Abstract
Telomerase activity was found to be high in various human cancers, but absent in most normal tissues. Its expression pattern made it a novel target for antitumor agents. Several strategies against telomerase were presented in this review. Targeting the telomerase RNA component by oligonucleotide/ribozyme was considered to be one of the most hopeful approaches. Some progresses were made in this area, such as the use of PANs and 2–5A antisense compounds. The relationships among telomerase activity and cell differentiation, signal transduction, oncogene, tumor suppressor gene as well as cell cycle modulation also provided a series of valuable ideas in designing anti-telomerase drugs for cancer therapy. In conclusion, although there is still a long way in understanding the mechanism and regulation of telomerase, the advance of studies on telomerase has allowed the development of numerous strategies for the treatment of cancer.
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References
Wang XW, Xu, B. Screening models and methods of antitumor drugs. Chin J Pharmaceu 1997; 28:39.
Robert J. Anticancer drug screening within vitro models. Drugs Fut 1997; 22:739.
Jonhson RK. Screening methods in antineoplastic drug discovery. J Natl Cancer Inst 1990; 82:1082.
Wang XW, Xu B. Stimulation of tumor cell growth by alpha-fetoprotein. Int J Cancer 1998; 75:596.
Wang XW, Xu B. Informational drugs and gene therapy of human diseases. Chin Pharmacol Bull 1996; 12:289.
Wang XW, Xu B. Several new targets of antitumor agents. Acta Pharmacol Sin 1997; 18:289.
Blackburn EH. Telomerase. Ann Rev Biochem 1992; 61:113.
Zakian VA. Structures and function of telomeres. Ann Rev Genet 1989; 23:579.
Feng J, Funk WD, Wang SS, et al. The RNA component of human telomerase. Science 1995; 269:1236.
Harrington L, Mcphail T, Mar V, et al. A mammalian telomerase-associated protein. Science 1997; 275: 973.
Counter CM, Meyerson M, Eaton EN, et al. The catalytic subunit of yeast telomerase. Proc Natl Acad Sci USA 1997; 94:9202.
Rhyu M. Telomeres, telomerase, immortality. J Natl Cancer Inst 1995; 87:885.
Dahse R, Fiedler W, Ernst G. Telomeres and telomerase: biological and clinical importance. Clin Chem 1997; 43:708.
Greider CW. Telomerase activity, cell proliferation and cancer. Proc Natl Acad Sci USA 1998; 95:90.
Lee HW, Blasco MA, Gottlieb, GJ, et al. Essential role of mouse telomerase in highly proliferative organs. Nature 1998; 392:569.
Yu GL, Bradley JD, Attardi LD, et al.In vivo alteration of telomerase sequences and senescence caused by mutated Tetrahymena telomere RNAs. Nature 1990; 344:126.
Wittung H, Nielsen P, Buchardt, O, et al. DNA-like double helix formed by peptide nucleic acid. Nature 1994; 368:561.
Norton J, Piatyszek M, Wright W, et al. Inhibition of human telomerase activity by peptide nucleic acids. Nature Biotechnol 1996; 14:615.
Kanazawa Y, Ohkawa K, Ueda K, et al. Hammerhead ribozyme-mediated inhibition of telomerase activity in extracts of human hepatocellular carcinoma cells. Biochem Biophy Res Commun 1996; 225:570.
Collins SJ. The HL-60 promyelocytic leukemia cell line: proliferation, differentiation and cellular oncogene expression. Blood 1987; 70:1233.
Bestilny LJ, Brown CB, Miura Y, et al. Selective inhibition of telomerase activity during terminal differentiation of immortal cell lines. Cancer Res 1996; 56:3796.
Meyerson M, Counter CM, Eaton EN, et al. hEST2, the putative human telomerase catalytic subunit gene, is up-regulated in tumor cells and during immortalization. Cell 1997; 90:785.
Ramakrishuan S, Eppenberger U, Mueller H, et al. Expression profile of the putative catalytic subunit of the telomerase gene. Cancer Res 1998; 58:622.
Li H, Zhao LL, Funder JW, et al. Protein phosphatase 2A inhibits nuclear telomerase activity in human breast cancer cells. J Biol Chem 1997; 272:16729.
Ku WC, Cheng AJ, Wang TC. Inhibition of telomerase activity by PKC inhibitors in human nasopharyngeal cancer cells in culture. Biochem Biophy Res Commun 1997; 241:730.
Whartenby KA, Abboud CN, Marrogi AJ, et al. The biology of cancer gene therapy. Lab Invest 1996; 72:131.
Fujirmoto K, Takahashi M. Telomerase activity in human leukemic cell lines is inhibited by antisense pentadecadeoxynucleotides targeted against c-myc mRNA. Biochem Biophy Res Commun 1997; 241:775.
Kallassy M, Martel N, Damonv O, et al. Growth arrest of immortalized human keratinocytes and suppression of telomerase activity by p21WAF1 gene expression. Mol Carcinog 1998; 21:26.
Maxwell SA, Capp D, Acosta SA. Telomerase activity in immortalized endothelial cells undergoing p53-mediated apoptosis. Biochem Biophy Res Commun 1997; 241:642.
Landberg G, Nielsen NH, Nilsson P, et al. Telomerase activity is associated with cell cycle deregulation in human breast cancer. Cancer Res 1997; 57:549.
Zhu X, Kumar R, Mandal M, et al. Cell cycle-dependent modulation of telomerase activity in tumor cells. Proc Natl Acad Sci USA 1996; 93:6091.
Strahl C, Blackburn EH. The effects of nucleoside analogs on telomerase and telomeres in Tetrahymena. Nucleic Acids Res 1994; 22:893.
Yegorov YE, Chernov DN, Akimov SS. Reverse transcriptase inhibitors suppress telomerase function and induce senescence-like processes in cultured mouse fibroblasts. FEBS Letters 1996; 389:115.
Strahl C, Blackburn EH. Effects of reverse transcriptase inhibitors on telomere length and telomerase activity in two immortalized human cell lines. Mol Cell Biol 1996; 16:53.
Fletcher TM, Salazar M, Chen SF. Human telomerase inhibition by 7-deaza-2′-deoxypurine nucleoside triphosphates. Biochem 1996; 35:15611.
Pai RB, Pai SB, Kukhanova M, et al. Telomerase from human leukemia cells: properties and its interaction with deoxynucleoside analogues. Cancer Res 1998; 58: 1909.
Ohmura H, Tahara H, Suzuki M, et al. Restoration of the cellular senescence program and repression of telomerase by human chromosomes. Jpn J Cancer Res 1995; 86:899.
Shimura M, Barrett JC. Multiple pathways to cellular senescence: role of telomerase repressors. Eur J Cancer 1997; 33:703.
Nugent CZ, Hughes TR, Liu NF, et al. Cdc13p: a single-strand telomeric DNA-binding protein with a dural role in yeast telomere mainitenance. Science 1996; 274:249.
Kim NW, Piatyszek MA, Prowse R, et al. Specific association of human telomerase activity with immortal cells and cancer. Science 1994; 266:2011.
Katoh M, Kameyama M, Kugoh H, et al. A repressor function for telomerase activity in telomerase-negative immortal cells. Mol Carcinog 1998; 21:17.
Zhang RG, Wang XW, Yuan JH, et al. Human hepatoma cell telomerase activity inhibition and cell cycle modulation by its RNA component antisense oligodeoxyribonucleotides. Acta Pharmacol Sin 2000; (in press).
Zhang RG, Yuan JH, **e H. Telomerase and tumor. Chin J Cell Biol 2000; 22:25.
Zhang RG, Wang XW, Yuan JH, et al. Using a non-radioisotopic, quantitative TRAP-based method detecting telomerase activities in human hepatoma cells. Cell Res 2000; (in press).
Zhang RG, Wang XW, **e H. Progress on mechanism of telomerase activation. Prog Biochem Biophy (China) 2000; (in press).
Yuan JH, **e H. Progress in research on telomerase. Chin Bull Life Sci 1999; 11:111.
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Zhang, Rg., Yuan, Jh., Wang, Xw. et al. Telomerase: A novel target of antitumor agents. Chin J Cancer Res 12, 39–45 (2000). https://doi.org/10.1007/BF02983192
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DOI: https://doi.org/10.1007/BF02983192