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Related Experiment Videos

Time-varying magnetic fields: effect on DNA synthesis.

A R Liboff, T Williams, D M Strong

    Science (New York, N.Y.)
    |February 24, 1984
    PubMed
    Summary

    Sinusoidally varying magnetic fields enhance DNA synthesis in human fibroblasts. This finding questions therapeutic device efficacy and suggests potential mutagenic risks from geomagnetic field fluctuations.

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    Area of Science:

    • Cell Biology
    • Biophysics
    • Electromagnetism

    Background:

    • Human fibroblasts exhibit DNA synthesis crucial for cell replication and tissue repair.
    • Magnetic fields are utilized in therapeutic devices, such as those for bone nonunion.
    • The biological effects of magnetic fields, particularly their interaction with cellular processes, are not fully understood.

    Purpose of the Study:

    • To investigate the effect of sinusoidally varying magnetic fields on DNA synthesis in human fibroblasts.
    • To determine the range of frequencies and amplitudes that influence DNA synthesis.
    • To explore the underlying mechanism and compare findings with existing therapeutic applications.

    Main Methods:

    • Human fibroblasts were exposed to sinusoidally varying magnetic fields.
    • A wide range of frequencies (15 Hz to 4 kHz) and amplitudes (2.3 x 10(-6) to 5.6 x 10(-4) T) were tested.
    • DNA synthesis levels were measured to assess the impact of magnetic field exposure.

    Main Results:

    • Enhanced DNA synthesis was observed in human fibroblasts across a broad spectrum of magnetic field frequencies and amplitudes.
    • The effect peaked during the S phase of the cell cycle.
    • The observed enhancement appeared independent of the magnetic field's time derivative, suggesting a mechanism beyond Faraday's law.

    Conclusions:

    • Sinusoidal magnetic fields can significantly influence human fibroblast DNA synthesis.
    • Current therapeutic devices using specific magnetic wave shapes for bone nonunion may need re-evaluation.
    • The study highlights potential mutagenic risks associated with short-term fluctuations in the Earth's geomagnetic field.

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