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UV-induced signal transduction

K Bender1, C Blattner, A Knebel

  • 1Forschungzentrum Karlsruhe, Institut für Genetik, Germany.

Journal of Photochemistry and Photobiology. B, Biology
|January 1, 1997
PubMed
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Ultraviolet (UV) radiation triggers gene transcription in cells, initiating rapid responses via protein kinases and later responses dependent on DNA damage. This complex signaling network dictates the cell's ultimate fate after UV exposure.

Area of Science:

  • Cellular biology
  • Molecular biology
  • Genetics

Background:

  • Ultraviolet (UV) radiation, encompassing UVA, B, and C wavelengths, is a potent environmental stressor that significantly impacts cellular processes.
  • UV-induced cellular responses involve complex transcriptional programs that overlap with those triggered by oxidants and alkylating agents, suggesting shared signaling pathways.
  • Understanding these responses is crucial for comprehending cellular protection mechanisms and the broader implications of UV exposure.

Purpose of the Study:

  • To elucidate the temporal dynamics and molecular mechanisms underlying gene transcription induced by UV irradiation.
  • To investigate the role of protein kinases and growth factor signaling pathways in the immediate and delayed cellular responses to UV.
  • To differentiate the contributions of direct signaling events versus DNA damage in orchestrating the UV-induced genetic program.

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Main Methods:

  • Analysis of gene transcription patterns following UV irradiation across different time points.
  • Investigation of protein kinase activation and growth factor receptor phosphorylation using biochemical assays.
  • Assessment of the dependence of cellular responses on DNA damage in specific genomic regions.

Main Results:

  • UV irradiation rapidly induces transcription of immediate-response genes, including those for transcription factors, mediated by proline-directed protein kinases activated via growth factor-like pathways.
  • Early cellular events include tyrosine phosphorylation of growth factor receptors, independent of DNA damage, resulting from tyrosine phosphatase inhibition.
  • Late cellular responses to UV are critically dependent on DNA damage within transcribed genomic regions.
  • UV absorption by multiple cellular targets stimulates diverse signal transduction pathways, collectively defining the cell's fate.

Conclusions:

  • UV-induced cellular responses are multifaceted, involving both rapid, DNA-damage-independent signaling and slower, DNA-damage-dependent transcriptional programs.
  • Protein kinases and growth factor signaling pathways play pivotal roles in mediating the immediate cellular reactions to UV exposure.
  • The intricate interplay of stimulated signal transduction pathways ultimately determines the genetic program and fate of UV-irradiated cells.