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Related Experiment Videos

Blockade of telomerase function in various cells.

Y E Yegorov1, S S Akimov, A K Akhmalisheva

  • 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, Russia. yegorov@genome.eimb.relarn.ru

Anti-Cancer Drug Design
|January 8, 2000
PubMed
Summary

Reverse transcriptase inhibitors (RTI) block telomerase, inducing cellular senescence or crisis. Some cells overcome this blockade, developing resistance to RTI by reactivating telomerase.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Pharmacology

Background:

  • Telomerase is a key enzyme in cellular immortalization and cancer.
  • Reverse transcriptase inhibitors (RTIs) are known to affect cellular processes.

Purpose of the Study:

  • To investigate the effects of RTIs on telomerase function and cellular fate.
  • To determine how different cell types respond to telomerase inhibition.

Main Methods:

  • Treatment of various cell lines (fibroblasts, myoblasts, tumor cells) with RTIs (azidothymidine, carbovir).
  • Analysis of telomere length, senescence markers, differentiation, and cell proliferation.
  • Assessment of telomerase activity and resistance mechanisms.

Main Results:

Related Experiment Videos

  • RTIs like azidothymidine and carbovir inhibit telomerase, inducing senescence in fibroblasts and myoblasts, sometimes with altered differentiation.
  • In human tumor cells, RTI treatment shortens telomeres, leading to crisis rather than senescence, with subsequent proliferation of resistant cells.
  • RTIs prevent spontaneous telomerase reactivation in mouse embryonic fibroblasts, but some clones acquire telomerase activity and become resistant.

Conclusions:

  • Telomerase blockade by RTIs can trigger diverse cellular responses including senescence, partial differentiation, or crisis, depending on the cell type.
  • Human tumor cells primarily undergo crisis upon telomerase inhibition, with a subset developing resistance through telomerase reactivation.