Details

Autor(en) / Beteiligte

• Ozturk, Nuri
• Erdal, Esra
• Mumcuoglu, Mine
• Akcali, Kamil C.
• Yalcin, Ozden
• Senturk, Serif
• Arslan-Ergul, Ayca
• Gur, Bala
• Yulug, Isik
• Cetin-Atalay, Rengul
• Yakicier, Cengiz
• Yagci, Tamer
• Tez, Mesut
• Ozturk, Mehmet

Titel

Reprogramming of Replicative Senescence in Hepatocellular Carcinoma-Derived Cells

Ist Teil von

• Proceedings of the National Academy of Sciences - PNAS, 2006-02, Vol.103 (7), p.2178-2183

Ort / Verlag

United States: National Academy of Sciences

Erscheinungsjahr

2006

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• 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.