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Wang M, Han X, Zha W, Wang X, Liu L, Li Z, Shi Y, Kan X, Wang G, Gao D, Zhang B. GDNF Promotes Astrocyte Abnormal Proliferation and Migration Through the GFRα1/RET/MAPK/pCREB/LOXL2 Signaling Axis. Mol Neurobiol 2022; 59:6321-6340. [PMID: 35925441 DOI: 10.1007/s12035-022-02978-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 07/26/2022] [Indexed: 10/16/2022]
Abstract
Glial cell-line derived neurotrophic factor (GDNF) is a powerful astroglioma (AG) proliferation and migration factor that is highly expressed in AG cells derived from astrocytes. However, it is still unclear whether high levels of GDNF promote AG occurrence or if they are secondary to AG formation. We previously reported that high concentrations of GDNF (200 and 500 ng/mL) can inhibit DNA damage-induced rat primary astrocytes (RA) apoptosis, suggesting that high concentrations of GDNF may be involved in the malignant transformation of astrocytes to AG cells. Here we show that 200 ng/mL GDNF significantly increased the proliferation and migration ability of RA cells and human primary astrocytes (HA). This treatment also induced RA cells to highly express Pgf, Itgb2, Ibsp, Loxl2, Lif, Cxcl10, Serpine1, and other genes that enhance AG proliferation and migration. LOXL2 is an important AG occurrence and development promotion factor and was highly expressed in AG tissues and cells. High concentrations of GDNF promote LOXL2 expression and secretion in RA cells through GDNF family receptor alpha-1(GFRα1)/rearranged during transfection proto-oncogene (RET)/mitogen-activated protein kinase (MAPK)/phosphorylated cyclic AMP response element binding protein (pCREB) signaling. GDNF-induced LOXL2 significantly promotes RA and HA cell proliferation and migration, and increases the expression of Ccl2, Gbp5, MMP11, TNN, and other genes that regulate the extracellular microenvironment in RA cells. Our results demonstrate that high concentrations of GDNF activate LOXL2 expression and secretion via the GFRα1/RET/MAPK/pCREB signal axis, which leads to remodeling of the astrocyte extracellular microenvironment through molecules such as Ccl2, Gbp5, MMP11, TNN. This ultimately results in abnormal astrocyte proliferation and migration. Collectively, these findings suggest that high GDNF concentrations may promote the malignant transformation of astrocytes to AG cells.
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Affiliation(s)
- Miaomiao Wang
- Department of Neurobiology and Anatomy, Xuzhou Key Laboratory of Neurobiology, Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China
| | - Xiao Han
- Department of Neurobiology and Anatomy, Xuzhou Key Laboratory of Neurobiology, Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China.,Nanjing Medical University, Nanjing, 211166, Jiangsu, China
| | - Wei Zha
- Department of Neurobiology and Anatomy, Xuzhou Key Laboratory of Neurobiology, Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China
| | - Xiaoyu Wang
- Department of Neurobiology and Anatomy, Xuzhou Key Laboratory of Neurobiology, Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China
| | - Liyun Liu
- Department of Neurobiology and Anatomy, Xuzhou Key Laboratory of Neurobiology, Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China
| | - Zimu Li
- Department of Neurobiology and Anatomy, Xuzhou Key Laboratory of Neurobiology, Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China
| | - Yefeng Shi
- Department of Neurobiology and Anatomy, Xuzhou Key Laboratory of Neurobiology, Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China
| | - Xugang Kan
- Department of Neurobiology and Anatomy, Xuzhou Key Laboratory of Neurobiology, Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China
| | - Gui Wang
- Department of Neurobiology and Anatomy, Xuzhou Key Laboratory of Neurobiology, Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China
| | - Dianshuai Gao
- Department of Neurobiology and Anatomy, Xuzhou Key Laboratory of Neurobiology, Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China.
| | - Baole Zhang
- Department of Neurobiology and Anatomy, Xuzhou Key Laboratory of Neurobiology, Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China.
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Guda MR, Tsung AJ, Asuthkar S, Velpula KK. Galectin-1 activates carbonic anhydrase IX and modulates glioma metabolism. Cell Death Dis 2022; 13:574. [PMID: 35773253 PMCID: PMC9247167 DOI: 10.1038/s41419-022-05024-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 06/10/2022] [Accepted: 06/14/2022] [Indexed: 01/21/2023]
Abstract
Galectins are a family of β-galactose-specific binding proteins residing within the cytosol or nucleus, with a highly conserved carbohydrate recognition domain across many species. Accumulating evidence shows that Galectin 1 (Gal-1) plays an essential role in cancer, and its expression correlates with tumor aggressiveness and progression. Our preliminary data showed Gal-1 promotes glioma stem cell (GSC) growth via increased Warburg effect. mRNA expression and clinical data were obtained from The Cancer Genome Atlas database. The immunoblot analysis conducted using our cohort of human glioblastoma patient specimens (hGBM), confirmed Gal-1 upregulation in GBM. GC/MS analysis to evaluate the effects of Gal-1 depletion showed elevated levels of α-ketoglutaric acid, and citric acid with a concomitant reduction in lactic acid levels. Using Biolog microplate-1 mitochondrial functional assay, we confirmed that the depletion of Gal-1 increases the expression levels of the enzymes from the TCA cycle, suggesting a reversal of the Warburg phenotype. Manipulation of Gal-1 using RNA interference showed reduced ATP, lactate levels, cell viability, colony-forming abilities, and increased expression levels of genes implicated in the induction of apoptosis. Gal-1 exerts its metabolic role via regulating the expression of carbonic anhydrase IX (CA-IX), a surrogate marker for hypoxia. CA-IX functions downstream to Gal-1, and co-immunoprecipitation experiments along with proximity ligation assays confirm that Gal-1 physically associates with CA-IX to regulate its expression. Further, silencing of Gal-1 in mice models showed reduced tumor burden and increased survival compared to the mice implanted with GSC controls. Further investigation of Gal-1 in GSC progression and metabolic reprogramming is warranted.
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Affiliation(s)
- Maheedhara R. Guda
- grid.430852.80000 0001 0741 4132Department of Cancer Biology and Pharmacology, University of Illinois College of Medicine at Peoria, Peoria, IL USA
| | - Andrew J. Tsung
- grid.430852.80000 0001 0741 4132Department of Cancer Biology and Pharmacology, University of Illinois College of Medicine at Peoria, Peoria, IL USA ,grid.430852.80000 0001 0741 4132Department of Neurosurgery, University of Illinois College of Medicine at Peoria, Peoria, IL USA ,Illinois Neurological Institute, Peoria, IL USA
| | - Swapna Asuthkar
- grid.430852.80000 0001 0741 4132Department of Cancer Biology and Pharmacology, University of Illinois College of Medicine at Peoria, Peoria, IL USA
| | - Kiran K. Velpula
- grid.430852.80000 0001 0741 4132Department of Cancer Biology and Pharmacology, University of Illinois College of Medicine at Peoria, Peoria, IL USA ,grid.430852.80000 0001 0741 4132Department of Neurosurgery, University of Illinois College of Medicine at Peoria, Peoria, IL USA ,grid.430852.80000 0001 0741 4132Department of Pediatrics, University of Illinois College of Medicine at Peoria, Peoria, IL USA
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Zhuang WZ, Lin YH, Su LJ, Wu MS, Jeng HY, Chang HC, Huang YH, Ling TY. Mesenchymal stem/stromal cell-based therapy: mechanism, systemic safety and biodistribution for precision clinical applications. J Biomed Sci 2021; 28:28. [PMID: 33849537 PMCID: PMC8043779 DOI: 10.1186/s12929-021-00725-7] [Citation(s) in RCA: 101] [Impact Index Per Article: 33.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Accepted: 04/07/2021] [Indexed: 12/13/2022] Open
Abstract
Mesenchymal stem/stromal cells (MSCs) are a promising resource for cell-based therapy because of their high immunomodulation ability, tropism towards inflamed and injured tissues, and their easy access and isolation. Currently, there are more than 1200 registered MSC clinical trials globally. However, a lack of standardized methods to characterize cell safety, efficacy, and biodistribution dramatically hinders the progress of MSC utility in clinical practice. In this review, we summarize the current state of MSC-based cell therapy, focusing on the systemic safety and biodistribution of MSCs. MSC-associated risks of tumor initiation and promotion and the underlying mechanisms of these risks are discussed. In addition, MSC biodistribution methodology and the pharmacokinetics and pharmacodynamics of cell therapies are addressed. Better understanding of the systemic safety and biodistribution of MSCs will facilitate future clinical applications of precision medicine using stem cells.
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Affiliation(s)
- Wei-Zhan Zhuang
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan.,Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan.,TMU Research Center of Cell Therapy and Regeneration Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan
| | - Yi-Heng Lin
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan.,Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University, Taipei, 10041, Taiwan.,Department of Obstetrics and Gynecology, National Taiwan University Hospital Yunlin Branch, Yunlin, 64041, Taiwan
| | - Long-Jyun Su
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 106, Taiwan
| | - Meng-Shiue Wu
- Department and Graduate Institute of Pharmacology, College of Medicine, National Taiwan University, Taipei, 10617, Taiwan
| | - Han-Yin Jeng
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan.,TMU Research Center of Cell Therapy and Regeneration Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan
| | - Huan-Cheng Chang
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 106, Taiwan.,Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, 106, Taiwan
| | - Yen-Hua Huang
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan. .,Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan. .,TMU Research Center of Cell Therapy and Regeneration Medicine, Taipei Medical University, 250 Wuxing Street, Taipei, 11031, Taiwan. .,International PhD Program for Cell Therapy and Regeneration Medicine, College of Medicine, Taipei Medical University, Taipei, 11031, Taiwan. .,Center for Reproductive Medicine, Taipei Medical University Hospital, Taipei Medical University, Taipei, 11031, Taiwan. .,Comprehensive Cancer Center of Taipei Medical University, Taipei, 11031, Taiwan. .,The PhD Program for Translational Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei, 11031, Taiwan.
| | - Thai-Yen Ling
- Department and Graduate Institute of Pharmacology, College of Medicine, National Taiwan University, Taipei, 10617, Taiwan. .,Research Center for Developmental Biology and Regenerative Medicine, National Taiwan University, Taipei, 100, Taiwan.
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Guda MR, Labak CM, Omar SI, Asuthkar S, Airala S, Tuszynski J, Tsung AJ, Velpula KK. GLUT1 and TUBB4 in Glioblastoma Could be Efficacious Targets. Cancers (Basel) 2019; 11:cancers11091308. [PMID: 31491891 PMCID: PMC6771132 DOI: 10.3390/cancers11091308] [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: 07/12/2019] [Revised: 08/15/2019] [Accepted: 08/27/2019] [Indexed: 01/07/2023] Open
Abstract
Glioblastoma multiforme (GBM) is the most aggressive and deadly brain tumor, portending a median 13-month survival even following gross total resection with adjuvant chemotherapy and radiotherapy. This prognosis necessitates improved therapies for the disease. A target of interest for novel chemotherapies is the Warburg Effect, which describes the tumor's shift away from oxidative phosphorylation towards glycolysis. Here, we elucidate GLUT1 (Glucose transporter 1) and one of its associated binding partners, TUBB4 (Tubulin 4), as potentially druggable targets in GBM. Using data mining approach, we demonstrate that GLUT1 is overexpressed as a function of tumor grade in astrocytoma's and that its overexpression is associated with poorer prognosis. Using both mass spectrometry performed on hGBM (human glioblastoma patient specimen) and in silico modeling, we show that GLUT1 interacts with TUBB4, and more accurately demonstrates GLUT1's binding with fasentin. Proximity ligation assay (PLA) and immunoprecipitation studies confirm GLUT1 interaction with TUBB4. Treatment of GSC33 and GSC28 cells with TUBB4 inhibitor, CR-42-24, reduces the expression of GLUT1 however, TUBB4 expression is unaltered upon fasentin treatment. Using human pluripotent stem cell antibody array, we demonstrate reduced levels of Oct3/4, Nanog, Sox2, Sox17, Snail and VEGFR2 (Vascular endothelial growth factor receptor 2) upon CR-42-24 treatment. Overall, our data confirm that silencing TUBB4 or GLUT1 reduce GSC tumorsphere formation, self-renewal and proliferation in vitro. These findings suggest GLUT1 and its binding partner TUBB4 as druggable targets that warrant further investigation in GBM.
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Affiliation(s)
- Maheedhara R Guda
- Department of Cancer Biology and Pharmacology, University of Illinois College of Medicine at Peoria, Peoria, IL 61605, USA
| | - Collin M Labak
- Department of Cancer Biology and Pharmacology, University of Illinois College of Medicine at Peoria, Peoria, IL 61605, USA
| | - Sara Ibrahim Omar
- Department of Oncology, University of Alberta, Edmonton, AB T6G 1Z2, Canada
| | - Swapna Asuthkar
- Department of Cancer Biology and Pharmacology, University of Illinois College of Medicine at Peoria, Peoria, IL 61605, USA
| | - Subra Airala
- Department of Health Professions, Rollins College, Winter Park, FL 32789, USA
| | - Jack Tuszynski
- Department of Oncology, University of Alberta, Edmonton, AB T6G 1Z2, Canada
| | - Andrew J Tsung
- Department of Cancer Biology and Pharmacology, University of Illinois College of Medicine at Peoria, Peoria, IL 61605, USA
- Department of Neurosurgery, University of Illinois College of Medicine at Peoria, Peoria, IL 61605, USA
- Illinois Neurological Institute, Peoria, IL 61605, USA
| | - Kiran K Velpula
- Department of Cancer Biology and Pharmacology, University of Illinois College of Medicine at Peoria, Peoria, IL 61605, USA.
- Department of Neurosurgery, University of Illinois College of Medicine at Peoria, Peoria, IL 61605, USA.
- Department of Pediatrics, University of Illinois College of Medicine at Peoria, Peoria, IL 61605, USA.
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5
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Wu W, Hu Z, Wang F, Gu H, Jiang X, Xu J, Zhan X, Zheng D, Zhang Z. Mxi1-0 regulates the growth of human umbilical vein endothelial cells through extracellular signal-regulated kinase 1/2 (ERK1/2) and interleukin-8 (IL-8)-dependent pathways. PLoS One 2017; 12:e0178831. [PMID: 28575053 PMCID: PMC5456372 DOI: 10.1371/journal.pone.0178831] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Accepted: 05/19/2017] [Indexed: 01/28/2023] Open
Abstract
Mxi1 plays an important role in the regulation of cell proliferation. Mxi1-0, a Mxi1 isoform, has a different N-terminal amino acid sequence, intracellular location and expression profile from Mxi1. However, the precise role of Mxi1-0 in cell proliferation and the molecular mechanism underlying its function remain poorly understood. Here, we showed that Mxi1-0 suppression decreased the proliferation of human umbilical vein endothelial cells (HUVECs) along with cell accumulation in the G2/M phase. Mxi1-0 suppression also significantly decreased the expression and secretion of interleukin (IL-8). Neutralizing IL-8 in conditioned medium (CM) from Mxi1-0-overexpressed HUVECs significantly eliminated CM-induced proliferation of HUVECs. In addition, Mxi1-0 suppression significantly decreased the activity of MAP kinase ERK1/2. Treatment of HUVECs with U0126, an ERK1/2 signaling inhibitor, attenuated autocrine production of IL-8 induced by Mxi1-0 overexpression. On the other hand, Mxi1-0 overexpression-induced IL-8 increased the level of phosphorylated ERK1/2 in HUVECs, and such increasing was diminished in cells incubated with CM, which neutralized with anti-IL-8 antibody. Taken together, our results suggest that Mxi1-0 regulates the growth of HUVECs via the IL-8 and ERK1/2 pathways, which apparently reciprocally activate each other.
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Affiliation(s)
- Weiling Wu
- Children’s Health Center, The Second Hospital, Nanjing Medical University, Nanjing, Jiangsu, P. R. China
| | - Zhenzhen Hu
- Clinical Molecular Diagnostic Laboratory, The Second Hospital, Nanjing Medical University, Nanjing, Jiangsu, P. R. China
| | - Feng Wang
- Children’s Health Center, The Second Hospital, Nanjing Medical University, Nanjing, Jiangsu, P. R. China
| | - Hao Gu
- The Second Clinical School, Nanjing Medical University, Nanjing, Jiangsu, P. R.China
| | - Xiuqin Jiang
- Clinical Molecular Diagnostic Laboratory, The Second Hospital, Nanjing Medical University, Nanjing, Jiangsu, P. R. China
| | - Jinjin Xu
- Clinical Molecular Diagnostic Laboratory, The Second Hospital, Nanjing Medical University, Nanjing, Jiangsu, P. R. China
| | - Xi Zhan
- Center for Vascular and inflammatory Diseases, University of Maryland School of Medicine, Baltimore, MD, United States of America
| | - Datong Zheng
- Children’s Health Center, The Second Hospital, Nanjing Medical University, Nanjing, Jiangsu, P. R. China
- Clinical Molecular Diagnostic Laboratory, The Second Hospital, Nanjing Medical University, Nanjing, Jiangsu, P. R. China
- The Second Clinical School, Nanjing Medical University, Nanjing, Jiangsu, P. R.China
- * E-mail:
| | - Zhengdong Zhang
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu, P. R.China
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Gallagher EJ, Alikhani N, Tobin-Hess A, Blank J, Buffin NJ, Zelenko Z, Tennagels N, Werner U, LeRoith D. Insulin receptor phosphorylation by endogenous insulin or the insulin analog AspB10 promotes mammary tumor growth independent of the IGF-I receptor. Diabetes 2013; 62:3553-60. [PMID: 23835331 PMCID: PMC3781483 DOI: 10.2337/db13-0249] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Endogenous hyperinsulinemia and insulin receptor (IR)/IGF-I receptor (IGF-IR) phosphorylation in tumors are associated with a worse prognosis in women with breast cancer. In vitro, insulin stimulation of the IR increases proliferation of breast cancer cells. However, in vivo studies demonstrating that IR activation increases tumor growth, independently of IGF-IR activation, are lacking. We hypothesized that endogenous hyperinsulinemia increases mammary tumor growth by directly activating the IR rather than the IGF-IR or hybrid receptors. We aimed to determine whether stimulating the IR with the insulin analog AspB10 could increase tumor growth independently of IGF-IR signaling. We induced orthotopic mammary tumors in control FVB/n and hyperinsulinemic MKR mice, and treated them with the insulin analog AspB10, recombinant human IGF-I, or vehicle. Tumors from mice with endogenous hyperinsulinemia were larger and had greater IR phosphorylation, but not IGF-IR phosphorylation, than those from control mice. Chronic AspB10 administration also increased tumor growth and IR (but not IGF-IR) phosphorylation in tumors. IGF-I led to activation of both the IGF-IR and IR and probably hybrid receptors. Our results demonstrate that IR phosphorylation increases tumor growth, independently of IGF-IR/hybrid receptor phosphorylation, and warrant consideration when developing therapeutics targeting the IGF-IR, but not the IR.
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Affiliation(s)
- Emily Jane Gallagher
- Division of Endocrinology, Diabetes and Bone Diseases, Samuel Bronfman Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Nyosha Alikhani
- Division of Endocrinology, Diabetes and Bone Diseases, Samuel Bronfman Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Aviva Tobin-Hess
- Division of Endocrinology, Diabetes and Bone Diseases, Samuel Bronfman Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Jeffrey Blank
- Division of Endocrinology, Diabetes and Bone Diseases, Samuel Bronfman Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Nicholas J. Buffin
- Division of Endocrinology, Diabetes and Bone Diseases, Samuel Bronfman Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Zara Zelenko
- Division of Endocrinology, Diabetes and Bone Diseases, Samuel Bronfman Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Norbert Tennagels
- R&D Diabetes Division, Sanofi-Aventis Deutschland, Frankfurt am Main, Germany
| | - Ulrich Werner
- R&D Diabetes Division, Sanofi-Aventis Deutschland, Frankfurt am Main, Germany
| | - Derek LeRoith
- Division of Endocrinology, Diabetes and Bone Diseases, Samuel Bronfman Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
- Corresponding author: Derek LeRoith,
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Radiation-induced hypomethylation triggers urokinase plasminogen activator transcription in meningioma cells. Neoplasia 2013; 15:192-203. [PMID: 23441133 DOI: 10.1593/neo.121334] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Revised: 12/06/2012] [Accepted: 12/10/2012] [Indexed: 12/27/2022] Open
Abstract
Our previous studies have shown the role of radiation-induced urokinase plasminogen activator (uPA) expression in the progression of meningioma. In the present study, we investigated whether modulation of DNA methylation profiles could regulate uPA expression. Initially, radiation treatment was found to induce hypomethylation in meningioma cells with a decrease in DNA (cytosine-5)-methyltransferase 1 (DNMT1) and methyl-CpG binding domain protein (MBD) expression. However, oxidative damage by H(2)O(2) or pretreatment of irradiated cells with N-acetyl cysteine (NAC) did not show any influence on these proteins, thereby indicating a radiation-specific change in the methylation patterns among meningioma cells. Further, we identified that hypomethylation is coupled to an increase in uPA expression in these cells. Azacytidine treatment induced a dose-dependent surge of uPA expression, whereas pre-treatment with sodium butyrate inhibited radiation-induced uPA expression, which complemented our prior results. Methylation-specific polymerase chain reaction on bisulfite-treated genomic DNA revealed a diminished methylation of uPA promoter in irradiated cells. Transfection with small hairpin RNA (shRNA)-expressing plasmids targeting CpG islands of the uPA promoter showed a marked decline in uPA expression with subsequent decrease in invasion and proliferation of meningioma cells. Further, radiation treatment was found to recruit SP1 transcription factor, which was abrogated by shRNA treatment. Analysis on signaling events demonstrated the activation of MAP kinase kinase (MEK)-extracellular signal-regulated kinase (ERK) in radiation-treated cells, while U0126 (MEK/ERK inhibitor) blocked hypomethylation, recruitment of SP1, and uPA expression. In agreement with our in vitro data, low DNMT1 levels and high uPA were found in intracranial tumors treated with radiation compared to untreated tumors. In conclusion, our data suggest that radiation-mediated hypomethylation triggers uPA expression in meningioma cells.
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Velpula KK, Rehman AA, Chelluboina B, Dasari VR, Gondi CS, Rao JS, Veeravalli KK. Glioma stem cell invasion through regulation of the interconnected ERK, integrin α6 and N-cadherin signaling pathway. Cell Signal 2012; 24:2076-84. [DOI: 10.1016/j.cellsig.2012.07.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Accepted: 07/03/2012] [Indexed: 01/26/2023]
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9
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EGFR and c-Met Cross Talk in Glioblastoma and Its Regulation by Human Cord Blood Stem Cells. Transl Oncol 2012; 5:379-92. [PMID: 23066446 DOI: 10.1593/tlo.12235] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Revised: 07/12/2012] [Accepted: 07/13/2012] [Indexed: 11/18/2022] Open
Abstract
Receptor tyrosine kinases (RTK) and their ligands control critical biologic processes, such as cell proliferation, migration, and differentiation. Aberrant expression of these receptor kinases in tumor cells alters multiple downstream signaling cascades that ultimately drive the malignant phenotype by enhancing tumor cell proliferation, invasion, metastasis, and angiogenesis. As observed in human glioblastoma (hGBM) and other cancers, this dysregulation of RTK networks correlates with poor patient survival. Epidermal growth factor receptor (EGFR) and c-Met, two well-known receptor kinases, are coexpressed in multiple cancers including hGBM, corroborating that their downstream signaling pathways enhance a malignant phenotype. The integration of c-Met and EGFR signaling in cancer cells indicates that treatment regimens designed to target both receptor pathways simultaneously could prove effective, though resistance to tyrosine kinase inhibitors continues to be a substantial obstacle. In the present study, we analyzed the antitumor efficacy of EGFR inhibitors erlotinib and gefitinib and c-Met inhibitor PHA-665752, along with their respective small hairpin RNAs (shRNAs) alone or in combination with human umbilical cord blood stem cells (hUCBSCs), in glioma cell lines and in animal xenograft models. We also measured the effect of dual inhibition of EGFR/c-Met pathways on invasion and wound healing. Combination treatments of hUCBSC with tyrosine kinase inhibitors significantly inhibited invasion and wound healing in U251 and 5310 cell lines, thereby indicating the role of hUCBSC in inhibition of RTK-driven cell behavior. Further, the EGFR and c-Met localization in glioma cells and hGBM clinical specimens indicated that a possible cross talk exists between EGFR and c-Met signaling pathway.
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10
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Velpula KK, Dasari VR, Tsung AJ, Dinh DH, Rao JS. Cord blood stem cells revert glioma stem cell EMT by down regulating transcriptional activation of Sox2 and Twist1. Oncotarget 2012; 2:1028-42. [PMID: 22184289 PMCID: PMC3282065 DOI: 10.18632/oncotarget.367] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The dynamic nature of cancer stem cells that underlie metastasis or their ability to switch between different cellular identities, as in EMT and MET, has profound implications for cancer therapy. The functional relationship between molecules involved in cancer cell stemness and metastasis is not clear. In this regard, our studies on hGBM tissue grade IV specimens showed significant expression of Twist1 and Sox2, known mesenchymal and stemness related markers, respectively, indicating their association with glial tumor genesis and metastasis. The glioma stem cells obtained from CD133+ cells demonstrated increased expression of Twist1 and Sox2 accompanied by significant increase in the mesenchymal markers such as N-cadherin, vimentin and β-catenin. Our studies on glioma stem cells treatment with human umbilical cord blood derived- mesenchymal stem cells, showed down regulation of Twist1 and Sox2 proteins, apart from other mesenchymal stem cell markers. Based on the in vitro experiments and in vivo intracranial xenograft mouse model studies, we elucidated the potential therapeutic role of hUCBSC in suppressing glioma cancer stemness by the induction of MET.
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Affiliation(s)
- Kiran Kumar Velpula
- Department of Cancer Biology and Pharmacology, University of Illinois College of Medicine at Peoria, Peoria, Illinois, USA
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