A Role for the Adenosine ADORA2B Receptor in Midazolam Induced Cognitive Dysfunction

Area of Science:

• Neuroscience
• Pharmacology
• Chronobiology

Background:

• Previous research implicated the circadian rhythm protein Period 2 (PER2) in midazolam-induced cognitive dysfunction.
• The adenosine A2B receptor (ADORA2B) is known to regulate PER2, suggesting its involvement in cognitive processes.

Purpose of the Study:

• To investigate the role of hippocampal ADORA2B in cognitive function.
• To determine if ADORA2B modulation can ameliorate midazolam-induced cognitive deficits.

Main Methods:

• Assessed hippocampal Adora2b and Per2 mRNA expression in midazolam-treated mice.
• Evaluated spontaneous T-maze alternation in Adora2b knockout mice and after ADORA2B agonist treatment.
• Examined hippocampal inflammatory markers and C-fos expression in Adora2b knockout mice.

Main Results:

• Midazolam treatment downregulated hippocampal Adora2b and Per2 mRNA.
• Adora2b knockout mice exhibited reduced PER2 expression and impaired T-maze alternation.
• The ADORA2B agonist BAY-60-6583 reversed midazolam-induced cognitive deficits.
• C-fos, a memory-related gene, was downregulated in Adora2b knockout mice, but no inflammatory phenotype was observed.

Conclusions:

• ADORA2B is implicated in midazolam-induced cognitive dysfunction.
• BAY-60-6583 treatment shows potential for restoring cognitive function, possibly through PER2 modulation.
• C-FOS downregulation may also contribute to memory impairment, suggesting ADORA2B agonists as a therapeutic avenue.