Protein Tyrosine Kinase Activation and Protein Kinase C Translocation Are Functional Components of CD40 Signal Transduction in Resting Human B Cells

1994 ◽  
Vol 23 (6-7) ◽  
pp. 437-448 ◽  
Author(s):  
Clement L. Ren ◽  
Shu Man Fu ◽  
Raif S. Geha
Keyword(s):  
Signal Transduction ◽  
Protein Kinase C ◽  
B Cells ◽  
Protein Kinase ◽  
Tyrosine Kinase ◽  
Protein Tyrosine Kinase ◽  
Kinase Activation ◽  
Kinase C ◽  
Human B Cells ◽  
Functional Components

Endothelin-1–Induced Interleukin-8 Production in Human Brain-Derived Endothelial Cells Is Mediated by the Protein Kinase C and Protein Tyrosine Kinase Pathways

Blood ◽  
1999 ◽  
Vol 94 (4) ◽  
pp. 1291-1299 ◽  
Author(s):  
R. Zidovetzki ◽  
P. Chen ◽  
M. Chen ◽  
F.M. Hofman
Keyword(s):  
Signal Transduction ◽  
Endothelial Cells ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Tyrosine Kinase ◽  
Protein Tyrosine Kinase ◽  
Protein Tyrosine ◽  
Kinase C ◽  
Eta Receptor ◽  
Specific Inhibitors

We have previously demonstrated that endothelin-1 (Et-1) induces human central nervous system-derived endothelial cells (CNS-EC) to produce and secrete the chemokine interleukin 8 (IL-8). In the present study, we use specific inhibitors and activators to elucidate the signal transduction pathways involved in this process. Et-1–induced IL-8 production was blocked by ETA receptor antagonist BQ610, but not by ETB receptor antagonist BQ788, demonstrating that CNS-EC activation is initiated by Et-1 binding to the ETA receptor. IL-8 mRNA expression is blocked by the protein kinase C inhibitor bisindolylmaleimide or protein tyrosine kinase inhibitors, genestein and geldanamycin, establishing the involvement of the protein kinase C and protein tyrosine kinase pathways in the activation process. The transcription factor, NF-κB, is involved in Et-1 activation as determined by specific inhibitors of translocation and direct analysis of DNA-binding proteins. Neither inhibition nor activation of cAMP-dependent protein kinase affected IL-8 production in the absence or presence of Et-1. Similarly, no effect was observed upon inhibition of protein phosphatases by okadaic acid. Thus, the signal transduction process induced by Et-1 in CNS-EC, leading to increased mRNA IL-8 expression, is initiated by Et-1 binding to ETA receptor followed by subsequent activation of protein kinase C, protein tyrosine kinase, and NF-κB. Because increased expression of Et-1 is associated with hypertension and stroke and IL-8 is likely to be involved in the accumulation of neutrophils causing tissue damage in ischemic/reperfusion injury, identification of the mechanism involved in the Et-1–induced increase in IL-8 production may have significant therapeutic value.

Endothelin-1–Induced Interleukin-8 Production in Human Brain-Derived Endothelial Cells Is Mediated by the Protein Kinase C and Protein Tyrosine Kinase Pathways

Blood ◽  
1999 ◽  
Vol 94 (4) ◽  
pp. 1291-1299 ◽  
Author(s):  
R. Zidovetzki ◽  
P. Chen ◽  
M. Chen ◽  
F.M. Hofman
Keyword(s):  
Signal Transduction ◽  
Endothelial Cells ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Tyrosine Kinase ◽  
Protein Tyrosine Kinase ◽  
Protein Tyrosine ◽  
Kinase C ◽  
Eta Receptor ◽  
Specific Inhibitors

Abstract We have previously demonstrated that endothelin-1 (Et-1) induces human central nervous system-derived endothelial cells (CNS-EC) to produce and secrete the chemokine interleukin 8 (IL-8). In the present study, we use specific inhibitors and activators to elucidate the signal transduction pathways involved in this process. Et-1–induced IL-8 production was blocked by ETA receptor antagonist BQ610, but not by ETB receptor antagonist BQ788, demonstrating that CNS-EC activation is initiated by Et-1 binding to the ETA receptor. IL-8 mRNA expression is blocked by the protein kinase C inhibitor bisindolylmaleimide or protein tyrosine kinase inhibitors, genestein and geldanamycin, establishing the involvement of the protein kinase C and protein tyrosine kinase pathways in the activation process. The transcription factor, NF-κB, is involved in Et-1 activation as determined by specific inhibitors of translocation and direct analysis of DNA-binding proteins. Neither inhibition nor activation of cAMP-dependent protein kinase affected IL-8 production in the absence or presence of Et-1. Similarly, no effect was observed upon inhibition of protein phosphatases by okadaic acid. Thus, the signal transduction process induced by Et-1 in CNS-EC, leading to increased mRNA IL-8 expression, is initiated by Et-1 binding to ETA receptor followed by subsequent activation of protein kinase C, protein tyrosine kinase, and NF-κB. Because increased expression of Et-1 is associated with hypertension and stroke and IL-8 is likely to be involved in the accumulation of neutrophils causing tissue damage in ischemic/reperfusion injury, identification of the mechanism involved in the Et-1–induced increase in IL-8 production may have significant therapeutic value.

Canine pulmonary vasoreactivity to serotonin: role of protein kinase C and tyrosine kinase

1997 ◽  
Vol 272 (2) ◽  
pp. H740-H747 ◽  
Author(s):  
S. A. Barman ◽  
J. R. Pauly ◽  
C. M. Isales
Keyword(s):  
Signal Transduction ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Tyrosine Kinase ◽  
Protein Tyrosine Kinase ◽  
Vascular Response ◽  
Protein Tyrosine ◽  
Kinase C ◽  
Voltage Dependent

The role of protein kinase C- and protein tyrosine kinase-mediated signal transduction in the canine pulmonary vascular response to serotonin (5-HT) was determined in the isolated blood-perfused dog lung. Pulmonary vascular resistances and compliances were measured with vascular occlusion techniques. 5-HT (10(-5) M) significantly increased precapillary resistance by approximately 150% and postcapillary resistance twofold and significantly decreased total vascular compliance to approximately 50% of control values by decreasing large-vessel compliance and middle-compartment compliance. The 5-HT2-receptor blocker ketanserin (10(-7) M), the protein kinase C inhibitor staurosporine (10(-7) M), the voltage-dependent Ca2+-channel blocker verapamil (10(-5) M), and the specific protein tyrosine kinase inhibitors genistein (5 x 10(-4) M) and tyrphostin 25 (5 x 10(-4) M) completely inhibited the pressor response to 5-HT, whereas the 5-HT1-receptor antagonist (-)pindolol (10(-7) M) had no significant effect on the serotonergic response. These results indicate that the canine pulmonary vascular response to 5-HT involves activation of 5-HT2 receptors and suggests that this receptor signal transduction pathway involves protein kinase C and tyrosine kinase and the activation of voltage-dependent Ca2+ channels.

scholarly journals Mitogenic Response of Murine B Lymphocytes to Salmonella typhimurium Lipopolysaccharide Requires Protein Kinase C-Dependent Late Tyrosine Phosphorylations

1998 ◽  
Vol 66 (6) ◽  
pp. 2547-2552 ◽  
Author(s):  
Anne Mey ◽  
Jean-Pierre Revillard
Keyword(s):  
Protein Synthesis ◽  
Protein Kinase C ◽  
B Cells ◽  
Protein Kinase ◽  
Tyrosine Kinase ◽  
Kinase Inhibitors ◽  
Cross Linking ◽  
Kinase Activation ◽  
Herbimycin A ◽  
Kinase C

ABSTRACT Unlike the cross-linking of membrane immunoglobulins, the activation of B cells by lipopolysaccharide (LPS) does not involve the phosphoinositol turnover and the initial activation of tyrosine kinases. However, LPS-induced B-cell proliferation was inhibited by the tyrosine kinase inhibitors genistein and herbimycin A even when added 48 h after the beginning of the culture. Tyrosyl-phosphorylated proteins were detected by Western blotting after 24 h of culture with LPS, reaching a maximum concentration after 72 h. Late tyrosine phosphorylations were also detected in B cells activated for 72 h with anti-immunoglobulin M antibody and were abrogated by the protein synthesis inhibitor cycloheximide, the tyrosine kinase inhibitors genistein and herbimycin A, and the protein kinase C inhibitor chelerythrine. The role of protein kinase C in late tyrosine kinase activation is independent of Ca2+mobilization and was confirmed by detection of a comparable but restricted pattern of tyrosine-phosphorylated substrates in B cells treated with phorbol myristate acetate alone or in association with ionomycin. Tyrosine kinase activation was dependent on de novo protein synthesis. However, culture supernatants of LPS-activated B cells were devoid of mitogenic activity and induced a phosphorylation pattern more restricted than that achieved by LPS. Altogether these data indicate that proliferation signals induced by LPS or by the cross-linking of membrane immunoglobulins are controlled by late tyrosine phosphorylations occurring throughout the first 3 days of culture, controlled in part by protein kinase C activation, and dependent on the synthesis of an intermediate protein(s) either not secreted in the culture supernatant or present but biologically inactive in naive B cells.

scholarly journals The expression of COX-2 in VEGF-treated endothelial cells is mediated through protein tyrosine kinase

2002 ◽  
Vol 11 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Pravit Akarasereenont ◽  
Kitirat Techatraisak ◽  
Athiwat Thaworn ◽  
Sirikul Chotewuttakorn
Keyword(s):  
Endothelial Cells ◽  
Protein Kinase C ◽  
Protein Kinase ◽  
Tyrosine Kinase ◽  
Protein Tyrosine Kinase ◽  
Kinase Inhibitor ◽  
Kinase C ◽  
Protein Kinase C Inhibitor ◽  
Cox 2 ◽  
Cox 1

Cyclooxygenase (COX), existing as the COX-1 and COX-2 isoforms, converts arachidonic acid to prostaglandin H2, which is then further metabolized to various prostaglandins. Vascular endothelial growth factor (VEGF) has been shown to play important roles in inflammation and is upregulated by the prostaglandin E series through COX-2 in several cell types. Here, we have investigated the effects of VEGF on the COX isoform expressed in human umbilical vein endothelial cells (HUVEC). The signalling mechanism of the COX isoform expressed in endothelial cells activated with VEGF will be also investigated using the tyrosine kinase inhibitor, genistein, and protein kinase C inhibitor, staurosporine. The activity of COX2 was assessed by measuring the production of 6-keto-prostaglandin F1α in the presence of exogenous arachidonic acids (10 μM, 10 min) by enzyme immunoassay. The expression of COX isoform protein was detected by immunoblot using specific antibodies. Untreated HUVEC contained no COX-2 protein. In HUVEC treated with VEGF (0.01-50 ng/ml), COX-2 protein, but not COX-1, and COX activity were increased in a dose-dependent manner. Interestingly, the increased COX-2 protein and activity in response to VEGF (10 ng/ml) was inhibited by the tyrosine kinase inhibitor, genistein (0.05-5 μg/ml), but not by the protein kinase C inhibitor, staurosporine (0.1-10 ng/ml). Thus, the induction of COX-2 by VEGF in endothelial cells was mediated through protein tyrosine kinase, and the uses of specific COX-2 inhibitors in these conditions, in which VEGF was involved, might have a role.

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