High-specificity protection against radiation-induced bone loss by a pulsed electromagnetic field.

Science advances · 2022 · Benefit · Low evidence

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BenefitLow evidencePaper 5729

Study snapshot

PublicationScience advances · 2022

Study typeanimal

Reported directionBenefit

Evidence ratingLow

Abstract

Radiotherapy increases tumor cure and survival rates; however, radiotherapy-induced bone damage remains a common issue for which effective countermeasures are lacking, especially considering tumor recurrence risks. We report a high-specificity protection technique based on noninvasive electromagnetic field (EMF). A unique pulsed-burst EMF (PEMF) at 15 Hz and 2 mT induces notable Ca oscillations with robust Ca spikes in osteoblasts in contrast to other waveforms. This waveform parameter substantially inhibits radiotherapy-induced bone loss by specifically modulating osteoblasts without affecting other bone cell types or tumor cells. Mechanistically, primary cilia are identified as major PEMF sensors in osteoblasts, and the differentiated ciliary expression dominates distinct PEMF sensitivity between osteoblasts and tumor cells. PEMF-induced unique Ca oscillations depend on interactions between ciliary polycystins-1/2 and endoplasmic reticulum, which activates the Ras/MAPK/AP-1 axis and subsequent DNA repair Ku70 transcription. Our study introduces a previously unidentified method against radiation-induced bone damage in a noninvasive, cost-effective, and highly specific manner.

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 typeanimal

Effect directionbenefit

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthLowConfidence: 66% · Peer reviewed: yes

Main findings

A pulsed-burst PEMF at 15 Hz and 2 mT induced notable calcium oscillations with robust spikes in osteoblasts compared with other waveforms. This PEMF parameter substantially inhibited radiotherapy-induced bone loss by specifically modulating osteoblasts without affecting other bone cell types or tumor cells; primary cilia were identified as major PEMF sensors in osteoblasts, linking to Ras/MAPK/AP-1 activation and Ku70 transcription.

Outcomes measured

Radiotherapy-induced bone loss
Calcium (Ca) oscillations/spikes in osteoblasts
Effects on other bone cell types
Effects on tumor cells
Primary cilia involvement in PEMF sensing
Activation of Ras/MAPK/AP-1 axis
Ku70 transcription / DNA repair pathway activation

Limitations

Sample size not reported in abstract
Study design details (e.g., randomization/blinding) not described in abstract
Exposure duration and regimen not specified in abstract
Population/species and model details not provided in abstract

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": null,
    "source": "pulsed electromagnetic field (PEMF)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Radiotherapy-induced bone loss",
    "Calcium (Ca) oscillations/spikes in osteoblasts",
    "Effects on other bone cell types",
    "Effects on tumor cells",
    "Primary cilia involvement in PEMF sensing",
    "Activation of Ras/MAPK/AP-1 axis",
    "Ku70 transcription / DNA repair pathway activation"
  ],
  "main_findings": "A pulsed-burst PEMF at 15 Hz and 2 mT induced notable calcium oscillations with robust spikes in osteoblasts compared with other waveforms. This PEMF parameter substantially inhibited radiotherapy-induced bone loss by specifically modulating osteoblasts without affecting other bone cell types or tumor cells; primary cilia were identified as major PEMF sensors in osteoblasts, linking to Ras/MAPK/AP-1 activation and Ku70 transcription.",
  "effect_direction": "benefit",
  "limitations": [
    "Sample size not reported in abstract",
    "Study design details (e.g., randomization/blinding) not described in abstract",
    "Exposure duration and regimen not specified in abstract",
    "Population/species and model details not provided in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.66,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "pulsed electromagnetic field",
    "PEMF",
    "15 Hz",
    "2 mT",
    "radiotherapy",
    "bone loss",
    "osteoblasts",
    "calcium oscillations",
    "primary cilia",
    "Ras/MAPK/AP-1",
    "Ku70",
    "DNA repair"
  ],
  "suggested_hubs": [
    {
      "slug": "pemf-therapeutics",
      "weight": 0.9,
      "reason": "Study evaluates a specific pulsed electromagnetic field waveform as a noninvasive therapeutic intervention."
    }
  ]
}

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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: 10.1126/sciadv.abq0222
PubMed: 36001662

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