Interleukin-3 Modulates Macrophage Phagocytic Activity and Promotes Spinal Cord Injury Repair

IF 4.8 1区医学 Q1 NEUROSCIENCES

CNS Neuroscience & Therapeutics Pub Date : 2024-12-19 DOI:10.1111/cns.70181

Jianjian Li, Meige Zheng, Fangru Ouyang, Jianan Ye, Jinxin Huang, Yuanzhe Zhao, Jingwen Wang, Fangli Shan, Ziyu Li, Shuishen Yu, Fei Yao, Dasheng Tian, Li Cheng, Juehua Jing

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Abstract

Background

Effective clearance of lipid-rich debris by macrophages is critical for neural repair and regeneration after spinal cord injury (SCI). Interleukin-3 (IL-3) has been implicated in programming microglia to cluster and clear pathological aggregates in neurodegenerative disease. Yet, the influence of IL-3 on lipid debris clearance post-SCI is not well characterized.

Methods

We established a mouse model of spinal cord compression injury to investigate the role of IL-3. Blockage of IL-3 was achieved through intrathecal delivery of an IL-3-neutralizing antibody, while IL-3 activation was augmented via in situ injection of recombinant IL-3 into the lesion site immediately post-SCI. Immunofluorescence staining was performed to determine IL-3 and IL-3Rα sources and distribution, lipid droplet accumulation, neuron preservation, and axon regeneration after SCI. The Basso Mouse Scale (BMS) and footprint analysis were employed to evaluate locomotor function recovery.

Results

We found that IL-3 expression was significantly upregulated post-SCI, peaking at 14 days post-injury (dpi) and persisting until 28 dpi. Notably, IL-3 was primarily secreted by astrocytes surrounding the lesion epicenter. Correspondingly, IL-3Rα was predominantly observed in macrophages within the injury core, also elevating at 14 dpi. Neutralization of IL-3 led to increased lipid droplet accumulation, along with markedly widespread of macrophages and decreased neuronal survival, resulting in severe motor deficits compared to controls. Conversely, in situ injection of IL-3 reduced lipid droplet accumulation in macrophages, preserved neurons, promoted axon regeneration, and ultimately contributed to the recovery of motor function after SCI.

Conclusion

Our findings shed light on the role of IL-3 in modulating macrophage phagocytic activity and suggest that the IL-3/IL-3Rα pathway may be a potential therapeutic target for enhancing neural repair and functional recovery after SCI.

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来源期刊

CNS Neuroscience & Therapeutics 医学-神经科学

CiteScore

7.30

自引率

12.70%

发文量

240

审稿时长

2 months

期刊介绍： CNS Neuroscience & Therapeutics provides a medium for rapid publication of original clinical, experimental, and translational research papers, timely reviews and reports of novel findings of therapeutic relevance to the central nervous system, as well as papers related to clinical pharmacology, drug development and novel methodologies for drug evaluation. The journal focuses on neurological and psychiatric diseases such as stroke, Parkinson’s disease, Alzheimer’s disease, depression, schizophrenia, epilepsy, and drug abuse.