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Molecular mechanisms involved in UV-induced apoptotic cell death
1Ludwig Boltzmann Institute for Cell Biology and Immunobiology of the Skin, Department of Dermatology, University Münster, Münster, Germany.
Abstract:
Ultraviolet radiation (UV) induces a variety of biological effects which include the induction of programmed cell death. UV-induced apoptosis seems to represent a controlled scavenging mechanism which protects cells from malignant transformation in human skin. To exert these effects on a cellular base, UV uses a variety of signaling pathways, involving nuclear DNA damage as a predominant pathway, since experimental reduction of DNA damage is associated with a loss of these effects. On the other hand, UV has been found to utilize extranuclear components located in the cytoplasm or at the cell membrane for signaling. UV can directly activate cell surface death receptors, thereby triggering the apoptotic machinery. Oxidative stress accompanied by mitochondrial changes and cytochrome c release are further involved in UV-mediated apoptosis. The following review will briefly discuss current aspects of the interplay between the different signaling pathways involved in UV-induced apoptosis.
Insights
Ultraviolet radiation (UV) triggers programmed cell death (apoptosis) in skin cells. This process, involving DNA damage and extranuclear signaling, helps prevent skin cancer.
Area of Science:
- Molecular Biology
- Dermatology
- Cell Biology
Background:
- Ultraviolet radiation (UV) is a known inducer of biological effects, including programmed cell death.
- UV-induced apoptosis in human skin cells acts as a protective mechanism against malignant transformation.
- Cellular responses to UV involve complex signaling pathways, both nuclear and extranuclear.
Purpose of the Study:
- To review the signaling pathways involved in UV-induced apoptosis.
- To discuss the interplay between nuclear and extranuclear signaling in UV-mediated cell death.
- To highlight the protective role of UV-induced apoptosis in preventing skin cancer.
Main Methods:
- Review of existing literature on UV radiation and apoptosis.
- Analysis of signaling pathways initiated by UV exposure.
- Examination of the role of DNA damage and extranuclear components in apoptosis.
Main Results:
- UV radiation induces apoptosis through multiple pathways, including nuclear DNA damage.
- Extranuclear signaling, involving cell surface receptors and mitochondria, also contributes to UV-induced apoptosis.
- Oxidative stress, mitochondrial dysfunction, and cytochrome c release are key events in this process.
Conclusions:
- UV-induced apoptosis is a critical defense mechanism in human skin.
- Understanding the interplay of various signaling pathways is crucial for comprehending UV's biological effects.
- This protective cell death pathway plays a significant role in preventing UV-induced carcinogenesis.