Genome-Wide Identification of Prednisolone-Responsive Genes in Primary Acute Lymphoblastic Leukemia Cells.

Blood ◽  
2005 ◽  
Vol 106 (11) ◽  
pp. 103-103
Author(s):  
Wim J.E. Tissing ◽  
Monique L. den Boer ◽  
Jules P.P. Meijerink ◽  
Renee X. Menezes ◽  
Sigrid Swagemakers ◽  
...  
Keyword(s):  
Lymphoblastic Leukemia ◽  
Leukemic Cells ◽  
Interacting Protein ◽  
Childhood All ◽  
Thioredoxin Interacting Protein ◽  
Btb Domain ◽  
Genome Wide ◽  
Induced Apoptosis ◽  
Upregulated Genes

Abstract Glucocorticoids (GC) are keystone drugs in the treatment of childhood ALL and therefore it is important to get more insight in signal transduction pathways involved in GC induced apoptosis. Affymetrix U133A GeneChips were used to identify genes that are transcriptionally regulated upon 3 and 8 hours of prednisolone exposure in leukemic cells of 13 children newly diagnosed with ALL. After 3 hours of exposure no changes in gene expression could yet be found. After 8 hours exposure, 57 probesets (51 unique genes) were differentially expressed (p<0.0005 and false discovery rate <0.1) of which 44 probesets (39 genes) were upregulated (median 2.4-fold), whereas 13 probesets (12 genes) were downregulated (median 1.7-fold). Twenty-one genes were not previously found to be transcriptionally regulated by GC. Two tumor suppressor genes, Thioredoxin interacting protein (TXNIP) and Zinc finger and BTB domain containing 16 (ZBTB16), were 3.7-fold and 8.8-fold upregulated. Genes were functionally categorized in three major routes: i.e. MAPK pathways (9 genes), NF-k B signaling (11 genes) and carbohydrate metabolism (6 genes). Biological characterization of these genes and pathways might elucidate the action of GC in leukemic cells. This knowledge may point to causes of GC resistance, ways to circumvent GC resistance and new potential targets for therapy.

Genomewide identification of prednisolone-responsive genes in acute lymphoblastic leukemia cells

Blood ◽  
2007 ◽  
Vol 109 (9) ◽  
pp. 3929-3935 ◽  
Author(s):  
Wim J. E. Tissing ◽  
Monique L. den Boer ◽  
Jules P. P. Meijerink ◽  
Renee X. Menezes ◽  
Sigrid Swagemakers ◽  
...  
Keyword(s):  
Acute Lymphoblastic Leukemia ◽  
Lymphoblastic Leukemia ◽  
Differentially Expressed ◽  
Leukemic Cells ◽  
Interacting Protein ◽  
Thioredoxin Interacting Protein ◽  
Btb Domain ◽  
False Discovery ◽  
Induced Apoptosis

Abstract Glucocorticoids are keystone drugs in the treatment of childhood acute lymphoblastic leukemia (ALL). To get more insight in signal transduction pathways involved in glucocorticoid-induced apoptosis, Affymetrix U133A GeneChips were used to identify transcriptionally regulated genes on 3 and 8 hours of prednisolone exposure in leukemic cells of 13 children as compared with nonexposed cells. Following 3 hours of exposure no significant changes in gene expression could be identified. Following 8 hours of exposure, 51 genes were differentially expressed (P < .001 and false discovery rate < 10%) with 39 genes being up-regulated (median, 2.4-fold) and 12 genes were down-regulated (median, 1.7-fold). Twenty-one of those genes have not been identified before to be transcriptionally regulated by prednisolone. Two of the 3 most highly up-regulated genes were tumor suppressor genes, that is, thioredoxin-interacting protein (TXNIP; 3.7-fold) and zinc finger and BTB domain containing 16 (ZBTB16; 8.8-fold). About 50% of the differentially expressed genes were functionally categorized in 3 major routes, namely MAPK pathways (9 genes), NF-κB signaling (11 genes), and carbohydrate metabolism (5 genes). Biologic characterization of these genes and pathways might elucidate the action of glucocorticoids in ALL cells, possibly suggesting causes of glucocorticoid resistance and new potential targets for therapy.

scholarly journals Genetic Susceptibility Loci for Childhood Acute Lymphoblastic Leukemia Among Japanese

Blood ◽  
2015 ◽  
Vol 126 (23) ◽  
pp. 3731-3731
Author(s):  
Kevin Y Urayama ◽  
Masatoshi Takagi ◽  
Takahisa Kawaguchi ◽  
Keitaro Matsuo ◽  
Yoichi Tanaka ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Acute Lymphoblastic Leukemia ◽  
Lymphoblastic Leukemia ◽  
Study Group ◽  
Susceptibility Loci ◽  
East Asians ◽  
Childhood All ◽  
Genome Wide

Abstract Scrutiny of the human genome through evaluation of common genetic variants has revealed hundreds of disease susceptibility loci. In childhood acute lymphoblastic leukemia (ALL), six regions that have replicated in several populations are now considered known susceptibility loci (ARID5B, IKZF1, CEBPE, CDKN2A, PIP4K2A, and GATA3), but their effects have yet to be fully confirmed in populations of non-European ancestry. Targeted validation attempts based on the same SNPs originally identified in European ancestral populations have been performed in East Asians, but findings have been inconsistent. This may be due to differences in linkage disequilibrium patterns, allele frequency, and/or magnitude of effect between Europeans and East Asians; thus a comprehensive characterization of genetic variation across the targeted genetic loci is required for an appropriate validation attempt in different populations. Using a large network of hospitals within the Tokyo Children's Cancer Study Group, saliva samples from previously diagnosed childhood ALL patients (aged 0-19 years) were collected between December 2012 and May 2015. Genome-wide single nucleotide polymorphism (SNP) genotyping was performed and resulted in the inclusion of a total of 570 ALL patients, with genetic data available for up to about 500,000 SNPs after quality control exclusions. Control genome-wide data were available for 2,712 previously genotyped samples from the Nagahama Study Group and Aichi Cancer Center Study, Japan. SNP imputation was performed on the combined case-control dataset using ShapeIT and Minimac3, and the 1000 Genomes Project Phase I Version 3 as the reference population. Tests of association between childhood ALL and all available SNP genotypes across the six genes (mentioned above) implicated in previous genome-wide association studies was performed using logistic regression and assuming a log-additive model of inheritance. Of the six genomic regions examined, SNPs within the IKZF1, ARID5B, and PIP4K2A genes showed a statistically significant association with childhood ALL risk after Bonferroni correction. SNPs with the strongest evidence of association for these three genes included rs7090445 (ARID5B, OR=1.75, P =3.7x10-17), rs12533431 (IKZF1, OR=1.43, P =4.3x10-5), and rs11013045 (PIP4K2A, OR=0.76, P =9.5x10-5). Further examination of these regions indicated a second independently associated locus within ARID5B. Furthermore, we observed that the same previously reported primary ALL susceptibility SNPs for IKZF1 (e.g. rs4132601, rs11978267) and PIP4K2A (e.g. rs10828317, rs7088318) were not associated in Japanese. This highlights the importance of considering regional genetic variation comprehensively when testing the role of previously implicated candidate regions in a different racial/ethnic population. Characterization of the role of CEBPE, CDKN2A, and GATA3 genetic variation in Japanese may benefit from greater statistical power and potentially additional coverage of SNPs within these regions. Disclosures No relevant conflicts of interest to declare.

scholarly journals Evidence for clonal development of childhood acute lymphoblastic leukemia

Blood ◽  
1985 ◽  
Vol 66 (4) ◽  
pp. 902-907
Author(s):  
LW Dow ◽  
P Martin ◽  
J Moohr ◽  
M Greenberg ◽  
LG Macdougall ◽  
...  
Keyword(s):  
Acute Lymphoblastic Leukemia ◽  
Progenitor Cells ◽  
Lymphoblastic Leukemia ◽  
Leukemic Cells ◽  
Childhood All ◽  
Hla Dr ◽  
Blast Cells ◽  
Leukemic Clone ◽  
Clonal Development ◽  
Glucose 6 Phosphate Dehydrogenase

To determine whether acute lymphoblastic leukemia (ALL) is a clonal disease and to define the pattern of differentiation shown by the involved progenitor cells, we studied the glucose-6-phosphate dehydrogenase (G6PD) types in the cells of 19 girls heterozygous for this X chromosome-linked enzyme. Lymphoblast immunophenotypes were those of HLA-DR+, CALLA+ ALL (six patients); HLA-DR+, CALLA- ALL (four patients); pre-B cell ALL (two patients); T cell ALL (four patients); and undefined ALL (three patients). Malignant blast cells at diagnosis from ten patients displayed a single G6PD type, indicative of clonal disease. In contrast, both A and B G6PD in ratios similar to those found in skin were observed in morphologically normal blood cells from the same patients. The leukemic cells of three patients were examined at both diagnosis and relapse; in each instance the same G6PD type was found, consistent with regrowth of the original leukemic clone at relapse. Results of studies of cells from nine additional patients tested only at relapse were similar. Our results indicate that childhood ALL is a clonally derived disease involving progenitor cells with differentiation expression detected only in the lymphoid lineage.

scholarly journals Genome-Wide Identification and Characterization of CIPK Family and Analysis Responses to Various Stresses in Apple (Malus domestica)

2018 ◽  
Vol 19 (7) ◽  
pp. 2131 ◽  
Author(s):  
Lili Niu ◽  
Biying Dong ◽  
Zhihua Song ◽  
Dong Meng ◽  
Yujie Fu
Keyword(s):  
Growth Stages ◽  
Hormone Signaling ◽  
Chromosomal Distribution ◽  
Interacting Protein ◽  
C Terminus ◽  
Genome Wide ◽  
Enhanced Expression ◽  
Interaction Domains ◽  
Identification And Characterization

In the CIPK family, the CBL-interacting protein kinases have shown crucial roles in hormone signaling transduction, and response to abiotic stress in plant developmental processes. The CIPK family is characterized by conserved NAF/FISL (Asn-Ala-Phe) and PPI (protein-phosphatase interaction) domains in the C-terminus. However, little data has been reported about the CIPK family in apple. A total of 34 MdCIPK genes were identified from the apple genome in this study and were later divided into two groups according to the CIPK domains, characterized by gene structure and chromosomal distribution, and then mapped onto 17 chromosomes. All MdCIPK genes were expressed in the four apple tissues (leaf, root, flower, and fruit). In addition, the MdCIPK gene expression profile showed that five members among them revealed enhanced expression during the pollen tube growth stages. The MdCIPK4 was the most expressive during the entire fruit development stages. Under stress conditions 21 MdCIPK genes transcript levels were up-regulated in response to fungal and salt treatments. This suggested the possible features of these genes’ response to stresses in apples. Our findings provide a new insight about the roles of CIPK genes in apples, which could contribute to the cloning and functional analysis of CIPK genes in the future.

scholarly journals Genes identified through genome-wide association studies of osteonecrosis in childhood acute lymphoblastic leukemia patients

2019 ◽  
Vol 20 (17) ◽  
pp. 1189-1197 ◽  
Author(s):  
Vincent Gagné ◽  
Anne Aubry-Morin ◽  
Maria Plesa ◽  
Rachid Abaji ◽  
Kateryna Petrykey ◽  
...  
Keyword(s):  
Association Studies ◽  
Lymphoblastic Leukemia ◽  
Genome Wide Association ◽  
Genome Wide Association Studies ◽  
Sequencing Data ◽  
Childhood All ◽  
Exome Sequencing Data ◽  
Genome Wide ◽  
Whole Exome ◽  
Whole Exome Sequencing Data

Aim: To evaluate top-ranking genes identified through genome-wide association studies for an association with corticosteroid-related osteonecrosis in children with acute lymphoblastic leukemia (ALL) who received Dana–Farber Cancer Institute treatment protocols. Patients & methods: Lead SNPs from these studies, as well as other variants in the same genes, pooled from whole exome sequencing data, were analyzed for an association with osteonecrosis in childhood ALL patients from Quebec cohort. Top-ranking variants were verified in the replication patient group. Results: The analyses of variants in the ACP1-SH3YL1 locus derived from whole exome sequencing data showed an association of several correlated SNPs (rs11553746, rs2290911, rs7595075, rs2306060 and rs79716074). The rs79716074 defines *B haplotype of the APC1 gene, which is well known for its functional role. Conclusion: This study confirms implication of the ACP1 gene in the treatment-related osteonecrosis in childhood ALL and identifies novel, potentially causal variant of this complication.

scholarly journals Characterization of acute undifferentiated leukemia by combined analysis of plasma membrane-associated gamma-glutamyltranspeptidase and soluble terminal transferase

Blood ◽  
1985 ◽  
Vol 66 (2) ◽  
pp. 255-258 ◽  
Author(s):  
D Heumann ◽  
G Losa ◽  
C Barras ◽  
A Morell ◽  
V von Fliedner
Keyword(s):  
Plasma Membrane ◽  
Acute Lymphoblastic Leukemia ◽  
Enzyme Activities ◽  
Colorimetric Assay ◽  
Lymphoblastic Leukemia ◽  
Leukemic Cells ◽  
Acute Leukemias ◽  
Combined Analysis ◽  
Enzyme Markers

Abstract gamma-Glutamyltranspeptidase (gamma-GT) is a plasma membrane-associated enzyme present in blasts of certain acute leukemias. We analyzed 90 cases of undifferentiated and differentiated acute leukemias for gamma- GT, using a colorimetric assay. Blasts of all patients with common acute lymphoblastic leukemia (ALL) and T-ALL were negative for gamma-GT (less than 5 units). In contrast, gamma-GT was significantly elevated in acute myeloblastic or monoblastic leukemia blasts (P less than .001). In 16 cases of acute undifferentiated leukemia (AUL) studied, the levels of gamma-GT ranged from 0 to 93 units; in eight cases, gamma- GT was positive (greater than 5 units), and six of these had 2% to 5% Sudan black-positive leukemic cells in the blast-enriched suspension. Combined gamma-GT/TdT analysis revealed that both enzyme markers were mutually exclusive in 75% of AUL cases, suggesting that gamma-GT+/TdT- blasts are of nonlymphoid origin, and gamma-GT-/TdT+ blasts are of lymphoid origin. Two cases were devoid of both enzyme activities and could represent truly undifferentiated leukemia. Thus, combined gamma- GT/TdT analysis underlines the heterogeneity of AUL and appears to be useful in defining the lineage commitment of undifferentiated leukemic blasts.

scholarly journals High incidence of potential p53 inactivation in poor outcome childhood acute lymphoblastic leukemia at diagnosis

Blood ◽  
1996 ◽  
Vol 87 (3) ◽  
pp. 1155-1161 ◽  
Author(s):  
DI Marks ◽  
BW Kurz ◽  
MP Link ◽  
E Ng ◽  
JJ Shuster ◽  
...  
Keyword(s):  
Acute Lymphoblastic Leukemia ◽  
Complete Remission ◽  
Mononuclear Cells ◽  
Lymphoblastic Leukemia ◽  
Gene Mutations ◽  
P53 Gene ◽  
Leukemic Cells ◽  
Childhood All ◽  
P53 Gene Mutations ◽  
P53 Inactivation

Previous studies have indicated that p53 gene mutations were an uncommon event in acute lymphoblastic leukemia (ALL) in children. In one series of 330 patients, p53 mutations were seen in fewer than 3%. We analyzed bone marrow mononuclear cells derived from 10 children with ALL at diagnosis who subsequently failed to achieve a complete remission or who developed relapse within 6 months of attaining complete remission for p53 gene mutations and mdm-2 overexpression. We found that three children had p53 gene mutations, and four overexpressed mdm-2. Also, experiments comparing relative levels of mdm- 2 RNA and protein in these patients demonstrated that mdm-2 overexpression can occur at the transcriptional and posttranscriptional level in primary leukemic cells. Although we were unable to link Waf-1 RNA expression with p53 status in childhood ALL, our data show potential p53 inactivation by multiple mechanisms in a large percentage of these patients and demonstrate that these alterations can be detected at diagnosis. Inactivation of the p53 pathway may, therefore, be important in children with ALL who fail to respond to treatment and may be useful for the early identification of children requiring alternative therapies.

scholarly journals Characterization of non-human primate antisera to acute lymphoblastic leukemia (ALL): evidence for unique antigen(s) on childhood ALL of "T" phenotype

Blood ◽  
1983 ◽  
Vol 61 (1) ◽  
pp. 66-70
Author(s):  
T Mohanakumar ◽  
TW Coffey ◽  
MP Vaughn ◽  
EC Russell ◽  
D Conrad
Keyword(s):  
Acute Lymphoblastic Leukemia ◽  
Lymphoblastic Leukemia ◽  
Cell Phenotype ◽  
Membrane Component ◽  
Childhood All ◽  
Antigen Present ◽  
The Common ◽  
Blood Elements ◽  
Human Primate

Abstract A non-human primate antiserum was prepared to acute lymphoblastic leukemia of T-cell phenotype (T-ALL) and, after absorptions with normal blood elements, reacted by immunofluorescence and microcytotoxicity to all the T-ALL tested. In addition, the antiserum reacted with cells from about 70% of the common ALL studied and immunoprecipitated the common ALL antigen of 100,000 daltons. However, when the anti-T-ALL serum was absorbed with with lymphoblasts from common ALL, it failed to react with common ALL lymphoblasts, yet reacted significantly with cells from patients with T-ALL phenotype and defined a 100,000-dalton membrane component not found on common ALL lymphoblasts. In addition, sequential immunoprecipitation of 125I-labeled T-ALL membranes by anti- common-ALL serum followed by anti-T-ALL serum detected the T-ALL membrane component of 100,000 daltons that was not found on common ALL. Thus, our results demonstrate the presence of of a unique human T-ALL antigen present on all T-ALL distinct from the common ALL antigen.

Role of Erythropoietin Receptor in t(12;21) Positive Acute Lymphoblastic Leukemia.

Blood ◽  
2007 ◽  
Vol 110 (11) ◽  
pp. 2792-2792
Author(s):  
Renate Panzer-Gruemayer ◽  
Gerd Krapf ◽  
Dominik Beck ◽  
Gerhard Fuka ◽  
Christian Bieglmayer ◽  
...  
Keyword(s):  
Cell Lines ◽  
Fusion Gene ◽  
Lymphoblastic Leukemia ◽  
Leukemic Cell ◽  
Erythropoietin Receptor ◽  
Molecular Signature ◽  
Leukemic Cells ◽  
Drug Induced ◽  
Induced Apoptosis

Abstract The chromosomal translocation t(12;21)(p13;q22) resulting in the TEL/AML1 (also known as ETV6/ RUNX1) fusion gene is the most frequent translocation in childhood B cell precursor (BCP) ALL. This type of ALL is characterized by a unique molecular signature, which includes the overexpression of the gene for the erythropoietin receptor (EpoR). So far, it is not known what causes the overexpression of the EpoR gene or whether it has any effect on the t(12;21) positive leukemia. We therefore aimed to evaluate potential mechanisms responsible for the upregulation of the EpoR in t(12;21) leukemias and to find out whether signalling via this receptor affects survival or proliferation of leukemic cells. In addition, we planned to explore signalling pathways linked to the respective effects and to elucidate relevant mechanisms that might be essential for cell survival. We first excluded the possibility that the EpoR expression is upregulated as a consequence of high Epo levels in the plasma that are induced by the patients’ low hemoglobin (Hb) levels. While Hb levels from patients with t(12;21)+ ALL were significantly lower compared to those with other subtypes of BCP ALL (median, 6,15g/dL and 7,9g/dL, respectively; p<0.001 Wilcoxon 2- sample test), which correlated with high Epo levels in the plasma, the extent of EpoR mRNA expression of leukemic cells was independent of the respective amount of Epo in the individual patient’s plasma. Next, the influence of Epo on t(12;21) + leukemic cell lines was evaluated and revealed a consistent time and dose dependent increase in proliferation (Epo concentrations 10, 50, 100U/ml for 72 hours) determined by 3H-Thymidine incorporation. This effect was abrogated upon addition of a blocking anti-EpoR antibody thereby confirming the specificity of EpoR signalling. Since Epo may have apoptosis-modulating potential in EpoR expressing malignant cells, we tested its influence on drug-induced apoptosis. For this purpose IC50 concentrations of drugs that are commonly used for the treatment of children with BCP ALL were used. A reduction of glucocorticoid (GC)-induced apoptosis by Epo was demonstrated in t(12;21)+ cell lines while no effect was seen in combination with other drugs or in t(12;21) negative cell lines. Preliminary data indicate that NF-kappa B as well as PI3K/Akt pathways are triggered by Epo, implying that they play a role in this rescue mechanism. Given that cell lines may have intrinsic changes, we are presently evaluating whether the observed results can also be reproduced in primary leukemic cells. In support of this assumption are results in a limited number of primary t(12;21)+ leukemias showing a superior survival (MTT assay) and reduced apoptosis rate to GC when cultured in the presence of Epo. These findings are in contrast to those in t(12;21) negative BCP ALLs. In conclusion, our data indicate that overexpression of EpoR in t(12;21) positive leukemias is not induced by low Hb, a feature that is generally observed in patients with this type of leukemia. Binding of Epo to its receptor in vitro leads to enhanced survival and negatively affects the sensitivity to GCs. Whether these findings have any implications on the treatment and care of patients with t(12;21)+ leukemia needs to be addressed in further studies. Financial support: OENB10720, FWF P17551-B14 and GENAU-CHILD Projekt GZ200.136/1 - VI/1/2005 to RPG.

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