Electromagnetic fields instantaneously modulate nitric oxide signaling in challenged biological systems.

Biochemical and biophysical research communications · 2012 · Mixed · Low evidence

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MixedLow evidencePaper 4503

Study snapshot

PublicationBiochemical and biophysical research communications · 2012

Study typein_vitro

Reported directionMixed

Evidence ratingLow

Abstract

This study shows that a non-thermal pulse-modulated RF signal (PRF), configured to modulate calmodulin (CaM) activation via acceleration of Ca(2+) binding kinetics, produced an immediate nearly 3-fold increase in nitric oxide (NO) from dopaminergic MN9D cultures (P < 0.001). NO was measured electrochemically in real-time using a NO selective membrane electrode, which showed the PRF effect occurred within the first seconds after lipopolysaccharide (LPS) challenge. Further support that the site of action of PRF involves CaM is provided in human fibroblast cultures challenged with low serum and exposed for 15 min to the identical PRF signal. In this case a CaM antagonist W-7 could be added to the culture 3 h prior to PRF exposure. Those results showed the PRF signal produced nearly a two-fold increase in NO, which could be blocked by W-7 (P < 0.001). To the authors' knowledge this is the first report of a real-time effect of non-thermal electromagnetic fields (EMF) on NO release from challenged cells. The results provide mechanistic support for the many reported bioeffects of EMF in which NO plays a role. Thus, in a typical clinical application for acute post operative pain, or chronic pain from, e.g., osteoarthritis, EMF therapy could be employed to modulate the dynamics of NO via Ca/CaM-dependent constitutive nitric oxide synthase (cNOS) in the target tissue. This, in turn, would modulate the dynamics of the signaling pathways the body uses in response to the various phases of healing after physical or chemical insult or injury.

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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

PopulationCell cultures: dopaminergic MN9D cultures; human fibroblast cultures

Sample sizeNot supplied

ExposureRF · within first seconds after LPS challenge (MN9D cultures); 15 min (human fibroblast cultures)

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

A non-thermal pulse-modulated RF signal (PRF) produced an immediate nearly 3-fold increase in nitric oxide (NO) in dopaminergic MN9D cultures within the first seconds after lipopolysaccharide (LPS) challenge (P < 0.001). In human fibroblast cultures challenged with low serum and exposed for 15 minutes to the same PRF signal, NO increased nearly two-fold and this increase was blocked by the CaM antagonist W-7 (P < 0.001).

Outcomes measured

Nitric oxide (NO) release (real-time electrochemical measurement)
Calmodulin (CaM) involvement (blockade by W-7 antagonist)

Limitations

No RF exposure parameters reported (e.g., frequency, SAR, field strength).
In vitro cell culture models; generalizability to humans/clinical settings not established in the abstract.
Sample size and replication details not provided in the abstract.
Cells were challenged (LPS or low serum); effects may depend on challenged conditions rather than baseline physiology.

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "within first seconds after LPS challenge (MN9D cultures); 15 min (human fibroblast cultures)"
  },
  "population": "Cell cultures: dopaminergic MN9D cultures; human fibroblast cultures",
  "sample_size": null,
  "outcomes": [
    "Nitric oxide (NO) release (real-time electrochemical measurement)",
    "Calmodulin (CaM) involvement (blockade by W-7 antagonist)"
  ],
  "main_findings": "A non-thermal pulse-modulated RF signal (PRF) produced an immediate nearly 3-fold increase in nitric oxide (NO) in dopaminergic MN9D cultures within the first seconds after lipopolysaccharide (LPS) challenge (P < 0.001). In human fibroblast cultures challenged with low serum and exposed for 15 minutes to the same PRF signal, NO increased nearly two-fold and this increase was blocked by the CaM antagonist W-7 (P < 0.001).",
  "effect_direction": "mixed",
  "limitations": [
    "No RF exposure parameters reported (e.g., frequency, SAR, field strength).",
    "In vitro cell culture models; generalizability to humans/clinical settings not established in the abstract.",
    "Sample size and replication details not provided in the abstract.",
    "Cells were challenged (LPS or low serum); effects may depend on challenged conditions rather than baseline physiology."
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "radiofrequency",
    "non-thermal",
    "pulse-modulated",
    "PRF",
    "electromagnetic fields",
    "nitric oxide",
    "NO",
    "calmodulin",
    "CaM",
    "MN9D",
    "fibroblast",
    "lipopolysaccharide",
    "LPS",
    "W-7",
    "electrochemical real-time measurement"
  ],
  "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: 10.1016/j.bbrc.2012.08.078
PubMed: 22940137

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