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Immunomodulatory effectiveness of azithromycin in prevention of postlaminectomy epidural fibrosis
Hakan Emmez1, Alp Özgün Börcek, Emre Durdağ
1Department of Neurosurgery, Gazi University Faculty of Medicine, Ankara, Turkey.
Objective:
One of the important causes of failed back surgery is the extensive peridural fibrosis collecting in the surgical field after spinal surgeries. Today we know that inflammatory mechanisms mediated by the immune system of the body plays an important role in generation of fibrosis. Azithromycin, a macrolide antibiotic, has proven immunomodulatory effects in various diseases. This study aims to investigate the effects of azithromycin on peridural fibrosis.
Methods:
Twenty-four Wistar rats received laminectomies before dividing them into three groups randomly. Animals of the control group received normal saline intraperitoneally while animals in the treatment groups received low (20 mg/kg) and high (80 mg/kg) doses of azithromycin intraperitoneally after surgical interventions. The amount of fibrosis, fibroblast density and inflammatory cell density were analyzed histologically.
Results:
Analysis demonstrated significantly reduced fibrosis, fibroblast density and inflammatory cell density in treatment groups compared to the control group. There was no difference between the treatment groups.
Conclusion:
Immune system plays critical roles in tissue repair and fibrogenesis. Results of our study demonstrated that azithromycin application reduced formation of peridural fibrosis in experimental laminectomy model in rats. Further studies with different dose regimes and different application routes are required to carry these results to an advanced level.
Insights
Azithromycin significantly reduced peridural fibrosis and inflammation after spinal surgery in rats. This macrolide antibiotic shows promise in mitigating post-surgical scar tissue formation.
Area of Science:
- Immunology
- Regenerative Medicine
- Pharmacology
Background:
- Peridural fibrosis is a common complication following spinal surgery, often leading to failed back surgery syndrome.
- Inflammatory mechanisms orchestrated by the immune system are key drivers in the development of post-surgical fibrosis.
- Azithromycin, a macrolide antibiotic, possesses known immunomodulatory properties relevant to tissue repair.
Purpose of the Study:
- To investigate the efficacy of azithromycin in preventing or reducing peridural fibrosis after laminectomy.
- To evaluate the impact of azithromycin on fibroblast and inflammatory cell density in the surgical site.
Main Methods:
- A randomized controlled study involving 24 Wistar rats undergoing laminectomy.
- Administration of low (20 mg/kg) and high (80 mg/kg) doses of azithromycin or normal saline intraperitoneally.
- Histological analysis to quantify fibrosis, fibroblast density, and inflammatory cell density.
Main Results:
- Significantly lower levels of fibrosis, fibroblast density, and inflammatory cells were observed in azithromycin-treated groups compared to the control group.
- No significant difference in outcomes was noted between the low and high azithromycin dose groups.
Conclusions:
- Azithromycin administration effectively reduced the formation of peridural fibrosis in a rat laminectomy model.
- The findings highlight the role of the immune system in fibrogenesis and suggest azithromycin as a potential therapeutic agent.
- Further research exploring varied dosages and administration routes is warranted to optimize clinical application.
