The effect of 2450 MHz microwave radiation on histamine secretion by rat peritoneal mast cells.

Cell biophysics · 1980 · Mixed · Low evidence

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MixedLow evidencePaper 6047

Study snapshot

PublicationCell biophysics · 1980

Study typein_vitro

Reported directionMixed

Evidence ratingLow

Abstract

Isolated rat peritoneal mast cells actively secrete histamine in response to reaginic or chemical stimulation. Mast cells were irradiated in a waveguide microwave exposure chamber at 2450 MHz with power absorptions of 8.2 and 41.0 mW/g for periods up to 3 h. These levels of microwave absorption caused no change in the morphological characteristics or viability of the cells. Irradiated mast cells were stimulated with compound 48/80, a potent, noncytotoxic histamine releasing agent. The dose response curves showed that neither prior nor simultaneous irradiation of mast cells at 37 degrees C affected 48/80-induced secretion. However, microwave power absorptions of 41.0 mW/g inhibited secretion at 44.0 degrees C. Precise measurements of the effect of heat on secretion indicated that this level of inhibition could have been produced by a radiation induced increase in cell temperature between 0.4 and 0.9 degrees C above ambient levels. Alternatively, the heat stress produced at 44 degrees C may have sensitized the cells to the electromagnetic effects of the microwave radiation. Rat peritoneal mast cells can therefore be useful as a model for the study of functioning secretory cells during microwave irradiation and can also be used to monitor the synergistic effects of cell heating during in vitro exposure.

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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 typein_vitro

Effect directionmixed

PopulationIsolated rat peritoneal mast cells

Sample sizeNot supplied

Exposuremicrowave · 2450 MHz · up to 3 h

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Mast cells exposed at 2450 MHz with power absorptions of 8.2 or 41.0 mW/g for up to 3 h showed no change in morphology or viability. At 37°C, neither prior nor simultaneous irradiation affected 48/80-induced histamine secretion, but at 44°C, 41.0 mW/g inhibited secretion; the inhibition could be explained by a radiation-induced temperature increase of ~0.4–0.9°C or by heat stress sensitizing cells to microwave effects.

Outcomes measured

Histamine secretion (compound 48/80-induced)
Cell morphology
Cell viability
Temperature-related inhibition at 44°C

Limitations

In vitro model (isolated rat peritoneal mast cells)
Sample size not reported in abstract
Inhibition observed only under elevated temperature condition (44°C), with potential thermal confounding

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": 2450,
    "sar_wkg": null,
    "duration": "up to 3 h"
  },
  "population": "Isolated rat peritoneal mast cells",
  "sample_size": null,
  "outcomes": [
    "Histamine secretion (compound 48/80-induced)",
    "Cell morphology",
    "Cell viability",
    "Temperature-related inhibition at 44°C"
  ],
  "main_findings": "Mast cells exposed at 2450 MHz with power absorptions of 8.2 or 41.0 mW/g for up to 3 h showed no change in morphology or viability. At 37°C, neither prior nor simultaneous irradiation affected 48/80-induced histamine secretion, but at 44°C, 41.0 mW/g inhibited secretion; the inhibition could be explained by a radiation-induced temperature increase of ~0.4–0.9°C or by heat stress sensitizing cells to microwave effects.",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro model (isolated rat peritoneal mast cells)",
    "Sample size not reported in abstract",
    "Inhibition observed only under elevated temperature condition (44°C), with potential thermal confounding"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "2450 MHz",
    "microwave radiation",
    "mast cells",
    "histamine secretion",
    "compound 48/80",
    "in vitro",
    "temperature",
    "thermal effects"
  ],
  "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/bf02795839
PubMed: 6159087

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