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.
Biochemistry (Moscow) Supplement Series B: Biomedical Chemistry – Springer Journals
Published: May 30, 2018
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