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

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.

AI evidence extraction

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

Suggested hubs

• pemf-therapeutics (0.9)
  Study evaluates a specific pulsed electromagnetic field waveform as a noninvasive therapeutic intervention.

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    "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": 0.66000000000000003108624468950438313186168670654296875,
    "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": [
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