Interaction of Heterogeneous Nuclear Ribonucleoprotein C1/C2 with a Novel cis-Regulatory Element within p53 mRNA as a Response to Cytostatic Drug Treatment
Copyright policy )Interaction of Heterogeneous Nuclear Ribonucleoprotein C1/C2 with a Novel cis-Regulatory Element within p53 mRNA as a Response to Cytostatic Drug Treatment
We describe a novel cis-element in the 5' coding region of p53 mRNA and its interaction with heterogeneous nuclear ribonucleoprotein (hnRNP)C1/C2. This element is located in a putative hairpin loop structure, within the first 101 nucleotides downstream of the start codon. The binding of hnRNPC1/C2 is strongly enhanced in response to the DNA-damaging drug cisplatin [cis-diamminedichloroplatinum(II)] and the cytostatic transcriptional inhibitor actinomycin D (dactinomycin), both known inducers of apoptosis and p53. Strongly stimulated binding is observed in both nuclear and cytoplasmic compartments, and it is accompanied by a cytoplasmic increase of hnRNPC1/C2. Changes in hnRNPC1/C2 protein levels are not proportional to binding activity, suggesting qualitative changes in hnRNPC1/C2 upon activation. Phosphorylation studies reveal contrasting characteristics of the cytoplasmic and nuclear hnRNPC1/C2 interaction with p53 mRNA. Results from chimeric p53-luciferase reporter constructs suggest that hnRNPC1/C2 regulates p53 expression via this binding site. Our results are consistent with a mechanism in which the interaction of hnRNPC1/C2 with a cis-element within the coding region of the p53 transcript regulates the expression of p53 mRNA before and during apoptosis. In addition, we report that preapoptotic signals induced by transcriptional inhibition trigger the appearance of a truncated, exclusively cytoplasmic 43-kDa variant of p53 before apoptosis.
- University of Queensland Australia
- Uppsala University Sweden
- University of Queensland Australia
Cytoplasm, 572, Molecular Sequence Data, Tumor-suppressor, Down-Regulation, Apoptosis, Polymerase-ii, HNRNP-C, Cell Line, Dna-damage, Open Reading Frames, Humans, Binding proteins, Amino Acid Sequence, Dependent mannaer, Codon, Luciferases, 11 Medical and Health Sciences, Mediated translation, Cell Nucleus, Binding Sites, Base Sequence, Heterogeneous-Nuclear Ribonucleoprotein Group C, Cytostatic Agents, Entry site, Molecular Weight, Actinomycin-d, Organ Specificity, Mutation, Dactinomycin, Nucleic Acid Conformation, Cisplatin
Cytoplasm, 572, Molecular Sequence Data, Tumor-suppressor, Down-Regulation, Apoptosis, Polymerase-ii, HNRNP-C, Cell Line, Dna-damage, Open Reading Frames, Humans, Binding proteins, Amino Acid Sequence, Dependent mannaer, Codon, Luciferases, 11 Medical and Health Sciences, Mediated translation, Cell Nucleus, Binding Sites, Base Sequence, Heterogeneous-Nuclear Ribonucleoprotein Group C, Cytostatic Agents, Entry site, Molecular Weight, Actinomycin-d, Organ Specificity, Mutation, Dactinomycin, Nucleic Acid Conformation, Cisplatin
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).52 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 10% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Top 10% impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 10%
Citations provided by BIP!Popularity provided by BIP!