Depression-like deficits in rats improved by subchronic modafinil.

Area of Science:

• Neuroscience
• Psychopharmacology
• Animal Models of Disease

Background:

• Depression is characterized by attentional and sensorimotor gating deficits, persisting despite antidepressant treatment.
• Modafinil has shown promise in clinical depression, but its effects in animal models are unknown.
• Restraint stress protocols can induce depression-like behaviors and cognitive impairments in rodents.

Purpose of the Study:

• To investigate the effects of modafinil on attention and sensorimotor gating in a rat model of depression.
• To assess modafinil's efficacy after subchronic treatment during a restraint stress protocol.

Main Methods:

• Rats underwent a 15-day restraint stress protocol to induce depression-like changes.
• Modafinil or placebo was administered subchronically starting on day 10.
• Behavioral tests included the forced swim test (FST), social novelty discrimination (SND), and prepulse inhibition (PPI).

Main Results:

• Restraint stress reduced body weight, decreased immobility in the FST, and impaired SND and PPI.
• Subchronic modafinil treatment reversed the restraint-induced deficits in the FST, SND, and PPI.
• Modafinil did not significantly affect body weight in the stressed rats.

Conclusions:

• Modafinil ameliorated depression-like behaviors and cognitive deficits in a rat model.
• These findings suggest modafinil may benefit the treatment of cognitive residual symptoms in affective disorders.
• Further research is warranted to explore modafinil's therapeutic potential in human depression.