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Repetitive magnetic stimulation promotes the proliferation of neural progenitor cells via modulating the expression of miR-106b.
International Journal of Molecular Medicine 2018 December
Increasing evidence shows that repetitive transcranial magnetic stimulation (rTMS) promotes neurogenesis and the expression of microRNA (miR)‑106b. The present study investigated whether rTMS promotes the proliferation of neural progenitor cells (NPCs) and whether the effect is associated with the expression of miR‑106b. NPCs were cultured from the rat hippocampus and exposed to rTMS daily, comprising 1,000 stimuli for 3 days at 10 Hz, with 1.75 T output. The proliferation ability of the NPCs was revealed by EdU staining, and the levels of miR‑106b and downstream gene p21 in the NPCs were measured by reverse transcription‑quantitative polymerase chain reaction and western blot analyses. For analysis of the mechanism, the NPCs were transfected with Lenti‑miR‑106b or small interfering RNAs prior to rTMS. The results showed that: i) rTMS increased NPC proliferation, as revealed by the increased proportion of EdU‑positive cells; ii) rTMS was able to upregulate the expression of miR‑106b and downregulate the level of p21 in NPCs; iii) overexpression of miR‑106b further enhanced the effects of rTMS, whereas knockdown of miR‑106b had the opposite effects. Taken together, these data indicated that rTMS can promote NPC proliferation by upregulating the expression of miR‑106b and possibly inhibiting the expression of p21.
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