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Farouk M, Slibi DA, Abd El-Fattah ZM, Atallah M, El-Sherbiny MA, Hassan MA. Effect of SiO2 Addition on Chromium Transitions in Borate Glasses. Silicon 2021; 13:3003-3010. [DOI: 10.1007/s12633-020-00649-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 08/11/2020] [Indexed: 09/02/2023]
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2
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Slibi DA, Hassan MA, Abd El-Fattah ZM, Atallah M, El-Sherbiny MA, Farouk M. Optical transitions from hexavalent chromium in lithium-borate glasses. Opt Quant Electron 2021; 53:499. [DOI: 10.1007/s11082-021-03147-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Accepted: 07/24/2021] [Indexed: 09/02/2023]
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3
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Slibi D, Hassan M, El-fattah ZMA, Atallah M, El-sherbiny MA, Farouk M. Optical Transitions from Hexavalent Chromium in Lithium-Borate Glasses.. [DOI: 10.21203/rs.3.rs-307888/v1] [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] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Abstract
The melt-quenching technique was used to prepare a series of chromium-doped borate glasses with the composition xCr2O3 - (70-x) B2O3- 30 Li2O- (x = 0, 0.1, 0.2, 0.3 and 0.5 mol %). The low-doping level here employed allowed to unambiguously identify well-defined near-edge Cr6+ optical transitions, and to precisely determine the optical band gap of the borate glass host. Additional Cr3+ transitions were observed in the visible regime, rendering a strong modulation of the glass color, from colorless to dark greenish, with Cr content. Both Cr6+(after the charge transfer transformation into Cr5+) and Cr3+oxidation states and their variations with Cr doping were identified from electron spin resonance spectroscopy. All samples exhibit similar vibrational spectra dominated by BO3 and BO4 structural units, with the development of weak Cr6+ vibration with Cr doping. The present study provides structurally similar but optically active and tunable glass hosts suitable for various optical applications.
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Affiliation(s)
| | | | | | - M. Atallah
- Higher Technical Institute, 10th of Ramadan City
| | | | - M. Farouk
- Al-Azhar University Faculty of Science
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4
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Affiliation(s)
- Emily Ashkin
- Emily Ashkin and Michelle Atallah are Ph.D. candidates at Stanford University in Palo Alto, California. Send your career story to
| | - Michelle Atallah
- Emily Ashkin and Michelle Atallah are Ph.D. candidates at Stanford University in Palo Alto, California. Send your career story to
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5
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Salman AA, Shaaban HE, Atallah M, Yousef M, Ahmed RA, Ashoush O, Tourky M, Nafea MA, Elshafey MH, El-Ghobary M. Long-term outcome after endoscopic ligation of acute esophageal variceal bleeding in patients with liver cirrhosis. Acta Gastroenterol Belg 2020; 83:373-380. [PMID: 33094582] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Endoscopic variceal ligation (EVL) has been the standard treatment for acute variceal bleeding (AVB). However, reports of long-term prognosis after EVL are scarce. Therefore, the current work aimed to investigate the long-term outcome and prognostic modifiers of cirrhotic cases presented with acute esophageal variceal bleeding and managed with EVL. The current prospective work comprised primarily 276 consecutive grown-up cirrhotic cases presenting with AVB and managed with EVL. Two-hundred patients who completed the study till death or 3-year follow-up were enrolled in final analysis. The primary outcome measure was occurrence of rebleeding and all-cause mortality. By the end of follow up 56 patients (28%) developed rebleeding and 78 (39%) died. The independent factors associated with rebleeding were lacking follow up EVL (OR: 4.8, 95%CI: 1.9-12.2), BMI > 30 kg/m2 (OR: 0.-, 95%CI: 0.2-0.9), Child class C (OR: 3.8, 95%CI: 1.8-7.8), and grade IV varices (OR: 2.6, 95%CI: 1.3-5.3). The independent factors associated with mortality were: Age > 65 years (OR: 32.4, 95%CI: 8.7-120.3), rebleeding (OR: 98.4, 95%CI: 27.9-347.0), coexistence of HCC (OR: 7.4, 95%CI: 2.0-27.4), and lacking follow up EVL (OR: 6.1, 95%CI: 1.2-31.1). Recurrent bleeding after emergency endoscopic ligation of acute esophageal variceal bleeding in cirrhotic cases is a rather common complication that significantly increases the mortality rate. The liver condition, lack of follow up endoscopy, old age, and severity of esophageal varices are independent prognostic indicator of rebleeding and morality.
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Affiliation(s)
- A A Salman
- Internal Medicine Department, Faculty of medicine, Cairo University, 11311 Cairo, Egypt
| | - H E Shaaban
- National Hepatology and Tropical Medicine Research Institute
| | - M Atallah
- National Hepatology and Tropical Medicine Research Institute
| | - M Yousef
- Tropical Medicine Department, Faculty of medicine, Cairo University, Egypt
| | - R A Ahmed
- Internal Medicine Department, Faculty of medicine, Cairo University, 11311 Cairo, Egypt
| | - O Ashoush
- Internal Medicine Department, Faculty of medicine, Cairo University, 11311 Cairo, Egypt
| | - M Tourky
- General surgery senior registrar, Alawi Tunsi, Saudi Arabia
| | - M A Nafea
- General Surgery Department, Faculty of medicine, Al-Azhar University, Egypt
| | - M H Elshafey
- General Surgery Department, Faculty of medicine, Al-Azhar University, Egypt
| | - M El-Ghobary
- Internal Medicine Department, Faculty of medicine, Cairo University, 11311 Cairo, Egypt
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6
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Sylman JL, Mitrugno A, Atallah M, Tormoen GW, Shatzel JJ, Tassi Yunga S, Wagner TH, Leppert JT, Mallick P, McCarty OJT. The Predictive Value of Inflammation-Related Peripheral Blood Measurements in Cancer Staging and Prognosis. Front Oncol 2018; 8:78. [PMID: 29619344 PMCID: PMC5871812 DOI: 10.3389/fonc.2018.00078] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 03/07/2018] [Indexed: 12/23/2022] Open
Abstract
In this review, we discuss the interaction between cancer and markers of inflammation (such as levels of inflammatory cells and proteins) in the circulation, and the potential benefits of routinely monitoring these markers in peripheral blood measurement assays. Next, we discuss the prognostic value and limitations of using inflammatory markers such as neutrophil-to-lymphocyte and platelet-to-lymphocyte ratios and C-reactive protein measurements. Furthermore, the review discusses the benefits of combining multiple types of measurements and longitudinal tracking to improve staging and prognosis prediction of patients with cancer, and the ability of novel in silico frameworks to leverage this high-dimensional data.
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Affiliation(s)
- Joanna L Sylman
- VA Palo Alto Health Care System, Palo Alto, CA, United States.,Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, United States.,Canary Center at Stanford, Department of Radiology, Stanford University School of Medicine, Stanford, CA, United States
| | - Annachiara Mitrugno
- Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, United States
| | - Michelle Atallah
- Canary Center at Stanford, Department of Radiology, Stanford University School of Medicine, Stanford, CA, United States
| | - Garth W Tormoen
- Department of Radiation Medicine, Oregon Health & Science University, Portland, OR, United States
| | - Joseph J Shatzel
- Division of Hematology and Medical Oncology, Oregon Health & Science University, Portland, OR, United States.,Cancer Early Detection & Advanced Research Center, Oregon Health & Science University, Portland, OR, United States
| | - Samuel Tassi Yunga
- Cancer Early Detection & Advanced Research Center, Oregon Health & Science University, Portland, OR, United States.,Knight Cancer Institute, Oregon Health & Science University, Portland, OR, United States
| | - Todd H Wagner
- VA Palo Alto Health Care System, Palo Alto, CA, United States.,Department of Surgery, Stanford University School of Medicine, Stanford, CA, United States
| | - John T Leppert
- VA Palo Alto Health Care System, Palo Alto, CA, United States.,Department of Urology, Stanford University School of Medicine, Stanford, CA, United States
| | - Parag Mallick
- Canary Center at Stanford, Department of Radiology, Stanford University School of Medicine, Stanford, CA, United States
| | - Owen J T McCarty
- Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, United States
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7
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Lee JR, Chan CT, Ruderman D, Chuang HY, Gaster RS, Atallah M, Mallick P, Lowe SW, Gambhir SS, Wang SX. Longitudinal Monitoring of Antibody Responses against Tumor Cells Using Magneto-nanosensors with a Nanoliter of Blood. Nano Lett 2017; 17:6644-6652. [PMID: 28990786 PMCID: PMC5851288 DOI: 10.1021/acs.nanolett.7b02591] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Each immunoglobulin isotype has unique immune effector functions. The contribution of these functions in the elimination of pathogens and tumors can be determined by monitoring quantitative temporal changes in isotype levels. Here, we developed a novel technique using magneto-nanosensors based on the effect of giant magnetoresistance (GMR) for longitudinal monitoring of total and antigen-specific isotype levels with high precision, using as little as 1 nL of serum. Combining in vitro serologic measurements with in vivo imaging techniques, we investigated the role of the antibody response in the regression of firefly luciferase (FL)-labeled lymphoma cells in spleen, kidney, and lymph nodes in a syngeneic Burkitt's lymphoma mouse model. Regression status was determined by whole body bioluminescent imaging (BLI). The magneto-nanosensors revealed that anti-FL IgG2a and total IgG2a were elevated and sustained in regression mice compared to non-regression mice (p < 0.05). This platform shows promise for monitoring immunotherapy, vaccination, and autoimmunity.
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Affiliation(s)
- Jung-Rok Lee
- Division of Mechanical and Biomedical Engineering, Ewha Womans University, Seoul 03760, South Korea
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
| | - Carmel T. Chan
- Department of Medicine, Department of Radiology, Stanford University, Stanford, California 94305, United States
| | - Daniel Ruderman
- Ellison Institute of Transformative Medicine of USC, USC Keck School of Medicine, Los Angeles, California 90211, United States
| | - Hui-Yen Chuang
- Department of Medicine, Department of Radiology, Stanford University, Stanford, California 94305, United States
| | - Richard S. Gaster
- Department of Bioengineering, Stanford University, Stanford, California 94305, United States
- Pliant Therapeutics, Redwood City, California 94063, United States
| | - Michelle Atallah
- Cancer Biology Program, Stanford School of Medicine, Stanford, California 94305, United States
| | - Parag Mallick
- Department of Medicine, Department of Radiology, Stanford University, Stanford, California 94305, United States
| | - Scott W. Lowe
- Cancer Biology and Genetics Program, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Sanjiv S. Gambhir
- Department of Medicine, Department of Radiology, Stanford University, Stanford, California 94305, United States
| | - Shan X. Wang
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
- Department of Medicine, Department of Radiology, Stanford University, Stanford, California 94305, United States
- Department of Electrical Engineering, Stanford University, Stanford, California 94305, United States
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Sills J, Mazzone J, Atallah M, Teraoka J, Harris O. NON-PHARMACOLOGICAL MANAGEMENT OF DISTRESS AMONG COMMUNITY LIVING CENTER RESIDENTS USING TECHNOLOGY. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.3073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- J. Sills
- VA Palo Alto Health Care System, Palo Alto, California,
| | - J. Mazzone
- VA Palo Alto Health Care System, Palo Alto, California,
| | - M. Atallah
- VA Palo Alto Health Care System, Palo Alto, California,
| | - J. Teraoka
- VA Palo Alto Health Care System, Palo Alto, California,
| | - O. Harris
- VA Palo Alto Health Care System, Palo Alto, California,
- Stanford University, Stanford, California
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Abstract
Proteins play a key role in all aspects of cellular homeostasis. Proteomics, the large-scale study of proteins, provides in-depth data on protein properties, including abundances and post-translational modification states, and as such provides a rich avenue for the investigation of biological and disease processes. While proteomic tools such as mass spectrometry have enabled exquisitely sensitive sample analysis, sample preparation remains a critical unstandardized variable that can have a significant impact on downstream data readouts. Consistency in sample preparation and handling is therefore paramount in the collection and analysis of proteomic data.Here we describe methods for performing protein extraction from cell culture or tissues, digesting the isolated protein into peptides via in-solution enzymatic digest, and peptide cleanup with final preparations for analysis via liquid chromatography-mass spectrometry. These protocols have been optimized and standardized for maximum consistency and maintenance of sample integrity.
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Affiliation(s)
- Michelle Atallah
- Canary Center at Stanford for Cancer Early Detection, Stanford University, 3155 Porter Drive, Palo Alto, CA, 94304, USA
| | - Mark R Flory
- Canary Center at Stanford for Cancer Early Detection, Stanford University, 3155 Porter Drive, Palo Alto, CA, 94304, USA
| | - Parag Mallick
- Canary Center at Stanford for Cancer Early Detection, Stanford University, 3155 Porter Drive, Palo Alto, CA, 94304, USA.
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Longo DM, Louie B, Ptacek J, Friedland G, Evensen E, Putta S, Atallah M, Spellmeyer D, Wang E, Pos Z, Marincola FM, Schaeffer A, Lukac S, Railkar R, Beals CR, Cesano A, Carayannopoulos LN, Hawtin RE. High-dimensional analysis of the aging immune system: verification of age-associated differences in immune signaling responses in healthy donors. J Transl Med 2014; 12:178. [PMID: 24952610 PMCID: PMC4229969 DOI: 10.1186/1479-5876-12-178] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [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: 02/11/2014] [Accepted: 06/16/2014] [Indexed: 12/15/2022] Open
Abstract
Background Single-cell network profiling (SCNP) is a multiparametric flow cytometry-based approach that simultaneously measures evoked signaling in multiple cell subsets. Previously, using the SCNP approach, age-associated immune signaling responses were identified in a cohort of 60 healthy donors. Methods In the current study, a high-dimensional analysis of intracellular signaling was performed by measuring 24 signaling nodes in 7 distinct immune cell subsets within PBMCs in an independent cohort of 174 healthy donors [144 elderly (>65 yrs); 30 young (25–40 yrs)]. Results Associations between age and 9 immune signaling responses identified in the previously published 60 donor cohort were confirmed in the current study. Furthermore, within the current study cohort, 48 additional immune signaling responses differed significantly between young and elderly donors. These associations spanned all profiled modulators and immune cell subsets. Conclusions These results demonstrate that SCNP, a systems-based approach, can capture the complexity of the cellular mechanisms underlying immunological aging. Further, the confirmation of age associations in an independent donor cohort supports the use of SCNP as a tool for identifying reproducible predictive biomarkers in areas such as vaccine response and response to cancer immunotherapies.
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Ptacek J, Hawtin R, Louie B, Evensen E, Cordeiro J, Mittleman B, Atallah M, Cesano A, Cavet G, Bingham C, Cofield S, Curtis J, Danila M, Furie R, Genovese M, Levesque M, Moreland L, Nigrovic P, O'Dell J, Robinson W, Shadick N, St. Clair E, Striebich C, Thiele G, Gregersen P, Bridges S. FRI0035 Prediction of TNF Inhibitor Response in Rheumatoid Arthritis Patients Using Single Cell Network Profiling of Intracellular Immune Signaling. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.2057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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12
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Ptacek J, Hawtin R, Louie B, Evensen E, Cordeiro J, Mittleman B, Atallah M, Cesano A, Gregersen P, Bridges S. Intracellular signaling as measured by single cell network profiling (SCNP) is stable in longtitudinal samples of peripheral blood mononuclear cells (PBMC) from healthy donors (HD) across multiple immune cell subsets (TECH1P.839). The Journal of Immunology 2014. [DOI: 10.4049/jimmunol.192.supp.69.7] [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] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Biomarkers of immune function from viable cells would be of high value for many clinical applications. The immune system responds rapidly to a variety of stimuli, so identifying immune measures that are stable, robust, and relevant to clinical features/outcomes can be challenging. SCNP is a multiparametric flow cytometry assay measuring induced changes in intracellular signaling, providing a functional measure of pathway capacity in multiple cell subsets without physical separation. To assess the longitudinal stability of signaling capacity, PBMCs from 11 healthy donors (7 female, age 29 - 60) were collected at 2 time points and characterized by SCNP of 32 nodes (combinations of a modulator and an intracellular signaling readout) in 21 cell subsets. Signaling stability was assessed for each node:subset combination, calculating the ratio of the signaling variability between time points to the mean signaling level. Of 258 node:subset combinations measured: 160 (62%) had a ratio <0.1; 227 (88%) were <0.2 (i.e. the variability between time points is <20% of the average signaling). Memory B cells had the greatest, though modest, variability in signaling between sample times (median ratio 0.15, range 0.04 - 0.43); naive CD4- T cells had the least variation (median ratio 0.066, range 0.03 - 0.13). This study serves as reference for biomarker development for immune monitoring, demonstrating that signaling capacity is a stable, robust phenotype over time and within an individual.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Peter Gregersen
- 2The Feinstein Institute for Medical Research and North Shore-LIJ Health System, Manhasset, NY
| | - S. Bridges
- 3University of Alabama at Birmingham, Birmingham, AL
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Westfall M, Hawtin R, Covey T, Gulrajani M, Atallah M, Cholankeril M, Vora R, Cesano A, Fields SZ, Raftopoulos H. Abstract 3523: Quantitative measurements of EGFR pathway signaling and modulation in pleural effusion samples from non-small cell lung cancer (NSCLC) patients using single cell network profiling (SCNP). Cancer Res 2013. [DOI: 10.1158/1538-7445.am2013-3523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: SCNP is a multiparametric flow cytometry-based assay that quantitatively and simultaneously measures, at the single cell level, both extracellular surface markers and activation levels of intracellular signaling proteins in response to modulation. SCNP has been successfully applied to hematologic malignancies in both prognostic and predictive analyses. Previous work using bladder washes from bladder cancer patients (pts) established the feasibility of applying SCNP to the functional characterization of epithelial cell signaling and response to modulation and targeted kinase inhibition in non-conventional samples.
Objectives: Assess the feasibility of applying SCNP to detect and functionally characterize epithelial cells, including sensitivity to targeted kinase inhibition, in pleural effusion (PE) samples from NSCLC pts.
Methods: PE from confirmed NSCLC pts (n=4) were collected at the NSUH and shipped overnight to Nodality for processing on day of receipt. Antibodies to CD45, CytoKeratin (CK), EpCAM, and cPARP were used to differentiate non-apoptotic epithelial cells from leukocytes. DNA aneuploidy was evaluated using the lymphoid population in the patient samples as a diploid G0/G1 reference. Signaling in PI3K and MAPK pathways was quantified through measurement of p-AKT and p-ERK levels at baseline and after in vitro exposure to EGF +/- PI3K inhibitor GDC-0941. The epithelial bladder carcinoma cell line HT-1376 was used as a positive control for epithelial phenotypic staining and EGF-induced signaling.
Results: In 3 of 4 PE samples, epithelial cells (DAPI+, CD45-, CK+, and EpCAM+) were identified (range 0.35% to 15.87% of all nucleated cells). Epithelial cells had a DNA index >1.3, indicating aneuploidy and therefore tumor origin. The majority of epithelial cells were cPARP negative (>80%) and suitable for SCNP analysis. In all 3 samples with epithelial cells: 1) EGF modulation induced increased p-AKT and p-ERK; 2) Pre-treatment with GDC-0941 inhibited EGF induced p-AKT but not p-ERK; 3) Constitutive activation of the PI3K pathway in the tumor epithelial cells was suggested by reduction in p-AKT levels compared to basal (no EGF exposure) following GDC-0941 treatment.
Conclusion: This study demonstrates the feasibility of applying SCNP to the functional characterization of PE samples from NSCLC pts. Ongoing analyses will expand upon these data, including both additional NSCLC PE samples and the evaluation of compounds targeting alternative signaling pathways relevant to NSCLC (eg: MAPK, EGFR). The feasibility of extending such SCNP analyses to other solid tumor indications, using alternative tissue sources and circulating tumor cells, is under further investigation for both prognostic and response predictive utility.
[S.Z. Fields and H. Raftopoulos are senior co-authors.]
Citation Format: Matt Westfall, Rachael Hawtin, Todd Covey, Michael Gulrajani, Michelle Atallah, Michelle Cholankeril, Reena Vora, Alessandra Cesano, Scott Z. Fields, Haralambos Raftopoulos. Quantitative measurements of EGFR pathway signaling and modulation in pleural effusion samples from non-small cell lung cancer (NSCLC) patients using single cell network profiling (SCNP). [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 3523. doi:10.1158/1538-7445.AM2013-3523
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Affiliation(s)
| | | | - Todd Covey
- 1Nodality, Inc., South San Francisco, CA
| | | | | | | | - Reena Vora
- 2North Shore-Long Island Jewish Health System, Lake Success, NY
| | | | - Scott Z. Fields
- 2North Shore-Long Island Jewish Health System, Lake Success, NY
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Lunyak VV, Atallah M. Genomic relationship between SINE retrotransposons, Pol III-Pol II transcription, and chromatin organization: the journey from junk to jewel. Biochem Cell Biol 2011; 89:495-504. [PMID: 21916613 DOI: 10.1139/o11-046] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
A typical eukaryotic genome harbors a rich variety of repetitive elements. The most abundant are retrotransposons, mobile retroelements that utilize reverse transcriptase and an RNA intermediate to relocate to a new location within the cellular genomes. A vast majority of the repetitive mammalian genome content has originated from the retrotransposition of SINE (100-300 bp short interspersed nuclear elements that are derived from the structural 7SL RNA or tRNA), LINE (7kb long interspersed nuclear element), and LTR (2-3 kb long terminal repeats) transposable element superfamilies. Broadly labeled as "evolutionary junkyard" or "fossils", this enigmatic "dark matter" of the genome possesses many yet to be discovered properties.
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15
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Wang J, Geesman GJ, Hostikka SL, Atallah M, Blackwell B, Lee E, Cook PJ, Pasaniuc B, Shariat G, Halperin E, Dobke M, Rosenfeld MG, Jordan IK, Lunyak VV. Inhibition of activated pericentromeric SINE/Alu repeat transcription in senescent human adult stem cells reinstates self-renewal. Cell Cycle 2011; 10:3016-30. [PMID: 21862875 PMCID: PMC3218602 DOI: 10.4161/cc.10.17.17543] [Citation(s) in RCA: 76] [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: 07/28/2011] [Accepted: 07/28/2011] [Indexed: 01/01/2023] Open
Abstract
Cellular aging is linked to deficiencies in efficient repair of DNA double strand breaks and authentic genome maintenance at the chromatin level. Aging poses a significant threat to adult stem cell function by triggering persistent DNA damage and ultimately cellular senescence. Senescence is often considered to be an irreversible process. Moreover, critical genomic regions engaged in persistent DNA damage accumulation are unknown. Here we report that 65% of naturally occurring repairable DNA damage in self-renewing adult stem cells occurs within transposable elements. Upregulation of Alu retrotransposon transcription upon ex vivo aging causes nuclear cytotoxicity associated with the formation of persistent DNA damage foci and loss of efficient DNA repair in pericentric chromatin. This occurs due to a failure to recruit of condensin I and cohesin complexes. Our results demonstrate that the cytotoxicity of induced Alu repeats is functionally relevant for the human adult stem cell aging. Stable suppression of Alu transcription can reverse the senescent phenotype, reinstating the cells' self-renewing properties and increasing their plasticity by altering so-called "master" pluripotency regulators.
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Affiliation(s)
- Jianrong Wang
- School of Biology, Georgia Institute of Technology, Atlanta, GA, USA
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16
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Zaguri R, Verbovetski I, Atallah M, Trahtemberg U, Krispin A, Nahari E, Leitersdorf E, Mevorach D. 'Danger' effect of low-density lipoprotein (LDL) and oxidized LDL on human immature dendritic cells. Clin Exp Immunol 2007; 149:543-52. [PMID: 17645766 PMCID: PMC2219334 DOI: 10.1111/j.1365-2249.2007.03444.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/21/2007] [Indexed: 01/22/2023] Open
Abstract
Dendritic cell (DC) maturation may accelerate autoimmune diseases such as systemic lupus erythematosus and rheumatoid arthritis, and may contribute to accelerated atherosclerosis seen in these patients. The immune system responds to both exogenous and endogenous 'dangerous' signals that can induce dendritic cell maturation. We have found that autologous plasma contains danger signals that induce up-regulation of major histocompatibility complex (MHC) class II and co-stimulatory molecules in immature DCs (iDCs). The objective of this study was to determine whether low-density lipoprotein (LDL) and/or oxidized LDL (oxLDL) constitute danger signals, and to assess the effect of exposure to LDL and oxLDL following monocyte differentiation into iDCs in lipoprotein-deficient serum (LPDS). IDCs were generated in the presence of autologous plasma or LPDS. Expression of maturation and migration molecules was evaluated using flow cytometry, and morphology was assessed by light microscopy. Pro- or anti-apoptotic effect was determined using annexin V and propidium iodide binding. Phagocytosis of apoptotic cells was evaluated using autologous plasma or LPDS. LDL and oxLDL were clearly able to slightly up-regulate levels of HLA-DR and co-stimulatory molecule CD86. High oxLDL concentrations (50-100 microg/ml) were associated with expression of additional maturation molecules. Moreover, iDCs that were prepared in LPDS showed partial maturation following exposure to LDL and oxLDL, and improved tolerogenic apoptotic cell uptake. This study suggests that oxLDL, and to some extent LDL, are at least partly responsible for the iDC 'danger' response induced by autologous plasma.
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Affiliation(s)
- R Zaguri
- Laboratory for Cellular and Molecular Immunology, Rheumatology Unit, Department of Medicine, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
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Kampranis SC, Damianova R, Atallah M, Toby G, Kondi G, Tsichlis PN, Makris AM. A novel plant glutathione S-transferase/peroxidase suppresses Bax lethality in yeast. J Biol Chem 2000; 275:29207-16. [PMID: 10859306 DOI: 10.1074/jbc.m002359200] [Citation(s) in RCA: 153] [Impact Index Per Article: 6.4] [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: 11/06/2022] Open
Abstract
The mammalian inducer of apoptosis Bax is lethal when expressed in yeast and plant cells. To identify potential inhibitors of Bax in plants we transformed yeast cells expressing Bax with a tomato cDNA library and we selected for cells surviving after the induction of Bax. This genetic screen allows for the identification of plant genes, which inhibit either directly or indirectly the lethal phenotype of Bax. Using this method a number of cDNA clones were isolated, the more potent of which encodes a protein homologous to the class theta glutathione S-transferases. This Bax-inhibiting (BI) protein was expressed in Escherichia coli and found to possess glutathione S-transferase (GST) and weak glutathione peroxidase (GPX) activity. Expression of Bax in yeast decreases the intracellular levels of total glutathione, causes a substantial reduction of total cellular phospholipids, diminishes the mitochondrial membrane potential, and alters the intracellular redox potential. Co-expression of the BI-GST/GPX protein brought the total glutathione levels back to normal and re-established the mitochondrial membrane potential but had no effect on the phospholipid alterations. Moreover, expression of BI-GST/GPX in yeast was found to significantly enhance resistance to H(2)O(2)-induced stress. These results underline the relationship between oxidative stress and Bax-induced death in yeast cells and demonstrate that the yeast-based genetic strategy described here is a powerful tool for the isolation of novel antioxidant and antiapoptotic genes.
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Affiliation(s)
- S C Kampranis
- Mediterranean Agronomic Institute of Chania, Chania 73100, Greece
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Ennouri A, Chouaieb W, Ferjani M, Marrekchi H, Atallah M. [Congenital cysts and fistulas of the neck (apropos of 129 cases)]. Tunis Med 1989; 67:421-6. [PMID: 2799966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Johnson HJ, Northup SJ, Seagraves PA, Atallah M, Garvin PJ, Lin L, Darby TD. Biocompatibility test procedures for materials evaluation in vitro. II. Objective methods of toxicity assessment. J Biomed Mater Res 1985; 19:489-508. [PMID: 4066724 DOI: 10.1002/jbm.820190503] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Methods of assessing the biocompatibility of materials for use in medical devices were evaluated. Ten materials were tested using quantitative, objectively graded in vitro biochemical and functional assays employing four cell lines (CCL 1, 74, 76, and 131) used in previous work and five primary cell types (human lymphocytes, polymorphonuclear leukocytes, and mixed leukocytes, mouse macrophages, and mouse embryo). The biochemical methods (DNA synthesis, protein synthesis, and ATP activity) demonstrated good agreement in toxicity ranking of the materials, regardless of which cell culture was used and, also, the cell cultures responded similarly for each method. Methods that measured functional characteristics of cells (adhesion and phagocytosis) were highly sensitive but had low toxicity ranking agreement and reproducibility. Assays (defined as method and cell culture combinations) using cell lines were more reproducible than assays using primary cell types. Significant differences in sensitivity were noted among the assay systems for particular material types. The in vitro assays were more sensitive to differences in material composition than was a 90-day assay by subcutaneous implantation in rats.
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Cook AW, Abbate A, Atallah M, Pacheco S, Kleriga E, Saada S, Nidzgorski F. Neurogenic bladder. Reversal by stimulation of thoracic spinal cord. N Y State J Med 1979; 79:255-8. [PMID: 311907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Abstract
We treated 40 patients who had multiple sclerosis and bladder symptoms with thoracic spinal cord electrical stimulation. Bladder and sphincter dysfunction was evaluated by cystometry and electromyography. Subjective improvement was noted in 77.5 per cent of the patients and documented improvement was found on cystometry and electromyography in 42.5 per cent. By electrical stimulation of the spinal cord we have demonstrated varying degrees of restoration of voluntary and reflex control of the bladder and sphincter.
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Atallah M. [A difficult decannulation]. Tunis Med 1969; 47:189-90. [PMID: 5385930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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