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Class I transactivator, NLRC5: a central player in the MHC class I pathway and cancer immune surveillance

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Abstract

Major histocompatibility complex (MHC) class I and class II molecules play critical roles in the activation of the adaptive immune system by presenting antigens to CD8+ and CD4+ T cells, respectively. Although it has been well known that CIITA (MHC class II transactivator), an NLR (nucleotide-binding domain, leucine-rich-repeat containing) protein, as a master regulator of MHC class II gene expression, the mechanism of MHC class I gene transactivation was unclear. Recently, another NLR protein, NLRC5 (NLR family, CARD domain-containing 5), was identified as an MHC class I transactivator (CITA). NLRC5 is a critical regulator for the transcriptional activation of MHC class I genes and other genes involved in the MHC class I antigen presentation pathway. CITA/NLRC5 plays a crucial role in human cancer immunity through the recruitment and activation of tumor killing CD8+ T cells. Here, we discuss the molecular function and mechanism of CITA/NLRC5 in the MHC class I pathway and its role in cancer.

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Acknowledgements

This work was supported by grants from the American Lung Association, National Multiple Sclerosis Society, Texas A&M Clinical Science & Translational Research Institute, TAM Genomics to KSK.

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Correspondence to Koichi S. Kobayashi.

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This article is part of the Topical Collection on Biology and Evolution of Antigen Presentation

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Vijayan, S., Sidiq, T., Yousuf, S. et al. Class I transactivator, NLRC5: a central player in the MHC class I pathway and cancer immune surveillance. Immunogenetics 71, 273–282 (2019). https://doi.org/10.1007/s00251-019-01106-z

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  • DOI: https://doi.org/10.1007/s00251-019-01106-z

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