Cytosine deaminase/5-fluorocytosine gene therapy can induce efficient anti-tumor effects and protective immunity in immunocompetent mice but not in athymic nude mice.

Abstract:

:Murine hepatocellular carcinoma cells were retrovirally transduced with the bacterial cytosine deaminase (CD) gene. CD-transduced cells exhibited more than 120-fold higher sensitivity to 5-fluorocytosine (5-FC) compared with parental cells. When syngeneic immunocompetent mice were inoculated s.c. with parental hepatocellular carcinoma cells containing as little as 5% CD-transduced cells, significant inhibition of tumor formation was induced by 5-FC treatment. Furthermore, established solid tumors in immunocompetent mice containing only 5% CD-transduced cells were infiltrated markedly with CD4- and CD8+ T lymphocytes and macrophages by 5-FC treatment, such that significant reduction or even complete regression of tumors was observed. These tumor-free mice resisted subsequent rechallenge with wild-type tumor. Conversely, when athymic nude mice were inoculated with a cell mixture containing CD-transduced cells and parental cells at a ratio of 40:60, all developed tumors despite 5-FC treatment. Our results indicate that gene therapy using the CD/5-FC system can induce efficient anti-tumor effects and protective immunity in immunocompetent mice but not in athymic immunodeficient mice, suggesting that the host's immunocompetence may be a critical factor for achieving successful gene therapy against cancer.

journal_name

Int J Cancer

authors

Kuriyama S,Kikukawa M,Masui K,Okuda H,Nakatani T,Sakamoto T,Yoshiji H,Fukui H,Ikenaka K,Mullen CA,Tsujii T

doi

10.1002/(sici)1097-0215(19990517)81:4<592::aid-ijc

keywords:

subject

Has Abstract

pub_date

1999-05-17 00:00:00

pages

592-7

issue

4

eissn

0020-7136

issn

1097-0215

pii

10.1002/(SICI)1097-0215(19990517)81:4<592::AID-IJC

journal_volume

81

pub_type

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