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BI JIAQI, JING HONG, ZHOU CHENLIANG, GAO PENG, HAN FUJUN, LI GANG, SHI DONGFANG. EFFECT OF LOW-FREQUENCY ELECTROMAGNETICS (LFE) ON MUSCLE SATELLITE CELLS DIFFERENTIATION AND IMMUNE SYSTEM IN RAT. J MECH MED BIOL 2021. [DOI: 10.1142/s0219519421400546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Spinal cord injury (SCI) is a severe neurological disease. Although surgery within 8[Formula: see text]h after SCI can substantially reduce paraplegia, most patients still suffer from hypomusculariasis after neuron recovery, which results in insufficient lower limb muscles to support bodyweight. Currently, there is no effective method to prevent muscle atrophy. Previous studies have shown that low-frequency electromagnetics (LFE) can stimulate the differentiation, proliferation and fusion of muscle satellite cells, however, the optimal electromagnetic strength and effects on the immune system have not been established. Here, we investigated the influence of LFE at different electromagnetic strengths on muscle cell recovery and assessed the impact of chronic LFE on the immune system of SCI rats. The rat immune system was rapidly activated after SCI. High-energy LFE provoked intensive immune responses, while low-energy LFE did not affect immune responses. Simultaneously, LFE effectively prevented myotube reduction and atrophy in SCI rats. The mRNA and protein levels of Pax7 and MyoD were increased after LFE at both high and low electromagnetic strengths, with the latter leading to more robust increases. Indeed, LFE remarkably induced muscle cell fusion. Together, our results demonstrated that LFE activates muscle satellite cells via stimulating myogenic factors. Chronic low-energy LFE is a safe therapy with no adverse impact on the immune system of SCI rats. LFE with 1.5 mT energy should be considered as an optimal therapeutic strategy.
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Affiliation(s)
- JIAQI BI
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, Heilongjiang, P. R. China
- Harbin Children’s Hospital, Harbin 150010, Heilongjiang, P. R. China
| | - HONG JING
- Harbin Children’s Hospital, Harbin 150010, Heilongjiang, P. R. China
| | - CHENLIANG ZHOU
- Emergency Department, SongBei Hospital of The Fourth Hospital, Affiliated of Harbin Medical University, Harbin 150021, Heilongjiang, P. R. China
| | - PENG GAO
- The First Department of General Surgery, Harbin Children’s Hospital, Harbin 150010, Heilongjiang, P. R. China
| | - FUJUN HAN
- Emergency Department, SongBei Hospital of The Fourth Hospital, Affiliated of Harbin Medical University, Harbin 150021, Heilongjiang, P. R. China
| | - GANG LI
- The Second Department of Orthopedics, The First Hospital of Yichun Yichun, 153000, Heilongjiang, P. R. China
| | - DONGFANG SHI
- College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, Heilongjiang, P. R. China
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