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Malik N, Kundu A, Gupta Y, Irshad K, Arora M, Goswami S, Mahajan S, Sarkar C, Suri V, Suri A, Chattopadhyay P, Sinha S, Chosdol K. Protumorigenic role of the atypical cadherin FAT1 by the suppression of PDCD10 via RelA/miR221-3p/222-3p axis in glioblastoma. Mol Carcinog 2023; 62:1817-1831. [PMID: 37606187 DOI: 10.1002/mc.23617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 07/18/2023] [Accepted: 07/28/2023] [Indexed: 08/23/2023]
Abstract
The atypical cadherin FAT1 function either as a pro or antitumorigenic in tumors of different tissue origins. Our group previously demonstrated the protumorigenic nature of FAT1 signaling in glioblastoma (GBM). In this study, we investigated how FAT1 influences the expression of clustered oncomiRs (miR-221-3p/miR-222-3p) and their downstream effects in GBM. Through several experiments involving the measurement of specific gene/microRNA expression, gene knockdowns, protein and cellular assays, we have demonstrated a novel oncogenic signaling pathway mediated by FAT1 in glioma. These results have been verified using antimiRs and miR-mimic assays. Initially, in glioma-derived cell lines (U87MG and LN229), we observed FAT1 as a novel up-regulator of the transcription factor NFκB-RelA. RelA then promotes the expression of the clustered-oncomiRs, miR-221-3p/miR-222-3p, which in turn suppresses the expression of the tumor suppressor gene (TSG), PDCD10 (Programmed cell death protein10). The suppression of PDCD10, and other known TSG targets (PTEN/PUMA), by miR-221-3p/miR-222-3p, leads to increased clonogenicity, migration, and invasion of glioma cells. Consistent with our in-vitro findings, we observed a positive expression correlation of FAT1 and miR-221-3p, and an inverse correlation of FAT1 and the miR-targets (PDCD10/PTEN/PUMA), in GBM tissue-samples. These findings were also supported by publicly available GBM databases (The Cancer Genome Atlas [TCGA] and The Repository of Molecular Brain Neoplasia Data [Rembrandt]). Patients with tumors displaying high levels of FAT1 and miR-221-3p expression (50% and 65% respectively) experienced shorter overall survival. Similar results were observed in the TCGA-GBM database. Thus, our findings show a novel FAT1/RelA/miR-221/miR-222 oncogenic-effector pathway that downregulates the TSG, PDCD10, in GBM, which could be targeted therapeutically in a specific manner.
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Affiliation(s)
- Nargis Malik
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Archismita Kundu
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Yakhlesh Gupta
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Khushboo Irshad
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Manvi Arora
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Sanjeev Goswami
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Swati Mahajan
- Neuropathology Laboratory, All India Institute of Medical Sciences, New Delhi, India
| | - Chitra Sarkar
- Neuropathology Laboratory, All India Institute of Medical Sciences, New Delhi, India
| | - Vaishali Suri
- Neuropathology Laboratory, All India Institute of Medical Sciences, New Delhi, India
| | - Ashish Suri
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, India
| | | | - Subrata Sinha
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Kunzang Chosdol
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
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Singh N, Mudassir M, Ansari S, Chosdol K, Sinha S, Chattopadhyay P. Poly(lactic-co-glycolic) acid nanoparticles localize in vesicles after diffusing into cells and are retained by intracellular traffic modulators. Nanomedicine (Lond) 2023; 18:1907-1919. [PMID: 38078434 DOI: 10.2217/nnm-2023-0139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2023] Open
Abstract
Aim: We investigated our previous finding of increased retention of poly(lactic-co-glycolic) acid nanoparticles (PLGA-NPs) with metabolic inhibitors (MI) and studied the effect of some small molecule inhibitors on PLGA-NP assimilation. Materials & methods: Intracellular PLGA-NP colocalization in the presence of MI was investigated by confocal microscopy. Intracellular retention of PLGA-NPs by some small molecules was estimated by fluorescence microscopy and flow cytometry after Pulse/Chase experiments. Results: MI caused PLGA-NP colocalization in intracellular membranous structures, mainly endosomes and lysosomes. Some small molecule inhibitors demonstrated increased intracellular PLGA-NP accumulation. Conclusion: This study elucidates the movement of PLGA-NP in cells and suggests that clinically used small molecules can reduce their extrusion by enhancing their stay within intracellular vesicles, with possible clinically beneficial consequences.
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Affiliation(s)
- Neha Singh
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Madeeha Mudassir
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India
- Department of Obstetrics and Gynaecology, University College of Medical Sciences, GTB Hospital, Delhi, 110095, India
| | - Shiba Ansari
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India
- Department of Biochemistry, University College of Medical Sciences, GTB Hospital, Delhi, 110095, India
| | - Kunzang Chosdol
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Subrata Sinha
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India
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Sharma V, Namdeo M, Kumar P, Kumar Mitra D, Chattopadhyay P, Sazawal S, Chaubey R, Saxena R, Kanga U, Seth T. Increased Expression of NOTCH-1 and T Helper Cell Transcription Factors in Patients with Acquired Aplastic Anemia. Iran Biomed J 2023; 27:357-65. [PMID: 37980558 PMCID: PMC10826914 DOI: 10.61186/ibj.3754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Accepted: 07/29/2022] [Indexed: 12/25/2023]
Abstract
Background Acquired aplastic anemia is an autoimmune disease in which auto-aggressive T cells destroy hematopoietic progenitors. T-cell differentiation is controlled by transcription factors that interact with NOTCH-1, which influences the respective T-cell lineages. Notch signaling also regulates the BM microenvironment. The present study aimed to assess the gene expressions of NOTCH-1 and T helper cell transcription factors in the acquired aplastic anemia patients. Methods Using quantitative real-time PCR, we studied the mRNA expression level for NOTCH-1, its ligands (DLL-1 and JAG-1), and T helper cell transcription factors (T-BET, GATA-3, and ROR-γt) in both PB and BM of aAA patients and healthy controls. Further, patients of aplastic anemia were stratified by their disease severity as per the standard criteria. Results The mRNA expression level of NOTCH-1, T-BET, GATA-3, and ROR-γT genes increased in aAA patients compared to healthy controls. There was no significant difference in the mRNA expression of Notch ligands between patients and controls. The mRNA expression level of the above-mentioned genes was found to be higher in SAA and VSAA than NSAA patients. In addition, NOTCH-1 and T helper cell-specific transcription factors enhanced in aAA. We also observed a significant correlation between the genes and hematological parameters in patients. Conclusion The interaction between NOTCH-1, T-BET, GATA-3, and ROR-γT might lead to the activation, proliferation, and polarization of T helper cells and subsequent BM destruction. The mRNA expression levels of genes varied with disease severity, which may contribute to pathogenesis of aAA.
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Affiliation(s)
- Vandana Sharma
- Department of Hematology, All India Institute of Medical Sciences, New Delhi, India
| | - Manju Namdeo
- Department of Transplant Immunology and Immunogenetics, All India Institute of Medical Sciences, New Delhi, India
| | - Prabin Kumar
- Department of Transplant Immunology and Immunogenetics, All India Institute of Medical Sciences, New Delhi, India
| | - Dipendra Kumar Mitra
- Department of Transplant Immunology and Immunogenetics, All India Institute of Medical Sciences, New Delhi, India
| | | | - Sudha Sazawal
- Department of Hematology, All India Institute of Medical Sciences, New Delhi, India
| | - Rekha Chaubey
- Department of Hematology, All India Institute of Medical Sciences, New Delhi, India
| | - Renu Saxena
- Department of Hematology, All India Institute of Medical Sciences, New Delhi, India
| | - Uma Kanga
- Department of Transplant Immunology and Immunogenetics, All India Institute of Medical Sciences, New Delhi, India
| | - Tulika Seth
- Department of Hematology, All India Institute of Medical Sciences, New Delhi, India
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Sharma G, Tran TM, Bansal I, Beg MS, Bhardwaj R, Bassi J, Tan Y, Jaiswal AK, Tso C, Jain A, Singh J, Chattopadhyay P, Singh A, Chopra A, Bakhshi S, Casero D, Rao DS, Palanichamy JK. RNA binding protein IGF2BP1 synergizes with ETV6-RUNX1 to drive oncogenic signaling in B-cell Acute Lymphoblastic Leukemia. J Exp Clin Cancer Res 2023; 42:231. [PMID: 37670323 PMCID: PMC10478443 DOI: 10.1186/s13046-023-02810-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 08/27/2023] [Indexed: 09/07/2023] Open
Abstract
BACKGROUND Acute lymphoblastic leukemia (ALL) is the most common pediatric hematological malignancy, with ETV6::RUNX1 being the most prevalent translocation whose exact pathogenesis remains unclear. IGF2BP1 (Insulin-like Growth Factor 2 Binding Protein 1) is an oncofetal RNA binding protein seen to be specifically overexpressed in ETV6::RUNX1 positive B-ALL. In this study, we have studied the mechanistic role of IGF2BP1 in leukemogenesis and its synergism with the ETV6::RUNX1 fusion protein. METHODS Gene expression was analyzed from patient bone marrow RNA using Real Time RT-qPCR. Knockout cell lines were created using CRISPR-Cas9 based lentiviral vectors. RNA-Seq and RNA Immunoprecipitation sequencing (RIP-Seq) after IGF2BP1 pulldown were performed using the Illumina platform. Mouse experiments were done by retroviral overexpression of donor HSCs followed by lethal irradiation of recipients using a bone marrow transplant model. RESULTS We observed specific overexpression of IGF2BP1 in ETV6::RUNX1 positive patients in an Indian cohort of pediatric ALL (n=167) with a positive correlation with prednisolone resistance. IGF2BP1 expression was essential for tumor cell survival in multiple ETV6::RUNX1 positive B-ALL cell lines. Integrated analysis of transcriptome sequencing after IGF2BP1 knockout and RIP-Seq after IGF2BP1 pulldown in Reh cell line revealed that IGF2BP1 targets encompass multiple pro-oncogenic signalling pathways including TNFα/NFκB and PI3K-Akt pathways. These pathways were also dysregulated in primary ETV6::RUNX1 positive B-ALL patient samples from our center as well as in public B-ALL patient datasets. IGF2BP1 showed binding and stabilization of the ETV6::RUNX1 fusion transcript itself. This positive feedback loop led to constitutive dysregulation of several oncogenic pathways. Enforced co-expression of ETV6::RUNX1 and IGF2BP1 in mouse bone marrow resulted in marrow hypercellularity which was characterized by multi-lineage progenitor expansion and strong Ki67 positivity. This pre-leukemic phenotype confirmed their synergism in-vivo. Clonal expansion of cells overexpressing both ETV6::RUNX1 and IGF2BP1 was clearly observed. These mice also developed splenomegaly indicating extramedullary hematopoiesis. CONCLUSION Our data suggest a combined impact of the ETV6::RUNX1 fusion protein and RNA binding protein, IGF2BP1 in activating multiple oncogenic pathways in B-ALL which makes IGF2BP1 and these pathways as attractive therapeutic targets and biomarkers.
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Affiliation(s)
- Gunjan Sharma
- Department of Biochemistry, All India Institute of Medical Sciences, Room 4008, Convergence Block, New Delhi, 110029, India
| | - Tiffany M Tran
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Ishu Bansal
- Department of Biochemistry, All India Institute of Medical Sciences, Room 4008, Convergence Block, New Delhi, 110029, India
| | - Mohammad Sabique Beg
- Department of Biochemistry, All India Institute of Medical Sciences, Room 4008, Convergence Block, New Delhi, 110029, India
| | - Ruchi Bhardwaj
- Department of Biochemistry, All India Institute of Medical Sciences, Room 4008, Convergence Block, New Delhi, 110029, India
| | - Jaspal Bassi
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Yuande Tan
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Amit Kumar Jaiswal
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Christine Tso
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Ayushi Jain
- Department of Biochemistry, All India Institute of Medical Sciences, Room 4008, Convergence Block, New Delhi, 110029, India
| | - Jay Singh
- Department of Laboratory Oncology, Dr B.R Ambedkar Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India
| | - Parthaprasad Chattopadhyay
- Department of Biochemistry, All India Institute of Medical Sciences, Room 4008, Convergence Block, New Delhi, 110029, India
| | - Archna Singh
- Department of Biochemistry, All India Institute of Medical Sciences, Room 4008, Convergence Block, New Delhi, 110029, India
| | - Anita Chopra
- Department of Laboratory Oncology, Dr B.R Ambedkar Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India
| | - Sameer Bakhshi
- Department of Medical Oncology, Dr B.R Ambedkar Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India
| | - David Casero
- F. Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Dinesh S Rao
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Jayanth Kumar Palanichamy
- Department of Biochemistry, All India Institute of Medical Sciences, Room 4008, Convergence Block, New Delhi, 110029, India.
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Ansari S, Mudassir M, Vijayalekshmi B, Chattopadhyay P. Targeting CXCR4-expressing Cancer Cells with Avidin-poly (lactic-co-glycolic acid) Nanoparticle Surface Modified with Biotinylated DV1 Peptide. Int J Appl Basic Med Res 2023; 13:106-112. [PMID: 37614837 PMCID: PMC10443452 DOI: 10.4103/ijabmr.ijabmr_58_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 04/27/2023] [Accepted: 06/09/2023] [Indexed: 08/25/2023] Open
Abstract
Background Chemokine receptor CXCR4 is frequently present in cells of various cancers. Hence, targeted therapy using CXCR4 ligands, such as DV1 peptide, on drug-loaded nanoparticles, has the potential to enhance the efficiency of cancer treatment. Aim The present study created a CXCR4-targeting drug delivery system using avidin-poly (lactic-co-glycolic acid) (PLGA) nanoparticle surface tagged with biotinylated DV1 peptide ligand. Materials and Methods A double-emulsion solvent evaporation technique was employed to prepare avidin-PLGA nanoparticles and characterized by transmission electron microscopy (TEM) and dynamic light scattering. Uptake was studied by confocal microscopy after incorporating fluorescein isothiocyanate (FITC)-labeled albumin inside the nanoparticles during their synthesis. Peptide-biotin-avidin-PLGA nanoparticles were tested in vitro on CXCR4-expressing U87MG cells. Photomicroscopy was done by a Nikon A1 Confocal Microscope, and pictures were analyzed by Nikon NIS-Elements BR software. Results Experimental results confirmed the specificity of DV1 peptide-tagged avidin-PLGA nanoparticles for cells expressing CXCR4 receptors. The avidin-PLGA nanoparticles were successfully synthesized and the same was confirmed by tagging them with FITC-labeled biotin. Conclusion Avidin-PLGA nanoparticle surface tagged with biotinylated DV1 peptide ligand has potential clinical application in the treatment of various cancers as targeted therapy for CXCR4-expressing cancer cells.
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Affiliation(s)
- Shiba Ansari
- Department of Biochemistry, University College of Medical Sciences, Delhi, India
| | - Madeeha Mudassir
- Department of Obstetrics and Gynecology, University College of Medical Sciences and Guru Tegh Bahadur Hospital, Delhi, India
| | - B. Vijayalekshmi
- Division of GI Sciences, Wellcome Trust Research Laboratory, Christian Medical College, Vellore, Tamil Nadu, India
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Gupta Y, Malik N, Goswami S, Arora M, Kundu A, Gupta S, Kapoor M, Suri V, Suri A, Chattopadhyay P, Sinha S, Chosdol K. 4P FAT1: A novel modulator of autophagy in human glioblastoma. ESMO Open 2023. [DOI: 10.1016/j.esmoop.2023.101016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023] Open
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Sharma V, Namdeo M, Kumar P, Mitra DK, Chattopadhyay P, Sazawal S, Chaubey R, Saxena R, Kanga U, Seth T. Increased Expression of NOTCH-1 and T Helper Cell Transcription Factors in Patients with Acquired Aplastic Anemia. Iran Biomed J 2022. [PMID: 37980558 DOI: 10.52547/ibj.3754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/20/2023]
Abstract
Background Acquired aplastic anemia is an autoimmune disease in which auto-aggressive T cells destroy hematopoietic progenitors. T-cell differentiation is controlled by transcription factors that interact with NOTCH-1, which influences the respective T-cell lineages. Notch signaling also regulates the BM microenvironment. The present study aimed to assess the gene expressions of NOTCH-1 and T helper cell transcription factors in the acquired aplastic anemia patients. Methods Using quantitative real-time PCR, we studied the mRNA expression level for NOTCH-1, its ligands (DLL-1 and JAG-1), and T helper cell transcription factors (T-BET, GATA-3, and ROR-γt) in both PB and BM of aAA patients and healthy controls. Further, patients of aplastic anemia were stratified by their disease severity as per the standard criteria. Results The mRNA expression level of NOTCH-1, T-BET, GATA-3, and ROR-γT genes increased in aAA patients compared to healthy controls. There was no significant difference in the mRNA expression of Notch ligands between patients and controls. The mRNA expression level of the above-mentioned genes was found to be higher in SAA and VSAA than NSAA patients. In addition, NOTCH-1 and T helper cell-specific transcription factors enhanced in aAA. We also observed a significant correlation between the genes and hematological parameters in patients. Conclusion The interaction between NOTCH-1, T-BET, GATA-3, and ROR-γT might lead to the activation, proliferation, and polarization of T helper cells and subsequent BM destruction. The mRNA expression levels of genes varied with disease severity, which may contribute to pathogenesis of aAA.
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Affiliation(s)
- Vandana Sharma
- Department of Hematology, All India Institute of Medical Sciences, New Delhi, India
| | - Manju Namdeo
- Department of Transplant Immunology and Immunogenetics, All India Institute of Medical Sciences, New Delhi, India
| | - Prabin Kumar
- Department of Transplant Immunology and Immunogenetics, All India Institute of Medical Sciences, New Delhi, India
| | - Dipendra Kumar Mitra
- Department of Transplant Immunology and Immunogenetics, All India Institute of Medical Sciences, New Delhi, India
| | | | - Sudha Sazawal
- Department of Hematology, All India Institute of Medical Sciences, New Delhi, India
| | - Rekha Chaubey
- Department of Hematology, All India Institute of Medical Sciences, New Delhi, India
| | - Renu Saxena
- Department of Hematology, All India Institute of Medical Sciences, New Delhi, India
| | - Uma Kanga
- Department of Transplant Immunology and Immunogenetics, All India Institute of Medical Sciences, New Delhi, India
| | - Tulika Seth
- Department of Hematology, All India Institute of Medical Sciences, New Delhi, India
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Irshad K, Srivastava C, Malik N, Arora M, Gupta Y, Goswami S, Sarkar C, Suri V, Mahajan S, Gupta DK, Suri A, Chattopadhyay P, Sinha S, Chosdol K. Upregulation of Atypical Cadherin FAT1 Promotes an Immunosuppressive Tumor Microenvironment via TGF-β. Front Immunol 2022; 13:813888. [PMID: 35720420 PMCID: PMC9205206 DOI: 10.3389/fimmu.2022.813888] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 04/11/2022] [Indexed: 12/15/2022] Open
Abstract
FAT atypical cadherin 1 (FAT1) promotes glioblastoma (GBM) by promoting protumorigenic inflammatory cytokine expression in tumor cells. However, tumors also have an immunosuppressive microenvironment maintained by mediators such as transforming growth factor (TGF)-β cytokines. Here, we have studied the role of FAT1 in tumor immune suppression. Our preliminary TIMER2.0 analysis of The Cancer Genome Atlas (TCGA) database revealed an inverse correlation of FAT1 expression with infiltration of tumor-inhibiting immune cells (such as monocytes and T cells) and a positive correlation with tumor-promoting immune cells [such as myeloid-derived suppressor cells (MDSCs)] in various cancers. We have analyzed the role of FAT1 in modulating the expression of TGF-β1/2 in resected human gliomas, primary glioma cultures, and other cancer cell lines (U87MG, HepG2, Panc-1, and HeLa). Positive correlations of gene expression of FAT1 and TGF-β1/2 were observed in various cancers in TCGA, Glioma Longitudinal Analysis Consortium (GLASS), and Chinese Glioma Genome Atlas (CGGA) databases. Positive expression correlations of FAT1 were also found with TGF-β1/2 and Serpine1 (downstream target) in fresh-frozen GBM samples using q-PCR. siRNA-mediated FAT1 knockdown in cancer cell lines and in primary cultures led to decreased TGF-β1/2 expression/secretion as assessed by q-PCR, Western blotting, and ELISA. There was increased chemotaxis (transmigration) of THP-1 monocytes toward siFAT1-transfected tumor cell supernatant as a consequence of decreased TGF-β1/2 secretion. Reduced TGF-β1 expression was also observed in THP-1 cultured in conditioned media from FAT1-depleted glioma cells, thus contributing to immune suppression. In U87MG cells, decreased TGF-β1 upon FAT1 knockdown was mediated by miR-663a, a known modulator. FAT1 expression was also observed to correlate positively with the expression of surrogate markers of MDSCs [programmed death ligand-1 (PD-L1), PD-L2, and interleukin (IL)-10] in glioma tumors, suggesting a potential role of FAT1 in MDSC-mediated immunosuppression. Hence, our findings elaborate contributions of FAT1 to immune evasion, where FAT1 enables an immunosuppressive microenvironment in GBM and other cancers via TGF-β1/2.
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Affiliation(s)
- Khushboo Irshad
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Chitrangda Srivastava
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Nargis Malik
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Manvi Arora
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Yakhlesh Gupta
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Sanjeev Goswami
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Chitra Sarkar
- Department of Pathology, All India Institute of Medical Sciences, New Delhi, India
| | - Vaishali Suri
- Department of Pathology, All India Institute of Medical Sciences, New Delhi, India
| | - Swati Mahajan
- Department of Pathology, All India Institute of Medical Sciences, New Delhi, India
| | - Deepak Kumar Gupta
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, India
| | - Ashish Suri
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, India
| | | | - Subrata Sinha
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Kunzang Chosdol
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
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Irshad K, Srivastava C, Malik N, Gupta Y, Suri V, Mahajan S, Gupta D, Suri A, Chattopadhyay P, Sinha S, Chosdol K. Abstract 3175: FAT1 and the immunosuppressive milieu in glioblastoma tumors. Cancer Res 2021. [DOI: 10.1158/1538-7445.am2021-3175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
INTRODUCTION: Glioblastoma tumors harbor an immunosuppressive microenvironment which is sustained by key players such as TGF-β1/2 and IL-10 cytokines; and mediators of the PD-1/PD-L1/2 pathway. Previously, our lab has shown the role of a new gene, FAT1, in promoting gliomagenesis by supporting the production of pro-inflammatory cytokines (IL-1β, IL-6, etc.) in glioma cells. Here, we show a potent role of FAT1 gene in regulation of anti-inflammatory genes in human glioma tumors, cell lines and primary cultures. Our findings indicate an additional way in which FAT1 might contribute to gliomagenesis. METHODS: q-PCR was used to analyse transcript levels of FAT1 and genes of the TGF-β1/2, IL-10 and PD-L1/2 pathways in fresh-frozen glioblastoma samples relative to normal brain RNA. Gene expression correlation was analysed using Spearman's test and semi-supervised clustering. TCGA expression data was extracted to analyse the correlation of FAT1 with anti-inflammatory genes. Primary tumor cultures and cell lines were transfected with FAT1-specific siRNA to check the effect on expression of anti-inflammatory cytokines, as well as effect on migratory properties of monocytes towards FAT1-knockdown tumor cells (supernatants). RESULTS: Significant positive correlation was found between upregulation of FAT1 and that of anti-inflammatory genes in fresh-frozen glioblastoma samples as well as TCGA datasets. Upon siRNA-mediated knockdown of FAT1 in in-vitro glioma cell cultures, we observed decreased anti-inflammatory genes' expression. We also found increased transmigration of monocytes towards the supernatants from siFAT1-transfected cells. CONCLUSION: FAT1 favors the immunosuppressive milieu in glioblastoma by supporting expression of anti-inflammatory genes. This is an emerging role of the new oncogene FAT1 and crucial to our understanding of the contributions of FAT1 to hallmarks of cancer.
FUNDING: SERB Start-Up Grant (DST, India); DHR Young Scientist Scheme (ICMR, India)
Citation Format: Khushboo Irshad, Chitrangda Srivastava, Nargis Malik, Yakhlesh Gupta, Vaishali Suri, Swati Mahajan, Deepak Gupta, Ashish Suri, Parthaprasad Chattopadhyay, Subrata Sinha, Kunzang Chosdol. FAT1 and the immunosuppressive milieu in glioblastoma tumors [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr 3175.
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Sharma G, Boby E, Nidhi T, Jain A, Singh J, Singh A, Chattopadhyay P, Bakhshi S, Chopra A, Palanichamy JK. Diagnostic Utility of IGF2BP1 and Its Targets as Potential Biomarkers in ETV6-RUNX1 Positive B-Cell Acute Lymphoblastic Leukemia. Front Oncol 2021; 11:588101. [PMID: 33708624 PMCID: PMC7940665 DOI: 10.3389/fonc.2021.588101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 01/08/2021] [Indexed: 01/22/2023] Open
Abstract
Around 85% of childhood Acute Lymphoblastic Leukemia (ALL) are of B-cell origin and characterized by the presence of different translocations including BCR-ABL1, ETV6-RUNX1, E2A-PBX1, and MLL fusion proteins. The current clinical investigations used to identify ETV6-RUNX1 translocation include FISH and fusion transcript specific PCR. In the current study we assessed the utility of IGF2BP1, an oncofetal RNA binding protein, that is over expressed specifically in ETV6-RUNX1 translocation positive B-ALL to be used as a diagnostic marker in the clinic. Further, public transcriptomic and Crosslinked Immunoprecipitation (CLIP) datasets were analyzed to identify the putative targets of IGF2BP1. We also studied the utility of using the mRNA expression of two such targets, MYC and EGFL7 as potential diagnostic markers separately or in conjunction with IGF2BP1. We observed that the expression of IGF2BP1 alone measured by RT-qPCR is highly sensitive and specific to be used as a potential biomarker for the presence of ETV6-RUNX1 translocation in future.
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Affiliation(s)
- Gunjan Sharma
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Elza Boby
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Thakur Nidhi
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Ayushi Jain
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Jay Singh
- Department of Laboratory Oncology, Dr. B.R. Ambedkar Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India
| | - Archna Singh
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | | | - Sameer Bakhshi
- Department of Medical Oncology, Dr. B.R. Ambedkar Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India
| | - Anita Chopra
- Department of Laboratory Oncology, Dr. B.R. Ambedkar Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India
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Baidya G, Tiwary R, Mudassir M, Singh N, Saha S, Chosdol K, Sinha S, Chattopadhyay P. Passive internalization and active extrusion determines PLGA-nanoparticle concentration in cancer cell lines. Nanomedicine (Lond) 2020; 15:2229-2239. [PMID: 32924855 DOI: 10.2217/nnm-2020-0229] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Background: Poly(lactic-co-glycolic) acid nanoparticle (PLGA-NP) trafficking across cell membranes was investigated to confirm preliminary results that contradicted existing studies. Materials & methods: Uptake and retention of PLGA-NPs at 37 and 4°C in the presence and absence of metabolic inhibitors in various cell lines was estimated. Results: Pulse experiments with metabolic inhibitors and culturing at 4°C demonstrated the predominantly passive nature of PLGA-NP uptake. Chase experiments with metabolic inhibitors indicated the role of active exocytosis in the extrusion of these NPs. PLGA-NPs with ionic or nonionic hydrophilic coats with highly positive or negative ζ-potential also showed similar results. Conclusion: Our study opens up the possibility of modulation of active exocytosis to increase intracellular retention of NPs for an extended period of drug delivery.
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Affiliation(s)
- Gaurav Baidya
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Rameshvar Tiwary
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Madeeha Mudassir
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Neha Singh
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Suman Saha
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Kunzang Chosdol
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Subrata Sinha
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India
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Parihar A, Tembhre M, Sharma V, Gupta S, Chattopadhyay P, Deepak K. Effect of narrowband ultraviolet B treatment on micro
RNA
expression in active nonsegmental generalized vitiligo. Br J Dermatol 2020; 183:167-169. [DOI: 10.1111/bjd.18890] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- A.S. Parihar
- Department of Dermatology and Venereology AIIMS New Delhi India
| | - M.K. Tembhre
- Department of Cardiac Biochemistry AIIMS New Delhi India
| | - V.K. Sharma
- Department of Dermatology and Venereology AIIMS New Delhi India
| | - S. Gupta
- Department of Dermatology and Venereology AIIMS New Delhi India
| | | | - K.K. Deepak
- Department of Physiology AIIMS New Delhi India
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Srivastava C, Irshad K, Gupta Y, Sarkar C, Suri A, Chattopadhyay P, Sinha S, Chosdol K. NFкB is a critical transcriptional regulator of atypical cadherin FAT1 in glioma. BMC Cancer 2020; 20:62. [PMID: 31992226 PMCID: PMC6988320 DOI: 10.1186/s12885-019-6435-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 12/05/2019] [Indexed: 01/15/2023] Open
Abstract
Background Overexpression of FAT1 gene and its oncogenic effects have been reported in several cancers. Previously, we have documented upregulation of FAT1 gene in glioblastoma (GBM) tumors which was found to increase the expression of proinflammatory markers, HIF-1α, stemness genes and EMT markers in glioma cells. Here, we reveal NFкB (RelA)/RelA/p65 as the transcriptional regulator of FAT1 gene in GBM cells. Methods In-silico analysis of FAT1 gene promoter was performed using online bioinformatics tool Promo alggen (Transfac 8.3) to identify putative transcription factor(s) binding motifs. A 4.0 kb FAT1 promoter (− 3220 bp to + 848 bp w.r.t. TSS + 1) was cloned into promoter less pGL3Basic reporter vector. Characterization of FAT1 promoter for transcriptional regulation was performed by in-vitro functional assays using promoter deletion constructs, site directed mutagenesis and ChIP in GBM cells. Results Expression levels of NFкB (RelA) and FAT1 were found to be increased and positively correlated in GBM tumors (n = 16), REMBRANDT GBM-database (n = 214) and TCGA GBM-database (n = 153). In addition to glioma, positive correlation between NFкB (RelA) and FAT1 expression was also observed in other tumors like pancreatic, hepatocellular, lung and stomach cancers (data extracted from TCGA tumor data). A 4.0 kb FAT1-promoter-construct [− 3220 bp/+ 848 bp, transcription start site (TSS) + 1, having 17 NFкB (RelA) motifs] showed high FAT1 promoter luciferase-activity in GBM cells (U87MG/A172/U373MG). FAT1 promoter deletion-construct pGL3F1 [− 200 bp/+ 848 bp, with 3-NFкB (RelA)-motifs] showed the highest promoter activity. Exposure of GBM cells to known NFкB (RelA)-activators [severe-hypoxia/TNF-α/ectopic-NFкB (RelA) + IKBK vectors] led to increased pGL3F1-promoter activity and increased endogenous-FAT1 expression. Conversely, siRNA-mediated NFкB (RelA) knockdown led to decreased pGL3F1-promoter activity and decreased endogenous-FAT1 expression. Deletion of NFкB (RelA)-motif at − 90 bp/− 80 bp [pGL3F1δ1-construct] showed significant decrease in promoter activity. Site directed mutagenesis at -90 bp/− 80 bp and ChIP assay for endogenous-NFкB (RelA) confirmed the importance of this motif in FAT1 expression regulation. Significant reduction in the migration, invasion as well as colony forming capacity of the U87MG glioma cells was observed on siRNA-mediated knockdown of NFкB (RelA). Conclusion Since FAT1 and NFкB (RelA) are independently known to promote pro-tumorigenic inflammation and upregulate the expression of HIF-1α/EMT/stemness in tumors, targeting the NFкB (RelA)-FAT1 axis may attenuate an important tumor-promoting pathway in GBM. This may also be applicable to other tumors.
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Affiliation(s)
- Chitrangda Srivastava
- Department of Biochemistry, All India Institute of Medical Sciences, -110029, New Delhi, India.,Present address: Cell Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Durham, NC, 27709, USA
| | - Khushboo Irshad
- Department of Biochemistry, All India Institute of Medical Sciences, -110029, New Delhi, India
| | - Yakhlesh Gupta
- Department of Biochemistry, All India Institute of Medical Sciences, -110029, New Delhi, India
| | - Chitra Sarkar
- Department of Pathology, All India Institute of Medical Sciences, New Delhi, India
| | - Ashish Suri
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, India
| | | | - Subrata Sinha
- Department of Biochemistry, All India Institute of Medical Sciences, -110029, New Delhi, India
| | - Kunzang Chosdol
- Department of Biochemistry, All India Institute of Medical Sciences, -110029, New Delhi, India.
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Weber J, Hodi S, Wind-Rotolo M, Woods D, Winter A, Chattopadhyay P, Laino A. Cell phenotypes associated with response and toxicity defined by high resolution flow cytometry in melanoma patients receiving checkpoint inhibition. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz255.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Kathpalia P, Nag TC, Chattopadhyay P, Sharma A, Bhat MA, Roy TS, Wadhwa S. In ovo Sound Stimulation Mediated Regulation of BDNF in the Auditory Cortex and Hippocampus of Neonatal Chicks. Neuroscience 2019; 408:293-307. [PMID: 31026564 DOI: 10.1016/j.neuroscience.2019.04.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 03/15/2019] [Accepted: 04/07/2019] [Indexed: 12/22/2022]
Abstract
Brain-derived neurotrophic factor (BDNF) is known to mediate activity-dependent changes in the developing auditory system. Its expression in the brainstem auditory nuclei, auditory cortex and hippocampus of neonatal chicks (Gallus gallus domesticus) in response to in ovo high intensity sound exposure at 110 dB (arrhythmic sound: recorded traffic noise, 30-3000 Hz with peak at 2700 Hz, rhythmic sound: sitar music, 100-4000 Hz) was examined to understand the previously reported altered volume and neuronal number in these regions. In the brainstem auditory nuclei, no mature BDNF, but proBDNF at the protein level was detected, and no change in its levels was observed after in ovo sound stimulation (music and noise). Increased ProBDNF protein levels were found in the auditory cortex in response to arrhythmic sound, along with decreased levels of one of the BDNF mRNA transcripts, in response to both rhythmic and arrhythmic sound stimulation. In the hippocampus, increased levels of mature BDNF were found in response to music. Expression microarray analysis was performed to understand changes in gene expression in the hippocampus in response to music and noise, followed by gene ontology analysis showing enrichment of probable signaling pathways. Differentially expressed genes like CAMK1 and STAT1 were found to be involved in downstream signaling on comparing music versus noise-exposed chicks. In conclusion, we report that BDNF is differentially regulated in the auditory cortex at the transcriptional and post-translational level, and in the hippocampus at the post-translational level in response to in ovo sound stimulation.
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Affiliation(s)
- Poorti Kathpalia
- Department of Anatomy, All India Institute of Medical Sciences, New Delhi, India
| | - Tapas Chandra Nag
- Department of Anatomy, All India Institute of Medical Sciences, New Delhi, India.
| | | | - Arundhati Sharma
- Department of Anatomy, All India Institute of Medical Sciences, New Delhi, India
| | - Muzaffer Ahmed Bhat
- Department of Physiology, All India Institute of Medical Sciences, New Delhi, India
| | - Tara Sankar Roy
- Department of Anatomy, All India Institute of Medical Sciences, New Delhi, India
| | - Shashi Wadhwa
- Department of Anatomy, All India Institute of Medical Sciences, New Delhi, India; Department of Anatomy, North Delhi Municipal Medical College, New Delhi, India
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Malik N, Chattopadhyay P, Sarkar C, Suri A, Sinha S, Chosdol K. CSIG-36. INVOLVEMENT OF microRNAs 221/222-3p IN THE REGULATION OF PROGRAMMED CELL DEATH 10 (PDCD10) GENE IN GLIOBLASTOMA. Neuro Oncol 2018. [DOI: 10.1093/neuonc/noy148.202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Nargis Malik
- All India Institute of Medical Sciences, Delhi, India
| | | | - Chitra Sarkar
- All India Institute of Medical Sciences, Delhi, India
| | - Ashish Suri
- All India Institute of Medical Sciences, Delhi, India
| | - Subrata Sinha
- All India Institute of Medical Sciences, Delhi, India
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Ansari S, Mudassir M, Vijayalekshmi B, Chattopadhyay P. CXCR4 antagonist mediated targeting of cancer cells using nanoparticles. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy430.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Malik N, Chattopadhyay P, Sarkar C, Suri A, Sinha S, Chosdol K. Emerging role of FAT1 gene in the regulation of oncogenic miRNA 221/222- 3p in glioma. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy314.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Bhagat M, Chattopadhyay P. PO-281 SIRT1 inhibition exhibits decreased pluripotency in glioma cancer stem cells. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Malik N, Chattopadhyay P, Sarkar C, Suri A, Sinha S, Chosdol K. PO-141 FAT1 acts as an oncogene and regulate the expression of miR-221/222–3 p in glioblastoma. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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21
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Mudassir M, Kassab M, Ansari S, Bhagat M, Chattopadhyay P. PO-002 Single siRNA mediated post transcriptional and transcriptional gene silencing of HPV18 oncogenes. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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22
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Irshad K, Srivastava C, Malik N, Sarkar C, Gupta D, Suri A, Chattopadhyay P, Sinha S, Chosdol K. CSIG-28. ASSOCIATION BETWEEN THE EXPRESSION OF FAT1 AND ANTI-INFLAMMATORY SIGNALING MOLECULES IN HUMAN GLIOMA. Neuro Oncol 2017. [DOI: 10.1093/neuonc/nox168.222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Boby E, Sharma G, Jain A, Mudassir M, Chattopadhyay P, Chopra A, Bakhshi S, Kumar J. Novel biomarker to diagnose ETV6-RUNX1 translocation in B-cell acute lymphoblastic leukemia. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx664.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Srivastava C, Irshad K, Dikshit B, Chattopadhyay P, Sarkar C, Gupta DK, Sinha S, Chosdol K. FAT1 modulates EMT and stemness genes expression in hypoxic glioblastoma. Int J Cancer 2017; 142:805-812. [PMID: 28994107 DOI: 10.1002/ijc.31092] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 09/19/2017] [Accepted: 09/25/2017] [Indexed: 01/07/2023]
Abstract
Glioblastoma (GBM) is characterized by the presence of hypoxia, stemness and local invasiveness. We have earlier demonstrated that FAT1 promotes invasiveness, inflammation and upregulates HIF-1α expression and its signaling in hypoxic GBM. Here, we have identified the role of FAT1 in regulating EMT (epithelial-mesenchymal transition) and stemness characteristics in GBM. The expression of FAT1, EMT (Snail/LOX/Vimentin/N-cad), stemness (SOX2/OCT4/Nestin/REST) and hypoxia markers (HIF-1α/VEGF/PGK1/CA9) was upregulated in ≥39% of GBM tumors (n = 31) with significant positive correlation (p ≤ 0.05) of the expression of FAT1 with LOX/Vimentin/SOX2/HIF-1α/PGK1/VEGF/CA9. Furthermore, positive correlation (p ≤ 0.01) of FAT1 with Vimentin/N-cad/SOX2/REST/HIF-1α has been observed in TCGA GBM-dataset (n = 430). Analysis of cells (U87MG/A172) exposed to severe hypoxia (0.2%O2 ) revealed elevated mRNA expression of FAT1, EMT (Snail/LOX/Vimentin/N-cad), stemness (SOX2/OCT4/Nestin/REST) and hypoxia markers (HIF-1α/PGK1/VEGF/CA9) as compared to their normoxic (20%O2 ) counterparts. FAT1 knockdown in U87MG/A172 maintained in severe hypoxia and in normoxic primary glioma cultures led to significant reduction of EMT/stemness markers as compared to controls. HIF-1α knockdown in U87MG cells markedly reduced the expression of all the EMT/stemness markers studied except for Nestin and SOX2 which were more under the influence of FAT1. This indicates FAT1 has a novel regulatory effect on EMT/stemness markers both via or independent of HIF-1α. The functional relevance of our study was corroborated by significant reduction in the number of soft-agar colonies formed in hypoxic-siFAT1 treated U87MG cells. Hence, our study for the first time reveals FAT1 as a novel regulator of EMT/stemness in hypoxic GBM and suggests FAT1 as a potential therapeutic candidate.
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Affiliation(s)
- Chitrangda Srivastava
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Khushboo Irshad
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Bhawana Dikshit
- College of Pharmacy, 543 Riffe Building, Ohio State University, Columbus, OH
| | | | - Chitra Sarkar
- Department of Pathology, All India Institute of Medical Sciences, New Delhi, India
| | - Deepak Kumar Gupta
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, India
| | - Subrata Sinha
- National Brain Research Centre, Manesar, Gurgaon, India
| | - Kunzang Chosdol
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
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Affiliation(s)
- V.K. Kashyap
- Centre of Excellence in Biological Sciences, Central Forensic Science Laboratory, 30 Gorachand Road, Kolkata 700 014, West Bengal, India
| | - T. Sitalaximi
- Centre of Excellence in Biological Sciences, Central Forensic Science Laboratory, 30 Gorachand Road, Kolkata 700 014, West Bengal, India
| | - P. Chattopadhyay
- Centre of Excellence in Biological Sciences, Central Forensic Science Laboratory, 30 Gorachand Road, Kolkata 700 014, West Bengal, India
| | - R. Trivedi
- Centre of Excellence in Biological Sciences, Central Forensic Science Laboratory, 30 Gorachand Road, Kolkata 700 014, West Bengal, India
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Chattopadhyay P, Kashyap V, Vasulu T. Gene Diversity at Three Tetrameric STR Loci Among Eight Ethnic Populations of West Bengal and Manipur, India. INT J HUM GENET 2017. [DOI: 10.1080/09723757.2001.11885768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- P. Chattopadhyay
- DNA Typing Unit, Central Forensic Science Laboratory, Kolkata, West Bengal, India
| | - V.K. Kashyap
- DNA Typing Unit, Central Forensic Science Laboratory, Kolkata, West Bengal, India
| | - T.S. Vasulu
- AHGU, Indian Statistical Institute, Kolkata, West Bengal, India
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Chattopadhyay P, Vasulu T, Kashyap V. Genetic Affinity Among Eight Ethnic Populations of West Bengal and Manipur, India: A Study Based on Six Polymorphic Functional Loci (HLADQA1, LDLR, GYPA, HBGG, D7S8 and GC). INT J HUM GENET 2017. [DOI: 10.1080/09723757.2002.11885811] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- P. Chattopadhyay
- DNA Typing Unit, Central Forensic Science Laboratory, Kolkata, West Bengal, India
| | - T.S. Vasulu
- AHGU, Indian Statistical Institute, Kolkata, West Bengal, India
| | - V.K. Kashyap
- DNA Typing Unit, Central Forensic Science Laboratory, Kolkata, West Bengal, India
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Srivastava C, Irshad K, Chattopadhyay P, Sarkar C, Suri A, Sinha S, Chosdol K. Abstract 3534: FAT1: A potential target of NFkB (RelA) in GBM. Cancer Res 2017. [DOI: 10.1158/1538-7445.am2017-3534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
FAT1 is a large transmembrane protein (502 kD), reportedly having dual role in different human cancers. Our lab has reported oncogenic role of FAT1 overexpression in glioblastoma multiforme (GBM, grade IV glioma) increasing migration-invasion as well as tumor inflammation and HIF1α activity. Morris et al. (2013), have reported that glioma patients with low FAT1-expressing tumors have significantly (p=0.037) longer survival (Rembrandt dataset), suggesting high FAT1 expression to have adverse effect on GBM patient survival. Since NFκB is a major transcription factor overexpressed in GBM and involve in regulating many oncognes at transcriptional level. There are no reports available on FAT1 upstream regulation. Therefore in this study we investigated the role of NFkB (RelA) in regulating FAT1 expression in GBM. In-silico analysis of FAT1 promoter predicted binding sites for several transcription factors including NFkB (RelA) having multiple binding motifs with high matrix score. We assessed the mRNA expression correlation of FAT1 and NFκB target gene (BCL2) in small cohort of GBM tumors (n=16). A significant positive correlation (0.647, p<0.01) was established between FAT1 and BCL2 in GBM tumors compared to normal brain (Clontech). In a sequential bioinformatics study, we analyzed TCGA GBM dataset and found significantly elevated expression of FAT1, RelA, IKBKB and RelA target genes (BCL2, MMP9 and Serpine) in GBM tumors (n=430) as compared to normal brain (n=10). In survival analysis of TCGA dataset {Grouped into high (n=100) and low FAT1 expression (n=100)}, low FAT1 expressing patients showed higher survival, corroborating the observation of Morris et al 2013. The role of NFkB (RelA) in FAT1 expression regulation was further analyzed in in-vitro in U87MG (GBM) cell line. We overexpressed and chemically inhibited NFkB using RelApBABE expression vector and PDTC respectively. There was increased FAT1expression in cells overexpressing NFkB and this effect could be reversed on NFkB inhibition, suggesting that RelA plays an important role in regulation of endogenous FAT1 expression. Furthermore, to confirm the regulatory role of NFκB (RelA) on FAT1 expression, 2-kb FAT1 promoter (pGLF2) and sequential 5’ deletion constructs (pGLF2A, pGLF2B, pGLF2C and pGLF2D) with different RelA binding sites were cloned into luciferase basic vector (pGL3B) and analyzed for their activity by in vitro luciferase assay. Among all constructs, 5’ deletion construct (pGLF2C) containing single consensus binding site for RelA and least no. of repressor sites, showed highest luciferase activity in U87MG. Furthermore, site directed mutagenesis of RelA consensus binding site decreased luciferase activities by three-fold as compared to the wild type construct, pGLF2C. The endogenous binding of RelA on FAT1 promoter was confirmed by ChIP (chromatin-immunoprecipitation) assay. Conclusively, our study for the first time identified NFkB (RelA) transcription factor as a potential regulator of FAT1.
Citation Format: Chitrangda Srivastava, Khushboo Irshad, Parthaprasad Chattopadhyay, Chitra Sarkar, Ashish Suri, Subrata Sinha, Kunzang Chosdol. FAT1: A potential target of NFkB (RelA) in GBM [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 3534. doi:10.1158/1538-7445.AM2017-3534
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Affiliation(s)
| | | | | | - Chitra Sarkar
- 1All India Institute of Medical Sciences, New Delhi, India
| | - Ashish Suri
- 1All India Institute of Medical Sciences, New Delhi, India
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Chosdol K, Srivastava C, Irshad K, Srinivas H, Gupta Y, Sarkar C, Suri A, Gupta DK, Chattopadhyay P, Sinha S. P01.05 Overexpression of FAT1 gene in GBM is regulated by transcription factor NFkB (RelA). Neuro Oncol 2017. [DOI: 10.1093/neuonc/nox036.081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Jha DK, Saikia K, Chakrabarti S, Bhattacharya K, Varadarajan KS, Patel AB, Goyary D, Chattopadhyay P, Deb P. Direct one-pot synthesis of glutathione capped hydrophilic FePt-CdS nanoprobe for efficient bimodal imaging application. Materials Science and Engineering: C 2017; 72:415-424. [DOI: 10.1016/j.msec.2016.11.077] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Revised: 11/10/2016] [Accepted: 11/17/2016] [Indexed: 01/12/2023]
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Bhagat M, Chattopadhyay P. Mena INV: A prospective bio-marker of cancer cells under hypoxia. Eur J Cancer 2017. [DOI: 10.1016/s0959-8049(17)30228-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Zakaria MK, Sarkar DP, Chattopadhyay P. Induction of Transcriptional Gene Silencing by Expression of shRNA Directed to c-Myc P2 Promoter in Hepatocellular Carcinoma by Tissue-Specific Virosomal Delivery. Methods Mol Biol 2017; 1543:245-257. [PMID: 28349432 DOI: 10.1007/978-1-4939-6716-2_14] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Double-stranded RNA-mediated transcriptional gene silencing (TGS) has shown promising results over posttranscriptional gene silencing (PTGS) due to its long term and heritable nature. Various research groups have shed light on different mechanisms by which TGS operate. Some of these include histone modification, DNA methylation, or restriction of RNA polymerase binding onto the target gene's promoter. This serves as an added advantage since permanent c-Myc inactivation is critical for suppressing hepatocellular carcinoma (HCC). Inability to target cancer cells specifically, without affecting the normal cells, has been one of the biggest drawbacks of an effective cancer therapy. Therefore, we aimed to overcome this barrier by first generating tumor-specific transcriptional units expressing TGS inducing shRNAs against c-Myc's P2 promoter only in neoplastic liver cells. Secondly, we coupled this TGS inducing system with Sendai fusion virosomes for liver-specific delivery to minimize nonspecific side effects in vitro.
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Affiliation(s)
- Mohammad Khalid Zakaria
- Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110029, India.
- International Centre for Genetic Engineering and Biotechnology, Padriciano 99, Trieste, 34149, Italy.
| | - Debi P Sarkar
- Department of Biochemistry, University of Delhi, South Campus, New Delhi, 110021, India
| | - Parthaprasad Chattopadhyay
- Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110029, India
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Datta S, Mitra S, Chattopadhyay P, Som T, Mukherjee S, Basu S. Spread and exchange of bla NDM-1 in hospitalized neonates: role of mobilizable genetic elements. Eur J Clin Microbiol Infect Dis 2016; 36:255-265. [PMID: 27796645 DOI: 10.1007/s10096-016-2794-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 09/16/2016] [Indexed: 11/28/2022]
Abstract
To investigate the mobilizable elements associated with bla NDM-1 in Enterobacteriaceae isolated from septicaemic neonates at a NICU in India, during December, 2008-2011. An attempt was also made to understand whether there was a pattern in the temporal acquisition of bla NDM-1 within the unit. Transferability of carbapenem resistance was tested by conjugation and transformation. Plasmid types and addiction systems were analysed. The genetic background of bla NDM-1 and association with class 1 integron were evaluated by PCR mapping. RFLP was carried out to discriminate plasmids of same incompatibility group. Transfer of carbapenem resistance was successful in 13/15 cases. bla NDM-1 was associated with different plasmid scaffolds (IncFII, IncL/M, IncN, IncR, IncHIB-M/FIB-M), IncF type being the prevalent one. Addiction systems ccdAB and hok/sok were associated with transferable plasmids. Genetic structures surrounding bla NDM-1 showed its association with at least a remnant of ISAba125 at its 5'-end. The spread of NDM-1 was not related to class 1 integron which possessed resistance determinants against trimethoprim (dfrA12, dfrA1, dfrA5), streptomycin (aadA2, aacA4), and rifampicin (arr-3). RFLP showed that three isolates possessed the same FII/FIIs plasmid; two of these three isolates were from a single neonate, implying interspecies transfer of bla NDM-1. The predominance of FII plasmids and ISAba125 along with bla NDM-1 was noted, but no specific pattern in the temporal acquisition of mobile genetic elements could be identified. To the best of our knowledge, this report is the first to inform the in-vivo interspecies plasmid transfer event of bla NDM-1 in a neonate.
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Affiliation(s)
- S Datta
- Division of Bacteriology, National Institute of Cholera and Enteric Diseases, P-33, C.I.T. Road, Scheme-XM, Kolkata, 700010, West Bengal, India
| | - S Mitra
- Division of Bacteriology, National Institute of Cholera and Enteric Diseases, P-33, C.I.T. Road, Scheme-XM, Kolkata, 700010, West Bengal, India
| | - P Chattopadhyay
- Department of Neonatology, Institute of Postgraduate Medical Education & Research, SSKM Hospital, 244 A. J. C. Bose Road, Kolkata, 700020, West Bengal, India
| | - T Som
- Department of Neonatology, Institute of Postgraduate Medical Education & Research, SSKM Hospital, 244 A. J. C. Bose Road, Kolkata, 700020, West Bengal, India
| | - S Mukherjee
- Department of Neonatology, Institute of Postgraduate Medical Education & Research, SSKM Hospital, 244 A. J. C. Bose Road, Kolkata, 700020, West Bengal, India
| | - S Basu
- Division of Bacteriology, National Institute of Cholera and Enteric Diseases, P-33, C.I.T. Road, Scheme-XM, Kolkata, 700010, West Bengal, India.
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Madan E, Dikshit B, Gowda SH, Srivastava C, Sarkar C, Chattopadhyay P, Sinha S, Chosdol K. FAT1 is a novel upstream regulator of HIF1α and invasion of high grade glioma. Int J Cancer 2016; 139:2570-82. [PMID: 27536856 PMCID: PMC6585695 DOI: 10.1002/ijc.30386] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 06/13/2016] [Accepted: 06/23/2016] [Indexed: 01/15/2023]
Abstract
The hypoxic microenvironment is an important contributor of glioblastoma (GBM) aggressiveness via HIF1α, while tumour inflammation is profoundly influenced by FAT Atypical Cadherin (FAT1). This study was designed to explore the functional interaction and significance of FAT1 and HIF1α under severe hypoxia‐mimicking tumour microenvironment in primary human tumours. We first identified a positive correlation of FAT1 with HIF1α and its target genes in GBM tumour specimens, revealing the significance of the FAT1‐HIF1α axis in glioma cells. We found that severe hypoxia leads to an increased expression of FAT1 and HIF1α in U87MG and U373MG cells. To reveal the relevance of FAT1 under hypoxic conditions, we depleted endogenous FAT1 under hypoxia and found a substantial reduction in the expression of HIF1α and its downstream target genes like CA9, GLUT1, VEGFA, MCT4, HK2, BNIP3 and REDD1, as well as a significant reduction in the invasiveness in GBM cells. At the molecular level, under hypoxia the FAT1 depletion‐associated reduction in HIF1α was due to compromised EGFR‐Akt signaling as well as increased VHL‐dependent proteasomal degradation of HIF1α. In brief, for the first time, these results reveal an upstream master regulatory role of FAT1 in the expression and role of HIF1α under hypoxic conditions and that FAT1‐HIF1α axis controls the invasiveness of GBM. Hence, FAT1 represents a novel potential therapeutic target for GBM. What's new? The hypoxic microenvironment is an important contributor of glioblastoma aggressiveness via HIF1α while tumor inflammation is profoundly influenced by FAT Atypical Cadherin (FAT1). This study explores the functional interaction of FAT1 and HIF1α in severe hypoxia‐mimicking tumor microenvironments. The results show that FAT1 upregulation is critical for enhancing and maintaining high HIFIα levels in tumors with severe hypoxia. FAT1 both increases HIFIα transcription and decreases HIFIα degradation in glioblastoma multiforme cell lines under hypoxic conditions. With FAT1 regulating the activity of HIF1α under hypoxic condition and the FAT1‐HIF1α axis controlling the invasiveness of glioblastoma, FAT1 represents a novel potential therapeutic target for glioblastomas.
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Affiliation(s)
- Evanka Madan
- Department of Biochemistry, AIIMS, New Delhi, India
| | | | | | | | | | | | - Subrata Sinha
- Department of Biochemistry, AIIMS, New Delhi, India. .,Director, National Brain Research Center, Manesar, Gurgaon, India.
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Sharma VK, Singh A, Srivastava SK, Kumar V, Gardi NL, Nalwa A, Dinda AK, Chattopadhyay P, Yadav S. Increased expression of platelet-derived growth factor associated protein-1 is associated with PDGF-B mediated glioma progression. Int J Biochem Cell Biol 2016; 78:194-205. [PMID: 27448842 DOI: 10.1016/j.biocel.2016.07.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Revised: 07/16/2016] [Accepted: 07/18/2016] [Indexed: 12/30/2022]
Abstract
The current treatment therapies available for malignant gliomas are inadequate. There is an urgent need to develop more effective therapies by characterizing the molecular pathogenesis of the disease. Over expression of platelet-derived growth factor (PDGF) ligands and receptors have been reported in malignant gliomas. Platelet-derived growth factor associated protein-1 (PDAP-1) is reported to modulate the mitogenic activity of PDGF ligands, but to date, there is no information concerning its role in PDGF-mediated glioma cell proliferation. This study aimed to characterize the role of PDAP-1 in PDGF-mediated glioma proliferation. The expression of PDAP-1 was observed to be significantly increased (p<0.05) in grade IV glioma tissue and cell lines compared to grade III. siRNA-mediated knockdown of PDAP-1 reduced the expression of PDGF-B and its downstream genes (Akt1/Protein kinase B (PKB) and phosphoinositide-dependent kinase-1 (PDK1) by up to 50%. In PDAP-1 knockdown glioma cells, more than a twofold reduction was also observed in the level of phosphorylated Akt. Interestingly, knockdown of PDAP-1 in combination with PDGF-B antibody inhibited glioma cell proliferation through activation of Caspase 3/7 and 9. We also demonstrate that PDAP-1 co-localizes with PDGF-B in the cytoplasm of glioma cells, and an interaction between both of the proteins was established. Collectively, these findings suggest that the expression of PDAP-1 is associated with disease malignancy, and its inhibition reduced the proliferation of malignant glioma cells through down-regulation of PDGF-B/Akt/PDK1 signaling. Thus, this study establishes PDAP-1 as an effecter of PDGF signaling in glioma cells and suggests that it could also be a promising therapeutic target.
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Affiliation(s)
- Vinay Kumar Sharma
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Anand Singh
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi 110029, India
| | | | - Vignesh Kumar
- Proteomics and Structural Biology Unit, Institute of genomics and Integrative Biology, New Delhi 110025, India
| | - Nilesh Laxman Gardi
- Advanced Centre for Treatment Research and Education in Cancer (ACTREC), Tata Memorial Centre, Mumbai, India
| | - Aasma Nalwa
- Department of Pathology, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Amit Kumar Dinda
- Department of Pathology, All India Institute of Medical Sciences, New Delhi 110029, India
| | | | - Savita Yadav
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110029, India.
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Kunjunni R, Sathianathan S, Behari M, Chattopadhyay P, Subbiah V. Silencing of Human CutC Gene (hCutC) Induces Apoptosis in HepG2 Cells. Biol Trace Elem Res 2016; 172:120-126. [PMID: 26660891 DOI: 10.1007/s12011-015-0577-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 11/25/2015] [Indexed: 11/30/2022]
Abstract
Copper is an essential microelement required for maintaining normal cell physiology. Copper transporter CutC is one of the six members of Cut family proteins, involved in prokaryotic copper homeostasis. Human homolog of CutC (hCutC) is an intracellular copper-binding protein with unknown physiological function. In the present study using HepG2 cells, we report the effects of hCutC knockdown on copper sensitivity and morphology of cells that ultimately leads to apoptosis. We silenced hCutC using specific small interfering RNA (siRNA), and its downregulation was confirmed by quantitative real-time PCR. Though there was no significant variation in total cellular copper as estimated by inductively coupled plasma-atomic emission spectrometry (ICP-AES), knockdown of hCutC caused an increase in sensitivity of HepG2 cells to copper loads when compared to control cells (studied by MTT-based cell viability assay). Morphological analysis by transmission electron microscopy (TEM) indicated onset of apoptosis in hCutC-silenced cells which was exacerbated upon copper treatment. Mitochondrial transmembrane potential (ΔΨm) assay and DNA fragmentation assay further ensured apoptosis occurring in cells upon hCutC silencing. The present study reveals copper induced damage in cells upon hCutC silencing and provides evidence for the role of hCutC protein in intracellular copper homeostasis.
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Affiliation(s)
- Remesh Kunjunni
- Department of Neurobiochemistry, India Institute of Medical Sciences, New Delhi, -110029, India
| | - Sandeep Sathianathan
- Department of Neurobiochemistry, India Institute of Medical Sciences, New Delhi, -110029, India
| | - Madhuri Behari
- Department of Neurology, India Institute of Medical Sciences, New Delhi, -110029, India
| | | | - Vivekanandhan Subbiah
- Department of Neurobiochemistry, India Institute of Medical Sciences, New Delhi, -110029, India.
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Bhagat M, Palanichamy JK, Ramalingam P, Mudassir M, Irshad K, Chosdol K, Sarkar C, Seth P, Goswami S, Sinha S, Chattopadhyay P. HIF-2α mediates a marked increase in migration and stemness characteristics in a subset of glioma cells under hypoxia by activating an Oct-4/Sox-2-Mena (INV) axis. Int J Biochem Cell Biol 2016; 74:60-71. [DOI: 10.1016/j.biocel.2016.02.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 01/25/2016] [Accepted: 02/22/2016] [Indexed: 12/14/2022]
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Ghosh K, Chatterjee A, Ghosh S, Chakraborty S, Chattopadhyay P, Bhattacharya A, Pal M. Validation of Leiden Score in Predicting Progression of Rheumatoid Arthritis in Undifferentiated Arthritis in Indian Population. Ann Med Health Sci Res 2016; 6:205-210. [PMID: 28480094 PMCID: PMC5405631 DOI: 10.4103/amhsr.amhsr_339_15] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Background: Leiden Score, is a very useful tool for predicting future development of rheumatoid arthritis (RA), among undifferentiated arthritis (UA) patients. This score has been validated in various western studies but rarely among south east Asian patients. Aims: To validate the Leiden early arthritis prediction rule in an Indian cohort of patients for predicting rheumatoid arthritis (RA) in undifferentiated arthritis (UA) patients and to formulate any simpler version of prediction score taking only clinical variables of original Leiden prediction rule. Subjects and Methods: In a group comparative longitudinal study model, 58 patients with early symmetrical polyarthritis were enrolled and baseline evaluation was done according to Leiden prediction rule and then 3 monthly. After 1 year, Leiden prediction score and chance of evolving into RA were calculated. Patients were divided into two groups: Those who developed RA and who did not. They were selected on random sampling process. Tender joint count (TJC), duration of morning stiffness, and duration of arthritis were selected as clinical variables for linear discriminant analysis with disease outcome being the dependent variable. Discriminant scores (D) for each patient was calculated. A receiver operating characteristic (ROC) curve was constructed with the discriminant score and compared with Leiden prediction score. Results: About 54% (27/50) of patients were diagnosed with RA and 46% (23/50) developed other rheumatologic condition or viral inflammatory arthritis or remained undifferentiated or attained complete remission. None of the patients with UA, who scored the regression coefficients 4 or less progressed to RA, and those who scored 7 or more, almost certainly progressed to RA. Unstandardized canonical discriminant coefficients for TJC (T), duration of morning stiffness (M), and duration of arthritis (A) were calculated. ROC curve was plotted with the formula: D = 0.164 × T + 0.066 × M + 0.012 × A − 2.838. Area under curve (AUC) at 95% confidence interval for our discriminant function was 0.845 (standard error [SE] 0.054). In comparison, AUC of Leiden prediction score was 0.897 (SE 0.043). Conclusions: Leiden prediction rule is highly applicable to UA patients to predict progression of RA in Indian patients and larger multi-center study with larger cohorts is needed to validate the formulation we derived to predict RA.
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Affiliation(s)
- K Ghosh
- Department of Medicines, Murshidabad Medical College, Murshidabad, West Bengal, India
| | - A Chatterjee
- Department of Neurology, Nilratan Sircar Medical College, Kolkata, West Bengal, India
| | - S Ghosh
- Department of Anesthesiology, Murshidabad Medical College, Murshidabad, West Bengal, India
| | - S Chakraborty
- Department of Medicine, College of Medicine and Sagore Dutta Hospital, Kolkata, West Bengal, India
| | - P Chattopadhyay
- Department of Medicine, College of Medicine and Sagore Dutta Hospital, Kolkata, West Bengal, India
| | - A Bhattacharya
- Department of Medicine, Nightingale Hospital, Kolkata, West Bengal, India
| | - M Pal
- Department of Biochemistry, Burdwan Medical College, Burdwan, West Bengal, India
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Yadav S, Sharma V, Singh A, Srivastava S, Kumar V, Nalwa A, Dinda A, Chattopadhyay P. Platelet-derived growth factor associated protein-1: A plausible function in Gliomas. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv514.36] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Khan I, Zakaria MK, Kumar M, Mani P, Chattopadhyay P, Sarkar DP, Sinha S. Erratum to: A novel placental like alkaline phosphatase promoter driven transcriptional silencing combined with single chain variable fragment antibody based virosomal delivery for neoplastic cell targeting. J Transl Med 2015; 13:300. [PMID: 26370128 PMCID: PMC4570628 DOI: 10.1186/s12967-015-0643-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Imran Khan
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India.
| | - Mohammad Khalid Zakaria
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India. .,National Brain Research Centre, Manesar, Gurgaon, Haryana, 122051, India.
| | - Mukesh Kumar
- National Brain Research Centre, Manesar, Gurgaon, Haryana, 122051, India.
| | - Prashant Mani
- Department of Biochemistry, University of Delhi, South Campus, Benito Juarez Road, New Delhi, 110021, India.
| | | | - Debi P Sarkar
- Department of Biochemistry, University of Delhi, South Campus, Benito Juarez Road, New Delhi, 110021, India.
| | - Subrata Sinha
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India. .,National Brain Research Centre, Manesar, Gurgaon, Haryana, 122051, India.
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Srivastava C, Irshad K, Chattopadhyay P, Sarkar C, Gupta D, Sinha S, Chosdol K. 2907 A positive correlation between Snail and SOX2 expression in hypoxic GBM. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)31623-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Khan I, Zakaria MK, Kumar M, Mani P, Chattopadhyay P, Sarkar DP, Sinha S. A novel placental like alkaline phosphatase promoter driven transcriptional silencing combined with single chain variable fragment antibody based virosomal delivery for neoplastic cell targeting [corrected]. J Transl Med 2015; 13:254. [PMID: 26242403 PMCID: PMC4524171 DOI: 10.1186/s12967-015-0602-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 07/10/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Placental like alkaline phosphatase (PLAP), an oncofetal antigen, is highly expressed in germ cell, cervical, ovarian and several other tumour types but minimally in normal tissues [corrected]. The expression of a PLAP promoter based transcriptional unit following antigen mediated cell specific delivery is a possible approach for tumour targeting. METHODS PLAP promoter alone or in combination with NFκB DNA response elements was used for expressing shRNA targeting the long control region (LCR) of human papillomavirus (HPV)-16 oncogenes E6 and E7 via transcriptional gene silencing in PLAP expressing cervical cancer cell lines, SiHa and CaSki. This was packaged in a Sendai virus envelope incorporating a single chain variable fragment antibody (scFv) for antibody mediated targeting. Specificity and efficacy of the shRNA was assessed by studying the heterochromatization, down regulation of the HPV-16 E6/E7 genes and subsequent effects on their targets and cell growth properties. RESULTS Reduction of HPV-16 E6 and E7 expression by TGS led to the activation of the previously suppressed target genes of p53 (PUMA and NOXA) and Rb (cyclins A2 and E). Cell death was seen only in PLAP expressing HPV-16 infected SiHa and CaSki cells but not in the HPV-18 integrated HeLa and non-PLAP CHO cells. There was reduction in the enhancer associated transcripts of the long control region (LCR) of HPV-16 E6/E7 genes. Also, an increase in the enrichment of dimethylated histone three lysine nine (H3K9Me2) and trimethylated histone three lysine twenty-seven (H3K27Me3) was observed by ChIP assay, which decreased upon trichostatin A treatment, indicating a possible mechanism for the heterochromatization of the target LCR region. CONCLUSION A combination of novel PLAP promoter and antibody based specificities has the potential for being developed as a possible therapeutic strategy for PLAP positive neoplasia.
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Affiliation(s)
- Imran Khan
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India.
| | - Mohammad Khalid Zakaria
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India. .,National Brain Research Centre, Manesar, Gurgaon, Haryana, 122051, India.
| | - Mukesh Kumar
- National Brain Research Centre, Manesar, Gurgaon, Haryana, 122051, India.
| | - Prashant Mani
- Department of Biochemistry, University of Delhi, South Campus, Benito Juarez Road, New Delhi, 110021, India.
| | | | - Debi P Sarkar
- Department of Biochemistry, University of Delhi, South Campus, Benito Juarez Road, New Delhi, 110021, India.
| | - Subrata Sinha
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India. .,National Brain Research Centre, Manesar, Gurgaon, Haryana, 122051, India.
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Kassab MA, Mudassir M, Singh A, N M, Bhagat M, Palanichamy JK, Ramalingam P, Chosdol K, Sinha S, Chattopadhyay P. Gene Silencing and Activation of Human Papillomavirus 18 Is Modulated by Sense Promoter Associated RNA in Bidirectionally Transcribed Long Control Region. PLoS One 2015; 10:e0128416. [PMID: 26047143 PMCID: PMC4457724 DOI: 10.1371/journal.pone.0128416] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 04/27/2015] [Indexed: 12/02/2022] Open
Abstract
Background Recently various studies have demonstrated the role of promoter associated non-coding RNAs (pRNA) in dsRNA induced transcriptional gene silencing and activation. However the exact mechanistic details of these processes with respect to the orientation of pRNAs are poorly defined. Methodology/Principal Findings We have identified novel sense and antisense long control region (LCR) associated RNAs (pRNAs) in HPV18 positive cervical cancer cell lines HeLa, C-4 I and C-4 II. Using dsRNAs against these pRNAs, we were able to achieve upregulation or downregulation of the sense and antisense pRNAs and the downstream E6 and E7 oncogenes. We present evidence that knockdown of the sense pRNA is associated with reduction in E6 and E7 oncogenes and an upregulation of antisense pRNA. Conversely upregulation of sense pRNA is accompanied by an induction of the oncogenes and a concomitant reduction in antisense pRNA. Moreover, the exact role of sense and antisense pRNAs in dsRNA mediated gene modulation was confirmed by their selective degradation using antisense phosphorothioate oligodeoxynucleotides (ODN). Degradation of sense pRNA with antisense ODN led to loss of dsRNA induced silencing and activation, suggesting that dsRNA mediated gene modulation requires sense pRNA. Both processes were accompanied with congruent changes in the methylation pattern of activating and repressive histones. Conclusion/Significance Thus this data identifies and demonstrates the role of previously unknown important regulatory transcripts in HPV18 gene expression which can prove valuable targets in cervical cancer therapeutics. This mode of gene regulation by bidirectional transcription could be operational in other promoters as well and serve as a mechanism of regulating gene expression.
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Affiliation(s)
- Muzaffer Ahmad Kassab
- Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India
| | - Madeeha Mudassir
- Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India
| | - Anand Singh
- Department of Pathology & Laboratory Medicine, David Geffen School of Medicine at University of California Los Angeles, Los Angeles, CA, United States of America
| | - Muthuraman N
- Department of Biochemistry, Institute of Liver and Biliary Sciences, New Delhi, Vasant Kunj, India
| | - Mohita Bhagat
- Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India
| | | | - Pradeep Ramalingam
- Weill Cornell Medical College, York Avenue, New York, NY, United States of America
| | - Kunzang Chosdol
- Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India
| | - Subrata Sinha
- National Brain Research Center, Manesar, Gurgaon, Haryana, India
| | - Parthaprasad Chattopadhyay
- Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India
- * E-mail:
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Kar R, Palanichamy JK, Banerjee A, Chattopadhyay P, Jain SK, Singh N. Survivin siRNA increases sensitivity of primary cultures of ovarian cancer cells to paclitaxel. Clin Transl Oncol 2015; 17:737-42. [PMID: 26033427 DOI: 10.1007/s12094-015-1302-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 05/13/2015] [Indexed: 01/19/2023]
Abstract
PURPOSE This aim of this study was to use ovarian cancer cells shed in ascitic fluid to establish primary cultures and subsequently use it to detect drug resistance to paclitaxel. Survivin siRNA was used to down regulate survivin expression and effect on paclitaxel resistance was also evaluated. METHODOLOGY Ascitic fluid along with corresponding primary tumor tissue was collected from twenty untreated epithelial ovarian cancer patients. Ten primary cultures were established from ascites obtained from untreated ovarian cancer patients in MCDB 105 and M199 medium (ratio 1:1). Knockdown of survivin was done using siRNA and sensitivity to paclitaxel was evaluated by MTT assay. RESULTS Grape-like clusters of ovarian cancer cells present in ascites attached and gave a characteristic cobble stone appearance. Treatment with survivin siRNA resulted in a fivefold decrease in survivin expression in primary cultures. Survivin siRNA treatment significantly increased the sensitivity of the primary ovarian cancer cell cultures to paclitaxel. CONCLUSION Ascitic cancer cells reflect the molecular profile of tumor and can be used to diagnose resistance to chemotherapy. This study also establishes that high survivin expression is also responsible for resistance to paclitaxel.
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Affiliation(s)
- R Kar
- Department of Biochemistry, University College of Medical Sciences, Room No. 234, New Delhi, Delhi, 110095, India,
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Kumar M, Mani P, Pratheesh P, Chandra S, Jeyakkodi M, Chattopadhyay P, Sarkar D, Sinha S. Membrane Fusion Mediated Targeted Cytosolic Drug Delivery Through scFv Engineered Sendai Viral Envelopes. Curr Mol Med 2015; 15:386-400. [DOI: 10.2174/1566524015666150505155949] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Revised: 03/30/2015] [Accepted: 04/28/2015] [Indexed: 11/22/2022]
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Zakaria MK, Khan I, Mani P, Chattopadhyay P, Sarkar DP, Sinha S. Hepatocellular Carcinoma Specific Transcriptional Interference of c‐Myc promoter by alpha‐fetoprotein and Sendai Virosome Based dsRNA System. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.lb115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mohammad Khalid Zakaria
- NeuroresearchNational Brain Research CentreManesarHaryanaIndia
- BiochemistryAll India Institute of Medical SciencesNew DelhiDelhiIndia
| | - Imran Khan
- BiochemistryAll India Institute of Medical SciencesNew DelhiDelhiIndia
| | - Prashant Mani
- BiochemistryUniversity of Delhi South CampusNew DelhiDelhiIndia
| | | | - Debi P. Sarkar
- BiochemistryUniversity of Delhi South CampusNew DelhiDelhiIndia
| | - Subrata Sinha
- NeuroresearchNational Brain Research CentreManesarHaryanaIndia
- BiochemistryAll India Institute of Medical SciencesNew DelhiDelhiIndia
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Irshad K, Mohapatra SK, Srivastava C, Garg H, Mishra S, Dikshit B, Sarkar C, Gupta D, Chandra PS, Chattopadhyay P, Sinha S, Chosdol K. A combined gene signature of hypoxia and notch pathway in human glioblastoma and its prognostic relevance. PLoS One 2015; 10:e0118201. [PMID: 25734817 PMCID: PMC4348203 DOI: 10.1371/journal.pone.0118201] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 01/08/2015] [Indexed: 11/18/2022] Open
Abstract
Hypoxia is a hallmark of solid tumors including glioblastoma (GBM). Its synergism with Notch signaling promotes progression in different cancers. However, Notch signaling exhibits pleiotropic roles and the existing literature lacks a comprehensive understanding of its perturbations under hypoxia in GBM with respect to all components of the pathway. We identified the key molecular cluster(s) characteristic of the Notch pathway response in hypoxic GBM tumors and gliomaspheres. Expression of Notch and hypoxia genes was evaluated in primary human GBM tissues by q-PCR. Clustering and statistical analyses were applied to identify the combination of hypoxia markers correlated with upregulated Notch pathway components. We found well-segregated tumor—clusters representing high and low HIF-1α/PGK1-expressors which accounted for differential expression of Notch signaling genes. In combination, a five-hypoxia marker set (HIF-1α/PGK1/VEGF/CA9/OPN) was determined as the best predictor for induction of Notch1/Dll1/Hes1/Hes6/Hey1/Hey2. Similar Notch-axis genes were activated in gliomaspheres, but not monolayer cultures, under moderate/severe hypoxia (2%/0.2% O2). Preliminary evidence suggested inverse correlation between patient survival and increased expression of constituents of the hypoxia-Notch gene signature. Together, our findings delineated the Notch-axis maximally associated with hypoxia in resected GBM, which might be prognostically relevant. Its upregulation in hypoxia-exposed gliomaspheres signify them as a better in-vitro model for studying hypoxia-Notch interactions than monolayer cultures.
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Affiliation(s)
- Khushboo Irshad
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | | | - Chitrangda Srivastava
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Harshit Garg
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Seema Mishra
- Department of Biochemistry, School of Life Science, University of Hyderabad, Hyderabad, India
| | - Bhawana Dikshit
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Chitra Sarkar
- Department of Pathology, All India Institute of Medical Sciences, New Delhi, India
| | - Deepak Gupta
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, India
| | | | | | - Subrata Sinha
- National Brain Research Centre, Manesar, Gurgaon, Haryana, India
- * E-mail: (KC); (SS)
| | - Kunzang Chosdol
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
- * E-mail: (KC); (SS)
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Tembhre MK, Parihar AS, Sharma VK, Sharma A, Chattopadhyay P, Gupta S. Alteration in regulatory T cells and programmed cell death 1-expressing regulatory T cells in active generalized vitiligo and their clinical correlation. Br J Dermatol 2015; 172:940-50. [PMID: 25376752 DOI: 10.1111/bjd.13511] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/28/2014] [Indexed: 12/21/2022]
Abstract
BACKGROUND Vitiligo is an autoimmune depigmentation disease, and defects in regulatory T cells (Tregs) have been proposed in the pathogenesis of generalized vitiligo (GV). However, the role of programmed cell death (PD)1(+) Tregs has not been studied. OBJECTIVES To investigate the status of Tregs, PD1(+) Tregs and associated parameters in active GV (aGV) during the first episode of disease attack and to establish the clinical correlation. METHODS The percentages of circulating Tregs, PD1(+) Tregs and CD3(+) CD4(+) PD1(+) T cells were evaluated in 50 patients with aGV and 51 controls. Expression levels of FOXP3, TGFB1, CTLA4 and genes for chemokine receptors (CCR4, CCR7) and their ligands (CCL21, CCL22) were quantified in peripheral blood and in lesional, perilesional, nonlesional and normal skin sections. The corresponding proteins were immunolocalized in tissue of aGV. RESULTS The percentage of Tregs was decreased (P = 0·001) and that of PD1(+) Tregs increased (P = 0·001) in peripheral blood of patients with aGV compared with controls. The abundance of TGFB1 and CCL21 mRNA was significantly decreased in the peripheral blood of patients with aGV. Significant differences in forkhead box P3, transforming growth factor-β and CCL21 protein expression were found in skin sections. CONCLUSIONS Deficiency in Treg frequency and decreased expression of Treg-associated parameters (TGFB and CCL21) suggested a possible defect in Tregs that may alter their suppression function and skin homing in aGV. The increased PD1(+) Tregs suggests that the PD1/PD ligand pathway may be involved in aGV and may have a role in Treg exhaustion. Further study is required to delineate the effect of PD1 in regulating Treg function in aGV.
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Affiliation(s)
- M K Tembhre
- Department of Dermatology and Venereology, All India Institute of Medical Sciences (AIIMS), Ansari Nagar, 110029, New Delhi, India
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Bhagat M, Sinha S, Chattopadhyay P. Abstract 428: HIC-1: A gene silenced in cancer stem cells of glioma. Cancer Res 2014. [DOI: 10.1158/1538-7445.am2014-428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background : According to the cancer stem cell hypothesis, tumors contain and are driven by a minority cellular population which has retained or re-established key stem-cell properties. Studies have demonstrated frequent hypermethylation of the HIC-1 locus in human cancers and recent work has demonstrated hypermethylation of HIC-1 in ES cells. Targeted methylation of HIC-1 has been shown to transform mesenchymal stem cells into cancer stem/initiating cells. However, so far no study has established the epigenetic role/status of HIC-1 in cancer stem cells.
Methods and Results: U87MG, a glioblastoma cell line, showed a consistent decrease of HIC-1 expression in gliomaspheres obtained in Stem cell media compared to same tumor cells grown in normal media. To examine for the role of HIC-1 in regulating stemness (Sox-2, Oct-4, Nanog), we established a U87 cell line with dominant negative p53 (dn-U87) expressing low HIC-1 levels. Increase in expression of stemness markers was observed in dn-U87 compared to wt-U87.Moreover,effect of hypoxia in increasing stemness was more pronounced in the dn-U87 cell line.
Knockdown of HIC-1 in U87MG grown in normal or stem cell media exhibited an increase in expression of stemness markers (Sox2, Oct4, Nanog and Nestin) under both conditions compared to Mock and control, further confirming role of HIC-1 in modulating stemness expression . Also, gliomaspheres were obtained much earlier (i.e. on Day 4) in HIC-1 knockdown samples grown in stem cell media compared to both Mock and Control (Day7).
To look for the difference in epigenetic signature of HIC-1 gene between gliomaspheres and tumor cells, we checked for changes in methylation and chromatin accessibility in the two cell populations. MNAse assay ascertained heterochromatization of the HIC-1 promoter in gliomaspheres compared to normal U87 cells, while bisulfite sequencing or High Resolution Melt PCR could not detect any change in methylation pattern of the HIC-1 promoter in the two cell populations studied.
Interpretation and Conclusion: Down-regulation of HIC-1, by i) epigenetic changes or ii) knockdown by siRNA or iii) using mutant p53 cell line, may be responsible for contributing to stem cell-like properties to tumor cells. Since HIC-1 is a tumor suppressor gene silenced in many cancers as a result of promoter hypermethylation, it could by itself be a new target for epigenetic therapy. Moreover, increase in stemness on knockdown of HIC-1 could provide new insights into the behavior of cancer-initiating stem cells.
Citation Format: Mohita Bhagat, Subrata Sinha, Parthaprasad Chattopadhyay. HIC-1: A gene silenced in cancer stem cells of glioma. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 428. doi:10.1158/1538-7445.AM2014-428
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Affiliation(s)
- Mohita Bhagat
- 1All India Institute Of Medical Sciences, Delhi, India
| | - Subrata Sinha
- 2National Brain Research Centre, Manesar, Gurgaon, India
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srivastava C, Irshad K, Sahu A, Chattopadhyay P, Sarkar C, Gupta DK, Sinha S, Chosdol K. Abstract 2077: Snail modulates stemness properties in hypoxic Glioblastoma. Cancer Res 2014. [DOI: 10.1158/1538-7445.am2014-2077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Introduction: Glioblastoma (GBM) is the most aggressive form of glioma characterized by hypoxic regions with surrounding areas of necrosis. Hypoxia is responsible for inducing cancer invasiveness via epithelial-mesenchymal transition (EMT), thereby promoting tumor aggressiveness and therapeutic resistance. HIF-1α is known to upregulate Snail in various cancers. Snail over expression correlates with cancer stem cell-like properties in cancers. The association of EMT and stemness properties plays a vital role in tumors progression and might helps in therapeutic targeting. We have, therefore, investigated the correlation of EMT and Stem cell markers in hypoxic GBM.
Method: mRNA expression of 5 EMT, 3 stemness and 5 hypoxia markers were analyzed in the 31 GBM samples and U373MG glioma cell line maintained under normoxia (20% O2) and severe hypoxia (0.2% O2) conditions for 24, 48 and 72 hrs. Correlation and cluster analysis were applied using SPSS 11.5, Cluster 3.0 software etc and R-software.
Result: In tumors, spearman correlation was found to be significant (p≤0.05) between EMT markers and Hypoxia markers. Of all EMT markers, Snail correlated significantly with the maximum hypoxia markers, including HIF-1α. In addition, Snail was significantly correlated with Stem cell markers SOX2 (p<0.01) and Nestin (p<0.05). Gene Cluster analysis in 31 GBM arranged in decreasing order of Snail expression showed significant upregulation of SOX2 and Nestin in the high Snail expressing tertile. This correlation of gene expression in tumors was validated by in-vitro expression analysis of the molecules in U373MG cells, where we assessed significant increase in the expression of hypoxia markers (HIF-1α, VEGF and CA9), EMT (Snail and LOX) and SC markers (SOX2 and OCT4) were significantly increased under severe hypoxic conditions.
Interpretation & conclusions: Our finding for the first time suggests the role of Snail in provoking stemness of cancer cells in hypoxic GBM, thereby promoting aggressiveness of GBM.
Note: This abstract was not presented at the meeting.
Citation Format: Chitrangda srivastava, Khushboo Irshad, Arpit Sahu, Parthaprasad Chattopadhyay, Chitra Sarkar, Deepak kumar Gupta, Subrata Sinha, Kunzang Chosdol. Snail modulates stemness properties in hypoxic Glioblastoma. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 2077. doi:10.1158/1538-7445.AM2014-2077
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Affiliation(s)
| | | | - Arpit Sahu
- 1All India Institute of Medical Sciences, New Delhi, India
| | | | - Chitra Sarkar
- 1All India Institute of Medical Sciences, New Delhi, India
| | | | - Subrata Sinha
- 2National Brain Research Centre, Gurgaon, Haryana, India
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