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UV-B Irradiated Cell Lines Execute Programmed Cell Death in Various Forms

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Abstract

We investigated changes typical for apoptosis in various cell lines after UV-B irradiation. Using established methods for detection of apoptosis we demonstrate changes of cellular morphology, phosphatidylserine (PS) exposure, ollgonucleosomal DNA fragmentation and generation of hypochrome nuclei. To isolated high-molecular-weight (hmwt) DNA fragments we engaged a new method avoiding pulse field gel electrophoresis. Most UV-B irradiated cell lines showed oligonucleosomal DNA fragmentation, hypochrome nuclei, morphological changes, annexin-V binding and positive TUNEL reaction. However, no oligonucleosomal DNA fragmentation could be detected in Raji and HaCaT cells. Whereas HaCaT cells displayed all other changes typical for apoptosis, Raji cells were TUNEL negative, formed low amounts of hmwt DNA and showed an 'atypically' low hypochrome shift. Nevertheless, UV-B irradiated Raji cells excluded propidium iodide (PI), bound annexin-V and stopped proliferation. This suggests that Raji cells underwent growth arrest with exposure of PS being the only feature of apoptosis. However, in the presence of phagocytes expressing the phosphatidylserine receptor these cells would share the removal pathway with apoptotic cells. Since UV-B induced programmed cell death differs in dependence of cells under investigation, the failure to detect oligonucleosomal DNA fragmentation or chromatin condensation is not suitable to exclude programmed (apoptotic?) cell death.

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Authors and Affiliations

  1. Institute of Clinical Immunology and Rheumatology, Department of Medicine III, Friedrich-Alexander-University, Erlangen-Nürnberg, Germany

    M. Hagenhofer, P. Rohwer, J. R. Kalden & M. Herrmann

  2. GSF-National Research Centre for Environment and Health, Institute of Molecular Virology, Neuherberg, Germany

    H. Germaier & C. Hohenadl

  3. Department of Dermatology, Ludwig-Maximilians University München, München, Germany

    H. Germaier

  4. Medical Clinic III, Faculty of Clinical Medicine Mannheim, University of Heidelberg, Mannheim, Germany

    C. Hohenadl

Authors
  1. M. Hagenhofer
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  2. H. Germaier
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  3. C. Hohenadl
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  4. P. Rohwer
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  5. J. R. Kalden
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  6. M. Herrmann
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Hagenhofer, M., Germaier, H., Hohenadl, C. et al. UV-B Irradiated Cell Lines Execute Programmed Cell Death in Various Forms. Apoptosis 3, 123–132 (1998). https://doi.org/10.1023/A:1009601109509

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