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Pulsed Electromagnetic Field Exposure Reduces Hypoxia and Inflammation Damage in Neuron‐Like and Microglial Cells

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Journal of Cellular Physiology

Published online on

Abstract

In the present study, the effect of low‐frequency, low‐energy pulsed electromagnetic fields (PEMFs) has been investigated by using different cell lines derived from neuron‐like cells and microglial cells. In particular, the primary aim was to evaluate the effect of PEMF exposure in inflammation‐ and hypoxia‐induced injury in two different neuronal cell models, the human neuroblastoma‐derived SH‐SY5Y cells and rat pheochromocytoma PC12 cells and in N9 microglial cells. In neuron‐like cells, live/dead and apoptosis assays were performed in hypoxia conditions from 2 to 48 h. Interestingly, PEMF exposure counteracted hypoxia damage significantly reducing cell death and apoptosis. In the same cell lines, PEMFs inhibited the activation of the hypoxia‐inducible factor 1α (HIF‐1α), the master transcriptional regulator of cellular response to hypoxia. The effect of PEMF exposure on reactive oxygen species (ROS) production in both neuron‐like and microglial cells was investigated considering their key role in ischemic injury. PEMFs significantly decreased hypoxia‐induced ROS generation in PC12, SH‐SY5Y, and N9 cells after 24 or 48 h of incubation. Moreover, PEMFs were able to reduce some of the most well‐known pro‐inflammatory cytokines such as tumor necrosis factor–α (TNF‐α), interleukin (IL)‐1β, IL‐6, and IL‐8 release in N9 microglial cells stimulated with different concentrations of LPS for 24 or 48 h of incubation time. These results show a protective effect of PEMFs on hypoxia damage in neuron‐like cells and an anti‐inflammatory effect in microglial cells suggesting that PEMFs could represent a potential therapeutic approach in cerebral ischemic conditions. J. Cell. Physiol. 232: 1200–1208, 2017. © 2016 Wiley Periodicals, Inc. In the present study, the effect of low‐frequency, low‐energy pulsed electromagnetic fields (PEMFs) has been investigated by using different cell lines derived from neuron‐like cells and microglial cells. PEMF exposure counteracted hypoxia damage significantly reducing cell death and apoptosis, reduced HIF‐1α, ROS, and proinflammatory cytokines. PEMFs could represent a potential therapeutic approach in cerebral ischemic conditions.