alexa The yins of T cell activation.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Liu JO

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Abstract Transcription factors activated in response to T cell receptor (TCR) signaling include nuclear factor of activated T cells (NFAT) family, which is highly phosphorylated and thereby maintained in the cytoplasm of resting T cells, the nuclear factor NF-kappaB, which is kept in the cytoplasm of resting cells through its association with the inhibitor protein IkappaB, and activating protein-1 (AP-1), which is only transcribed after TCR stimulation. Negative regulators of TCR signaling can be divided into two groups: Class 1 regulators help maintain the quiescent state of unstimulated T cells, whereas class 2 regulators are themselves transcriptionally induced in response to TCR signaling and serve to limit and terminate the activating signal. Class 1 regulators include the autoinhibitory domain of the phosphatase calcineurin; IkappaB and its transcriptional activators Foxj1 and Foxo3a; and various transcriptional coregulators that inhibit interleukin-2 (IL-2) production. Class 2 regulators include the calcipressins, which, like NFATp and NFAT4 are feedback inhibitors of calcineurin-NFAT signaling, IkappaB, and the mitogen-activated protein kinase (MAPK) phosphatases, which inhibit MAPK signaling and thus the nuclear localization of AP-1 components. This article was published in Sci STKE and referenced in Journal of Clinical & Cellular Immunology

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