Electroconvulsive stimulation attenuates chronic neuroinflammation.

Area of Science:

• Neuroscience
• Immunology
• Cell Biology

Background:

• Electroconvulsive therapy (ECT) is effective for treatment-resistant depression, but its mechanisms remain unclear.
• Microglial toxicity is implicated in depression and neuroinflammatory diseases, highlighting a need for new therapies.
• Chronic neuroinflammation and microglial neurotoxicity are key factors in various neurological conditions.

Purpose of the Study:

• To investigate the effects of electroconvulsive seizures (ECS) on chronic neuroinflammation and microglial neurotoxicity.
• To determine if ECS directly impacts the central nervous system's innate immune response.

Main Methods:

• ECS was applied to a mouse model of chronic experimental autoimmune encephalomyelitis (EAE).
• Systemic immune responses in donor mice and CNS innate immune activity in recipient mice were analyzed.
• In vivo and ex vivo assays assessed microglial function, including nitric oxide and reactive oxygen species (ROS) production.

Main Results:

• ECS reduced spinal immune cell infiltration, myelin and axonal loss, and clinical symptoms in EAE mice.
• ECS did not alter the encephalitogenicity of systemic T cells but directly inhibited T cell-induced neuroinflammation in the CNS.
• ECS suppressed microglial neurotoxicity by decreasing inducible NOS expression, nitric oxide, ROS production, and CNS oxidative stress.
• Microglia from ECS-treated mice showed reduced T cell stimulatory and chemoattractant factor expression.

Conclusions:

• Electroconvulsive therapy directly targets the CNS innate immune system to mitigate neuroinflammation.
• ECS attenuates microglial neurotoxicity, suggesting a novel therapeutic strategy for neuroinflammatory, neuropsychiatric, and neurodegenerative diseases.