Telomerase activity in HeLa cervical carcinoma cell line proliferation (CROSBI ID 141212)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Ivanković, Milena ; Ćukušić, Andrea ; Gotić, Ivana ; Škrobot, Nikolina ; Matijašić, Mario ; Polančec, Denis ; Rubelj, Ivica
engleski
Telomerase activity in HeLa cervical carcinoma cell line proliferation
Normal human somatic cells in culture have a limited dividing potential. This is due to DNA end replication problem, whereby telo- meres shorten with each subsequent cell division. When a critical telomere length is reached cells enter senescence. To overcome this problem, immortal HeLa cell line express telomerase, an enzyme that prevents telomere shortening. Although immortal, the existence of non-dividing cells that do not incorporate 3H-thymidine over 24 h of growth has been well documented in this cell line. Using DiI labeling and high-speed cell sorting, we have separated and analyzed fractions of HeLa cells that divided vigorously as well as those that cease divisions over several days in culture. We also analyzed telomerase activity in separated fractions and surprisingly, found that the fraction of cells that divided 0– 1 time over 6 days in culture have several times higher endogenous telomerase activity than the fastestdividing fraction. Additionally, the non-growingfraction regains an overall high labeling index and low SA-b-Gal activity when subcultured again. This phenomenon should be considered if telo- merase inhibition is to be used as an approach to cancer therapy. In this paper we also discuss possible molecular mechanisms that underlie the observed results
DiI ; Flow cytometry ; HeLa ; Senescence ; Telomerase
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Podaci o izdanju
8 (2)
2007.
163-172
objavljeno
1389-5729
1573-6768
10.1007/s10522-006-9043-9