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Lethal cellular changes induced by near ultraviolet radiation.

R M Tyrrell

    Acta Biologica Et Medica Germanica
    |January 1, 1979
    PubMed
    Summary
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    Near-ultraviolet (UV) radiation induces DNA damage and disrupts repair, potentially causing cell death. Specific wavelengths may fix lethal DNA lesions by inhibiting repair, especially in the presence of oxygen.

    Area of Science:

    • Molecular Biology
    • Photobiology
    • DNA Repair Mechanisms

    Background:

    • Near-ultraviolet (UV) radiation is known to induce significant DNA lesions.
    • These DNA lesions are susceptible to repair, but near-UV radiation can simultaneously disrupt DNA repair systems.
    • The interplay between DNA damage, repair inhibition, and cell death by near-UV radiation is complex.

    Purpose of the Study:

    • To investigate the link between specific DNA lesions induced by near-UV radiation and cell death.
    • To explore the role of oxygen-dependent repair disruption in 'fixing' lethal near-UV DNA lesions.
    • To correlate near-UV wavelength-specific sensitization to other cellular stresses with their efficiency in disrupting DNA repair.

    Main Methods:

    • Analysis of DNA lesions induced by various near-UV wavelengths.

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  • Assessment of DNA repair system disruption by near-UV radiation.
  • Investigation of oxygen-dependent effects on lesion fixation and cell lethality.
  • Examination of wavelength-specific sensitization to heat, chemicals, and radiation.

    • Main Results:

    • Near-UV radiation induces DNA lesions that can lead to cell death due to simultaneous repair system disruption.
    • A specific type of near-UV lesion may be rapidly fixed as a lethal event via oxygen-dependent repair inhibition.
    • The efficiency of near-UV wavelengths in disrupting DNA repair correlates with their ability to sensitize cells.

    Conclusions:

    • Near-UV radiation poses a dual threat by damaging DNA and impairing its repair, leading to cell death.
    • Oxygen-dependent mechanisms play a critical role in determining the lethal outcome of certain near-UV induced DNA lesions.
    • Further physico-chemical data are needed to fully support or refute the proposed model of near-UV radiation effects on DNA and repair.