0000000000859269

AUTHOR

Isabelle Heit

showing 2 related works from this author

Involvement of protein kinase Cdelta in contact-dependent inhibition of growth in human and murine fibroblasts.

2001

There is evidence that protein kinase C delta (PKCdelta) is a tumor suppressor, although its physiological role has not been elucidated so far. Since important anti-proliferative signals are mediated by cell-cell contacts we studied whether PKCdelta is involved in contact-dependent inhibition of growth in human (FH109) and murine (NIH3T3) fibroblasts. Cell-cell contacts were imitated by the addition of glutardialdehyde-fixed cells to sparsely seeded fibroblasts. Downregulation of the PKC isoforms alpha, delta, epsilon, and mu after prolonged treatment with 12-O-tetradecanoylphorbol-13-acetate (TPA, 0.1 microM) resulted in a significant release from contact-inhibition in FH109 cells. Bryosta…

Cancer ResearchTime FactorsBryostatin 1ImmunoprecipitationActive Transport Cell NucleusDown-RegulationBiologychemistry.chemical_compoundFixativesLactonesMiceDownregulation and upregulationGeneticsmedicineAnimalsHumansProtein IsoformsBenzopyransEnzyme InhibitorsFibroblastProtein kinase AMolecular BiologyProtein kinase CProtein Kinase CChemotaxisCell CycleAcetophenones3T3 CellsFibroblastsBryostatinsMolecular biologyBlotIsoenzymesProtein Kinase C-deltamedicine.anatomical_structurechemistryGlutaralTetradecanoylphorbol AcetateMacrolidesMitogensRottlerinCell DivisionProtein BindingOncogene
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Rottlerin induces a transformed phenotype in human keratinocytes.

2001

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-c…

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-ActivatorsRottlerinBiochemical and biophysical research communications
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