Modulation of MCP-1 and iNOS by 50-Hz sinusoidal electromagnetic field.

Nitric oxide : biology and chemistry · 2006 · Mixed · Low evidence

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MixedLow evidencePaper 5141

Overnight exposure to a 1 mT, 50 Hz sinusoidal EMF altered expression of iNOS and MCP-1 in cultured human mononuclear cells. iNOS was down-regulated at both mRNA and protein levels, while MCP-1 was up-regulated.

Study snapshot

PublicationNitric oxide : biology and chemistry · 2006

Study typein_vitro

Reported directionMixed

Evidence ratingLow

Abstract

The purpose of this study was to investigate whether overnight exposure to 1 mT-50 Hz extremely low-frequency sinusoidal electromagnetic field (EMF) affects the expression and production of inducible nitric oxide synthase (iNOS) and monocyte chemotactic protein-1 (MCP-1) in human monocytes. RT-PCR and Western blot analysis demonstrate that EMF exposure affects the expression of iNOS and MCP-1 in cultured human mononuclear cells at the mRNA level and protein synthesis. Interestingly, the effects of EMF exposure clearly differed with respect to the potentiation and inhibition of iNOS and MCP-1 expression. Whereas iNOS was down-regulated both at the mRNA level and at the protein level, MCP-1 was up-regulated. These results provide helpful information regarding the EMF-mediated modulation of the inflammatory response in vivo. However, additional studies are necessary to demonstrate that EMF acts as a nonpharmacological inhibitor of NO and inducer of MCP-1 in some diseases where the balance of MCP-1 and NO may be important.

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 directionmixed

PopulationCultured human monocytes / human mononuclear cells

Sample sizeNot supplied

ExposureELF · 0.05 MHz · overnight

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

iNOS expression (mRNA and protein)
MCP-1 expression (mRNA and protein)

Limitations

In vitro study in cultured human cells; in vivo relevance not established in the abstract
Sample size and experimental replication not reported in the abstract
Exposure details beyond field strength, frequency, and overnight duration not provided

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": 0.05,
    "sar_wkg": null,
    "duration": "overnight"
  },
  "population": "Cultured human monocytes / human mononuclear cells",
  "sample_size": null,
  "outcomes": [
    "iNOS expression (mRNA and protein)",
    "MCP-1 expression (mRNA and protein)"
  ],
  "main_findings": "Overnight exposure to a 1 mT, 50 Hz sinusoidal EMF altered expression of iNOS and MCP-1 in cultured human mononuclear cells. iNOS was down-regulated at both mRNA and protein levels, while MCP-1 was up-regulated.",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro study in cultured human cells; in vivo relevance not established in the abstract",
    "Sample size and experimental replication not reported in the abstract",
    "Exposure details beyond field strength, frequency, and overnight duration not provided"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "extremely low-frequency",
    "ELF-EMF",
    "50 Hz",
    "1 mT",
    "sinusoidal electromagnetic field",
    "human monocytes",
    "human mononuclear cells",
    "iNOS",
    "inducible nitric oxide synthase",
    "MCP-1",
    "monocyte chemotactic protein-1",
    "inflammation",
    "RT-PCR",
    "Western blot"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.25,
      "reason": "Study involves 50 Hz ELF exposure, which can be relevant to power-frequency/occupational EMF contexts, though no specific workplace source is stated."
    }
  ]
}

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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: 10.1016/j.niox.2005.11.010
PubMed: 16455275

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