positive regulation of interleukin-18-mediated signaling pathway
Definition
Target type: biologicalprocess
Any process that activates or increases the frequency, rate or extent of interleukin-18-mediated signaling pathway. [GOC:obol]
Positive regulation of interleukin-18 (IL-18)-mediated signaling pathway is a crucial biological process involved in the activation and modulation of immune responses. IL-18, a pro-inflammatory cytokine, plays a critical role in the initiation and amplification of inflammatory cascades, primarily by inducing the production of interferon-gamma (IFN-γ) and other pro-inflammatory mediators.
The positive regulation of IL-18-mediated signaling pathway involves a complex interplay of signaling molecules and cellular events. It begins with the binding of IL-18 to its receptor, IL-18Rα, expressed on the surface of immune cells, such as T lymphocytes, natural killer (NK) cells, and macrophages. This binding event triggers the recruitment of the IL-18Rβ subunit, forming a heterodimer complex that initiates downstream signaling cascades.
The activated IL-18R complex recruits adaptor proteins, such as MyD88 and TRAF6, which in turn activate downstream signaling pathways, including the NF-κB pathway and the MAPK pathway. NF-κB activation leads to the transcription of pro-inflammatory genes, including TNF-α, IL-1β, and IL-6, while MAPK activation promotes the production of chemokines and other inflammatory mediators.
The IL-18 signaling pathway also involves the activation of the caspase-1 enzyme, which processes the precursor form of IL-18 into its active mature form. Mature IL-18 is then secreted from cells, further amplifying the inflammatory response.
Positive regulation of IL-18 signaling can be influenced by various factors, including:
- **Inflammation:** Inflammatory stimuli, such as bacterial or viral infections, can induce the expression of IL-18 and its receptor, enhancing the sensitivity of cells to IL-18.
- **Cytokines:** Other pro-inflammatory cytokines, such as TNF-α and IL-1β, can synergistically enhance IL-18-mediated signaling.
- **Toll-like receptor (TLR) activation:** TLRs recognize pathogen-associated molecular patterns (PAMPs), leading to the activation of signaling pathways that upregulate IL-18 production.
- **Microbiota:** The composition of the gut microbiota can influence IL-18 production and signaling.
- **Genetic factors:** Polymorphisms in IL-18 and IL-18R genes can affect the responsiveness to IL-18.
The positive regulation of IL-18-mediated signaling pathway is essential for mounting appropriate immune responses against pathogens and for maintaining tissue homeostasis. However, dysregulation of this pathway can contribute to the development of chronic inflammatory diseases, such as inflammatory bowel disease, rheumatoid arthritis, and sepsis.
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Proteins (1)
| Protein | Definition | Taxonomy |
|---|---|---|
| Caspase-4 | A caspase-4 that is encoded in the genome of human. [PRO:WCB, UniProtKB:P49662] | Homo sapiens (human) |
Compounds (13)
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| 4-biphenylylacetic acid | biphenyl-4-ylacetic acid : A monocarboxylic acid in which one of the alpha-hydrogens is substituted by a biphenyl-4-yl group. An active metabolite of fenbufen, it is used as a topical medicine to treat muscle inflammation and arthritis. | biphenyls; monocarboxylic acid | non-steroidal anti-inflammatory drug |
| fenbufen | fenbufen: structure; RN given refers to parent cpd | 4-oxo monocarboxylic acid; biphenyls | non-steroidal anti-inflammatory drug |
| ibuprofen | Midol: combination of cinnamedrine, phenacetin, aspirin & caffeine | monocarboxylic acid | antipyretic; cyclooxygenase 1 inhibitor; cyclooxygenase 2 inhibitor; drug allergen; environmental contaminant; geroprotector; non-narcotic analgesic; non-steroidal anti-inflammatory drug; radical scavenger; xenobiotic |
| indoprofen | indoprofen : A monocarboxylic acid that is propionic acid in which one of the hydrogens at position 2 is substituted by a 4-(1-oxo-1,3-dihydroisoindol-2-yl)phenyl group. Initially used as an anti-inflammatory and analgesic, it was withdrawn from the market due to causing severe gastrointestinal bleeding. It has been subsequently found to increase production of the survival motor neuron protein. Indoprofen: A drug that has analgesic and anti-inflammatory properties. Following reports of adverse reactions including reports of carcinogenicity in animal studies it was withdrawn from the market worldwide. (From Martindale, The Extra Pharmacopoeia, 30th ed, p21) | gamma-lactam; isoindoles; monocarboxylic acid | EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor; non-narcotic analgesic; non-steroidal anti-inflammatory drug |
| ketoprofen | ketoprofen : An oxo monocarboxylic acid that consists of propionic acid substituted by a 3-benzoylphenyl group at position 2. Ketoprofen: An IBUPROFEN-type anti-inflammatory analgesic and antipyretic. It is used in the treatment of rheumatoid arthritis and osteoarthritis. | benzophenones; oxo monocarboxylic acid | antipyretic; drug allergen; EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor; environmental contaminant; non-steroidal anti-inflammatory drug; xenobiotic |
| ketorolac | 5-benzoyl-2,3-dihydro-1H-pyrrolizine-1-carboxylic acid : A member of the class of pyrrolizines that is 2,3-dihydro-1H-pyrrolizine which is substituted at positions 1 and 5 by carboxy and benzoyl groups, respectively. ketorolac : A racemate comprising equimolar amounts of (R)-(+)- and (S)-(-)-5-benzoyl-2,3-dihydro-1H-pyrrolizine-1-carboxylic acid. While only the (S)-(-) enantiomer is a COX1 and COX2 inhibitor, the (R)-(+) enantiomer exhibits potent analgesic activity. A non-steroidal anti-inflammatory drug, ketorolac is mainly used (generally as the tromethamine salt) for its potent analgesic properties in the short-term management of post-operative pain, and in eye drops to relieve the ocular itching associated with seasonal allergic conjunctivitis. It was withdrawn from the market in many countries in 1993 following association with haemorrhage and renal failure. Ketorolac: A pyrrolizine carboxylic acid derivative structurally related to INDOMETHACIN. It is an NSAID and is used principally for its analgesic activity. (From Martindale The Extra Pharmacopoeia, 31st ed) | amino acid; aromatic ketone; monocarboxylic acid; pyrrolizines; racemate | analgesic; cyclooxygenase 1 inhibitor; cyclooxygenase 2 inhibitor; non-steroidal anti-inflammatory drug |
| tiaprofenic acid | tiaprofenic acid : An aromatic ketone that is thiophene substituted at C-2 by benzoyl and at C-4 by a 1-carboxyethyl group. tiaprofenic acid: RN given refers to parent cpd; structure | aromatic ketone; monocarboxylic acid; thiophenes | drug allergen; non-steroidal anti-inflammatory drug |
| n-methylisatin | N-methylisatin: structure given in first source | ||
| naproxen | naproxen : A methoxynaphthalene that is 2-methoxynaphthalene substituted by a carboxy ethyl group at position 6. Naproxen is a non-steroidal anti-inflammatory drug commonly used for the reduction of pain, fever, inflammation and stiffness caused by conditions such as osteoarthritis, kidney stones, rheumatoid arthritis, psoriatic arthritis, gout, ankylosing spondylitis, menstrual cramps, tendinitis, bursitis, and for the treatment of primary dysmenorrhea. It works by inhibiting both the COX-1 and COX-2 enzymes. Naproxen: An anti-inflammatory agent with analgesic and antipyretic properties. Both the acid and its sodium salt are used in the treatment of rheumatoid arthritis and other rheumatic or musculoskeletal disorders, dysmenorrhea, and acute gout. | methoxynaphthalene; monocarboxylic acid | antipyretic; cyclooxygenase 1 inhibitor; cyclooxygenase 2 inhibitor; drug allergen; environmental contaminant; gout suppressant; non-narcotic analgesic; non-steroidal anti-inflammatory drug; xenobiotic |
| 5-Nitroisatin | indoles | anticoronaviral agent | |
| 6-(3,5-difluoroanilino)-9-ethyl-2-purinecarbonitrile | 6-aminopurines | ||
| grassystatin a | grassystatin A: isolated from a cyanobacterium, identified as Lyngbya cf.; structure in first source | ||
| MK-8353 | MK-8353 : A member of the class of indazoles that is 1H-indazole substituted by a 6-(propan-2-yloxy)pyridin-3-yl group at position 3 and by a {[(3S)-3-(methylsulfanyl)-1-(2-{4-[4-(1-methyl-1H-1,2,4-triazol-3-yl)phenyl]-3,6-dihydropyridin-1(2H)-yl}-2-oxoethyl)pyrrolidin-3-yl]carbonyl}amino group at position 5. It is a potent and selective inhibitor of ERK1 and ERK2 in vitro (IC50 values of 23.0 nM and 8.8 nM, respectively). The drug is being developed by Merck Sharp & Dohme and is currently in clinical development for the treatment of advanced/metastatic solid tumors. MK-8353: ERK inhibitor used in oncology | aromatic ether; dihydropyridine; indazoles; methyl sulfide; N-alkylpyrrolidine; pyridines; pyrrolidinecarboxamide; secondary carboxamide; tertiary carboxamide; triazoles | antineoplastic agent; apoptosis inducer; EC 2.7.11.24 (mitogen-activated protein kinase) inhibitor |