Dominant mechanism in spinal cord injury-induced immunodeficiency syndrome (SCI-IDS): sympathetic hyperreflexia

Ping Yang; Zhi-qun Bian; Zhen-bo Song; Cheng-ying Yang; Li Wang; Zhong-xiang Yao

doi:10.1515/revneuro-2023-0090

Artikel

Dominant mechanism in spinal cord injury-induced immunodeficiency syndrome (SCI-IDS): sympathetic hyperreflexia

Ping Yang , Zhi-qun Bian , Zhen-bo Song , Cheng-ying Yang , Li Wang und Zhong-xiang Yao

Veröffentlicht/Copyright: 30. Oktober 2023

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Abstract

Clinical studies have shown that individuals with spinal cord injury (SCI) are particularly susceptible to infectious diseases, resulting in a syndrome called SCI-induced immunodeficiency syndrome (SCI-IDS), which is the leading cause of death after SCI. It is believed that SCI-IDS is associated with exaggerated activation of sympathetic preganglionic neurons (SPNs). After SCI, disruption of bulbospinal projections from the medulla oblongata C1 neurons to the SPNs results in the loss of sympathetic inhibitory modulation from the brain and brainstem and the occurrence of abnormally high levels of spinal sympathetic reflexes (SSR), named sympathetic hyperreflexia. As the post-injury survival time lengthens, mass recruitment and anomalous sprouting of excitatory interneurons within the spinal cord result in increased SSR excitability, resulting in an excess sympathetic output that disrupts the immune response. Therefore, we first analyze the structural underpinnings of the spinal cord-sympathetic nervous system-immune system after SCI, then demonstrate the progress in highlighting mechanisms of SCI-IDS focusing on norepinephrine (NE)/Beta 2-adrenergic receptor (β2-AR) signal pathways, and summarize recent preclinical studies examining potential means such as regulating SSR and inhibiting β2-AR signal pathways to improve immune function after SCI. Finally, we present research perspectives such as to promote the effective regeneration of C1 neurons to rebuild the connection of C1 neurons with SPNs, to regulate excitable or inhibitory interneurons, and specifically to target β2-AR signal pathways to re-establish neuroimmune balance. These will help us design effective strategies to reverse post-SCI sympathetic hyperreflexia and improve the overall quality of life for individuals with SCI.

Keywords: spinal cord injury (SCI); SCI-induced immunodeficiency syndrome (SCI-IDS); sympathetic hyperreflexia; plasticity; norepinephrine (NE); beta 2-adrenergic receptor (β2-AR)

Corresponding authors: Ping Yang, Department of Neurobiology, Army Medical University (Third Military Medical University), Chongqing 400038, China, E-mail: 649488699@qq.com; and Zhong-xiang Yao, Department of Physiology, Army Medical University (Third Military Medical University), Chongqing 400038, China, E-mail: yaozhx@yahoo.com

Funding source: National Natural Science Foundation of China

Award Identifier / Grant number: 82271423, 82071761

Research ethics: Not applicable.
Author contributions: PY collected the literature, analyzed the data, and wrote the manuscript. ZBS was involved in the schematic drawing. LW, CYY, and ZQB participated in part in the collection and discussion of the document. PY and ZXY conceived, designed, supervised, initialed, reviewed, edited and revised the manuscript. The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
Competing interests: The authors state no conflict of interest.
Research funding: This work was supported by grants from the National Natural Science Foundation of China (No. 82271423 to PY and No. 82071761 to CYY).
Data availability: Not applicable.

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Received: 2023-08-16

Accepted: 2023-10-13

Published Online: 2023-10-30

Published in Print: 2024-04-25

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Schlagwörter für diesen Artikel

spinal cord injury (SCI); SCI-induced immunodeficiency syndrome (SCI-IDS); sympathetic hyperreflexia; plasticity; norepinephrine (NE); beta 2-adrenergic receptor (β2-AR)