Growth stage dependent effects of electromagnetic fields on DNA synthesis of Jurkat cells.

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "ELF",
    "source": "other",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Jurkat (E 6.1) cells",
  "sample_size": null,
  "outcomes": [
    "DNA synthesis",
    "[3H] thymidine uptake"
  ],
  "main_findings": "A 1.8 mT bone-healing electromagnetic field and 60 Hz power-frequency fields at 0.1 and 0.4 mT significantly inhibited DNA synthesis ([3H] thymidine uptake) in otherwise unstimulated Jurkat cells. Inhibition was most prominent in mid log phase cells, with ~50% inhibition reported for the bone-healing EMF in complete medium versus ~20–25% for 60 Hz fields; cells in conditioned medium showed up to ~60% inhibition. The 0.1 and 0.4 mT 60 Hz effects were reported as very similar, suggesting saturation at 0.1 mT or lower.",
  "effect_direction": "harm",
  "limitations": [
    "In vitro cell model; findings may not generalize to in vivo or human health outcomes.",
    "Exposure duration and detailed exposure characterization beyond field strength/frequency are not provided in the abstract.",
    "Sample size and replication details are not provided in the abstract."
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "Jurkat cells",
    "DNA synthesis",
    "thymidine uptake",
    "ELF EMF",
    "60 Hz",
    "bone healing electromagnetic field",
    "millitesla",
    "growth phase dependence"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.2,
      "reason": "Study involves power-frequency (60 Hz) ELF magnetic fields, which are relevant to occupational ELF exposure contexts, though this is an in vitro experiment."
    }
  ]
}