[Autoimmune processes after long-term low-level exposure to electromagnetic fields (the results of an experiment). Part 3. The effect of the long-term non-thermal RF EMF exposure on complement-fixation antibodies against homologenous tissue].

Radiatsionnaia biologiia, radioecologiia · 2010 · Mixed · Low evidence

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MixedLow evidencePaper 4390

Study snapshot

PublicationRadiatsionnaia biologiia, radioecologiia · 2010

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

This paper presents the results of the study of immunological effects of long-term low-level exposure of rats to microwaves. Rats were exposed in the far field to 2450 MHz continuous wave fields providing an incident power density at the cages of 500 microW/cm2 for 7 hours daily for a total of 30 days, resulting in a whole-body SAR of 0.16 +/- 0.04 W/kg. Effects of the exposure on immunological parameters in the brain and liver of rats were studied using Complement Fixation Test at low temperature (4 degrees C). Three groups ("EMF-exposure", "sham-exposure" and cage-control) were formed, each consisting of 16 rats. On the 14th day after the 30-day exposure, titers of antibodies against brain tissue were 0.69 +/- 0.08 in the cage-control group, 0.89 +/- 0.05 in the sham-exposed group and 1.19 +/- 0.07 in the EMF-exposed group. The appearance of antibodies against liver antigens was less. The increase in titres of antibodies against brain homogenates in the sham-exposed and EMF-exposed groups could be explained by the stress-reaction of the animals and autoimmunization of organism.

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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 directionmixed

PopulationRats

Sample size48

Exposuremicrowave · 2450 MHz · 0.16 W/kg · 7 hours daily for 30 days (assessed 14 days after exposure)

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Rats exposed to 2450 MHz continuous-wave fields (incident power density 500 microW/cm2; whole-body SAR 0.16 +/- 0.04 W/kg) for 7 h/day for 30 days had higher complement-fixation antibody titers against brain tissue on day 14 post-exposure (1.19 +/- 0.07) than sham-exposed (0.89 +/- 0.05) and cage-control (0.69 +/- 0.08) groups. Antibodies against liver antigens were reported as less apparent.

Outcomes measured

Complement-fixation antibody titers against brain tissue
Complement-fixation antibody titers against liver antigens

Limitations

Only antibody titers via complement fixation test are reported; clinical/functional autoimmune outcomes are not described in the abstract
Sham-exposed group also showed increased antibody titers versus cage-control, suggesting stress or other non-EMF factors may contribute
Short follow-up reported (14 days after exposure)
Details of randomization/blinding and statistical testing are not provided in the abstract

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": 2450,
    "sar_wkg": 0.16,
    "duration": "7 hours daily for 30 days (assessed 14 days after exposure)"
  },
  "population": "Rats",
  "sample_size": 48,
  "outcomes": [
    "Complement-fixation antibody titers against brain tissue",
    "Complement-fixation antibody titers against liver antigens"
  ],
  "main_findings": "Rats exposed to 2450 MHz continuous-wave fields (incident power density 500 microW/cm2; whole-body SAR 0.16 +/- 0.04 W/kg) for 7 h/day for 30 days had higher complement-fixation antibody titers against brain tissue on day 14 post-exposure (1.19 +/- 0.07) than sham-exposed (0.89 +/- 0.05) and cage-control (0.69 +/- 0.08) groups. Antibodies against liver antigens were reported as less apparent.",
  "effect_direction": "mixed",
  "limitations": [
    "Only antibody titers via complement fixation test are reported; clinical/functional autoimmune outcomes are not described in the abstract",
    "Sham-exposed group also showed increased antibody titers versus cage-control, suggesting stress or other non-EMF factors may contribute",
    "Short follow-up reported (14 days after exposure)",
    "Details of randomization/blinding and statistical testing are not provided in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "rats",
    "microwaves",
    "RF EMF",
    "2450 MHz",
    "continuous wave",
    "non-thermal exposure",
    "SAR",
    "complement fixation test",
    "autoantibodies",
    "brain tissue",
    "liver antigens",
    "stress reaction"
  ],
  "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: 20297676

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