Reduction of telomerase activity in human liver cancer cells by a histone deacetylase inhibitor

Mitsuyasu Nakamura, Hidetsugu Saito, Hirotoshi Ebinuma, Kanji Wakabayashi, Yoshimasa Saito, Tamako Takagi, Nobuhiro Nakamoto, Hiromasa Ishii

Research output: Contribution to journalArticle

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Abstract

The presence of telomerase has been demonstrated recently in many different malignancies. Several reports documented that in human hepatocellular carcinoma, the level of telomerase activity parallels its differentiation stage. In the present study, the effect of the differentiation-inducing agent sodium butyrate on telomerase activity in four human liver cancer cell lines was investigated using the telomeric repeat amplification protocol. We assayed telomerase activity before and after butyrate treatment and in cell cycle synchronized non-dividing quiescent cells. In addition, telomerase reverse transcriptase levels were measured at the mrna level. All four cell lines possessed high but not identical levels of telomerase activity. Telomerase activity was significantly reduced by treatment with sodium butyrate as well as trichostatin A in a dose- and time-dependent fashion, paralleling the reduction of cell proliferation. Although methotrexate, hydroxyurea, and colchicine synchronized the cell cycle at G1, S, and G2/m, respectively, and thereby also caused proliferating cells to cease dividing and become quiescent, in this case telomerase activity remained essentially unaltered compared to the control cultures. Moreover, levels of mrna encoding telomerase reverse transcriptase were not always significantly altered by either sodium butyrate treatment or cell cycle synchronization. These results suggest that sodium butyrate, as a histone deacetylase inhibitor, effectively reduces telomerase activity without affecting transcription levels of the reverse transcriptase component.

Original languageEnglish
Pages (from-to)392-401
Number of pages10
JournalJournal of Cellular Physiology
Volume187
Issue number3
DOIs
Publication statusPublished - 2001

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Histone Deacetylase Inhibitors
Telomerase
Liver Neoplasms
Human Activities
Liver
Cells
Butyric Acid
Cell Cycle
trichostatin A
Cell Line
Hydroxyurea
Butyrates
RNA-Directed DNA Polymerase
Colchicine
Cell proliferation
Transcription
Methotrexate
Amplification
Hepatocellular Carcinoma
Synchronization

ASJC Scopus subject areas

  • Clinical Biochemistry
  • Cell Biology
  • Physiology

Cite this

Reduction of telomerase activity in human liver cancer cells by a histone deacetylase inhibitor. / Nakamura, Mitsuyasu; Saito, Hidetsugu; Ebinuma, Hirotoshi; Wakabayashi, Kanji; Saito, Yoshimasa; Takagi, Tamako; Nakamoto, Nobuhiro; Ishii, Hiromasa.

In: Journal of Cellular Physiology, Vol. 187, No. 3, 2001, p. 392-401.

Research output: Contribution to journalArticle

Nakamura, Mitsuyasu ; Saito, Hidetsugu ; Ebinuma, Hirotoshi ; Wakabayashi, Kanji ; Saito, Yoshimasa ; Takagi, Tamako ; Nakamoto, Nobuhiro ; Ishii, Hiromasa. / Reduction of telomerase activity in human liver cancer cells by a histone deacetylase inhibitor. In: Journal of Cellular Physiology. 2001 ; Vol. 187, No. 3. pp. 392-401.
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