title: Up-regulation of the T cell quiescence factor KLF2 in a leukaemic T-cell line after expression of the inositol 5'-phosphatase SHIP-1.
abstract: Inositol 5'-phosphatase SHIP-1 (SHIP) is a negative regulator of signal transduction in haematopoietic cells. SHIP inactivation may be involved in the pathogenesis of leukaemia. An inducible expression system was combined with microarray analysis to identify target genes regulated by SHIP in the human T-cell leukaemia cell line Jurkat. One gene identified was Krüppel-like factor 2 (KLF2), which was up-regulated two to threefold at the RNA and protein level after the induced expression of SHIP. KLF2, a negative regulator of T cell proliferation, has been implicated in T cell quiescence. KLF2 or SHIP expression in Jurkat cells caused 45% or 60% reduction of proliferation, respectively. SHIP can up-regulate KLF2 expression, implicating KLF2 in the SHIP-mediated growth inhibition of a human leukaemic T-cell line.
authors.affiliation: Centre of Experimental Medicine, Institute of Biochemistry and Molecular Biology I, Cellular Signal Transduction, University Hospital Hamburg-Eppendorf, Hamburg, Germany.
authors.forename: Lizet
authors.initials: L
authors.lastname: García-Palma
authors.forename: Stefan
authors.initials: S
authors.lastname: Horn
authors.forename: Friedrich
authors.initials: F
authors.lastname: Haag
authors.forename: Philip
authors.initials: P
authors.lastname: Diessenbacher
authors.forename: Thomas
authors.initials: T
authors.lastname: Streichert
authors.forename: Georg W
authors.initials: GW
authors.lastname: Mayr
authors.forename: Manfred
authors.initials: M
authors.lastname: Jücker
mesh_terms: D049109:Cell Proliferation; D004789:Enzyme Activation; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D000072181:Inositol Polyphosphate 5-Phosphatases; D019169:Jurkat Cells; D051741:Kruppel-Like Transcription Factors / Q000235:genetics*; D015458:Leukemia, T-Cell / Q000235:genetics* / Q000473:pathology; D020411:Oligonucleotide Array Sequence Analysis; D000072183:Phosphatidylinositol-3,4,5-Trisphosphate 5-Phosphatases; D010744:Phosphoric Monoester Hydrolases / Q000235:genetics*; D015398:Signal Transduction / Q000235:genetics; D013601:T-Lymphocytes / Q000378:metabolism* / Q000473:pathology; D015854:Up-Regulation
chemical_list: C096161:KLF2 protein, human; D051741:Kruppel-Like Transcription Factors; D010744:Phosphoric Monoester Hydrolases; D000072181:Inositol Polyphosphate 5-Phosphatases; C000606430:INPP5D protein, human; D000072183:Phosphatidylinositol-3,4,5-Trisphosphate 5-Phosphatases