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PubMed1999

PTEN modulates cell cycle progression and cell survival by regulating phosphatidylinositol 3,4,5,-trisphosphate and Akt/protein kinase B signaling pathway.

To investigate the molecular basis of PTEN-mediated tumor suppression, we introduced a null mutation into the mouse Pten gene by homologous recombination in embryonic stem (ES) cells. Pten-/- ES cells exhibited an increased growth rate and proliferated even in the absence of serum. ES cells lacking PTEN function also displayed advanced entry into S phase. This accelerated G1/S transition was accompanied by down-regulation of p27(KIP1), a major inhibitor for G1 cyclin-dependent kinases. Inactivation of PTEN in ES cells and in embryonic fibroblasts resulted in elevated levels of phosphatidylinositol 3,4,5,-trisphosphate, a product of phosphatidylinositol 3 kinase. Consequently, PTEN deficiency led to dosage-dependent increases in phosphorylation and activation of Akt/protein kinase B, a well-characterized target of the phosphatidylinositol 3 kinase signaling pathway. Akt activation increased Bad phosphorylation and promoted Pten-/- cell survival. Our studies suggest that PTEN regulates the phosphatidylinositol 3,4, 5,-trisphosphate and Akt signaling pathway and consequently modulates two critical cellular processes: cell cycle progression and cell survival.

Animals↗
PubMed2003

JlpA of Campylobacter jejuni interacts with surface-exposed heat shock protein 90alpha and triggers signalling pathways leading to the activation of NF-kappaB and p38 MAP kinase in epithelial cells.

Campylobacter jejuni is a leading cause of acute bacterial gastroenteritis in humans. The mechanism by which C. jejuni interacts with host cells, however, is still poorly understood. Our previous study has shown that the C. jejuni surface lipoprotein JlpA mediates adherence of the bacterium to epithelial cells. In this report, we demonstrated that JlpA interacts with HEp-2 cell surface heat shock protein (Hsp) 90alpha and initiates signalling pathways leading to activation of NF-kappaB and p38 MAP kinase. Gel overlay and GST pull down assays showed that JlpA interacts with Hsp90alpha. Geldanamycin, a specific inhibitor of Hsp90, and anti-human Hsp90alpha antibody significantly blocked the interaction between JlpA and Hsp90alpha, suggesting a direct interaction between JlpA and HEp-2 cell surface-exposed Hsp90alpha. The treatment of HEp-2 cells with GST-JlpA initiated two signalling pathways: one leading to the phosphorylation and degradation of IkappaB and nuclear translocation of NF-kappaB; and another one to the phosphorylation of p38 MAP kinase. The activation of NF-kappaB and p38 MAP kinase in HEp-2 cells suggest that JlpA triggers inflammatory/immune responses in host cells following C. jejuni infection.

Adhesins, Bacterial↗
PubMed1999

Signaling pathways mediating gastrin's growth-promoting effects.

In addition to its fundamental role in stimulating gastric acid secretion, the peptide hormone gastrin induces growth-promoting effects on diversity of target cells. Various mechanisms, including endocrine, paracrine, and autocrine, have been proposed for gastrin's growth-promoting actions. The mitogenic effects of gastrin are mediated by specific cell surface receptors activated after gastrin binding. The functionally defined receptors for gastrin include cholecystokinin A (CCKA) receptor, which is discriminating for sulfated CCK8; cholecystokinin B (CCKB)/gastrin receptor, which binds gastrin17 sulfated, and nonsulfated CCK8 with nearly equal affinities; cholecystokinin C (CCKC), which is a low-affinity gastrin binding protein; and novel, high-affinity receptors selective for amidated gastrin, processing intermediates of gastrin, or both. The signaling pathways mediating gastrin's stimulation of the CCKB/gastrin receptor have been progressively outlined, and the pathways mediating other receptors have been slowly emerging. Engagement of the gastrin receptor initiates various biochemical and molecular events, including recruitment and activation of tyrosine kinases, activation of the phospholipase C signaling pathway leading to phosphoinositide breakdown, intracellular calcium mobilization and protein kinase C stimulation, activation of the mitogen-activated protein kinase pathway, and induction of early response genes. Current emphasis is on understanding the functional significance of processing intermediate forms of gastrin, and the receptor subtypes and pathways that promote the trophic/mitogenic effects of the different molecular forms of gastrin.

Animals↗
PubMed2006

Oncostatin M inhibits adipogenesis through the RAS/ERK and STAT5 signaling pathways.

Adipocytes play a key role in energy homeostasis and several cytokines have been shown to regulate adipogenesis. While the interleukin (IL)-6 family of cytokines was previously reported to be involved in adipogenesis, roles of this family in adipogenesis and their mechanisms of action are not fully understood. Here we show that among the IL-6 family, oncostatin M (OSM) most strongly inhibits adipogenesis of 3T3-L1 cells and mouse embryonic fibroblasts (MEFs). We also demonstrate that OSM inhibits adipogenesis through the Ras/extracellular signal-regulated kinase (ERK) and signal transducer and activator of transcription (STAT) 5 signaling pathways. In addition, OSM inhibits the early phase of the differentiation without affecting cell proliferation throughout adipogenesis including mitotic clonal expansion. CCAAT/enhancer-binding protein (C/EBP) alpha, C/EBPbeta, and peroxisome proliferator-activated receptor (PPAR) gamma are known to be required for adipogenesis. Expression of C/EBPalpha and PPARgamma was almost completely abrogated by OSM. In contrast, neither the mRNA nor protein level of C/EBPbeta was affected by OSM. Forced expression of C/EBPbeta induced differentiation in the presence of troglitazone, and OSM inhibited this C/EBPbeta-induced differentiation. Taken together, our results indicate that OSM inhibits the onset of terminal differentiation of adipocytes through the Ras/ERK and STAT5 signaling pathways by possibly regulating C/EBPbeta activity.

3T3-L1 Cells↗
PubMed1994

A role for Raf-1 in the divergent signaling pathways mediating insulin-stimulated glucose transport.

Downstream mediators of insulin signaling are thought to include multiple cytoplasmic serine/threonine kinases such as the product of the cellular proto-oncogene c-raf-1. To investigate a role for the Raf-1 protein kinase in insulin-stimulated glucose transport, a gene encoding an oncogenically activated Raf-1 mutant was introduced into 3T3-L1 fibroblasts by retroviral gene transfer. Expression of activated Raf-1 in differentiated 3T3-L1 adipocytes markedly increases hexose uptake compared to control adipocytes or those infected with the retroviral vector. Basal 2-deoxyglucose uptake in adipocytes expressing activated Raf-1 is approximately 40-fold higher than in parental adipocytes, and insulin further increases uptake about 1.2-fold. As determined by the plasma membrane "sheet" assay, Raf-1-expressing adipocytes contain greatly elevated levels of the ubiquitous glucose transporter (GLUT1) on the cell surface in the absence or presence of insulin. Total cellular GLUT1 protein is increased about 5-fold. In contrast, activated Raf-1 affects neither the expression of the "insulin-responsive" glucose transporter (GLUT4) nor its cellular distribution; GLUT4 is virtually undetectable on the plasma membrane in the absence of insulin and translocates normally following the addition of hormone. These data suggest that activation of Raf-1 mediates the chronic effect of insulin on hexose uptake but is not sufficient for the rapid translocation of GLUT4. Moreover, the differential effects of activated Raf-1 expression on the two transporter isoforms define divergent signaling pathways by which insulin regulates glucose transport in cultured adipocytes.

3T3 Cells↗
PubMed2005

Deregulation of cell-signaling pathways in HTLV-1 infection.

Human T-lymphotropic virus type 1 (HTLV-1) infection is associated with the clonal expansion and transformation of mature T lymphocytes. While the mechanisms involved are incompletely understood the viral regulatory protein Tax plays a central role in these processes. Recent studies employing genomic and proteomic approaches have demonstrated the marked complexity of gene deregulation associated with Tax expression and confirmed the remarkable pleiotropism of this protein as evidenced by the numerous Tax-cellular protein interactions in infected cells. In this review, we summarize the role of Tax in the deregulation of selected cellular-signaling pathways. Specifically, this has focused on the influence and interaction of Tax with the AP-1 and NF-AT transcription factors, PDZ domain-containing proteins, Rho-GTPases, and the Janus kinase/signal transducer and activator of transcription and transforming growth factor-beta-signaling pathways. In addition to identifying the deregulation of events within these pathways, attempts have been made to highlight differences between HTLV-1 and -2, which may relate to differences in their pathogenic properties.

Gene Expression Regulation, Viral↗
PubMed2005

Role of chemokine signaling pathways in pancreatic islet rejection during allo- and xenotransplantation.

During transplantation, pancreatic islets release chemokines promoting macrophage attraction, hampering engraftment of islets. The aim of this work was to examine the mechanism of macrophage-pancreatic islets interaction that mediates islet rejection during transplantation. Human macrophages exposed to supernates of human and porcine pancreatic islets for the allogeneic and xenogeneic models, respectively, were evaluated for chemotaxis and expression of chemokine receptors (CCR-5). To modulate migration and identify the signaling pathway of macrophages, we tested pertussis toxin (PTX) to block Gi protein, and staurosporin and wortmannin to inhibit the protein kinase, and phosphoinositol-3 kinase, respectively. The addition of these agents significantly reduced macrophage migration induced by human islet supernates from 3.2 +/- 0.5 to 1.5 +/- 0.2, 0.9 +/- 0.1, and 1 +/- 0.1, respectively (P < .001, n = 3). In a xenotransplantation model, the reduction was less decreased, from 4.1 +/- 0.4 to 2.7 +/- 0.3 (P < .01), to 2.5 +/- 0.3 (P < .01), or to 1 +/- 0.1 (P < .001). Western blot analysis of chemokine receptor expression showed increased CCR-5 expression with human pancreatic islet supernates. Moreover, decreased islet purity increased CCR-5 expression. Pharmacologic study showed that PTX induced an increase in CCR-5 expression in allogeneic transplantation, whereas only staurosporin induced an increased receptor expression in the xenogeneic model, suggesting that chemokines participate in islet rejection even though the chemokine signaling pathways differ between allo- and xenotransplantation. Understanding the molecular mechanisms of islet rejection may improve graft survival.

Adult↗
PubMed2002

Signaling pathways in vascular development.

The vasculature is one of the most important and complex organs in the mammalian body. The first functional organ to form during embryonic development, the intricately branched network of endothelial and supporting periendothelial cells is essential for the transportation of oxygen and nutrients to and the removal of waste products from the tissues. Serious disruptions in the formation of the vascular network are lethal early in post-implantation development, while the maintenance of vessel integrity and the control of vessel physiology and hemodynamics have important consequences throughout embryonic and adult life. A full understanding of the signaling pathways of vascular development is important not just for understanding normal development but because of the importance of reactivation of angiogenic pathways in disease states. Clinically there is a need to develop therapies to promote new blood vessel formation in situations of severe tissue ischemia, such as coronary heart disease. In addition, there is considerable interest in developing angiogenic inhibitors to block the new vessel growth that solid tumors promote in host tissue to enhance their own growth. Already studies on the signaling pathways of normal vascular development have provided new targets for therapeutic intervention in both situations. Further understanding of the complexities of the pathways should help refine such strategies.

Animals↗
PubMedDate not supplied

Signaling pathways in thrombin-induced actin reorganization in pulmonary artery endothelial cells.

The actin-based cytoskeleton of endothelial cells plays an important role in regulating cell function. Both thrombin and phorbol 12-myristate 13-acetate (PMA) (an activator of protein kinase C; PKC) cause rearrangement of actin and increased permeability of endothelial monolayers. Conversely, thrombin, but not PMA, induces phosphorylation of myosin light chains (MLC), a process considered essential for cellular contraction. We, therefore, decided to investigate which signaling pathways are involved in thrombin-induced actin reorganization in pulmonary artery endothelial cells. Thrombin induced a rapid and transient increase in cytoskeletal actin that paralleled MLC phosphorylation. Antagonism of the Ca(2+)-binding protein, calmodulix (CaM), or inhibition of the CaM-dependent MLC kinase (MLCK) abolished the elevation in cytoskeletal actin whereas inhibition of PKC did not. In contrast, PMA decreased cytoskeleton-associated actin without affecting phosphorylation of MLC. A23187, a Ca(2+)- ionophore, or thapsigargin, an inhibitor of endoplasmic Ca(2+)-ATPase, either in the presence or absence of PMA, did not increase cytoskeletal actin. Therefore, increased intracellular Ca2+, even with concurrent activation of PKC, is insufficient for redistribution of actin to the cytoskeleton, indicating that thrombin recruits yet another signaling pathway. Both thrombin and PMA caused extensive rearrangement of filamentous actin with a disappearance of the dense peripheral band and an increase in stress fibers, but each agent induced a distinct morphology. Thrombin-induced rearrangement of actin filaments was attenuated by inhibitors of either PKC or MLCK. These data suggest that both PKC- and MLCK-dependent pathways are involved in thrombin-induced endothelial cell actin rearrangement, but that recruitment of actin to the cytoskeleton is not necessary for this rearrangement. Recruitment of actin and myosin to the cytoskeleton does not require PKC but does involve MLCK-catalyzed phosphorylation of MLC.

Actins↗
PubMed2004

Antagonistic interaction between abscisic acid and jasmonate-ethylene signaling pathways modulates defense gene expression and disease resistance in Arabidopsis.

The plant hormones abscisic acid (ABA), jasmonic acid (JA), and ethylene are involved in diverse plant processes, including the regulation of gene expression during adaptive responses to abiotic and biotic stresses. Previously, ABA has been implicated in enhancing disease susceptibility in various plant species, but currently very little is known about the molecular mechanisms underlying this phenomenon. In this study, we obtained evidence that a complex interplay between ABA and JA-ethylene signaling pathways regulate plant defense gene expression and disease resistance. First, we showed that exogenous ABA suppressed both basal and JA-ethylene-activated transcription from defense genes. By contrast, ABA deficiency as conditioned by the mutations in the ABA1 and ABA2 genes, which encode enzymes involved in ABA biosynthesis, resulted in upregulation of basal and induced transcription from JA-ethylene responsive defense genes. Second, we found that disruption of AtMYC2 (allelic to JASMONATE INSENSITIVE1 [JIN1]), encoding a basic helix-loop-helix Leu zipper transcription factor, which is a positive regulator of ABA signaling, results in elevated levels of basal and activated transcription from JA-ethylene responsive defense genes. Furthermore, the jin1/myc2 and aba2-1 mutants showed increased resistance to the necrotrophic fungal pathogen Fusarium oxysporum. Finally, using ethylene and ABA signaling mutants, we showed that interaction between ABA and ethylene signaling is mutually antagonistic in vegetative tissues. Collectively, our results indicate that the antagonistic interactions between multiple components of ABA and the JA-ethylene signaling pathways modulate defense and stress responsive gene expression in response to biotic and abiotic stresses.

Abscisic Acid↗
PubMed1999

ebi regulates epidermal growth factor receptor signaling pathways in Drosophila.

ebi regulates the epidermal growth factor receptor (EGFR) signaling pathway at multiple steps in Drosophila development. Mutations in ebi and Egfr lead to similar phenotypes and show genetic interactions. However, ebi does not show genetic interactions with other RTKs (e.g., torso) or with components of the canonical Ras/MAP kinase pathway. ebi encodes an evolutionarily conserved protein with a unique amino terminus, distantly related to F-box sequences, and six tandemly arranged carboxy-terminal WD40 repeats. The existence of closely related proteins in yeast, plants, and humans suggests that ebi functions in a highly conserved biochemical pathway. Proteins with related structures regulate protein degradation. Similarly, in the developing eye, ebi promotes EGFR-dependent down-regulation of Tramtrack88, an antagonist of neuronal development.

Amino Acid Sequence↗
PubMed2004

Role of the Toll/interleukin-1 receptor signaling pathway in host resistance and pathogenesis during infection with protozoan parasites.

Different studies have illustrated the activation of the innate immune system during infection with protozoan parasites. Experiments performed in vivo also support the notion that innate immunity has a crucial role in resistance as well as pathogenesis observed during protozoan infections such as malaria, leishmaniasis, toxoplasmosis, and trypanosomiasis. While major advances have been made in the assignment of bacterial molecules as Toll-like receptors (TLRs) agonists as well as defining the role of the Toll/interleukin-1 receptor (TIR) signaling pathway in host resistance to bacterial infection, this research area is now emerging in the field of protozoan parasites. In this review, we discuss the recent studies describing parasite molecules as TLR agonists and those studies indicating the essential role of the TIR-domain bearing molecule named myeloid differentiation factor 88 in host resistance to infection with protozoan parasites. Together, these studies support the hypothesis that the TIR signaling pathway is involved in the initial recognition of protozoan parasites by the immune system of the vertebrate host, early resistance to infection, development of acquired immunity, as well as pathology observed during acute infection with this class of pathogens.

Animals↗
PubMed2006

Neurotrophin-regulated signalling pathways.

Neurotrophins are a family of closely related proteins that were identified initially as survival factors for sensory and sympathetic neurons, and have since been shown to control many aspects of survival, development and function of neurons in both the peripheral and the central nervous systems. Each of the four mammalian neurotrophins has been shown to activate one or more of the three members of the tropomyosin-related kinase (Trk) family of receptor tyrosine kinases (TrkA, TrkB and TrkC). In addition, each neurotrophin activates p75 neurotrophin receptor (p75NTR), a member of the tumour necrosis factor receptor superfamily. Through Trk receptors, neurotrophins activate Ras, phosphatidyl inositol-3 (PI3)-kinase, phospholipase C-gamma1 and signalling pathways controlled through these proteins, such as the MAP kinases. Activation of p75NTR results in activation of the nuclear factor-kappaB (NF-kappaB) and Jun kinase as well as other signalling pathways. Limiting quantities of neurotrophins during development control the number of surviving neurons to ensure a match between neurons and the requirement for a suitable density of target innervation. The neurotrophins also regulate cell fate decisions, axon growth, dendrite growth and pruning and the expression of proteins, such as ion channels, transmitter biosynthetic enzymes and neuropeptide transmitters that are essential for normal neuronal function. Continued presence of the neurotrophins is required in the adult nervous system, where they control synaptic function and plasticity, and sustain neuronal survival, morphology and differentiation. They also have additional, subtler roles outside the nervous system. In recent years, three rare human genetic disorders, which result in deleterious effects on sensory perception, cognition and a variety of behaviours, have been shown to be attributable to mutations in brain-derived neurotrophic factor and two of the Trk receptors.

Animals↗
PubMed2003

Virulence systems of Pseudomonas syringae pv. tomato promote bacterial speck disease in tomato by targeting the jasmonate signaling pathway.

Pseudomonas syringae pv. tomato strain DC3000 (Pst DC3000) causes bacterial speck disease on tomato. The pathogenicity of Pst DC3000 depends on both the type III secretion system that delivers virulence effector proteins into host cells and the phytotoxin coronatine (COR), which is thought to mimic the action of the plant hormone jasmonic acid (JA). We found that a JA-insensitive mutant (jai1) of tomato was unresponsive to COR and highly resistant to Pst DC3000, whereas host genotypes that are defective in JA biosynthesis were as susceptible to Pst DC3000 as wild-type (WT) plants. Treatment of WT plants with exogenous methyl-JA (MeJA) complemented the virulence defect of a bacterial mutant deficient in COR production, but not a mutant defective in the type III secretion system. Analysis of host gene expression using cDNA microarrays revealed that COR works through Jai1 to induce the massive expression of JA and wound response genes that have been implicated in defense against herbivores. Concomitant with the induction of JA and wound response genes, the type III secretion system and COR repressed the expression of pathogenesis-related (PR) genes in Pst DC3000-infected WT plants. Resistance of jai1 plants to Pst DC3000 was correlated with a high level of PR gene expression and reduced expression of JA/wound response genes. These results indicate that COR promotes bacterial virulence by activating the host's JA signaling pathway, and further suggest that the type III secretion system might also modify host defense by targeting the JA signaling pathway in susceptible tomato plants.

Amino Acids↗
PubMed1998

Involvement of p38 mitogen-activated protein kinase signaling pathway in the rapid induction of the 78-kDa glucose-regulated protein in 9L rat brain tumor cells.

We have previously shown that treatment with okadaic acid (OA) followed by heat shock (HS) (termed OA --> HS treatment) leads to rapid transactivation of the 78-kDa glucose-regulated protein gene (grp78) in 9L rat brain tumor cells. A cAMP-responsive element-like (CRE-like, TGACGTGA) promoter sequence and a protein kinase A signaling pathway are involved in this induction, and activation of both CRE binding protein (CREB) and activating transcription factor-2 (ATF-2) is required in the above process. Herein, we report that transactivation of grp78, as well as phosphorylation/activation of ATF-2, can be completely annihilated by SB203580, a highly specific inhibitor of p38 mitogen-activated protein kinase (p38(MAPK)). Activation of p38(MAPK) by OA --> HS is also substantiated by its own phosphorylation as well as the phosphorylation and activation of MAPK activating protein kinase-2 in cells subjected to this treatment. The involvement of p38(MAPK) in the activation of ATF-2, which leads to the transactivation of rat grp78, is confirmed by electrophoretic mobility shift assay using a probe containing the CRE-like sequence as well as by transient transfection assays with a plasmid containing a 710-base pair stretch of the grp78 promoter. Together with our previous studies, these results led us to conclude that phosphorylation/activation of CREB upon OA --> HS treatment is mediated by cAMP-dependent protein kinase, whereas that of ATF-2 is mediated by p38(MAPK). The transcription factors may bind to each other to form heterodimers that in turn transactivate grp78 by binding to the CRE-like element. This suggests that distinct signaling pathways converge on CREB-ATF-2, where each subunit is individually activated by a specific class of protein kinases. This may allow modulation of grp78 transactivation by diverse external stimuli.

Animals↗
PubMed2006

Physicochemical modelling of cell signalling pathways.

Physicochemical modelling of signal transduction links fundamental chemical and physical principles, prior knowledge about regulatory pathways, and experimental data of various types to create powerful tools for formalizing and extending traditional molecular and cellular biology.

Algorithms↗
PubMedDate not supplied

A novel mitochondrial signaling pathway activated by visible-to-near infrared radiation.

The number of cells attached to glass substratum increases if HeLa cell suspension is irradiated with monochromatic visible-to-near infrared radiation before plating (the action spectrum with maxima at 619, 657, 675, 700, 740, 760, 800, 820, 840 and 860 nm). Treating of cell suspension with sodium azide (2 x 10(-5) M), sodium nitroprusside (5 x 10(-5) M), ouabain (1 x 10(-6) M) or amiloride (1.7 x 10(-5) M) before irradiation significantly modifies the spectrum of cell attachment enhancement. A light-induced mitochondrial signaling pathway can be regulated by small ligands directly binding to the catalytic center of cytochrome c oxidase (N(3), NO) as well as by chemicals specifically binding to plasma membrane enzymes (ouabain, amiloride). The comparative analysis of action spectra allows the conclusions that first, Cu(A) and Cu(B) chromophores of cytochrome c oxidase could be involved as photoacceptors and second, various signaling pathways (reaction channels) between cytochrome c oxidase and cell attachment regulation are at work.

Cell Adhesion↗
PubMed2004

SU5416 inhibited VEGF and HIF-1alpha expression through the PI3K/AKT/p70S6K1 signaling pathway.

Ovarian cancer has the highest mortality rate of any gynecological disease affecting women in Western countries. VEGF is a crucial inducer of angiogenesis both in vivo and in vitro. VEGF is commonly upregulated in ovarian cancer and is regulated by HIF-1. SU5416 is known to inhibit various stages of tumor growth. In this study, we show that SU5416 inhibited VEGF mRNA expression in ovarian cancer cells in a dose-dependent manner. SU5416 inhibited VEGF expression at the transcriptional level through the HIF-1 DNA binding site. HIF-1 is composed of HIF-1alpha and HIF-1beta subunits. SU5416 specifically decreased HIF-1alpha, but not HIF-1beta protein levels. To understand the signaling pathways regulating SU5416-inhibited VEGF and HIF-1alpha expression, we found that SU5416 inhibited PI3K activity. AKT is a downstream target of PI3K. We found that SU5416 also inhibited AKT and p70S6K1 activation and activity in a dose-dependent manner. These results demonstrate that SU5416 inhibited VEGF and HIF-1alpha expression through the inhibition of PI3K/AKT/p70S6K1 pathway in ovarian cancer cells. These results indicate that SU5416 may be an effective agent for ovarian cancer treatment through the inhibition of VEGF and HIF-1 expression, and the activation of PI3K/AKT/p70S6K1 signaling pathway.

Binding Sites↗