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In vivo gene therapy of cancer with E. coli purine nucleoside phosphorylase.
- Source :
-
Human gene therapy [Hum Gene Ther] 1997 Sep 20; Vol. 8 (14), pp. 1637-44. - Publication Year :
- 1997
-
Abstract
- We have developed a new strategy for the gene therapy of cancer based on the activation of purine nucleoside analogs by transduced E. coli purine nucleoside phosphorylase (PNP, E.C. 2.4.2.1). The approach is designed to generate antimetabolites intracellularly that would be too toxic for systemic administration. To determine whether this strategy could be used to kill tumor cells without host toxicity, nude mice bearing human malignant D54MG glioma tumors expressing E. coli PNP (D54-PNP) were treated with either 6-methylpurine-2'-deoxyriboside (MeP-dR) or arabinofuranosyl-2-fluoroadenine monophosphate (F-araAMP, fludarabine, a precursor of F-araA). Both prodrugs exhibited significant antitumor activity against established D54-PNP tumors at doses that produced no discernible systemic toxicity. Significantly, MeP-dR was curative against this slow growing solid tumor after only 3 doses. The antitumor effects showed a dose dependence on both the amount of prodrug given and the level of E. coli PNP expression within tumor xenografts. These results indicated that a strategy using E. coli PNP to create highly toxic, membrane permeant compounds that kill both replicating and nonreplicating cells is feasible in vivo, further supporting development of this cancer gene therapy approach.
- Subjects :
- Animals
Antimetabolites, Antineoplastic toxicity
Escherichia coli enzymology
Escherichia coli genetics
Genetic Vectors genetics
Humans
Mice
Mice, Nude
Neoplasm Transplantation
Purine Nucleosides therapeutic use
Purine Nucleosides toxicity
Purine-Nucleoside Phosphorylase genetics
Retroviridae genetics
Vidarabine Phosphate analogs & derivatives
Vidarabine Phosphate therapeutic use
Vidarabine Phosphate toxicity
Antimetabolites, Antineoplastic therapeutic use
Genetic Therapy methods
Glioma drug therapy
Prodrugs pharmacology
Purine-Nucleoside Phosphorylase physiology
Subjects
Details
- Language :
- English
- ISSN :
- 1043-0342
- Volume :
- 8
- Issue :
- 14
- Database :
- MEDLINE
- Journal :
- Human gene therapy
- Publication Type :
- Academic Journal
- Accession number :
- 9322865
- Full Text :
- https://doi.org/10.1089/hum.1997.8.14-1637