B7H4, a negative regulator of T cell immunity.
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Word Count
21,000 words, Guess
Page Count
84 pages
Identifiers
- ISBN-139780494212561
- ISBN-10049421256X
- Open LibraryOL19551720M
Description
Homeostasis-driven T cell proliferation appears to break tolerance and promote autoimmune responses against tumor-associated self-antigens. Furthermore, inhibitory signals, such as B7H4 and TGFbeta, are expressed by many tumors and involved in their evasion of anti-tumor immunity. We constructed B7H4/Immunoglobulin (B7H4/Ig) fusion protein, which negatively regulates T cell activation in vitro, and tested the response of homeostatically expanded T cells to B7H4/Ig. These cells displayed reduced responsiveness to B7H4/ig-mediated suppression of IFNgamma production. Moreover, in normal T cells B7H4/Ig enhanced the release of IL-10, a cytokine that reportedly inhibits IFNgamma production in T cells. In contrast, IL-10 was undetectable in homeostatically expanded T cells treated with B7H4/Ig. This further demonstrates lower sensitivity of these cells to B7H4/lg and might explain their anti-tumor reactivity. However, the response of homeostatically expanded T cells to TGFbeta was similar to that of normal T cells, presumably, due to its universal inhibitory effect on immune response.
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