Macrophages specializing in tissue repair or associated with a Th2-type immune response are more permissive to infection with leishmania, since their defense mechanisms are not very efficient in eliminating the parasite and can contribute to its persistence (Lee et al. 2018).
View original pathway at Reactome.
Buxbaum LU.; ''Leishmania mexicana infection induces IgG to parasite surface glycoinositol phospholipids that can induce IL-10 in mice and humans.''; PubMedEurope PMCScholia
Simpson RE, Ciruela A, Cooper DM.; ''The role of calmodulin recruitment in Ca2+ stimulation of adenylyl cyclase type 8.''; PubMedEurope PMCScholia
Zhang JY, Nawoschik S, Kowal D, Smith D, Spangler T, Ochalski R, Schechter L, Dunlop J.; ''Characterization of the 5-HT6 receptor coupled to Ca2+ signaling using an enabling chimeric G-protein.''; PubMedEurope PMCScholia
Asadullah K, Sterry W, Volk HD.; ''Interleukin-10 therapy--review of a new approach.''; PubMedEurope PMCScholia
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Wenzel-Seifert K, Liu HY, Seifert R.; ''Similarities and differences in the coupling of human beta1- and beta2-adrenoceptors to Gs(alpha) splice variants.''; PubMedEurope PMCScholia
Etzerodt A, Rasmussen MR, Svendsen P, Chalaris A, Schwarz J, Galea I, Møller HJ, Moestrup SK.; ''Structural basis for inflammation-driven shedding of CD163 ectodomain and tumor necrosis factor-α in macrophages.''; PubMedEurope PMCScholia
Tsang E, Giannetti AM, Shaw D, Dinh M, Tse JK, Gandhi S, Ho H, Wang S, Papp E, Bradshaw JM.; ''Molecular mechanism of the Syk activation switch.''; PubMedEurope PMCScholia
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Huang ZY, Barreda DR, Worth RG, Indik ZK, Kim MK, Chien P, Schreiber AD.; ''Differential kinase requirements in human and mouse Fc-gamma receptor phagocytosis and endocytosis.''; PubMedEurope PMCScholia
Fan H, Turck CW, Derynck R.; ''Characterization of growth factor-induced serine phosphorylation of tumor necrosis factor-alpha converting enzyme and of an alternatively translated polypeptide.''; PubMedEurope PMCScholia
Matsuda M, Paterson HF, Rodriguez R, Fensome AC, Ellis MV, Swann K, Katan M.; ''Real time fluorescence imaging of PLC gamma translocation and its interaction with the epidermal growth factor receptor.''; PubMedEurope PMCScholia
Crowley MT, Costello PS, Fitzer-Attas CJ, Turner M, Meng F, Lowell C, Tybulewicz VL, DeFranco AL.; ''A critical role for Syk in signal transduction and phagocytosis mediated by Fcgamma receptors on macrophages.''; PubMedEurope PMCScholia
Cooper JA, Hill SJ, Alexander SP, Rubin PC, Horn EH.; ''Adenosine receptor-induced cyclic AMP generation and inhibition of 5-hydroxytryptamine release in human platelets.''; PubMedEurope PMCScholia
Matsuda M, Park JG, Wang DC, Hunter S, Chien P, Schreiber AD.; ''Abrogation of the Fc gamma receptor IIA-mediated phagocytic signal by stem-loop Syk antisense oligonucleotides.''; PubMedEurope PMCScholia
Heise CE, O'Dowd BF, Figueroa DJ, Sawyer N, Nguyen T, Im DS, Stocco R, Bellefeuille JN, Abramovitz M, Cheng R, Williams DL, Zeng Z, Liu Q, Ma L, Clements MK, Coulombe N, Liu Y, Austin CP, George SR, O'Neill GP, Metters KM, Lynch KR, Evans JF.; ''Characterization of the human cysteinyl leukotriene 2 receptor.''; PubMedEurope PMCScholia
Droste A, Sorg C, Högger P.; ''Shedding of CD163, a novel regulatory mechanism for a member of the scavenger receptor cysteine-rich family.''; PubMedEurope PMCScholia
Kiener PA, Rankin BM, Burkhardt AL, Schieven GL, Gilliland LK, Rowley RB, Bolen JB, Ledbetter JA.; ''Cross-linking of Fc gamma receptor I (Fc gamma RI) and receptor II (Fc gamma RII) on monocytic cells activates a signal transduction pathway common to both Fc receptors that involves the stimulation of p72 Syk protein tyrosine kinase.''; PubMedEurope PMCScholia
Gechtman Z, Alonso JL, Raab G, Ingber DE, Klagsbrun M.; ''The shedding of membrane-anchored heparin-binding epidermal-like growth factor is regulated by the Raf/mitogen-activated protein kinase cascade and by cell adhesion and spreading.''; PubMedEurope PMCScholia
Lynch KR, O'Neill GP, Liu Q, Im DS, Sawyer N, Metters KM, Coulombe N, Abramovitz M, Figueroa DJ, Zeng Z, Connolly BM, Bai C, Austin CP, Chateauneuf A, Stocco R, Greig GM, Kargman S, Hooks SB, Hosfield E, Williams DL, Ford-Hutchinson AW, Caskey CT, Evans JF.; ''Characterization of the human cysteinyl leukotriene CysLT1 receptor.''; PubMedEurope PMCScholia
Kelly EK, Wang L, Ivashkiv LB.; ''Calcium-activated pathways and oxidative burst mediate zymosan-induced signaling and IL-10 production in human macrophages.''; PubMedEurope PMCScholia
Linden J, Thai T, Figler H, Jin X, Robeva AS.; ''Characterization of human A(2B) adenosine receptors: radioligand binding, western blotting, and coupling to G(q) in human embryonic kidney 293 cells and HMC-1 mast cells.''; PubMedEurope PMCScholia
Timmermann M, Buck F, Sorg C, Högger P.; ''Interaction of soluble CD163 with activated T lymphocytes involves its association with non-muscle myosin heavy chain type A.''; PubMedEurope PMCScholia
Carpenter G, Ji Q.; ''Phospholipase C-gamma as a signal-transducing element.''; PubMedEurope PMCScholia
Maskos K, Fernandez-Catalan C, Huber R, Bourenkov GP, Bartunik H, Ellestad GA, Reddy P, Wolfson MF, Rauch CT, Castner BJ, Davis R, Clarke HR, Petersen M, Fitzner JN, Cerretti DP, March CJ, Paxton RJ, Black RA, Bode W.; ''Crystal structure of the catalytic domain of human tumor necrosis factor-alpha-converting enzyme.''; PubMedEurope PMCScholia
Kozasa T, Itoh H, Tsukamoto T, Kaziro Y.; ''Isolation and characterization of the human Gs alpha gene.''; PubMedEurope PMCScholia
Martin AL, Steurer MA, Aronstam RS.; ''Constitutive Activity among Orphan Class-A G Protein Coupled Receptors.''; PubMedEurope PMCScholia
Tesmer JJ, Sunahara RK, Gilman AG, Sprang SR.; ''Crystal structure of the catalytic domains of adenylyl cyclase in a complex with Gsalpha.GTPgammaS.''; PubMedEurope PMCScholia
Leduc R, Molloy SS, Thorne BA, Thomas G.; ''Activation of human furin precursor processing endoprotease occurs by an intramolecular autoproteolytic cleavage.''; PubMedEurope PMCScholia
Law CL, Chandran KA, Sidorenko SP, Clark EA.; ''Phospholipase C-gamma1 interacts with conserved phosphotyrosyl residues in the linker region of Syk and is a substrate for Syk.''; PubMedEurope PMCScholia
Peterfreund RA, MacCollin M, Gusella J, Fink JS.; ''Characterization and expression of the human A2a adenosine receptor gene.''; PubMedEurope PMCScholia
Wong E, Maretzky T, Peleg Y, Blobel CP, Sagi I.; ''The Functional Maturation of A Disintegrin and Metalloproteinase (ADAM) 9, 10, and 17 Requires Processing at a Newly Identified Proprotein Convertase (PC) Cleavage Site.''; PubMedEurope PMCScholia
Yang R, Lin Q, Gao HB, Zhang P.; ''Stress-related hormone norepinephrine induces interleukin-6 expression in GES-1 cells.''; PubMedEurope PMCScholia
Padigel UM, Farrell JP.; ''Control of infection with Leishmania major in susceptible BALB/c mice lacking the common gamma-chain for FcR is associated with reduced production of IL-10 and TGF-beta by parasitized cells.''; PubMedEurope PMCScholia
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Strzelecka A, Kwiatkowska K, Sobota A.; ''Tyrosine phosphorylation and Fcgamma receptor-mediated phagocytosis.''; PubMedEurope PMCScholia
Sarau HM, Ames RS, Chambers J, Ellis C, Elshourbagy N, Foley JJ, Schmidt DB, Muccitelli RM, Jenkins O, Murdock PR, Herrity NC, Halsey W, Sathe G, Muir AI, Nuthulaganti P, Dytko GM, Buckley PT, Wilson S, Bergsma DJ, Hay DW.; ''Identification, molecular cloning, expression, and characterization of a cysteinyl leukotriene receptor.''; PubMedEurope PMCScholia
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Chu N, Thomas BN, Patel SR, Buxbaum LU.; ''IgG1 is pathogenic in Leishmania mexicana infection.''; PubMedEurope PMCScholia
Baker LP, Nielsen MD, Impey S, Metcalf MA, Poser SW, Chan G, Obrietan K, Hamblin MW, Storm DR.; ''Stimulation of type 1 and type 8 Ca2+/calmodulin-sensitive adenylyl cyclases by the Gs-coupled 5-hydroxytryptamine subtype 5-HT7A receptor.''; PubMedEurope PMCScholia
Gullingsrud J, Kim C, Taylor SS, McCammon JA.; ''Dynamic binding of PKA regulatory subunit RI alpha.''; PubMedEurope PMCScholia
Mitsuhashi M, Mitsuhashi T, Payan DG.; ''Multiple signaling pathways of histamine H2 receptors. Identification of an H2 receptor-dependent Ca2+ mobilization pathway in human HL-60 promyelocytic leukemia cells.''; PubMedEurope PMCScholia
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James MA, Lu Y, Liu Y, Vikis HG, You M.; ''RGS17, an overexpressed gene in human lung and prostate cancer, induces tumor cell proliferation through the cyclic AMP-PKA-CREB pathway.''; PubMedEurope PMCScholia
Di Pasquale G, Stacey SN.; ''Adeno-associated virus Rep78 protein interacts with protein kinase A and its homolog PRKX and inhibits CREB-dependent transcriptional activation.''; PubMedEurope PMCScholia
Endres K, Anders A, Kojro E, Gilbert S, Fahrenholz F, Postina R.; ''Tumor necrosis factor-alpha converting enzyme is processed by proprotein-convertases to its mature form which is degraded upon phorbol ester stimulation.''; PubMedEurope PMCScholia
Lupher ML, Rao N, Lill NL, Andoniou CE, Miyake S, Clark EA, Druker B, Band H.; ''Cbl-mediated negative regulation of the Syk tyrosine kinase. A critical role for Cbl phosphotyrosine-binding domain binding to Syk phosphotyrosine 323.''; PubMedEurope PMCScholia
Díaz-Rodríguez E, Montero JC, Esparís-Ogando A, Yuste L, Pandiella A.; ''Extracellular signal-regulated kinase phosphorylates tumor necrosis factor alpha-converting enzyme at threonine 735: a potential role in regulated shedding.''; PubMedEurope PMCScholia
Etzerodt A, Maniecki MB, Møller K, Møller HJ, Moestrup SK.; ''Tumor necrosis factor α-converting enzyme (TACE/ADAM17) mediates ectodomain shedding of the scavenger receptor CD163.''; PubMedEurope PMCScholia
Suzuki T, Kono H, Hirose N, Okada M, Yamamoto T, Yamamoto K, Honda Z.; ''Differential involvement of Src family kinases in Fc gamma receptor-mediated phagocytosis.''; PubMedEurope PMCScholia
Chen TY, Illing M, Molday LL, Hsu YT, Yau KW, Molday RS.; ''Subunit 2 (or beta) of retinal rod cGMP-gated cation channel is a component of the 240-kDa channel-associated protein and mediates Ca(2+)-calmodulin modulation.''; PubMedEurope PMCScholia
Lambert NA.; ''Dissociation of heterotrimeric g proteins in cells.''; PubMedEurope PMCScholia
Kim YJ, Sekiya F, Poulin B, Bae YS, Rhee SG.; ''Mechanism of B-cell receptor-induced phosphorylation and activation of phospholipase C-gamma2.''; PubMedEurope PMCScholia
Kim MJ, Kim E, Ryu SH, Suh PG.; ''The mechanism of phospholipase C-gamma1 regulation.''; PubMedEurope PMCScholia
Li W, Yu ZX, Kotin RM.; ''Profiles of PrKX expression in developmental mouse embryo and human tissues.''; PubMedEurope PMCScholia
Eskdale J, Kube D, Tesch H, Gallagher G.; ''Mapping of the human IL10 gene and further characterization of the 5' flanking sequence.''; PubMedEurope PMCScholia
Burger R.; ''Impact of interleukin-6 in hematological malignancies.''; PubMedEurope PMCScholia
Wickham S, West MB, Cook PF, Hanigan MH.; ''Gamma-glutamyl compounds: substrate specificity of gamma-glutamyl transpeptidase enzymes.''; PubMedEurope PMCScholia
Fan H, Derynck R.; ''Ectodomain shedding of TGF-alpha and other transmembrane proteins is induced by receptor tyrosine kinase activation and MAP kinase signaling cascades.''; PubMedEurope PMCScholia
Luo Y, Zheng SG.; ''Hall of Fame among Pro-inflammatory Cytokines: Interleukin-6 Gene and Its Transcriptional Regulation Mechanisms.''; PubMedEurope PMCScholia
Raulf M, König W, Köller M, Stüning M.; ''Release and functional characterization of the leukotriene D4-metabolizing enzyme (dipeptidase) from human polymorphonuclear leucocytes.''; PubMedEurope PMCScholia
Sulahian TH, Högger P, Wahner AE, Wardwell K, Goulding NJ, Sorg C, Droste A, Stehling M, Wallace PK, Morganelli PM, Guyre PM.; ''Human monocytes express CD163, which is upregulated by IL-10 and identical to p155.''; PubMedEurope PMCScholia
Huang MM, Indik Z, Brass LF, Hoxie JA, Schreiber AD, Brugge JS.; ''Activation of Fc gamma RII induces tyrosine phosphorylation of multiple proteins including Fc gamma RII.''; PubMedEurope PMCScholia
Gonzalez GA, Montminy MR.; ''Cyclic AMP stimulates somatostatin gene transcription by phosphorylation of CREB at serine 133.''; PubMedEurope PMCScholia
Ghazizadeh S, Bolen JB, Fleit HB.; ''Tyrosine phosphorylation and association of Syk with Fc gamma RII in monocytic THP-1 cells.''; PubMedEurope PMCScholia
Furlong MT, Mahrenholz AM, Kim KH, Ashendel CL, Harrison ML, Geahlen RL.; ''Identification of the major sites of autophosphorylation of the murine protein-tyrosine kinase Syk.''; PubMedEurope PMCScholia
Dusi S, Donini M, Della Bianca V, Rossi F.; ''Tyrosine phosphorylation of phospholipase C-gamma 2 is involved in the activation of phosphoinositide hydrolysis by Fc receptors in human neutrophils.''; PubMedEurope PMCScholia
Thomas BN, Buxbaum LU.; ''FcgammaRIII mediates immunoglobulin G-induced interleukin-10 and is required for chronic Leishmania mexicana lesions.''; PubMedEurope PMCScholia
Li X, Li HP, Amsler K, Hyink D, Wilson PD, Burrow CR.; ''PRKX, a phylogenetically and functionally distinct cAMP-dependent protein kinase, activates renal epithelial cell migration and morphogenesis.''; PubMedEurope PMCScholia
Pierce KD, Furlong TJ, Selbie LA, Shine J.; ''Molecular cloning and expression of an adenosine A2b receptor from human brain.''; PubMedEurope PMCScholia
Adrain C, Zettl M, Christova Y, Taylor N, Freeman M.; ''Tumor necrosis factor signaling requires iRhom2 to promote trafficking and activation of TACE.''; PubMedEurope PMCScholia
Srour N, Lebel A, McMahon S, Fournier I, Fugère M, Day R, Dubois CM.; ''TACE/ADAM-17 maturation and activation of sheddase activity require proprotein convertase activity.''; PubMedEurope PMCScholia
Morehead J, Coppens I, Andrews NW.; ''Opsonization modulates Rac-1 activation during cell entry by Leishmania amazonensis.''; PubMedEurope PMCScholia
Lee SH, Charmoy M, Romano A, Paun A, Chaves MM, Cope FO, Ralph DA, Sacks DL.; ''Mannose receptor high, M2 dermal macrophages mediate nonhealing Leishmania major infection in a Th1 immune environment.''; PubMedEurope PMCScholia
Agarwal A, Salem P, Robbins KC.; ''Involvement of p72syk, a protein-tyrosine kinase, in Fc gamma receptor signaling.''; PubMedEurope PMCScholia
Dendorfer U, Oettgen P, Libermann TA.; ''Multiple regulatory elements in the interleukin-6 gene mediate induction by prostaglandins, cyclic AMP, and lipopolysaccharide.''; PubMedEurope PMCScholia
Liang Z, Liu F, Grundke-Iqbal I, Iqbal K, Gong CX.; ''Down-regulation of cAMP-dependent protein kinase by over-activated calpain in Alzheimer disease brain.''; PubMedEurope PMCScholia
Adachi H, Kubota I, Okamura N, Iwata H, Tsujimoto M, Nakazato H, Nishihara T, Noguchi T.; ''Purification and characterization of human microsomal dipeptidase.''; PubMedEurope PMCScholia
Lee CW, Lewis RA, Corey EJ, Austen KF.; ''Conversion of leukotriene D4 to leukotriene E4 by a dipeptidase released from the specific granule of human polymorphonuclear leucocytes.''; PubMedEurope PMCScholia
Sekiya F, Poulin B, Kim YJ, Rhee SG.; ''Mechanism of tyrosine phosphorylation and activation of phospholipase C-gamma 1. Tyrosine 783 phosphorylation is not sufficient for lipase activation.''; PubMedEurope PMCScholia
SUTHERLAND EW, RALL TW.; ''Fractionation and characterization of a cyclic adenine ribonucleotide formed by tissue particles.''; PubMedEurope PMCScholia
Feldman DS, Zamah AM, Pierce KL, Miller WE, Kelly F, Rapacciuolo A, Rockman HA, Koch WJ, Luttrell LM.; ''Selective inhibition of heterotrimeric Gs signaling. Targeting the receptor-G protein interface using a peptide minigene encoding the Galpha(s) carboxyl terminus.''; PubMedEurope PMCScholia
McIlwain DR, Lang PA, Maretzky T, Hamada K, Ohishi K, Maney SK, Berger T, Murthy A, Duncan G, Xu HC, Lang KS, Häussinger D, Wakeham A, Itie-Youten A, Khokha R, Ohashi PS, Blobel CP, Mak TW.; ''iRhom2 regulation of TACE controls TNF-mediated protection against Listeria and responses to LPS.''; PubMedEurope PMCScholia
Zhang J, Berenstein E, Siraganian RP.; ''Phosphorylation of Tyr342 in the linker region of Syk is critical for Fc epsilon RI signaling in mast cells.''; PubMedEurope PMCScholia
El-Hillal O, Kurosaki T, Yamamura H, Kinet JP, Scharenberg AM.; ''syk kinase activation by a src kinase-initiated activation loop phosphorylation chain reaction.''; PubMedEurope PMCScholia
Anderson ME, Allison RD, Meister A.; ''Interconversion of leukotrienes catalyzed by purified gamma-glutamyl transpeptidase: concomitant formation of leukotriene D4 and gamma-glutamyl amino acids.''; PubMedEurope PMCScholia
Nagakura A, Takagi N, Takeo S.; ''Impairment of cerebral cAMP-mediated signal transduction system and of spatial memory function after microsphere embolism in rats.''; PubMedEurope PMCScholia
Platzer C, Meisel C, Vogt K, Platzer M, Volk HD.; ''Up-regulation of monocytic IL-10 by tumor necrosis factor-alpha and cAMP elevating drugs.''; PubMedEurope PMCScholia
Wenzel I, Roth J, Sorg C.; ''Identification of a novel surface molecule, RM3/1, that contributes to the adhesion of glucocorticoid-induced human monocytes to endothelial cells.''; PubMedEurope PMCScholia
Gu C, Cooper DM.; ''Calmodulin-binding sites on adenylyl cyclase type VIII.''; PubMedEurope PMCScholia
In view of the highly variable nature of antibody proteins, this biological object is an approximate and fragmented representation of an IgM/IgD antibody, given the limitations of Ig chain enumeration in UniProt. A single mRNA transcript is alternatively spliced to give either IgM or IgD. Thus unactivated B cells contain both classes of antibody.
Protein kinase A (PKA) has two regulatory subunits and two catalytic subunits which are held together to form the holoenzyme and is activated upon binding of cAMP to the regulatory subunits. Once cAMP binds the regulatory subunits, the catalytic subunits are released to carry out phosphorylation of CREB1 at serine residue S133. Only the PKA catalytic subunit alpha, PRKACA, was directly demonstrated to phosphorylate CREB1 at S133, using recombinant mouse and rat proteins, respectively (Gonzalez and Montminy 1989). PKA catalytic subunits beta and gamma (PRKACB and PRKACG) are candidate CREB1 kinases based on indirect evidence and sequence similarity (Nagakura et al. 2002, Liang et al. 2007, James et al. 2009). PRKX is the catalytic subunit of the cAMP dependent protein kinase X, which shares the regulatory subunits and functional properties with the PKA. PRKX is highly expressed in the mouse fetal brain (Li et al. 2005) and is implicated in CREB1 phosphorylation through indirect evidence (Di Pasquale and Stacey 1998, Li et al. 2002).
When cAMP level rises, the PKA catalytic subunit (C subunit) released from the holoenzyme enters the nucleus by passive diffusion whereas termination of signaling to the nucleus involves an active mechanism. In the nucleus, the C subunit binds to the heat-stable protein kinase inhibitor (PKI), and this binding not only inactivates the C subunit but also by conformational change unveils a nuclear export signal in PKI which leads to export of the C-PKI complex from the nucleus.
The protein kinase A (PKA) regulatory subunit isoforms differ in their tissue specificity and functional characteristics. The specific isoform activated in response to glucagon signaling is not known. The PKA kinase is a tetramer of two regulatory and two catalytic subunits. The regulatory subunits block the catalytic subunits. Binding of cAMP to the regulatory subunit triggers dissociation of the tetramer into two active dimers made up of a regulatory and a catalytic subunit.
Adenylate cyclase is responsive to calcium and calmodulin and produces cAMP. One important physiological role for Calmodulin is the regulation of adenylylcyclases. Four of the ten known adenylylcyclases are calcium sensitive, in particular type 8 (AC8).
G(s)-alpha:GTP binds to inactive adenylate cyclase, causing a conformational transition in adenylate cyclase exposing the catalytic site and activating it.
The IP3 receptor (IP3R) is an IP3-gated calcium channel. It is a large, homotetrameric protein, similar to other calcium channel proteins such as ryanodine. The four subunits form a 'four-leafed clover' structure arranged around the central calcium channel. Binding of ligands such as IP3 results in conformational changes in the receptor's structure that leads to channel opening.
On recruitment to plasma membrane PLC-gamma1 then hydrolyses PIP2 producing two second messengers, diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP3). IP3 induces a transient increase in intracellular free Ca++, while DAG is a direct activator of protein kinase C (PKC theta). These process have been implicated in many cellular physiological functions like cell proliferation, cell growth and differentiation.
Another outer surface membrane-bound, homodimeric enzyme, dipeptidase, existing in two forms DPEP1 (Adachi et al. 1989) and DPEP2 (Lee et al. 1983, Raulf et al. 1987), further hydrolyses leukotriene D4 (LTD4) to leukotriene E4 (LTE4), cleaving a glycine residue in the process.
The reversible conversion of leukotriene C4 (LTC4) to leukotriene D4 (LTD4) is catalysed by gamma-glutamyl transferases 1 (GGT1) and 5 (GGT5). GGTs are present on the outer surface of plasma membranes and are a heterodimer of a heavy and a light chain. Its action involves the hydrolysis of the gamma-glutamyl peptide bond of glutathione and glutathione conjugates, releasing glutamate. In this example, LTC4 is a glutathione conjugate that is hydrolysed to LTD4 (Anderson et al. 1982, Wickham et al. 2011).
The activation of adenylyl (adenylate) cyclase (AC) results in the production of adenosine-3',5'-monophosphate i.e. cyclic AMP. Humans have 9 genes encoding membrane-associated AC and one encoding a soluble AC. Two of the classes of heterotrimeric G-proteins are named according to their effect on AC; G(s) stimulates all membrane-bound ACs (the s in G(s) denotes AC stimulatory); the G(i) class inhibits some AC isoforms, particularly 5 and 6. Beta-gamma subunits of heterotrimeric G-proteins can also regulate AC. Ca2+/Calmodulin activates some AC isoforms (1, 8 and 3) but is inhibitory to others (5 and 6).
Protein kinase A (PKA) regulatory subunit isoforms differ in their tissue specificity and functional characteristics. The isoform activated in response to glucagon signaling is not known.
PKA kinase is a tetramer of two regulatory and two catalytic subunits. The regulatory subunits block the activity of the catalytic subunits.
cAMP binds the regulatory subunits, which leads to dissociation of the tetramer into two active dimers made up of a regulatory and a catalytic subunit.
The classical view of G-protein signalling is that the G-protein alpha subunit dissociates from the beta:gamma dimer. Activated G alpha (s) and the beta:gamma dimer then participate in separate signaling cascades. Although G protein dissociation has been contested (e.g. Bassi et al. 1996), recent in vivo experiments have demonstrated that dissociation does occur, though possibly not to completion (Lambert 2008).
The liganded receptor undergoes a conformational change, generating a signal that is propagated in a manner that is not completely understood to the the G-protein. This stimulates the exchange of GDP for GTP in the G-protein alpha subunit, activating the G-protein.
This event is negatively regulated by some Activators of G protein signaling (AGS) proteins, a class of proteins identified in yeast functional screens for proteins able to activate G protein signaling in the absence of a G protein–coupled receptor (GPCR) (Cismowski et al. 1999, Takesono et al. 1999). AGS proteins contain G protein regulatory (GPR) motifs (also referred to as the GoLoco motif) that bind and stabilize the Galpha subunit in its GDP-bound conformation (Mochizuki et al. 1996, Peterson et al. 2000, Cao et al. 2004, Blumer & Lanier 2014). Some RGS proteins similarly bind to Galpha preventing the exchange of GDP for GTP (Soundararajan et al. 2008).
The role of the guanine nucleotide-binding protein G alpha-s subunit (G alpha-s) (Kozasa T et al, 1988) is to activate adenylate cyclase, which, in turn, produces cAMP, which, in turn, activates cAMP-dependent protein kinase.
Adenosine receptors A2a and A2b (ADORA2A and ADORA2B) bind extracellular adenosine (Ado-Rib) and are believed to play a role in regulating myocardial oxygen consumption and coronary blood flow (Peterfreund 1996). The A2A receptor is responsible for regulating myocardial blood flow by vasodilation of the coronary arteries, which increases blood flow to the myocardium, but may lead to hypotension. Just as in A1 receptors, this normally serves as a protective mechanism. A2B receptor work (Pierce KD et al, 1992) has lagged behind research in the other adenosine receptors. Both ADORA receptors mediate their actions by coupling with the G protein alpha s subunit which activates adenylyl cyclase and increases intracellular cAMP concentrations. In surfactant physiology, the receptor:adenosine complex positively regulates surfactant export from lamellar bodies. (Cooper JA et al, 1995; Linden J et al, 1999). Adenosine deaminase (CECR1, ADA2) degrades extracellular adenosine (Ade-Rib), reducing or neutralising the positive regulatory effect of adenosine in surfactant export.
The IL-6 promoter contains several transcription factor-responsive elements (Luo and Zheng 2016). CREB, a classical cAMP-inducible CRE-binding factor interacts with a region of the IL-6 promoter that is known as CRE-like sequence (Dendorfer et al. 1994). Moreover, IL-6 is a pleiotropic cytokine produced by a wide variety of cells including macrophages, T cells, B cells, fibroblasts, and endothelial cells (Yang et al. 2014).
The gene for IL-6 is located at chromosome 7 whose unit transcription consists of 5 exons and 4 introns. The promoter region contains several transcription start sites with response elements for nuclear factor (NF)-κB, enhancer-binding protein beta (C/EPBβ; formerly NF-IL6), activator protein (AP)-1 (Burger 2013) and CREB transcription factor (Dendorfer et al. 1994). The protein form of human IL-6 is a glycoprotein composed of 184 amino acids with a molecular weight of 21-28 kDa, depending on its degree of glycosylation. It has a 4-helix bundle structure made up of 4 long α-helices arranged in an up-up-down-down topology (Burger 2013).
In mice, inactive rhomboid protein 2 (iRHOM2) has been shown to be required for disintegrin and metalloproteinase domain-containing protein 17's (ADAM17) exit from the ER (Cavadas et al. 2017), through the trans-Golgi network and on to the plasma membrane (Adrain et al. 2012, McIlwain et al. 2012, Issuree et al. 2013, Cavadas et al. 2017).
A crystallography study revealed that disintegrin and metalloproteinase domain-containing protein 17 (ADAM17) requires Zinc as a cofactor to function properly (Maskos et al. 1998).
The CD163 gene encodes scavenger receptor cysteine-rich type 1 protein M130 (CD163) which functions at the plasma membrane of macrophages (Etzerodt & Moestrup 2013). Glucocorticoid, interleukin (IL)-6 and IL-10 are some of the most potent stimulators of CD163 expression (Petra Högger et al. 1998, P Högger et al. 1998, Van den Heuvel et al. 1999, Buechler et al. 2000 & Sulahian et al. 2000, ). For simplicity, the steps involed in transcription and translation have been omitted.
Disintegrin and metalloproteinase domain-containing protein 17 (ADAM17) is a type I transmembrane protein that consist of an N-terminal signal sequence followed by a prodomain, a metalloproteinase (catalytic) domain, a disintegrin domain, an EGF-like (cysteine-rich) domain, a single transmembrane domain and a cytoplasmic domain (Scheller et al. 2011, Lambrecht et al. 2018). While ADAM17 is being transported through the trans-Golgi network, FURIN cleaves the prodomain region of ADAM17 releasing the inhibitory part (Milla et al. 1999, Gonzales et al. 2004, Wong et al. 2015) and leaving the catalytically-active form (ADAM17(215-827) (Srour et al. 2003, Endres et al. 2003, Adrain et al. 2012, McIlwain et al. 2012, Wong et al. 2015).
In mice, inactive rhomboid protein 2 (iRHOM2) has been shown to be required for disintegrin and metalloproteinase domain-containing protein 17's (ADAM17) exit from the ER (Cavadas et al. 2017), through the trans-Golgi network and on to the plasma membrane (Adrain et al. 2012, McIlwain et al. 2012, Issuree et al. 2013, Cavadas et al. 2017).
The phosphorylation of disintegrin and metalloproteinase domain-containing protein 17 (ADAM17) by PLK2 and MAPKs has been determined by direct and indirect experiments (Müllberg et al. 1993, Schwarz et al. 2014, Fan and Derynck 1999; Gechtman et al. 1999; DÃaz-RodrÃguez et al. 2002; Fan, Turck, and Derynck 2003 & Xu and Derynck 2010). Specifically, the phosphorylation at residues Thr735 (DÃaz-RodrÃguez et al. 2002 & Xu and Derynck 2010) and Ser819 is required for ectodomains shedding.
The scavenger receptor cysteine-rich type 1 (CD163) is a transmembrane macrophage protein which upon cleavage, leads to the release of a soluble form (sCD163, CD163(42-1050)) (Droste, Sorg, and Högger 1999 and Hintz et al. 2002). The inflammation-responsive protease ADAM17 can mediate the cleavage of CD163 to release sCD163 (Etzerodt et al. 2010 & Etzerodt et al. 2014).
The soluble form of CD163 (sCD163) has been suggested to inhibit activated T-lymphocyte proliferation (P Högger & Sorg 2001) by potentially binding to a non-muscle myosin heavy chain type a (MYH9) (Timmermann et al. 2004, Hou et al. 2019).
Multiple sites of phosphorylation are known to exist in SYK, which both regulate its activity and also serve as docking sites for other proteins. Some of these sites include Y131 of interdomain A, Y323, Y348, and Y352 of interdomain B, and Y525 and Y526 within the activation loop of the kinase domain and Y630 in the C-terminus (Zhang et al. 2002, Lupher et al. 1998, Furlong et al. 1997). Phosphorylation of these tyrosine residues disrupts autoinhibitory interactions and results in kinase activation even in the absence of phosphorylated ITAM tyrosines (Tsang et al. 2008). SYK is primarily phosphorylated by Src family kinases and this acts as an initiating trigger by generating few molecules of activated SYK which are then involved in major SYK autophosphorylation (Hillal et al. 1997).
Leishmania amastigotes parasites opsonized by IgG are more susceptible to be phagocytosed through FcγRs. Nevertheless, besides the phagocytosis induction, the interaction IgG-FcγRs has been implicated in the synthesis induction, of several cytokines (Buxbaum 2013; Chu et al. 2010; Thomas and Buxbaum 2008). In particular, Buxbaum et al. in 2008 showed that IgGs bound glycoinositol phospholipids (GIPLs) of L. Mexicana and that IgG:GIPLs induces the synthesis of IL-10 through FcγRIII.
PLCgamma (PLCG) is recruited to FCGR and the phosphorylated Y342 and Y346 in SYK have been reported to be involved in the interaction of PLCG (Law et al. 1996). PLCG accumulates at the phagocytic cup during FCGR, but the exact role of PLCG in the regulation of phagocytosis is not clear. It may be involved in FCGR signaling by activating PKC through DAG production (Garcia-Garcia & Rosales 2002 )
Activated PLCG translocates to the plasmamembrane and interacts with the inositol ring of the membrane bound phosphatidylinositol 4,5-bisphosphate (PIP2) with its PH domain. The active enzyme promotes intracelllular signaling by catalysing the hydrolysis of PIP2 to generate the second messengers IP3 and DAG.
SYK is a tyrosine kinase related to ZAP70 that is expressed in all hematopoietic cells and coimmunoprecipitates with the gamma chain associated with FCGRIIIA in macrophages and with FCERI in mast cells. SYK is very important for FCGR phagocytosis and is recruited to these phosphorylated ITAM residues through its two SRC homology 2 (SH2) domains (Agarwal et al. 1993). When SYK kinase expression is inhibited with antisense oligonucleotides both in vitro and in vivo, phagocytosis and inflammation are abolished (Matsuda et al. 1997). The domain structure of SYK comprises a regulatory region at the N-terminus consisting of a pair of SH2 domains separated by an inter-SH2 linker called interdomain A, an SH2-domain-kinase linker termed interdomain B, and a C-terminal kinase domain (Arias-Palomo et al. 2009). In resting state SYK exists in an auto-inhibited conformation by the interactions between the SH2-SH2 regulatory region and the inter-SH2 linker and the catalytic domain. This interdomain interaction reduces the conformational flexibility required by the kinase domain for catalysis (Arias-Palomo et al. 2007). Changes in the orientation of the SH2 domains could control the disruption of the auto inhibitory interactions and the activation of SYK. These movements could be totally or partially induced by the binding to phosphorylated ITAMs and/or phosphorylation of tyrosine residues in interdomain A or B (Arias-Palomo et al. 2009). Tsang et al. suggested that SYK functions as an OR-gate switch with respect to phosphorylation and ITAM binding, as either one stimulus OR the other is sufficient to cause full activation (Tsang et al. 2008).
After cross linking, Fc gamma receptors are sequestered to lipid rafts where they are complexed with some of the tyrosine kinases of Src family and undergo phosphorylation on the tyrosine residues contained in conserved ITAM sequences. At least six out of nine members of the Src family kinases (SRC, FYN, FGR, HCK, YES and LYN ) have been identified in the phagocytic cells and are implicated in the initiation of Fc gamma mediated signaling. (Suzuki et al. 2000, Majeed et al. 2001, Kwiatkowska et al. 2003). Some of these kinases have been found associated with specific receptors. In monocytes HCK and LYN have been found associated with FCGRI (Durden et al. 1995), whereas only HCK with FCGRIIA (Ghazizadeh et al. 1994) while FGR in neutrophils (Hamada et al. 1993) and LCK in NK cells with FCGRIIIA (Pignata et al. 1993) The implication of Src kinases in phosphorylation was first supported by pharmacological findings that herbimycin A, a tyrosine kinase inhibitor relatively specific for Src-family kinases, potently suppressed Fc receptor mediated functions (Greenberg et al. 1993, Suzuki et al. 2000). However, their particular involvement in phagocytosis remains unclear, as targeted disruption of single or multiple Src family genes did not result in significant alterations in phagocytosis (Hunter et al. 1993, Fitzer Attas et al. 2000, Suzuki et al. 2000). HCK, FGR and LYN triple-deficient (-/-) macrophages have shown significant delays in FCGR mediated phagocytosis, but these deficiencies do not completly disrupt the process (Fitzer Attas et al. 2000). Tyrosine residues Y288 and Y304 (Y282 and Y298 according to the literature reference, it is 6 residues shorter compared to uniprot entry due to an alternate initiation codon usage), within ITAM sequence in the cytoplasmic domain of FCGRIIA are the key target sites that are phosphorylated by Src family kinases (Mitchell et al, 1994). In case of FCGRIA and FCGRIIIA the specific tyrosine residues within ITAMs of the associated gamma/zeta chains are phosphorylated by activated Src family kinases (SFKs) (Park et al. 1993).
PLCG is tyrosine phosphorylated by either SYK or Src kinases on three tyrosine residues and this phosphorylation enhances the activity of PLCG. Although maximal activation requires binding of PLCG to PIP3 with its plecstrin homology (PH) domain.
The internalization of Leishmania amastigotes by macrophages is thought to be mediated mainly through opsonization with immunoglobulins (Igs) which bind Fc gamma receptors (FCGRs), stimulating their uptake (Morehead et al 2002 & Padigel et al. 2005). Glycoinositol phospholipids (GIPLs) are the most abundant glycolipids on the surface of the amastigote form of Leishmania parasites and Buxbaum and colleagues showed that IgG1 in mice binds GIPL molecules on the amastigote stage of L. mexicana to subsequently induce phagocytosis through FCGRs (Buxbaum 2013).
The cysteinyl-leukotrienes (cys-LTs) are potent smooth muscle contractile agents mediating bronchoconstriction. Examples are LTC4, LTD4 and LTE4. There are two human cys-LT receptors, 1 (Lynch KR et al, 1999) and 2 (Heise CE et al, 2000). They mediate their effects via coupling to the G protein alpha q/11 subunit (Sarau HM et al, 1999). However, signalling downstream LTC4-cysLTR binding has been associated with the production of IL4, independent of the GPCR associated heterotrimeric protein Gq (Bandeira Melo et al. 2002).
The IL-10 promoter contains several transcription factor-responsive elements. (Asadullah et al 2003). In macrophages, the major source of IL-10, several receptor-mediated cytokine transcription end up in the activation of IL10 transcription factors, such as CREB (Platzer et al. 1995, Kelly et al 2010 & Sanin et al 2015)
The Interleukin 10 (IL10) gene is located at chromosome 1q31-32. It encodes for a protein with the same name that acts as a pleiotropic cytokine expressed primarily by monocytes and to a smaller degree by lymphocytes. IL10 down-regulates the expression of Th1 cytokines, MHC class II and costimulatory molecules on macrophages (Eskdale et al. 1997).
The internalization of Leishmania amastigotes by macrophages is thought to be mediated mainly through opsonization with immunoglobulins (Igs) which bind FcγRs, stimulating the uptake (Morehead et al 2002 & Padigel et al. 2005). Glycoinositol phospholipids (GIPLs) are the most abundant glycolipids on the surface of the amastigote form of Leishmania parasites and Buxbaum and colleagues showed that IgG1 in mice, binds the GIPL molecules on the amastigote stage of L. mexicana to subsequently induced the phagocytosis through FcγRs (Buxbaum 2013).
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(s):GTP:Adenylate
cyclase(i):GTP:Adenylate
cyclase(z):GTP:Adenylate
cyclaseG-protein Gs
(inactive)antigens:FCGR3A:CD3
dimerscomplexes that activate Gs:Heterotrimeric G-protein Gs
(inactive)Annotated Interactions
(s):GTP:Adenylate
cyclase(s):GTP:Adenylate
cyclase(i):GTP:Adenylate
cyclase(z):GTP:Adenylate
cyclaseG-protein Gs
(inactive)antigens:FCGR3A:CD3
dimersantigens:FCGR3A:CD3
dimerscomplexes that activate Gs:Heterotrimeric G-protein Gs
(inactive)PKA kinase is a tetramer of two regulatory and two catalytic subunits. The regulatory subunits block the activity of the catalytic subunits.
cAMP binds the regulatory subunits, which leads to dissociation of the tetramer into two active dimers made up of a regulatory and a catalytic subunit.
Both ADORA receptors mediate their actions by coupling with the G protein alpha s subunit which activates adenylyl cyclase and increases intracellular cAMP concentrations. In surfactant physiology, the receptor:adenosine complex positively regulates surfactant export from lamellar bodies. (Cooper JA et al, 1995; Linden J et al, 1999). Adenosine deaminase (CECR1, ADA2) degrades extracellular adenosine (Ade-Rib), reducing or neutralising the positive regulatory effect of adenosine in surfactant export.
The implication of Src kinases in phosphorylation was first supported by pharmacological findings that herbimycin A, a tyrosine kinase inhibitor relatively specific for Src-family kinases, potently suppressed Fc receptor mediated functions (Greenberg et al. 1993, Suzuki et al. 2000). However, their particular involvement in phagocytosis remains unclear, as targeted disruption of single or multiple Src family genes did not result in significant alterations in phagocytosis (Hunter et al. 1993, Fitzer Attas et al. 2000, Suzuki et al. 2000). HCK, FGR and LYN triple-deficient (-/-) macrophages have shown significant delays in FCGR mediated phagocytosis, but these deficiencies do not completly disrupt the process (Fitzer Attas et al. 2000).
Tyrosine residues Y288 and Y304 (Y282 and Y298 according to the literature reference, it is 6 residues shorter compared to uniprot entry due to an alternate initiation codon usage), within ITAM sequence in the cytoplasmic domain of FCGRIIA are the key target sites that are phosphorylated by Src family kinases (Mitchell et al, 1994). In case of FCGRIA and FCGRIIIA the specific tyrosine residues within ITAMs of the associated gamma/zeta chains are phosphorylated by activated Src family kinases (SFKs) (Park et al. 1993).