Korean red ginseng alleviate depressive disorder by improving astrocyte gap junction function.

Area of Science:

• Neuroscience
• Pharmacology
• Traditional Medicine

Background:

• Korean red ginseng (KRG) exhibits antidepressant effects.
• The precise mechanism underlying KRG's antidepressant action remains unclear.
• Dysfunction in gap junction intercellular communication (GJIC) is implicated in the pathogenesis of depression.

Purpose of the Study:

• To investigate the antidepressant effects of KRG.
• To determine if KRG's antidepressant effects are mediated by modulating GJIC.

Main Methods:

• Depression models were established in rats using chronic restraint stress.
• Rats were treated with KRG, fluoxetine, or saline.
• Behavioral tests (forced swimming, sucrose preference, open field) assessed depressive symptoms.
• GJIC function was evaluated by Lucifer yellow diffusion and connexin 43 (Cx43) levels in the prefrontal cortex.
• The role of GJIC was further examined using carbenoxolone (CBX), a GJIC blocker.

Main Results:

• KRG administration significantly alleviated depression-like behaviors in rats.
• KRG treatment improved GJIC function, evidenced by increased Lucifer yellow diffusion and Cx43 levels.
• Carbenoxolone (CBX) administration induced depression-like symptoms and GJIC dysfunction, which were reversed by KRG.
• KRG also increased astrocyte numbers, suggesting a potential dual mechanism.

Conclusions:

• Korean red ginseng (KRG) demonstrates antidepressant properties.
• KRG alleviates depressive disorder by enhancing astrocytic gap junction communication.
• The findings suggest GJIC modulation as a key mechanism for KRG's therapeutic effect in depression.