The open cell signaling journal最新文献

{"title":"Pleiotropic Effect of Aldosterone on Human Endothelial Cells In Vitro","authors":"P. Mirshahi, A. Berthaut, E. Ducros, J. Soria, M. Agarwal, M. Mirshahi","doi":"10.2174/1876390101204010001","DOIUrl":"https://doi.org/10.2174/1876390101204010001","url":null,"abstract":"Aim: To investigate the effect of aldosterone and its antagonists on cell behavior and gene modulation in human endothelial cells. Methods and Results: Exposure of HBMEC to 100 nM aldosterone reduced the subsequent organization and assembly of cells into capillary-like networks, capillary length and cell multiplication but cell migration to the wound edge was not affected by the agonist. Eplerenone (400 nM) partially reversed the inhibitory effect of the agonist on capillary length, the number of capillary networks, as well as cell multiplication; the antagonist also inhibited the migration of HBMEC in a wound healing assay. Aldactone was more potent than eplerenone in most of the tests, due possibly to the fact that the former derivative is not specific to the MCR but activates other classes of steroid receptors as well. Transcriptional modulation by aldosterone was analyzed using a gene array technique that screened 1800 genes related to cytokines, monokines, growth factors, angiogenic effectors, cell metabolism, growth and malignant transformation. Evidence is provided here for the simultaneous upregulation of 36 mRNAs, and concurrent downregulation of 29 mRNAs, in endothelial cells exposed for 8 h to 100 nM aldosterone. Conclusions: Aldosterone inhibits cell migration, network formation, and cell proliferation in vitro, possibly via a pleiotropic effect on transcription modulation in human endothelial cells.","PeriodicalId":89635,"journal":{"name":"The open cell signaling journal","volume":"4 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2012-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68129042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interplay of Bcl-2 Proteins Decides the Life or Death Fate","authors":"G. Dewson","doi":"10.2174/1876390101103010003","DOIUrl":"https://doi.org/10.2174/1876390101103010003","url":null,"abstract":"Ever since the discovery that the founding member of the Bcl-2 family of proteins contributes to tumour development by inhibiting cell survival rather than encouraging proliferation (1), interest (and controversy) in these functionally diverse homologues has raged. The Bcl-2 family of proteins participate in multiple protein-protein interactions that govern whether a cell dies in response to toxic stress. This review summarises the current knowledge of how a death stimulus culminates in the activation of Bax and Bak, the pivotal effectors of the apoptotic program, and how these critical proteins cause damage to mitochondria and the consequent demise of a cell.","PeriodicalId":89635,"journal":{"name":"The open cell signaling journal","volume":"3 1","pages":"3-8"},"PeriodicalIF":0.0,"publicationDate":"2011-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68127626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dying for Something to Eat: How Cells Respond to Starvation","authors":"A. Caro-Maldonado, C. Muñoz-Pinedo","doi":"10.2174/1876390101103010042","DOIUrl":"https://doi.org/10.2174/1876390101103010042","url":null,"abstract":"Food is a requirement of life. Unicellular and multicellular organisms have therefore developed mechanisms to detect, react to and, if necessary, survive the lack of it. In mammals, responses to lack of nutrients in blood are coordinated at the organismal level by hormonal cues. However, individual cells also sense and respond to nutrient deprivation, which occurs under physiological or pathological situations such as fasting, ischemia or solid tumor development. Frequently cells try and survive nutrient deprivation by reducing their energy and carbon requirements and by recycling structural components. However, under certain conditions, the cell reacts to nutrient deprivation by engaging the mitochondrial pathway of apoptosis. Indeed, the metabolic state of the cell can regulate pro- and antiapoptotic Bcl-2 family proteins such as PUMA, Bad, Bim or Mcl-1, thus altering the response to pro-apoptotic stimuli. Severe energetic stress can also kill cells by a form of death with necrotic phenotype. Metabolic pathways are currently receiving enormous attention from cell biologists, due to the fact that tumors have a special metabolism which makes them more susceptible to lack of specific nutrients, particularly glucose and glutamine. For this reason, targeting tumor metabolism opens new therapeutic avenues. We will discuss how nutrient deprivation engages cell death pathways, and how cell metabolism interferes with the apoptotic machinery by regulating apoptotic proteins. We will also re-examine the hypothesis that ATP levels determine whether a cell dies by apoptosis or necrosis. Finally, we will discuss how and why metabolic stress can lead to either cell adaptation and survival or cell death.","PeriodicalId":89635,"journal":{"name":"The open cell signaling journal","volume":"3 1","pages":"42-51"},"PeriodicalIF":0.0,"publicationDate":"2011-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68128717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual Philosophy in Death Receptor Signalling","authors":"C. Kantari, H. Walczak","doi":"10.2174/1876390101103010027","DOIUrl":"https://doi.org/10.2174/1876390101103010027","url":null,"abstract":"Tumour necrosis factor (TNF) is the founding member of a cytokine family with important roles in both, physiology and pathological conditions. The two seemingly opposing cellular responses to stimulation by TNF itself are death and induction of pro-inflammatory signalling. TNF and other TNF superfamily (SF) members signal by crosslinking their cognate receptors. These form part of the TNF receptor SF (TNFRSF). Members of this family have between two and six characteristic cysteine-rich repeats in their extracellular domain. These repeats are crucial for receptor-ligand interaction. Members of the TNFRSF come in three flavours: as type I transmembrane proteins, attached to the plasma membrane by a glycosylphosphatidylinositol (GPI) anchor, or as secreted soluble proteins. The latter receptors act as decoys for their respective ligands. To date 30 members of the TNFRSF are known. Six of them form part of the subfamily of the death receptors. Death receptors are characterised by the presence of an intracellular death domain (DD). Amongst the death receptors there are again at least two subclasses, the ones which recruit the Fas-Associated Death Domain (FADD) and the ones that recruit the TNFR-Associated Death Domain (TRADD) protein. The primary function of FADD-recruiting receptors is to induce apoptosis whilst the primary function of the TRADD recruiters is to activate pro-inflammatory signalling (Fig. 1). However, from a second platform both systems are also capable of triggering the respective other signalling outcome.","PeriodicalId":89635,"journal":{"name":"The open cell signaling journal","volume":"3 1","pages":"27-34"},"PeriodicalIF":0.0,"publicationDate":"2011-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68127675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cytokine Deprivation and Cell Death","authors":"P. Ekert, A. Jabbour","doi":"10.2174/1876390101103010020","DOIUrl":"https://doi.org/10.2174/1876390101103010020","url":null,"abstract":"It has long been known that many cell types are dependent on specific cytokines that signal proliferation, regulate differentiation and suppress apoptosis. A detailed picture of the structure of several cytokine receptors has added to our understanding of the molecular mechanism of receptor activation. An explosion of knowledge of apoptosis pathways and the ways in which the Bcl-2 family of proteins function has deepened the understanding of the effector arm of the programmed cell death pathway. The challenge is to uncover the molecular links between these two pathways. In this article, we will try to examine what is known of the intersections between cytokine signalling pathways and apoptosis pathways, with particular reference to receptor signalling by the haematopoietic cytokines Interleukin-3 (IL-3) and Granulocyte-Macrophage-Colony Stimulating Factor (GM-CSF). IL-3 AND GM-CSF IL-3 and GM-CSF are haematopoietic cytokines involved in normal haematopoiesis, including the maintenance and proliferation of myeloid progenitor cells and regulation mye- loid differentiation (1). GM-CSF and IL-3 have important physiological roles and deregulated signalling contributes to a number of human diseases. In normal physiology, GM- CSF and IL-3 signalling are not required for the develop- ment of a functioning haematopoietic system, but are impor- tant in the expansion or repopulation of certain haematopoie- tic lineages in response to infection or cytopenias, for example after treatment with chemotherapeutic agents (2, 3). This property underpins the most striking clinical application of GM-CSF (and now more commonly G-CSF) to enhance granulopoiesis after chemotherapy (reviewed in (4)). In Acute Myeloid Leukaemia (AML), overexpression of the IL- 3 receptor alpha chain ( chain or CD123) is observed in a subset of leukaemias and is associated with a worse prognosis (5). Whilst the biological mechanisms by which overexpression of this receptor subunit contributes to the progression of AML remain to be determined, the potential of the  chain as a therapeutic target, particularly to attack leukaemic stem cells, is being actively explored (6). The proinflammatory functions of GM-CSF, IL-3 as well as other cytokines may contribute to a number of chronic inflammatory diseases, including arthritis (7). At least in animal models, depletion or blocking GM-CSF signalling can substantially lessen disease severity, although this has not yet translated into an established therapeutic option in humans.","PeriodicalId":89635,"journal":{"name":"The open cell signaling journal","volume":"3 1","pages":"20-26"},"PeriodicalIF":0.0,"publicationDate":"2011-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68127661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Prickly Subject: Apoptotic Regulation by Hedgehog Morphogens","authors":"M. Ditzel","doi":"10.2174/1876390101103010009","DOIUrl":"https://doi.org/10.2174/1876390101103010009","url":null,"abstract":"Morphogens, as intercellular signalling proteins, provide a non-cell-autonomous mechanism to impart positional information to cells and govern essential cellular processes such as apoptosis. Individual morphogen pathways utilise diverse strategies to regulate the assembly and activity of the pro-apoptotic multi-protein complexes 阂 namely the apoptosome and the death-inducing signalling complex (DISC). This review aims to highlight the apoptotic regulatory mechanisms utilised by the Hedgehog (HH) morphogen pathway 阂 with particular emphasis on a novel Caspase-9 activating complex and the utilisation of a pro-apoptotic autocrine-signalling loop.","PeriodicalId":89635,"journal":{"name":"The open cell signaling journal","volume":"3 1","pages":"9-19"},"PeriodicalIF":0.0,"publicationDate":"2011-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68127982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Importance of CDK7 for G1 Re-Entry into the Mammalian Cell Cycle and Identification of New Downstream Networks Using a Computational Method","authors":"H. Sone, Tomokazu Fukuda, H. Toyoshiba, T. Yamanaka, F. Parham, C. Portier","doi":"10.2174/1876390101002010001","DOIUrl":"https://doi.org/10.2174/1876390101002010001","url":null,"abstract":"Many of the key molecules in cell cycle progression (e.g. pRB, cyclin complexes) and their basic interactions are oncogene or tumor suppressor genes, which are well characterized in the clinical and experimental analysis. However, there are still unknown mechanisms for the cell cycle regulation, which is critical step for the progression of the cancer development. Especially it is not fully understood how the cells move to G1 phase from quiescent G0 phase in the mammalian cells. To find out the new gene networks associated with the two transition of the mammalian cell cycle (G0 to G1 and G1 to S phase), we analyzed the linkages between 39 representative oncogene or tumor suppressor genes, which related to the cell cycle regulation, with gene expression sets obtained from the publicly opened microarray data for mouse embryonic fibroblasts that synchronized by the serum starvation or hydroxyurea treatment. Analyses with a qualitative algorithm based on Bayesian networks that assume a log-linear relationship between genes have applied, and newly found networks were validated. Results highlighted the importance of two master genes, Cdk7 and Cdkna2 for the re-entry to G1 from G0, and suggested a new network connection from Cdk7 to downstream molecules, including the EGF receptor and N-myc. Introduction of a recombinant Cdk7 with retrovirus decreased endogenous EGFR and N-myc protein levels. The results supported the computational prediction of the Cdk7 network. Taken together, these result showed the existence of new regulating pathway from Cdk7 to Egfr and N-myc, suggesting this analytical approach provides an assessment of regulatory networks in complex mammalian cells, and the process of the carcinogenesis.","PeriodicalId":89635,"journal":{"name":"The open cell signaling journal","volume":"2 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2010-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68127611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}