Target type: biologicalprocess
Any process that activates or increases the frequency, rate or extent of neutrophil degranulation. [ISBN:0781735149]
Positive regulation of neutrophil degranulation is a complex process that involves a cascade of signaling events leading to the release of cytotoxic and antimicrobial granules from neutrophils. These granules contain a diverse array of bioactive molecules, including proteases, antimicrobial peptides, and reactive oxygen species, which are crucial for the elimination of pathogens and the resolution of inflammation.
The process is initiated by the recognition of pathogens or inflammatory signals by receptors on the neutrophil surface, such as toll-like receptors (TLRs), Fc receptors, and complement receptors. Upon activation, these receptors trigger downstream signaling pathways, including the activation of protein kinases, such as protein kinase C (PKC) and mitogen-activated protein kinases (MAPKs).
Activation of these signaling pathways leads to the mobilization of intracellular calcium, which triggers a series of events culminating in the fusion of granules with the plasma membrane, releasing their contents into the extracellular space. This process is tightly regulated by a complex interplay of signaling molecules, including GTPases, SNARE proteins, and cytoskeletal components.
Specific molecular mechanisms involved in the positive regulation of neutrophil degranulation include:
* **Activation of PKC and MAPKs:** These kinases phosphorylate and activate downstream signaling molecules, including the small GTPase Rac, which is essential for actin polymerization and cytoskeletal reorganization.
* **Calcium signaling:** Intracellular calcium plays a critical role in the activation of calpain proteases, which are involved in the cleavage of SNARE proteins, facilitating granule fusion.
* **GTPases:** GTPases, such as Rac and Rho, are involved in the regulation of cytoskeletal rearrangements, which are necessary for granule translocation and fusion.
* **SNARE proteins:** SNARE proteins are involved in the docking and fusion of granules with the plasma membrane. They mediate the interaction between the granule membrane and the plasma membrane, facilitating the release of granule contents.
The positive regulation of neutrophil degranulation is crucial for the host defense against pathogens and the resolution of inflammation. However, uncontrolled degranulation can contribute to tissue damage and inflammatory pathologies. Therefore, tight regulation of this process is essential for maintaining immune homeostasis.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Platelet-activating factor receptor | A mammalian-type platelet-activating factor receptor that is encoded in the genome of human. [PRO:WCB, UniProtKB:P25105] | Homo sapiens (human) |
| Integrin beta-2 | An integrin beta-2 that is encoded in the genome of human. [PRO:WCB, UniProtKB:P05107] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| indole | indole; polycyclic heteroarene | Escherichia coli metabolite | |
| brotizolam | brotizolam: structure | organic molecular entity | |
| cilostamide | cilostamide: selective inhibitor of cyclic AMP phosphodiesterase & platelet aggregation; structure | quinolines | |
| clotrimazole | conazole antifungal drug; imidazole antifungal drug; imidazoles; monochlorobenzenes | antiinfective agent; environmental contaminant; xenobiotic | |
| dephostatin | dephostatin: from Streptomyces sp. MJ742-NF5; structure given in first source | ||
| juglone | juglone : A hydroxy-1,4-naphthoquinone that is 1,4-naphthoquinone in which the hydrogen at position 5 has been replaced by a hydroxy group. A plant-derived 1,4-naphthoquinone with confirmed antibacterial and antitumor activities. juglone: structure | hydroxy-1,4-naphthoquinone | geroprotector; herbicide; reactive oxygen species generator |
| loratadine | loratadine : A benzocycloheptapyridine that is 6,11-dihydro-5H-benzo[5,6]cyclohepta[1,2-b]pyridine substituted by a chloro group at position 8 and a 1-(ethoxycarbonyl)piperidin-4-ylidene group at position 11. It is a H1-receptor antagonist commonly employed in the treatment of allergic disorders. Loratadine: A second-generation histamine H1 receptor antagonist used in the treatment of allergic rhinitis and urticaria. Unlike most classical antihistamines (HISTAMINE H1 ANTAGONISTS) it lacks central nervous system depressing effects such as drowsiness. | benzocycloheptapyridine; ethyl ester; N-acylpiperidine; organochlorine compound; tertiary carboxamide | anti-allergic agent; cholinergic antagonist; geroprotector; H1-receptor antagonist |
| mesalamine | mesalamine : A monohydroxybenzoic acid that is salicylic acid substituted by an amino group at the 5-position. Mesalamine: An anti-inflammatory agent, structurally related to the SALICYLATES, which is active in INFLAMMATORY BOWEL DISEASE. It is considered to be the active moiety of SULPHASALAZINE. (From Martindale, The Extra Pharmacopoeia, 30th ed) | amino acid; aromatic amine; monocarboxylic acid; monohydroxybenzoic acid; phenols | non-steroidal anti-inflammatory drug |
| etoposide phosphate | |||
| nifedipine | Nifedipine: A potent vasodilator agent with calcium antagonistic action. It is a useful anti-anginal agent that also lowers blood pressure. | C-nitro compound; dihydropyridine; methyl ester | calcium channel blocker; human metabolite; tocolytic agent; vasodilator agent |
| 1,2,5,8-tetrahydroxy anthraquinone | 1,2,5,8-tetrahydroxy anthraquinone: structure in first source quinalizarin : A tetrahydroxyanthraquinone having the four hydroxy groups at the 1-, 2-, 5- and 8-positions. | tetrahydroxyanthraquinone | EC 2.7.11.1 (non-specific serine/threonine protein kinase) inhibitor |
| purpurin | purpurin : A trihydroxyanthraquinone derived from anthracene by substitution with oxo groups at C-9 and C-10 and with hydroxy groups at C-1, C-2 and C-4. purpurin: from Rubiaceae plants; structure in first source | trihydroxyanthraquinone | biological pigment; histological dye; plant metabolite |
| suramin sodium | suramin sodium : An organic sodium salt that is the hexasodium salt of suramin. It is an FDA approved drug for African sleeping sickness and river blindness. | organic sodium salt | angiogenesis inhibitor; antinematodal drug; antineoplastic agent; apoptosis inhibitor; EC 2.7.11.13 (protein kinase C) inhibitor; GABA antagonist; GABA-gated chloride channel antagonist; purinergic receptor P2 antagonist; ryanodine receptor agonist; trypanocidal drug |
| lithocholic acid | lithocholate : A bile acid anion that is the conjugate base of lithocholic acid. lithocholic acid : A monohydroxy-5beta-cholanic acid with a alpha-hydroxy substituent at position 3. It is a bile acid obtained from chenodeoxycholic acid by bacterial action. Lithocholic Acid: A bile acid formed from chenodeoxycholate by bacterial action, usually conjugated with glycine or taurine. It acts as a detergent to solubilize fats for absorption and is itself absorbed. It is used as cholagogue and choleretic. | bile acid; C24-steroid; monohydroxy-5beta-cholanic acid | geroprotector; human metabolite; mouse metabolite |
| chrysophanic acid | chrysophanic acid: RN given refers to parent cpd; structure in Merck, 9th ed, #2260 chrysophanol : A trihydroxyanthraquinone that is chrysazin with a methyl substituent at C-3. It has been isolated from Aloe vera and exhibits antiviral and anti-inflammatory activity. | dihydroxyanthraquinone | anti-inflammatory agent; antiviral agent; plant metabolite |
| 1,4-benzodioxan | 1,4-benzodioxan: structure in first source | ||
| 1-methylindole | 1-methylindole: SKATOLE refers to 3-methylindole; RN given refers to parent cpd; structure methylindole : Any member of the class of indoles carrying one or more methyl substituents. | ||
| ethidium bromide | organic bromide salt | geroprotector; intercalator; trypanocidal drug | |
| daunorubicin | anthracycline : Anthracyclines are polyketides that have a tetrahydronaphthacenedione ring structure attached by a glycosidic linkage to the amino sugar daunosamine. daunorubicin : A natural product found in Actinomadura roseola. Daunorubicin: A very toxic anthracycline aminoglycoside antineoplastic isolated from Streptomyces peucetius and others, used in treatment of LEUKEMIA and other NEOPLASMS. | aminoglycoside antibiotic; anthracycline; p-quinones; tetracenequinones | antineoplastic agent; bacterial metabolite |
| lovastatin | lovastatin : A fatty acid ester that is mevastatin carrying an additional methyl group on the carbobicyclic skeleton. It is used in as an anticholesteremic drug and has been found in fungal species such as Aspergillus terreus and Pleurotus ostreatus (oyster mushroom). Lovastatin: A fungal metabolite isolated from cultures of Aspergillus terreus. The compound is a potent anticholesteremic agent. It inhibits 3-hydroxy-3-methylglutaryl coenzyme A reductase (HYDROXYMETHYLGLUTARYL COA REDUCTASES), which is the rate-limiting enzyme in cholesterol biosynthesis. It also stimulates the production of low-density lipoprotein receptors in the liver. | delta-lactone; fatty acid ester; hexahydronaphthalenes; polyketide; statin (naturally occurring) | anticholesteremic drug; antineoplastic agent; Aspergillus metabolite; prodrug |
| sch 37370 | N-acetyldesloratadine: dual antagonist of platelet-activating factor and histamine | ||
| ro 24-4736 | Ro 24-4736: structure given in first source; platelet activating factor antagonist | ||
| daunorubicin hydrochloride | anthracycline | ||
| chlorfenethazine | chlorfenethazine: RN given refers to parent cpd; synonym elroquil refers to HCl; structure | phenothiazines | |
| web 2086 | WEB 2086: structure given in first source; PAF antagonist | organonitrogen heterocyclic compound; organosulfur heterocyclic compound | |
| pacein | orcein : A variable mixture of several compounds isolated from lichens, the eight most abundant being alpha-aminoorcein, alpha-hydroxyorcein, beta-aminoorcein, gamma-aminoorcein, beta-hydroxyorcein, gamma-hydroxyorcein, beta-aminoorceimine and beta-aminoorceimine (all are phenoxazine-based). It is used for the demonstration of elastic fibres as well as to stain the rough endoplasmic reticulum of hepatitis B infected liver cells. pacein : A member of the class of benzofurans that is dibenzo[b,d]furan-3,7-dione bearing two methyl substituents at positions 1 and 9 as well as two 2,4-dihydroxy-6-methylanilino substituents at positions 2 and 8. PAcein: structure | ||
| cv 3988 | CV 3988: platelet activating factor antagonist; structure given in first source | ||
| 1-hexadecyl-2-acetyl-glycero-3-phosphocholine | 2-O-acetyl-1-O-hexadecyl-sn-glycero-3-phosphocholine : A 2-acetyl-1-alkyl-sn-glycero-3-phosphocholine betaine which has hexadecyl as the alkyl group. PAF is a potent phospholipid activator and mediator of many leukocyte functions, including platelet aggregation, inflammation, and anaphylaxis. Platelet Activating Factor: A phospholipid derivative formed by PLATELETS; BASOPHILS; NEUTROPHILS; MONOCYTES; and MACROPHAGES. It is a potent platelet aggregating agent and inducer of systemic anaphylactic symptoms, including HYPOTENSION; THROMBOCYTOPENIA; NEUTROPENIA; and BRONCHOCONSTRICTION. | 2-acetyl-1-alkyl-sn-glycero-3-phosphocholine | antihypertensive agent; beta-adrenergic antagonist; bronchoconstrictor agent; hematologic agent; vasodilator agent |
| mk 287 | MK 287: RN given refers to the trans-(-)-isomer L-680573; L-680574 is an optical enantiomer; L-668750 is the racemic mixture; structure given in first source | ||
| rupatadine | rupatadine: structure given in first source; RN given refers to trihydrochloride | benzocycloheptapyridine | |
| 2-bromohippuric acid | |||
| sdz 64-412 | SDZ 64-412: structure given in first source; PAF antagonist | ||
| doxorubicin hydrochloride | anthracycline | ||
| 2-thiophenecarboxylic acid 2-(1,3-dioxo-2-isoindolyl)ethyl ester | phthalimides | ||
| benzotript | benzotript: anti-gastrinic; active group is amide; structure | ||
| suramin sodium | suramin(6-) : An organosulfate oxoanion that is the hexanion of suramin resulting from the deprotonation of the six sulfo groups; major species at pH 7.3. | organosulfate oxoanion | |
| gw-5074 | |||
| nf 449 | |||
| ginkgolide b | |||
| ro 24-0238 | Ro 24-0238: PAF antagonist | ||
| l 652731 | |||
| birt 377 | |||
| lexipafant | lexipafant: an imidazolyl derivative which forms part of a fused heterocyclic system | ||
| abt 299 | ABT 299: converted in vivo to A-85783.0; a platelet activating factor antagonist; structure in first source | ||
| a 286982 | A 286982: inhibits the interaction between leukocyte function-associated antigen-1 and intracellular adhesion molecule-1; structure in first source | ||
| orvepitant | |||
| bio 1211 | BIO 1211: integrin alpha4beta1 inhibitor; structure in first source | ||
| sar 1118 | lifitegrast : An N-acyl-L-alpha-amino acid obtained by formal condensation of the carboxy group of N-[2-(1-benzofuran-6-carbonyl)]-5,7-dichloro-1,2,3,4-tetrahydroisoquinoline-6-carboxylic acid with the amino group of 3-(methanesulfonyl)-L-phenylalanine. Used for treatment of keratoconjunctivitis sicca (dry eye syndrome). lifitegrast: An LFA-1 (LYMPHOCYTE FUNCTION-ASSOCIATED ANTIGEN-1) antagonist that is used in the treatment of DRY EYE SYNDROMES. | 1-benzofurans; isoquinolines; L-phenylalanine derivative; N-acyl-L-alpha-amino acid; sulfone | anti-inflammatory drug; lymphocyte function-associated antigen-1 antagonist |