A circular dichroism study of human erythrocyte ghost proteins during exposure to 2450 MHz microwave radiation.

Cell biophysics · 1981 · Harm · Low evidence

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HarmLow evidencePaper 6006

Study snapshot

PublicationCell biophysics · 1981

Study typein_vitro

Reported directionHarm

Evidence ratingLow

Abstract

The effect of 2450 MHz microwave radiation on the proteins of human erythrocyte ghosts has been investigated using circular dichroism spectroscopy. A specially constructed waveguide inserted into the spectropolarimeter allowed the continuous recording of optical activity before, during and after microwave irradiation. The data indicate that high levels of microwave radiation (600 mW/g, specific absorption rate) induce decreases in alpha-helical conformation that may result from both thermal vibrations and increased strain on the intramolecular hydrogen bonds that maintain secondary structure. The latter effect may result from differential intramolecular interactions with the oscillating electric field. Spectrin (bands 1 and 2) isolated from the ghosts was more sensitive to microwave irradiation than intact ghosts, and spectrin-depleted vesicles were the least sensitive. The data, therefore, indicate that the alpha-helical conformation of spectrin is altered by high levels of microwave radiation.

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 directionharm

PopulationHuman erythrocyte ghost proteins (including isolated spectrin)

Sample sizeNot supplied

Exposuremicrowave · 2450 MHz · 600 W/kg

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Using circular dichroism spectroscopy, high-level 2450 MHz microwave irradiation (SAR 600 mW/g) was associated with decreases in alpha-helical conformation in erythrocyte ghost proteins. Isolated spectrin (bands 1 and 2) was reported to be more sensitive than intact ghosts, while spectrin-depleted vesicles were least sensitive, suggesting spectrin alpha-helical conformation is altered under these exposure conditions.

Outcomes measured

Protein secondary structure (alpha-helical conformation) assessed by circular dichroism spectroscopy
Relative sensitivity of spectrin vs intact ghosts vs spectrin-depleted vesicles to microwave irradiation

Limitations

Exposure described as "high levels" (SAR 600 mW/g); generalizability to lower exposures not addressed in abstract
In vitro preparation (erythrocyte ghosts/proteins) rather than whole-organism outcomes
Duration of irradiation not reported in abstract
Sample size and statistical details not reported in abstract

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": 2450,
    "sar_wkg": 600,
    "duration": null
  },
  "population": "Human erythrocyte ghost proteins (including isolated spectrin)",
  "sample_size": null,
  "outcomes": [
    "Protein secondary structure (alpha-helical conformation) assessed by circular dichroism spectroscopy",
    "Relative sensitivity of spectrin vs intact ghosts vs spectrin-depleted vesicles to microwave irradiation"
  ],
  "main_findings": "Using circular dichroism spectroscopy, high-level 2450 MHz microwave irradiation (SAR 600 mW/g) was associated with decreases in alpha-helical conformation in erythrocyte ghost proteins. Isolated spectrin (bands 1 and 2) was reported to be more sensitive than intact ghosts, while spectrin-depleted vesicles were least sensitive, suggesting spectrin alpha-helical conformation is altered under these exposure conditions.",
  "effect_direction": "harm",
  "limitations": [
    "Exposure described as \"high levels\" (SAR 600 mW/g); generalizability to lower exposures not addressed in abstract",
    "In vitro preparation (erythrocyte ghosts/proteins) rather than whole-organism outcomes",
    "Duration of irradiation not reported in abstract",
    "Sample size and statistical details not reported in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "2450 MHz",
    "microwave radiation",
    "circular dichroism",
    "erythrocyte ghosts",
    "spectrin",
    "alpha-helix",
    "protein conformation",
    "specific absorption rate"
  ],
  "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: 10.1007/bf02785118
PubMed: 6175419

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