Adaptive and regulatory mechanisms in aged rats with postoperative cognitive dysfunction

Area of Science:

• Neuroscience
• Immunology
• Gerontology

Background:

• Postoperative cognitive dysfunction (POCD) is a significant concern, particularly in aged populations.
• Inflammation is increasingly recognized as a potential contributor to neurological disorders, including POCD.
• Specific inflammatory mediators like 5' adenosine monophosphate-activated protein kinase (AMPK), nuclear factor-kappa B (NF-κB), interleukin-1β (IL-1β), and tumor necrosis factor-α (TNF-α) are implicated in inflammatory pathways.

Purpose of the Study:

• To investigate the role of specific inflammatory mediators in the development of POCD in aged rats following splenectomy.
• To examine the temporal expression of AMPK, NF-κB, IL-1β, and TNF-α in the hippocampus after splenectomy in aged rats.

Main Methods:

• A splenectomy model was established in aged rats to induce POCD.
• Western immunoblot analysis was employed to quantify the expression levels of AMPK, NF-κB, IL-1β, and TNF-α in hippocampal tissue.
• Hippocampal tissue was collected at various time points (1-7 days) post-splenectomy.

Main Results:

• Expression of 5' adenosine monophosphate-activated protein kinase (AMPK) and nuclear factor-kappa B (NF-κB) was elevated in the hippocampus 1-7 days after splenectomy.
• Interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) levels were upregulated post-splenectomy, showing a gradual decrease over time.
• The observed changes in these inflammatory mediators suggest their involvement in the splenectomy-induced POCD model.

Conclusions:

• The study provides evidence that splenectomy induces an inflammatory response in the hippocampus of aged rats.
• These inflammatory changes, involving AMPK, NF-κB, IL-1β, and TNF-α, are associated with the development of POCD in this model.
• Targeting these inflammatory pathways may offer therapeutic strategies for preventing or treating POCD in elderly patients undergoing surgery.