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Magnetic Field Exposure Modulates the Anti-Inflammatory Efficiency of Minocycline in Rats with Peripheral Acute Inflammation

Tufan Mert, PhD; Mehmet Sahin, PhD; Emel Sahin, PhD; Selma Yaman, PhD

Background and Objective • Microglial activation in spinal cord is key contributor and its inhibition by Minocycline (MCN) can result in anti-inflammatory actions. Effect of pulsed magnetic field (PMF) in living system is a very complex process and many biological and cellular processes can play key roles. In this study aimed to reveal the roles of PMF exposure on anti-inflammatory potentials of MCN treatment by evaluating the inflammatory profiles of either inflamed site or spinal cord. Methods • In this study, we investigated the anti-inflammatory effects of PMF, MCN or their combination treatments in rats with carrageenan (CG)-induced peripheral inflammation by examining the cardinal signs, hyperalgesia, allodynia, edema and fever. The levels of various inflammation markers (tumor necrosis factor-a), interleukin (IL)-1ß, IL-6, IL-17, IL-4, IL-10, C-C motif chemokine ligand3 (CCL3), C-X-C motif chemokine ligand1 and myeloperoxidase were also measured in paw and spinal cord tissues. Results • CG induced inflammation caused edema, fever, and hypersensitivities. MNC or PMF treatments ameliorated these responses by suppressing pro-inflammatory markers in both inflamed paw and spinal cord. Although anti-hypersensitive, anti-edematous and anti-pyretic actions of MCN or PMF, in combined treatments PMF exposure decreased the anti-hyperalgesic and anti-allodynic actions of MCN treatment. These may be associated with decreases in IL-4 and IL-10 levels and an increase in CCL3 level of spinal cord tissues. Conclusion • Present findings support that MCN or PMF has anti-inflammatory properties duo to the down-regulating central microglial and/or peripheral inflammatory markers. Our data showed here, for the first time, PMF exposure may suppress the anti-hypersensitive actions of MCN by modulating microglia function/phenotype and microglial markers.

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