Ciproxifan improves working memory through increased prefrontal cortex neural activity in sleep-restricted mice.

Area of Science:

• Neuroscience
• Pharmacology

Background:

• Histamine H3 receptor (H3) antagonists show promise for treating sleep disorders.
• Limited research exists on their cognitive effects post-sleep restriction and neural network impacts.

Purpose of the Study:

• To investigate the cognitive effects of an H3 antagonist (ciproxifan) after acute sleep restriction.
• To examine the impact of ciproxifan on neural activation within specific brain regions.

Main Methods:

• Mice underwent 20 hours of acute sleep restriction.
• Following restriction, mice received ciproxifan (3 mg/kg) and were tested on a working memory task.
• Brain tissue was analyzed using Fos immunohistochemistry to assess neuronal activation.

Main Results:

• Sleep restriction reduced slow-wave sleep and impaired working memory at longer intervals.
• Ciproxifan administration prevented working memory deficits in sleep-restricted mice.
• Fos expression increased in prefrontal cortex areas (prelimbic, infralimbic, cingulate cortex) after ciproxifan treatment.

Conclusions:

• Ciproxifan (3 mg/kg) ameliorates working memory deficits induced by sleep restriction.
• The cognitive benefits are linked to specific modulations of prefrontal cortex activity.