title: [On the role of transcription factor family AP-2 for development and disease--lessons from mouse models].
abstract: To analyze the consequence of ,gain of function' and ,loss of function' of transcription factor AP-2gamma in mice Using pronuclear injection, mice harbouring a mammary gland specific transgene were established and analyzed. Constitutive and conditional knockout mice complement the analysis, showing the consequences of loss of function for specific tissues. Gain of AP-2 expression on it's own in mammary gland results in enhanced proliferation which is compensated by accelerated apoptosis. Only after mating with a second transgenic mouseline, the MMTV-ErbB2 oncomouse model, an effect on tumor progression was observed. Hence, AP-2 might influence progression, but not initiation of mammary tumors. Knockout mouse models reveal that AP-2gamma is essential for the extraembryonic cells indicating a role for trophoblast cell lineage These and other studies indicate that AP-2gamma might be a molecule which enables proliferation of undifferentiated precursors or transient amplifying cells. Reexpression in tumors correlates with dedifferentiation and progression.
authors.affiliation: H. Schorle Institut für Pathologie, Abteilung für Entwicklungspathologie, Universitäitsklinikum Bonn.
authors.forename: H
authors.initials: H
authors.lastname: Schorle
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D015674:Mammary Neoplasms, Animal / Q000235:genetics*; D051379:Mice; D008822:Mice, Transgenic; D050656:Transcription Factor AP-2 / Q000235:genetics*
chemical_list: D050656:Transcription Factor AP-2