Phospho-ΔNp63α/microRNA feedback regulation in squamous carcinoma cells upon cisplatin exposure

Yiping Huang, Dafna Kesselman, Darya Kizub, Rafael Guerrero-Preston, Edward A. Ratovitski

Research output: Contribution to journalArticle

Abstract

Our previous reports showed that the cisplatin exposure induced the ATM-dependent phosphorylation of ΔNp63a, which is subsequently involved in transcriptional regulation of gene promoters encoding mRNAs and microRNAs in squamous cell carcinoma (SCC) cells upon cisplatin-induced cell death. We showed that phosphorylated (p)-ΔNp63a plays a role in upregulation of pro-apoptotic proteins, while non-p-ΔNp63a is implicated in pro-survival signaling. In contrast to non-p-ΔNp63a, p-ΔNp63a modulated expression of specific microRNAs in SCC cells exposed to cisplatin. These microRNAs were shown to attenuate the expression of several proteins involved in cell death/survival, suggesting the critical role for p-ΔNp63a in regulation of tumor cell resistance to cisplatin. Here, we studied the function of ΔNp63a in transcriptional activation and repression of the specific microRNA promoters whose expression is affected by cisplatin treatment of SCC cells. We quantitatively studied chromatin-associated proteins bound to tumor protein (TP) p63-responsive element, we found that p-ΔNp63a along with certain transcription coactivators (e.g., CARM1, KAT2B, TFAP2A, etc.) necessary to induce gene promoters for microRNAs (630 and 885-3p) or with transcription corepressors (e.g., EZH2, CTBP1, HDACs, etc.) needed to repress promoters for microRNAs (181a-5p, 374a-5p and 519a-3p) in SCC cells exposed to cisplatin.

Original languageEnglish (US)
Pages (from-to)684-697
Number of pages14
JournalCell cycle (Georgetown, Tex.)
Volume12
Issue number4
DOIs
StatePublished - Feb 15 2013

Fingerprint

MicroRNAs
Cisplatin
Squamous Cell Carcinoma
Cell Death
Co-Repressor Proteins
Apoptosis Regulatory Proteins
Proteins
Transcriptional Activation
Genes
Chromatin
Neoplasms
Cell Survival
Up-Regulation
Phosphorylation
Messenger RNA

Keywords

  • Cisplatin
  • DNA/protein interactions
  • MicroRNAs
  • P53
  • P63
  • Squamous cell carcinomas

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Cite this

Huang, Y., Kesselman, D., Kizub, D., Guerrero-Preston, R., & Ratovitski, E. A. (2013). Phospho-ΔNp63α/microRNA feedback regulation in squamous carcinoma cells upon cisplatin exposure. Cell cycle (Georgetown, Tex.), 12(4), 684-697. https://doi.org/10.4161/cc.23598

Phospho-ΔNp63α/microRNA feedback regulation in squamous carcinoma cells upon cisplatin exposure. / Huang, Yiping; Kesselman, Dafna; Kizub, Darya; Guerrero-Preston, Rafael; Ratovitski, Edward A.

In: Cell cycle (Georgetown, Tex.), Vol. 12, No. 4, 15.02.2013, p. 684-697.

Research output: Contribution to journalArticle

Huang, Y, Kesselman, D, Kizub, D, Guerrero-Preston, R & Ratovitski, EA 2013, 'Phospho-ΔNp63α/microRNA feedback regulation in squamous carcinoma cells upon cisplatin exposure', Cell cycle (Georgetown, Tex.), vol. 12, no. 4, pp. 684-697. https://doi.org/10.4161/cc.23598
Huang, Yiping ; Kesselman, Dafna ; Kizub, Darya ; Guerrero-Preston, Rafael ; Ratovitski, Edward A. / Phospho-ΔNp63α/microRNA feedback regulation in squamous carcinoma cells upon cisplatin exposure. In: Cell cycle (Georgetown, Tex.). 2013 ; Vol. 12, No. 4. pp. 684-697.
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