Abstract
To study the mechanism of azidothymidine (AZT) cytotoxicity, human DNA was transfected to a variant of Chinese hamster V79 fibroblasts, the tr5 line. This cell line was used for this study for its elevated sensitivity to 5 µM AZT. Primary and secondary transfectants of tr5 cells using total human DNA and pSV2neo plasmid were selected by sequential incubations in AZT (20–50 µM), G418 (400 µg/ml active dose), and medium containing hypoxanthine, aminopterin, and thymidine (HAT). One DNA Alu fragment was detected in transfectants using primer TC-65, specific for human Alu sequences in the polymerase chain reaction (PCR). Moreover, cDNA of Chinese hamster α-type DNA polymerases was detected in transfectants by reverse transcriptase PCR (RT-PCR) using specific oligo-primer from a DNA polymerase-α cDNA sequence and in elevated annealing temperatures. In untransfected tr5 cells, neither of these sequences was detected. The data suggested that the genetic basis for AZT sensitivity may be related to the expression of α-type DNA polymerase, and the result indicated that AZT cytotoxicity could be reversed by transfection of appropriate human DNA into tr5 cells. This animal cell model has applications for studies of AZT metabolism and the isolation of the human gene that modulates AZT cytotoxicity.
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Mitsuya, H., Weinhold, K.J., Furman, P.A., St. Clair, M.H., Lehrman, S.N., Gallo, R.C., Bolognesi, D., Barry, D.W., and Broder, S. (1985).Proc. Natl. Acad. Sci. U.S.A. 827096–7100.
Polsky, B. (1989).Rev. Infect. Dis. 11S1648-S1663.
Popovic, M., Sarngadharan, M.G., Read, E., and Gallo, R.C. (1984).Science 224497–503.
Fischl, M.A., Richman, D.D., Hansen, N., Collier, A.C., Carey, J.T., Para, M.F., Hardy, W.D., Dolin, R., Powderly, W.G., Allan, J.D., Wong, B., Merigan, T.C., McAuliffe, V.J., Hyslop, N.E., Rhame, F.S., Balfour, H.H. Jr., Spector, S.A., Volberding, P., Pettinelli, C., and Anderson, J. (1990).J. Am. Coll. Phys. 112727–737.
St. Clair, M.H., Martin, L.J., Tudos-Williams, G., Bach, M.C., Vavro, C.L., King, D.M., Kellam, P., Kemp, S.D., and Larder, B.A. (1991).Science 2531557–1559.
Berman, E., Duigou-Osterndorf, R., Krown, S.E., Fanucchi, M.P., Chou, J., Hirsch, M.S., Clarkson, B.D., and Chou, T-C. (1989).Blood 74S1281-S1286.
Bhalla, K., Birkhofer, M., Gongrong, L., Grant, S., McLauglin, W., Cole, J., Graham, G., and Volsky, D.J. (1989).Blood 741923–1928.
Blau, I.W., Elstner, E., Waechter, M., Ihle, R., Janta-Lipinski, M.V., and Langen, P. (1989).Blut 59455.
Furman, P.A., Fye, J.A., St. Clair, M.H., Weinhold, K., Rideout, J.L., Freeman, G.A., Lehrman, S.N., Bolognesi, D.P., Broder, S., Mitsuya, H., and Barry, D.W. (1986).Proc. Natl. Acad. Sci. U.S.A. 838333–8337.
Dalakas, M.C., Illa, I., Pezeshkpour, G.H., Laukaitis, J.P., Cohen, B., and Griffin, J.L. (1990).N. Engl. J. Med. 3221098–1105.
AZT causes cancer in lab animals. (1989).Science News 136396.
Weidner, D.A., and Sommadossi, J.-P. (1990).Mol. Pharmacol. 38797–804.
Chan, T.C.K., Shaffer, L., Redmond, R., and Pennington, K.L. (1992).Proc. Am. Assoc. Cancer Res. 33394.
Weber, G., Nagai, M., Prajda, N., Nakamura, H., Szekeres, T., and Olah, E. (1991).Cancer Commun. 3127–132.
Sorrentino, B.P., Brandt, S.J., Bodine, D., Gottesman, M., Pastan, I., Cline, A., and Nienhuis, A.W. (1992).Science 25799–103.
Izuta, S., Saneyoshi, M., Sakurai, T., Suzuki, M., Kojima, K., and Yoshida, S. (1991).Biochem. Biophys. Res. Commun. 179776–783.
Vazquez-Padua, M.A., Starnes, M.C., and Chen, Y.-C. (1990).Cancer Commun. 255–62.
Weber, G., Idikawa, S., Nagai, M., and Natsumeda, Y. (1990).Cancer Commun. 2129–133.
Liu, P.K., and Norwood, T.H. (1988). Isolation and partial characterization of cell variants exhibiting hypersensitivity to aphidicolin. InDNA Replication and Mutagenesis, (ed.) Moses B. (American Society for Microbiology, Washington, D.C.), pp. 161–172.
Liu, P.K., and Norwood, T.H. (1991).Somat. Cell Mol. Genet. 171–13.
Kavanagh, T.J., Rubinstein, C., Liu, P.K., Chang, C.-C., Trosko, J.E., and Sleight, S.D. (1985).Toxicol. Appl. Pharmacol. 7991–98.
Lee, M.-S., Wang, J.C., and Beran, M. (1992).J. Mol. Biol. 223837–843.
Miller, S.A., Dykes, D.D., and Polesky, H.F. (1988).Nucleic Acids Res. 161215.
Liu, P.K., and Loeb, L.A. (1984).Science 226833–835.
Nelson, D.L., Ledbetter, S.A., Corbo, L., Victoria, M.F., Ramirez-Solis, R., Webster, T.D., Ledbetter, D.H., and Caskey, T.C. (1989).Proc. Natl. Acad. Sci. U.S.A. 866686–6690.
Wong, S.W., Wahl, A.F., Yuan, P.M., Arai, N., Pearson, B.E., Arai, K.I., Korn, D., Hunkapiller, M.W., and Wang, T.S.-F. (1988).EMBO J. 737–47.
Chomczynski, P., and Sacchi, N. (1986).Anal. Biochem. 162156–159.
Sanger, F., Niklen, S., and Coulson, A.R. (1977).Proc. Natl. Acad. Sci. U.S.A. 745463–5467.
Latron, E., Pazmany, L., Morison, J., Moots, R., Sayer, M.A., McMichael, A., and Strominger, J.L. (1992).Science 257967–971.
Liu, P.K., Goudreau, B., and Hsu, G.S. (1989).Somat. Cell Mol. Genet. 15331–344.
Ono, K., Nakane, H., Herdewijin, P., Balzarini, J., and De Clercq, E. (1989).Mol. Pharmacol. 35578–583.
Tanaka, M., Kimura, K., and Yoshida, S. (1987).Cancer Res. 475971–5974.
Huang, P., Farquhar, D., and Plunkett, W. (1990).J. Biol. Chem. 26511914–11918.
Mamber, S.W., Brookshire, K.W., and Forenza, S. (1990).Antimicrob. Agents Chemother. 341237–1243.
Nishida, C., Reinhard, P., and Linn, S. (1988).J. Biol. Chem. 263501–510.
Cotterill, S.M., Reyland, M.E., Loeb, L.A., and Lehman, I.R. (1987).Proc. Natl. Acad. Sci. U.S.A. 845635–5639.
Morrison, A., Bell, J.B., Kunkel, T.A., and Sugino, A. (1991).Proc. Natl. Acad. Sci. U.S.A. 889473–9477.
Brunetti, I., Falcone, A., Calabresi, P., Goulette, F.A., and Darnowske, J.W. (1990).Cancer Res. 504026–4031.
Chung, D.W., Zhang, J., Tan, C.-K., Davie, E.W., So, A.G., and Downey, K.M. (1991).Proc. Natl. Acad. Sci. U.S.A. 8811197–11202.
Hurwitz, J., Dean, F.B., Kwong, A.D., and Lee, S.-H. (1990).J. Biol. Chem. 26518043–18046.
Thomas, D.C., Roberts, J.D., Sabatino, R.D., Myers, T.W., Tan, C.-K., Downey, K.M., So, A.G., Bambara, R.A., and Kunkel, T.A. (1991).Biochemistry 3011751–11759.
Chen, J., Heller, D., Poon, B., Kang, L., and Wang, L.-H. (1991).Oncogene 6257–264.
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Liu, P.K. Enhanced expression of α-type DNA polymerase genes reduces AZT cytotoxicity in hamster tr5 cells. Somat Cell Mol Genet 19, 211–220 (1993). https://doi.org/10.1007/BF01233069
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DOI: https://doi.org/10.1007/BF01233069