Title : p53 activation by Cr(VI): a transcriptionally limited response induced by ATR kinase in S-phase.

Pub. Date : 2019 Aug 6

PMID : 31388677






4 Functional Relationships(s)
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1 We examined Cr(VI) effects on the p53 pathway in human cells with restored levels of ascorbate that acts as a principal reducer of Cr(VI) in vivo but is nearly absent in standard cell cultures. Ascorbic Acid tumor protein p53 Homo sapiens
2 Ascorbate-restored H460 and primary human cells treated with Cr(VI) contained higher levels of p53 and its Ser15 phosphorylation, which were induced by ATR kinase. Ascorbic Acid tumor protein p53 Homo sapiens
3 A weak transcription activity of Cr(VI)-upregulated p53 was associated with its low lysine acetylation in the regulatory C-terminal domain, resulting from the inability of Cr(VI) to activate ATM in ascorbate-restored cells. Ascorbic Acid tumor protein p53 Homo sapiens
4 Thus, p53 activation by ascorbate-metabolized Cr(VI) represents a limited genome-protective response that is defective in upregulation of DNA repair genes and proapoptotic transcripts for elimination of damaged cells. Ascorbic Acid tumor protein p53 Homo sapiens