Complement activation in the injured central nervous system: another dual-edged sword?

Area of Science:

• Neuroscience
• Immunology
• Pathology

Background:

• The complement system, part of innate immunity, is increasingly recognized for its role in central nervous system (CNS) physiology and disease.
• Recent research highlights complement's involvement in neural development, synapse elimination, network maturation, neurodegenerative disorders, and neurotraumatic events.
• Neuronal homeostasis disruption during injury triggers rapid complement activation.

Purpose of the Study:

• To review recent findings on complement activation in acquired brain and spinal cord injuries.
• To summarize the role of complement in ischemic-reperfusion injury (stroke), traumatic brain injury (TBI), and spinal cord injury (SCI).
• To highlight the therapeutic potential of complement-targeted strategies for neurological conditions.

Main Methods:

• Literature review of recent studies on complement system activation.
• Analysis of complement's role in various neurological injury models.
• Synthesis of findings related to neuroinflammation and neuronal damage.

Main Results:

• Complement activation is a significant factor in the pathophysiology of stroke, TBI, and SCI.
• The complement system influences both acute injury and chronic neurodegeneration.
• Evidence suggests complement contributes to neuronal damage and functional deficits post-injury.

Conclusions:

• Complement activation is a critical mediator in acquired brain and spinal cord injuries.
• Targeting the complement system offers a promising therapeutic avenue for mitigating neurological damage.
• Further research into complement-targeted therapies could lead to improved outcomes for patients with CNS injuries.