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Circ J. 2020 Jan 9. doi: 10.1253/circj.CJ-19-0758. [Epub ahead of print]

Pulsed Electromagnetic Fields Increase Angiogenesis and Improve Cardiac Function After Myocardial Ischemia in Mice.

Peng L1,2, Fu C1,3, Liang Z1,2, Zhang Q1,2, Xiong F1,2, Chen L1,2, He C1,2, Wei Q1,2.

Author information

1
Department of Rehabilitation Medicine Center, West China Hospital, Sichuan University.
2
Key Laboratory of Rehabilitation Medicine in Sichuan Province.
3
State Key Laboratory of Biotherapy, West China Hospital, Sichuan University.

Abstract

BACKGROUND:

Previous studies have shown that pulsed electromagnetic fields (PEMF) stimulate angiogenesis and may be a potential treatment strategy to improve cardiac function after myocardial infarction (MI). This study explored the effects and its related mechanisms of PEMF in MI mice.Methods and Results:MI mice were used in PEMF treatment (15 Hz 1.5 mT PEMF or 30 Hz 3.0 mT PEMF) for 45 min per day for 2 weeks. Furthermore, an in vivo Matrigel plug assay was used to observe the effect of PEMF in promoting angiogenesis. Compared with the sham PEMF group, PEMF treatment with 30 Hz 3.0 mT significantly improved heart function. PEMF treatment with 15 Hz 1.5 mT and 30 Hz 3.0 mT both increased capillary density, decreased infarction area size, increased the protein expression of vascular endothelial growth factor (VEGF), vascular endothelial growth factor receptor 2 (VEGFR2), Ser473-phosphorylated Akt (pSer473-Akt) and S1177-phosphorylated endothelial nitric oxide synthase (pS1177-eNOS), and increased the mRNA level of VEGF and hypoxia inducible factor 1-alpha (HIF-1α) in the infarct border zone. Additionally, treatment with 30 Hz 3.0 mT also increased protein and mRNA level of fibroblast growth factor 2 (FGF2), and protein level of β1 integrin, and shows a stronger therapeutic effect.

CONCLUSIONS:

PEMF treatment could promote angiogenesis of the infarct border zone and improve cardiac function in MI mice. A treatment parameter of 30 Hz 3.0 mT is remarkably effective in MI mice. The effect is associated with the proangiogenic signaling pathways of HIF-1α/VEGF/Akt/eNOS or HIF-1α/FGF2/Akt/eNOS.

KEYWORDS:

Angiogenesis; Cardiac rehabilitation; Electromagnetic fields; Ischemic heart disease; Myocardial infarction

PMID:
31915323
DOI:
10.1253/circj.CJ-19-0758
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