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Bissa M, Galli V, Schifanella L, Vaccari M, Rahman MA, Gorini G, Binello N, Sarkis S, Gutowska A, Silva de Castro I, Doster MN, Moles R, Ferrari G, Shen X, Tomaras GD, Montefiori DC, N’guessan KF, Paquin-Proulx D, Kozlowski PA, Venzon DJ, Choo-Wosoba H, Breed MW, Kramer J, Franchini G. In Vivo Treatment with Insulin-like Growth Factor 1 Reduces CCR5 Expression on Vaccine-Induced Activated CD4 + T-Cells. Vaccines (Basel) 2023; 11:1662. [PMID: 38005994 PMCID: PMC10675829 DOI: 10.3390/vaccines11111662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 10/12/2023] [Accepted: 10/25/2023] [Indexed: 11/26/2023] Open
Abstract
At the heart of the DNA/ALVAC/gp120/alum vaccine's efficacy in the absence of neutralizing antibodies is a delicate balance of pro- and anti-inflammatory immune responses that effectively decreases the risk of SIVmac251 acquisition in macaques. Vaccine efficacy is linked to antibodies recognizing the V2 helical conformation, DC-10 tolerogenic dendritic cells eliciting the clearance of apoptotic cells via efferocytosis, and CCR5 downregulation on vaccine-induced gut homing CD4+ cells. RAS activation is also linked to vaccine efficacy, which prompted the testing of IGF-1, a potent inducer of RAS activation with vaccination. We found that IGF-1 changed the hierarchy of V1/V2 epitope recognition and decreased both ADCC specific for helical V2 and efferocytosis. Remarkably, IGF-1 also reduced the expression of CCR5 on vaccine-induced CD4+ gut-homing T-cells, compensating for its negative effect on ADCC and efferocytosis and resulting in equivalent vaccine efficacy (71% with IGF-1 and 69% without).
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Affiliation(s)
- Massimiliano Bissa
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
| | - Veronica Galli
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
| | - Luca Schifanella
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
| | - Monica Vaccari
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
- Tulane National Primate Center & School of Medicine, Tulane University, Covington, LA 70118, USA
| | - Mohammad Arif Rahman
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
| | - Giacomo Gorini
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
| | - Nicolò Binello
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
| | - Sarkis Sarkis
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
| | - Anna Gutowska
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
| | - Isabela Silva de Castro
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
| | - Melvin N. Doster
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
| | - Ramona Moles
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
| | - Guido Ferrari
- Division of Surgical Sciences, Department of Surgery, Duke University School of Medicine, Durham, NC 27710, USA
| | - Xiaoying Shen
- Division of Surgical Sciences, Department of Surgery, Duke University School of Medicine, Durham, NC 27710, USA
| | - Georgia D. Tomaras
- Division of Surgical Sciences, Department of Surgery, Duke University School of Medicine, Durham, NC 27710, USA
| | - David C. Montefiori
- Division of Surgical Sciences, Department of Surgery, Duke University School of Medicine, Durham, NC 27710, USA
| | - Kombo F. N’guessan
- US Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD 20817, USA
| | - Dominic Paquin-Proulx
- US Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD 20817, USA
| | - Pamela A. Kozlowski
- Department of Microbiology, Immunology and Parasitology, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
| | - David J. Venzon
- Biostatistics and Data Management Section, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Hyoyoung Choo-Wosoba
- Biostatistics and Data Management Section, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892, USA
| | - Matthew W. Breed
- Laboratory Animal Sciences Program, Leidos Biomedical Research Inc., Frederick National Laboratory, Frederick, MD 21701, USA
| | - Joshua Kramer
- Laboratory Animal Sciences Program, Leidos Biomedical Research Inc., Frederick National Laboratory, Frederick, MD 21701, USA
| | - Genoveffa Franchini
- Animal Models and Retroviral Vaccines Section, National Cancer Institute, Bethesda, MD 20892, USA
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Increased Retinal Ganglion Cell Survival by Exogenous IL-2 Depends on IL-10, Dopamine D1 Receptors, and Classical IL-2/IL-2R Signaling Pathways. Neurochem Res 2021; 46:1701-1716. [PMID: 33792824 DOI: 10.1007/s11064-021-03313-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 03/01/2021] [Accepted: 03/24/2021] [Indexed: 10/21/2022]
Abstract
Interleukin-2 (IL-2) is a classical pro-inflammatory cytokine known to display neuroprotective roles in the central nervous system including the retina. In the present study, we investigate the molecular targets involved in the neurotrophic effect of IL-2 on retinal ganglion cells (RGC) after optic nerve axotomy. Analysis of retrograde labeling of RGC showed that common cell survival mediators, as Trk receptors, Src, PI3K, PKC, and intracellular calcium do not mediate the neurotrophic effect of IL-2 on RGC. No involvement of MAPK p38 was also observed. However, other MAPKs as MEK and JNK appear to be mediating this IL-2 effect. Our data also indicate that JAK2/3 are important intracellular proteins for the IL-2 effect. Interestingly, we demonstrate that the IL-2 effect depends on dopamine D1 receptors (D1R), the cAMP/PKA pathway, interleukin-10 (IL-10), and NF-κB, suggesting that RGC survival induced by IL-2 encompasses a molecular network of major complexity. In addition, treatment of retinal cells with recombinant IL-10 or 6-Cl-pb (D1R full agonist) was able to increase RGC survival similar to IL-2. Taken together, our results suggest that after optic nerve axotomy, the increase in RGC survival triggered by IL-2 is mediated by IL-10 and D1R along with the intracellular pathways of MAPKs, JAK/STAT, and cAMP/PKA.
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Yi L, Weifan Y, Huan Y. Chimeric antigen receptor-engineered regulatory T lymphocytes: promise for immunotherapy of autoimmune disease. Cytotherapy 2019; 21:925-934. [PMID: 31105041 DOI: 10.1016/j.jcyt.2019.04.060] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 02/01/2019] [Accepted: 04/28/2019] [Indexed: 02/06/2023]
Abstract
Regulatory T lymphocytes (Tregs) exist as natural ideal immunosuppressors in the immune system. Autologous or allogeneic Treg transfusion therapy has been carried out in animal models and humans as a new strategy for treating autoimmune disease. Recent studies have shown that Tregs can be engineered with chimeric antigen receptors to be antigen-specific, which are more effective than polyclonal Tregs with fewer target limitations and a lack of major histocompatibility complex restriction. This review describes the potential for applying chimeric antigen receptor-engineered regulatory T cells in autoimmune diseases.
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Affiliation(s)
- Li Yi
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Yin Weifan
- Department of Neurology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China.
| | - Yang Huan
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan, China.
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Dybko J, Haus O, Jazwiec B, Urbaniak J, Wozniak M, Kaczmar-Dybko A, Urbaniak-Kujda D, Kapelko-Slowik K, Kuliczkowski K. CD117 (c-kit) expression on CD34+ cells participates in the cytogenetic response to imatinib in patients with chronic myeloid leukemia in the first chronic phase. Acta Haematol 2014; 132:166-71. [PMID: 24577437 DOI: 10.1159/000357373] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 11/11/2013] [Indexed: 11/19/2022]
Abstract
BACKGROUND Chronic myeloid leukemia (CML) biology seemed to be perfectly explored especially at the beginning of the tyrosine kinase inhibitors era. Later years with imatinib and second-generation tyrosine kinase inhibitors showed a variety of resistance mechanisms and it became obvious that the bcr-abl chimeric gene is not the only enemy to fight. Some studies assumed the decreased rate of programmed cell death (apoptotic) to be the primary mechanism by which BCR-ABL affects expansion of the leukemic clone in CML. Therefore, the aim of this study was to investigate the role of c-kit inhibition in treatment response. METHODS Cytogenetic analysis, real-time quantitative reverse-transcriptase polymerase chain reaction, flow-cytometric analysis and imatinib serum level quantification were applied. RESULTS The percentage of CD34+ cells expressing c-kit (CD117) isolated from bone marrow samples of 54 CML patients treated with standard-dose imatinib was significantly lower among imatinib responders. The fraction of apoptotic CD34+CD117+ cells in this patient group was significantly higher than in nonresponders. CONCLUSION To achieve optimal treatment response in CML patients, the elimination of CD34+CD117+ may be necessary through an apoptotic pathway.
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Koulnis M, Porpiglia E, Hidalgo D, Socolovsky M. Erythropoiesis: from molecular pathways to system properties. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 844:37-58. [PMID: 25480636 DOI: 10.1007/978-1-4939-2095-2_3] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Erythropoiesis is regulated through a long-range negative feedback loop, whereby tissue hypoxia stimulates erythropoietin (Epo) secretion, which promotes an increase in erythropoietic rate. However, this long-range feedback loop, by itself, cannot account for the observed system properties of erythropoiesis, namely, a wide dynamic range, stability in the face of random perturbations, and a rapid stress response. Here, we show that three Epo-regulated erythroblast survival pathways each give rise to distinct system properties. The induction of Bcl-xL by signal transducer and activator of transcription 5 (Stat5) is responsive to the rate of change in Epo levels, rather than to its absolute level, and is therefore maximally but transiently activated in acute stress. By contrast, Epo-mediated suppression of the pro-survival Fas and Bim pathways is proportional to the levels of stress/Epo and persists throughout chronic stress. Together, these elements operate in a manner reminiscent of a "proportional-integral-derivative (PID)" feedback controller frequently found in engineering applications. A short-range negative autoregulatory loop within the early erythroblast compartment, operated by Fas/FasL, filters out random noise and controls a reserve pool of early erythroblasts that is poised to accelerate the response to acute stress. Both these properties have previously been identified as inherent to negative regulatory motifs. Finally, we show that signal transduction by Stat5 combines binary and graded modalities, thereby increasing signaling fidelity over the wide dynamic range of Epo found in health and disease.
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Affiliation(s)
- Miroslav Koulnis
- Department of Cancer Biology, University of Massachusetts Medical School, 364 Plantation Street, Lazare Research Building (LRB) Room 440A, 01605, Worcester, MA, USA,
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Lai YG, Hou MS, Lo A, Huang ST, Huang YW, Yang-Yen HF, Liao NS. IL-15 modulates the balance between Bcl-2 and Bim via a Jak3/1-PI3K-Akt-ERK pathway to promote CD8αα+intestinal intraepithelial lymphocyte survival. Eur J Immunol 2013; 43:2305-16. [DOI: 10.1002/eji.201243026] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Revised: 05/20/2013] [Accepted: 06/06/2013] [Indexed: 12/20/2022]
Affiliation(s)
- Yein-Gei Lai
- Institute of Molecular Biology; Academia Sinica; Taipei Taiwan
- Graduate Institute of Life Sciences; National Defense Medical Center; Taipei Taiwan
| | - Mau-Sheng Hou
- Institute of Molecular Biology; Academia Sinica; Taipei Taiwan
- Molecular Cell Biology; Taiwan International Graduate Program; Graduate Institute of Life Sciences; National Defense Medical Center and Academia Sinica; Taipei Taiwan
| | - Albert Lo
- Institute of Molecular Biology; Academia Sinica; Taipei Taiwan
| | - Shih-Ting Huang
- Institute of Molecular Biology; Academia Sinica; Taipei Taiwan
| | - Yen-Wen Huang
- Institute of Molecular Biology; Academia Sinica; Taipei Taiwan
| | | | - Nan-Shih Liao
- Institute of Molecular Biology; Academia Sinica; Taipei Taiwan
- Graduate Institute of Life Sciences; National Defense Medical Center; Taipei Taiwan
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Abstract
The ErbB4 receptor tyrosine kinase possesses both tumour suppressor and oncogenic activities. Thus pharmacological agents are needed to help elucidate ErbB4 functions. However, limitations of existing ErbB4 agonists and antagonists have led us to seek novel ErbB4 antagonists. The Q43L mutant of the ErbB4 agonist NRG2β (neuregulin 2β) stimulates ErbB4 tyrosine phosphorylation, yet fails to stimulate ErbB4 coupling to cell proliferation. Thus in the present paper we hypothesize that NRG2β/Q43L may be an ErbB4 antagonist. NRG2β/Q43L competitively antagonizes agonist stimulation of ErbB4 coupling to cell proliferation. NRG2β/Q43L stimulates less ErbB4 tyrosine phosphorylation than does NRG2β. In addition, NRG2β stimulation of cell proliferation requires PI3K (phosphoinositide 3-kinase) activity and NRG2β stimulates greater Akt phosphorylation than does NRG2β/Q43L. Moreover, EGFR [EGF (epidermal growth factor) receptor] kinase activity (but not that of ErbB4) is critical for coupling ErbB4 to proliferation. Experiments utilizing ErbB4 splicing isoforms and mutants suggest that NRG2β and NRG2β/Q43L may differentially stimulate ErbB4 coupling to the transcriptional co-regulator YAP (Yes-associated protein). Finally, NRG2β/Q43L competitively antagonizes agonist stimulation of EGFR and ErbB2/ErbB3, indicating that NRG2β/Q43L is a pan-ErbB antagonist. Thus we postulate that NRG2β/Q43L and other antagonistic ligands stimulate ErbB tyrosine phosphorylation on a set of residues distinct from that stimulated by agonists, thus suggesting a novel mechanism of ErbB receptor regulation. Moreover, NRG2β/Q43L and related ligand-based antagonists establish a paradigm for the discovery of anti-ErbB therapeutics.
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Mandal D, Fu P, Levine AD. RETRACTED: REDOX regulation of IL-13 signaling in intestinal epithelial cells: usage of alternate pathways mediates distinct gene expression patterns. Cell Signal 2010; 22:1485-94. [PMID: 20570727 PMCID: PMC3006087 DOI: 10.1016/j.cellsig.2010.05.017] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2009] [Revised: 05/24/2010] [Accepted: 05/30/2010] [Indexed: 01/02/2023]
Abstract
In the classic view interleukin-13 (IL-13) binds to a heterodimer protein complex of the IL-13Ralpha1 and IL-4Ralpha chains and signals through a Janus kinase 1 (JAK1)-signal transducer and activator of transcription 6 (STAT6) mechanism. We recently reported that IL-13 also signals through the IL-13Ralpha2 chain initiating all three mitogen activated protein kinase (MAPK) pathways, and the relative expression of IL-13Ralpha1 and IL-13Ralpha2 modulates one another's transduction pathway. Therefore we investigated whether generation of reactive oxygen species (ROS) as second messengers may serve as a common nexus between these two pathways emanating from the individual IL-13 receptor chains in intestinal epithelial cells (IEC). IL-13 stimulates intracellular ROS synthesis within 5min via IL-13Ralpha1-JAK1-STAT6- and IL-13Ralpha2-MEK1/2-ERK1/2-dependent activation of nicotinamide adenine dinucleotide phosphate (NADPH) oxidase-1 (NOX-1). IL-13-induced ROS generation in turn positively regulates phosphorylation of ERK1/2 and STAT6, yielding a feed forward amplification loop. IL-13 also stimulates the stable, long-term gene expression of two other NADPH oxidases, NOX-4 and DUOX-2, which along with constitutive NOX-1, might facilitate elevated, continuous production of ROS in IL-13-activated IEC. The contribution of each signal transduction pathway initiated by IL-13 engagement to such biological functions as wound healing, inflammation, and apoptosis was mapped for representative, responsive genes. Distinct usage patterns were observed, demonstrating not only that IL-13 signal transduction through STAT6, MAPK, and ROS is regulated in both an antagonistic and cyclic fashion, but also that each pathway plays a specific role in modulating the wound healing and anti-apoptotic capabilities of the intestinal epithelium.
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Affiliation(s)
- Debasmita Mandal
- Department of Pathology, 10900 Euclid Avenue, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106-4952
| | - Pingfu Fu
- Departments of Epidemiology and Biostatics, 10900 Euclid Avenue, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106-4952
- Case Comprehensive Cancer Center, 10900 Euclid Avenue, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106-4952
| | - Alan D. Levine
- Department of Pathology, 10900 Euclid Avenue, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106-4952
- Departments of Medicine, Pharmacology, 10900 Euclid Avenue, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106-4952
- Case Comprehensive Cancer Center, 10900 Euclid Avenue, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106-4952
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Interleukin-7 regulates Bim proapoptotic activity in peripheral T-cell survival. Mol Cell Biol 2009; 30:590-600. [PMID: 19933849 DOI: 10.1128/mcb.01006-09] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Interleukin-7 (IL-7) is critical for T-cell development and peripheral T-cell homeostasis. The survival of pro-T cells and mature T cells requires IL-7. The survival function of IL-7 is accomplished partly through induction of the antiapoptotic protein Bcl-2 and inhibition of proapoptotic proteins Bax and Bad. We show here that the proapoptotic protein Bim, a BH3-only protein belonging to the Bcl-2 family, also plays a role in peripheral T-cell survival. Deletion of Bim partially protected an IL-7-dependent T-cell line and peripheral T cells, especially cells with an effector memory phenotype, from IL-7 deprivation. However, T-cell development in the thymus was not restored in IL-7(-/-) Rag2(-/-) mice reconstituted with Bim(-/-) bone marrow. IL-7 withdrawal altered neither the intracellular location of Bim, which was constitutively mitochondrial, nor its association with Bcl-2; however, a reduction in its association with the prosurvival protein Mcl-1 was observed. IL-7 withdrawal did not increase Bim mRNA or protein expression but did induce changes in the isoelectric point of Bim(EL) and its reactivity with an antiphosphoserine antibody. Our findings suggest that the maintenance of peripheral T cells by IL-7 occurs partly through inhibition of Bim activity at the posttranslational level.
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Belloc F, Airiau K, Jeanneteau M, Garcia M, Guérin E, Lippert E, Moreau-Gaudry F, Mahon FX. The stem cell factor–c-KIT pathway must be inhibited to enable apoptosis induced by BCR–ABL inhibitors in chronic myelogenous leukemia cells. Leukemia 2009; 23:679-85. [DOI: 10.1038/leu.2008.364] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kuroda J, Taniwaki M. Involvement of BH3-only proteins in hematologic malignancies. Crit Rev Oncol Hematol 2008; 71:89-101. [PMID: 19022681 DOI: 10.1016/j.critrevonc.2008.10.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2008] [Revised: 09/18/2008] [Accepted: 10/09/2008] [Indexed: 12/25/2022] Open
Abstract
The interaction between anti-apoptotic and pro-apoptotic members of the Bcl-2 family proteins determines life or death for cancer cells. In this context, BH3-only proteins (such as Bim), members of the pro-apoptotic Bcl-2 family proteins, act as key initiators of apoptosis by activating Bax and Bak through liberating them from anti-apoptotic Bcl-2 members. This then leads to the disruption of mitochondrial outer membrane, and eventually promotes proteolytic cascades for cellular dismantling. We here review the growing evidence of how BH3-only proteins are involved in tumorigenesis and in apoptosis induced by anti-cancer agents in hematologic malignancies. A deeper understanding of the roles of BH3-only proteins in cell death regulation may yield crucial insights for the further development of more effective and rational cell killing strategies. Recent developments in the direct therapeutic manipulation of Bcl-2 proteins using BH3-mimicking agents, such as ABT-737 or GX15-070, for hematologic malignancies are also summarized.
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Affiliation(s)
- Junya Kuroda
- Division of Hematology and Oncology, Department of Medicine, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kamigyo-ku, Kyoto 602-8566, Japan.
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Maréchal Y, Pesesse X, Jia Y, Pouillon V, Pérez-Morga D, Daniel J, Izui S, Cullen PJ, Leo O, Luo HR, Erneux C, Schurmans S. Inositol 1,3,4,5-tetrakisphosphate controls proapoptotic Bim gene expression and survival in B cells. Proc Natl Acad Sci U S A 2007; 104:13978-83. [PMID: 17709751 PMCID: PMC1955816 DOI: 10.1073/pnas.0704312104] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The contribution of the B isoform of inositol 1,4,5-trisphosphate [Ins(1,4,5)P(3)] 3-kinase (or Itpkb) and inositol 1,3,4,5-tetrakisphosphate [Ins(1,3,4,5)P(4)], its reaction product, to B cell function and development remains unknown. Here, we show that mice deficient in Itpkb have defects in B cell survival leading to specific and intrinsic developmental alterations in the B cell lineage and antigen unresponsiveness in vivo. The decreased B cell survival is associated with a decreased phosphorylation of Erk1/2 and increased Bim gene expression. B cell survival, development, and antigen responsiveness are normalized in parallel to reduced expression of Bim in Itpkb(-/-) Bim(+/-) mice. Analysis of the signaling pathway downstream of Itpkb revealed that Ins(1,3,4,5)P(4) regulates subcellular distribution of Rasa3, a Ras GTPase-activating protein acting as an Ins(1,3,4,5)P(4) receptor. Together, our results indicate that Itpkb and Ins(1,3,4,5)P(4) mediate a survival signal in B cells via a Rasa3-Erk signaling pathway controlling proapoptotic Bim gene expression.
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Affiliation(s)
- Yoann Maréchal
- *Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire, Faculté de Médecine, Laboratoires de
| | - Xavier Pesesse
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire, Campus Erasme, Faculté de Médecine, Université Libre de Bruxelles, Route de Lennik 808, 1070 Bruxelles, Belgium
| | - Yonghui Jia
- Department of Pathology, Joint Program in Transfusion Medicine, Harvard Medical School, and Department of Laboratory Medicine, Children's Hospital Boston, Boston, MA 02115
| | - Valérie Pouillon
- *Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire, Faculté de Médecine, Laboratoires de
| | | | - Julien Daniel
- Physiologie Animale, Faculté des Sciences, Institut de Biologie et de Médecine Moléculaires, Université Libre de Bruxelles, Rue des Professeurs Jeener et Brachet 12, 6041 Gosselies, Belgium
| | - Shozo Izui
- Department of Pathology and Immunology, Centre Médical Universitaire, Faculté de Médecine, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland; and
| | - Peter J. Cullen
- **Henry Wellcome Integrated Signaling Laboratories, Department of Biochemistry, School of Medical Sciences, University of Bristol, Bristol BS8 1TD, United Kingdom
| | - Oberdan Leo
- Physiologie Animale, Faculté des Sciences, Institut de Biologie et de Médecine Moléculaires, Université Libre de Bruxelles, Rue des Professeurs Jeener et Brachet 12, 6041 Gosselies, Belgium
| | - Hongbo R. Luo
- Department of Pathology, Joint Program in Transfusion Medicine, Harvard Medical School, and Department of Laboratory Medicine, Children's Hospital Boston, Boston, MA 02115
| | - Christophe Erneux
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire, Campus Erasme, Faculté de Médecine, Université Libre de Bruxelles, Route de Lennik 808, 1070 Bruxelles, Belgium
| | - Stéphane Schurmans
- *Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire, Faculté de Médecine, Laboratoires de
- To whom correspondence should be addressed. E-mail:
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Matsui H, Asou H, Inaba T. Cytokines direct the regulation of Bim mRNA stability by heat-shock cognate protein 70. Mol Cell 2007; 25:99-112. [PMID: 17218274 DOI: 10.1016/j.molcel.2006.12.007] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2006] [Revised: 11/05/2006] [Accepted: 12/12/2006] [Indexed: 10/23/2022]
Abstract
Previous gene-targeting studies indicated that Bim, a BH3-only death activator, regulates total blood cell number. Cytokines contribute to this process by negatively regulating steady-state levels of Bim mRNA. Here we present a molecular mechanism for cytokine-mediated posttranscriptional regulation of Bim mRNA by heat-shock cognate protein 70 (Hsc70), which binds to AU-rich elements (AREs) in the 3'-untranslated region of specific mRNAs and enhances their stability. The RNA binding potential of Hsc70 is regulated by cochaperones including Bag-4 (also SODD), CHIP, Hip, and Hsp40. Cytokines regulate the expression or function of these cochaperones by activating Ras pathways. Thus, exposure of cells to cytokines ultimately leads to destabilization of Bim mRNA and promotion of cell survival. This unanticipated role of a chaperone/cochaperone complex in mRNA stability appears to be critical for hematopoiesis and leukemogenesis.
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Affiliation(s)
- Hirotaka Matsui
- Department of Molecular Oncology and Leukemia Program Project, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima 734-8553, Japan
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Aichberger KJ, Mayerhofer M, Krauth MT, Vales A, Kondo R, Derdak S, Pickl WF, Selzer E, Deininger M, Druker BJ, Sillaber C, Esterbauer H, Valent P. Low-level expression of proapoptotic Bcl-2-interacting mediator in leukemic cells in patients with chronic myeloid leukemia: role of BCR/ABL, characterization of underlying signaling pathways, and reexpression by novel pharmacologic compounds. Cancer Res 2005; 65:9436-44. [PMID: 16230407 DOI: 10.1158/0008-5472.can-05-0972] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Chronic myeloid leukemia (CML) is a myeloproliferative disease in which BCR/ABL enhances survival of leukemic cells through modulation of proapoptotic and antiapoptotic molecules. Recent data suggest that proapoptotic Bcl-2-interacting mediator (Bim) plays a role as a tumor suppressor in myeloid cells, and that leukemic cells express only low amounts of this cell death activator. We here show that primary CML cells express significantly lower amounts of bim mRNA and Bim protein compared with normal cells. The BCR/ABL inhibitors imatinib and AMN107 were found to promote expression of Bim in CML cells. To provide direct evidence for the role of BCR/ABL in Bim modulation, we employed Ba/F3 cells with doxycycline-inducible expression of BCR/ABL and found that BCR/ABL decreases expression of bim mRNA and Bim protein in these cells. The BCR/ABL-induced decrease in expression of Bim was found to be a posttranscriptional event that depended on signaling through the mitogen-activated protein kinase pathway and was abrogated by the proteasome inhibitor MG132. Interestingly, MG132 up-regulated the expression of bim mRNA and Bim protein and suppressed the growth of Ba/F3 cells containing wild-type BCR/ABL or imatinib-resistant mutants of BCR/ABL. To show functional significance of "Bim reexpression," a Bim-specific small interfering RNA was applied and found to rescue BCR/ABL-transformed leukemic cells from imatinib-induced cell death. In summary, our data identify BCR/ABL as a Bim suppressor in CML cells and suggest that reexpression of Bim by novel tyrosine kinase inhibitors, proteasome inhibition, or by targeting signaling pathways downstream of BCR/ABL may be an attractive therapeutic approach in imatinib-resistant CML.
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MESH Headings
- Antineoplastic Agents/pharmacology
- Apoptosis/drug effects
- Apoptosis/physiology
- Apoptosis Regulatory Proteins/biosynthesis
- Apoptosis Regulatory Proteins/genetics
- Bcl-2-Like Protein 11
- Benzamides
- Bone Marrow Cells/metabolism
- Cell Growth Processes/drug effects
- Down-Regulation
- Extracellular Signal-Regulated MAP Kinases/metabolism
- Fusion Proteins, bcr-abl/physiology
- Humans
- Imatinib Mesylate
- K562 Cells
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/drug therapy
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/genetics
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/metabolism
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/pathology
- Leupeptins/pharmacology
- MAP Kinase Signaling System/drug effects
- Membrane Proteins/biosynthesis
- Membrane Proteins/genetics
- Piperazines/pharmacology
- Proteasome Endopeptidase Complex/metabolism
- Proto-Oncogene Proteins/biosynthesis
- Proto-Oncogene Proteins/genetics
- Proto-Oncogene Proteins c-bcl-2/metabolism
- Pyrimidines/pharmacology
- RNA, Messenger/biosynthesis
- RNA, Messenger/genetics
- RNA, Small Interfering/genetics
- Signal Transduction
- Transfection
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Affiliation(s)
- Karl J Aichberger
- Department of Internal Medicine I, Division of Hematology and Hemostaseology- the Center of Excellence in Clinical and Experimental Oncology
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