Abstract
Adaptive and innate immune systems play essential roles in the recognition and elimination of microbial pathogens, such as viruses, bacteria, fungi, and parasites. In adaptive immunity, T cells and B cells induce immune responses through their respective antigen receptors, called T-cell receptors and B-cell receptors, both of which specifically recognize antigens or antigenic peptides derived from microbial pathogens. In innate immunity, germline-encoded pattern recognition receptors (PRRs) serve as sensors that detect the pathogen-associated molecular patterns found in microbial pathogens. PRRs have been classified into different families: the toll-like receptor family, nucleotide binding domain and leucine-rich repeat-containing receptor family, retinoic acid-inducible gene I-like receptor family, and C-type lectin receptor family. Upon the recognition of microbial pathogens, antigen receptors or PRRs initiate various signaling pathways, leading to the activation of different transcriptional programs that provoke immune responses in order to eliminate invaded pathogens. In this chapter, I describe small-molecule modulators that target specific steps in the intracellular signaling pathways induced by antigen receptors, PRRs, and inflammatory cytokine receptors.
Keywords
Antigen receptor C-type lectin receptor Fas Granzyme Inflammasome Nuclear factor κB Perforin RIG-I-like receptor Toll-like receptor Tumor necrosis factor receptorAbbreviations
- ASC:
apoptosis-associated speck-like protein containing a CARD
- BCL10:
B-cell lymphoma 10
- BCR:
B-cell receptors
- BTK:
Burton’s tyrosine kinase
- CARD:
caspase recruitment domain
- CARMA1:
caspase recruitment domain-containing membrane-associated guanylate kinase protein 1
- CLR:
C-type lectin receptor
- CRIDs:
cytokine release inhibitory drugs
- CTLs:
cytotoxic T lymphocytes
- DAG:
diacylglycerol
- DISC:
death-inducing signaling complex
- EGTA:
ethylene glycol-bis(β-aminoethylether)-N,N,N′,N′-tetraacetic acid
- ER:
endoplasmic reticulum
- FADD:
Fas-associated death domain protein
- FasL:
Fas ligand
- IFN:
interferon
- IκB:
inhibitor of NF-κB
- IKK:
IκB kinase
- IL:
interleukin
- IL-1R:
IL-1 receptor
- IP3:
inositol-1,4,5-trisphosphate
- IPS-1:
IFN-β promoter stimulator 1
- IRAK:
IL-1 receptor-associated kinase
- IRFs:
IFN regulatory factors
- ITAMs:
immunoreceptor tyrosine-based activation motifs
- ITK:
interleukin-2-inducible T-cell kinase
- LBP:
LPS binding protein
- LGP2:
laboratory of genetics and physiology 2
- LPS:
lipopolysaccharide
- MACPF:
membrane attack complex perforin
- MALT1:
mucosa-associated lymphoid tissue lymphoma-translocation gene 1
- MD-2:
myeloid differentiation factor 2
- MDA5:
melanoma differentiation-associated gene 5
- MyD88:
myeloid differentiation primary response gene 88
- NFAT:
nuclear factor of activated T cells
- NF-κB:
nuclear factor κB
- NK:
natural killer
- NLR:
nucleotide binding domain and leucine-rich repeat-containing receptor
- PAMPs:
pathogen-associated molecular patterns
- PDK1:
3-phosphoinositide-dependent kinase 1
- PI3K:
phosphatidylinositol 3-kinase
- PIP3:
phosphatidylinositol-3,4,5-trisphosphate
- PKC:
protein kinase C
- PLC:
phospholipase C
- PTKs:
protein tyrosine kinases
- PRRs:
pattern recognition receptors
- PYD:
pyrin domain
- RIG-I:
retinoic acid-inducible gene I
- RIP:
receptor-interacting protein
- RLR:
retinoic acid-inducible gene I-like receptor
- ROS:
reactive oxygen species
- SYK:
spleen tyrosine kinase
- TAK1:
TGF-β-activated kinase 1
- TBK1:
TANK binding kinase 1
- TCR:
T-cell receptors
- TIR:
toll/IL-1R
- TIRAP:
TIR domain-containing adaptor protein
- TLR:
toll-like receptor
- TNF:
tumor necrosis factor
- TNF-R1:
TNF receptor 1
- TRAF:
TNF receptor-associated factor
- TRAM:
TRIF-related adaptor molecule
- TRIF:
TIR domain-containing adaptor inducing IFN-β
- Z-VRPR-fmk:
benzyloxycarbonyl-Val-Arg-Pro-Arg-fluoromethylketone
Notes
Acknowledgments
I sincerely thank Dr. Hiroyuki Koshino for his help in confirming and drawing the structures of the compounds. I am also very grateful to Dr. Kazuo Nagai for his critical reading of this manuscript.
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