Levels of expression of hRPB11, a core subassembly subunit of human RNA polymerase II, affect doxorubicin sensitivity and cellular differentiation

Tiziana Bruno, Carlo Leonetti, Simona Aloe, Carla Iacobini, Aristide Floridi, Ugo Di Tondo, Antonello Punturieri, Maurizio Fanciulli

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We have previously shown that the human RNA polymerase II subunit 11 (hRPB11) is among the proteins specifically downregulated upon Doxorubicin (Dox) treatment of human cancer cell lines, and that Dox resistant clones derived upon drug selection express about 20% of the protein present in the original parental cell line. Given the prominent role that this subunit appears to have in eukaryotic cells, and the fact that its deletion causes lethality in yeast, we wanted to test the effect of the reintroduction of parental cell line levels of this subunit in Dox resistant colon cancer cells (LoVoDX). Stable transfectants of LoVoDX expressing parental (LoVoH) levels of hRPB11 showed a reduced sensitivity to the drug without changing the response of these cells to other chemotherapeutic agents, confirming a specific inverse correlation between cellular Dox sensitivity anti-hRPB11 levels of expression. In addition we show here that the levels of expression of this same RNA polymerase II subunit directly affect cellular differentiation, reducing the rate of cell proliferation, clonogenicity and increasing the expression of E-cadherin, a marker of epithelial cell differentiation. As expected from cells with these characteristics, upon in vivo administration of these clones in nude mice, we detected a significant reduction in the size and time of appearance of the primary tumors and overall metastatic capability. Finally, the role played by hRPB11 in regulating the transcription of specific genes is underlined by transient transfection experiments that show transactivation of the E-cadherin promoter by this protein.

Original languageEnglish
Pages (from-to)241-246
Number of pages6
JournalFEBS Letters
Volume427
Issue number2
DOIs
Publication statusPublished - May 8 1998

Fingerprint

RNA Polymerase II
Doxorubicin
Cells
Cadherins
Cell Line
Clone Cells
Proteins
Cell proliferation
Eukaryotic Cells
Transcription
Nude Mice
Pharmaceutical Preparations
Yeast
Colonic Neoplasms
Transcriptional Activation
Transfection
Tumors
Cell Differentiation
Neoplasms
Down-Regulation

Keywords

  • Cell differentiation
  • Doxorubicin
  • Drug toxicity
  • RNA polymerase II

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

Levels of expression of hRPB11, a core subassembly subunit of human RNA polymerase II, affect doxorubicin sensitivity and cellular differentiation. / Bruno, Tiziana; Leonetti, Carlo; Aloe, Simona; Iacobini, Carla; Floridi, Aristide; Di Tondo, Ugo; Punturieri, Antonello; Fanciulli, Maurizio.

In: FEBS Letters, Vol. 427, No. 2, 08.05.1998, p. 241-246.

Research output: Contribution to journalArticle

Bruno, Tiziana ; Leonetti, Carlo ; Aloe, Simona ; Iacobini, Carla ; Floridi, Aristide ; Di Tondo, Ugo ; Punturieri, Antonello ; Fanciulli, Maurizio. / Levels of expression of hRPB11, a core subassembly subunit of human RNA polymerase II, affect doxorubicin sensitivity and cellular differentiation. In: FEBS Letters. 1998 ; Vol. 427, No. 2. pp. 241-246.
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