2002 Fiscal Year Final Research Report Summary
The adjuvant effects of CpG motif and activated large number of activated-T lymphocytes on immunoresponses.
| Project/Area Number |
12670262
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Bacteriology (including Mycology)
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| Research Institution | Yokohama City University |
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Principal Investigator |
HAMAJIMA Kenji Yokohama City Unv. Medicine, Dept. Bacteriology, Assist. Prof., 医学部, 助手 (00114611)
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| Co-Investigator(Kenkyū-buntansha) |
KE-QIN Xin Yokohama City Unv. Medicine, Dept. Bacteriology, Assist. Prof., 医学部, 助手 (40301452)
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| Project Period (FY) |
2000 – 2002
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| Keywords | DNA vaccine / CpG motif / adjuvant effect / CTL / activated T cell |
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| Research Abstract |
We examined whether the co-administering the CpG motifs plasmid with HIV-DNA vaccine or the transfer of a large number of activated T cells to syngenic mice immunized with vaccine can augment the specific immune responses. Co-administering the CpG-enriched plasmids with a DNA vaccine to Balb/c mice significantly increased HIV-specific cell mediated and humoral immunity. Plasmids containg a most of number of copies (20 CpG) were the most effective immune enhancers. Spleen cells from normal BALB/c were cultured with IL-2 in the anti-mouse CD3 Ab-coated flask. The number of lymphocytes increased about 10-fold.
Phenotyping analysis by flow cytometry showed, this cell population contained about 60% of CD8+/Thy1.2+, 18.5% of CD4+/Thy1.2 + and 8.9% of CD19 + cells. These activated cells were transferred via the I. p. route to mice immunized with HIV-DNA vaccine. Results indicated that transfer activated T cells 2 days after DNA vaccination increased specific cellular and humoral immunity. Both co-administering the CpG motif plasmid and the transfer activated T lymphocytes showed stronger adjuvant activity. These adjuvant methods may induce not only HIV-mediated immune responses but also other infectious diseases-mediated immune responses in the human population as well. These administrations are likely to be of clinical benefit because their simplicity, lack of side effects and safety.
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Research Products
(28 results)
