What is TLR7 ligand?
Toll-like receptor (TLR) 7 and TLR8 are endosomal receptors that play an important role in the immune response to viral infection. They recognize GU-rich short single-stranded RNA (ssRNA) as their natural ligand, as well as small synthetic molecules, such as imidazoquinolines and nucleoside analogs.
What is TLR7 gene?
TLR7 (Toll Like Receptor 7) is a Protein Coding gene. Diseases associated with TLR7 include Immunodeficiency 74, Covid19-Related, X-Linked and X-Linked Immunodeficiency 74. Among its related pathways are TRAF6 mediated induction of NFkB and MAP kinases upon TLR7/8 or 9 activation and SARS-CoV-2 Infection.
What produces TLR7?
Signaling in human immune cells by TLR7 has been documented to trigger production of pro-inflammatory cytokines including TNF-α, IL-6, IL-1β, IL-12, and IFN-α (61, 66–69).
What is the function of TLR7?
TLR7 recognizes single-stranded RNA in endosomes, which is a common feature of viral genomes which are internalised by macrophages and dendritic cells. TLR7 recognizes single-stranded RNA of viruses such as HIV and HCV. TLR7 can recognize GU-rich single-stranded RNA.
What does TLR7 recognize?
TLR7 is an endosomal sensor that recognizes ssRNA viruses and synthetic oligoribonucleotides (ORN) such as imidazoquinoline, imiquimod, and R-848 [2,14,18]. The ORNs sensed by TLR7 are typically AU rich. TLR7 is primarily, but not only, expressed in hematopoietic cells such as plasmacytoid DCs (pDCs) and B cells [35].
Why is it called toll like receptors?
TLRs received their name from their similarity to the protein coded by the toll gene.
Where is TLR7 found within the cell?
TLR7 is primarily, but not only, expressed in hematopoietic cells such as plasmacytoid DCs (pDCs) and B cells [35]. Upon engagement with nucleic acid ligands, TLR7 translocates from the endoplasmic reticulum (ER) to a specialized lysosome-related organelle, a process that requires adaptor protein 3 and Slc15a4 [36,37].
What is TLR7 agonist?
TLR 7 agonists are small molecules. They stimulate innate immune cells leading to the activation of humoral and cellular immunity, thus engendering a series of anti-tumor activities. The mechanism of action of TLR7 agonists is associated with the MYD88-dependent pathway and caspase-dependent mitochondrial pathway.
Where is the TLR7 located in a cell?
TLR7 and its functionally related gene TLR8, located on the X chromosome, encode proteins that recognize endogenous RNA-containing autoantigens and induce the production of IFN-α, leading to autoimmunity.
What cells is TLR7 expressed in?
TLR7 is primarily, but not only, expressed in hematopoietic cells such as plasmacytoid DCs (pDCs) and B cells [35].
What is TLR7 and TLR8?
TLR7 and TLR8 are pattern recognition receptors that reside in the endosome and are activated by ssRNA molecules. TLR7 and TLR8 are normally part of the antiviral defense response, but they have also been implicated as drivers of autoimmune diseases such as lupus.
What is the role of toll like receptors?
Toll-like receptors (TLRs) are a class of pattern recognition receptors (PRRs) that initiate the innate immune response by sensing conserved molecular patterns for early immune recognition of a pathogen (1).
What cells express TLR7 and TLR8?
2B). Our results indicate that the main cell types expressing TLR7 are B cells, DCs, and monocytes, whereas the cell types with the highest TLR8 expression are DCs, monocytes, and granulocytes.
Where are TLR7 and 8 found?
TLR7 and its functionally related gene TLR8, located on the X chromosome, encode proteins that recognize endogenous RNA-containing autoantigens and induce the production of IFN-α, leading to autoimmunity. There is compelling evidence supporting the contribution of TLR7 to the development of SLE.
Why is it called toll-like receptors?
Is TLR7 on the cell surface?
Cell surface TLR7 was also detected on macrophage cell lines and peripheral blood monocytes (Supplementary Fig. 1). These results demonstrate that TLR7 is expressed on the surface of innate immune cells. Figure 1: TLR7 is expressed on the cell surface.
What is CpG TLR9?
TLR9 is a receptor for bacterial unmethylated CpG-containing DNA and for host-derived denatured DNA from apoptotic cells [11,236,237,189]. From: Advances in Clinical Chemistry, 2013.
What is the difference between TLR7 and TLR8?
TLR7 and TLR8 are phylogenetically and structurally related. TLR7 is predominantly expressed in lung, placenta, and spleen, while TLR8 is predominantly expressed in lung and peripheral blood leukocytes, in particular monocytes.
What cells are TLR7 expressed on?
Where is TLR7 located in the cell?
TLR7/TLR8. TLR7 and its functionally related gene TLR8, located on the X chromosome, encode proteins that recognize endogenous RNA-containing autoantigens and induce the production of IFN-α, leading to autoimmunity.