Reprogramming of replicative senescence in hepatocellular carcinoma-derived cells

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Ozturk N., Erdal E., Mumcuoglu M., AKÇALI K. C., Yalcin O., ŞENTÜRK Ş., ...Daha Fazla

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, cilt.103, sa.7, ss.2178-2183, 2006 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 103 Sayı: 7
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1073/pnas.0510877103
  • Dergi Adı: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2178-2183
  • Anahtar Kelimeler: immortality, liver cancer, SIP1, telomerase, p53, DNA-BINDING, TELOMERASE, GENE, SIP1, EXPRESSION, PATHWAYS, GROWTH, LINES
  • Ankara Üniversitesi Adresli: Hayır

Özet

Tumor cells have the capacity to proliferate indefinitely that is qualified as replicative immortality. This ability contrasts with the intrinsic control of the number of cell divisions in human somatic tissues by a mechanism called replicative senescence. Replicative immortality is acquired by inactivation of p53 and p16(INK4a) genes and reactivation of hTERT gene expression. It is unknown whether the cancer cell replicative immortality is reversible. Here, we show the spontaneous induction of replicative senescence in p53-and p16(INK4a)-deficient hepatocellular carcinoma cells. This phenomenon is characterized with hTERT repression, telomere shortening, senescence arrest, and tumor suppression. SIP1 gene (ZFHX1B) is partly responsible for replicative senescence, because short hairpin RNA-mediated SIP1 inactivation released hTERT repression and rescued clonal hepatocellular carcinoma cells from senescence arrest.