Lipopolysaccharide stimulation converts vigorously washed dendritic cells (DCs) to nonexhausted DCs expressing CD70 and evoking long-lasting type 1 T cell responses.
A great variety of in vitro culture protocols for human monocyte-derived dendritic cells (mo-DCs) has been used to generate DCs suitable for use in immunotherapy. It is thought that activated DCs undergo one-way differentiation into "exhausted" DCs. In the present study, we contrived an in vitro method for facilitating expression of CD70 by mature DCs. This was achieved by vigorous washing of mo-DCs before exposure to lipopolysaccharide (LPS). Unexpectedly, these mature DCs retain expression of some interleukin (IL)-12 family members after extended periods and maintain their ability to stimulate type 1 T cell responses. In contrast, DCs exposed to IL-4 before LPS stimulation or LPS-stimulated DCs not exposed to washing stress before activation failed to express CD70 and did differentiate into exhausted DCs. It is interesting that DCs expressing CD70 (CD70+ DCs) induced interferon-gamma production from purified, allogeneic CD8+ T cells through a direct CD27-CD70 interaction. This is evidence for a pathway resulting in generation of CD8 T effectors by B7-independent mechanisms. These data suggest that exposure of immature DCs to LPS stimulation contributes to their terminal differentiation into CD70+ DCs, which have potent ability to prolong type 1 T cell responses through alternative pathways.
Iwamoto
Sanju
S
Department of Biochemistry, School of Medicine, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, 142-8555, Japan. iwasanju@med.showa-u.ac.jp
Ishida
Makoto
M
Takahashi
Keiko
K
Takeda
Ken
K
Miyazaki
Akira
A
D019264:Adoptive Transfer; D015703:Antigens, CD / Q000096:biosynthesis* / Q000276:immunology; D018122:B7-1 Antigen / Q000276:immunology; D053282:CD27 Ligand; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D002454:Cell Differentiation / Q000187:drug effects* / Q000276:immunology; D002478:Cells, Cultured; D018920:Coculture Techniques; D003713:Dendritic Cells / Q000166:cytology / Q000382:microbiology* / Q000637:transplantation; D005786:Gene Expression Regulation / Q000276:immunology; D006801:Humans; D007156:Immunologic Memory / Q000187:drug effects / Q000276:immunology; D018664:Interleukin-12 / Q000096:biosynthesis / Q000276:immunology; D015847:Interleukin-4 / Q000276:immunology / Q000494:pharmacology; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008565:Membrane Proteins / Q000096:biosynthesis* / Q000276:immunology; D009000:Monocytes / Q000166:cytology / Q000276:immunology*; D015398:Signal Transduction / Q000276:immunology; D018417:Th1 Cells / Q000276:immunology*; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000276:immunology
D015703:Antigens, CD; D018122:B7-1 Antigen; D053282:CD27 Ligand; C505771:CD70 protein, human; D008070:Lipopolysaccharides; D008565:Membrane Proteins; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7; D018664:Interleukin-12; D015847:Interleukin-4