Blockade of telomerase function in various cells

Yegor E. Yegorov, Sergei S. Akimov, Aliya K. Akhmalisheva, Irina V. Semenova, Yuliya B. Smirnova, Alexander A. Kraevsky, Alexander V. Zelenin

Research output: Contribution to journalArticlepeer-review


The reverse transcriptase inhibitors (RTI) azidothymidine and carbovir can block telomerase function in various cells, whereas dideoxycytidine does not exhibit such activity. RTI induce senescence in 3T3 Swiss, NIH 3T3 cell cultures and in the clones of immortal spontaneously transformed mouse fibroblasts. The RTI-induced senescence of L6 rat myoblasts in culture resembles the senescence of fibroblasts, but the resulting cells acquire sharp morphological peculiarities. The artificial senescence of fibroblasts and myoblasts resulted in both the appearance of corresponding senescent cells and a small portion of cells with the signs of another type of differentiation. The blockade of telomerase function by RTI in the human tumour cell lines U-937 and MeWo leads to the shortening of telomeres, but does not result in senescence. These cells may undergo crisis and after a while the proliferation resumes and resistant cells appear. RTI inhibit spontaneous reactivation of telomerase in the process of spontaneous transformation of mouse embryonic fibroblasts, which leads to the formation of telomerase-free clones. A fraction of these clones may overcome the senescence via the acquisition of telomerase activity. Cells with a very high level of telomerase activity become resistant to RTI. Thus, the blockade of telomerase function in different cells can induce senescence, partial differentiation or crisis, in human tumour cells it induces mainly crisis.

Original languageEnglish (US)
Pages (from-to)305-316
Number of pages12
JournalAnti-Cancer Drug Design
Issue number4
StatePublished - Aug 1 1999
Externally publishedYes


  • Cancer
  • Crisis
  • Differentiation
  • Reverse transcriptase
  • Senescence
  • Spontaneous transformation
  • Telomerase inhibitors
  • Telomeres

ASJC Scopus subject areas

  • Biochemistry
  • Oncology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology
  • Drug Discovery
  • Organic Chemistry


Dive into the research topics of 'Blockade of telomerase function in various cells'. Together they form a unique fingerprint.

Cite this