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Kim DJ, Yi YW, Seong YS. Beta-Transducin Repeats-Containing Proteins as an Anticancer Target. Cancers (Basel) 2023; 15:4248. [PMID: 37686524 PMCID: PMC10487276 DOI: 10.3390/cancers15174248] [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: 07/31/2023] [Revised: 08/22/2023] [Accepted: 08/23/2023] [Indexed: 09/10/2023] Open
Abstract
Beta-transducin repeat-containing proteins (β-TrCPs) are E3-ubiquitin-ligase-recognizing substrates and regulate proteasomal degradation. The degradation of β-TrCPs' substrates is tightly controlled by various external and internal signaling and confers diverse cellular processes, including cell cycle progression, apoptosis, and DNA damage response. In addition, β-TrCPs function to regulate transcriptional activity and stabilize a set of substrates by distinct mechanisms. Despite the association of β-TrCPs with tumorigenesis and tumor progression, studies on the mechanisms of the regulation of β-TrCPs' activity have been limited. In this review, we studied publications on the regulation of β-TrCPs themselves and analyzed the knowledge gaps to understand and modulate β-TrCPs' activity in the future.
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Affiliation(s)
- Dong Joon Kim
- Department of Microbiology, College of Medicine, Dankook University, Cheonan-si 31116, Chungcheongnam-do, Republic of Korea;
- Multidrug-Resistant Refractory Cancer Convergence Research Center (MRCRC), Dankook University, Cheonan-si 31116, Chungcheongnam-do, Republic of Korea
- Department of Pathophysiology, School of Basic Medical Sciences, Academy of Medical Science, College of Medicine, Zhengzhou University, Zhengzhou 450008, China
- China-US (Henan) Hormel Cancer Institute, Zhengzhou 450008, China
| | - Yong Weon Yi
- Multidrug-Resistant Refractory Cancer Convergence Research Center (MRCRC), Dankook University, Cheonan-si 31116, Chungcheongnam-do, Republic of Korea
- Department of Biochemistry, College of Medicine, Dankook University, Cheonan-si 31116, Chungcheongnam-do, Republic of Korea
| | - Yeon-Sun Seong
- Multidrug-Resistant Refractory Cancer Convergence Research Center (MRCRC), Dankook University, Cheonan-si 31116, Chungcheongnam-do, Republic of Korea
- Department of Biochemistry, College of Medicine, Dankook University, Cheonan-si 31116, Chungcheongnam-do, Republic of Korea
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Peng T, Wonganan O, Zhang Z, Yu J, Xi R, Cao Y, Suksamrarn A, Zhang G, Wang F. A 2-Benzylmalonate Derivative as STAT3 Inhibitor Suppresses Tumor Growth in Hepatocellular Carcinoma by Upregulating β-TrCP E3 Ubiquitin Ligase. Int J Mol Sci 2021; 22:ijms22073354. [PMID: 33805945 PMCID: PMC8036434 DOI: 10.3390/ijms22073354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 03/15/2021] [Accepted: 03/22/2021] [Indexed: 11/16/2022] Open
Abstract
The aberrant activation of a signal transducer and activator of transcription 3 (STAT3) restrains type I interferon (IFN) α/β-induced antiviral responses and is associated with the development of cancer. Designing specific STAT3 inhibitors will thus provide new options for use as IFN therapy. Herein, we identified a novel small molecule, dimethyl 2-(4-(2-(methyl(phenyl(p-tolyl)methyl)amino)ethoxy)benzyl)malonate (CIB-6), which can inhibit the IFN-α-induced interferon stimulated response element (ISRE) luciferase reporter (IC50 value = 6.4 μM) and potentiate the antiproliferative effect of IFN-α in human hepatocellular carcinoma (HCC) cells. CIB-6 was found to bind to the STAT3 Src homology 2 (SH2) domain, thereby selectively inhibiting STAT3 phosphorylation without affecting Janus kinases and STAT1/2. CIB-6 also inhibited the migration and invasion of HCC cells by inhibiting the epithelial-mesenchymal transition (EMT) process. Mechanistically, CIB-6 reduced the expression of β-catenin (an EMT key protein) via upregulating β-transducin repeat-containing protein (β-TrCP) and curbed nuclear factor kappa-B (NF-κB) activation through restricting the phosphorylation of the inhibitor of NF-κB (IκB) kinase (IKK) via STAT3 inhibition. Treatment with CIB-6 significantly retarded tumor growth in nude mice with SK-HEP-1 xenografts. In addition, clinical sample analysis revealed that lower β-TrCP and higher β-catenin expression could affect the median survival time of HCC patients. Our findings suggest that CIB-6 could be a new therapeutic strategy for HCC therapy through STAT3-mediated β-TrCP/β-catenin/NF-κB axis.
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Affiliation(s)
- Ting Peng
- Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China; (T.P.); (O.W.); (J.Y.); (R.X.); (Y.C.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Orawan Wonganan
- Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China; (T.P.); (O.W.); (J.Y.); (R.X.); (Y.C.)
| | - Zhonghui Zhang
- School of Chemistry Engineering, Sichuan University, Chengdu 610041, China;
| | - Jialing Yu
- Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China; (T.P.); (O.W.); (J.Y.); (R.X.); (Y.C.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ruiying Xi
- Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China; (T.P.); (O.W.); (J.Y.); (R.X.); (Y.C.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yu Cao
- Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China; (T.P.); (O.W.); (J.Y.); (R.X.); (Y.C.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Apichart Suksamrarn
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ramkhamhaeng University, Bangkok 10240, Thailand;
| | - Guolin Zhang
- Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China; (T.P.); (O.W.); (J.Y.); (R.X.); (Y.C.)
- Correspondence: (G.Z.); (F.W.); Tel.: +86-28-82890333 (G.Z.); +86-28-82890651 (F.W.)
| | - Fei Wang
- Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China; (T.P.); (O.W.); (J.Y.); (R.X.); (Y.C.)
- Xiongan Institute of Innovation, Chinese Academy of Sciences, Hebei 071700, China
- Correspondence: (G.Z.); (F.W.); Tel.: +86-28-82890333 (G.Z.); +86-28-82890651 (F.W.)
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Shah K, Ahmed M, Kazi JU. The Aurora kinase/β-catenin axis contributes to dexamethasone resistance in leukemia. NPJ Precis Oncol 2021; 5:13. [PMID: 33597638 PMCID: PMC7889633 DOI: 10.1038/s41698-021-00148-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 01/12/2021] [Indexed: 02/07/2023] Open
Abstract
Glucocorticoids, such as dexamethasone and prednisolone, are widely used in cancer treatment. Different hematological malignancies respond differently to this treatment which, as could be expected, correlates with treatment outcome. In this study, we have used a glucocorticoid-induced gene signature to develop a deep learning model that can predict dexamethasone sensitivity. By combining gene expression data from cell lines and patients with acute lymphoblastic leukemia, we observed that the model is useful for the classification of patients. Predicted samples have been used to detect deregulated pathways that lead to dexamethasone resistance. Gene set enrichment analysis, peptide substrate-based kinase profiling assay, and western blot analysis identified Aurora kinase, S6K, p38, and β-catenin as key signaling proteins involved in dexamethasone resistance. Deep learning-enabled drug synergy prediction followed by in vitro drug synergy analysis identified kinase inhibitors against Aurora kinase, JAK, S6K, and mTOR that displayed synergy with dexamethasone. Combining pathway enrichment, kinase regulation, and kinase inhibition data, we propose that Aurora kinase or its several direct or indirect downstream kinase effectors such as mTOR, S6K, p38, and JAK may be involved in β-catenin stabilization through phosphorylation-dependent inactivation of GSK-3β. Collectively, our data suggest that activation of the Aurora kinase/β-catenin axis during dexamethasone treatment may contribute to cell survival signaling which is possibly maintained in patients who are resistant to dexamethasone.
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Affiliation(s)
- Kinjal Shah
- Division of Translational Cancer Research, Department of Laboratory Medicine, Lund University, Lund, Sweden
- Lund Stem Cell Center, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Mehreen Ahmed
- Division of Translational Cancer Research, Department of Laboratory Medicine, Lund University, Lund, Sweden
- Lund Stem Cell Center, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Julhash U Kazi
- Division of Translational Cancer Research, Department of Laboratory Medicine, Lund University, Lund, Sweden.
- Lund Stem Cell Center, Department of Laboratory Medicine, Lund University, Lund, Sweden.
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Khan I, Eklund EE, Gartel AL. Therapeutic Vulnerabilities of Transcription Factors in AML. Mol Cancer Ther 2020; 20:229-237. [PMID: 33158995 DOI: 10.1158/1535-7163.mct-20-0115] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 08/13/2020] [Accepted: 10/19/2020] [Indexed: 11/16/2022]
Abstract
Acute myeloid leukemia (AML) is characterized by impaired myeloid lineage differentiation, uncontrolled proliferation, and inhibition of proapoptotic pathways. In spite of a relatively homogeneous clinical disease presentation, risk of long-term survival in AML varies from 20% to 80% depending on molecular disease characteristics. In recognition of the molecular heterogeneity of AML, the European Leukemia Net (ELN) and WHO classification systems now incorporate cytogenetics and increasing numbers of gene mutations into AML prognostication. Several of the genomic AML subsets are characterized by unique transcription factor alterations that are highlighted in this review. There are many mechanisms of transcriptional deregulation in leukemia. We broadly classify transcription factors based on mechanisms of transcriptional deregulation including direct involvement of transcription factors in recurrent translocations, loss-of-function mutations, and intracellular relocalization. Transcription factors, due to their pleiotropic effects, have been attractive but elusive targets. Indirect targeting approaches include inhibition of upstream kinases such as TAK1 for suppression of NFκB signaling and downstream effectors such as FGF signaling in HOXA-upregulated leukemia. Other strategies include targeting scaffolding proteins like BrD4 in the case of MYC or coactivators such as menin to suppress HOX expression; disrupting critical protein interactions in the case of β-catenin:TCF/LEF, and preventing transcription factor binding to DNA as in the case of PU.1 or FOXM1. We comprehensively describe the mechanism of deregulation of transcription factors in genomic subsets of AML, consequent pathway addictions, and potential therapeutic strategies.
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Affiliation(s)
- Irum Khan
- Department of Medicine, University of Illinois, Chicago, Illinois
| | - Elizabeth E Eklund
- Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois.,Jesse Brown VA Medical Center, Chicago, Illinois
| | - Andrei L Gartel
- Department of Medicine, University of Illinois, Chicago, Illinois.
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Chen W, Wu G, Zhu Y, Zhang W, Zhang H, Zhou Y, Sun P. HOXA10 deteriorates gastric cancer through activating JAK1/STAT3 signaling pathway. Cancer Manag Res 2019; 11:6625-6635. [PMID: 31406476 PMCID: PMC6642621 DOI: 10.2147/cmar.s201342] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Accepted: 05/29/2019] [Indexed: 12/13/2022] Open
Abstract
Background: HOXA10 has been reported to be deregulated in many kinds of cancers including gastric cancer. But its role in gastric cancer progression is controversial. Therefore, the current study was performed to explore the role and mechanism of HOXA10 in gastric cancer. Materials and methods: IHC and Western blotting assays were used to assess HOXA10 expression in gastric cancer tissues and cells. Lentivirus infection was used to alter HOXA10, STAT3 and JAK1 expression in gastric cancer NCI-N87 and MKN28 cells. MTT, cloning formation, flow cytometry and in vivo xenotransplantation experiments were carried out to assess cell proliferation, cloning formation, apoptosis and tumorigenesis. Results: HOXA10 expression was obviously increased in gastric cancer tissues and cells when compared with the normal gastric tissue samples and cells. Upregulation of HOXA10 significantly enhanced cell proliferation, cloning formation and tumorigenesis abilities and reduced cell apoptosis in gastric cancer, and promoted the activation of JAK1/STAT3 signaling. In addition, we showed that the effects of HOXA10 on the promotion of cell viability and tumorigenesis and cell apoptosis repression were all weakened when JAK1 or STAT3 was downregulated. Conclusion: This study demonstrates that HOXA10 functions as an oncogene in gastric cancer through activating JAK1/STAT3 signaling.
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Affiliation(s)
- Wenchao Chen
- Department of Gastrointestinal Surgery, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, School of Clinical Medicine, Henan University, Zhengzhou, Henan 450003, People's Republic of China
| | - Gang Wu
- Department of Gastrointestinal Surgery, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, School of Clinical Medicine, Henan University, Zhengzhou, Henan 450003, People's Republic of China
| | - Yuanzeng Zhu
- Department of Gastrointestinal Surgery, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, School of Clinical Medicine, Henan University, Zhengzhou, Henan 450003, People's Republic of China
| | - Wei Zhang
- Department of Gastrointestinal Surgery, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, School of Clinical Medicine, Henan University, Zhengzhou, Henan 450003, People's Republic of China
| | - Han Zhang
- Department of Gastrointestinal Surgery, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, School of Clinical Medicine, Henan University, Zhengzhou, Henan 450003, People's Republic of China
| | - Yang Zhou
- Department of Gastrointestinal Surgery, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, School of Clinical Medicine, Henan University, Zhengzhou, Henan 450003, People's Republic of China
| | - Peichun Sun
- Department of Gastrointestinal Surgery, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, School of Clinical Medicine, Henan University, Zhengzhou, Henan 450003, People's Republic of China
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Targeting nuclear β-catenin as therapy for post-myeloproliferative neoplasm secondary AML. Leukemia 2018; 33:1373-1386. [PMID: 30575820 DOI: 10.1038/s41375-018-0334-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 09/23/2018] [Accepted: 10/16/2018] [Indexed: 01/14/2023]
Abstract
Transformation of post-myeloproliferative neoplasms into secondary (s) AML exhibit poor clinical outcome. In addition to increased JAK-STAT and PI3K-AKT signaling, post-MPN sAML blast progenitor cells (BPCs) demonstrate increased nuclear β-catenin levels and TCF7L2 (TCF4) transcriptional activity. Knockdown of β-catenin or treatment with BC2059 that disrupts binding of β-catenin to TBL1X (TBL1) depleted nuclear β-catenin levels. This induced apoptosis of not only JAKi-sensitive but also JAKi-persister/resistant post-MPN sAML BPCs, associated with attenuation of TCF4 transcriptional targets MYC, BCL-2, and Survivin. Co-targeting of β-catenin and JAK1/2 inhibitor ruxolitinib (rux) synergistically induced lethality in post-MPN sAML BPCs and improved survival of mice engrafted with human sAML BPCs. Notably, co-treatment with BET protein degrader ARV-771 and BC2059 also synergistically induced apoptosis and improved survival of mice engrafted with JAKi-sensitive or JAKi-persister/resistant post-MPN sAML cells. These preclinical findings highlight potentially promising anti-post-MPN sAML activity of the combination of β-catenin and BETP antagonists against post-MPN sAML BPCs.
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Park B, Lim JW, Kim H. Lycopene treatment inhibits activation of Jak1/Stat3 and Wnt/β-catenin signaling and attenuates hyperproliferation in gastric epithelial cells. Nutr Res 2018; 70:70-81. [PMID: 30098838 DOI: 10.1016/j.nutres.2018.07.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 07/05/2018] [Accepted: 07/19/2018] [Indexed: 12/19/2022]
Abstract
Helicobacter pylori (H pylori) colonizes the human stomach and increases the risk of gastric diseases including gastric cancer. H pylori increases reactive oxygen species (ROS), which activate Janus-activator kinase 1 (Jak1)/signal transducers and activators of transcription 3 (Stat3) in gastric epithelial cells. ROS mediate hyperproliferation, a hallmark of carcinogenesis, by activating Wnt/β-catenin signaling in various cells. Lycopene is a potent antioxidant exhibiting anticancer effects. We hypothesized that lycopene may inhibit H pylori-induced hyperproliferation by suppressing ROS-mediated activation of Jak1/Stat3 and Wnt/β-catenin signaling, and β-catenin target gene expression in gastric epithelial cells. We determined cell viability, ROS levels, and the protein levels of phospho- and total Jak1/Stat3, Wnt/β-catenin signaling molecules, Wnt-1, lipoprotein-related protein 5, and β-catenin target oncogenes (c-Myc and cyclin E) in H pylori-infected gastric epithelial AGS cells. The Jak1/Stat3 inhibitor AG490 served as the control treatment. The significance of the differences among groups was calculated using the 1-way analysis of variance followed by Newman-Keuls post hoc tests. The results show that lycopene reduced ROS levels and inhibited Jak1/Stat3 activation, alteration of Wnt/β-catenin multiprotein complex molecules, expression of c-Myc and cyclin E, and cell proliferation in H pylori-infected AGS cells. AG490 similarly inhibited H pylori-induced cell proliferation, alteration of Wnt/β-catenin multiprotein complex molecules, and oncogene expression. H pylori increased the levels of Wnt-1 and its receptor lipoprotein-related protein 5; this increase was inhibited by either lycopene or AG490 in AGS cells. In conclusion, lycopene inhibits ROS-mediated activation of Jak1/Stat3 and Wnt/β-catenin signaling and, thus, oncogene expression in relation to hyperproliferation in H pylori-infected gastric epithelial cells. Lycopene might be a potential and promising nutrient for preventing H pylori-associated gastric diseases including gastric cancer.
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Affiliation(s)
- Bohye Park
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul 03722, Korea.
| | - Joo Weon Lim
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul 03722, Korea.
| | - Hyeyoung Kim
- Department of Food and Nutrition, Brain Korea 21 PLUS Project, College of Human Ecology, Yonsei University, Seoul 03722, Korea.
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Perrotti D, Silvestri G, Stramucci L, Yu J, Trotta R. Cellular and Molecular Networks in Chronic Myeloid Leukemia: The Leukemic Stem, Progenitor and Stromal Cell Interplay. Curr Drug Targets 2017; 18:377-388. [PMID: 27307150 DOI: 10.2174/1389450117666160615074120] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2015] [Revised: 06/01/2016] [Accepted: 06/02/2016] [Indexed: 12/13/2022]
Abstract
The use of imatinib, second and third generation ABL tyrosine kinase inhibitors (TKI) (i.e. dasatinib, nilotinib, bosutinib and ponatinib) made CML a clinically manageable and, in a small percentage of cases, a cured disease. TKI therapy also turned CML blastic transformation into a rare event; however, disease progression still occurs in those patients who are refractory, not compliant with TKI therapy or develop resistance to multiple TKIs. In the past few years, it became clear that the BCRABL1 oncogene does not operate alone to drive disease emergence, maintenance and progression. Indeed, it seems that bone marrow (BM) microenvironment-generated signals and cell autonomous BCRABL1 kinase-independent genetic and epigenetic alterations all contribute to: i. persistence of a quiescent leukemic stem cell (LSC) reservoir, ii. innate or acquired resistance to TKIs, and iii. progression into the fatal blast crisis stage. Herein, we review the intricate leukemic network in which aberrant, but finely tuned, survival, mitogenic and self-renewal signals are generated by leukemic progenitors, stromal cells, immune cells and metabolic microenvironmental conditions (e.g. hypoxia) to promote LSC maintenance and blastic transformation.
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Affiliation(s)
- Danilo Perrotti
- Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, United States
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Gong M, Zhuo X, Ma A. STAT6 Upregulation Promotes M2 Macrophage Polarization to Suppress Atherosclerosis. Med Sci Monit Basic Res 2017; 23:240-249. [PMID: 28615615 PMCID: PMC5484610 DOI: 10.12659/msmbr.904014] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Background Macrophages are highly heterogeneous and plastic cells that are involved in all stages of atherogenesis. They can undergo polarization by shifting between M1 and M2 functional phenotypes. However, the role of macrophage polarization and the molecular mechanism in modulating atherosclerotic plaque stability remain incompletely understood. Our study investigated the role of STAT6 in regulating macrophage phenotypes to affect atherosclerotic plaque stability. Material/Methods A murine atherosclerosis model with vulnerable plaques was induced with high-cholesterol diet and PCCP surgeries in ApoE−/− mice. Murine macrophages RAW264.7 treated with ox-LDL or IL-4 were used to simulate the in vitro process. pcDNA3.1(−)/STAT6-expressing vectors were transfected into RAW264.7 to evaluate its effect on cell polarization and the involved molecules. Results Unstable plaques presented significantly increased M1 markers (CD86 and iNOS) and less M2 markers (Arg-1 and TGF-β) than the stable plaques. Moreover, we found that STAT6 and p-STAT6 were greatly decreased in the vulnerable plaques and ox-LDL-induced macrophages, while their expression was elevated after IL-4 stimulation. The overexpression of STAT6 substantially reversed the ox-LDL-stimulated macrophage apoptosis and lipid accumulation. STAT6 upregulation promoted the differentiation of macrophage to M2 subtype as reflected by the increased expression of Arg-1 and TGF-β. Furthermore, we found that STAT6 overexpression activated the Wnt-β-catenin signaling by enhancing the translocation of β-catenin, while β-catenin suppression inhibited STAT6 overexpression-induced M2 polarization. Conclusions STAT6 facilitated atherosclerotic plaque stabilization by promoting the polarization of macrophages to M2 subtype and antagonizing ox-LDL-induced cell apoptosis and lipid deposition in a Wnt-β-catenin-dependent manner.
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Affiliation(s)
- Min Gong
- Department of Cardiovascular Internal Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland).,Department of Cardiology, Xi'an Central Hospital, Xi'an, Shaanxi, China (mainland)
| | - Xiaozhen Zhuo
- Department of Cardiovascular Internal Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
| | - Aiqun Ma
- Department of Cardiovascular Internal Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China (mainland)
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Canonical Wnt/β-Catenin Signaling Pathway Is Dysregulated in Patients With Primary and Secondary Myelofibrosis. CLINICAL LYMPHOMA MYELOMA & LEUKEMIA 2016; 16:523-526. [PMID: 27381374 DOI: 10.1016/j.clml.2016.06.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 05/12/2016] [Accepted: 06/01/2016] [Indexed: 11/21/2022]
Abstract
INTRODUCTION β-Catenin is a central effector molecule of the canonical wingless-related integration site (Wnt) signaling pathway. It is important for maintenance of stem cell homeostasis and its aberrant activation has been implicated in a wide array of malignant hematological disorders. There are few reports suggesting its dysregulation in Philadelphia chromosome-negative (Ph-) myeloproliferative neoplasms (MPNs). PATIENTS AND METHODS We analyzed β-catenin mRNA expression in bone marrow (BM) aspirates of 29 patients with primary (PMF) and 4 patients with secondary, post Ph- MPN, myelofibrosis (SMF) using quantitative real-time polymerase chain reaction (qRT PCR). The control group consisted of 16 BM aspirates from patients with limited-stage aggressive non-Hodgkin lymphoma without BM involvement. We compared relative gene expression with clinical and hematological parameters. RESULTS Relative expression of β-catenin differed significantly among groups (P = .0002), it was significantly higher in patients with PMF and SMF than in the control group, but did not differ between patients with PMF and SMF. A negative correlation was found regarding hemoglobin level in PMF (P = .017). No association according to Janus kinase 2 (JAK2) V617F mutational status or JAK2 V617F allele burden was detected. CONCLUSION Our results show for the first time that β-catenin mRNA expression is increased in patients with PMF and SMF and its upregulation might potentiate anemia. A number of inflammatory cytokines associated with PMF are capable of mediating their effects through increased β-catenin expression. Accordingly, β-catenin can induce expression of a number of genes implicated in processes of cell cycle control, fibrosis, and angiogenesis, which are central to the PMF pathogenesis. Therefore, β-catenin might represent an interesting new therapeutic target in these diseases.
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Geduk A, Atesoglu EB, Tarkun P, Mehtap O, Hacihanefioglu A, Demirsoy ET, Baydemir C. The Role of β-Catenin in Bcr/Abl Negative Myeloproliferative Neoplasms: An Immunohistochemical Study. CLINICAL LYMPHOMA MYELOMA & LEUKEMIA 2015; 15:785-9. [PMID: 26422250 DOI: 10.1016/j.clml.2015.08.084] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2015] [Revised: 08/03/2015] [Accepted: 08/24/2015] [Indexed: 10/23/2022]
Abstract
INTRODUCTION β-Catenin is a multifunctional protein that acts as a central effector molecule in the Wnt signaling pathway. Aberrant activation of the Wnt/β-catenin signaling pathway causes various diseases including cancer. In this study we evaluated β-catenin expression in bcr/abl-negative myeloproliferative neoplasms (MPNs). MATERIALS AND METHODS The expression of β-catenin was evaluated in bone marrow using immunohistochemical methods in 66 patients with bcr/abl-negative myeloproliferative neoplasms (MPNs) and in 30 healthy control subjects. Immunreactive score (IRS; staining intensity × percentage of positive stained cells) was used for the evaluation of the cell staining reaction. RESULTS IRS of megakaryocytes (IRSmega) was higher in essential thrombocytemia (ET) compared with the control group (P = .022) and primary myelofibrosis (PMF; P = .001). IRS of vascular endothelial cells (IRSvas) was higher in the bcr/abl negative MPN compared with the control group (P = .024). Also, IRSvas was higher in the PMF compared with the control group (P = .001), policythemia vera (PV; P = .005), and ET (P = .006). A positive correlation was detected between IRSmega and platelet counts (P = .019). CONCLUSION Results of this study suggest that the Wnt/β-catenin signaling pathway has a role in the angiogenesis of PMF and in the thrombopoiesis of PV and ET. Hence, targeting the Wnt/β-catenin signaling pathway could open new avenues for novel therapeutic approaches in bcr/abl-negative MPNs.
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Affiliation(s)
- Ayfer Geduk
- Department of Hematology, Medical Faculty, Kocaeli University, Kocaeli, Turkey.
| | - Elif B Atesoglu
- Department of Hematology, Medical Faculty, Kocaeli University, Kocaeli, Turkey
| | - Pinar Tarkun
- Department of Hematology, Medical Faculty, Kocaeli University, Kocaeli, Turkey
| | - Ozgur Mehtap
- Department of Hematology, Medical Faculty, Kocaeli University, Kocaeli, Turkey
| | | | - Esra T Demirsoy
- Department of Hematology, Medical Faculty, Kocaeli University, Kocaeli, Turkey
| | - Canan Baydemir
- Department of Biostatistics and Medical Informatics, Medical Faculty, Kocaeli University, Kocaeli, Turkey
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Yao DD, Yang L, Wang Y, Liu C, Wei YJ, Jia XB, Yin W, Shu L. Geniposide promotes beta-cell regeneration and survival through regulating β-catenin/TCF7L2 pathway. Cell Death Dis 2015; 6:e1746. [PMID: 25950476 PMCID: PMC4669687 DOI: 10.1038/cddis.2015.107] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Revised: 03/17/2015] [Accepted: 03/18/2015] [Indexed: 01/09/2023]
Abstract
T-cell factor 7-like 2 (TCF7L2) is an important transcription factor of Wnt/β-catenin signaling, which has critical roles in β-cell survival and regeneration. In preliminary screening assay, we found geniposide, a naturally occurring compound, was able to increase TCF7L2 mRNA level in Min6 cells. Here we aimed to investigate the role of geniposide in β-cell and underlying mechanism involved. Geniposide was found to promote β-cell survival by increasing β-cell proliferation and decreasing β-cell apoptosis in cultured mouse islets after challenge with diabetic stimuli. Geniposide protected β-cell through activating Wnt signaling, enhanced expressions of TCF7L2 and GLP-1R, activated AKT, inhibited GSK3β activity, and promoted β-catenin nuclear translocation. The protective effect of geniposide was remarkably suppressed by siRNAs against β-catenin, or by ICG001 (β-catenin/TCF-mediated transcription inhibitor). Moreover, geniposide promoted β-cell regeneration in vivo to normalize blood glucose in high-fat diet and db/db mice. Increased β-cell proliferation was observed in pancreatic sections of geniposide-treated diabetic mice. Most importantly, geniposide triggered small islet-like cell clusters formation as a result of β-cell neogenesis from ductal epithelium, which was well correlated with the increase in TCF7L2 expression. In exocrine cells isolated from mouse pancreas, geniposide could induce duct cell differentiation through upregulating TCF7L2 expression and activating JAK2/STAT3 pathway. Taken together, we identified a novel role of geniposide in promoting β-cell survival and regeneration by mechanisms involving the activation of β-catenin/TCF7L2 signaling. Our finding highlights the potential value of geniposide as a possible treatment for type 2 diabetes.
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Affiliation(s)
- D D Yao
- Key Laboratory of New Drug Delivery System of Chinese Materia Medica, Jiangsu Province Academy of Chinese Medicine, Nanjing, China
| | - L Yang
- Key Laboratory of New Drug Delivery System of Chinese Materia Medica, Jiangsu Province Academy of Chinese Medicine, Nanjing, China
| | - Y Wang
- Jiangsu Key Laboratory of Xenotransplantation, Nanjing Medical University, Nanjing, China
| | - C Liu
- Department of Endocrinology, Jiangsu Province Hospital on Integration of Chinese and Western Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Y J Wei
- Key Laboratory of New Drug Delivery System of Chinese Materia Medica, Jiangsu Province Academy of Chinese Medicine, Nanjing, China
| | - X B Jia
- Key Laboratory of New Drug Delivery System of Chinese Materia Medica, Jiangsu Province Academy of Chinese Medicine, Nanjing, China
| | - W Yin
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, China
| | - L Shu
- Key Laboratory of New Drug Delivery System of Chinese Materia Medica, Jiangsu Province Academy of Chinese Medicine, Nanjing, China
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13
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Stepicheva N, Nigam PA, Siddam AD, Peng CF, Song JL. microRNAs regulate β-catenin of the Wnt signaling pathway in early sea urchin development. Dev Biol 2015; 402:127-41. [PMID: 25614238 DOI: 10.1016/j.ydbio.2015.01.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Revised: 12/18/2014] [Accepted: 01/09/2015] [Indexed: 12/19/2022]
Abstract
Development of complex multicellular organisms requires careful regulation at both transcriptional and post-transcriptional levels. Post-transcriptional gene regulation is in part mediated by a class of non-coding RNAs of 21-25 nucleotides in length known as microRNAs (miRNAs). β-catenin, regulated by the canonical Wnt signaling pathway, has a highly evolutionarily conserved function in patterning early metazoan embryos, in forming the Anterior-Posterior axis, and in establishing the endomesoderm. Using reporter constructs and site-directed mutagenesis, we identified at least three miRNA binding sites within the 3' untranslated region (3'UTR) of the sea urchin β-catenin. Further, blocking these three miRNA binding sites within the β-catenin 3'UTR to prevent regulation of endogenous β-catenin by miRNAs resulted in a minor increase in β-catenin protein accumulation that is sufficient to induce aberrant gut morphology and circumesophageal musculature. These phenotypes are likely the result of increased transcript levels of Wnt responsive endomesodermal regulatory genes. This study demonstrates the importance of miRNA regulation of β-catenin in early development.
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Affiliation(s)
- Nadezda Stepicheva
- Department of Biological Sciences, University of Delaware, 323 Wolf Hall, Newark, DE 19716, USA
| | - Priya A Nigam
- Department of Biological Sciences, University of Delaware, 323 Wolf Hall, Newark, DE 19716, USA
| | - Archana D Siddam
- Department of Biological Sciences, University of Delaware, 323 Wolf Hall, Newark, DE 19716, USA
| | - Chieh Fu Peng
- Department of Biology, University of Miami, Coral Gables, FL 33124, USA
| | - Jia L Song
- Department of Biological Sciences, University of Delaware, 323 Wolf Hall, Newark, DE 19716, USA.
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14
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Sadras T, Perugini M, Kok CH, Iarossi DG, Heatley SL, Brumatti G, Samuel MS, To LB, Lewis ID, Lopez AF, Ekert PG, Ramshaw HS, D'Andrea RJ. Interleukin-3-mediated regulation of β-catenin in myeloid transformation and acute myeloid leukemia. J Leukoc Biol 2014; 96:83-91. [PMID: 24598054 DOI: 10.1189/jlb.2ab1013-559r] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Aberrant activation of β-catenin is a common event in AML and is an independent predictor of poor prognosis. Although increased β-catenin signaling in AML has been associated with oncogenic translocation products and activating mutations in the FLT3R, the mechanisms that activate β-catenin in AML more broadly are still unclear. Here, we describe a novel link between IL-3 signaling and the regulation of β-catenin in myeloid transformation and AML. In a murine model of HoxB8 and IL-3 cooperation, we show that β-catenin protein levels are modulated by IL-3 and that Cre-induced deletion of β-catenin abolishes IL-3-dependent growth and colony formation. In IL-3-dependent leukemic TF-1.8 cells, we observed increased β-catenin protein levels and nuclear localization in response to IL-3, and this correlated with transcriptional induction of β-catenin target genes. Furthermore, IL-3 promoted β-catenin accumulation in a subset of AML patient samples, and gene-expression profiling of these cells revealed induction of WNT/β-catenin and TCF4 gene signatures in an IL-3-dependent manner. This study is the first to link β-catenin activation to IL-3 and suggests that targeting IL-3 signaling may be an effective approach for the inhibition of β-catenin activity in some patients with AML.
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Affiliation(s)
- Teresa Sadras
- Centre for Cancer Biology and School of Molecular and Biomedical Science and Centre for Stem Cell Research and Departments of Haematology and Department of Pharmacy and Medical Sciences, The University of South Australia, Adelaide, South Australia, Australia
| | - Michelle Perugini
- Centre for Cancer Biology and Departments of Haematology and School of Medicine, The University of Adelaide, Adelaide, South Australia, Australia
| | - Chung H Kok
- Centre for Cancer Biology and Departments of Haematology and School of Medicine, The University of Adelaide, Adelaide, South Australia, Australia
| | - Diana G Iarossi
- Centre for Cancer Biology and Departments of Haematology and Department of Pharmacy and Medical Sciences, The University of South Australia, Adelaide, South Australia, Australia
| | - Susan L Heatley
- Centre for Cancer Biology and Immunology, SA Pathology, Adelaide, South Australia, Australia
| | - Gabriela Brumatti
- Division of Cell Signalling and Cell Death, Walter and Eliza Hall Institute, Parkville, Victoria, Australia; and
| | - Michael S Samuel
- Centre for Cancer Biology and School of Molecular and Biomedical Science and Centre for Stem Cell Research and Immunology, SA Pathology, Adelaide, South Australia, Australia
| | - Luen B To
- Departments of Haematology and School of Medicine, The University of Adelaide, Adelaide, South Australia, Australia
| | - Ian D Lewis
- Centre for Cancer Biology and Departments of Haematology and School of Medicine, The University of Adelaide, Adelaide, South Australia, Australia
| | - Angel F Lopez
- Centre for Cancer Biology and School of Medicine, The University of Adelaide, Adelaide, South Australia, Australia; Immunology, SA Pathology, Adelaide, South Australia, Australia
| | - Paul G Ekert
- Division of Cell Signalling and Cell Death, Walter and Eliza Hall Institute, Parkville, Victoria, Australia; and
| | - Hayley S Ramshaw
- Centre for Cancer Biology and Immunology, SA Pathology, Adelaide, South Australia, Australia
| | - Richard J D'Andrea
- Centre for Cancer Biology and School of Molecular and Biomedical Science and Centre for Stem Cell Research and Departments of Haematology and Department of Pharmacy and Medical Sciences, The University of South Australia, Adelaide, South Australia, Australia School of Medicine, The University of Adelaide, Adelaide, South Australia, Australia;
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15
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Chuang KA, Lieu CH, Tsai WJ, Huang WH, Lee AR, Kuo YC. 3-Methoxyapigenin modulates β-catenin stability and inhibits Wnt/β-catenin signaling in Jurkat leukemic cells. Life Sci 2013; 92:677-86. [DOI: 10.1016/j.lfs.2012.12.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Revised: 11/02/2012] [Accepted: 12/22/2012] [Indexed: 10/27/2022]
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16
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Shu L, Zien K, Gutjahr G, Oberholzer J, Pattou F, Kerr-Conte J, Maedler K. TCF7L2 promotes beta cell regeneration in human and mouse pancreas. Diabetologia 2012; 55:3296-307. [PMID: 22945304 DOI: 10.1007/s00125-012-2693-z] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Accepted: 07/17/2012] [Indexed: 11/25/2022]
Abstract
AIMS/HYPOTHESIS Diabetes is characterised by loss and dysfunction of the beta cell. A major goal of diabetes therapy is to promote the formation of new beta cells. Polymorphisms of T cell factor 7-like 2 (TCF7L2) are associated with type 2 diabetes, negatively regulating beta cell survival and function. Here, we provide evidence for a role of TCF7L2 in beta cell proliferation and regeneration. METHODS Pancreatic sections from three mouse models (high-fat diet, exendin-4 and streptozotocin-treated mice) and from healthy individuals and patients with type 2 diabetes were used to investigate the association of beta cell regeneration and TCF7L2 levels. To analyse a direct effect of TCF7L2 on duct cell to beta cell conversion, TCF7L2 was overexpressed in isolated exocrine cells. RESULTS TCF7L2 levels correlated with beta cell compensation during high-fat diet feeding. TCF7L2 was increased together with pancreatic duct cell proliferation and differentiation. Small islet-like cell clusters (ICCs) that contained TCF7L2 originated in the vicinity of the ductal epithelium. In human isolated exocrine tissue, TCF7L2 overexpression induced proliferation of pancreatic duct cells and ICC formation next to duct cells, an effect dependent on the JAK2/STAT3 pathway. CONCLUSIONS/INTERPRETATION The present study demonstrates that TCF7L2 overexpression fosters beta cell regeneration. Our findings imply correlation of TCF7L2 levels and new beta cell formation.
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Affiliation(s)
- L Shu
- Centre for Biomolecular Interactions Bremen, University of Bremen, Leobener Strasse NW2, Bremen, Germany
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17
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Jamil K, Jayaraman A, Rao R, Raju S. In silico evidence of signaling pathways of notch mediated networks in leukemia. Comput Struct Biotechnol J 2012; 1:e201207005. [PMID: 24688641 PMCID: PMC3962152 DOI: 10.5936/csbj.201207005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Revised: 11/04/2012] [Accepted: 11/07/2012] [Indexed: 11/22/2022] Open
Abstract
Notch signaling plays a critical role in cell fate determination and maintenance of progenitors in many developmental systems. Notch receptors have been shown to be expressed on hematopoietic progenitor cells as well as to various degrees in peripheral blood T and B lymphocytes, monocytes, and neutrophils. Our aim was to understand the protein interaction network, using Notch1 protein name as query in STRING database and we generated a model to assess the significance of Notch1 associated proteins in Acute Lymphoblastic Leukemia (ALL). We further analyzed the expression levels of the genes encoding hub proteins, using Oncomine database, to determine their significance in leukemogenesis. Of the forty two hub genes, we observed that sixteen genes were underexpressed and eleven genes were overexpressed in T-cell Acute Lymphoblastic samples in comparison to their expression levels in normal cells. Of these, we found three novel genes which have not been reported earlier- KAT2B, PSEN1 (underexpressed) and CDH2 (overexpressed).These three identified genes may provide new insights into the abnormal hematopoietic process observed in Leukemia as these genes are involved in Notch signaling and cell adhesion processes. It is evident that experimental validation of the protein interactors in leukemic cells could help in the identification of new diagnostic markers for leukemia.
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Affiliation(s)
- Kaiser Jamil
- Centre for Biotechnology and Bioinformatics, School of Life sciences, Jawaharlal Nehru Institute of Advanced Studies (JNIAS), 6th Floor, Budha Bhawan, M.G. Road, Secunderabad 500003, Andhra Pradesh, India
| | - Archana Jayaraman
- Centre for Biotechnology and Bioinformatics, School of Life sciences, Jawaharlal Nehru Institute of Advanced Studies (JNIAS), 6th Floor, Budha Bhawan, M.G. Road, Secunderabad 500003, Andhra Pradesh, India
| | - Raghunatha Rao
- Oncology Department, Nizams Institute of Medical Sciences ( NIMS), Panjagutta, Hyderabad 500082, Andhra Pradesh, India
| | - Suryanarayana Raju
- Oncology Department, Nizams Institute of Medical Sciences ( NIMS), Panjagutta, Hyderabad 500082, Andhra Pradesh, India
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18
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Thaler R, Zwerina J, Rumpler M, Spitzer S, Gamsjaeger S, Paschalis EP, Klaushofer K, Varga F. Homocysteine induces serum amyloid A3 in osteoblasts via unlocking RGD-motifs in collagen. FASEB J 2012; 27:446-63. [PMID: 23085993 DOI: 10.1096/fj.12-208058] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Hyperhomocysteinemia is a risk factor for osteoporotic fractures. Homocysteine (Hcys) inhibits collagen cross-linking and consequently decreases bone extracellular matrix (ECM) quality. Serum amyloid A (A-SAA), an acute-phase protein family, plays an important role in chronic and inflammatory diseases and up-regulates MMP13, which plays an important role in bone development and remodeling. Here, we investigate the effect of Hcys on expression of SAA3, a member of the A-SAA gene family, in osteoblasts characterizing underlying mechanisms and possible consequences on bone metabolism. MC3T3-E1 osteoblast-like cells were cultured up to 21 d with Hcys (low millimolar range) or reseeded onto ECM resulting from untreated or Hcys-treated MC3T3-E1 cells. Fourier-transformed infrared spectroscopy and a discriminative antibody were used to characterize the resulting ECM. Gene expression and signaling pathways were analyzed by gene chip, quantitative RT-PCR, and immunoblotting. Transcriptional regulation of Saa3 was studied by promoter transfection assays, chromatin immunoprecipitation, and immunofluorescence microscopy. Hcys treatment resulted in reduced collagen cross-linking, uncovering of RGD-motifs, and activation of the PTK2-PXN-CTNNB1 pathway followed by RELA activation. These signaling events led to increased SAA3 expression followed by the production of MMP13 and several chemokines, including Ccl5, Ccl2, Cxcl10, and Il6. Our data suggest Saa3 as link between hyperhomocysteinemia and development of osteoporosis.
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Affiliation(s)
- Roman Thaler
- Ludwig Boltzmann Institute of Osteology at Hanusch Hospital of Wiener Gebietskrankenkasse and Allgemeine Unfallversicherungsanstalt Trauma Center Meidling, 1st Medical Department, Hanusch Hospital, Vienna, Austria
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19
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Fiskus W, Ganguly S, Kambhampati S, Bhalla KN. Role of additional novel therapies in myeloproliferative neoplasms. Hematol Oncol Clin North Am 2012; 26:959-80. [PMID: 23009932 DOI: 10.1016/j.hoc.2012.07.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The recent approval of ruxolitinib (INCB018424) for myelofibrosis and the preclinical/clinical development of several additional janus kinase (JAK)-targeted agents have ushered in an era of novel therapies for advanced myeloproliferative neoplasms (MPN), which are associated with constitutive activation of the JAK-signal transducer and activation of transcription (STAT) signaling pathway. Collectively, these novel therapeutic approaches could rapidly broaden the spectrum of available therapies, with potential for improved clinical outcome for patients with advanced MPN. This review covers the recent developments in the testing of novel therapeutic agents other than JAK inhibitors that target signaling pathways in addition to JAK/STAT, or target the deregulated epigenetic mechanisms in MPN.
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Affiliation(s)
- Warren Fiskus
- The University of Kansas Medical Center, 3901 Rainbow Boulevard, Robinson Hall 4030, Mail Stop 1027, Kansas City, KS 66160, USA
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20
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Majumder A, Kirabo A, Karrupiah K, Tsuda S, Caldwell-Busby J, Cardounel AJ, Keseru GM, Sayeski PP. Cell death induced by the Jak2 inhibitor, G6, correlates with cleavage of vimentin filaments. Biochemistry 2011; 50:7774-86. [PMID: 21823612 DOI: 10.1021/bi200847n] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Hyperkinetic Jak2 tyrosine kinase signaling has been implicated in several human diseases including leukemia, lymphoma, myeloma, and the myeloproliferative neoplasms. Using structure-based virtual screening, we previously identified a novel Jak2 inhibitor named G6. We showed that G6 specifically inhibits Jak2 kinase activity and suppresses Jak2-mediated cellular proliferation. To elucidate the molecular and biochemical mechanisms by which G6 inhibits Jak2-mediated cellular proliferation, we treated Jak2-V617F expressing human erythroleukemia (HEL) cells for 12 h with either vehicle control or 25 μM of the drug and compared protein expression profiles using two-dimensional gel electrophoresis. One differentially expressed protein identified by electrospray mass spectroscopy was the intermediate filament protein, vimentin. It was present in DMSO treated cells but absent in G6 treated cells. HEL cells treated with G6 showed both time- and dose-dependent cleavage of vimentin as well as a marked reorganization of vimentin intermediate filaments within intact cells. In a mouse model of Jak2-V617F mediated human erythroleukemia, G6 also decreased the levels of vimentin protein, in vivo. The G6-induced cleavage of vimentin was found to be Jak2-dependent and calpain-mediated. Furthermore, we found that intracellular calcium mobilization is essential and sufficient for the cleavage of vimentin. Finally, we show that the cleavage of vimentin intermediate filaments, per se, is sufficient to reduce HEL cell viability. Collectively, these results suggest that G6-induced inhibition of Jak2-mediated pathogenic cell growth is concomitant with the disruption of intracellular vimentin filaments. As such, this work describes a novel pathway for the targeting of Jak2-mediated pathological cell growth.
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Affiliation(s)
- Anurima Majumder
- Department of Physiology and Functional Genomics, University of Florida College of Medicine, Gainesville, Florida 32610, United States
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