基因敲除小鼠骨髓β肾上腺素能受体可调节室旁核神经炎症的 miRNA 转录组网络。

Genetic ablation of bone marrow beta-adrenergic receptors in mice modulates miRNA-transcriptome networks of neuroinflammation in the paraventricular nucleus.

机构信息

Department of Physiological Sciences, College of Veterinary Medicine, University of Florida, Gainesville, Florida.

Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research, IDAEA-CSIC, Jordi Girona, Barcelona, Spain.

出版信息

Physiol Genomics. 2020 Apr 1;52(4):169-177. doi: 10.1152/physiolgenomics.00001.2020. Epub 2020 Feb 24.

Abstract

Elucidating molecular pathways regulating neuroimmune communication is critical for therapeutic interventions in conditions characterized by overactive immune responses and dysfunctional autonomic nervous system. We generated a bone marrow-specific adrenergic beta 1 and beta 2 knockout mouse chimera (AdrB1.B2 KO) to determine how sympathetic drive to the bone affects transcripts and miRNAs in the hypothalamic paraventricular nucleus (PVN). This model has previously exhibited a dampened systemic immune response and decreased blood pressure compared with control animals. Reduced sympathetic responsiveness of the bone marrow hematopoietic cells of AdrB1.B2 KO chimera led to suppression of transcriptional networks that included leukocyte cell adhesion and migration and T cell-activation and recruitment. Transcriptome responses related to IL-17a signaling and the renin-angiotensin system were also suppressed in the PVN. Based on the transcriptome response, we next computationally predicted miRNAs in the PVN that may underscore the reduced sympathetic responsiveness of the bone marrow cells. These included miR-27b-3p, miR-150, miR-223-3p, and miR-326. Using real-time PCR, we measured a downregulation in the expression of miR-150-5p, miR-205-5p, miR-223-3p, miR-375-5p, miR-499a-5p, miR-27b-3p, let-7a-5p, and miR-21a-5p in the PVN of AdrB1.B2 KO chimera, confirming computational predictions that these miRNAs are associated with reduced neuro-immune responses and the loss of sympathetic responsiveness in the bone marrow. Intriguingly, directional responses of the miRNA corresponded to mRNAs, suggesting complex temporal or circuit-dependent posttranscriptional control of gene expression in the PVN. This study identifies molecular pathways involved in neural-immune interactions that may act as targets of therapeutic intervention for a dysfunctional autonomic nervous system.

摘要

阐明调节神经免疫通讯的分子途径对于治疗以过度免疫反应和自主神经系统功能障碍为特征的疾病至关重要。我们生成了骨髓特异性肾上腺素能β1 和β2 敲除小鼠嵌合体(AdrB1.B2 KO),以确定骨髓中的交感神经支配如何影响下丘脑室旁核(PVN)中的转录物和 microRNA。与对照动物相比,该模型先前表现出全身性免疫反应减弱和血压降低。AdrB1.B2 KO 嵌合体骨髓造血细胞的交感神经反应性降低导致包括白细胞细胞黏附和迁移以及 T 细胞激活和募集在内的转录网络受到抑制。PVN 中的白细胞介素 17a 信号和肾素-血管紧张素系统相关的转录组反应也受到抑制。基于转录组反应,我们接下来通过计算预测了可能强调骨髓细胞交感神经反应性降低的 PVN 中的 microRNA。这些包括 miR-27b-3p、miR-150、miR-223-3p 和 miR-326。通过实时 PCR,我们测量到 AdrB1.B2 KO 嵌合体 PVN 中 miR-150-5p、miR-205-5p、miR-223-3p、miR-375-5p、miR-499a-5p、miR-27b-3p、let-7a-5p 和 miR-21a-5p 的表达下调,证实了计算预测,这些 microRNA 与骨髓中神经免疫反应降低和交感神经反应性丧失有关。有趣的是,microRNA 的定向反应与 mRNAs 相对应,这表明 PVN 中基因表达的复杂时间或电路依赖性转录后控制。这项研究确定了参与神经免疫相互作用的分子途径,这些途径可能成为治疗自主神经系统功能障碍的靶点。

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