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Updated: Mar 22, 2026
A Mouse Model of Orthopedic Surgery to Study Postoperative Cognitive Dysfunction and Tissue Regeneration
Published on: February 27, 2018
Minocycline attenuates post-operative cognitive impairment in aged mice by inhibiting microglia activation
Hui-Lin Wang1, Hua Liu2, Zhang-Gang Xue1
1Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China.
Abstract:
Although it is known that isoflurane exposure or surgery leads to post-operative cognitive dysfunction in aged rodents, there are few clinical interventions and treatments available to prevent this disorder. Minocycline (MINO) produces neuroprotection from several neurodegenerative diseases and various experimental animal models. Therefore, we set out to investigate the effects of MINO pre-treatment on isoflurane or surgery induced cognitive impairment in aged mice by assessing the hippocampal-dependent spatial memory performance using the Morris water maze task. Hippocampal tissues were isolated from mice and evaluated by Western blot analysis, immunofluorescence procedures and protein array system. Our results elucidate that MINO down-regulated the isoflurane-induced and surgery-induced enhancement in the protein levels of pro-inflammatory cytokine tumour necrosis factor alpha, interleukin (IL)-1β, interferon-γ and microglia marker Iba-1, and up-regulated protein levels of the anti-inflammatory cytokine IL-4 and IL-10. These findings suggest that pre-treatment with MINO attenuated isoflurane or surgery induced cognitive impairment by inhibiting the overactivation of microglia in aged mice.
Insights
Minocycline (MINO) pre-treatment protected aged mice from surgery or isoflurane-induced cognitive decline. MINO reduced neuroinflammation by inhibiting microglia activation, preserving spatial memory.
Area of Science:
- Neuroscience
- Pharmacology
- Gerontology
Background:
- Post-operative cognitive dysfunction (POCD) is a common complication in aged individuals following anesthesia or surgery.
- Current clinical interventions for POCD are limited, necessitating the exploration of novel therapeutic strategies.
- Minocycline (MINO) has demonstrated neuroprotective effects in various models of neurodegenerative diseases.
Purpose of the Study:
- To investigate the efficacy of Minocycline (MINO) pre-treatment in preventing isoflurane or surgery-induced cognitive impairment in aged mice.
- To assess the impact of MINO on neuroinflammation markers in the hippocampus.
- To evaluate the effect of MINO on spatial memory performance.
Main Methods:
- Aged mice were pre-treated with Minocycline (MINO) before exposure to isoflurane or surgery.
- Spatial memory was assessed using the Morris water maze task.
- Hippocampal tissues were analyzed using Western blot, immunofluorescence, and protein array to measure inflammatory markers and microglial activation.
Main Results:
- MINO pre-treatment significantly attenuated cognitive deficits in the Morris water maze.
- MINO down-regulated the expression of pro-inflammatory cytokines (tumor necrosis factor-alpha, IL-1β, interferon-γ) and Iba-1 (microglia marker).
- MINO up-regulated the expression of anti-inflammatory cytokines (IL-4, IL-10).
Conclusions:
- Minocycline (MINO) pre-treatment effectively prevents isoflurane or surgery-induced cognitive impairment in aged mice.
- The neuroprotective effects of MINO are mediated by the inhibition of microglial overactivation and reduction of neuroinflammation.
- MINO represents a potential therapeutic agent for mitigating cognitive dysfunction in the elderly following surgical procedures or anesthesia.
