Influence of 3'-azido-2',3'-dideoxyguanosine treatment on amounts of TERT and POT1 in human HL60 cells. 2008

Xiaohong Liu, and Tsukasa Ogawara, and Yuichi Kurashina, and Mineo Saneyoshi, and Toyofumi Yamaguchi
Biotechnology Research Center, Teikyo University of Science and Technology, Uenohara, Yamanashi 409-0193, Japan.

In human cells, TERT (telomerase reverse transcriptase) is involved in the synthesis of telomere DNA, and POT1 (protection of telomeres 1) is believed to be a regulator of telomere length. We have reported that long-term treatment of human HL60 cells with 50 microM 3'-azido-2',3'-dideoxyguanosine (AZddG) caused telomeres to shorten significantly during early passages (up to 40-50 days), but that telomere length was then stabilized at approximately 2 kbp during later passages. Additionally, cell growth rates showed no obvious change during culture in the presence of 50 microM AZddG. Western blot analysis of these cells showed that the amounts of TERT and POT1 expressed were increased significantly and slightly, respectively. Furthermore, telomeric 3' G-overhangs (G-tails) of AZddG-treated cells were lengthened. These findings suggest that HL60 cells may develop resistance to telomere erosion induced by AZddG.

UI MeSH Term Description Entries
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000089804 Shelterin Complex A TELOMERE cap complex consisting of telomere-specific proteins in association with telomeric DNA such as telomeric dsDNA-sDNA junction. They are involved in the protection of chromosome ends and TELOMERASE regulation and play a role in CELLULAR SENESCENCE and ageing-related pathology. In general it consists of six mostly TELOMERE-BINDING PROTEINS (POT1, RAP1, TIN2, TPP1, TRF1, and TRF2). CST Complex,Ctc1-Stn1-Ten1 Complex,POT1-TPP1 Shelterin Complex,Telomere Cap Complex,Telomere POT1-TPP1 Complex,Telomeric Capping Complex,Telomeric Stn1-Ten1 Capping Complex,Telosome,Capping Complex, Telomeric,Complex, CST,Complex, Ctc1-Stn1-Ten1,Complex, POT1-TPP1 Shelterin,Complex, Shelterin,Complex, Telomere POT1-TPP1,Complex, Telomeric Capping,Ctc1 Stn1 Ten1 Complex,POT1 TPP1 Shelterin Complex,POT1-TPP1 Complex, Telomere,Shelterin Complex, POT1-TPP1,Telomere POT1 TPP1 Complex,Telomeric Stn1 Ten1 Capping Complex,Telosomes
D015224 Dideoxynucleosides Nucleosides that have two hydroxy groups removed from the sugar moiety. The majority of these compounds have broad-spectrum antiretroviral activity due to their action as antimetabolites. The nucleosides are phosphorylated intracellularly to their 5'-triphosphates and act as chain-terminating inhibitors of viral reverse transcription. 2',3'-Dideoxynucleosides,Dideoxyribonucleosides,ddNus,2',3' Dideoxynucleosides
D018922 HL-60 Cells A promyelocytic cell line derived from a patient with ACUTE PROMYELOCYTIC LEUKEMIA. HL-60 cells lack specific markers for LYMPHOID CELLS but express surface receptors for FC FRAGMENTS and COMPLEMENT SYSTEM PROTEINS. They also exhibit phagocytic activity and responsiveness to chemotactic stimuli. (From Hay et al., American Type Culture Collection, 7th ed, pp127-8) HL60 Cells,Cell, HL60,Cells, HL60,HL 60 Cells,HL-60 Cell,HL60 Cell
D019098 Telomerase An essential ribonucleoprotein reverse transcriptase that adds telomeric DNA to the ends of eukaryotic CHROMOSOMES. Telomerase Catalytic Subunit,Telomerase Reverse Transcriptase,Telomerase Reverse Transcriptase Catalytic Subunit,Catalytic Subunit, Telomerase,Reverse Transcriptase, Telomerase,Subunit, Telomerase Catalytic,Transcriptase, Telomerase Reverse
D034501 Telomere-Binding Proteins Proteins that specifically bind to TELOMERES. Proteins in this class include those that perform functions such as telomere capping, telomere maintenance and telomere stabilization. Telomere-Binding Protein,Double-Stranded Telomere-Binding Proteins,Double-Stranded Telomeric Binding Protein,Single-Stranded Telomere-Binding Protein,Single-Stranded Telomere-Binding Proteins,Telomer-Binding Protein, alpha-Subunit,Telomer-Binding Protein, beta-Subunit,Telomere End-Binding Protein (TEBP),Telomere Repeat Binding Factor,Telomere Repeat Binding Factors,Telomere Repeat Binding Proteins,Telomere-Binding Proteins, Double Stranded,Telomere-Binding Proteins, Single-Stranded,alpha-Telomere-Binding Protein,beta-Telomere-Binding Protein,Double Stranded Telomere Binding Proteins,Double Stranded Telomeric Binding Protein,Protein, Telomere-Binding,Single Stranded Telomere Binding Protein,Single Stranded Telomere Binding Proteins,Telomer Binding Protein, alpha Subunit,Telomer Binding Protein, beta Subunit,Telomere Binding Protein,Telomere Binding Proteins,Telomere Binding Proteins, Double Stranded,Telomere Binding Proteins, Single Stranded,Telomere-Binding Protein, Single-Stranded,Telomere-Binding Proteins, Double-Stranded,alpha Telomere Binding Protein,alpha-Subunit Telomer-Binding Protein,beta Telomere Binding Protein,beta-Subunit Telomer-Binding Protein

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