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Antizyme and antizyme inhibitor activities influence cellular responses to polyamine analogs

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Summary.

Close structural analogs of spermidine and spermine, polyamine mimetics, are potential chemotheraputic agents as they depress cellular polyamines required for tumor growth. Specific mimetic analogs stimulate synthesis of the regulatory protein antizyme (AZ), which not only inactivates the initial enzyme in polyamine biosynthesis but also inhibits cellular uptake of polyamines. The role of AZ induction in influencing cellular uptake of representative analogs was investigated using three analogs produced by Cellgate Inc., CGC-11047, CGC-11102, and CGC-11144, which exhibit markedly distinct AZ-inducing potential. An inverse correlation was noted between the AZ-inducing activity of a compound and the steady-state levels accumulated in cells. As some tumor cells over express AZI as a means of enhancing the polyamines required for aggressive growth, analog sensitivity was examined in transgenic CHO cells expressing exogenous antizyme inhibitor protein (AZI). Although AZI over expression increased cell sensitivity to analogs, the degree of this affect varied with the analog used.

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Abbreviations

AZ:

antizyme

AZI:

antizyme inhibitor

CHO:

Chinese Hamster Ovary cells

DFMO:

difluoromethylornithine

HTC:

rat hepatoma cells

ODC:

ornithine decarboxylase

SPD:

spermidine

SPM:

spermine

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Authors and Affiliations

  1. Department of Biological Sciences, Northern Illinois University, DeKalb, IL, U.S.A.

    J. L. A. Mitchell, T. K. Thane, J. M. Sequeira & R. Thokala

  2. Cellgate Inc., Redwood City, CA, U.S.A.

    L. J. Marton

Authors
  1. J. L. A. Mitchell
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  2. T. K. Thane
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  3. J. M. Sequeira
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  4. L. J. Marton
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  5. R. Thokala
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Mitchell, J., Thane, T., Sequeira, J. et al. Antizyme and antizyme inhibitor activities influence cellular responses to polyamine analogs. Amino Acids 33, 291–297 (2007). https://doi.org/10.1007/s00726-007-0523-2

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  • DOI: https://doi.org/10.1007/s00726-007-0523-2

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