Publications (16)92.54 Total impact
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Article: AICAR induces Bax/Bak-dependent apoptosis through upregulation of the BH3-only proteins Bim and Noxa in mouse embryonic fibroblasts.
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ABSTRACT: 5-Aminoimidazole-4-carboxamide (AICA) riboside (AICAR) is a nucleoside analogue that is phosphorylated to 5-amino-4-imidazolecarboxamide ribotide (ZMP), which acts as an AMP mimetic and activates AMP-activated protein kinase (AMPK). It has been recently described that AICAR triggers apoptosis in chronic lymphocytic leukemia (CLL) cells, and its mechanism of action is independent of AMPK as well as p53. AICAR-mediated upregulation of the BH3-only proteins BIM and NOXA correlates with apoptosis induction in CLL cells. Here we propose mouse embryonic fibroblasts (MEFs) as a useful model to analyze the mechanism of AICAR-induced apoptosis. ZMP formation was required for AICAR-induced apoptosis, though direct Ampk activation with A-769662 failed to induce apoptosis in MEFs. AICAR potently induced apoptosis in Ampkα1 (-/-) /α2 (-/-) MEFs, demonstrating an Ampk-independent mechanism of cell death activation. In addition, AICAR acts independently of p53, as MEFs lacking p53 also underwent apoptosis normally. Notably, MEFs lacking Bax and Bak were completely resistant to AICAR-induced apoptosis, confirming the involvement of the mitochondrial pathway in its mechanism of action. Apoptosis was preceded by ZMP-dependent but Ampk-independent modulation of the mRNA levels of different Bcl-2 family members, including Noxa, Bim and Bcl-2. Bim protein levels were accumulated upon AICAR treatment of MEFs, suggesting its role in the apoptotic process. Strikingly, MEFs lacking both Bim and Noxa displayed high resistance to AICAR. These findings support the notion that MEFs are a useful system to further dissect the mechanism of AICAR-induced apoptosis.Apoptosis 04/2013; · 4.07 Impact Factor -
Article: Epigenetic profile in chronic lymphocytic leukemia using methylation-specific multiplex ligation-dependent probe amplification.
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ABSTRACT: Aim: To analyze the methylation status of 35 tumor suppressor genes using methylation-specific multiplex ligation-dependent probe amplification (MS-MLPA) in chronic lymphocytic leukemia (CLL). Materials & methods: The DNA of 37 samples from patients with CLL, six healthy donors, and Jurkat and Ramos cell lines was analyzed by MS-MLPA. Results: Our results confirm that hypermethylation is a common and not randomly distributed event in CLL, and some genes, such as WT1, CDH13, IGSF4/TSLC1, GATA5, DAPK1 and RARB, are hypermethylated in more than 25% of the analyzed samples. Importantly, MS-MLPA also detected hypermethylation of some genes not reported previously in CLL, and their methylation status was confirmed by bisulfite sequencing. Conclusion: These results indicate that MS-MLPA is a useful technique for the detection of methylation in CLL samples. Selecting CLL-specific methylation targets in order to generate a CLL-specific MS-MLPA probe set could enhance its usefulness as a tool in studies of risk stratification and guiding the best therapeutic decision.Epigenomics 10/2012; 4(5):491-501. -
Article: Glycogen synthase kinase-3β is involved in ligand-dependent activation of transcription and cellular localization of the glucocorticoid receptor.
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ABSTRACT: Glucocorticoids (GC) induce cell cycle arrest and apoptosis in different cell types and therefore are widely used to treat a variety of diseases including autoimmune disorders and cancer. This effect is mediated by the GC receptor (GR), a ligand-activated transcription factor that translocates into the nucleus where it modulates transcription of target genes in a promoter-specific manner. Glycogen synthase kinase-3 (GSK3) regulates GR response by genomic and nongenomic mechanisms, although the specific role of each isoform is not well defined. We used GSK3 pharmacological inhibitors and isoform-specific small interfering RNA to evaluate the role of GSK3 in the genomic regulation induced by GC. GSK3 inhibition resulted in the reduction of GC-induced mRNA expression of GC-induced genes such as BIM, HIAP1, and GILZ. Knockdown of GSK3β but not GSK3α reduced endogenous GILZ induction in response to dexamethasone and GR-dependent reporter gene activity. Chromatin immunoprecipitation experiments revealed that GSK3 inhibition impaired the dexamethasone-mediated binding of GR and RNA polymerase II to endogenous GILZ promoter. These results indicate that GSK3β is important for GR transactivation activity and that GSK3β inhibition suppresses GC-stimulated gene expression. Furthermore, we show that genomic regulation by the GR is independent of known GSK3β phosphorylation sites. We propose that GC-dependent transcriptional activation requires functional GSK3β signaling and that altered GSK3β activity influences cell response to GC.Molecular Endocrinology 07/2012; 26(9):1508-20. · 4.54 Impact Factor -
Article: Analysis of apoptosis regulatory genes altered by histone deacetylase inhibitors in chronic lymphocytic leukemia cells.
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ABSTRACT: Histone deacetylases (HDACs) play a key role in the regulation of acetylation status not only of histones but also of many other non-histone proteins involved in cell cycle regulation, differentiation or apoptosis. Therefore, histone deacetylase inhibitors (HDACi) have emerged as promising anticancer agents. Herein, we report the characterization of apoptosis in B-cell chronic lymphocytic leukemia (CLL) induced by two HDACi, Kendine 92 and SAHA. Both inhibitors induce dose-, time- and caspase-dependent apoptosis through the mitochondrial pathway. Interestingly, Kendine 92 and SAHA show a selective cytotoxicity for B lymphocytes and induce apoptosis in CLL cells with mutated or deleted TP53 as effectively as in tumor cells harboring wild-type TP53. The pattern of apoptosis-related gene and protein expression profile has been characterized. It has shown to be irrespective of TP53 status and highly similar between SAHA and Kendine 92 exposure. The balance between the increased BAD, BNIP3L, BNIP3, BIM, PUMA and AIF mRNA expression levels, and decreased expression of BCL-W, BCL-2, BFL-1, XIAP and FLIP indicates global changes in the apoptosis mRNA expression profile consistent with the apoptotic outcome. Protein expression analysis shows increased levels of NOXA, BIM and PUMA proteins upon Kendine 92 and SAHA treatment. Our results highlight the capability of these molecules to induce apoptosis not only in a selective manner but also in those cells frequently resistant to standard treatments. Thus, Kendine 92 is a novel HDACi with anticancer efficacy for non-proliferating CLL cells.Epigenetics: official journal of the DNA Methylation Society 10/2011; 6(10):1228-35. · 4.58 Impact Factor -
Article: AICAR induces apoptosis independently of AMPK and p53 through up-regulation of the BH3-only proteins BIM and NOXA in chronic lymphocytic leukemia cells.
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ABSTRACT: 5-Aminoimidazole-4-carboxamide riboside or acadesine (AICAR) induces apoptosis in chronic lymphocytic leukemia (CLL) cells. A clinical study of AICAR is currently being performed in patients with this disease. Here, we have analyzed the mechanisms involved in AICAR-induced apoptosis in CLL cells in which it activates its only well-known molecular target, adenosine monophosphate-activated protein kinase (AMPK). However, AMPK activation with phenformin or A-769662 failed to induce apoptosis in CLL cells and AICAR also potently induced apoptosis in B lymphocytes from Ampkα1(-/-) mice, demonstrating an AMPK-independent mechanism of cell death. Importantly, AICAR induced apoptosis irrespective of the tumor suppressor TP53 or ataxia telangiectasia mutated (ATM) status via induction of the mitochondrial pathway. Apoptosis was preceded by an increase in mRNA and protein levels of proapoptotic BCL-2 family proteins of the BH3-only subgroup, including BIM, NOXA, and PUMA in CLL cells. Strikingly, B lymphocytes from Noxa(-/-) or Bim(-/-) mice were partially protected from the cytotoxic effects of AICAR. Consistently, B cells from Noxa(-/-)/Bim(-/-) mice resisted induction of apoptosis by AICAR as potently as B lymphocytes overexpressing transgenic BCL-2. These findings support the notion that AICAR is an interesting alternative therapeutic option for CLL patients with impaired p53 function and resistance to conventional chemotherapy.Blood 10/2010; 116(16):3023-32. · 9.90 Impact Factor -
Article: Isoform-selective phosphoinositide 3-kinase inhibitors induce apoptosis in chronic lymphocytic leukaemia cells.
British Journal of Haematology 03/2010; 150(1):108-11. · 4.94 Impact Factor -
Article: Aspirin induces apoptosis in human leukemia cells independently of NF-kappaB and MAPKs through alteration of the Mcl-1/Noxa balance.
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ABSTRACT: Aspirin and other non-steroidal anti-inflammatory drugs induce apoptosis in most cell types. In this study we examined the mechanism of aspirin-induced apoptosis in human leukemia cells. We analyzed the role of nuclear factor-kappaB (NF-kappaB) and mitogen-activated protein kinases (MAPKs) pathways. Furthermore, we studied the changes induced by aspirin in some genes involved in the control of apoptosis at mRNA level, by performing reverse transcriptase multiplex ligation-dependent probe amplification (RT-MLPA), and at protein level by Western blot. Our results show that aspirin induced apoptosis in leukemia Jurkat T cells independently of NF-kappaB. Although aspirin induced p38 MAPK and c-Jun N-terminal kinase activation, selective inhibitors of these kinases did not inhibit aspirin-induced apoptosis. We studied the regulation of Bcl-2 family members in aspirin-induced apoptosis. Aspirin increased the mRNA levels of some pro-apoptotic members, such as BIM, NOXA, BMF or PUMA, but their protein levels did not change. In contrast, aspirin decreased the protein levels of Mcl-1. Interestingly, in the presence of aspirin the protein levels of Noxa remained high. This alteration of the Mcl-1/Noxa balance was also found in other leukemia cell lines and primary chronic lymphocytic leukemia cells (CLL). Furthermore, in CLL cells aspirin induced an increase in the protein levels of Noxa. Knockdown of Noxa or Puma significantly attenuated aspirin-induced apoptosis. These results indicate that aspirin induces apoptosis through alteration of the Mcl-1/ Noxa balance.Apoptosis 11/2009; 15(2):219-29. · 4.07 Impact Factor -
Article: Akt inhibitors induce apoptosis in chronic lymphocytic leukemia cells.
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ABSTRACT: The phosphatidylinositol-3-kinase/Akt pathway has been described to be critical in the survival of chronic lymphocytic leukemia cells. In this study we analyzed the effect of two selective chemical inhibitors of Akt (Akti-1/2 and A-443654) on the survival of chronic lymphocytic leukemia cells. Using cytometry we studied the cytotoxic effects of Akt inhibitors on peripheral B and T lymphocytes from patients with chronic lymphocytic leukemia and from healthy donors. We studied the changes induced by Akti-1/2 and A-443654 at the mRNA level by performing reverse transcriptase multiplex ligation-dependent probe amplification. We also studied the changes induced by both Akt inhibitors in some BCL-2 protein family members on chronic lymphocytic leukemia cells by western blotting. Moreover, we analyzed the cytotoxic effect of Akt inhibitors in patients' cells with deleted/mutated TP53. Both inhibitors induced apoptosis in chronic lymphocytic leukemia cells in a dose-dependent manner. Moreover, B cells from patients with chronic lymphocytic leukemia were more sensitive to Akt inhibitors than T cells from leukemic patients, and B or T cells from healthy donors. Survival factors for chronic lymphocytic leukemia cells, such as interleukin-4 and stromal cell-derived factor-1alpha, were not able to block the apoptosis induced by either Akt inhibitor. Akti-1/2 did not induce any change in the mRNA expression profile of genes involved in apoptosis, while A-443654 induced some changes, including an increase in NOXA and PUMA mRNA levels, suggesting the existence of additional targets for A-443654. Both inhibitors induced an increase in PUMA and NOXA protein levels, and a decrease in MCL-1 protein level. Moreover, Akti-1/2 and A-443654 induced apoptosis irrespective of TP53 status. These results demonstrate that Akt inhibitors induce apoptosis of chronic lymphocytic leukemia cells and might be a new therapeutic option for the treatment of chronic lymphocytic leukemia.Haematologica 10/2009; 94(12):1698-707. · 6.42 Impact Factor -
Article: Overactivation of the MEK/ERK pathway in liver tumor cells confers resistance to TGF-{beta}-induced cell death through impairing up-regulation of the NADPH oxidase NOX4.
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ABSTRACT: Transforming growth factor-beta (TGF-beta) induces apoptosis in hepatocytes, being considered a liver tumor suppressor. However, many human hepatocellular carcinoma (HCC) cells escape from its proapoptotic effects, gaining response to this cytokine in terms of malignancy. We have recently reported that the apoptosis induced by TGF-beta in hepatocytes requires up-regulation of the NADPH oxidase NOX4, which mediates reactive oxygen species (ROS) production. TGF-beta-induced NOX4 expression is inhibited by antiapoptotic signals, such as the phosphatydilinositol-3-phosphate kinase or the mitogen-activated protein kinase (MAPK)/extracellular signal-regulated kinase (ERK) pathways. The aim of the present work was to analyze whether resistance to TGF-beta-induced apoptosis in HCC cells is related to the impairment of NOX4 up-regulation due to overactivation of survival signals. Results indicate that inhibition of the MAPK/ERK kinase (MEK)/ERK pathway in HepG2 cells, which are refractory to the proapoptotic effects of TGF-beta, sensitizes them to cell death through a mitochondrial-dependent mechanism, coincident with increased levels of BIM and BMF, decreased levels of BCL-XL and MCL1, and BAX/BAK activation. Regulation of BMF, BCL-XL, and MCL1 occurs at the mRNA level, whereas BIM regulation occurs post-transcriptionally. ROS production and glutathione depletion are only observed in cells treated with TGF-beta and PD98059, which correlates with NOX4 up-regulation. Targeting knockdown of NOX4 impairs ROS increase and all the mitochondrial-dependent apoptotic features by a mechanism that is upstream from the regulation of BIM, BMF, BCL-XL, and MCL1 levels. In conclusion, overactivation of the MEK/ERK pathway in liver tumor cells confers resistance to TGF-beta-induced cell death through impairing NOX4 up-regulation, which is required for an efficient mitochondrial-dependent apoptosis.Cancer Research 09/2009; 69(19):7595-602. · 7.86 Impact Factor -
Article: Multiplex ligation-dependent probe amplification for detection of genomic alterations in chronic lymphocytic leukaemia.
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ABSTRACT: Chronic lymphocytic leukaemia (CLL) is the commonest form of leukaemia in adults in Western countries. We performed multiplex ligation-dependent probe amplification (MLPA) analysis in 50 CLL patients to identify multiple genomic CLL-specific targets, including genes located at 13q14, 17p13 (TP53), 11q23 (ATM) and chromosome 12, and compared the results with those obtained with fluorescence in situ hybridization (FISH). There was a good correlation between MLPA and FISH results, as most alterations (89%) were detected by both techniques. Only three cases with a low percentage (<25%) of cells carrying the alterations were not detected by MLPA. On the other hand, as MLPA uses multiple probes it identified intragenic or small alterations undetected by FISH in three cases. MLPA also detected alterations in 8q24 (MYC) and 6q25-26. In summary, unlike interphase FISH, MLPA enabled the simultaneous analysis of many samples with automated data processing at a low cost. Therefore, the combination of robust multiplexing and high throughput makes MLPA a useful technique for the analysis of genomic alterations in CLL.British Journal of Haematology 06/2008; 142(5):793-801. · 4.94 Impact Factor -
Article: The potential anticancer agent PK11195 induces apoptosis irrespective of p53 and ATM status in chronic lymphocytic leukemia cells.
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ABSTRACT: The potential anticancer agent 1-(2-chlorophenyl-N-methylpropyl)-3-isoquinolinecarboxamide (PK11195), a translocator protein (18KDa) (TSPO) ligand, facilitates the induction of cell death by a variety of cytotoxic and chemotherapeutic agents. Primary chronic lymphocytic leukemia (CLL) cells overexpress TSPO. The aim of this study was to examine the effects of PK11195 on CLL cells. Table 1. Characteristics of the patients with chronic lymphocytic leukemia. Using cytometric analysis, we studied the cytotoxic effects of PK11195 on peripheral B and T lymphocytes from patients with CLL and from healthy donors. Western blot and cytometric analyses were used to study the mitochondrial effects of PK11195 on CLL cells. Moreover, we analyzed the cytotoxic effect of PK11195 in patients' cells with mutated p53 or ATM. PK11195 induces apoptosis and had additive effects with chemotherapeutic drugs in primary CLL cells. Other TSPO ligands such as RO 5-4864 and FGIN-1-27 also induce apoptosis in CLL cells. PK11195 induces mitochondrial depolarization and cytochrome c release upstream of caspase activation, and dithiocyana-tostilbene-2,2- disulfonic acid (DIDS), a voltage-dependent anion channel (VDAC) inhibitor, inhibits PK11195-induced apoptosis, demonstrating a direct involvement of mitochondria. CLL cells and normal B cells are more sensitive than T cells to PK11195-induced apoptosis. Interestingly, PK11195 induced apoptosis in CLL cells irrespective of their p53 or ATM status. These results suggest that PK11195 alone or in combination with chemotherapeutic drugs might be a new therapeutic option for the treatment of CLL.Haematologica 01/2008; 92(12):1631-8. · 6.42 Impact Factor -
Article: Bcl-2 inhibitors induce apoptosis in chronic lymphocytic leukemia cells.
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ABSTRACT: Antiapoptotic Bcl-2 is overexpressed in most cases of chronic lymphocytic leukemia (CLL). The inhibition of the antiapoptotic Bcl-2 proteins is an attractive strategy for either restoring normal apoptotic process in cancer cells or making these cells more susceptible to conventional chemotherapy. We studied the effect of Bcl-2 inhibitors on the viability of cells from CLL and other mature B-cell neoplasms. We studied the cytotoxic effects of four nonpeptidic cell-permeable Bcl-2 inhibitors (HA14-1, antimycin A, GX15-003, and GX15-070) on B cells from patients with CLL, mantle cell lymphoma (MCL), and splenic marginal zone lymphoma (SMZL). Moreover, we analyzed the effect of these inhibitors in combination with fludarabine or chlorambucil. HA14-1 induced apoptosis with an EC50 lower than 50 microM in 26 of the 36 CLL samples analyzed. The mean EC50 for these sensitive patients was 23 +/- 2 microM. Antimycin A induced apoptosis in 13 of the 18 CLL samples analyzed. Both HA14-1 and antimycin A induced cytochrome c release from mitochondria and caspase-3 activation. Moreover, HA14-1 induced apoptosis in peripheral cells from MCL and SMZL. HA14-1 also induced apoptosis in CLL samples with alterations in p53 or ATM. Finally, GX compounds induced apoptosis in B cells from 9 of the 11 CLL samples tested. The combination of either HA14-1, antimycin A, or GX compounds with fludarabine or chlorambucil had additive cytotoxic effects on CLL cells. Bcl-2 inhibitors induce apoptosis in CLL cells ex vivo and could be used in CLL as monotherapy or given in combination with current chemotherapy.Experimental Hematology 01/2007; 34(12):1663-9. · 2.90 Impact Factor -
Article: Regulation of Akt/PKB by phosphatidylinositol 3-kinase-dependent and -independent pathways in B-cell chronic lymphocytic leukemia cells: role of protein kinase C{beta}.
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ABSTRACT: Apoptosis of B cell chronic lymphocytic leukemia (B-CLL) cells is regulated by the PI-3K-Akt pathway. In the present work, we have analyzed the mechanisms of Akt phosphorylation in B-CLL cells. Freshly isolated cells present basal Akt phosphorylation, which is PI-3K-dependent, as incubation with the PI-3K inhibitor LY294002 decreased Ser-473 and Thr-308 phosphorylation in most samples analyzed (seven out of 10). In three out of 10 cases, inhibition of protein kinase C (PKC) inhibited basal Akt phosphorylation. Stromal cell-derived factor-1alpha, IL-4, and B cell receptor activation induced PI-3K-dependent Akt phosphorylation. PMA induced the phosphorylation of Akt at Ser-473 and Thr-308 and the phosphorylation of Akt substrates, independently of PI-3K in B-CLL cells. In contrast, PKC-mediated phosphorylation of Akt was PI-3K-dependent in normal B cells. Finally, a specific inhibitor of PKCbeta blocked the phosphorylation and activation of Akt by PMA in B-CLL cells. Taken together, these results suggest a model in which Akt could be activated by two different pathways (PI-3K and PKCbeta) in B-CLL cells.Journal of Leukocyte Biology 01/2007; 80(6):1473-9. · 4.99 Impact Factor -
Article: MDM2 antagonists activate p53 and synergize with genotoxic drugs in B-cell chronic lymphocytic leukemia cells.
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ABSTRACT: B-cell chronic lymphocytic leukemia (B-CLL) is characterized by the accumulation of long-lived CD5(+) B lymphocytes. Several drugs currently used in the therapy of B-CLL act, at least partially, through activation of the p53 pathway. Recently, nongenotoxic small-molecule activators of p53, the nutlins, have been developed that inhibit p53-MDM2 binding. We have investigated the antitumor potential of nutlin-3 in B-CLL and find that it can activate the p53 pathway and effectively induce apoptosis in cells with wild-type p53, including cells with dysfunctional ataxia telangiectasia mutated, but not mutant p53. Nutlin-3 stabilized p53 and induced p53 target genes, including MDM2, p21(CIP1), PUMA, BAX, PIG3, and WIG1. Nutlin-3 synergized with the genotoxic drugs doxorubicin, chlorambucil, and fludarabine, but not with acadesine, which induces p53-independent apoptosis. Normal human T cells showed lower sensitivity to nutlin-3 than B-CLL cells and no synergism with the genotoxic drugs. These results suggest that MDM2 antagonists alone or in combination with chemotherapeutic drugs may offer a new treatment option for B-CLL.Blood 06/2006; 107(10):4109-14. · 9.90 Impact Factor -
Article: Re: Prognostic significance of a short sequence insertion in the MCL-1 promoter in chronic lymphocytic leukemia.
CancerSpectrum Knowledge Environment 08/2005; 97(14):1090-1; author reply 1093-5. · 14.07 Impact Factor -
Article: Transcriptional and translational control of Mcl-1 during apoptosis.
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ABSTRACT: Mcl-1 is an antiapoptotic member of the Bcl-2 family whose protein and mRNA have a short half-life. In this report, we studied the changes in Mcl-1 protein and mRNA expression induced by staurosporine and aspirin. Both drugs induced apoptosis in Jurkat cells and reduced the levels of Mcl-1 protein. The caspase inhibitor Z-VAD.fmk and the proteasome inhibitor MG132 partially protected Mcl-1 from decay, indicating that both caspase-dependent and proteasome pathways are involved during apoptosis. Staurosporine also reduced Mcl-1 mRNA levels and this reduction was mostly caspase-dependent. In addition, staurosporine reduced the transcriptional activity of the Mcl-1 promoter fused to a luciferase gene reporter more than actinomycin D, a general inhibitor of transcription. Thus, we conclude that staurosporine down-regulates Mcl-1 mRNA levels by inhibiting transcription in a caspase-dependent manner and reduces Mcl-1 protein levels by a caspase-independent post-transcriptional mechanism. In contrast aspirin, at doses and times that induced loss of viability and decay of Mcl-1 protein, had no effect on Mcl-1 mRNA levels. Aspirin rapidly inhibited de novo protein synthesis before caspase activation. Moreover, the translational factor eIF2alpha was transiently phosphorylated and therefore inhibited very soon after aspirin treatment. Aspirin also inhibited the luciferase reporter activity of several attached promoter constructs, but it did not affect the luciferase activity of a construct containing an internal ribosome entry site (IRES) in its mRNA 5(')UTR. We conclude that staurosporine inhibits transcription and translation, whereas aspirin only inhibits cap-dependent translation. Treatment with cycloheximide, at doses that inhibit protein synthesis without affecting cell viability, also induced Mcl-1 protein decay. Mcl-1 disappearance might be necessary but not sufficient for the induction of apoptosis by staurosporine and aspirin. A model for the control of Mcl-1 during drug-induced apoptosis is presented.Archives of Biochemistry and Biophysics 10/2003; 417(2):141-52. · 2.93 Impact Factor
Top co-authors
Top Journals
- British Journal of Haematology (2)
- Apoptosis (2)
- Haematologica (2)
- Archives of Biochemistry and Biophysics (1)
- Blood (1)
Institutions
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2006–2012
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University of Barcelona
- Departament de Ciències Fisiològiques II
Barcelona, Catalonia, Spain
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