Effects of electromagnetic fields on proteoglycan metabolism of bovine articular cartilage explants.

Connective tissue research · 2003 · Benefit · Low evidence

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BenefitLow evidencePaper 5260

Study snapshot

PublicationConnective tissue research · 2003

Study typein_vitro

Reported directionBenefit

Evidence ratingLow

Abstract

Electromagnetic field (EMF) exposure has been proposed for the treatment of osteoarthritis. In this study, we investigated the effects of EMF (75 Hz, 2,3 mT) on proteoglycan (PG) metabolism of bovine articular cartilage explants cultured in vitro, both under basal conditions and in the presence of interleukin-1beta (IL-1beta) in the culture medium. Proteoglycan synthesis and the residual PG tissue content resulted significantly higher in EMF-exposed explants than in controls, whereas no effect was observed on PG release and nitric oxide (NO) production. IL-1beta induced both a reduction in PG synthesis and an increase in PG release, related to a strong stimulation of NO production, which resulted in a net loss of tissue PG content. In IL-1beta-treated explants, EMF increased PG synthesis, whereas in spite of a slight stimulation of NO production EMF did not modify PG release. This resulted in the residual PG tissue content being maintained at the control level. In both experimental conditions, the effects of EMF were associated with an increase in lactate production. The results of our study show that EMFs are able to promote anabolic activities and PG synthesis in bovine articular cartilage explants. This effect also is maintained in the presence of IL-1beta, thus counteracting the catabolic activity of the cytokine. Altogether, these data suggest that EMF exposure exerts a chondroprotective effect on articular cartilage in vitro.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typein_vitro

Effect directionbenefit

PopulationBovine articular cartilage explants (in vitro)

Sample sizeNot supplied

ExposureELF · 0.075 MHz

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Exposure to EMF (75 Hz, 2.3 mT) significantly increased proteoglycan synthesis and residual PG tissue content versus controls, with no observed effect on PG release or NO production under basal conditions. In IL-1beta-treated explants, EMF increased PG synthesis and maintained residual PG tissue content at control levels, while not modifying PG release despite a slight stimulation of NO production; EMF was associated with increased lactate production in both conditions.

Outcomes measured

Proteoglycan (PG) synthesis
Residual PG tissue content
PG release
Nitric oxide (NO) production
Lactate production

Limitations

In vitro explant model (bovine cartilage), which may not generalize to in vivo or human osteoarthritis
Exposure duration not reported in the abstract
Sample size not reported in the abstract

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": 0.075,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Bovine articular cartilage explants (in vitro)",
  "sample_size": null,
  "outcomes": [
    "Proteoglycan (PG) synthesis",
    "Residual PG tissue content",
    "PG release",
    "Nitric oxide (NO) production",
    "Lactate production"
  ],
  "main_findings": "Exposure to EMF (75 Hz, 2.3 mT) significantly increased proteoglycan synthesis and residual PG tissue content versus controls, with no observed effect on PG release or NO production under basal conditions. In IL-1beta-treated explants, EMF increased PG synthesis and maintained residual PG tissue content at control levels, while not modifying PG release despite a slight stimulation of NO production; EMF was associated with increased lactate production in both conditions.",
  "effect_direction": "benefit",
  "limitations": [
    "In vitro explant model (bovine cartilage), which may not generalize to in vivo or human osteoarthritis",
    "Exposure duration not reported in the abstract",
    "Sample size not reported in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electromagnetic field",
    "ELF-EMF",
    "75 Hz",
    "2.3 mT",
    "bovine",
    "articular cartilage",
    "explant",
    "proteoglycan",
    "interleukin-1beta",
    "nitric oxide",
    "lactate",
    "osteoarthritis"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: Not supplied
PubMed: 14504035

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