Induction of Apoptotic Endonuclease EndoG with DNA-Damaging Agents Initiates Alternative Splicing of Telomerase Catalytic Subunit hTERT and Inhibition of Telomerase Activity hTERT in Human CD4+ and CD8+ Т Lymphocytes


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Abstract

Activity of the telomerase catalytic subunit hTERT (human Telomerase Reverse Transcriptase) can be regulated by alternative splicing of its mRNA. At the present time, the exact mechanism of hTERT splicing is not fully understood. Apoptotic endonuclease EndoG is known to participate this process. EndoG expression is induced by DNA damages. The aim of this work was to investigate the ability of DNA-damaging agents with different mechanism of action to induce EndoG expression and to inhibit telomerase activity due to the activation of hTERT alternative splicing in normal activated human CD4+ and CD8+ Т lymphocytes. All investigated DNA-damaging agents were able to induce EndoG expression. Cisplatin, a therapeutic compound, producing DNA cross-links induced the highest level of DNA damages and EndoG expression. Incubation of CD4+ and CD8+ Т cells with cisplatin caused the changes in proportion of hTERT splice variants and inhibition of telomerase activity.

About the authors

D. D. Zhdanov

Institute of Biomedical Chemistry; Peoples Friendship University of Russia

Author for correspondence.
Email: zhdanovdd@mail.ru
Russian Federation, ul. Pogodinskaya 10, Moscow, 119121; Moscow

D. A. Vasina

Peoples Friendship University of Russia

Email: zhdanovdd@mail.ru
Russian Federation, Moscow

V. S. Orlova

Peoples Friendship University of Russia

Email: zhdanovdd@mail.ru
Russian Federation, Moscow

E. V. Orlova

Institute of Theoretical and Experimental Biophysics

Email: zhdanovdd@mail.ru
Russian Federation, Moscow

D. V. Grishin

Institute of Biomedical Chemistry

Email: zhdanovdd@mail.ru
Russian Federation, ul. Pogodinskaya 10, Moscow, 119121

Y. A. Gladilina

Institute of Biomedical Chemistry

Email: zhdanovdd@mail.ru
Russian Federation, ul. Pogodinskaya 10, Moscow, 119121

M. V. Pokrovskaya

Institute of Biomedical Chemistry

Email: zhdanovdd@mail.ru
Russian Federation, ul. Pogodinskaya 10, Moscow, 119121

S. S. Aleksandrova

Institute of Biomedical Chemistry

Email: zhdanovdd@mail.ru
Russian Federation, ul. Pogodinskaya 10, Moscow, 119121

N. N. Sokolov

Institute of Biomedical Chemistry

Email: zhdanovdd@mail.ru
Russian Federation, ul. Pogodinskaya 10, Moscow, 119121

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