Abstract:
:Immunostimulatory DNA containing unmethylated cytosine-guanine (CpG) motifs have been successfully used as adjuvants to enhance the immunity of vaccines designed to trigger antitumor T-cell responses. We examined the effect of a CpG oligodeoxynucleotide (CpG ODN) for its ability to potentiate the activity of tumor antigen-pulsed dendritic cells (DC) in a clinically relevant mouse model, which is transgenic for both carcinoembryonic antigen (CEA) and HLA-A2 for the treatment of colon carcinoma in a therapeutic setting. The systemic administration of CpG ODN 1826 alone had modest effect on tumor growth when tumors were palpable and had no effect with larger tumor burden. However, coadministration of CpG ODN 1826 with the vaccine provided significant increase in tumor-free survival compared with mice immunized with DC-based vaccines alone. The DC/CpG combined vaccination strategy resulted in increased secretion of Th1 cytokines and HLA-A2-restricted CEA-specific CTL responses were also enhanced. Both tumor regression and extended tumor-free survival resulting from DC/CpG combination therapy required the participation of T cells. Tumor-free mice were resistant to tumor rechallenge and immunity conferred by the vaccine was transferable in athymic nude mice. These results provide evidence that vaccination with antigen-pulsed DC with CpG ODN as adjuvant can lead to effective tumor regression and long-term survival in a murine model of colon carcinoma.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Saha A,Bhattacharya-Chatterjee M,Foon KA,Celis E,Chatterjee SKdoi
10.1002/ijc.24009subject
Has Abstractpub_date
2009-02-15 00:00:00pages
877-88issue
4eissn
0020-7136issn
1097-0215journal_volume
124pub_type
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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abstract::Normal human fibroblasts obtained from a whole embryo were malignantly transformed with only 60Co gamma rays, but after extensive passage. The fibroblasts were exposed intermittently to 60Co gamma rays, 13 times, 2,800 rads in total, from the primary culture to the 40th passage level. At the 50th passage level the cel...
journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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