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Title 

Adenovirus-mediated interleukin-18 mutant in vivo gene transfer inhibits tumor growth through the induction of T cell immunity and activation of natural killer cell cytotoxicity

Authors 

Kyung Sun HwangWon-Kyung ChoJin Sang YooY R SeongB K KimS Y KimDong Soo Im

Publisher 

Nature Publishing Group

Issue Date 

2004

Citation 

Cancer Gene Therapy, vol. 11, no. 6, pp. 397-407

Keywords 

adenovirus vectorIL-18 mutantliver cancerrenal cancerCD4 antigenCD8 antigencomplementary DNAgranulocyte macrophage colony stimulating factorinterleukin 18

Abstract 

We report here that gene transfer using recombinant adenoviruses encoding interleukin (IL)-18 mutants induces potent antitumor activity in vivo. The precursor form of IL-18 (ProIL-18) is processed by caspase-1 to produce bioactive IL-18, but its cleavage by caspase-3 (CPP32) produces an inactive form. To prepare IL-18 molecules with an effective antitumor activity, a murine IL-18 mutant with the signal sequence of murine granulocyte-macrophage (GM)- colony stimulating factor (CSF) at the 5′-end of mature IL-18 cDNA (GMmIL-18) and human IL-18 mutant with the prepro leader sequence of trypsin (PPT), which is not cleaved by caspase-3 (PPThIL-18CPP32-), respectively, were constructed. Adenovirus vectors carrying GMmIL-18 or PPThIL-18CPP32- produced bioactive IL-18. Ad.GMmIL-18 had a more potent antitumor effect than Ad.mProIL-18 encoding immature IL-18 in renal cell adenocarcinoma (Renca) tumor-bearing mice. Tumor-specific cytotoxic T lymphocytes, the induction of Th1 cytokines, and an augmented natural killer (NK) cell activity were detected in Renca tumor-bearing mice treated with Ad.GMmIL-18. An immunohistological analysis revealed that CD4+ and CD8+ T cells abundantly infiltrated into tumors of mice treated with Ad.GMmIL-18. Huh-7 human hepatoma tumor growth in nude mice with a defect of T cell function was significantly inhibited by Ad.PPThIL-18CPP32- compared with Ad.hProIL-18 encoding immature IL-18. Nude mice treated with Ad.PPThIL-18CPP32- contained NK cells with increased cytotoxicity. The results suggest that the release of mature IL-18 in tumors is required for achieving an antitumor effect including tumor-specific cellular immunity and augmented NK cell-mediated cytotoxicity. These optimally designed IL-18 mutants could be useful for improving the antitumor effectiveness of wild-type IL-18.

ISSN 

0929-1903

Link 

http://dx.doi.org/10.1038/sj.cgt.7700711

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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