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DNA damage production in CHO cells at elevated temperatures.

R L Warters, L M Brizgys, J Axtell-Bartlett

    Journal of Cellular Physiology
    |September 1, 1985
    PubMed
    Summary

    Hyperthermic temperatures above 45°C induce DNA lesions in Chinese hamster ovary (CHO) cells, potentially by denaturing nuclear polypeptides. This DNA damage occurs with high thermal activation energy.

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    Area of Science:

    • Cellular biology
    • Molecular biology
    • Biophysics

    Background:

    • Hyperthermia, or elevated body temperature, is a known stressor for cells.
    • Understanding the molecular mechanisms of heat-induced cellular damage is crucial for various applications, including cancer therapy.

    Purpose of the Study:

    • To investigate the induction of DNA lesions in Chinese hamster ovary (CHO) cells at hyperthermic temperatures.
    • To elucidate the biophysical and molecular characteristics of heat-induced DNA damage.

    Main Methods:

    • Alkaline filter elution technique to detect DNA strand breaks.
    • Alkaline sucrose gradient sedimentation to assess DNA size and integrity.
    • Analysis of thermal activation energy for DNA lesion induction.

    Main Results:

    • DNA lesions were induced in CHO cells at temperatures exceeding 45°C.
    • A high thermal activation energy of 140 kcal/mole was calculated for lesion induction.
    • The cell genome was reduced to a 140 S (2 x 10^8 dalton) DNA subunit, irrespective of exposure time above 45°C.

    Conclusions:

    • The findings suggest that hyperthermia induces significant DNA damage in mammalian cells.
    • The high activation energy and limited DNA fragmentation point towards the thermal denaturation of nuclear polypeptides as a key mechanism.
    • This study provides insights into the molecular basis of thermal stress responses in cells.

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