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Choi SE, Mo E, Sima C, Wu H, Thakkar-Samtani M, Tranby EP, Frantsve-Hawley J, Barrow JR. Impact of COVID-19 on Dental Care Utilization and Oral Health Conditions in the United States. JDR Clin Trans Res 2023:23800844231165016. [PMID: 37082861 PMCID: PMC10125887 DOI: 10.1177/23800844231165016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023] Open
Abstract
PURPOSE We aim to understand the impact of the COVID-19 on health care utilization and oral health conditions of patients at federally qualified health centers (FQHCs), where patients are disproportionately low income, publicly insured, or uninsured. METHODS Using deidentified electronic health records of patients at FQHCs in the United States from January 2019 through December 2020 (n = 431,509), variations in health care utilization since the COVID-19 outbreak were observed by procedure types and patient characteristics. Changes in dental utilization and oral health conditions were characterized using mixed-effect negative binomial and logistic regression models. RESULTS Dental utilization decreased more drastically than medical utilization during shelter-in-place periods in 2020 and rebounded more slowly after the reopening. Greater demands for oral surgery and teledentistry and less demands for preventive services were observed in 2020. As compared to 2019, patients experienced more psychological stress-related dental conditions with odds ratios of 1.52 (95% confidence interval [CI], 1.31-1.76) for uninsured, 1.48 (95% CI, 1.07-2.02) for Medicaid enrollees, and 2.38 (95% CI, 1.68-3.40) for private insurance beneficiaries. CONCLUSION As a result of COVID-19, patients received more invasive dental procedures due to delayed treatment and experienced a higher risk of psychological stress-related dental conditions. Continued support for statewide policies to expand access to oral health care and oral health promotion strategies for the vulnerable populations would be encouraged. KNOWLEDGE TRANSFER STATEMENT Our study describes the impact of COVID-19 on dental care use and oral health conditions at Federally Qualified Health Centers, targeted to provide care for some of the most vulnerable populations in the United States. The results of this retrospective cohort study can be used by clinicians and policymakers on understanding the clinical needs of the vulnerable populations after the pandemic. It highlights the need for continued support to expand access to oral health care and oral health promotion to these populations.
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Affiliation(s)
- S E Choi
- Department of Oral Health Policy and Epidemiology, Harvard School of Dental Medicine, Boston, MA, USA
| | - E Mo
- Office of Global and Community Health, Harvard School of Dental Medicine, Boston, MA, USA
| | - C Sima
- Department of Oral Medicine, Infection, and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - H Wu
- Office of Global and Community Health, Harvard School of Dental Medicine, Boston, MA, USA
| | - M Thakkar-Samtani
- Analytics and Evaluation, CareQuest Institute for Oral Health, Boston, MA, USA
| | - E P Tranby
- Analytics and Evaluation, CareQuest Institute for Oral Health, Boston, MA, USA
| | - J Frantsve-Hawley
- Analytics and Evaluation, CareQuest Institute for Oral Health, Boston, MA, USA
| | - J R Barrow
- Office of Global and Community Health, Harvard School of Dental Medicine, Boston, MA, USA
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Ursu R, Iordache P, Radoi V, Ursu G, Cucu N, Chirica V, Iacob D, Sima C, Dragoi O, Poenaru E, Bohiltea L, Manolescu A, Jinga V. Genetic markers for hypertension – a genetic epidemiological study of 5000 Romanian individuals. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.2747] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
During the past decades, genetic research has reached new heights as next generation sequencing has rapidly taken over and genome-wide association studies (GWAS) have broug.
The purpose of the research is to determin high-risk variants (Single-Nucleotide-Variants,SNVs) associated with hypertension (HTA) in the Romanian population.
The current presentation asseses the final results of a 3 part study comprising the first and the largest GWAS on hypertension in Romanians.
Material
Methods The total cohort includes a number of 5690 individuals, of which 2190 with hypertension and 3500 heathy controls.
Genetic testing was performed at in Iceland.
A multiple GWAS assay has been performed for the identification of variants associated with hypertension, hypertension risk factors and hypertension comorbidities.
Results
Environmental (lifestyle) risk factors, such as smoking, alcohol consumption and coffee consumption, and also pathological risk factors, as are obesity and ageing, were analyzed in association with hypertension.
Tissue-specific protein expression, gene function and gene-gene interactions have been analyzed for assessing a possible biological explanation of the association between the identified related variants and HTA. Expression quantitative trait loci (eQTL) were assessed for variants in the reported locations for a better understanding of their involvement in HTA.
The results of the analysis revealed a number of over 5000 genetic variants statistically correlated with hypertension in the studied cohort, some well documented and in genes known to be involved in hypertension pathophysiology (clusters on chromosomes 1p36, 1q24, 3q24, 4p16, 5q12, 7q36, 12p12, 15q, 17q, 20q12, a.o. or CRNKL1, C19Orf12, CCDC51, C20Orf26, ZNF420, ZNF571, a.o. intragenic variants). Approx. 4100 SNVs were identified in correlation with diabetes mellitus and obesity.
Variants correlated with both hypertension and DM were identified (TBX20,ANK2, a.o. genes). Two other variant clusters (p=10–4–10–3) on chromosomes 19 (19q12) and 20 (20p11.21) revealed statistical correlations with both hypertension and obesity.
Conclusions
The present study found some important loci and clusters associated with HTA, which migh provide insights into the genetic architecture of this pathology.
The validity of these results for the Romanian population need to be confirmed by replication studies.
The current research is part of the EU ProMark, ROMCAN and AppGenEdu projects.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- R.I Ursu
- University of Medicine and Pharmacy Carol Davila, Medical Genetics, Faculty of General Medicine, Bucharest, Romania
| | - P Iordache
- University of Medicine and Pharmacy Carol Davila, Epidemiology, Bucharest, Romania
| | - V.E Radoi
- University of Medicine and Pharmacy Carol Davila, Medical Genetics, Faculty of General Medicine, Bucharest, Romania
| | - G.F Ursu
- National Authority of Quality Management in Health, Bucharest, Romania
| | - N Cucu
- University of Bucharest, Faculty of Biology, Genetics, Bucharest, Romania
| | - V Chirica
- “Mina Minovici” National Institute of Legal Medicine, Bucharest, Romania
| | - D Iacob
- “Matei Bals” Nationa Institute for Infectious Diseases, Bucharest, Romania
| | - C Sima
- Clinical Hospital Dr Theodor Burghele, Bucharest, Romania
| | - O.D Dragoi
- Fundeni Clinical Institute, Haematology, Bucharest, Romania
| | - E Poenaru
- University of Medicine and Pharmacy Carol Davila, Bucharest, Romania
| | - L.C Bohiltea
- University of Medicine and Pharmacy Carol Davila, Medical Genetics, Faculty of General Medicine, Bucharest, Romania
| | - A Manolescu
- Reykjavik University, School of Science and Engineering, Reykjavik, Iceland
| | - V Jinga
- University of Medicine and Pharmacy Carol Davila, Bucharest, Romania
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Sima C, Iordache P, Poenaru E, Manolescu A, Poenaru C, Jinga V. Genome-wide association study of nephrolithiasis in an Eastern European population. Int Urol Nephrol 2020; 53:309-313. [PMID: 32865774 DOI: 10.1007/s11255-020-02606-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 08/06/2020] [Indexed: 12/25/2022]
Abstract
PURPOSE Nephrolithiasis is a urological pathology that occurs at high rates and carries a great burden in terms of costs. The probability of recurrence is significant, necessitating improvements in prophylaxis and understanding of the disease mechanism. Despite the high heritability of this disease, only five genome-wide association studies (GWAS) of nephrolithiasis have been published. METHODS We selected 335 unrelated confirmed nephrolithiasis cases from two major sample collection projects (blood and buccal swabs) in Romania. DNA was extracted from whole blood and buccal swabs at deCODE Genetics (Reykjavik, Iceland) and genotyped. RESULTS Single-nucleotide polymorphisms identified from this GWAS implicated biological pathways and gene ontologies involving solute transport, renal physiology, and calcium homeostasis. Three loci especially emerged as candidates with a highly significant association with nephrolithiasis: RS10917682 in Regulator of G protein signaling 5, which has crucial roles in mRNA regulation and has been linked to renal cell carcinoma; RS1118528 in Solute carrier family 25 member 24, which encodes a mitochondrial ATP-Mg/phosphate carrier protein that likely influences a variety of important cellular pathways; and the TOX2-associated locus rs4437026, because TOX2 is upregulated in several tumor types and linked to tumor progression. CONCLUSION This study is the largest kidney stone-related GWAS reported in an Eastern European population and the first GWAS performed in a Romanian population to investigate the genetic risk factors for nephrolithiasis. We identified several loci that warrant further investigation for a better understanding of this highly heritable condition.
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Affiliation(s)
- C Sima
- "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
- "Prof. Dr. Th. Burghele" Clinical Hospital, Bucharest, Romania
| | - P Iordache
- "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
- Exigia Medical, Bucharest, Romania
| | - E Poenaru
- "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania.
| | | | | | - V Jinga
- "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
- "Prof. Dr. Th. Burghele" Clinical Hospital, Bucharest, Romania
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Viniegra A, Goldberg H, Çil Ç, Fine N, Sheikh Z, Galli M, Freire M, Wang Y, Van Dyke T, Glogauer M, Sima C. Resolving Macrophages Counter Osteolysis by Anabolic Actions on Bone Cells. J Dent Res 2018; 97:1160-1169. [PMID: 29993312 PMCID: PMC6169030 DOI: 10.1177/0022034518777973] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Progression of inflammatory osteolytic diseases, including rheumatoid arthritis and periodontitis, is characterized by increased production of proinflammatory mediators and matrix-degrading enzymes by macrophages and increased osteoclastic activity. Phenotypic changes in macrophages are central to the healing process in virtually all tissues. Using a murine model of periodontitis, we assessed the timing of macrophage phenotypic changes and the impact of proresolving activation during inflammatory osteolysis and healing. Proinflammatory macrophage activation and TNF-α overproduction within 3 wk after induction of periodontitis was associated with progressing bone loss. Proresolving activation within 1 wk of stimulus removal and markers of resolving macrophages (IL-10, TGF-β, and CD206) correlated strongly with bone levels. In vivo macrophage depletion with clodronate liposomes prevented bone resorption but impaired regeneration. Induction of resolving macrophages with rosiglitazone, a PPAR-γ agonist, led to reduced bone resorption during inflammatory stimulation and increased bone formation during healing. In vitro assessment of primary bone marrow-derived macrophages activated with either IFN-γ and LPS (proinflammatory activation) or IL-4 (proresolving activation) showed that IL-4-activated cells have enhanced resolving functions (production of anti-inflammatory cytokines; migration and phagocytosis of aged neutrophils) and exert direct anabolic actions on bone cells. Cystatin C secreted by resolving but not inflammatory macrophages explained, in part, the macrophage actions on osteoblasts and osteoclasts. This study supports the concept that therapeutic induction of proresolving functions in macrophages can recouple bone resorption and formation in inflammatory osteolytic diseases.
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Affiliation(s)
- A. Viniegra
- Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - H. Goldberg
- Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - Ç. Çil
- Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - N. Fine
- Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - Z. Sheikh
- Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, ON, Canada
| | - M. Galli
- Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - M. Freire
- Department of Genomic Medicine and Infectious Diseases, J. Craig Venter Institute, La Jolla, CA, USA
| | - Y. Wang
- Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - T.E. Van Dyke
- Center for Clinical and Translational Research, The Forsyth Institute, Cambridge, MA, USA
- Department of Oral Medicine Infection and Immunity, Harvard School of Dental Medicine, Harvard Medical School, Boston, MA, USA
| | - M. Glogauer
- Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - C. Sima
- Center for Clinical and Translational Research, The Forsyth Institute, Cambridge, MA, USA
- Department of Oral Medicine Infection and Immunity, Harvard School of Dental Medicine, Harvard Medical School, Boston, MA, USA
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Sima C, Cai B, Liu B, Gao Y, Yu Y, Gates JC, Zervas MN, Smith PGR, Liu D. Integrated reconfigurable photonic filters based on interferometric fractional Hilbert transforms. Appl Opt 2017; 56:7978-7984. [PMID: 29047786 DOI: 10.1364/ao.56.007978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 09/05/2017] [Indexed: 06/07/2023]
Abstract
In this paper, we present integrated reconfigurable photonic filters using fractional Hilbert transformers (FrHTs) and optical phase tuning structure within the silica-on-silicon platform. The proposed structure, including grating-based FrHTs, an X-coupler, and a pair of thermal tuning filaments, is fabricated through the direct UV grating writing technique. The thermal tuning effect is realized by the controllable microheaters located on the two arms of the X-coupler. We investigate the 200 GHz maximum bandwidth photonic FrHTs based on apodized planar Bragg gratings, and analyze the reflection spectrum responses. Through device integration and thermal modulation, the device could operate as photonic notch filters with 5 GHz linewidth and controllable single sideband suppression filters with measured 12 dB suppression ratio. A 50 GHz instantaneous frequency measuring system using this device is also schematically proposed and analyzed with potential 3 dB measurement improvement. The device could be configured with these multiple functions according to need. The reconfigurable structure has great potential in ultrafast all-optical signal processing fields.
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Yu HA, Sima C, Feldman D, Liu LL, Vaitheesvaran B, Cross J, Rudin CM, Kris MG, Pao W, Michor F, Riely GJ. Phase 1 study of twice weekly pulse dose and daily low-dose erlotinib as initial treatment for patients with EGFR-mutant lung cancers. Ann Oncol 2017; 28:278-284. [PMID: 28073786 PMCID: PMC5834093 DOI: 10.1093/annonc/mdw556] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Background Patients with EGFR-mutant lung cancers treated with EGFR tyrosine kinase inhibitors (TKIs) develop clinical resistance, most commonly with acquisition of EGFR T790M. Evolutionary modeling suggests that a schedule of twice weekly pulse and daily low-dose erlotinib may delay emergence of EGFR T790M. Pulse dose erlotinib has superior central nervous system (CNS) penetration and may result in superior CNS disease control. Methods We evaluated toxicity, pharmacokinetics, and efficacy of twice weekly pulse and daily low-dose erlotinib. We assessed six escalating pulse doses of erlotinib. Results We enrolled 34 patients; 11 patients (32%) had brain metastases at study entry. We observed 3 dose-limiting toxicities in dose escalation: transaminitis, mucositis, and rash. The MTD was erlotinib 1200 mg days 1-2 and 50 mg days 3-7 weekly. The most frequent toxicities (any grade) were rash, diarrhea, nausea, fatigue, and mucositis. 1 complete and 24 partial responses were observed (74%, 95% CI 60-84%). Median progression-free survival was 9.9 months (95% CI 5.8-15.4 months). No patient had progression of an untreated CNS metastasis or developed a new CNS lesion while on study (0%, 95% CI 0-13%). Of the 18 patients with biopsies at progression, EGFR T790M was identified in 78% (95% CI 54-91%). Conclusion This is the first clinical implementation of an anti-cancer TKI regimen combining pulse and daily low-dose administration. This evolutionary modeling-based dosing schedule was well-tolerated but did not improve progression-free survival or prevent emergence of EGFR T790M, likely due to insufficient peak serum concentrations of erlotinib. This dosing schedule prevented progression of untreated or any new central nervous system metastases in all patients.
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Affiliation(s)
- H. A. Yu
- Thoracic Oncology Service, Division of Solid Tumor Oncology, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York
- Weill Cornell Medical College, New York
| | - C. Sima
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York
| | - D. Feldman
- Thoracic Oncology Service, Division of Solid Tumor Oncology, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York
| | - L. L. Liu
- Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA
| | - B. Vaitheesvaran
- Donald B. and Catherine C. Marron Cancer Metabolism Center, Sloan Kettering Institute, Sloan Kettering Cancer Center, New York
| | - J. Cross
- Donald B. and Catherine C. Marron Cancer Metabolism Center, Sloan Kettering Institute, Sloan Kettering Cancer Center, New York
| | - C. M. Rudin
- Thoracic Oncology Service, Division of Solid Tumor Oncology, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York
- Weill Cornell Medical College, New York
| | - M. G. Kris
- Thoracic Oncology Service, Division of Solid Tumor Oncology, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York
- Weill Cornell Medical College, New York
| | - W. Pao
- Department of Medicine, Vanderbilt-Ingram Cancer Center, Nashville, TN
| | - F. Michor
- Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA
| | - G. J. Riely
- Thoracic Oncology Service, Division of Solid Tumor Oncology, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York
- Weill Cornell Medical College, New York
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Fine N, Hassanpour S, Borenstein A, Sima C, Oveisi M, Scholey J, Cherney D, Glogauer M. Distinct Oral Neutrophil Subsets Define Health and Periodontal Disease States. J Dent Res 2016; 95:931-8. [PMID: 27270666 DOI: 10.1177/0022034516645564] [Citation(s) in RCA: 99] [Impact Index Per Article: 12.4] [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: 12/27/2022] Open
Abstract
Neutrophils exit the vasculature and swarm to sites of inflammation and infection. However, these cells are abundant in the healthy, inflammation-free human oral environment, suggesting a unique immune surveillance role within the periodontium. We hypothesize that neutrophils in the healthy oral cavity occur in an intermediary parainflammatory state that allows them to interact with and contain the oral microflora without eliciting a marked inflammatory response. Based on a high-throughput screen of neutrophil CD (cluster of differentiation) marker expression and a thorough literature review, we developed multicolor flow cytometry panels to determine the surface marker signatures of oral neutrophil subsets in periodontal health and disease. We define here 3 distinct neutrophil subsets: resting/naive circulatory neutrophils, parainflammatory neutrophils found in the healthy oral cavity, and proinflammatory neutrophils found in the oral cavity during chronic periodontal disease. Furthermore, parainflammatory neutrophils manifest as 2 distinct subpopulations-based on size, granularity, and expression of specific CD markers-and exhibit intermediate levels of activation as compared with the proinflammatory oral neutrophils. These intermediately activated parainflammatory populations occur in equal proportions in the healthy oral cavity, with a shift to one highly activated proinflammatory neutrophil population in chronic periodontal disease. This work is the first to identify and characterize oral parainflammatory neutrophils that interact with commensal biofilms without inducing an inflammatory response, thereby demonstrating that not all neutrophils trafficking through periodontal tissues are fully activated. In addition to establishing possible diagnostic and treatment monitoring biomarkers, this oral neutrophil phenotype model builds on existing literature suggesting that the healthy periodontium may be in a parainflammatory state.
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Affiliation(s)
- N Fine
- Department of Dentistry, Matrix Dynamics Group, University of Toronto, Toronto, Canada
| | - S Hassanpour
- Department of Dentistry, Matrix Dynamics Group, University of Toronto, Toronto, Canada
| | - A Borenstein
- Department of Dentistry, Matrix Dynamics Group, University of Toronto, Toronto, Canada
| | - C Sima
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, MA, USA Department of Oral Medicine Infection and Immunity, Harvard School of Dental Medicine, Boston, MA, USA
| | - M Oveisi
- Department of Dentistry, Matrix Dynamics Group, University of Toronto, Toronto, Canada
| | - J Scholey
- Division of Nephrology, Department of Medicine, University Health Network, Toronto, Canada
| | - D Cherney
- Division of Nephrology, Department of Medicine, University Health Network, Toronto, Canada
| | - M Glogauer
- Department of Dentistry, Matrix Dynamics Group, University of Toronto, Toronto, Canada
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Petrache Voicu SN, Dinu D, Sima C, Hermenean A, Ardelean A, Codrici E, Stan MS, Zărnescu O, Dinischiotu A. Silica Nanoparticles Induce Oxidative Stress and Autophagy but Not Apoptosis in the MRC-5 Cell Line. Int J Mol Sci 2015; 16:29398-416. [PMID: 26690408 PMCID: PMC4691114 DOI: 10.3390/ijms161226171] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 11/27/2015] [Accepted: 11/30/2015] [Indexed: 12/13/2022] Open
Abstract
This study evaluated the in vitro effects of 62.5 µg/mL silica nanoparticles (SiO2 NPs) on MRC-5 human lung fibroblast cells for 24, 48 and 72 h. The nanoparticles’ morphology, composition, and structure were investigated using high resolution transmission electron microscopy, selected area electron diffraction and X-ray diffraction. Our study showed a decreased cell viability and the induction of cellular oxidative stress as evidenced by an increased level of reactive oxygen species (ROS), carbonyl groups, and advanced oxidation protein products after 24, 48, and 72 h, as well as a decreased concentration of glutathione (GSH) and protein sulfhydryl groups. The protein expression of Hsp27, Hsp60, and Hsp90 decreased at all time intervals, while the level of protein Hsp70 remained unchanged during the exposure. Similarly, the expression of p53, MDM2 and Bcl-2 was significantly decreased for all time intervals, while the expression of Bax, a marker for apoptosis, was insignificantly downregulated. These results correlated with the increase of pro-caspase 3 expression. The role of autophagy in cellular response to SiO2 NPs was demonstrated by a fluorescence-labeled method and by an increased level of LC3-II/LC3-I ratio. Taken together, our data suggested that SiO2 NPs induced ROS-mediated autophagy in MRC-5 cells as a possible mechanism of cell survival.
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Affiliation(s)
- Sorina Nicoleta Petrache Voicu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania.
- Department of Experimental and Applied Biology, Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, Arad 310414, Romania.
| | - Diana Dinu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania.
| | - Cornelia Sima
- Laser Department, National Institute of Laser, Plasma and Radiation Physics, 409 Atomistilor, Bucharest-Magurele 077125, Romania.
| | - Anca Hermenean
- Department of Experimental and Applied Biology, Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, Arad 310414, Romania.
- Department of Histology, Faculty of Medicine, Pharmacy and Dentistry, Vasile Goldis Western University of Arad, 1 Feleacului, Arad 310396, Romania.
| | - Aurel Ardelean
- Department of Experimental and Applied Biology, Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, Arad 310414, Romania.
| | - Elena Codrici
- Biochemistry Proteomics Department, Victor Babes National Institute of Pathology, 99-101 Splaiul Independentei, Bucharest 050096, Romania.
| | - Miruna Silvia Stan
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania.
| | - Otilia Zărnescu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania.
| | - Anca Dinischiotu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania.
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Serban AI, Stanca L, Sima C, Staicu AC, Zarnescu O, Dinischiotu A. Complex responses to Si quantum dots accumulation in carp liver tissue: Beyond oxidative stress. Chem Biol Interact 2015; 239:56-66. [DOI: 10.1016/j.cbi.2015.06.015] [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] [Received: 03/12/2015] [Revised: 06/04/2015] [Accepted: 06/08/2015] [Indexed: 01/01/2023]
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Suzuki K, Ripley R, Rusch V, Park B, Adusumilli P, Huang J, Bains M, Downey R, Rizk N, Sima C, Jones D. O-025KRAS MUTATION PREDICTS WORSE OVERALL SURVIVAL IN CLINICAL STAGE IIIA LUNG ADENOCARCINOMA PATIENTS TREATED WITH INDUCTION CHEMOTHERAPY FOLLOWED BY SURGERY. Interact Cardiovasc Thorac Surg 2015. [DOI: 10.1093/icvts/ivv204.25] [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: 11/15/2022] Open
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Sarkaria I, Grosser R, Goldman D, Ghanie A, Sima C, Bains M, Adusumilli P, Rusch V, Jones D, Rizk N. F-123QUALITY OF LIFE AND PAIN OUTCOMES AFTER ROBOTIC-ASSISTED MINIMALLY INVASIVE OESOPHAGECTOMY AND OPEN OESOPHAGECTOMY: SHORT-TERM RESULTS OF A PROSPECTIVE TRIAL. Interact Cardiovasc Thorac Surg 2015. [DOI: 10.1093/icvts/ivv204.123] [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: 11/12/2022] Open
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Sima C, Cheng Q, Rautava J, Levesque C, Sherman P, Glogauer M. Identification of quantitative trait loci influencing inflammation-mediated alveolar bone loss: insights into polygenic inheritance of host-biofilm disequilibria in periodontitis. J Periodontal Res 2015; 51:237-49. [PMID: 26126603 DOI: 10.1111/jre.12303] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/17/2015] [Indexed: 12/15/2022]
Abstract
BACKGROUND AND OBJECTIVE The relative contribution of genetic and environmental factors to the onset and progression of periodontitis is inconclusive. Despite the high prevalence, phenotypic heterogeneity and significant local and systemic implications of this disease, early detection and individualized therapy are problematic. Using a murine model of periodontitis in a panel of 17 recombinant inbred mice, the current study addressed the heritability of, and oral dysbiosis associated with, inflammation-mediated alveolar bone loss (iABL), the hallmark of periodontitis. MATERIAL AND METHODS Quantitative trait locus (QTL) genomics and quantitative PCR for over 99% of known murine oral microbiota were used. RESULTS It was found that iABL is a polygenic trait with 32.7% heritability. One suggestive QTL, nicknamed inflammation-mediated alveolar bone loss locus (iABLL), was identified on chromosome 2. Eleven genes involved in innate immune responses and bone metabolism, particularly related to macrophage and osteoblast function, namely Etl4, Pdss1, Cobll1, 9330158F14Rik, Xirp2, Stk39, Mettl5, Metapl1, Itga6, Pdk1 and Sp3, were found in the iABLL using cis expression QTL and nonsynonymous single nucleotide polymorphism analyses. Specific oral microbiome shifts in saliva and tongue mucosa are associated with disease in this model. CONCLUSION Our results indicate that complex host-biofilm interactions generate pathogenic states that extend beyond subgingival biofilms and periodontal tissues. Although no temporal relationship between the onset of iABL and microbiome changes were established, our findings suggest that host factors may be responsible for pathogenic shifts in subgingival biofilms when persistent and undisturbed.
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Affiliation(s)
- C Sima
- Department of Applied Oral Sciences, The Forsyth Institute, Cambridge, MA, USA.,Department of Oral Medicine, Infection, and Immunity, Harvard School of Dental Medicine, Boston, MA, USA.,Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - Q Cheng
- Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - J Rautava
- Department of Oral Pathology and Oral Radiology, Institute of Dentistry, University of Turku, Turku, Finland.,Cell Biology Program, Research Institute, Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - C Levesque
- Department of Oral Microbiology, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - P Sherman
- Cell Biology Program, Research Institute, Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - M Glogauer
- Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
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Stan MS, Sima C, Cinteza LO, Dinischiotu A. Silicon-based quantum dots induce inflammation in human lung cells and disrupt extracellular matrix homeostasis. FEBS J 2015; 282:2914-29. [PMID: 26032556 DOI: 10.1111/febs.13330] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 05/11/2015] [Accepted: 05/27/2015] [Indexed: 12/12/2022]
Abstract
Quantum dots (QDs) are nanocrystalline semiconductor materials that have been tested for biological applications such as cancer therapy, cellular imaging and drug delivery, despite the serious lack of information of their effects on mammalian cells. The present study aimed to evaluate the potential of Si/SiO2 QDs to induce an inflammatory response in MRC-5 human lung fibroblasts. Cells were exposed to different concentrations of Si/SiO2 QDs (25-200 μg·mL(-1)) for 24, 48, 72 and 96 h. The results obtained showed that uptake of QDs was dependent on biocorona formation and the stability of nanoparticles in various biological media (minimum essential medium without or with 10% fetal bovine serum). The cell membrane damage indicated by the increase in lactate dehydrogenase release after exposure to QDs was dose- and time-dependent. The level of lysosomes increased proportionally with the concentration of QDs, whereas an accumulation of autophagosomes was also observed. Cellular morphology was affected, as shown by the disruption of actin filaments. The enhanced release of nitric oxide and the increase in interleukin-6 and interleukin-8 protein expression suggested that nanoparticles triggered an inflammatory response in MRC-5 cells. QDs decreased the protein expression and enzymatic activity of matrix metalloproteinase (MMP)-2 and MMP-9 and also MMP-1 caseinase activity, whereas the protein levels of MMP-1 and tissue inhibitor of metalloproteinase-1 increased. The present study reveals for the first time that silicon-based QDs are able to generate inflammation in lung cells and cause an imbalance in extracellular matrix turnover through a differential regulation of MMPs and tissue inhibitor of metalloproteinase-1 protein expression.
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Affiliation(s)
- Miruna-Silvia Stan
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, Romania
| | - Cornelia Sima
- National Institute for Laser, Plasma and Radiation Physics, Bucharest-Magurele, Romania
| | | | - Anca Dinischiotu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, Romania
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Radu M, Dinu D, Sima C, Burlacu R, Hermenean A, Ardelean A, Dinischiotu A. Magnetite nanoparticles induced adaptive mechanisms counteract cell death in human pulmonary fibroblasts. Toxicol In Vitro 2015; 29:1492-502. [PMID: 26065626 DOI: 10.1016/j.tiv.2015.06.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 05/28/2015] [Accepted: 06/04/2015] [Indexed: 01/22/2023]
Abstract
Magnetite nanoparticles (MNP) have attracted great interest for biomedical applications due to their unique chemical and physical properties, but the MNP impact on human health is not fully known. Consequently, our study proposes to highlight the biochemical mechanisms that underline the toxic effects of MNP on a human lung fibroblast cell line (MRC-5). The cytotoxicity generated by MNP in MRC-5 cells was dose and time-dependent. MNP-treated MRC-5 cells accumulated large amount of iron and reactive oxygen species (ROS) and exhibited elevated antioxidant scavenger enzymes. Reduced glutathione (GSH) depletion and enhanced lipid peroxidation (LPO) processes were also observed. The cellular capacity to counteract the oxidative damage was sustained by high levels of heat shock protein 60 (Hsp60), a protein that confers resistance against ROS attack and inhibition of cell death. While significant augmentations in nitric oxide (NO) and prostaglandine E2 (PGE2) levels were detected after 72 h of MNP-exposure only, caspase-1 was activated earlier starting with 24h post-treatment. Taken together, our results suggest that MRC-5 cells have the capacity to develop cell protection mechanisms against MNP. Detailed knowledge of the mechanisms induced by MNP in cell culture could be essential for their prospective use in various in vivo biochemical applications.
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Affiliation(s)
- Mihaela Radu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania; Department of Histology, Faculty of Medicine, Pharmacy and Dentistry, Vasile Goldis Western University of Arad, 1 Feleacului, Arad 310396, Romania
| | - Diana Dinu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania
| | - Cornelia Sima
- Laser Department, National Institute of Laser, Plasma and Radiation Physics, 409 Atomistilor, Bucharest-Magurele 077125, Romania
| | - Radu Burlacu
- Department of Mathematics, University of Agriculture Sciences and Veterinary Medicine, 59 Marasti, Bucharest 011464, Romania
| | - Anca Hermenean
- Department of Histology, Faculty of Medicine, Pharmacy and Dentistry, Vasile Goldis Western University of Arad, 1 Feleacului, Arad 310396, Romania; Department of Experimental and Applied Biology, Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, Arad 310414, Romania
| | - Aurel Ardelean
- Department of Experimental and Applied Biology, Institute of Life Sciences, Vasile Goldis Western University of Arad, 86 Rebreanu, Arad 310414, Romania
| | - Anca Dinischiotu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania.
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Stan MS, Badea S, Sima C, Cinteza O, Dinischiotu A. Characterization of silicon-based quantum dots behaviour in various biological media. Toxicol Lett 2014. [DOI: 10.1016/j.toxlet.2014.06.671] [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: 11/29/2022]
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Stan MS, Memet I, Sima C, Popescu T, Teodorescu VS, Hermenean A, Dinischiotu A. Si/SiO2 quantum dots cause cytotoxicity in lung cells through redox homeostasis imbalance. Chem Biol Interact 2014; 220:102-15. [DOI: 10.1016/j.cbi.2014.06.020] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Revised: 06/05/2014] [Accepted: 06/19/2014] [Indexed: 11/16/2022]
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Sima C, Gates JC, Rogers HL, Mennea PL, Holmes C, Zervas MN, Smith PGR. Ultra-wide detuning planar Bragg grating fabrication technique based on direct UV grating writing with electro-optic phase modulation. Opt Express 2013; 21:15747-15754. [PMID: 23842361 DOI: 10.1364/oe.21.015747] [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: 06/02/2023]
Abstract
A direct UV grating writing technique based on phase-controlled interferometry is proposed and demonstrated in a silica-on-silicon platform, with a wider wavelength detuning range than any previously reported UV writing technology. Electro-optic phase modulation of one beam in the interferometer is used to manipulate the fringe pattern and thus control the parameters of the Bragg gratings and waveguides. Various grating structures with refractive index apodization, phase shifts and index contrasts of up to 0.8 × 10(-3) have been demonstrated. The method offers significant time/energy efficiency as well as simplified optical layout and fabrication process. We have shown Bragg gratings can be made from 1200 nm to 1900 nm exclusively under software control and the maximum peak grating reflectivity only decreases by 3 dBover a 250 nm (~32 THz) bandwidth.
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Affiliation(s)
- C Sima
- Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK.
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Stanca L, Petrache SN, Serban AI, Staicu AC, Sima C, Munteanu MC, Zărnescu O, Dinu D, Dinischiotu A. Interaction of silicon-based quantum dots with gibel carp liver: oxidative and structural modifications. Nanoscale Res Lett 2013; 8:254. [PMID: 23718202 PMCID: PMC3680243 DOI: 10.1186/1556-276x-8-254] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2013] [Accepted: 04/18/2013] [Indexed: 05/07/2023]
Abstract
Quantum dots (QDs) interaction with living organisms is of central interest due to their various biological and medical applications. One of the most important mechanisms proposed for various silicon nanoparticle-mediated toxicity is oxidative stress. We investigated the basic processes of cellular damage by oxidative stress and tissue injury following QD accumulation in the gibel carp liver after intraperitoneal injection of a single dose of 2 mg/kg body weight Si/SiO2 QDs after 1, 3, and 7 days from their administration.QDs gradual accumulation was highlighted by fluorescence microscopy, and subsequent histological changes in the hepatic tissue were noted. After 1 and 3 days, QD-treated fish showed an increased number of macrophage clusters and fibrosis, while hepatocyte basophilia and isolated hepatolytic microlesions were observed only after substantial QDs accumulation in the liver parenchyma, at 7 days after IP injection.Induction of oxidative stress in fish liver was revealed by the formation of malondialdehyde and advanced oxidation protein products, as well as a decrease in protein thiol groups and reduced glutathione levels. The liver enzymatic antioxidant defense was modulated to maintain the redox status in response to the changes initiated by Si/SiO2 QDs. So, catalase and glutathione peroxidase activities were upregulated starting from the first day after injection, while the activity of superoxide dismutase increased only after 7 days. The oxidative damage that still occurred may impair the activity of more sensitive enzymes. A significant inhibition in glucose-6-phosphate dehydrogenase and glutathione-S-transferase activity was noted, while glutathione reductase remained unaltered.Taking into account that the reduced glutathione level had a deep decline and the level of lipid peroxidation products remained highly increased in the time interval we studied, it appears that the liver antioxidant defense of Carassius gibelio does not counteract the oxidative stress induced 7 days after silicon-based QDs exposure in an efficient manner.
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Affiliation(s)
- Loredana Stanca
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest, 050095, Romania
| | - Sorina Nicoleta Petrache
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest, 050095, Romania
| | - Andreea Iren Serban
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest, 050095, Romania
- Department of Preclinical Sciences, University of Agricultural Sciences and Veterinary Medicine, 105 Splaiul Independentei, Bucharest, 050097, Romania
| | - Andrea Cristina Staicu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest, 050095, Romania
| | - Cornelia Sima
- Laser Department, National Institute of Laser, Plasma and Radiation Physics, 409 Atomistilor, Bucharest-Magurele, 077125, Romania
| | - Maria Cristina Munteanu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest, 050095, Romania
| | - Otilia Zărnescu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest, 050095, Romania
| | - Diana Dinu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest, 050095, Romania
| | - Anca Dinischiotu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest, 050095, Romania
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González-Pedro V, Sima C, Marzari G, Boix PP, Giménez S, Shen Q, Dittrich T, Mora-Seró I. High performance PbS Quantum Dot Sensitized Solar Cells exceeding 4% efficiency: the role of metal precursors in the electron injection and charge separation. Phys Chem Chem Phys 2013; 15:13835-43. [PMID: 23677043 DOI: 10.1039/c3cp51651b] [Citation(s) in RCA: 132] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Here we report the preparation of high performance Quantum Dot Sensitized Solar Cells (QDSCs) based on PbS-CdS co-sensitized nanoporous TiO2 electrodes. QDs were directly grown on the TiO2 mesostructure by the Successive Ionic Layer Absorption and Reaction (SILAR) technique. This method is characterized by a fast deposition rate which involves random crystal growth and poor control of the defect states and lattice mismatch in the QDs limiting the quality of the electrodes for photovoltaic applications. In this work we demonstrate that the nature of the metallic precursor selected for SILAR has an active role in both the QD's deposition rate and the defect's distribution in the material, with important consequences for the final photovoltaic performance of the device. For this purpose, acetate and nitrate salts were selected as metallic precursors for the SILAR deposition and films with similar absorption properties and consequently with similar density of photogenerated carriers were studied. Under these conditions, ultrafast carrier dynamics and surface photovoltage spectroscopy reveal that the use of acetate precursors leads to higher injection efficiency and lower internal recombination due to contribution from defect states. This was corroborated in a complete cell configuration with films sensitized with acetate precursors, achieving unprecedented photocurrents of ~22 mA cm(-2) and high power conversion efficiency exceeding 4%, under full 1 sun illumination.
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Affiliation(s)
- Victoria González-Pedro
- Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
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Trevisan R, Rodenas P, Gonzalez-Pedro V, Sima C, Sanchez RS, Barea EM, Mora-Sero I, Fabregat-Santiago F, Gimenez S. Harnessing Infrared Photons for Photoelectrochemical Hydrogen Generation. A PbS Quantum Dot Based "Quasi-Artificial Leaf". J Phys Chem Lett 2013; 4:141-6. [PMID: 26291226 DOI: 10.1021/jz301890m] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [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: 05/21/2023]
Abstract
Hydrogen generation by using quantum dot (QD) based heterostructures has emerged as a promising strategy to develop artificial photosynthesis devices. In the present study, we sensitize mesoporous TiO2 electrodes with in-situ-deposited PbS/CdS QDs, aiming at harvesting light in both the visible and the near-infrared for hydrogen generation. This heterostructure exhibits a remarkable photocurrent of 6 mA·cm(-2), leading to 60 mL·cm(-2)·day(-1) hydrogen generation. Most importantly, confirmation of the contribution of infrared photons to H2 generation was provided by the incident-photon-to-current-efficiency (IPCE), and the integrated current was in excellent agreement with that obtained through cyclic voltammetry. The main electronic processes (accumulation, transport, and recombination) were identified by impedance spectroscopy, which appears as a simple and reliable methodology to evaluate the limiting factors of these photoelectrodes. On the basis of this TiO2/PbS/CdS heterostructrure, a "quasi-artificial leaf" has been developed, which has proven to produce hydrogen under simulated solar illumination at (4.30 ± 0.25) mL·cm(-2)·day(-1).
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Affiliation(s)
- Roberto Trevisan
- †Photovoltaics and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
| | - Pau Rodenas
- †Photovoltaics and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
| | - Victoria Gonzalez-Pedro
- †Photovoltaics and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
| | - Cornelia Sima
- †Photovoltaics and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
- ‡National Institute of Lasers, Plasma and Radiation Physics, Atomistilor 409 Street, P.O. Box MG 36 Bucharest-Magurele, 077125 Romania
- §Faculty of Physics, University of Bucharest, Atomistilor 405 Street, MG-11 Bucharest-Magurele, 077125 Romania
| | - Rafael S Sanchez
- †Photovoltaics and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
| | - Eva M Barea
- †Photovoltaics and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
| | - Ivan Mora-Sero
- †Photovoltaics and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
| | - Francisco Fabregat-Santiago
- †Photovoltaics and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
| | - Sixto Gimenez
- †Photovoltaics and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
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Petrache SN, Stanca L, Serban AI, Sima C, Staicu AC, Munteanu MC, Costache M, Burlacu R, Zarnescu O, Dinischiotu A. Structural and oxidative changes in the kidney of crucian carp induced by silicon-based quantum dots. Int J Mol Sci 2012; 13:10193-10211. [PMID: 22949855 PMCID: PMC3431853 DOI: 10.3390/ijms130810193] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 07/28/2012] [Accepted: 08/09/2012] [Indexed: 11/16/2022] Open
Abstract
Silicon-based quantum dots were intraperitoneally injected in Carassius auratus gibelio specimens and, over one week, the effects on renal tissue were investigated by following their distribution and histological effects, as well as antioxidative system modifications. After three and seven days, detached epithelial cells from the basal lamina, dilated tubules and debris in the lumen of tubules were observed. At day 7, nephrogenesis was noticed. The reduced glutathione (GSH) concentration decreased in the first three days and started to rise later on. The superoxide dismutase (SOD) activity increased only after one week, whereas catalase (CAT) was up-regulated in a time-dependent manner. The activities of glutathione reductase (GR) and glutathione peroxidise (GPX) decreased dramatically by approximately 50% compared to control, whereas the glutathione-S-transferase (GST) and glucose-6-phosphate dehydrogenase (G6PDH) increased significantly after 3 and 7 days of treatment. Oxidative modifications of proteins and the time-dependent increase of Hsp70 expression were also registered. Our data suggest that silicon-based quantum dots induced oxidative stress followed by structural damages. However, renal tissue is capable of restoring its integrity by nephron development.
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Affiliation(s)
- Sorina Nicoleta Petrache
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania; E-Mails: (S.N.P.); (L.S.); (A.C.S.); (M.C.M.); (M.C.); (O.Z.)
| | - Loredana Stanca
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania; E-Mails: (S.N.P.); (L.S.); (A.C.S.); (M.C.M.); (M.C.); (O.Z.)
| | - Andreea Iren Serban
- Department of Preclinical Sciences, University of Agricultural Sciences and Veterinary Medicine, 105 Splaiul Independentei, Bucharest 050097, Romania; E-Mail:
| | - Cornelia Sima
- Laser Department, National Institute of Laser, Plasma and Radiation Physics, 409 Atomistilor, Bucharest-Magurele 077125, Romania; E-Mail:
| | - Andreia Cristina Staicu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania; E-Mails: (S.N.P.); (L.S.); (A.C.S.); (M.C.M.); (M.C.); (O.Z.)
| | - Maria Cristina Munteanu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania; E-Mails: (S.N.P.); (L.S.); (A.C.S.); (M.C.M.); (M.C.); (O.Z.)
| | - Marieta Costache
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania; E-Mails: (S.N.P.); (L.S.); (A.C.S.); (M.C.M.); (M.C.); (O.Z.)
| | - Radu Burlacu
- Department of Mathematics, University of Agricultural Sciences and Veterinary Medicine, 59 Marasti Bd., Bucharest 011464, Romania; E-Mail:
| | - Otilia Zarnescu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania; E-Mails: (S.N.P.); (L.S.); (A.C.S.); (M.C.M.); (M.C.); (O.Z.)
| | - Anca Dinischiotu
- Department of Biochemistry and Molecular Biology, University of Bucharest, 91-95 Splaiul Independentei, Bucharest 050095, Romania; E-Mails: (S.N.P.); (L.S.); (A.C.S.); (M.C.M.); (M.C.); (O.Z.)
- Author to whom correspondence should be addressed; E-Mail: or ; Tel./Fax: +40-21-318-1575 (ext. 103)
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Stanca L, Petrache SN, Radu M, Serban AI, Munteanu MC, Teodorescu D, Staicu AC, Sima C, Costache M, Grigoriu C, Zarnescu O, Dinischiotu A. Impact of silicon-based quantum dots on the antioxidative system in white muscle of Carassius auratus gibelio. Fish Physiol Biochem 2012; 38:963-975. [PMID: 22139144 DOI: 10.1007/s10695-011-9582-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Accepted: 11/22/2011] [Indexed: 05/31/2023]
Abstract
Silicon-based quantum dots were intraperitoneally injected in individuals of Carassius auratus gibelio. Their effects on white muscle were investigated by following their distribution and impact on the antioxidative system. The GSH level significantly increased after 1 and 3 days of exposure by, respectively, 85.3 and 25.4%. Seven days later, GSH levels were similar to control concentrations. MDA concentration rose after three days by 46.9% and remained at the same level after 7 days. Protein thiol levels significantly decreased by 6.7 and 8.1% after 3 and 7 days, whereas advanced oxidation protein products increased by 12.7, respectively, 28.1% in the same time intervals. The protein reactive carbonyl groups were raised only after the first day of exposure and returned to the control level later on. SOD specific activity increased up to 48% after 7 days, while CAT activity increased by 328, 176, and 26% after 1, 3, and 7 days of treatment. GST specific activity was up-regulated by 87, 18, and 9%, while GR activity increased by 68, 34, and 9%. G6PD activity was up-regulated by 12, 22, and 50%, whereas GPx activity raised by 75 and 109% compared to control after, respectively, 1, 3, and 7 days. Our results suggest that oxidative stress induced by silicon-based quantum dots was not strong enough to cause permanent damage in the white muscle of crucian carp.
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Affiliation(s)
- Loredana Stanca
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independetei, 050095, Bucharest, Romania
| | - Sorina Nicoleta Petrache
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independetei, 050095, Bucharest, Romania
| | - Mihaela Radu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independetei, 050095, Bucharest, Romania
| | - Andreea Iren Serban
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independetei, 050095, Bucharest, Romania
- Department of Preclinical Sciences, Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine, 105 Splaiul Independetei, 050097, Bucharest, Romania
| | - Maria Cristina Munteanu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independetei, 050095, Bucharest, Romania
| | - Daniela Teodorescu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independetei, 050095, Bucharest, Romania
| | - Andreea Cristina Staicu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independetei, 050095, Bucharest, Romania
| | - Cornelia Sima
- Laser Department, National Institute of Laser, Plasma and Radiation Physics, 409 Atomistilor, 077125, Bucharest-Magurele, Romania
| | - Marieta Costache
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independetei, 050095, Bucharest, Romania
| | - Constantin Grigoriu
- Laser Department, National Institute of Laser, Plasma and Radiation Physics, 409 Atomistilor, 077125, Bucharest-Magurele, Romania
| | - Otilia Zarnescu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independetei, 050095, Bucharest, Romania
| | - Anca Dinischiotu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independetei, 050095, Bucharest, Romania.
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Petrache S, Stanca L, Radu M, Serban A, Sima C, Zarnescu O, Costache M, Dinischiotu A. Modulation of oxidative status in the red muscle of Carassius auratus gibelio exposure to silicon quantum dots. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.766] [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: 11/30/2022]
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Sima C, Rhourida K, Van Dyke TE, Gyurko R. Type 1 diabetes predisposes to enhanced gingival leukocyte margination and macromolecule extravasation in vivo. J Periodontal Res 2011; 45:748-56. [PMID: 20682016 DOI: 10.1111/j.1600-0765.2010.01295.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND AND OBJECTIVE Diabetes predisposes to periodontal disease. However, the cellular and molecular mechanisms linking the two conditions are not clear. The impact of chronic hyperglycemia on leukocyte margination and macromolecule extravasation was determined in gingival vessels in vivo. MATERIALS AND METHODS Gingival intravital microscopy was employed to measure extravasation of fluorescein isothiocyanate (FITC)-dextran in diabetic Akita and healthy wild-type (WT) mice. Rhodamine 6G and FITC-LY6G were injected for nonspecific and polymorphonuclear-specific leukocyte labeling, respectively. Surface expression of leukocyte adhesion molecules was determined with flow cytometry and western blotting. RESULTS Vascular permeability was significantly increased in Akita gingival vessels compared with WT [permeability index (PI): WT, 0.75 ± 0.05; Akita, 1.1 ± 0.03: p < 0.05). Wild-type gingival vessels reached comparable permeability 2 h after intragingival injection of tumor necrosis factor α (TNFα), used here as positive control (PI, 1.17 ± 0.16). The number of rolling leukocytes was significantly elevated in diabetic gingiva (WT, 25 ± 3.7 cells/min; Akita, 42 ± 8.5 cells/min; p < 0.03). Similar rolling cell counts were obtained in WT after intragingival injection of TNFα (10 ng TNFα, 47 ± 1.3 cells/min; 100 ng TNFα, 57.5 ± 5.85 cells/min). The number of leukocytes firmly attached to the endothelium was similar in WT and Akita mice. Leukocyte cell-surface expression of P-selectin glycoprotein ligand-1 and CD11a was increased in Akita mice, while L-selectin remained unchanged when compared with WT. Moreover, P-selectin expression in Akita gingival tissues was elevated compared with that of WT. CONCLUSION Chronic hyperglycemia induces a proinflammatory state in the gingival microcirculation characterized by increased vascular permeability, and leukocyte and endothelial cell activation. Leukocyte-induced microvascular damage, in turn, may contribute to periodontal tissue damage in diabetes.
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Affiliation(s)
- C Sima
- Department of Periodontology and Oral Biology, Goldman School of Dental Medicine, Boston University, Boston, MA, USA
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Radu M, Munteanu MC, Petrache S, Serban AI, Dinu D, Hermenean A, Sima C, Dinischiotu A. Depletion of intracellular glutathione and increased lipid peroxidation mediate cytotoxicity of hematite nanoparticles in MRC-5 cells. Acta Biochim Pol 2010. [DOI: 10.18388/abp.2010_2416] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Particles generated from numerous anthropogenic and/or natural sources, such as crystalline α-Fe₂O₃ nanoparticles, have the potential to damage lung cells. In our study we investigated the effects of these nanoparticles (12.5 µg/ml) on lipid peroxidation and the antioxidative system in MRC-5 lung fibroblast cells following exposure for 24, 48 or 72h. Exposure to α-Fe₂O₃ nanoparticles increased lipid peroxidation by 81%, 189% and 110% after 24, 48 and 72h, respectively. Conversely, the reduced glutathione concentration decreased by 23.2% and 51.4% after 48 and 72h of treatment, respectively. In addition, an augmentation of the activities of superoxide dismutase, catalase, glutathione peroxidase, glutathione transferase and glutathione reductase within the interval between 48-72h was noticed. Taking into account that the reduced glutathione level decreased and the malondialdehyde level, a lipid peroxidation product, remained highly increased up to 72h of exposure, it would appear that the MRC-5 antioxidant defense mechanisms did not efficiently counteract the oxidative stress induced by exposure to hematite nanoparticles.
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Radu M, Munteanu MC, Petrache S, Serban AI, Dinu D, Hermenean A, Sima C, Dinischiotu A. Depletion of intracellular glutathione and increased lipid peroxidation mediate cytotoxicity of hematite nanoparticles in MRC-5 cells. Acta Biochim Pol 2010; 57:355-360. [PMID: 20835408] [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] [Received: 03/08/2010] [Revised: 06/26/2010] [Accepted: 08/16/2010] [Indexed: 05/29/2023]
Abstract
Particles generated from numerous anthropogenic and/or natural sources, such as crystalline α-Fe₂O₃ nanoparticles, have the potential to damage lung cells. In our study we investigated the effects of these nanoparticles (12.5 µg/ml) on lipid peroxidation and the antioxidative system in MRC-5 lung fibroblast cells following exposure for 24, 48 or 72h. Exposure to α-Fe₂O₃ nanoparticles increased lipid peroxidation by 81%, 189% and 110% after 24, 48 and 72h, respectively. Conversely, the reduced glutathione concentration decreased by 23.2% and 51.4% after 48 and 72h of treatment, respectively. In addition, an augmentation of the activities of superoxide dismutase, catalase, glutathione peroxidase, glutathione transferase and glutathione reductase within the interval between 48-72h was noticed. Taking into account that the reduced glutathione level decreased and the malondialdehyde level, a lipid peroxidation product, remained highly increased up to 72h of exposure, it would appear that the MRC-5 antioxidant defense mechanisms did not efficiently counteract the oxidative stress induced by exposure to hematite nanoparticles.
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Affiliation(s)
- Mihaela Radu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, Bucharest, Romania
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Johnson ML, Sima C, Paik PK, Janjigian YY, Pao W, Kris MG, Ladanyi M, Riely GJ. Association of KRAS and EGFR mutations with survival in patients with advanced lung adenocarcinoma. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.7541] [Citation(s) in RCA: 2] [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: 11/20/2022] Open
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Lou E, Johnson ML, Sima C, Gonzalez-Espinoza R, Kris MG, Azzoli CG, Fleisher M. Analysis of a panel of serum biomarkers in patients with metastatic lung cancer. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e18080] [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: 11/20/2022] Open
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Becher OJ, Trippett TM, Kolesar J, Gilheeney S, Jiang Z, Khakoo Y, Lyden D, Sima C, Holland EC, Dunkel IJ. Phase I study of single-agent perifosine for recurrent pediatric solid tumors. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.9540] [Citation(s) in RCA: 2] [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: 11/20/2022] Open
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D'Angelo SP, Janjigian YY, Kris MG, Pao W, Riely GJ, Marks J, Sima C, Dycoco J, Park BJ, Azzoli CG. Impact of EGFR and KRAS mutations on survival in 1,000 patients with resected lung adenocarcinoma. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.7011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Paik PK, Johnson ML, D'Angelo SP, Sima C, Janjigian YY, Riely GJ, Kris MG. Prognostic implications of mutations in the epidermal growth factor receptor (EGFR) and KRAS among never-smokers with adenocarcinoma of the lung. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.10530] [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: 11/20/2022] Open
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Hensley ML, Kravetz S, Sima C, Tew W, Pereira L, Sabbatini P, Whalen C, Aghajanian CA, Zarwan C, Berlin S. Eribulin mesylate (halichondrin B Analog E7389) in platinum-resistant epithelial ovarian cancer (PR-EOC): A CTEP-sponsored phase II study. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.5561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
5561 Background: Eribulin mesylate is a tubulin inhibitor whose mechanism of action differs from that of other anti-tubulin agents, suppressing microtubule growth without affecting depolymerization, and sequestering tubulin into non-functional aggregates. In NIH:OVCAR-3 human EOC xenograft models, eribulin increased survival and reduced size and number of metastases, with activity superior to paclitaxel. We sought to determine the frequency of objective response to treatment with eribulin in patients (pts) with PR-EOC. Methods: Pts with PR-EOC, fallopian tube or peritoneal cancer (progression-free interval from last platinum-based therapy < 6 months), measurable disease, < 2 prior cytotoxic regimens, ECOG performance status 0–1, and adequate organ function were eligible. Treatment: eribulin 1.4 mg/m2 over 15 minutes IV days 1 and 8, every 21 days. Response assessed by CT for RECIST every other cycle. Results: 36 pts (median age 61, range 38–80; median platinum-free interval 3 months, range 0.1–5.9; all having received platinum-taxane first-line treatment) enrolled. 35 are evaluable for response (1 pt off-study for unrelated myocardial infarction in cycle 1). Two pts achieved partial responses (PR-5.7%), with response durations of 84 days and 128 days. Time to PR was 2.8 months in both. >50% decrease in CA125 for more than two measurements was observed in 3/31 CA125-evaluable pts. 16/35 (46%) had stable disease as best response. Median progression-free survival was 2 months (range 1–7 months). Per patient, at least possibly-related grade 3–4 toxicities were: neutropenia 44%, leucopenia 31%, anemia 3%, lymphopenia 3%, febrile neutropenia 3%, muscle weakness 3%, hypophosphatemia 3%, hypokalemia 6%, infection 6%, thrombosis 6%. Conclusions: Eribulin has minimal activity in PR-EOC with objective response observed in only 5.7% of pts. Time to objective response was nearly 3 months. Median PFS was 2 months. Activity of eribulin in platinum-sensitive patients is being studied in a separate phase II cohort. [Table: see text]
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Affiliation(s)
- M. L. Hensley
- Memorial Sloan-Kettering Cancer Center, New York, NY; Dana-Farber Cancer Institute, Boston, MA; Lahey Clinic, Boston, MA
| | - S. Kravetz
- Memorial Sloan-Kettering Cancer Center, New York, NY; Dana-Farber Cancer Institute, Boston, MA; Lahey Clinic, Boston, MA
| | - C. Sima
- Memorial Sloan-Kettering Cancer Center, New York, NY; Dana-Farber Cancer Institute, Boston, MA; Lahey Clinic, Boston, MA
| | - W. Tew
- Memorial Sloan-Kettering Cancer Center, New York, NY; Dana-Farber Cancer Institute, Boston, MA; Lahey Clinic, Boston, MA
| | - L. Pereira
- Memorial Sloan-Kettering Cancer Center, New York, NY; Dana-Farber Cancer Institute, Boston, MA; Lahey Clinic, Boston, MA
| | - P. Sabbatini
- Memorial Sloan-Kettering Cancer Center, New York, NY; Dana-Farber Cancer Institute, Boston, MA; Lahey Clinic, Boston, MA
| | - C. Whalen
- Memorial Sloan-Kettering Cancer Center, New York, NY; Dana-Farber Cancer Institute, Boston, MA; Lahey Clinic, Boston, MA
| | - C. A. Aghajanian
- Memorial Sloan-Kettering Cancer Center, New York, NY; Dana-Farber Cancer Institute, Boston, MA; Lahey Clinic, Boston, MA
| | - C. Zarwan
- Memorial Sloan-Kettering Cancer Center, New York, NY; Dana-Farber Cancer Institute, Boston, MA; Lahey Clinic, Boston, MA
| | - S. Berlin
- Memorial Sloan-Kettering Cancer Center, New York, NY; Dana-Farber Cancer Institute, Boston, MA; Lahey Clinic, Boston, MA
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Sima C, Raman R, Reddy R, Hunt W, Reddy S. Vital signs services for secure telemedicine applications. Proc AMIA Symp 1998:361-5. [PMID: 9929242 PMCID: PMC2232385] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023] Open
Abstract
Telemedicine using teleconference provides only a part of the picture. The remote patient's electronic medical record and vital signs may often be essential for proper diagnosis and treatment. While there are commercial solutions for telemonitoring, they do not address issues such as security and interoperability leveraging the growing public communications infrastructure. On the other hand there are performance considerations due to the quality of service over available communications media that can hinder real-time operation. The objective of this research effort is to develop secure tele-monitoring facilities that enable healthcare providers to collaborate over public communication networks; to securely convey their patient's vital signs to a remote specialist; and to enable "near real-time" examination of those vital sign data. It is our belief that such applications can help overcome barriers to quality healthcare in the scattered populations of rural areas enabling telemedicine to be a part of the practice of medicine. The authors, who are developing secure telemedicine applications, describe their approach in developing secure vital signs services.
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Affiliation(s)
- C Sima
- Concurrent Engineering Research Center, West Virginia University, Morgantown 26506-6506, USA
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