leading scientists whose works are not readily available in English.
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