Leukocyte immunoglobulin-like receptor subfamily A member 4

Definition:

Functions coreceptor to limit the innate immune responses to viral infections; signaling occurs via FCER1G. Down-regulates the production of IFNA1, IFNA2, IFNA4, IFNB1 and TNF by plasmacytoid dendritic cells that have been exposed to influenza virus or cytidine-phosphate-guanosine (CpG) dinucleotides, indicating it functions as negative regulator of TLR7 and TLR9 signaling cascades. Down-regulates interferon production in response to interaction with BST2 on HIV-1 infected cells. Activates a signaling cascade in complex with FCER1G that results in phosphorylation of Src family and Syk kinases and thereby triggers mobilization of intracellular Ca(2+). Does not interfere with the differentiation of plasmacytoid dendritic cells into antigen-presenting cells.

References:

[1]. Wei Cao, et al. Regulation of TLR7/9 responses in plasmacytoid dendritic cells by BST2 and ILT7 receptor interaction. J Exp Med. 2009 Jul 6;206(7):1603-14. [Content Brief]

[2]. Wei Cao, et al. Plasmacytoid dendritic cell-specific receptor ILT7-Fc epsilonRI gamma inhibits Toll-like receptor-induced interferon production. J Exp Med. 2006 Jun 12;203(6):1399-405. [Content Brief]

[3]. Barbara Tavano, et al. Effect of immunoglobin-like transcript 7 cross-linking on plasmacytoid dendritic cells differentiation into antigen-presenting cells. PLoS One. 2014 Feb 19;9(2):e89414. [Content Brief]

[4]. Mariana G Bego, et al. Vpu Exploits the Cross-Talk between BST2 and the ILT7 Receptor to Suppress Anti-HIV-1 Responses by Plasmacytoid Dendritic Cells. PLoS Pathog. 2015 Jul 14;11(7):e1005024. [Content Brief]

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