Induction of CD4(+) T cell-dependent CD8(+) type 1 responses in humans by a malaria DNA vaccine.
Level II
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- Record sourced from PubMed, PMID 11526203.
- Also identified by PMC identifier 58557.
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Abstract
We assessed immunogenicity of a malaria DNA vaccine administered by needle i.m. or needleless jet injection [i.m. or i.m./intradermally (i.d.)] in 14 volunteers. Antigen-specific IFN-gamma responses were detected by enzyme-linked immunospot (ELISPOT) assays in all subjects to multiple 9- to 23-aa peptides containing class I and/or class II restricted epitopes, and were dependent on both CD8(+) and CD4(+) T cells. Overall, frequency of response was significantly greater after i.m. jet injection. CD8(+)-dependent cytotoxic T lymphocytes (CTL) were detected in 8/14 volunteers. Demonstration in humans of elicitation of the class I restricted IFN-gamma responses we believe necessary for protection against the liver stage of malaria parasites brings us closer to an effective malaria vaccine.
Medical subject headings
- CD4-Positive T-Lymphocytes
- DNA, Protozoan
- Malaria Vaccines
- Plasmodium falciparum
- Protozoan Proteins
- T-Lymphocytes, Cytotoxic
- Vaccines, DNA