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Identification of genes regulated by UV/salicylic acid
T Paunesku1, C M Chang-Liu, P Shearin-Jones
1Bioscience Division, Argonne National Laboratory, IL 60439, USA.
International Journal of Radiation Biology
|March 15, 2000
Summary
Salicylic acid modulates UV-induced gene expression, potentially via NF-kappaB. Researchers identified eight differentially expressed genes, four with NF-kappaB binding sites, suggesting a role in UV-induced apoptosis suppression.
Area of Science:
- Molecular Biology
- Cellular Stress Response
Background:
- UV irradiation significantly impacts cellular gene expression.
- Salicylic acid is known to modulate UV-induced gene expression changes.
- Nuclear factor-kappa B (NF-kappaB) is implicated as a key mediator in this modulation.
Purpose of the Study:
- To identify specific cDNAs differentially modulated by UV radiation.
- To investigate the role of salicylic acid in modulating UV-responsive gene expression.
- To explore the involvement of NF-kappaB in UV and salicylic acid interactions.
Main Methods:
- Differential-display reverse transcription polymerase chain reaction (RT-PCR) was employed.
- This technique allowed for the identification of genes with altered expression levels.
- Experiments compared gene expression in cells exposed to UV radiation with and without salicylic acid.
Main Results:
- Eight differentially expressed cDNAs were identified and characterized.
- Identified genes include lactate dehydrogenase (LDH-beta), NDUFV2, eIF4B, SP100, IF1, a yeast HAP5 homolog, and two ESTs (AA187906, AA513156).
- Four of the identified gene sequences contained NF-kappaB DNA binding sites.
Conclusions:
- The presence of NF-kappaB binding sites suggests a regulatory role for NF-kappaB in these genes.
- Down-regulation of these NF-kappaB-associated genes following UV irradiation may enhance cell survival.
- This mechanism could contribute to the suppression of p53-independent apoptosis, a critical cellular defense pathway.