Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of human blood lymphoblasts purified at three time points from childhood ALL samples (0h, 6-8h, 24h after treatment with prednisolone

ABSTRACT: Glucocorticoids (GC) are in most chemotherapy protocols for lymphoid malignancies, particularly childhood acute lymphoblastic leukaemia (ALL) for their ability to induce apoptosis in malignant blast. The underlying mechanism, however, has so far only been investigated in model systems. This study comprises Affymetrix hgu133 plus 2.0 analyses of; Peripheral blood lymphoblasts purified at three time points (0h, 6-8h, 24h after treatment initiation) from 13 children under therapy for ALL . Treated samples were compared to untreated (0h). For comparison, expression profiles were generated from an adult ALL patient, peripheral blood lymphocytes from GC-exposed healthy donors, GC-sensitive and -resistant ALL cell lines and mouse thymocytes treated with GC in vivo and in vitro. This second series comprises the additional samples mentioned above. Findings. An essentially complete list of GC-regulated candidate genes in clinical settings experimental and was generated, enabling immediate analysis of any gene with respect to its potential significance for GC-induced apoptosis in these systems. Gene regulations previously thought responsible for cell death in experimental systems were reconfirmed in few children only. In contrast, a small number of genes, most not implicated in GC-induced apoptosis previously, were co-ordinately regulated in the majority of children. Experiment Overall Design: replicates: prednisolone treated GSM60594, GSM60595. untreated: GSM60597, GSM60599. Bone marrow samples sorted / unsorted: GSM60601, GSM60603. Experiment Overall Design: Samples are assigned to various subgroups: sensitive systems, resistant systems, Prednisolone treated, ethanol (control) treated, cyclohexamide treated, untreated, 6 hours treatment and 24 hours treated. Experiment Overall Design: Glucocorticoid treated samples of patients or cell lines or healthy donors were compared to their untreated or ethanol treated counterparts.

ORGANISM(S): Homo sapiens

SUBMITTER: Johannes Rainer

PROVIDER: E-GEOD-2842 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Identification of glucocorticoid-response genes in children with acute lymphoblastic leukemia.

Schmidt Stefan S Rainer Johannes J Riml Stefan S Ploner Christian C Jesacher Simone S Achmüller Clemens C Presul Elisabeth E Skvortsov Sergej S Crazzolara Roman R Fiegl Michael M Raivio Taneli T Jänne Olli A OA Geley Stephan S Meister Bernhard B Kofler Reinhard R

Blood 20051117 5

The ability of glucocorticoids (GCs) to kill lymphoid cells led to their inclusion in essentially all chemotherapy protocols for lymphoid malignancies, particularly childhood acute lymphoblastic leukemia (ALL). GCs mediate apoptosis via their cognate receptor and subsequent alterations in gene expression. Previous investigations, including expression profiling studies with subgenome microarrays in model systems, have led to a number of attractive, but conflicting, hypotheses that have never been ...[more]

PMID: 16293608

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Project description:Gene expression data of glucocorticoid resistant and sensitive acute lymphoblastic leukemia cell lines for the article: Expression, regulation and function of phosphofructo-kinase/fructose-biphosphatases (PFKFBs) in glucocorticoid-induced apoptosis of acute lymphoblastic leukemia cells Glucocorticoids (GCs) cause apoptosis and cell cycle arrest in lymphoid cells and constitute a central component in the therapy of lymphoid malignancies, most notably childhood acute lymphoblastic leukemia (ALL). PFKFB2 (6-phosphofructo-2-kinase/fructose-2,6-biphosphatase-2), a kinase controlling glucose metabolism, was identified by us previously as GC response gene in expression profiling analyses performed in children with ALL during initial systemic GC mono-therapy. Since deregulation of glucose metabolism has been implicated in apoptosis induction, this gene and its relatives PFKFB1, 3, and 4 were further analyzed. Expression analyses in additional ALL children, non-leukemic individuals and leukemic cell lines confirmed frequent PFKFB2 induction by GC in most systems sensitive to GC-induced apoptosis, particularly in T-ALL cells. The 3 other family members, in contrast, were not or weakly expressed (PFKFB1 and 4) or not induced by GC (PFKFB3). Conditional PFKFB2 over-expression in the CCRF-CEM T-ALL in vitro model revealed that its 2 splice variants (15A and 15B) did not have any detectable effect on survival or cell cycle progression. Moreover, neither PFKFB2 splice variant significantly affected sensitivity to, or kinetics of, GC-induced apoptosis. Our data suggest that, at least in the model system investigated, PFKFB2 is not an essential upstream regulator of the anti-leukemic effects of GC. Generation of the GC sensitive and resistant clones is described in Parson et al. FASEB J 2005 (Pubmed id 15637111). In brief GC sensitive clones were generated by limiting dilution subcloning from the GC sensitive T-ALL cell line CCRF-CEM-C7H2. To generate GC resistant clones the CCRF-CEM-C7H2 cell line was clutured in the presence of 10E-7 M dexametasone. Gene expression profiles of glucocorticoid (GC) resistant and sensitive T-ALL cells during GC treatment and corresponding control samples (cells treated with carrier control). GC induced regulation of PFKFB2 was determined in the various cell lines based on the expression intensities of the corresponding probe sets in GC treated and control samples.

Dataset Information

Transcription profiling of human blood lymphoblasts purified at three time points from childhood ALL samples (0h, 6-8h, 24h after treatment with prednisolone

Publications

Identification of glucocorticoid-response genes in children with acute lymphoblastic leukemia.

Similar Datasets

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