Effect of electromagnetic fields on human osteoarthritic and non-osteoarthritic chondrocytes.

Abstract

BACKGROUND: Studies of the effects of electromagnetic fields (EMFs) on cartilaginous cells show a broad range of outcomes. However EMFs are not yet clinically applied as standard treatment of osteoarthritis, as EMF effects are showing varying outcomes in the literature. The aim of this study was to examine effects of EMFs (5 mT or 8 mT) on osteoarthritic (OA) and non-OA chondrocytes in order to investigate whether EMF effects are related to chondrocyte and EMF quality. METHODS: Pellets of human OA and non-OA chondrocytes were exposed to a sinusoidal 15 Hz EMF produced by a solenoid. Control groups were cultivated without EMF under standard conditions for 7 days. Cultures were examined by staining, immunohistochemistry and quantitative real-time PCR for RNA corresponding to cartilage specific proteins (COL2A1, ACAN, SOX9). RESULTS: OA chondrocytes increased the expression of COL2A1 and ACAN under 5 mT EMF compared to control. In contrast no changes in gene expression were observed in non-OA chondrocytes. OA and non-OA chondrocytes showed no significant changes in gene expression under 8 mT EMF. CONCLUSION: A 5 mT EMF increased the expression of cartilage specific genes in OA chondrocytes whereas in non-OA chondrocytes no changes in gene expression were observed. An 8 mT EMF however showed no effect altogether. This suggests that EMF effects are related to EMF but also to chondrocyte quality. Further studies about the clinical relevance of this effect are necessary.

AI evidence extraction

Main findings

Exposure to a sinusoidal 15 Hz EMF at 5 mT increased COL2A1 and ACAN expression in OA chondrocytes versus control, while non-OA chondrocytes showed no gene expression changes. Under 8 mT EMF, neither OA nor non-OA chondrocytes showed significant gene expression changes.

Outcomes measured

• Gene expression of cartilage-specific markers (COL2A1, ACAN, SOX9)
• Histology/staining
• Immunohistochemistry

Limitations

• In vitro pellet culture study; clinical relevance not established in the abstract
• Sample size not reported in the provided abstract
• Only two magnetic flux densities (5 mT, 8 mT) and one frequency (15 Hz) tested
• Outcomes limited to selected cartilage-related gene expression markers and related assays

Suggested hubs

• elf-emf (0.9)
  Sinusoidal 15 Hz magnetic field exposure at mT levels.
• osteoarthritis (0.6)
  Study compares osteoarthritic vs non-osteoarthritic chondrocytes and cartilage gene expression.

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        "sar_wkg": null,
        "duration": "7 days"
    },
    "population": "Human osteoarthritic (OA) and non-osteoarthritic chondrocytes (pellet cultures)",
    "sample_size": null,
    "outcomes": [
        "Gene expression of cartilage-specific markers (COL2A1, ACAN, SOX9)",
        "Histology/staining",
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    ],
    "main_findings": "Exposure to a sinusoidal 15 Hz EMF at 5 mT increased COL2A1 and ACAN expression in OA chondrocytes versus control, while non-OA chondrocytes showed no gene expression changes. Under 8 mT EMF, neither OA nor non-OA chondrocytes showed significant gene expression changes.",
    "effect_direction": "mixed",
    "limitations": [
        "In vitro pellet culture study; clinical relevance not established in the abstract",
        "Sample size not reported in the provided abstract",
        "Only two magnetic flux densities (5 mT, 8 mT) and one frequency (15 Hz) tested",
        "Outcomes limited to selected cartilage-related gene expression markers and related assays"
    ],
    "evidence_strength": "low",
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    "peer_reviewed_likely": "yes",
    "keywords": [
        "electromagnetic fields",
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        "osteoarthritis",
        "COL2A1",
        "ACAN",
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        "cartilage"
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