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Changes in nuclear protein acetylation in u.v.-damaged human cells.
Carcinogenesis
|July 1, 1986
Summary
UV radiation causes immediate hyperacetylation of nuclear proteins in human cells, followed by hypoacetylation. This acetylation pattern, particularly in histones, may be linked to DNA repair processes.
Area of Science:
- Molecular Biology
- Cellular Biology
- Biochemistry
Background:
- Nuclear protein acetylation plays a role in regulating gene expression and DNA repair.
- UV irradiation induces DNA damage, triggering cellular responses.
Purpose of the Study:
- To investigate the dynamic changes in nuclear protein acetylation following UV irradiation in human fibroblasts.
- To determine if these acetylation changes correlate with DNA repair mechanisms.
Main Methods:
- Human fibroblasts were exposed to varying doses of UV radiation.
- Acid-soluble nuclear proteins were extracted and analyzed for acetylation levels.
- Individual protein acetylation was examined, focusing on histones and non-histone proteins.
Main Results:
- UV irradiation induced a biphasic acetylation response: an initial hyperacetylation (2-6 hours) followed by hypoacetylation (lasting hours to days).
- Acetylation patterns varied with UV dose and were prolonged by hydroxyurea, an excision repair inhibitor.
- Core histones exhibited the biphasic acetylation, while histone H1 showed negligible changes. Certain non-histone proteins showed delayed hyperacetylation.
Conclusions:
- Nuclear protein acetylation, particularly of core histones, dynamically responds to UV-induced DNA damage.
- The observed acetylation patterns suggest a potential causal link between protein acetylation and nucleotide excision repair in human cells.