Biological effects of chronic exposure of Blaptica dubia (aka Dubia roach) nymphs to static and extremely low frequency magnetic fields

2021 · Harm · Low evidence

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HarmLow evidencePaper 1129

Chronic exposure (5 months) to a static magnetic field (110 mT) and an ELF magnetic field (10 mT, 50 Hz) significantly changed relative growth rate and decreased AChE activity in Blaptica dubia nymphs. Increased HSP70 levels were reported only after static ma…

Study snapshot

Publicationmanual · 2021

Study typeanimal

Reported directionHarm

Evidence ratingLow

Abstract

Biological effects of chronic exposure of Blaptica dubia (aka Dubia roach) nymphs to static and extremely low frequency magnetic fields Larisa Ilijin, Marija Mrdaković, Dajana Todorović, Milena Vlahović, Anja Grčić, Aleksandra Filipović, Vesna Perić- Mataruga. Biological effects of chronic exposure of Blaptica dubia (Blattodea: Blaberidae) nymphs to static and extremely low frequency magnetic fields. An Acad Bras Cienc. 2021 Jun 4;93(2):e20190118. doi: 10.1590/0001- 3765202120190118. Abstract In this paper, we analyzed the effects of chronic exposure (5 months) to static magnetic field (110 mT; SMF) and extremely low frequency magnetic field (ELF MF; 10 mT, 50 Hz) on Blaptica dubia nymphs. We have examined acetylcholinesterase (AChE) activity and heat shock protein 70 (HSP70) level, two sensitive biomarkers of stress in terrestrial insects. Relative growth rate (RGR), as a life history trait, was estimated. AChE activity was determined spectrophotometrically and HSP70 levels were quantified using indirect non-competitive ELISA and Western blotting. Calculated RGR was significantly changed upon exposure to both types of ambiental MFs. The effects of chronic exposure of B. dubia nymphs to SMF and ELF MF (50 Hz) were observed as decreased activity of AChE. The increased level of HSP70 was present only after exposure to SMF. The strength of ELF MF was most likely below the energy level needed to induce the expression of this stress protein. Different patterns of the expression of two HSP70 isoforms, where isoform 2 was sensitive only to SMF, are most likely a possibly switch - off in the expression of constitutive and/or inducible HSP70 isoforms. Open access paper: scielo.br

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 typeanimal

Effect directionharm

PopulationBlaptica dubia (Dubia roach) nymphs

Sample sizeNot supplied

ExposureELF · 5 months

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

Acetylcholinesterase (AChE) activity
Heat shock protein 70 (HSP70) level (including isoforms)
Relative growth rate (RGR)

Limitations

Sample size not reported in abstract
Details of exposure setup and controls not described in abstract
Outcomes limited to selected biomarkers and growth rate

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "5 months"
  },
  "population": "Blaptica dubia (Dubia roach) nymphs",
  "sample_size": null,
  "outcomes": [
    "Acetylcholinesterase (AChE) activity",
    "Heat shock protein 70 (HSP70) level (including isoforms)",
    "Relative growth rate (RGR)"
  ],
  "main_findings": "Chronic exposure (5 months) to a static magnetic field (110 mT) and an ELF magnetic field (10 mT, 50 Hz) significantly changed relative growth rate and decreased AChE activity in Blaptica dubia nymphs. Increased HSP70 levels were reported only after static magnetic field exposure, not after ELF exposure.",
  "effect_direction": "harm",
  "limitations": [
    "Sample size not reported in abstract",
    "Details of exposure setup and controls not described in abstract",
    "Outcomes limited to selected biomarkers and growth rate"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "Blaptica dubia",
    "Dubia roach",
    "nymphs",
    "static magnetic field",
    "SMF",
    "extremely low frequency magnetic field",
    "ELF MF",
    "50 Hz",
    "acetylcholinesterase",
    "AChE",
    "HSP70",
    "stress biomarkers",
    "relative growth rate"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.2,
      "reason": "Study involves chronic exposure to static and ELF magnetic fields, which can be relevant to occupational magnetic-field contexts, though no specific workplace source is described."
    }
  ]
}

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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: 10.1590/0001
PubMed: Not supplied

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