Digression on chemical electromagnetic field effects in membrane signal transduction--cooperativity paradigm of the acetylcholine receptor.
← Research streamThe article argues that equilibrium and rate constants are only sensitive to external fields when reaction moments (ΔM) are finite, and that small local EMF-induced shifts in K and k would require amplification to become effective. It proposes structural/func…
Study snapshot
Abstract
There is ongoing public concern on potential hazards and risks of even small electromagnetic fields (EMFs) such as those emanating from electrical appliances. Evolution and persistence of life in the natural geofields and basic scientific experience in using technical EMFs (F) suggest that, in general, living matter is remarkably stable against external field perturbations within the technical safety limits of the EM field strengths. Besides the trivial primary effects of EMF on ionic charges and dipolar matter, it is explicitly elaborated that cellular biochemical reactivity and channel transport processes are field dependent. However, equilibrium (K) and rate (k) constants are only sensitive to F if the reaction moments deltaM are finite, as seen in the general van't Hoff relationship d ln K/dF = deltaM/RT. Indeed, it is the difference (deltaM) in the electric or magnetic moments (M), representing the difference in the field forces on the reaction partners, that determines the extent of the field-induced transitions, say from an inactive conformer of a macromolecule to an active one. If small EM fields, which locally can only cause small shifts in K and k, are to become effective for chemical reactivity, amplification is required. A widely encountered concept of chemical amplification is structural, and thus functional, cooperativity, realized in many biopolymers. The cooperation of n units of such a polymer yields a larger deltaM(n)= ndeltaM and exponentially increases the field sensitivity of the overall equilibrium constant K(n) = Kn. Using the acetylcholine receptor protein as an example for signal amplification by structural cooperativity, explicit proposals are specified for the presumed amplification of small local field effects on proteins of the classical signal transduction cascades. Electric membrane field amplification by interfacial polarization in external fields is discussed in the context of using electric field pulses to transiently permeabilize cells and tissue for the direct transfer of effector substances and genes in cancer and gene therapy.
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.
Main findings
The article argues that equilibrium and rate constants are only sensitive to external fields when reaction moments (ΔM) are finite, and that small local EMF-induced shifts in K and k would require amplification to become effective. It proposes structural/functional cooperativity (illustrated with the acetylcholine receptor) as a mechanism that could amplify small field effects on proteins involved in signal transduction, and discusses membrane field amplification and electric field pulses for transient permeabilization.
Outcomes measured
- biochemical reactivity and channel transport field dependence (theoretical)
- effects of small EMFs on equilibrium (K) and rate (k) constants via reaction moments (ΔM)
- signal amplification via structural/functional cooperativity (acetylcholine receptor example)
- membrane field amplification and electroporation-related permeabilization for substance/gene transfer
Limitations
- Appears to be a conceptual/theoretical discussion rather than reporting new empirical health outcome data
- No specific EMF exposure parameters (frequency, intensity, duration) are provided in the abstract
- No population, sample size, or quantitative effect estimates are described
View raw extracted JSON
{
"study_type": "review",
"exposure": {
"band": null,
"source": "electrical appliances (general)",
"frequency_mhz": null,
"sar_wkg": null,
"duration": null
},
"population": null,
"sample_size": null,
"outcomes": [
"biochemical reactivity and channel transport field dependence (theoretical)",
"effects of small EMFs on equilibrium (K) and rate (k) constants via reaction moments (ΔM)",
"signal amplification via structural/functional cooperativity (acetylcholine receptor example)",
"membrane field amplification and electroporation-related permeabilization for substance/gene transfer"
],
"main_findings": "The article argues that equilibrium and rate constants are only sensitive to external fields when reaction moments (ΔM) are finite, and that small local EMF-induced shifts in K and k would require amplification to become effective. It proposes structural/functional cooperativity (illustrated with the acetylcholine receptor) as a mechanism that could amplify small field effects on proteins involved in signal transduction, and discusses membrane field amplification and electric field pulses for transient permeabilization.",
"effect_direction": "unclear",
"limitations": [
"Appears to be a conceptual/theoretical discussion rather than reporting new empirical health outcome data",
"No specific EMF exposure parameters (frequency, intensity, duration) are provided in the abstract",
"No population, sample size, or quantitative effect estimates are described"
],
"evidence_strength": "insufficient",
"confidence": 0.74,
"peer_reviewed_likely": "yes",
"keywords": [
"electromagnetic fields",
"membrane signal transduction",
"acetylcholine receptor",
"cooperativity",
"reaction moments",
"equilibrium constant",
"rate constant",
"interfacial polarization",
"electroporation",
"gene therapy",
"cancer therapy"
],
"suggested_hubs": []
}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/s0302-4598(00)00082-9
PubMed: 11059576