Abstract
IMMUNE responses are orchestrated by CD4 T lymphocytes, which receive a cognitive signal when clonally distributed receptors are occupied by major histocompatibility complex (MHC) class II-bound peptides on antigen-presenting cells (APCs)1,2. The APCs provide costimulatory signals, through macromolecules such as CD80, that regulate outcomes in terms of T-cell activation or anergy3–6. We have studied essential complementary chemical events in the form of Schiff base formation between carbonyls and amines that are constitutively expressed on presenting cell and T-cell surfaces7–9 and provide a new target for manipulation of immune responses10,11. Here we show that small Schiff base-forming molecules can substitute for the physiological donor of carbonyl groups and provide a costimulatory signal to CD4 Th-cells through a mechanism that activates clofilium-sensitive K+ and Na+ transport. One such molecule, tucaresol, enhances CD4 Th1-cell responses, selectively favouring a Thl-type profile of cytokine production. In vivo tucaresol potently enhances CD4 Th-cell priming and CDS cytotoxic T-cell priming to viral antigens, and has substantial therapeutic activity in murine models of disease.
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Rhodes, J., Chen, H., Hall, S. et al. Therapeutic potentiation of the immune system by costimulatory Schiff-base-forming drugs. Nature 377, 71–75 (1995). https://doi.org/10.1038/377071a0
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DOI: https://doi.org/10.1038/377071a0
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