title: Expression and regulation of phospholipase D in the human keratinocyte cell line HaCaT.
abstract: The generation of lipid second messengers via phosphatidylcholine (PC)-specific phospholipase D (PLD) has emerged as an important step leading to transduction of extracellular signals. In the present investigation the expression of human cytosolic PLD isoenzymes in the immortalized human keratinocyte cell line HaCat was determined. At the mRNA level we found the expression of hPLD1b and for the first time in human cells also the expression of hPLD2. For further analysis of enzyme expression at the protein level, hPLD1 peptide fragments were synthesized and specific antibodies were generated (rabbit) to be used for detection of hPLD1 in Western blot experiments. Furthermore, small G-proteins were found to be involved in the regulation of PLD activity in HaCaT cells using the guanine nucleotide analogue GTPgammaS.
authors.affiliation: Department of Dermatology, University Medical Center Benjamin Franklin, The Free University of Berlin, Germany.
authors.forename: V
authors.initials: V
authors.lastname: Müller-Wieprecht
authors.forename: C
authors.initials: C
authors.lastname: Riebeling
authors.forename: C
authors.initials: C
authors.lastname: Alexander
authors.forename: F R
authors.initials: FR
authors.lastname: Scholz
authors.forename: A
authors.initials: A
authors.lastname: Höer
authors.forename: T
authors.initials: T
authors.lastname: Wieder
authors.forename: C E
authors.initials: CE
authors.lastname: Orfanos
authors.forename: C C
authors.initials: CC
authors.lastname: Geilen
mesh_terms: D000818:Animals; D000906:Antibodies / Q000276:immunology; D005786:Gene Expression Regulation / Q000187:drug effects; D016244:Guanosine 5'-O-(3-Thiotriphosphate) / Q000378:metabolism / Q000494:pharmacology; D006801:Humans; D015603:Keratinocytes / Q000378:metabolism*; D010739:Phospholipase D / Q000235:genetics* / Q000276:immunology; D012333:RNA, Messenger / Q000378:metabolism; D011817:Rabbits
chemical_list: D000906:Antibodies; D012333:RNA, Messenger; D016244:Guanosine 5'-O-(3-Thiotriphosphate); C105606:phospholipase D2; D010739:Phospholipase D; C106801:phospholipase D1