title: Entamoeba histolytica: collagen-induced AP-1 DNA binding activity.
abstract: The interaction of Entamoeba histolytica trophozoites with collagen induces the synthesis and release of electron-dense granules containing a collagenase activity that is an important factor in the pathogenicity of the parasite. The binding is thought to be mediated by an 'integrin-like' collagen receptor. In the signal transduction mechanisms activated by collagen, pp125FAK and p42MAPK are involved. Using immunoprecipitation assays coupled to Western blot analysis, we demonstrate here the collagen-dependent association of paxillin and Src with pp125FAK. Furthermore, collagen induces a time-dependent increase in the DNA binding activity of the activator protein 1, which is well correlated with an increase in Fos expression. Our results suggest that a stimulus-transcription coupling triggered by collagen in E. histolytica trophozoites might activate or repress genes involved in tissue invasiveness.
authors.affiliation: Departamento de Genética y Biologia Molecular, CINVESTAV-IPN, México DF, Mexico.
authors.forename: E
authors.initials: E
authors.lastname: Pérez
authors.forename: M L
authors.initials: ML
authors.lastname: Muñoz
authors.forename: A
authors.initials: A
authors.lastname: Ortega
mesh_terms: D000818:Animals; D015815:Cell Adhesion Molecules / Q000378:metabolism; D003094:Collagen / Q000494:pharmacology*; D003598:Cytoskeletal Proteins / Q000378:metabolism; D004247:DNA / Q000378:metabolism*; D004748:Entamoeba histolytica / Q000378:metabolism*; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; D051419:Paxillin; D010750:Phosphoproteins / Q000378:metabolism; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D015398:Signal Transduction; D018808:Transcription Factor AP-1 / Q000378:metabolism*
chemical_list: D015815:Cell Adhesion Molecules; D003598:Cytoskeletal Proteins; D051419:Paxillin; D010750:Phosphoproteins; D018808:Transcription Factor AP-1; D003094:Collagen; D004247:DNA; D011505:Protein-Tyrosine Kinases; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases