Gene Set: BIOCARTA_EPHA4_PATHWAY

Standard name BIOCARTA_EPHA4_PATHWAY
Systematic name M16334
Brief description Eph Kinases and ephrins support platelet aggregation
Full description or abstract Eph kinases are a family of receptor tyrosine kinases with an extracellular domain that binds their ligand, the ephrins, and an intracellular kinase domain. The ephrins are also expressed on the cell surface, so that interaction between Eph kinases and ephrins occurs at the interface between neighboring cells. Binding of ephrins to Eph kinases stimulates signaling in both directions across the interface between cells, in both the receptor expressing and the ligand expressing cells. Eph kinases and ephrins are involved in several biological processes, and their role in neuronal development has been extensively examined. Both Eph kinases (EphA4 and EphB1) and ephrins (ephrinB1) are expressed on platelets, suggesting activation of eph kinases by ephrins may play a role in clotting when platelets are brought into close proximity in the developing clot. Platelet activation progresses in stages with an early stage that is stimulated by soluble factors like ADP acting through GPCRs and is reversible and later stages with stronger interaction between platelets that may require interact between Eph kinases and ephrins. One of the molecular targets of signaling by Eph kinases and ephrins is the actin cytoskeleton, which also plays a role in platelet activation. Clustering Eph kinases or ephrins in platelets stimulated cytoskeletal changes as well as other markers of platelet activation during clotting such as secretion of alpha-granules to release clotting factors. Clustering ephrins together activated Rap1b, a ras gene family member that may regulate integrins. Platelet activation caused Eph kinases to bind to src family members Fyn and Lyn and also with the cell adhesion molecule L1. Failure of the ephrins/Eph kinase pathway to function normally in platelets may result in loosely associated platelets and improper clot formation. Eph kinases and ephrins are also expressed on the vascular wall by endothelial cells, suggesting that signaling by these proteins may also play a role in the interaction of platelets with the vascular wall and clot formation in the vasculature.
Collection C2: curated gene sets
      CP: canonical pathways
            CP:BIOCARTA: BioCarta gene sets
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External links http://www.biocarta.com/pathfiles/h_ephA4Pathway.asp
http://www.biocarta.com/pathfiles/PathwayProteinList.asp?showPFID=512
Organism Homo sapiens
Contributed by BioCarta
Source platform EntrezGeneIds
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Compute overlaps C1: positional gene sets
C2: curated gene sets
      CGP: chemical and genetic perturbations
      CP: canonical pathways
            CP:BIOCARTA: BioCarta gene sets
            CP:KEGG: KEGG gene sets
            CP:REACTOME: Reactome gene sets
C3: motif gene sets
      MIR: microRNA targets
      TFT: transcription factor targets
C4: computational gene sets
      CGN: cancer gene neighborhoods
      CM: cancer modules
C5: GO gene sets
      BP: GO biological process
      CC: GO cellular component
      MF: GO molecular function
Compendia expression profiles Human tissue compendium (Novartis)
Global Cancer Map (Broad Institute)
NCI-60 cell lines (National Cancer Institute)
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