scholarly journals Leukocyte response integrin and integrin-associated protein act as a signal transduction unit in generation of a phagocyte respiratory burst.

1993 ◽  
Vol 178 (4) ◽  
pp. 1165-1174 ◽  
Author(s):  
M Zhou ◽  
E J Brown
Keyword(s):  
Signal Transduction ◽  
Membrane Protein ◽  
Respiratory Burst ◽  
Kinase Inhibitors ◽  
Solid Phase ◽  
Enhanced Sensitivity ◽  
Basement Membrane Protein ◽  
Coated Surfaces ◽  
Leukocyte Response ◽  
Distinct Membrane

The leukocyte response integrin (LRI) is a phagocyte integrin which recognizes the basement membrane protein entactin and the synthetic peptide Lys-Gly-Ala-Gly-Asp-Val (KGAGDV). The function of LRI is intimately associated with that of a distinct membrane protein, integrin-associated protein (IAP), as antibodies which recognizes IAP can inhibit all known functions of LRI. When adherent to surface, the LRI ligands entactin and KGAGDV activate the respiratory burst in polymorphonuclear leukocytes (PMN) and monocytes, as do monoclonal antibodies (mAb) directed at either LRI or IAP. When added in solution, peptides and antibodies specific for LRI, and some, but not all, anti-IAP antibodies, can inhibit the respiratory burst activated by any of these surface-adherent ligands. Only monoclonal anti-IAP antibodies which can inhibit LRI function when added in solution are competent to activate the respiratory burst when adherent to a surface. KGAGDV peptide and anti-LRI added in solution can inhibit anti-IAP-stimulated respiratory burst. The LRI-IAP-initiated respiratory burst is independent of CD18, as judged by: (a) blockade of inhibition by anti-CD18 mAb with the protein kinase A inhibitor HA1004; (b) enhanced sensitivity of CD18-dependent respiratory burst compared with LRI/IAP-dependent respiratory burst to the tyrosine kinase inhibitors genestein and herbimicin; and (c) generation of a respiratory burst in response to KGAGDV, anti-LRI, and anti-IAP coated surfaces in PMN from a patient with LAD. Despite its apparent CD18 independence, LRI/IAP-initiated respiratory burst requires a solid phase ligand and is sensitive to cytochalasin B. These data suggest a model in which LRI and IAP act together as a single signal transduction unit to activate the phagocyte respiratory burst, in a manner that requires CD18-independent cell adhesion.

Protein Sorting in Healthy and Diseased Photoreceptors

2019 ◽  
Vol 5 (1) ◽  
pp. 73-98 ◽  
Author(s):  
Yoshikazu Imanishi
Keyword(s):  
Signal Transduction ◽  
Membrane Protein ◽  
Outer Segment ◽  
Protein Sorting ◽  
Rods And Cones ◽  
Retinal Photoreceptor ◽  
Photoreceptor Neurons ◽  
Cellular Compartments ◽  
G Protein Coupled ◽  
Distinct Membrane

Rods and cones are retinal photoreceptor neurons required for our visual sensation. Because of their highly polarized structures and well-characterized processes of G protein–coupled receptor–mediated phototransduction signaling, these photoreceptors have been excellent models for studying the compartmentalization and sorting of proteins. Rods and cones have a modified ciliary compartment called the outer segment (OS) as well as non-OS compartments. The distinct membrane protein compositions between OS and non-OS compartments suggest that the OS is separated from the rest of the cellular compartments by multiple barriers or gates that are selectively permissive to specific cargoes. This review discusses the mechanisms of protein sorting and compartmentalization in photoreceptor neurons. Proper sorting and compartmentalization of membrane proteins are required for signal transduction and transmission. This review also discusses the roles of compartmentalized signaling, which is compromised in various retinal ciliopathies.

scholarly journals Respiratory burst in adherent human neutrophils: triggering by colony- stimulating factors CSF-GM and CSF-G

Blood ◽  
1989 ◽  
Vol 73 (1) ◽  
pp. 301-306 ◽  
Author(s):  
CF Nathan
Keyword(s):  
Basement Membrane ◽  
Membrane Protein ◽  
Immune Responses ◽  
Respiratory Burst ◽  
Mononuclear Cells ◽  
Tnf Alpha ◽  
Human Neutrophils ◽  
Colony Stimulating Factors ◽  
Molar Basis ◽  
Basement Membrane Protein

Human neutrophils adherent to proteins derived from serum or plasma, or to the basement membrane protein laminin, underwent a delayed but massive respiratory burst in response to recombinant human CSF-GM or CSF-G. No such response was elicited from neutrophils in suspension. On a molar basis, CSF-GM (EC50 approximately 126 pmol/L) and CSF-G (EC50 approximately 585 pmol/L) were about as potent as TNF alpha and TNF beta in their elicitation of H2O2 release and orders of magnitude more potent than previously studied formylated peptides or C5a. CSF-GM and CSF-G prime suspended neutrophils for a respiratory burst in response to soluble agonists, such as formylated peptides. Compared to the CSF- primed respiratory burst of nonadherent neutrophils, the CSF-triggered response of adherent neutrophils is markedly more delayed in onset (73 to 95 minutes), prolonged in duration (150 to 180 minutes), and greater in extent (approximately 60 to 100 nmol H2O2 released/10(6) neutrophils). Neither CSF-M, interleukin-3 (IL-3), nor bacterial lipopolysaccharide triggered the respiratory burst in adherent neutrophils, nor did CSF-GM or CSF-G trigger a respiratory burst in adherent monocytes. Release of CSF-GM and CSF-G in response to antigens, bacterial products, or cytokines may give mononuclear cells control over the respiratory burst of noncirculating neutrophils during inflammatory and immune responses.

scholarly journals Respiratory burst in adherent human neutrophils: triggering by colony- stimulating factors CSF-GM and CSF-G

Blood ◽  
1989 ◽  
Vol 73 (1) ◽  
pp. 301-306 ◽  
Author(s):  
CF Nathan
Keyword(s):  
Basement Membrane ◽  
Membrane Protein ◽  
Immune Responses ◽  
Respiratory Burst ◽  
Mononuclear Cells ◽  
Tnf Alpha ◽  
Human Neutrophils ◽  
Colony Stimulating Factors ◽  
Molar Basis ◽  
Basement Membrane Protein

Abstract Human neutrophils adherent to proteins derived from serum or plasma, or to the basement membrane protein laminin, underwent a delayed but massive respiratory burst in response to recombinant human CSF-GM or CSF-G. No such response was elicited from neutrophils in suspension. On a molar basis, CSF-GM (EC50 approximately 126 pmol/L) and CSF-G (EC50 approximately 585 pmol/L) were about as potent as TNF alpha and TNF beta in their elicitation of H2O2 release and orders of magnitude more potent than previously studied formylated peptides or C5a. CSF-GM and CSF-G prime suspended neutrophils for a respiratory burst in response to soluble agonists, such as formylated peptides. Compared to the CSF- primed respiratory burst of nonadherent neutrophils, the CSF-triggered response of adherent neutrophils is markedly more delayed in onset (73 to 95 minutes), prolonged in duration (150 to 180 minutes), and greater in extent (approximately 60 to 100 nmol H2O2 released/10(6) neutrophils). Neither CSF-M, interleukin-3 (IL-3), nor bacterial lipopolysaccharide triggered the respiratory burst in adherent neutrophils, nor did CSF-GM or CSF-G trigger a respiratory burst in adherent monocytes. Release of CSF-GM and CSF-G in response to antigens, bacterial products, or cytokines may give mononuclear cells control over the respiratory burst of noncirculating neutrophils during inflammatory and immune responses.

Signal transduction therapy of colon tumors with multiple target kinase inhibitors

2009 ◽  
Vol 47 (05) ◽  
Author(s):  
G Kéri ◽  
L Őrfi ◽  
Z Greff ◽  
Z Varga ◽  
B Szokol ◽  
...  
Keyword(s):  
Signal Transduction ◽  
Kinase Inhibitors ◽  
Multiple Target ◽  
Colon Tumors ◽  
Signal Transduction Therapy

scholarly journals Evidence that tumor necrosis factor alpha (TNF)-induced activation of neutrophil respiratory burst on biologic surfaces is mediated by the p55 TNF receptor

Blood ◽  
1994 ◽  
Vol 84 (1) ◽  
pp. 287-293
Author(s):  
R Menegazzi ◽  
R Cramer ◽  
P Patriarca ◽  
P Scheurich ◽  
P Dri
Keyword(s):  
Respiratory Burst ◽  
Tumor Necrosis ◽  
Tnf Receptor ◽  
Necrosis Factor Alpha ◽  
Agonistic Activity ◽  
Factor Alpha ◽  
Coated Surfaces ◽  
O2 Production ◽  
Agonistic Effect ◽  
Necrosis Factor

Polymorphonuclear leukocytes (PMN) residing on biologic surfaces respond with a vigorous respiratory burst when exposed to tumor necrosis factor alpha (TNF). PMN possess both the p55 and the p75 TNF receptors, but their role in the elicitation of the respiratory burst is not known. We addressed this problem by studying the effect of monoclonal antibodies (MoAbs) directed against the p55 TNF receptor (MoAb H398 and MoAb htr-9) and the p75 TNF receptor (MoAb utr-1) on TNF- induced production of O2- by PMN residing on fibronectin-coated surfaces. Neither the anti-p55 nor the anti-p75 MoAbs affected TNF- induced O2- production despite their known ability to competitively inhibit TNF binding to the corresponding receptor. Experiments with the antibodies alone showed that the anti-p55 MoAbs directly triggered PMN O2- production, whereas no response was elicited by the anti-p75 MoAb. PMN unresponsiveness to the anti-p75 MoAb could not be ascribed to low expression of p75 receptor, because binding of the anti-p75 MoAb utr-1 to PMN was, indeed, even higher than binding of the anti-p55 MoAb htr- 9. The agonistic activity of the anti-p55 MoAbs was comparable with that of TNF and was not or only minimally modified by the simultaneous presence of TNF. Triggering of the respiratory burst by TNF was completely prevented by Fab fragments of the anti-p55 MoAb H398. Moreover, the monovalent Fab fragments, which lacked any stimulatory effect on PMN O2- production, acquired strong agonistic activity on cross-linking with anti Fab antibodies, suggesting that the ability of the anti-p55 antibodies to stimulate PMN O2- production depends on their ability to cross-link the TNF receptors. The agonistic effect of the anti-p55 MoAbs was only observed with cells residing on fibronectin- coated surfaces and not with cells in suspension, and in terms of kinetics, dependence on beta 2 integrin-mediated adherence, microfilament integrity, and sensitivity to elevations of intracellular levels of cAMP, it was virtually indistinguishable from the agonistic effect of TNF. Taken together, these results suggest that the p55 receptor is responsible for TNF-induced triggering of the respiratory burst of PMN residing on biologic surfaces.

scholarly journals ROLE OF SERIN/ THREONINE KINASE INHIBITOR IN THERAPY NON-ALCOHOLIC STEATOHEPATITIS AND ALCOHOLIC HEPATITIS

2019 ◽  
Vol 6 (3) ◽  
pp. 101-109
Author(s):  
Novriantika Lestari
Keyword(s):  
Signal Transduction ◽  
Liver Fibrosis ◽  
Kinase Inhibitors ◽  
Kinase Inhibitor ◽  
Binding Activity ◽  
Serine Threonine Kinase ◽  
Threonine Kinase ◽  
Receptor Binding Activity ◽  
Marked Accumulation

Liver fibrosis is a reversible response to a wound healing with marked accumulation of extracellular matrix which caused by injury to the liver. Liver fibrosis can be caused by various factors including alcohol and non-alcohol steatohepatitis. The process of fibrosis serves to localize the inflammation during chronic exposure. The hepatic stem cell (HSC) has a key role in the pathogenesis of liver fibrosis. The HSC activation is characterized by increased profibrogenic mediators including members of the TGF-? superfamily. In order to enable signal transduction, the mediator needs to bind to its receptors. The serine/ threonine kinase receptor is a receptor that binds to the TGF-? superfamily ligand, including TGF-?, BMP, activin and other mediators. The ligand receptor-binding activity will stimulate signal transduction that will translocate into the nucleus and phosphorylate various transcription factors that play a role in cell proliferation, differentiation, or apoptosis. There is currently no standard therapy for liver fibrosis. Based on the central role of the serine/ threonine kinase receptor in the pathogenesis of liver fibrosis, it is thought that the use of serine/ threonine kinase inhibitors is a promising therapy.

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