non-canonical inflammasome complex assembly
Definition
Target type: biologicalprocess
The aggregation, arrangement and bonding together of a set of components to form a non-canonical inflammasome complex. [PMID:27291964]
Non-canonical inflammasomes diverge from the canonical pathway in their assembly and activation mechanisms. While canonical inflammasomes primarily rely on caspase-1 activation for interleukin-1β (IL-1β) and IL-18 processing, non-canonical inflammasomes employ caspase-4, -5, or -11 in humans (caspase-11 in rodents) as the central protease. The initiation of non-canonical inflammasome activation often involves the direct detection of intracellular pathogens or danger signals, bypassing the need for adaptor proteins like ASC.
One notable characteristic of non-canonical inflammasomes is their reliance on the recognition of specific pathogen-associated molecular patterns (PAMPs) or danger-associated molecular patterns (DAMPs). For instance, caspase-4/5/11 directly binds to lipopolysaccharide (LPS) from Gram-negative bacteria, triggering their activation. This interaction disrupts the integrity of the outer membrane of the bacteria, releasing LPS into the cytoplasm.
Once activated, caspase-4/5/11 activates the gasdermin D protein, a pore-forming molecule. Gasdermin D oligomerizes and inserts itself into the cell membrane, forming large pores. These pores allow for the release of inflammatory cytokines, including IL-1β and IL-18, as well as other cellular components.
In addition to LPS, other triggers for non-canonical inflammasome activation include:
* Viral double-stranded RNA (dsRNA) through the interaction with the retinoic acid-inducible gene I (RIG-I) receptor.
* DNA through the cyclic GMP-AMP synthase (cGAS) pathway.
* Crystalline structures like monosodium urate (MSU) crystals, which are found in gout.
The activation of non-canonical inflammasomes results in the release of inflammatory cytokines and the induction of pyroptosis, a form of programmed cell death characterized by cell swelling and membrane rupture. These events contribute to the host's defense against infections and inflammation.
Overall, the non-canonical inflammasome pathway represents a distinct mechanism of innate immune defense, utilizing a unique set of sensors and signaling pathways to detect and respond to intracellular threats.'
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Proteins (2)
| Protein | Definition | Taxonomy |
|---|---|---|
| Caspase-4 | A caspase-4 that is encoded in the genome of human. [PRO:WCB, UniProtKB:P49662] | Homo sapiens (human) |
| Nuclear receptor subfamily 4 group A member 1 | A nuclear receptor subfamily 4 immunity group A member 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P22736] | Homo sapiens (human) |
Compounds (18)
| 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 | ||
| celastrol | monocarboxylic acid; pentacyclic triterpenoid | anti-inflammatory drug; antineoplastic agent; antioxidant; EC 5.99.1.3 [DNA topoisomerase (ATP-hydrolysing)] inhibitor; Hsp90 inhibitor; metabolite | |
| 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 |
| celastrol methyl ester | celastrol methyl ester: isolated from Tripterygium wilfordii; potent inhibitory activity on both Kir2.1 and ERG1 potassium channels, leading to LONG QT SYNDROME | carboxylic ester | |
| alitretinoin | Alitretinoin: A retinoid that is used for the treatment of chronic hand ECZEMA unresponsive to topical CORTICOSTEROIDS. It is also used to treat cutaneous lesions associated with AIDS-related KAPOSI SARCOMA. | retinoic acid | antineoplastic agent; keratolytic drug; metabolite; retinoid X receptor agonist |
| 5-Nitroisatin | indoles | anticoronaviral agent | |
| triptohypol C | triptohypol C : A pentacyclic triterpenoid with formula C29H40O4, originally isolated from the root bark of Tripterygium regelii. | benzenediols; monocarboxylic acid; pentacyclic triterpenoid | apoptosis inducer; plant metabolite |
| cytosporone b | cytosporone B: a Nur77 agonist; structure in first source | aromatic ketone | |
| 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 |