Thalidomide alleviates postoperative pain and spatial memory deficit in aged rats

Area of Science:

• Neuroscience
• Pharmacology
• Gerontology

Background:

• Post-operative cognitive dysfunction (POCD) is a significant concern in the elderly.
• Pain is a primary risk factor contributing to POCD development.
• Understanding the mechanisms underlying POCD is crucial for developing preventative strategies.

Purpose of the Study:

• To investigate the efficacy of thalidomide in mitigating POCD in aged rats.
• To explore the underlying neurobiological mechanisms of thalidomide's effects on POCD.
• To assess thalidomide's impact on pain, spatial memory, and specific molecular targets.

Main Methods:

• Aged rat model of POCD induced by laparotomy.
• Administration of thalidomide post-surgery.
• Assessment of pain using the Rat Grimace Scale (RGS).
• Evaluation of spatial memory via radial arm maze performance.
• Measurement of inflammatory cytokines and NMDA receptor subunits (NR2A/B) in serum and hippocampus.

Main Results:

• Thalidomide treatment significantly decreased pain behaviors (RGS) and spatial memory errors in POCD rats.
• Thalidomide reduced serum levels of TNF-α and IL-1β but did not affect brain cytokine levels.
• Thalidomide attenuated the upregulation of hippocampal NMDA receptor subunits (NR2A/B).
• The NMDA receptor antagonist MK-801 reversed the memory-protective effects of thalidomide.

Conclusions:

• Thalidomide effectively reduces post-operative pain and prevents spatial memory deficits in aged rats.
• The therapeutic effects of thalidomide on POCD are mediated through long-term regulation of hippocampal NMDA receptors.
• Thalidomide shows potential as a novel therapeutic agent for preventing POCD in the aging population.