1
|
Grant-McAuley W, Morgenlander W, Hudelson SE, Thakar M, Piwowar-Manning E, Clarke W, Breaud A, Blankson J, Wilson E, Ayles H, Bock P, Moore A, Kosloff B, Shanaube K, Meehan SA, van Deventer A, Fidler S, Hayes R, Ruczinski I, Kammers K, Laeyendecker O, Larman HB, Eshleman SH. Comprehensive profiling of pre-infection antibodies identifies HIV targets associated with viremic control and viral load. Front Immunol 2023; 14:1178520. [PMID: 37744365 PMCID: PMC10512082 DOI: 10.3389/fimmu.2023.1178520] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 08/15/2023] [Indexed: 09/26/2023] Open
Abstract
Background High HIV viral load (VL) is associated with increased transmission risk and faster disease progression. HIV controllers achieve viral suppression without antiretroviral (ARV) treatment. We evaluated viremic control in a community-randomized trial with >48,000 participants. Methods A massively multiplexed antibody profiling system, VirScan, was used to quantify pre- and post-infection antibody reactivity to HIV peptides in 664 samples from 429 participants (13 controllers, 135 viremic non-controllers, 64 other non-controllers, 217 uninfected persons). Controllers had VLs <2,000 copies/mL with no ARV drugs detected at the first HIV-positive visit and one year later. Viremic non-controllers had VLs 2,000 copies/mL with no ARV drugs detected at the first HIV-positive visit. Other non-controllers had either ARV drugs detected at the first HIV-positive visit (n=47) or VLs <2,000 copies/mL with no ARV drugs detected at only one HIV-positive visit (n=17). Results We identified pre-infection HIV antibody reactivities that correlated with post-infection VL. Pre-infection reactivity to an epitope in the HR2 domain of gp41 was associated with controller status and lower VL. Pre-infection reactivity to an epitope in the C2 domain of gp120 was associated with non-controller status and higher VL. Different patterns of antibody reactivity were observed over time for these two epitopes. Conclusion These studies suggest that pre-infection HIV antibodies are associated with controller status and modulation of HIV VL. These findings may inform research on antibody-based interventions for HIV treatment.
Collapse
Affiliation(s)
- Wendy Grant-McAuley
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - William Morgenlander
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
- Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Sarah E. Hudelson
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Manjusha Thakar
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Estelle Piwowar-Manning
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - William Clarke
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Autumn Breaud
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Joel Blankson
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Ethan Wilson
- Statistical Center for HIV/AIDS Research and Prevention, Fred Hutchinson Cancer Research Center, Seattle, WA, United States
| | - Helen Ayles
- Zambart, University of Zambia School of Public Health, Lusaka, Zambia
- Clinical Research Department, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Peter Bock
- Desmond Tutu TB Center, Department of Paediatrics and Child Health, Stellenbosch University, Western Cape, South Africa
| | | | - Barry Kosloff
- Zambart, University of Zambia School of Public Health, Lusaka, Zambia
- Clinical Research Department, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Kwame Shanaube
- Zambart, University of Zambia School of Public Health, Lusaka, Zambia
| | - Sue-Ann Meehan
- Desmond Tutu TB Center, Department of Paediatrics and Child Health, Stellenbosch University, Western Cape, South Africa
| | - Anneen van Deventer
- Desmond Tutu TB Center, Department of Paediatrics and Child Health, Stellenbosch University, Western Cape, South Africa
| | - Sarah Fidler
- Department of Infectious Disease, Imperial College London, London, United Kingdom
| | - Richard Hayes
- Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Ingo Ruczinski
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Kai Kammers
- Quantitative Sciences Division, Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Oliver Laeyendecker
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Baltimore, MD, United States
| | - H. Benjamin Larman
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
- Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Susan H. Eshleman
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| |
Collapse
|
2
|
Thakar M, Noumbissi ME, Stins MF. Microvascular Environment Influences Brain Microvascular Heterogeneity: Relative Roles of Astrocytes and Oligodendrocytes for the EPCR Expression in the Brain Endothelium. Int J Mol Sci 2023; 24:6908. [PMID: 37108071 PMCID: PMC10138692 DOI: 10.3390/ijms24086908] [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: 12/30/2022] [Revised: 03/25/2023] [Accepted: 04/04/2023] [Indexed: 04/29/2023] Open
Abstract
Postmortem neuropathology shows clear regional differences in many brain diseases. For example, brains from cerebral malaria (CM) patients show more hemorrhagic punctae in the brain's white matter (WM) than grey matter (GM). The underlying reason for these differential pathologies is unknown. Here, we assessed the effect of the vascular microenvironment on brain endothelial phenotype, focusing endothelial protein C receptor (EPCR). We demonstrate that the basal level of EPCR expression in cerebral microvessels is heterogeneous in the WM compared to the GM. We used in vitro brain endothelial cell cultures and showed that the upregulation of EPCR expression was associated with exposure to oligodendrocyte conditioned media (OCM) compared to astrocyte conditioned media (ACM). Our findings shed light on the origin of the heterogeneity of molecular phenotypes at the microvascular level and might help better understand the variation in pathology seen in CM and other neuropathologies associated with vasculature in various brain regions.
Collapse
Affiliation(s)
- Manjusha Thakar
- Malaria Research Institute, Department Molecular Microbiology & Immunology, Johns Hopkins School Public Health, Baltimore, MD 21205, USA
| | - Midrelle E. Noumbissi
- Malaria Research Institute, Department Molecular Microbiology & Immunology, Johns Hopkins School Public Health, Baltimore, MD 21205, USA
- Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA
| | - Monique F. Stins
- Malaria Research Institute, Department Molecular Microbiology & Immunology, Johns Hopkins School Public Health, Baltimore, MD 21205, USA
- Biomedical Research Institute of Southern California, Oceanside, CA 92056, USA
| |
Collapse
|
3
|
Park HS, Shapiro JR, Sitaras I, Woldemeskel BA, Garliss CC, Dziedzic A, Sachithanandham J, Jedlicka AE, Caputo CA, Rousseau KE, Thakar M, Suwanmanee S, Hauk P, Aliyu L, Majewska NI, Koley S, Patel B, Broderick P, Mosnaim G, Heath SL, Spivak ES, Shenoy A, Bloch EM, Gniadek TJ, Shoham S, Casadevall A, Hanley D, Cox AL, Laeyendecker O, Betenbaugh MJ, Cramer SM, Mostafa HH, Pekosz A, Blankson JN, Klein SL, Tobian AA, Sullivan D, Gebo KA. Adaptive immune responses in vaccinated patients with symptomatic SARS-CoV-2 Alpha infection. JCI Insight 2022; 7:e155944. [PMID: 35104245 PMCID: PMC8983140 DOI: 10.1172/jci.insight.155944] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 01/26/2022] [Indexed: 11/18/2022] Open
Abstract
Benchmarks for protective immunity from infection or severe disease after SARS-CoV-2 vaccination are still being defined. Here, we characterized virus neutralizing and ELISA antibody levels, cellular immune responses, and viral variants in 4 separate groups: healthy controls (HCs) weeks (early) or months (late) following vaccination in comparison with symptomatic patients with SARS-CoV-2 after partial or full mRNA vaccination. During the period of the study, most symptomatic breakthrough infections were caused by the SARS-CoV-2 Alpha variant. Neutralizing antibody levels in the HCs were sustained over time against the vaccine parent virus but decreased against the Alpha variant, whereas IgG titers and T cell responses against the parent virus and Alpha variant declined over time. Both partially and fully vaccinated patients with symptomatic infections had lower virus neutralizing antibody levels against the parent virus than the HCs, similar IgG antibody titers, and similar virus-specific T cell responses measured by IFN-γ. Compared with HCs, neutralization activity against the Alpha variant was lower in the partially vaccinated infected patients and tended to be lower in the fully vaccinated infected patients. In this cohort of breakthrough infections, parent virus neutralization was the superior predictor of breakthrough infections with the Alpha variant of SARS-CoV-2.
Collapse
Affiliation(s)
- Han-Sol Park
- W. Harry Feinstone Department of Molecular Microbiology and Immunology and
| | - Janna R. Shapiro
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Ioannis Sitaras
- W. Harry Feinstone Department of Molecular Microbiology and Immunology and
| | - Bezawit A. Woldemeskel
- Department of Medicine, Division of Infectious Diseases, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Caroline C. Garliss
- Department of Medicine, Division of Infectious Diseases, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Amanda Dziedzic
- W. Harry Feinstone Department of Molecular Microbiology and Immunology and
| | | | - Anne E. Jedlicka
- W. Harry Feinstone Department of Molecular Microbiology and Immunology and
| | | | - Kimberly E. Rousseau
- Department of Medicine, Division of Infectious Diseases, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Manjusha Thakar
- W. Harry Feinstone Department of Molecular Microbiology and Immunology and
| | - San Suwanmanee
- W. Harry Feinstone Department of Molecular Microbiology and Immunology and
| | - Pricila Hauk
- Advanced Mammalian Biomanufacturing Innovation Center, Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland, USA
| | - Lateef Aliyu
- Advanced Mammalian Biomanufacturing Innovation Center, Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland, USA
| | - Natalia I. Majewska
- Advanced Mammalian Biomanufacturing Innovation Center, Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland, USA
| | - Sushmita Koley
- Department of Chemical and Biological Engineering and Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA
| | - Bela Patel
- Critical Care Medicine, University of Texas Health, Houston, Texas, USA
| | | | - Giselle Mosnaim
- Division of Allergy and Immunology, Department of Medicine, Northshore University Health System, Evanston, Illinois, USA
| | - Sonya L. Heath
- Department of Medicine, Division of Infectious Diseases, University of Alabama Birmingham, Alabama, USA
| | - Emily S. Spivak
- Department of Medicine, Division of Infectious Diseases, University of Utah, Salt Lake City, Utah, USA
| | - Aarthi Shenoy
- Hematology Oncology, Medstar Washington Hospital Center, Washington, DC, USA
| | - Evan M. Bloch
- Department of Pathology, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Thomas J. Gniadek
- Department of Pathology and Laboratory Medicine, Northshore University Health System, Evanston, Illinois, USA
| | - Shmuel Shoham
- Department of Medicine, Division of Infectious Diseases, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Arturo Casadevall
- W. Harry Feinstone Department of Molecular Microbiology and Immunology and
| | - Daniel Hanley
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Andrea L. Cox
- W. Harry Feinstone Department of Molecular Microbiology and Immunology and
- Department of Medicine, Division of Infectious Diseases, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Oliver Laeyendecker
- Department of Medicine, Division of Infectious Diseases, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
- Division of Intramural Research, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland, USA
| | - Michael J. Betenbaugh
- Advanced Mammalian Biomanufacturing Innovation Center, Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland, USA
| | - Steven M. Cramer
- Department of Chemical and Biological Engineering and Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA
| | - Heba H. Mostafa
- Department of Pathology, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Andrew Pekosz
- W. Harry Feinstone Department of Molecular Microbiology and Immunology and
- Department of Medicine, Division of Infectious Diseases, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Joel N. Blankson
- Department of Medicine, Division of Infectious Diseases, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Sabra L. Klein
- W. Harry Feinstone Department of Molecular Microbiology and Immunology and
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
- Department of Medicine, Division of Infectious Diseases, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Aaron A.R. Tobian
- Department of Pathology, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - David Sullivan
- W. Harry Feinstone Department of Molecular Microbiology and Immunology and
| | - Kelly A. Gebo
- Department of Medicine, Division of Infectious Diseases, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| |
Collapse
|
4
|
Thakar M, Hu Y, Morreale M, Lerner L, Lin WY, Sen R, Cai Y, Karunasena E, Thakar M, Saggi S, Keer H, Ahuja N. Correction: A novel epigenetic modulating agent sensitizes pancreatic cells to a chemotherapy agent. PLoS One 2020; 15:e0242974. [PMID: 33216806 PMCID: PMC7678985 DOI: 10.1371/journal.pone.0242974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
5
|
Stein-O'Brien G, Kagohara LT, Li S, Thakar M, Ranaweera R, Ozawa H, Cheng H, Considine M, Schmitz S, Favorov AV, Danilova LV, Califano JA, Izumchenko E, Gaykalova DA, Chung CH, Fertig EJ. Integrated time course omics analysis distinguishes immediate therapeutic response from acquired resistance. Genome Med 2018; 10:37. [PMID: 29792227 PMCID: PMC5966898 DOI: 10.1186/s13073-018-0545-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [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: 01/23/2018] [Accepted: 05/01/2018] [Indexed: 02/06/2023] Open
Abstract
Background Targeted therapies specifically act by blocking the activity of proteins that are encoded by genes critical for tumorigenesis. However, most cancers acquire resistance and long-term disease remission is rarely observed. Understanding the time course of molecular changes responsible for the development of acquired resistance could enable optimization of patients’ treatment options. Clinically, acquired therapeutic resistance can only be studied at a single time point in resistant tumors. Methods To determine the dynamics of these molecular changes, we obtained high throughput omics data (RNA-sequencing and DNA methylation) weekly during the development of cetuximab resistance in a head and neck cancer in vitro model. The CoGAPS unsupervised algorithm was used to determine the dynamics of the molecular changes associated with resistance during the time course of resistance development. Results CoGAPS was used to quantify the evolving transcriptional and epigenetic changes. Applying a PatternMarker statistic to the results from CoGAPS enabled novel heatmap-based visualization of the dynamics in these time course omics data. We demonstrate that transcriptional changes result from immediate therapeutic response or resistance, whereas epigenetic alterations only occur with resistance. Integrated analysis demonstrates delayed onset of changes in DNA methylation relative to transcription, suggesting that resistance is stabilized epigenetically. Conclusions Genes with epigenetic alterations associated with resistance that have concordant expression changes are hypothesized to stabilize the resistant phenotype. These genes include FGFR1, which was associated with EGFR inhibitors resistance previously. Thus, integrated omics analysis distinguishes the timing of molecular drivers of resistance. This understanding of the time course progression of molecular changes in acquired resistance is important for the development of alternative treatment strategies that would introduce appropriate selection of new drugs to treat cancer before the resistant phenotype develops. Electronic supplementary material The online version of this article (10.1186/s13073-018-0545-2) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Genevieve Stein-O'Brien
- Institute of Genetic Medicine, Johns Hopkins University, Baltimore, MD, USA.,Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
| | - Luciane T Kagohara
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
| | - Sijia Li
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
| | - Manjusha Thakar
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
| | - Ruchira Ranaweera
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA.,Department of Head and Neck-Endocrine Oncology, Moffitt Cancer Center, Tampa, FL, USA
| | - Hiroyuki Ozawa
- Department of Otorhinolaryngology-Head and Neck Surgery, Keio University School of Medicine, Tokyo, Japan
| | - Haixia Cheng
- Department of Surgery - Otolaryngology-Head and Neck Surgery, University of Utah,
- Salt Lake City, UT, USA
| | - Michael Considine
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
| | - Sandra Schmitz
- Head and Neck Surgery Unit, St Luc University Hospital, Brussels, Belgium
| | - Alexander V Favorov
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA.,Laboratory of Systems Biology and Computational Genetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, Russia
| | - Ludmila V Danilova
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA.,Laboratory of Systems Biology and Computational Genetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, Russia
| | - Joseph A Califano
- Department of Surgery, UC San Diego Moores Cancer Center, La Jolla, CA, USA
| | - Evgeny Izumchenko
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University, Baltimore, MD, USA
| | - Daria A Gaykalova
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University, Baltimore, MD, USA
| | - Christine H Chung
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA. .,Department of Head and Neck-Endocrine Oncology, Moffitt Cancer Center, Tampa, FL, USA.
| | - Elana J Fertig
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA.
| |
Collapse
|
6
|
De Carvalho Fischer C, Hu Y, Morreale M, Lin WY, Wali A, Thakar M, Karunasena E, Sen R, Cai Y, Murphy L, Zahnow CA, Keer H, Thakar M, Ahuja N. Treatment with epigenetic agents profoundly inhibits tumor growth in leiomyosarcoma. Oncotarget 2018; 9:19379-19395. [PMID: 29721210 PMCID: PMC5922404 DOI: 10.18632/oncotarget.25056] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [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: 11/06/2017] [Accepted: 03/15/2018] [Indexed: 01/08/2023] Open
Abstract
Leiomyosarcomas are rare mesenchymal neoplasms characterized by a smooth muscle differentiation pattern. Due to the extremely poor prognosis in patients, the development of novel chemotherapeutic regimens remains critically important. In this study, multiple leiomyosarcoma cell lines, SK-UT1, SK-LMS1, and MES-SA were treated with varying doses of the DNA Methyltransferase Inhibitors (DNMTi) 5-azacitidine (Aza), 5-aza-2-deoxycytidine (DAC), and guadecitabine (SGI-110). The effect of these epigenetic modulators was measured using both in-vitro and in-vivo models. Of the three epigenetic modulators, Guadecitabine was the most effective at decreasing cell survival in LMS cell lines. SK-UT1 was found to be the more sensitive to all three epigenetic modulators, while SK-LMS1 and MES-SA were more resistant. The contrast in sensitivity seen was also represented by the increase in apoptosis in Aza and guadecitabine. In parallel with Aza, guadecitabine was observed to also arrest the cell cycle. Treatment with guadecitabine led to a decrease in growth across the spectrum of sensitivity in LMS cell lines, both in a delayed in vitro and in vivo model; in parallel experiments, apoptotic pathways were activated in sensitive and less sensitive lines. Additional studies are required to explore potential therapeutic applications and mechanisms for leiomyosarcoma treatment.
Collapse
Affiliation(s)
- Cynthia De Carvalho Fischer
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States.,Institut für Allgemein, Viszeral und Transplantationschirurgie, Charite Universitätsmedizin Berlin, Berlin, Germany
| | - Yue Hu
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States.,Department of Surgical Oncology, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, Zhejiang, P.R. China
| | - Michael Morreale
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Wan Ying Lin
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Akhil Wali
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Maya Thakar
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Enusha Karunasena
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Rupashree Sen
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Yi Cai
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Lauren Murphy
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Cynthia A Zahnow
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Harold Keer
- Astex Pharmaceuticals Inc., Pleasanton, CA, United States
| | - Manjusha Thakar
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Nita Ahuja
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States.,Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, United States.,Department of Urology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| |
Collapse
|
7
|
Fertig EJ, Ozawa H, Thakar M, Howard JD, Kagohara LT, Krigsfeld G, Ranaweera RS, Hughes RM, Perez J, Jones S, Favorov AV, Carey J, Stein-O'Brien G, Gaykalova DA, Ochs MF, Chung CH. CoGAPS matrix factorization algorithm identifies transcriptional changes in AP-2alpha target genes in feedback from therapeutic inhibition of the EGFR network. Oncotarget 2018; 7:73845-73864. [PMID: 27650546 PMCID: PMC5342018 DOI: 10.18632/oncotarget.12075] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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: 05/11/2016] [Accepted: 09/02/2016] [Indexed: 01/03/2023] Open
Abstract
Patients with oncogene driven tumors are treated with targeted therapeutics including EGFR inhibitors. Genomic data from The Cancer Genome Atlas (TCGA) demonstrates molecular alterations to EGFR, MAPK, and PI3K pathways in previously untreated tumors. Therefore, this study uses bioinformatics algorithms to delineate interactions resulting from EGFR inhibitor use in cancer cells with these genetic alterations. We modify the HaCaT keratinocyte cell line model to simulate cancer cells with constitutive activation of EGFR, HRAS, and PI3K in a controlled genetic background. We then measure gene expression after treating modified HaCaT cells with gefitinib, afatinib, and cetuximab. The CoGAPS algorithm distinguishes a gene expression signature associated with the anticipated silencing of the EGFR network. It also infers a feedback signature with EGFR gene expression itself increasing in cells that are responsive to EGFR inhibitors. This feedback signature has increased expression of several growth factor receptors regulated by the AP-2 family of transcription factors. The gene expression signatures for AP-2alpha are further correlated with sensitivity to cetuximab treatment in HNSCC cell lines and changes in EGFR expression in HNSCC tumors with low CDKN2A gene expression. In addition, the AP-2alpha gene expression signatures are also associated with inhibition of MEK, PI3K, and mTOR pathways in the Library of Integrated Network-Based Cellular Signatures (LINCS) data. These results suggest that AP-2 transcription factors are activated as feedback from EGFR network inhibition and may mediate EGFR inhibitor resistance.
Collapse
Affiliation(s)
- Elana J Fertig
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
| | - Hiroyuki Ozawa
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA.,Department of Otorhinolaryngology-Head and Neck Surgery, Keio University School of Medicine, Tokyo, Japan
| | - Manjusha Thakar
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
| | - Jason D Howard
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
| | - Luciane T Kagohara
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
| | - Gabriel Krigsfeld
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
| | - Ruchira S Ranaweera
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA.,Department of Head and Neck-Endocrine Oncology, Moffitt Cancer Center, Tampa, FL, USA
| | - Robert M Hughes
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
| | - Jimena Perez
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA
| | - Siân Jones
- Personal Genome Diagnostics, Baltimore, MD, USA
| | - Alexander V Favorov
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA.,Vavilov Institute of General Genetics, Moscow, Russia.,Research Institute for Genetics and Selection of Industrial Microorganisms, Moscow, Russia
| | - Jacob Carey
- Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA
| | - Genevieve Stein-O'Brien
- Institute of Genetic Medicine, Johns Hopkins University, Baltimore, MD, USA.,Lieber Institute for Brain Development, Baltimore, MD, USA
| | - Daria A Gaykalova
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Michael F Ochs
- Department of Mathematics and Statistics, The College of New Jersey, Ewing Township, NJ, USA
| | - Christine H Chung
- Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD, USA.,Department of Head and Neck-Endocrine Oncology, Moffitt Cancer Center, Tampa, FL, USA
| |
Collapse
|
8
|
Shaikh N, Gupte A, Dharmshale S, Pokkali S, Thakar M, Upadhye VJ, Ordonez AA, Kinikar A, Gupte N, Mave V, Kagal A, Gupta A, Lalvani A, Paranjpe R, Bharadwaj R, Jain SK. Novel interferon-gamma assays for diagnosing tuberculosis in young children in India. Int J Tuberc Lung Dis 2018; 21:412-419. [PMID: 28284256 DOI: 10.5588/ijtld.16.0428] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
SETTING The tuberculin skin test (TST) and interferon-gamma release assays (IGRAs) are used as supportive evidence to diagnose active tuberculosis (TB). Novel IGRAs could improve diagnosis, but data are lacking in young children. DESIGN Children (age 5 years) with suspected TB were prospectively screened at a tertiary hospital in Pune, India; the children underwent TST, and standard (early secretory antigenic target 6 and culture filtrate protein 10) and enhanced (five additional novel antigens) enzyme-linked immunospot (ELISpot) assays. RESULTS Of 313 children (median age 30 months) enrolled, 92% had received bacille Calmette-Guérin vaccination, 53% were malnourished and 9% were coinfected with the human immunodeficiency virus (HIV); 48 (15%) had TB, 128 (41%) did not, and TB could not be ruled out in 137 (44%). The sensitivity of enhanced (45%) and standard (42%) ELISpot assays for diagnosing TB was better than that of TST (20%) (P 0.03); however, enhanced ELISpot was not more sensitive than the standard ELISpot assay (P = 0.50). The specificity of enhanced ELISpot, standard ELISpot and TST was respectively 82% (95%CI 74-89), 88% (95%CI 81-94) and 98% (95%CI 93-100). Rv3879c and Rv3615c, previously reported to be promising antigens, failed to improve the diagnostic performance of the ELISpot assay. CONCLUSION The TST and the standard and novel ELISpot assays performed poorly in diagnosing active TB among young children in India.
Collapse
Affiliation(s)
- N Shaikh
- National AIDS Research Institute, Pune, India
| | - A Gupte
- Johns Hopkins Bloomberg School of Public Health, Baltimore, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - S Dharmshale
- Byramjee Jeejeebhoy Government Medical College, Pune, India
| | - S Pokkali
- Department of Pediatrics, Center for Tuberculosis Research, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - M Thakar
- National AIDS Research Institute, Pune, India
| | | | - A A Ordonez
- Department of Pediatrics, Center for Tuberculosis Research, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - A Kinikar
- Byramjee Jeejeebhoy Government Medical College, Pune, India
| | - N Gupte
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA, Byramjee Jeejeebhoy Government Medical College, Pune, India
| | - V Mave
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA, Byramjee Jeejeebhoy Government Medical College, Pune, India
| | - A Kagal
- Byramjee Jeejeebhoy Government Medical College, Pune, India
| | - A Gupta
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | | | - R Paranjpe
- National AIDS Research Institute, Pune, India
| | - R Bharadwaj
- Byramjee Jeejeebhoy Government Medical College, Pune, India
| | - S K Jain
- Department of Pediatrics, Center for Tuberculosis Research, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| |
Collapse
|
9
|
Fischer CDC, Hu Y, Singh J, Thakar M, Thakar M, Ahuja N. Abstract A35: Treatment with demethylating drugs inhibits tumor growth in leiomyosarcoma cell lines and xenograft models. Clin Cancer Res 2018. [DOI: 10.1158/1557-3265.sarcomas17-a35] [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: Leiomyosarcomas are rare mesenchymal neoplasms characterized by a smooth-muscle differentiation pattern. Patients show poor disease-specific survival due to high recurrence rates and low response to chemotherapy and radiation. Development of novel chemotherapeutic regimens is the need of the hour. Epigenetic mechanisms such as hypermethylation of gene promotor regions lead to abnormal gene silencing and have been found to influence the initiation and progression of cancer. Epigenetic drugs have been approved for treatment of various malignancies such as myelodysplastic syndrome, acute myeloid leukemias, and subsets of lymphomas. This study aims to understand the potential efficacy of epigenetic drugs called DNA methyltransferease inhibitors (DNMTi) in the treatment of leiomyosarcomas.
Methods: DNMTi used in this study include azacytidine (Aza), decitabine (Dac), and guadecitabine. Aza and Dac are antimetabolites, which get incorporated onto RNA and DNA, respectively, leading to inhibition of DNMT. Guadecitabine is a novel prodrug for Dac with a longer half-life. Various leiomyosarcoma cell lines (SK-UT1, SK-LMS, and MES) were treated with varying doses of guadecitabine (0.01-5 ug/ml), decitabine (Dac: 0.1 uM-5uM), or azacitidine (Aza: 0.1 uM-5 uM) and incubated for a maximum of five days. Cell viability was measured daily via MTT assay. To further characterize the mechanism(s) of drug induced cell death, Caspase Glo® Assay (G8090) was utilized as a measure of apoptosis by proxy of Caspase 3 and 7 activity. CellToxTM Green Cytotoxicity Assay was then employed to measure membrane integrity, thus quantifying nonspecific cell death. This would further measure the toxic effect of the demethylating drugs on leiomyosarcoma cell lines. We also studied the effect of guadecitabine (3 mg/kg, 2x/week) treatment in vivo, using subcutaneous xenografts in NOD/SCID mice. Statistical analysis was conducted using GraphPad Prism 6.
Results: Decreased cell viability was observed in all three leiomyosarcoma cell lines upon exposure to demethylating agents. SK-UT1 showed the highest sensitivity to all three epigenetic drugs (IC50 values: guadecitabine-0.3 uM, Aza-2.1 uM, and Dac-2.3 uM), MES was sensitive to Aza and guadecitabine (IC50 values: Aza-3.2 uM, guadecitabine-6.14 uM, and Dac-11.77 uM), and SK-LMS was sensitive only to Aza (IC50 values: Aza-2.6 uM, guadecitabine-9.6 uM, and Dac-10.3 uM). To better understand the effect of guadecitabine and AZA on these cell lines, we measured the Caspase 3/7 activity of SK-UT1 and SK-LMS using a Promega kit as a readout for apoptosis. The Caspase activity measured in SKUT1 was remarkably higher in both drugs when compared to that of SK-LMS in presence of same drugs. The amount of necrosis measured in both cell lines in presence of guadecitabine and Aza was negligible. Considerable tumor growth inhibition was also observed after in vivo treatment with guadecitabine in both SK-UT1 and SK-LMS mice xenografts.
Conclusion: The use of demethylating agents leads to substantial inhibition of tumor growth in leiomyosarcoma cell lines and xenograft models. Further studies are required to explore the potential therapeutic applications and precise mechanism of action of demethylating agents in leiomyosarcoma treatment.
Funding supported by ASTEX Pharmaceuticals.
Note: uM= Micromole
Citation Format: Cynthia De Carvalho Fischer, Yue Hu, Jasvinder Singh, Maya Thakar, Manjusha Thakar, Nita Ahuja. Treatment with demethylating drugs inhibits tumor growth in leiomyosarcoma cell lines and xenograft models [abstract]. In: Proceedings of the AACR Conference on Advances in Sarcomas: From Basic Science to Clinical Translation; May 16-19, 2017; Philadelphia, PA. Philadelphia (PA): AACR; Clin Cancer Res 2018;24(2_Suppl):Abstract nr A35.
Collapse
Affiliation(s)
| | - Yue Hu
- 2Daping Hospital, Third Military Medical University, Chongqing, China
| | | | | | | | | |
Collapse
|
10
|
Stein-O'Brien G, Kagohara LT, Li S, Thakar M, Ranaweera R, Considine M, Danilova LV, Ozawa H, Califano JA, Gaykalova DA, Ochs MF, Chung CH, Fertig EJ. Abstract 05: Untangling the gene-epigenome networks: Timing of epigenetic regulation of gene expression in acquired cetuximab resistance gene programs. Clin Cancer Res 2017. [DOI: 10.1158/1557-3265.aacrahns17-05] [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
The current study performs time course RNA-seq and DNA methylation profiling to determine the complex interactions between gene expression and epigenetic changes in acquired therapeutic resistance. The genomics era provides widespread characterization of the genomic landscape of tumors and has enabled precision treatment strategies. Currently, epidermal growth factor receptor (EGFR) inhibitors are the only FDA-approved targeted therapy for clinical use in head and neck squamous cell carcinoma (HNSCC). EGFR inhibitors are only effective in a subset of each of these tumors. Moreover, patients with de novo sensitivity to EGFR inhibitors often subsequently acquire resistance and succumb to their tumors. Numerous genetic and epigenetic alterations occur in tumors with acquired resistance. However, their timing and function remain unknown. Therefore, we develop new computational techniques to find gene programs associated with the acquisition of resistance.
High-throughput transcriptional profiling enables unprecedented characterization of individual genes during cancer treatment. However, identifying and targeting mechanisms of EGFR resistance from these high-throughput data requires novel systems biology techniques that can discriminate altered cellular signaling pathways in response to cancer treatment. Therefore, we developed a new bioinformatics algorithm Coordinated Gene Activity in Pattern Sets (CoGAPS) to quantify multiplexed regulation and gene reuse in oncogenic signaling. To test this algorithm, we modified the HaCaT keratinocyte cell line model of premalignancy to simulate cancer cells with constitutive overexpression of wild-type EGFR and with activating mutations in HRAS and PIK3CA in a controlled genetic background. We apply CoGAPS to gene expression data from these models. This algorithm quantified relative changes in cellular signaling pathway activity in these data, not accessible to standard gene comparisons. Increases in CoGAPS pathway signatures from HRAS also occurred in gene expression data from the cetuximab resistant HNSCC cell line (1CC8) relative to its parental, sensitive cell line (UMSCC1).
Investigation of the mechanisms of acquired resistance has previously been limited by reliance on case-control comparisons between sensitive and resistant cells, such as the UMSCC1 and 1CC8 cell lines. Since activity in cellular signaling pathways evolves during cetuximab resistance, it is essential to extend these case-control paradigms to quantify the dynamics responsible for resistance. Therefore, we developed a novel time course analysis to determine the molecular mechanisms of acquired cetuximab resistance in HNSCC. Specifically, we treated the cetuximab sensitive SCC25 HNSCC cell line over generations with both cetuximab and PBS. This long-term treatment protocol models the progression of acquired therapeutic resistance, including controls for clonal selection unrelated to treatment. Overexpression of the previous HRAS gene program also occurs in gene expression data measured during acquired cetuximab resistance in SCC25. We also measure DNA methylation during this time course to find the driver of this aberrant signaling associated with resistance. We apply CoGAPS analysis to the time course data for both DNA methylation and gene expression. This analysis distinguished early gene expression changes from cetuximab treatment from longer-term epigenetic alterations to gene expression during acquired resistance. Epigenetic regulation of FGFR1 expression emerged as the dominant mechanism of acquired therapeutic resistance in this system. Thus, our integration of time course DNA methylation and gene expression data enables unprecedented inference of the timing of targetable gene-epigenome programs responsible for acquired resistance.
Citation Format: Genevieve Stein-O'Brien, Luciane T. Kagohara, Sijia Li, Manjusha Thakar, Ruchira Ranaweera, Michael Considine, Ludmila V. Danilova, Hiroyuki Ozawa, Joseph A. Califano, Daria A. Gaykalova, Michael F. Ochs, Christine H. Chung, Elana J. Fertig. Untangling the gene-epigenome networks: Timing of epigenetic regulation of gene expression in acquired cetuximab resistance gene programs [abstract]. In: Proceedings of the AACR-AHNS Head and Neck Cancer Conference: Optimizing Survival and Quality of Life through Basic, Clinical, and Translational Research; April 23-25, 2017; San Diego, CA. Philadelphia (PA): AACR; Clin Cancer Res 2017;23(23_Suppl):Abstract nr 05.
Collapse
Affiliation(s)
| | | | - Sijia Li
- 1Johns Hopkins University, Baltimore, MD,
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Malogolowkin MH, Hemmer MT, Le-Rademacher J, Hale GA, Mehta PA, Smith AR, Kitko C, Abraham A, Abdel-Azim H, Dandoy C, Angel Diaz M, Gale RP, Guilcher G, Hayashi R, Jodele S, Kasow KA, MacMillian ML, Thakar M, Wirk BM, Woolfrey A, Thiel EL. Outcomes following autologous hematopoietic stem cell transplant for patients with relapsed Wilms' tumor: a CIBMTR retrospective analysis. Bone Marrow Transplant 2017; 52:1549-1555. [PMID: 28869618 PMCID: PMC5665725 DOI: 10.1038/bmt.2017.178] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [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: 11/16/2016] [Revised: 04/18/2017] [Accepted: 06/14/2017] [Indexed: 12/04/2022]
Abstract
Despite the dramatic improvement in the overall survival for patients diagnosed with Wilms’ tumor (WT), the outcomes for those that experience relapse have remained disappointing. We describe the outcomes of 253 patients with relapsed WT who received high-dose chemotherapy (HDT) followed by autologous hematopoietic stem cell transplant (HCT) between 1990 and 2013, and reported to the Center for International Blood and Marrow Transplantation Research (CIBMTR). The 5-year estimates for event free survival (EFS) and overall survival (OS) were 36% (95% CI; 29 – 43%) and 45% (95% CI; 38 – 51%) respectively. Relapse of primary disease was the cause of death in 81% of the population. EFS, OS, relapse and transplant-related mortality (TRM) showed no significant differences when broken down by disease status at transplant, time from diagnosis to transplant, year of transplant or conditioning regimen. Our data suggest that HDT followed by autologous HCT for relapsed WT is well tolerated and outcomes are similar to those reported in the literature. Since attempts to conduct a randomized trial comparing maintenance chemotherapy with consolidation versus high-dose chemotherapy followed by stem cell transplant have failed, one should balance the potential benefits with the yet unknown long-term risks. Since disease recurrence continues to be the most common cause of death, future research should focus on the development of consolidation therapies for those patients achieving complete response to therapy.
Collapse
Affiliation(s)
- M H Malogolowkin
- Davis Cancer Center, University of California, Sacramento, CA, USA
| | - M T Hemmer
- CIBMTR (Center for International Blood and Marrow Research), Department of Medicine, Medical College of Wisconsin, Milwaukee, WI, USA
| | - J Le-Rademacher
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, USA
| | - G A Hale
- Department of Hematology/Oncology, Johns Hopkins All Children's Hospital, St Petersburg, FL, USA
| | - P A Mehta
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - A R Smith
- Department of Pediatrics, University of Minnesota, Minneapolis, MN, USA
| | - C Kitko
- Vanderbilt University Medical Center, Nashville, TN, USA
| | - A Abraham
- Division of Blood and Marrow Transplantation, Center for Cancer and Blood Disorders, Children's National Medical Center, Washington, DC, USA
| | - H Abdel-Azim
- Division of Hematology, Oncology and Blood & Marrow Transplantation, Children's Hospital Los Angeles, University of Southern California Keck School of Medicine, Los Angeles, CA, USA
| | - C Dandoy
- Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - M Angel Diaz
- Department of Hematology/Oncology, Hospital Infantil Universitario Nino Jesus, Madrid, Spain
| | - R P Gale
- Hematology Research Centre, Division of Experimental Medicine, Department of Medicine, Imperial College London, London, UK
| | - G Guilcher
- Section of Paediatric Oncology and Blood and Marrow Transplant, Alberta Children's Hospital, Calgary, AB, Canada
| | - R Hayashi
- Division of Pediatric Hematology/Oncology, Department of Pediatrics, Washington University School of Medicine in St Louis, St Louis, MO, USA
| | - S Jodele
- Cincinnatti Children's Hospital, Cincinnati, OH, USA
| | - K A Kasow
- Division of Hematology-Oncology, Department of Pediatrics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - M L MacMillian
- University of Minnesota Blood and Marrow Transplant Program, Minneapolis, MN, USA
| | - M Thakar
- Medical College of Wisconsin, Milwaukee, WI, USA
| | - B M Wirk
- Division of Bone Marrow Transplant, Seattle Cancer Care Alliance, Seattle, WA, USA
| | - A Woolfrey
- Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - E L Thiel
- Medical College of Wisconsin, Milwaukee, WI, USA
| |
Collapse
|
12
|
Kagohara LT, Stein-O'Brien G, Li S, Thakar M, Ranaweera R, Considine M, Califano JA, Chung CH, Gaykalova D, Fertig EJ. Abstract 86: Time course analysis of gene expression and epigenetic interactions in acquired cetuximab resistance in head and neck squamous cell carcinoma. Cancer Res 2017. [DOI: 10.1158/1538-7445.am2017-86] [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
The current study performs time course genomics and epigenomics profiling to determine the complex dynamics of interactions between gene expression and epigenetic changes that alter cellular signaling and drive acquired therapeutic resistance. Targeted therapeutic agents block the activity of specific molecules critical for tumor progression. Cetuximab is a monoclonal antibody against EGFR currently used in the treatment of head and neck squamous cell carcinoma (HNSCC) and metastatic colorectal cancers. Similar to many targeted therapeutics, cetuximab improves survival for a brief period of two years, after which most patients acquire resistance resulting in tumor progression or recurrence. The mechanisms that alter cellular signaling pathways and cause resistance are poorly understood. We hypothesize that the molecular alterations that precede the resistance phenotype are more likely to be responsible for the resistance than the widespread alterations observed once the resistance is established. To test this hypothesis, we develop a novel time course experimental and bioinformatics model of acquired resistance. Specifically, this protocol enables weekly profiling of RNA, DNA, and proliferation as cetuximab resistance developed in vitro. We apply the CoGAPS bioinformatics algorithm to perform integrated analysis of gene expression and DNA methylation. This analysis distinguishes signatures of sustained activation of cellular pathways in response to treatment from signatures of clonal expansion associated with acquired cetuximab resistance. Despite identifying massive changes in gene expression driven by therapeutic response, only the expression changes associated with the acquired resistance, and not response to treatment, have corresponding epigenetic signatures. The genomic signature associated with acquired resistance is enriched for gene targets of the AP-2 family of transcription factors. In a previous study, we found that these gene targets were overexpressed after short-term treatment in cetuximab sensitive cell lines and HNSCC tumors. Our data suggest that this family of transcription factors serves as a feedback mechanism to maintain homeostasis to growth factors receptor signaling. As a result, AP-2 transcription factors serve as a natural mechanism to cause subsequent therapeutic resistance without addition of genetic alterations. Further investigation is needed to determine the role of AP-2 transcription factors in acquired cetuximab resistance.
Citation Format: Luciane T. Kagohara, Genevieve Stein-O'Brien, Sijia Li, Manjusha Thakar, Ruchira Ranaweera, Michael Considine, Joseph A. Califano, Christine H. Chung, Daria Gaykalova, Elana J. Fertig. Time course analysis of gene expression and epigenetic interactions in acquired cetuximab resistance in head and neck squamous cell carcinoma [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 86. doi:10.1158/1538-7445.AM2017-86
Collapse
Affiliation(s)
| | | | - Sijia Li
- 1Johns Hopkins University, Baltimore, MD
| | | | | | | | | | | | | | | |
Collapse
|
13
|
Shete A, Suryawanshi P, Godbole S, Pawar J, Paranjape R, Thakar M. HIV-infected CD4+ T Cells Use T-bet-dependent Pathway for Production of IL-10 Upon Antigen Recognition. Scand J Immunol 2016; 83:288-96. [PMID: 27028319 DOI: 10.1111/sji.12422] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 02/15/2016] [Indexed: 01/11/2023]
Abstract
Interleukin (IL)-10 has been implicated in persistence of pathogens in a number of chronic infections. Infected CD4+ cells upon reactivation with HIV antigens were also shown to produce IL-10, which might contribute to their persistence. Hence, it is crucial to determine mechanisms regulating IL-10 production after activation with HIV antigens for devising effective blocking strategies. In this study, ERK-, T-bet- and FoxP3-dependent pathways were evaluated for their possible roles in IL-10 production by infected CD4+ cells after reactivation with HIV Env. Intracellular and secreted IL-10 levels were determined by flow cytometry and Bioplex assay after treating PBMCs with PD98059, tipifarnib and cyclosporin A for blocking of ERK-, T-bet-and FoxP3-dependent pathways, respectively. Baseline levels of T-bet, pERK were higher in P24+ CD4+ cells as compared to uninfected CD4+ cells, which increased further after activation with Env. Inhibition of T-bet resulted in 2.3-fold reduction of IL-10 expression whereas ERK and FoxP3 inhibition failed to cause suppression of IL-10 expression. Conversely, IL-10 secreted by PBMCs was inhibited maximally after ERK inhibition suggesting its role in regulation of cytokine secretory pathway. IFN-γ was found to be suppressed after treatment with inhibitors of all these pathways. Thus, the study highlighted need for IL-10 blockade along with the use of antigens for therapeutic vaccinations or latency reversal and identified the T-bet-dependent pathway as an important pathway regulating IL-10 production by infected CD4+ cells. However, simultaneous blockade of IFN-γ precludes use of inhibitor of this pathway as an IL-10 blocking strategy.
Collapse
Affiliation(s)
- A Shete
- National AIDS Research Institute, Pune, India
| | | | - S Godbole
- National AIDS Research Institute, Pune, India
| | - J Pawar
- National AIDS Research Institute, Pune, India
| | - R Paranjape
- National AIDS Research Institute, Pune, India
| | - M Thakar
- National AIDS Research Institute, Pune, India
| |
Collapse
|
14
|
Fertig EJ, Ozawa H, Thakar M, Howard J, Krigsfeld G, Favorov AV, Gaykalova DA, Ochs MF, Chung CH. Abstract 777: The CoGAPS matrix factorization algorithm infers feedback mechanisms from therapeutic inhibition of EGFR that increases expression of growth factor receptors. Cancer Res 2016. [DOI: 10.1158/1538-7445.am2016-777] [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
Next generation sequencing technologies enable precise personalized medicine. Thus, patients with oncogene driven tumors are currently treated with targeted therapeutics such as EGFR inhibitors. However, drug interactions with other activated signaling pathways in treated tumors often alter predicted therapeutic response. Therefore, bioinformatics algorithms are needed to infer unanticipated molecular interactions from anticipated molecular response to targeted therapeutics in diverse genetic backgrounds. To model heterogeneous genetic backgrounds in HNSCC, we use HaCaT cells with forced overexpression of EGFR, HRAS, and PIK3CA. Previously, the CoGAPS matrix factorization algorithm was shown to infer the specific signaling pathways that were activated in these HaCaT knock-in constructs from gene expression data. In this study, we evaluated whether CoGAPS could also delineate unanticipated signaling changes from anticipated cellular signaling response caused by targeted therapeutic in diverse genetic backgrounds. To delineate these signaling responses, we measured gene expression after treating the modified HaCaT cells with three EGFR targeted agents (gefitinib, cetuximab and afatinib) for 24 hours. The CoGAPS matrix factorization algorithm distinguished a gene expression signature associated with the anticipated silencing of the EGFR network and a signature associated with unanticipated transcriptional feedback in HaCaT constructs that were sensitive to EGFR inhibitors. Notably, the feedback signature showed that EGFR gene expression itself increased in cells that were responsive to EGFR inhibitors. The CoGAPS algorithm further associated such feedback with increased expression of several growth factor receptors by the AP-2 family of transcription factors. Once transcribed, these growth factor receptors may ultimately compensate for EGFR inhibition in these sensitive cells. Our data suggest, that CoGAPS gene expression signatures delineate on target and feedback effects of drugs related to therapeutic sensitivity in diverse genetic backgrounds.
Citation Format: Elana J. Fertig, Hiroyuki Ozawa, Manjusha Thakar, Jason Howard, Gabriel Krigsfeld, Alexander V. Favorov, Daria A. Gaykalova, Michael F. Ochs, Christine H. Chung. The CoGAPS matrix factorization algorithm infers feedback mechanisms from therapeutic inhibition of EGFR that increases expression of growth factor receptors. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 777.
Collapse
|
15
|
Cheng H, Fertig EJ, Ozawa H, Hatakeyama H, Howard JD, Perez J, Considine M, Thakar M, Ranaweera R, Krigsfeld G, Chung CH. Decreased SMAD4 expression is associated with induction of epithelial-to-mesenchymal transition and cetuximab resistance in head and neck squamous cell carcinoma. Cancer Biol Ther 2015; 16:1252-8. [PMID: 26046389 DOI: 10.1080/15384047.2015.1056418] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [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: 01/26/2023] Open
Abstract
Epidermal growth factor receptor (EGFR) is frequently overexpressed in head and neck squamous cell carcinoma (HNSCC) and cetuximab, a monoclonal antibody targeting this receptor, is widely used to treat these patients. In the following investigation, we examined the role of SMAD4 down-regulation in mediating epithelial-to-mesenchymal transition (EMT) and cetuximab resistance in HNSCC. We determined that SMAD4 downregulation was significantly associated with increased cell motility, increased expression of vimentin, and cetuximab resistance in HNSCC cell lines. In the HNSCC genomic dataset obtained from The Cancer Genome Atlas, SMAD4 was altered in 20/279 (7%) of HNSCC via homozygous deletion, and nonsense, missense, and silent mutations. When SMAD4 expression was compared with respect to human papillomavirus (HPV) status, HPV-positive tumors had higher expression compared to HPV-negative tumors. Furthermore, higher SMAD4 expression also correlated with higher CDKN2A (p16) expression. Our data suggest that SMAD4 down-regulation plays an important role in the induction of EMT and cetuximab resistance. Patients with higher SMAD4 expression may benefit from cetuximab use in the clinic.
Collapse
Key Words
- CDKN2A, cyclin-dependent kinase Inhibitor 2A
- CTX, cetuximab
- EGFR, epidermal growth factor receptor
- EMT, epithelial-to-msenchymal transition
- FDR, false delivery rate
- HB-EGF, heparin-binding EGF-like growth factor
- HNSCC, head and neck squamous cell carcinoma
- HPV, human papillomavirus
- KD, knocked-down
- RPPA, reverse phase protein arrays
- RSEM, RNA-Seq by Expectation Maximization
- SMAD4
- SMAD4, mothers against decapentaplegic homolog 4
- TCGA, The Cancer Genome Atlas
- cetuximab
- epithelial-to-mesenchymal transition
- head and neck squamous cell carcinoma
- mIR, microRNA
- qRT-PCR, quantitative real-time polymerase chain reaction
- shRNA, small hairpin RNA
Collapse
Affiliation(s)
- Haixia Cheng
- a Department of Oncology , Johns Hopkins Medical Institutions , Baltimore , MD USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Kang H, Thakar M, Sen R, Chung CH. Antitumor effect of IMGN289, an anti-EGFR antibody-drug conjugate (ADC), in preclinical models of head and neck squamous cell carcinomas (HNSCC). J Clin Oncol 2014. [DOI: 10.1200/jco.2014.32.15_suppl.e17046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Hyunseok Kang
- The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Manjusha Thakar
- The Johns Hopkins University School of Medicine, Baltimore, MD
| | - Rupashree Sen
- The Johns Hopkins University School of Medicine, Baltimore, MD
| | | |
Collapse
|
17
|
Fandy TE, Jiemjit A, Thakar M, Rhoden P, Suarez L, Gore SD. Decitabine induces delayed reactive oxygen species (ROS) accumulation in leukemia cells and induces the expression of ROS generating enzymes. Clin Cancer Res 2014; 20:1249-58. [PMID: 24423613 DOI: 10.1158/1078-0432.ccr-13-1453] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
PURPOSE Azanucleoside DNA methyltransferase (DNMT) inhibitors are currently approved by the U.S. Food and Drug Administration for treatment of myelodysplastic syndrome. The relative contributions of DNMT inhibition and other off-target effects to their clinical efficacy remain unclear. Data correlating DNA methylation reversal and clinical response have been conflicting. Consequently, it is necessary to investigate so-called off-target effects and their impact on cell survival and differentiation. EXPERIMENTAL DESIGN Flow cytometry was used for cell cycle, apoptosis, and reactive oxygen species (ROS) accumulation analysis. Gene expression analysis was performed using real-time PCR. DNA methylation was detected by methylation-specific PCR. Mitochondrial membrane potential was analyzed using JC-1 dye staining. Western blotting was used for quantitative protein expression analysis. RESULTS 5-Aza-2'-deoxycytidine (DAC) induced cell-cycle arrest and apoptosis in leukemia cells. p53 expression was dispensable for DAC-induced apoptosis. DAC induced delayed ROS accumulation in leukemia cells but not in solid tumor cells and p53 expression was dispensable for ROS increase. ROS increase was deoxycytidine kinase dependent, indicating that incorporation of DAC into nuclear DNA is required for ROS generation. ROS accumulation by DAC was caspase-independent and mediated the dissipation of the mitochondrial membrane potential. Concordantly, ROS scavengers diminished DAC-induced apoptosis. DAC induced the expression of different NADPH oxidase isoforms and upregulated Nox4 protein expression in an ATM-dependent manner, indicating the involvement of DNA damage signaling in Nox4 upregulation. CONCLUSION These data highlight the importance of mechanisms other than DNA cytosine demethylation in modulating gene expression and suggest investigating the relevance of ROS accumulation to the clinical activity of DAC.
Collapse
Affiliation(s)
- Tamer E Fandy
- Authors' Affiliations: Department of Pharmaceutical Sciences, Albany College of Pharmacy, Colchester, Vermont; and The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, Maryland
| | | | | | | | | | | |
Collapse
|
18
|
Prebet T, Sun Z, Carraway H, Thakar M, Greenberg P, Czader M, Paietta E, Juckett M, Erba H, Gabrilove J, Tallman M, Herman J, Gore S. 299 SOCS1 methylation and azacitidine response in high risk myelodysplasia (MDS) and secondary acute myeloid leukemia (AML). Leuk Res 2011. [DOI: 10.1016/s0145-2126(11)70301-0] [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: 10/18/2022]
|
19
|
Tripathy S, Anand A, Inamdar V, Manoj M, Khillare K, Datye A, Iyer R, Kanoj D, Thakar M, Kale V, Pereira M, Risbud A. Clinical response of newly diagnosed HIV seropositive & seronegative pulmonary tuberculosis patients with the RNTCP Short Course regimen in Pune, India. Indian J Med Res 2011; 133:521-8. [PMID: 21623038 PMCID: PMC3121284] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND & OBJECTIVES In the Revised National Tuberculosis Control Programme (RNTCP) in India prior to 2005, TB patients were offered standard DOTS regimens without knowledge of HIV status. Consequently such patients did not receive anti-retroviral therapy (ART) and the influence of concomitant HIV infection on the outcome of anti-tuberculosis treatment remained undetermined. This study was conducted to determine the results of treatment of HIV seropositive pulmonary tuberculosis patients with the RNTCP (DOTS) regimens under the programme in comparison with HIV negative patients prior to the availability of free ART in India. METHODS Between September 2000 and July 2006, 283 newly diagnosed pulmonary TB patients were enrolled in the study at the TB Outpatient Department at the Talera Hospital in the Pimpri Chinchwad Municipal Corporation area at Pune (Maharashtra): they included 121 HIV seropositive and 162 HIV seronegative patients. They were treated for tuberculosis as per the RNTCP in India. This study was predominantly conducted in the period before the free ART become available in Pune. RESULTS At the end of 6 months of anti-TB treatment, 62 per cent of the HIV seropositive and 92 per cent of the HIV negative smear negative patients completed treatment and were asymptomatic; among smear positive patients, 70 per cent of the HIV-seropositive and 81 per cent of HIV seronegative pulmonary TB patients were cured. Considering the results in the smear positive and smear negative cases together, treatment success rates were substantially lower in HIV positive patients than in HIV negative patients, (66% vs 85%). Further, 29 per cent of HIV seropositive and 1 per cent of the HIV seronegative patients expired during treatment. During the entire period of 30 months, including 6 months of treatment and 24 months of follow up, 61 (51%) of 121 HIV positive patients died; correspondingly there were 6 (4%) deaths among HIV negative patients. INTERPRETATION & CONCLUSIONS The HIV seropositive TB patients responded poorly to the RNTCP regimens as evidenced by lower success rates with chemotherapy and high mortality rates during treatment and follow up. There is a need to streamline the identification and management of HIV associated TB patients in the programme with provision of ART to achieve high cure rates for TB, reducing mortality rates and ensuring a better quality of life.
Collapse
Affiliation(s)
- S. Tripathy
- National AIDS Research Institute (ICMR), Pune, India,Reprint requests: Dr S. Tripathy, National AIDS Research Institute, 73 G Block, MIDC, Bhosari, Pune 411 026, India e-mail:
| | - A. Anand
- National AIDS Research Institute (ICMR), Pune, India
| | - V. Inamdar
- National AIDS Research Institute (ICMR), Pune, India
| | | | | | | | - R. Iyer
- Pimpri Chichwad Municipal Corporation, Pune, India
| | | | - M. Thakar
- National AIDS Research Institute (ICMR), Pune, India
| | - V. Kale
- National AIDS Research Institute (ICMR), Pune, India
| | - M. Pereira
- National AIDS Research Institute (ICMR), Pune, India
| | - A.R. Risbud
- National AIDS Research Institute (ICMR), Pune, India
| |
Collapse
|
20
|
Goldblum SE, Rai U, Tripathi A, Thakar M, De Leo L, Di Toro N, Not T, Ramachandran R, Puche AC, Hollenberg MD, Fasano A. The active Zot domain (aa 288-293) increases ZO-1 and myosin 1C serine/threonine phosphorylation, alters interaction between ZO-1 and its binding partners, and induces tight junction disassembly through proteinase activated receptor 2 activation. FASEB J 2011; 25:144-58. [PMID: 20852064 PMCID: PMC3005425 DOI: 10.1096/fj.10-158972] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [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: 04/22/2010] [Accepted: 09/02/2010] [Indexed: 01/12/2023]
Abstract
Vibrio cholerae-derived zonula occludins toxin (Zot) is a multifunctional protein that reversibly disassembles intestinal tight junctions (tjs). Zot structure-function analysis has mapped this activity to aa 288-293, named AT1002. AT1002 reduced transepithelial electrical resistance across rat small intestine, ex vivo, as did Zot and its processed mature form, ΔG. AT1002 increased in vivo permeability to sugar tracers, whereas scrambled control peptides did not. Binding and barrier assays in proteinase activated receptor (PAR)(2)-expressing and PAR(2)-null cells established AT1002 activity to be PAR(2) dependent. Coincident with the increased intestinal permeability, confocal microscopy of AT1002-exposed rat intestinal IEC6 cells revealed displacement of ZO-1 and occludin from intercellular boundaries. In coimmunoprecipitation assays, AT1002 decreased ZO-1-occludin and ZO-1-claudin 1 interactions coincident with PKCα-dependent ZO-1 serine/threonine phosphorylation. Further, AT1002 increased serine phosphorylation of myosin 1C and, at the same time, transiently diminished its association with ZO-1. The COOH-terminal domain of ZO-1 was required for its association with myosin 1C. These data indicate that the NH(2)-terminal portion of active Zot contains a PAR(2)-activating motif, FCIGRL, that increases PKCα-dependent ZO-1 and myosin 1C serine/threonine phosphorylation. These modifications provoke selective disengagement of ZO-1 from its binding partners, occludin, claudin 1, and myosin 1C, coincident with opening of tjs.
Collapse
Affiliation(s)
| | - Usha Rai
- Mucosal Biology Research Center and
| | | | | | - Luigina De Leo
- Department of Reproductive and Development Science, University of Trieste, Trieste, Italy
- Children Hospital Istituto di Recovero e Cura a Carattere Scientifico Burlo Garofolo, Trieste, Italy; and
| | - Nicola Di Toro
- Department of Reproductive and Development Science, University of Trieste, Trieste, Italy
- Children Hospital Istituto di Recovero e Cura a Carattere Scientifico Burlo Garofolo, Trieste, Italy; and
| | - Tarcisio Not
- Department of Reproductive and Development Science, University of Trieste, Trieste, Italy
- Children Hospital Istituto di Recovero e Cura a Carattere Scientifico Burlo Garofolo, Trieste, Italy; and
| | - Rithwik Ramachandran
- Department of Pharmacology and Therapeutics and Department of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Adam C. Puche
- Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Morley D. Hollenberg
- Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | | |
Collapse
|
21
|
Thakar M, Sah S, McKechnie A. P115 The use of a daily ‘casualty clinic’ for managing paediatric facial lacerations. Br J Oral Maxillofac Surg 2010. [DOI: 10.1016/s0266-4356(10)60204-5] [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: 10/19/2022]
|
22
|
Kumar V, Ghosh B, Kaul U, Thakar M, Goel N. Posterior polar cataract surgery: a posterior segment approach. Eye (Lond) 2008; 23:1879; author reply 1879. [PMID: 18989342 DOI: 10.1038/eye.2008.347] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
|
23
|
Drago S, El Asmar R, Di Pierro M, Grazia Clemente M, Tripathi A, Sapone A, Thakar M, Iacono G, Carroccio A, D'Agate C, Not T, Zampini L, Catassi C, Fasano A. Gliadin, zonulin and gut permeability: Effects on celiac and non-celiac intestinal mucosa and intestinal cell lines. Scand J Gastroenterol 2006; 41:408-19. [PMID: 16635908 DOI: 10.1080/00365520500235334] [Citation(s) in RCA: 316] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE Little is known about the interaction of gliadin with intestinal epithelial cells and the mechanism(s) through which gliadin crosses the intestinal epithelial barrier. We investigated whether gliadin has any immediate effect on zonulin release and signaling. MATERIAL AND METHODS Both ex vivo human small intestines and intestinal cell monolayers were exposed to gliadin, and zonulin release and changes in paracellular permeability were monitored in the presence and absence of zonulin antagonism. Zonulin binding, cytoskeletal rearrangement, and zonula occludens-1 (ZO-1) redistribution were evaluated by immunofluorescence microscopy. Tight junction occludin and ZO-1 gene expression was evaluated by real-time polymerase chain reaction (PCR). RESULTS When exposed to gliadin, zonulin receptor-positive IEC6 and Caco2 cells released zonulin in the cell medium with subsequent zonulin binding to the cell surface, rearrangement of the cell cytoskeleton, loss of occludin-ZO1 protein-protein interaction, and increased monolayer permeability. Pretreatment with the zonulin antagonist FZI/0 blocked these changes without affecting zonulin release. When exposed to luminal gliadin, intestinal biopsies from celiac patients in remission expressed a sustained luminal zonulin release and increase in intestinal permeability that was blocked by FZI/0 pretreatment. Conversely, biopsies from non-celiac patients demonstrated a limited, transient zonulin release which was paralleled by an increase in intestinal permeability that never reached the level of permeability seen in celiac disease (CD) tissues. Chronic gliadin exposure caused down-regulation of both ZO-1 and occludin gene expression. CONCLUSIONS Based on our results, we concluded that gliadin activates zonulin signaling irrespective of the genetic expression of autoimmunity, leading to increased intestinal permeability to macromolecules.
Collapse
Affiliation(s)
- Sandro Drago
- Mucosal Biology Research Center, Center for Celiac Research and Division of Pediatric Gastroenterology and Nutrition, University of Maryland, School of Medicine, Baltimore, MD 21201, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Abstract
Delta G (DeltaG) is the biologically active fragment of Zonula Occludens Toxin (Zot), an absorption enhancer, that reversibly opens the tight junctions of epithelial and endothelial cells in the small intestine and brain. This study evaluates the possible use of DeltaG in enhancing the oral bioavailability of macromolecules using large paracellular markers as model agents. The transport of [(14)C]Inulin and [(14)C]PEG4000 was evaluated across Caco-2 cells with DeltaG (0, 100, 180 microg/ml). The apparent permeability coefficients (P(app)) were calculated. The in vitro toxicity of DeltaG (180 microg/ml) was assessed. Sprague Dawley rats were dosed intraduodenally (ID) with the following treatments: [(14)C]Inulin or [(14)C]PEG4000 (30 microci/kg) w/o DeltaG (720 microg/kg)/protease inhibitors (PI). Blood was collected and plasma was analyzed for radioactivity. DeltaG (180 microg/ml) increased [(14)C]Inulin and [(14)C]PEG4000 P(app) by 82.6 and 24.4%, respectively, without any toxicity. After ID administration with DeltaG/PI, C(max) and AUC were significantly (p < 0.05) increased for both Inulin and PEG4000. However, Inulin displayed greater enhancement ratios in vitro and in vivo. This study suggests that DeltaG may be used to enhance the oral bioavailability of macromolecules (e.g., proteins) after coadministration through modulation of paracellular transport.
Collapse
Affiliation(s)
- Noha N Salama
- Pharmacokinetics-Biopharmaceutics Laboratory, Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland at Baltimore, 20 Penn Street, Baltimore, Maryland 21201, USA
| | | | | | | |
Collapse
|
25
|
Salama NN, Fasano A, Thakar M, Eddington ND. The impact of DeltaG on the oral bioavailability of low bioavailable therapeutic agents. J Pharmacol Exp Ther 2004; 312:199-205. [PMID: 15448170 DOI: 10.1124/jpet.104.073205] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Low oral bioavailability continues to drive research toward identifying novel approaches to enhance drug delivery. Over the past few years, emphasis on the use of absorption enhancers has been overwhelming despite their major adverse effects. Zonula occludens toxin (Zot) was recently established as a safe and effective absorption enhancer, reversibly opening the tight junctions for hydrophilic markers and hydrophobic drugs across the small intestine and the blood brain barrier. DeltaG, the biologically active fragment of Zot, was isolated and shown to increase the in vitro transport and in vivo absorption of paracellular markers. The objective of this study was to examine the effect of DeltaG on the oral bioavailability of low bioavailable therapeutic agents. Jugular vein cannulated Sprague-Dawley rats were randomly assigned to receive the following treatments intraduodenally (ID): [(3)H]cyclosporin A, [(3)H]ritonavir, [(3)H]saquinavir, or [(3)H]acyclovir at (120 microCi/kg) alone, with protease inhibitors (PIs), or with DeltaG (720 microg/kg)/PI. Serial blood samples were collected, and plasma was analyzed for radioactivity. After ID administration with DeltaG/PI, C(max) significantly (p < 0.05) increased over a range of 197 to 5700%, whereas area under the plasma concentration time curve displayed significant increases extending over a range of 123.8 to 4990.3% for the investigated drugs. DeltaG significantly increased the in vivo oral absorption of some low bioavailable drugs in the presence of PI. This study suggests that DeltaG-mediated tight junction modulation, combined with metabolic protection, may be used to enhance the low oral bioavailability of certain drugs when administered concurrently.
Collapse
Affiliation(s)
- Noha N Salama
- Pharmacokinetics-Biopharmaceutics Laboratory, Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland at Baltimore, 20 Penn Street, Baltimore, MD 21201, USA
| | | | | | | |
Collapse
|
26
|
Manocha M, Chitralekha KT, Thakar M, Shashikiran D, Paranjape RS, Rao DN. Comparing modified and plain peptide linked enzyme immunosorbent assay (ELISA) for detection of human immunodeficiency virus type-1 (HIV-1) and type-2 (HIV-2) antibodies. Immunol Lett 2003; 85:275-8. [PMID: 12663143 DOI: 10.1016/s0165-2478(02)00257-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Serological diagnosis of human immunodeficiency virus (HIV) based on detection of HIV antibodies is one of the easiest, cheapest and simplest assay. Synthetic peptides corresponding to immunodominant regions of envelope glycoprotein (gp41, V3 loop for HIV-1 and gp36 for HIV-2) were used in the present study, to detect the anti-HIV antibodies in sera of Sexually Transmitted Diseases (STD), Tuberculosis (TB), Anti-Natal Care (ANC) patients. About 550 serum samples were tested using Enzyme Linked Immunosorbent Assay (ELISA) technique. The human sera positive for antibody to HIV-1 and HIV-2, reacted to different degrees with these peptides when used as a plain peptide with or without CGG motif/biotin motif at the amino terminus. The selected sequences are of Indian strain with 'C' serotype. The results showed a 100% sensitivity and specificity for V3 loop peptide and 98% sensitivity and specificity for gp41 peptide containing CGG moiety while the plain peptides showed similar sensitivities but low specificity's, i.e. 98% for V3 loop peptide and 42% for gp41 peptide when reacted with HIV-1 positive sera. The presence of biotin at the amino terminus did not provide any beneficial effect in increasing the sensitivity although the specificity was enhanced for both the peptide sequences, i.e. gp41 and V3 loop peptide. Furthermore, the gp36 peptide containing CGG moiety detected the HIV-2 sera with 100% sensitivity and 98% specificity while the sensitivity and specificity of gp36 plain peptide was reduced to 98 and 90%. Thus the study overall highlighted the importance of synthetic peptides containing CGG moiety as a capture antigen in detecting both HIV-1 & 2 sera using an indigenously built ELISA system which is simple, cheap, sensitive and cost effective for rural areas.
Collapse
Affiliation(s)
- M Manocha
- Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, 110029, New Delhi, India
| | | | | | | | | | | |
Collapse
|
27
|
Toretsky JA, Steinberg SM, Thakar M, Counts D, Pironis B, Parente C, Eskenazi A, Helman L, Wexler LH. Insulin-like growth factor type 1 (IGF-1) and IGF binding protein-3 in patients with Ewing sarcoma family of tumors. Cancer 2001; 92:2941-7. [PMID: 11753970 DOI: 10.1002/1097-0142(20011201)92:11<2941::aid-cncr10072>3.0.co;2-c] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
BACKGROUND Ewing sarcoma family of tumors (ESFTs) are the second most common bone tumor, that most often affects persons ages 3-40 years. The ESFTs rely on signaling through the insulin-like growth factor-1 receptor (IGF-1R) for growth and transformation. The current studies were performed to determine the levels of IGF-1 and IGF binding protein-3 (IGFBP-3) in patients with ESFT. The authors then performed an exploratory analysis to evaluate whether IGF parameters could differentiate event free or overall survival in ESFT patients. METHODS The authors measured serum levels of IGF-1 and IGFBP-3 by using a radioimmunoassay from 111 patients with ESFT with a median follow-up of 13 years from diagnosis. RESULTS The IGF-1 levels were lower among patients with metastatic disease to the bones or the bone marrow compared with patients without metastasis to these sites (p2 = 0.021 and 0.0038, respectively). IGFBP-3 is known to sequester IGF-1; the ratios of IGFBP-3 to IGF-1 were evaluated. Patients with metastatic disease to any site had higher IGFBP-3 to IGF-1 ratios than patients with localized disease (p2 = 0.0067). There was a trend toward increased survival in patients with localized disease who had high IGFBP-3 to IGF-1 levels. Metastatic patients showed a similar trend. CONCLUSIONS Levels of IGF-1 and IGFBP-3 in ESFT patients can identify patients with the most widespread disease. The IGFBP-3 to IGF-1 ratio in patients with either localized or metastatic disease identified patients with a trend toward increased survival. Further prospective evaluation with higher patient numbers might show a prognostic role for the IGFBP-3 to IGF-1 ratio in patients with ESFT.
Collapse
Affiliation(s)
- J A Toretsky
- Department of Pediatrics, University of Maryland, Baltimore, Maryland, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Toretsky JA, Thakar M, Eskenazi AE, Frantz CN. Phosphoinositide 3-hydroxide kinase blockade enhances apoptosis in the Ewing's sarcoma family of tumors. Cancer Res 1999; 59:5745-50. [PMID: 10582694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Ewing's sarcoma family of tumors (ESFTs) affects patients between the ages of 3 and 40 years, with most cases occurring in the second decade of life. These tumors contain a characteristic translocation, t(11;22), that produces a unique fusion protein, EWS/FLI-1. EWS/FLI-1 transforms mouse fibroblasts; this transformation requires intact EWS and FLI-1 domains as well as the insulin-like growth factor-I receptor (IGF-IR). The IGF-IR is a well-described transmembrane tyrosine kinase receptor that modulates transformation, cell growth, and survival. IGF-IR survival signaling is mediated through the downstream activation of phosphoinositide 3-OH kinase (PI 3-K) and Akt. Apoptosis, programmed cell death, progresses from a central death signal to a caspase cascade, including activation of caspase-3. Because the IGF-IR has been shown to play a role in the transformation and growth of ESFTs, we wanted to determine the role of downstream molecules in the cellular response to doxorubicin treatment. Doxorubicin increased caspase-3 activity in two ESFT cell lines, TC-32 and TC-71. Concomitant treatment of the doxorubicin-treated cells with IGF-I reduced caspase-3 activity 8-fold in TC-32 and 4-fold in TC-71. To determine whether PI 3-K has a role in IGF-I-mediated survival in ESFTs, PI 3-K was then inhibited with wortmannin and LY294002. Doxorubicin treatment reduced cell number and enhanced apoptosis in PI 3-K inhibited cells compared with noninhibited cells. Akt, a serine/threonine kinase activated downstream of PI 3-K, was investigated to determine whether its constitutive activation would render ESFT cells more resistant to doxorubicin. A constitutively activated Akt was stably transfected into ESFT and those cells with high levels of expression demonstrated increased resistance to doxorubicin-induced caspase-3 activation. These results indicate that ESFT cell lines use an IGF-IR initiated signaling pathway through PI 3-K and Akt for survival when treated with doxorubicin.
Collapse
Affiliation(s)
- J A Toretsky
- Department of Pediatrics, University of Maryland, Baltimore 21201, USA.
| | | | | | | |
Collapse
|
29
|
Kunte A, Misra V, Paranjape R, Mansukhani N, Padbidri V, Gonjari S, Kakrani V, Thakar M, Mehendale S. HIV seroprevalence & awareness about AIDS among pregnant women in rural areas of Pune district, Maharashtra, India. Indian J Med Res 1999; 110:115-22. [PMID: 10645097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
The present unlinked anonymous study was done among sexually active rural women to assess the extent of spread of HIV and its awareness. Peripheral blood samples were collected on filter paper strips from 1251 pregnant women residing in villages in three Primary Health Centres in Pune district of Maharashtra. Elutes were tested for HIV antibodies in two different ELISA systems. Awareness on HIV/AIDS was assessed using a structured questionnaire. Fifteen (1.2%) samples were detected to be HIV seropositive. HIV seroprevalence was significantly higher among villages situated close to highways (P < 0.025). Majority (> 95%) of the participating women were housewives. Although 70 per cent were aware of the existence of AIDS, only 33 per cent knew about all the main modes of HIV transmission. Their main sources of information on AIDS were health camps, health workers (70%) and television (45%). Awareness was associated with higher level of literacy (P < 0.001). Many women had misconceptions about the modes of spread of HIV. Greater emphasis needs to be placed on instituting long-term and sustainable strategies to create awareness among young couples with an emphasis on involvement of health workers in rural areas.
Collapse
Affiliation(s)
- A Kunte
- Bharati Vidyapeeth Medical College, Pune
| | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Souza RF, Wang S, Thakar M, Smolinski KN, Yin J, Zou TT, Kong D, Abraham JM, Toretsky JA, Meltzer SJ. Expression of the wild-type insulin-like growth factor II receptor gene suppresses growth and causes death in colorectal carcinoma cells. Oncogene 1999; 18:4063-8. [PMID: 10435587 DOI: 10.1038/sj.onc.1202768] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The insulin-like growth factor II receptor (IGFIIR) has been implicated as a tumor suppressor gene in human malignancy. Frequent mutation, loss of heterozygosity, and microsatellite instability (MSI) directly affecting the IGFIIR gene have been reported in several primary human tumor types. However, to our knowledge, dynamic functional evidence of a growth-suppressive role for IGFIIR has not yet been provided. We identified one MSI-positive colorectal carcinoma cell line, SW48, with monoallelic mutation in IGFIIR identical to that seen in primary colorectal carcinomas. A zinc-inducible construct containing the wild-type IGFIIR cDNA was stably transfected into SW48 cells. Growth rate and apoptosis were compared between zinc-treated, untreated, and untransfected cells. A twofold increase in IGFIIR protein expression was detected after zinc treatment in discrete clonal isolates of transfected SW48 cells. Moreover, zinc induction of exogenous wild-type IGFIIR expression reproducibly decreased growth rate and increased apoptosis. These data prove that wild-type IGFIIR functions as a growth suppressor gene in colorectal cancer cells and provide dynamic in vitro functional support for the hypothesis that IGFIIR is a human growth suppressor gene.
Collapse
Affiliation(s)
- R F Souza
- Department of Medicine, Dallas VA Medical Center and University of Texas-Southwestern Medical School, 75216, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Abstract
A case of orbitral cellulitis following dental extraction is described. Orbital extension of infection occurred via the retromaxillary infra-temporal fossa, which is an unusual feature.
Collapse
Affiliation(s)
- M Thakar
- Department of Ophthalmology, Rohtak Medical College and Hospital, Haryana, India
| | | |
Collapse
|
32
|
Abstract
A 12-year-old girl with fungal keratitis following injury with a vegetable foreign body was successfully treated with oral fluconazole, a new antifungal agent. The infection resolved completely with good visual recovery. Fluconazole was well tolerated systemically.
Collapse
|
33
|
Abstract
The thermal stability of T7 DNA polymerase and pGEM4Z plasmid DNA in the presence and absence of the osmolyte N-methylglycine (sarcosine) was determined by means of UV spectroscopy. The decrease in melting temperature observed upon addition of sarcosine to solutions containing the plasmid DNA is linear with the concentration of sarcosine present. The enthalpy of the transition is also linear in its relationship to the melting temperature, and the entropy of the transition is linear in the natural log of the melting temperature. The slopes of both the entropic and enthalpic plots are equal. Destabilization of the plasmid DNA is observed to be entropically driven. The melting temperature of the T7 DNA polymerase complex is increased from 41 degrees C by addition of sarcosine to the solution. The relationship between the amount of sarcosine added and the melting temperature is linear, with a temperature of 61 degrees C observed for a 6 M solution. No clear trend of the effect of sarcosine on the enthalpy or entropy of the transitions could be observed.
Collapse
Affiliation(s)
- M Thakar
- Department of Biochemistry, Ohio State University, Columbus 43210
| | | | | |
Collapse
|
34
|
Sachdev MS, Honavar SG, Thakar M. Diagnostic tests for corneal diseases. Indian J Ophthalmol 1994; 42:89-99. [PMID: 7927639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Affiliation(s)
- M S Sachdev
- Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi
| | | | | |
Collapse
|
35
|
Raaphorst GP, Bussey A, Thakar M, Bichay T, Ng CE. Postirradiation exposure to hypotonic saline shows normal damage processing in radiation-sensitive cell lines. Int J Radiat Biol 1993; 64:593-600. [PMID: 7902399 DOI: 10.1080/09553009314551811] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Three pairs of cell lines (one human and two Chinese hamster ovary (CHO) cell lines) each comprising a cell line with a normal radiation response and a radiation-sensitive mutant, were evaluated for recovery of potentially lethal damage (PLDR) and recovery of sublethal damage (SLDR). In all cases, the normal cell lines (GM1522, human; AA8-4 and K1, CHO) exhibited capacity for PLDR and SLDR was also normal in the two CHO lines. For the mutants (GM3395, human AT; V3 and 5-11, CHO) there was no ability for PLDR and SLDR was also absent in the two CHO cell lines. Postirradiation exposure to hypotonic NaCl solutions resulted in fixation of radiation damage in all the cell lines. This form of damage is repaired if left unperturbed after irradiation. This shows that cells have a large capacity for repair of this form of damage which accounts for much greater changes in survival than those observed in conventional PLDR experiments. These data show that the mutant cell lines retained their capacity to repair the damage which was susceptible to postirradiation fixation by anisotonic salt solutions. In addition, initial (i.e. preirradiation) DNA polymerase activities were measured in the four CHO cell lines; they were not correlated to radiation sensitivity.
Collapse
|
36
|
Nandi J, Banerjee K, Thakar M, Bhavalkar V, Rodrigues J. Human immunodeficiency virus-1 infection in spouses of seropositive individuals. Natl Med J India 1993; 6:156-9. [PMID: 8401191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
BACKGROUND Unprotected sex can lead to transmission of the human immunodeficiency virus-1 (HIV-1) to the spouse of an infected individual. We studied the incidence of HIV-1 infection in the spouses of cases diagnosed to have HIV-1 infection by serology and the polymerase chain reaction (PCR). METHODS Blood samples collected from 9 index cases and their respective spouses were tested for HIV-1 infection by ELISA, Western blot (WB) and PCR as well as from 10 healthy individuals with no high-risk behaviour. DNA extracted from both plasma and peripheral blood mononuclear cells was amplified by PCR, using multiple primer pairs for distinct regions of the HIV-1 genome. Specificity of the PCR product was demonstrated by hybridization to an oligonucleotide probe. RESULTS All the index cases which were seropositive by ELISA and WB were also positive by PCR of plasma extracted DNA. Eight of the spouses were seronegative. Of these seven were positive by PCR--one spouse was negative by ELISA but showed a p55 band on WB and was positive by PCR. One spouse was negative by serology and PCR. The spouse belonging to the lone concordant couple was positive by serology and PCR. Except for one index case, PCR signals were obtainable only from DNA extracted from plasma but not from the DNA extracted from peripheral blood mononuclear cells. The control samples were negative by serology and PCR. CONCLUSION It is possible to detect HIV-1 infection by PCR using DNA extracted from plasma even when the individuals are negative by ELISA and WB. It can help in the early counselling of HIV infected persons and their spouses.
Collapse
Affiliation(s)
- J Nandi
- National Institute of Virology, Pune, Maharashtra, India
| | | | | | | | | |
Collapse
|
37
|
Abstract
Two pairs of Chinese hamster ovary cell lines, each comprising a parental normal-responding and a radiation-sensitive mutant, were tested for their X-radiation sensitivity, hyperthermia sensitivity and thermal radiosensitization. The relative radiation responses were similar to those already published in the literature, indicating that the mutant cell lines, V-3 and 5-11, were extremely sensitive to radiation while their parental strains (AA8-4 and K1) exhibited normal sensitivity. The hyperthermia response of V3 was the same as that of the parental cell line AA8-4; the thermal sensitivity of 5-11 was greater than that of its parental line K1 but this difference decreased at higher temperatures (greater than 43 degrees C). These data indicate that the hyperthermia response and its targets are probably not related to the mutation-causing radiation sensitivity in the two pairs of parent-mutant cell lines. When heat and radiation were combined, the thermal enhancement of radiation sensitivity for different heat treatments was the same or larger in the mutant than in the parental cell lines. The mutants are known to be deficient in potentially lethal damage repair (PLDR), sublethal damage repair (SLDR) and repair of double-stranded DNA breaks; however, these deficiencies did not impair thermal radiosensitization, indicating that thermal radiosensitization may not be through these pathways in these particular mutants. In addition, the parental cell lines exhibited a significant sequence dependence of thermal radiosensitization (i.e. whether heat was applied before or after irradiation) at low survival levels (10(-4); this sequence dependence was very small to absent in the mutant cell lines at these survival levels.
Collapse
|
38
|
Kulkarni S, Thakar M, Rodrigues J, Banerjee K. HIV-2 antibodies in serum samples from Maharashtra state. Indian J Med Res 1992; 95:213-5. [PMID: 1478722] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Two hundred serum samples were tested to detect the presence of HIV-2 infection in Maharashtra state. The serum samples were derived from various groups including those with high risk behaviour for HIV infection. All samples were tested by three combined HIV-1 and HIV-2 ELISA kits. The reactivity was confirmed by LiaTek HIV 1+2 immunoblot. The study confirmed that HIV-2 infection exists in Maharashtra, as 14 samples showed antibodies to HIV-2 and 14 showed antibodies to both HIV-1 and HIV-2. Antibodies to HIV-2 or HIV-1 and HIV-2 were detected mainly in persons with high risk behaviour.
Collapse
|
39
|
Thakar M, Rodrigues J, Athalye N, Banerjee K. Serum beta 2 microglobulin levels in HIV seropositive persons. Indian J Med Res 1992; 95:168-70. [PMID: 1398802] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
As beta 2 microglobulin (B2M) has been found to be elevated in immunological disorders and also in HIV infection, its levels were studied in 475 HIV seropositive, asymptomatic persons; 101 HIV seronegative persons from high risk groups for HIV and 99 healthy controls. The B2M levels in asymptomatic HIV seropositives are found to be significantly higher than healthy controls (1.0 mg/1 to 2.7 mg/1, P less than 0.001) and HIV seronegatives from high risk groups (1.1 mg/1 to 2.7 mg/1, P less than 0.001). Two hundred and thirty four (49.26%) seropositives showed increased levels of serum B2M. Thus, quantitative analysis of B2M may be useful as an early nonspecific marker of HIV infection and immune dysfunction. The prognostic value of B2M was assessed in a follow up study of 54 HIV seropositives in a 2 yr period. Within this period, B2M levels were found to be significantly increased in these subjects (1.2 mg/1 to 4.6 mg/1, P less than 0.001). Three of the subjects who showed high increase in the B2M levels, progressed to AIDS-related condition, whereas one progressed to persistent generalised lymphadenopathy. Thus, the rising levels of B2M appears to correlate well with disease progression.
Collapse
Affiliation(s)
- M Thakar
- National Institute of Virology, Pune
| | | | | | | |
Collapse
|
40
|
Thakar M, Rodrigues J, Randive S, Kulkarni S, Banerjee K. Circulating immune complexes in healthy, HIV-antibody positive subjects. Indian J Med Res 1991; 93:57-61. [PMID: 1906833] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The components of the circulating immune complexes (CICs) were characterised in asymptomatic HIV seropositive individuals. Forty four of 214 individuals (20.56%) showed the presence of CICs. Specific HIV anti-HIV CICs were detected in 33 of them (75%). The isotypic specificity of antibodies found to these CICs was measured. IgG and IgA immunoglobulin classes were detected in CICs.
Collapse
Affiliation(s)
- M Thakar
- National Institute of Virology, Pune
| | | | | | | | | |
Collapse
|
41
|
|