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RESEARCH PRODUCT
Rottlerin induces a transformed phenotype in human keratinocytes.
Nicolas GumpertCornelia DietrichR.j. WieserFranz OeschIsabelle HeitMonika Borchert-stuhlträgersubject
Keratinocytesmedia_common.quotation_subjectCellBiophysicsBiologyBiochemistryCell Linechemistry.chemical_compoundmedicineCell AdhesionHumansBenzopyransEnzyme InhibitorsProtein kinase AInternalizationMolecular BiologyProtein Kinase Cbeta Cateninmedia_commonintegumentary systemContact InhibitionAcetophenonesCell DifferentiationCell BiologyTransfectionCadherinsPhenotypeMolecular biologyCell biologyIsoenzymesHaCaTCytoskeletal ProteinsProtein Kinase C-deltamedicine.anatomical_structureCell Transformation NeoplasticPhenotypechemistryCell cultureTrans-ActivatorsRottlerindescription
PKCdelta plays a fundamental role in cell cycle control. Consistent with its proposed tumour suppressor function, ras transfection of the human keratinocyte cell line HaCaT results in a loss of PKCdelta expression mediated by TGFalpha (Exp. Cell Res., 219, 299, 1995). To get more insight into the role of PKCdelta in keratinocytes, we investigated the effects of Rottlerin, a specific inhibitor of protein kinase Cdelta, in HaCaT cells. After Rottlerin treatment, HaCaT cells lost their cobble-stone morphology and displayed a spindle-shaped, fibroblastic phenotype. Additionally, the establishment of cell-cell contacts was prevented. This was caused by an internalization of E-cadherin and beta-catenin as assessed by immunofluorescence. A similar phenotype was observed in the presence of a neutralizing anti-E-cadherin antibody. Rottlerin-treated HaCaT cells proliferated like transformed cells in a three-dimensional cell culture system. We therefore conclude that PKCdelta is involved in mediating cell-cell contacts via E-cadherin and hence regulates differentiation in HaCaT cells.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2001-03-01 | Biochemical and biophysical research communications |