Improved osteogenic differentiation by extremely low electromagnetic field exposure: possible application for bone engineering.

Abstract

Human periodontal ligament mesenchymal stem cells (hPDLSCs) are a promising cell type model for regenerative medicine applications due to their anti-inflammatory, immunomodulatory and non-tumorigenic potentials. Extremely low-frequency electromagnetic fields (ELF-EMF) are reported to affect biological properties such as cell proliferation and differentiation and modulate gene expression profile. In this study, we investigated the effects of an intermittent ELF-EMF exposure (6 h/day) for the standard differentiation period (28 days) and for 10 days in hPDLSCs in the presence or not of osteogenic differentiation medium (OM). We evaluated cell proliferation, de novo calcium deposition and osteogenic differentiation marker expression in sham and ELF-EMF-exposed cells. After ELF-EMF exposure, compared with sham-exposed, an increase in cell proliferation rate (p < 0.001) and de novo calcium deposition (p < 0.001) was observed after 10 days of exposure. Real-time PCR and Western blot results showed that COL1A1 and RUNX-2 gene expression and COL1A1, RUNX-2 and OPN protein expression were upregulated respectively in the cells exposed to ELF-EMF exposure along with or without OM for 10 days. Altogether, these results suggested that the promotion of osteogenic differentiation is more efficient in ELF-EMF-exposed hPDLSCs. Moreover, our analyses indicated that there is an early induction of hPDLSC differentiation after ELF-EMF application.

AI evidence extraction

Main findings

Compared with sham exposure, intermittent ELF-EMF exposure increased cell proliferation rate and de novo calcium deposition after 10 days (both p<0.001). COL1A1 and RUNX-2 gene expression and COL1A1, RUNX-2, and OPN protein expression were upregulated in ELF-EMF-exposed cells with or without osteogenic medium, suggesting earlier/more efficient osteogenic differentiation.

Outcomes measured

• Cell proliferation
• De novo calcium deposition
• Osteogenic differentiation marker expression (COL1A1, RUNX-2, OPN)

Limitations

• In vitro study (cell culture), limiting direct inference to human health outcomes
• Key exposure parameters (e.g., field strength, frequency) not reported in the provided abstract
• Sample size and replication details not reported in the provided abstract

{
    "study_type": "in_vitro",
    "exposure": {
        "band": "ELF",
        "source": null,
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": "intermittent exposure 6 h/day for 10 days and for 28 days"
    },
    "population": "Human periodontal ligament mesenchymal stem cells (hPDLSCs)",
    "sample_size": null,
    "outcomes": [
        "Cell proliferation",
        "De novo calcium deposition",
        "Osteogenic differentiation marker expression (COL1A1, RUNX-2, OPN)"
    ],
    "main_findings": "Compared with sham exposure, intermittent ELF-EMF exposure increased cell proliferation rate and de novo calcium deposition after 10 days (both p<0.001). COL1A1 and RUNX-2 gene expression and COL1A1, RUNX-2, and OPN protein expression were upregulated in ELF-EMF-exposed cells with or without osteogenic medium, suggesting earlier/more efficient osteogenic differentiation.",
    "effect_direction": "benefit",
    "limitations": [
        "In vitro study (cell culture), limiting direct inference to human health outcomes",
        "Key exposure parameters (e.g., field strength, frequency) not reported in the provided abstract",
        "Sample size and replication details not reported in the provided abstract"
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "extremely low-frequency electromagnetic fields",
        "ELF-EMF",
        "mesenchymal stem cells",
        "periodontal ligament",
        "osteogenic differentiation",
        "bone engineering",
        "calcium deposition",
        "COL1A1",
        "RUNX-2",
        "OPN"
    ],
    "suggested_hubs": []
}

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