Sciatic Nerve Stimulation Mitigates Depression-Like Behaviors and Memory Deficits in Stressed Mice

Area of Science:

• Neuroscience
• Cellular Biology
• Pharmacology

Background:

• Stress significantly contributes to depression and cognitive decline.
• Current pharmacotherapies have limitations, necessitating alternative treatments.
• Astrocytic dysfunction and cellular senescence are implicated in stress-related neurological deficits.

Purpose of the Study:

• To investigate the therapeutic efficacy of sciatic nerve stimulation (SNS) in mitigating stress-induced depressive behaviors and memory deficits.
• To explore the role of astrocytic dysfunction and cellular senescence in the hippocampus.
• To evaluate SNS as a non-pharmacological intervention for stress-related conditions.

Main Methods:

• C57BL/6 mice were exposed to water immersion restraint stress (WIRS) to induce stress.
• Behavioral tests assessed locomotion, anxiety, depression, and memory.
• Hippocampal astrocytic markers (GFAP) and cellular senescence (SA-β-gal, p16, p21) were analyzed.
• Vitamin C was administered to assess the role of anti-senescence effects.

Main Results:

• SNS (20 Hz) significantly improved cognitive function and reduced depression-like behavior in WIRS mice.
• SNS restored hippocampal GFAP expression and reduced cellular senescence markers.
• Vitamin C reduced senescence and depressive behavior but did not reverse memory deficits or restore GFAP, indicating SNS benefits extend beyond anti-senescence.

Conclusions:

• SNS effectively counteracts chronic stress-induced neurobehavioral consequences by targeting astrocytic dysfunction and cellular senescence.
• SNS demonstrates potential as a promising non-pharmacological strategy for treating stress-related depression and cognitive decline.
• Further research is warranted for clinical translation and exploring SNS's broader therapeutic applications.