Atorvastatin evokes a serotonergic system-dependent antidepressant-like effect in mice

Area of Science:

• Neuroscience
• Pharmacology
• Biochemistry

Background:

• Atorvastatin, a statin for hypercholesterolemia, shows neuroprotective properties.
• Previous studies demonstrated atorvastatin's acute antidepressant-like effect in mice.

Purpose of the Study:

• To investigate the serotonergic system's role in atorvastatin's antidepressant-like effect.
• To elucidate the specific serotonin receptors and pathways involved.

Main Methods:

• Used p-chlorophenylalanine methyl ester (PCPA) to deplete serotonin.
• Administered atorvastatin, fluoxetine, and receptor antagonists (WAY100635, ketanserin).
• Examined effects on antidepressant-like behavior and serotonin levels in the hippocampus and frontal cortex.

Main Results:

• Serotonin depletion by PCPA abolished atorvastatin's antidepressant-like effect.
• Atorvastatin and fluoxetine showed antidepressant-like effects without altering serotonin levels.
• 5-HT1A and 5-HT2A/2C receptor antagonists blocked atorvastatin's effect.
• Combined sub-effective doses of atorvastatin with SSRIs enhanced antidepressant-like effects.

Conclusions:

• Atorvastatin's antidepressant-like effect is mediated by the serotonergic system.
• The mechanism involves modulation of serotonin receptors, not direct serotonin level changes.
• Atorvastatin holds potential as an antidepressant agent, possibly in combination therapies.