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1.
BMC Cardiovasc Disord ; 23(1): 366, 2023 07 21.
Artigo em Inglês | MEDLINE | ID: mdl-37479968

RESUMO

BACKGROUND: Dyslipidemia is one of the important contributors to cardiovascular disease and type 2 diabetes. There is little or no information on dyslipidemia among academic staff and students in Bangladesh. Therefore, this study aimed to investigate the prevalence and factors related to dyslipidemia among university academic staff and students in Bangladesh. METHODS: A total of 533 participants (302 academic staff and 231 students) were enrolled in this cross-sectional study. A simple random sampling technique was used to enrol the participants. Fasting blood samples were obtained from the participants, and serum levels of triglycerides (TG), total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C) were measured using the standard methods. Dyslipidemia was defined according to the National Cholesterol Education Program Adult Treatment Panel III (NCEP-ATP-III) model guideline. Multivariable logistic regression was conducted to identify the factors related to lipid marker abnormalities. RESULTS: Overall, the prevalence of dyslipidemia was 81.5%, of which 85% was in staff and 76.5% in students. A significant difference was found in the prevalence of dyslipidemia between males and females only in the student group (p < 0.01). Among staff, hypertriglyceridemia prevalence was 49.7%, hypercholesterolemia 23%, high LDL-C 24.7% and low HDL-C 77.3%. On the other hand, hypertriglyceridemia prevalence was 39%, hypercholesterolemia 25.6%, high LDL-C 26.5% and low HDL-C 69.3% among students. The most common lipid abnormality was low HDL-C in both groups. The prevalence of mixed dyslipidemia was 14.2% and 14.1% in staff and students, respectively. According to the regression analysis, increased age, obesity, diabetes, and inadequate physical activity were significantly associated with dyslipidemia. CONCLUSIONS: Dyslipidemia was prevalent among the majority of the study participants. Increased age, obesity, diabetes, and inadequate physical activity were significantly associated with dyslipidemia. The study's results highlight the importance of implementing interventions to address the associated risk factors of dyslipidemia among academic staff and students in Bangladesh.


Assuntos
Diabetes Mellitus Tipo 2 , Dislipidemias , Hipercolesterolemia , Hipertrigliceridemia , Adulto , Masculino , Feminino , Humanos , Hipercolesterolemia/epidemiologia , LDL-Colesterol , Prevalência , Bangladesh/epidemiologia , Estudos Transversais , Universidades , Dislipidemias/diagnóstico , Dislipidemias/epidemiologia , Colesterol , Triglicerídeos , Fatores de Risco , Obesidade/epidemiologia , HDL-Colesterol , Hipertrigliceridemia/epidemiologia , Estudantes
2.
BMC Cancer ; 21(1): 808, 2021 Jul 13.
Artigo em Inglês | MEDLINE | ID: mdl-34256732

RESUMO

BACKGROUND: Though the gut microbiome has been associated with efficacy of immunotherapy (ICI) in certain cancers, similar findings have not been identified for microbiomes from other body sites and their correlation to treatment response and immune related adverse events (irAEs) in lung cancer (LC) patients receiving ICIs. METHODS: We designed a prospective cohort study conducted from 2018 to 2020 at a single-center academic institution to assess for correlations between the microbiome in various body sites with treatment response and development of irAEs in LC patients treated with ICIs. Patients must have had measurable disease, ECOG 0-2, and good organ function to be included. Data was collected for analysis from January 2019 to October 2020. Patients with histopathologically confirmed, advanced/metastatic LC planned to undergo immunotherapy-based treatment were enrolled between September 2018 and June 2019. Nasal, buccal and gut microbiome samples were obtained prior to initiation of immunotherapy +/- chemotherapy, at development of adverse events (irAEs), and at improvement of irAEs to grade 1 or less. RESULTS: Thirty-seven patients were enrolled, and 34 patients were evaluable for this report. 32 healthy controls (HC) from the same geographic region were included to compare baseline gut microbiota. Compared to HC, LC gut microbiota exhibited significantly lower α-diversity. The gut microbiome of patients who did not suffer irAEs were found to have relative enrichment of Bifidobacterium (p = 0.001) and Desulfovibrio (p = 0.0002). Responders to combined chemoimmunotherapy exhibited increased Clostridiales (p = 0.018) but reduced Rikenellaceae (p = 0.016). In responders to chemoimmunotherapy we also observed enrichment of Finegoldia in nasal microbiome, and increased Megasphaera but reduced Actinobacillus in buccal samples. Longitudinal samples exhibited a trend of α-diversity and certain microbial changes during the development and resolution of irAEs. CONCLUSIONS: This pilot study identifies significant differences in the gut microbiome between HC and LC patients, and their correlation to treatment response and irAEs in LC. In addition, it suggests potential predictive utility in nasal and buccal microbiomes, warranting further validation with a larger cohort and mechanistic dissection using preclinical models. TRIAL REGISTRATION: ClinicalTrials.gov, NCT03688347 . Retrospectively registered 09/28/2018.


Assuntos
Microbioma Gastrointestinal/fisiologia , Imunoterapia/métodos , Neoplasias Pulmonares/tratamento farmacológico , Feminino , Humanos , Masculino , Projetos Piloto , Estudos Prospectivos
3.
Postgrad Med J ; 95(1122): 205-209, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31097576

RESUMO

PURPOSE: Implantable cardioverter defibrillator (ICD) implantation rates remain variable despite established guideline recommendations. This study aims to assess whether being managed by a cardiologist has an impact on whether patients are considered for an ICD for primary prevention of sudden cardiac death. DESIGN/METHODS: Single-centre, retrospective, observational study of patients identified to have severe left ventricular systolic dysfunction (LVSD) on echocardiography (n = 129) between 1 and 30 June 2016 with cross-sectional assessment at 1 year. An assessment of ICD consideration at 1 year following the echocardiogram was documented, in addition to the specialty of the managing physician (group 1-electrophysiologist/heart failure specialist; group 2-all other cardiologists; group 3-non-cardiologist). RESULTS: 129/1173 (11%) transthoracic echocardiographies (s) were identified to have severe LVSD. 52 (40%), 37 (29%) and 40 (31%) were managed by group 1, group 2 and group 3, respectively. Mean age was 74.7 (±12.6) years with a predominance of male gender (70.5%). An ICD was not considered in 47.3%. Those managed by a cardiologist were more likely to be considered for an ICD than a non-cardiologist (63.9% vs 30.0%; OR 4.0, 95% CI 1.8 to 8.8, p = 0.001) with a greater survival at 1 year (89.9% vs 52.5%, OR 8.1 95% CI 3.2 to 20.4, p < 0.001). Group 1 were more likely to consider ICD than group 2 cardiologists (75.0% vs 45.9%; OR 3.5; 95% CI 1.4 to 8.7, p = 0.005). CONCLUSION: There is significant variation between cardiologists and non-cardiologists, as well as within different cardiology subspecialists, when considering the option of ICD therapy for primary prevention.


Assuntos
Morte Súbita Cardíaca/prevenção & controle , Desfibriladores Implantáveis , Padrões de Prática Médica/estatística & dados numéricos , Prevenção Primária , Especialização/estatística & dados numéricos , Adulto , Idoso , Idoso de 80 Anos ou mais , Estudos Transversais , Ecocardiografia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos
4.
Nanotechnology ; 28(18): 185403, 2017 May 05.
Artigo em Inglês | MEDLINE | ID: mdl-28397707

RESUMO

Ocean waves are one of the cleanest and most abundant energy sources on earth, and wave energy has the potential for future power generation. Triboelectric nanogenerator (TENG) technology has recently been proposed as a promising technology to harvest wave energy. In this paper, a theoretical study is performed on a duck-shaped TENG wave harvester recently introduced in our work. To enhance the design of the duck-shaped TENG wave harvester, the mechanical and electrical characteristics of the harvester's overall structure, as well as its inner configuration, are analyzed, respectively, under different wave conditions, to optimize parameters such as duck radius and mass. Furthermore, a comprehensive hybrid 3D model is introduced to quantify the performance of the TENG wave harvester. Finally, the influence of different TENG parameters is validated by comparing the performance of several existing TENG wave harvesters. This study can be applied as a guideline for enhancing the performance of TENG wave energy harvesters.

5.
Angew Chem Int Ed Engl ; 54(35): 10313-6, 2015 Aug 24.
Artigo em Inglês | MEDLINE | ID: mdl-26110718

RESUMO

Targeting and stabilizing distinct kinase conformations is an instrumental strategy for dissecting conformation-dependent signaling of protein kinases. Herein the structure-based design, synthesis, and evaluation of pleckstrin homology (PH) domain-dependent covalent-allosteric inhibitors (CAIs) of the kinase Akt is reported. These inhibitors bind covalently to a distinct cysteine of the kinase and thereby stabilize the inactive kinase conformation. These modulators exhibit high potency and selectivity, and represent an innovative approach for chemical biology and medicinal chemistry research.


Assuntos
Inibidores de Proteínas Quinases/farmacologia , Proteínas Proto-Oncogênicas c-akt/antagonistas & inibidores , Transdução de Sinais/efeitos dos fármacos , Trifosfato de Adenosina/metabolismo , Regulação Alostérica , Ligação Competitiva , Humanos , Modelos Moleculares
6.
Endocrinol Diabetes Metab ; 7(4): e00491, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38853495

RESUMO

OBJECTIVES: Metabolic syndrome (MetS) is a group of medical conditions that elevate the chances of developing cardiovascular disease, stroke and Type 2 diabetes. This study aimed to determine the frequency and contributing risk factors of MetS in adults from Bangladesh. METHODS: In this cross-sectional study, 653 individuals (470 males and 183 females) were randomly selected to participate. Fasting blood samples were collected and analysed using standard methods to measure biochemical parameters. MetS was defined on the basis of NCEP-ATP III guidelines, and multivariate logistic regression analyses were conducted to identify factors associated with MetS. RESULTS: The prevalence of MetS was 19.7% in the healthy control group, 70.2% in the hypertensive group and 46.8% in the diabetic group. Overall, there was no significant difference in the prevalence of MetS between males (45%) and females (45.9%). The participants who had both hypertension and diabetes had the highest prevalence of MetS at 77.3%. Both males and females showed an increased trend in the prevalence of MetS and its components as they aged, except for WC in males (p < 0.01 for all cases). The 46-55 age group in males had a higher prevalence of MetS (68%), whereas the >55 age group in females had a prevalence of 73.9%. The most common component of MetS was low levels of HDL-C, which affected over 80% of the studied sample. According to the logistic regression analyses, age, BMI, hypertension and diabetes were significantly associated with MetS in both genders. CONCLUSION: This study found a high prevalence of MetS in Bangladeshi adults. Several factors are significantly associated with the risk of MetS. It is crucial to consider the varying prevalence rates of MetS by age and gender as well as its different components while providing health guidance and support.


Assuntos
Hipertensão , Síndrome Metabólica , Humanos , Masculino , Feminino , Bangladesh/epidemiologia , Síndrome Metabólica/epidemiologia , Síndrome Metabólica/etiologia , Estudos Transversais , Pessoa de Meia-Idade , Adulto , Prevalência , Fatores de Risco , Hipertensão/epidemiologia , Idoso , Adulto Jovem
7.
Sci Rep ; 13(1): 19912, 2023 11 14.
Artigo em Inglês | MEDLINE | ID: mdl-37963996

RESUMO

Metabolic syndrome (MetS) is a group of medical conditions that increase the risk of cardiovascular disease, stroke, and type 2 diabetes. While there are numerous studies on the prevalence of MetS in the general adult population worldwide, limited information exists regarding its prevalence among university students and academic staff. This study aimed to determine the prevalence of MetS and associated risk factors among Bangladesh university students and academic staff. For this cross-sectional study, 583 participants were randomly selected from university students (n = 281) and academic staff (n = 302) in Bangladesh. The participants' fasting blood samples were collected, and their serum lipid profile levels, fasting blood glucose, and other parameters were measured using standard methods. MetS was defined according to the NCEP-ATP III model guidelines. Additionally, a questionnaire was administered to the participants to gather information on socio-demographics, lifestyle risk behaviours, and personal medical history. Multivariate logistic regression models were used to determine the risk factors associated with MetS. Overall, the prevalence of MetS was 27.7% in students and 47.7% in staff. There was a significant difference (p < 0.01) in MetS prevalence between male students (34.8%) and female students (17.2%). In contrast, it was comparatively higher in female staff (52.3%) than in male staff (45.8%), although the difference was not statistically significant. The prevalence of MetS and its components increased with age in student and staff groups. The most common component of MetS was low levels of HDL-C, which affected 78% and 81.4% of the students and staff, respectively. Logistic regression modelling showed that increased age, BMI, hypertension, dyslipidemia, low physical activity, and smoking were significantly associated with MetS in students (at least p < 0.05 for all cases). On the other hand, increased age and BMI, hypertension, and dyslipidemia were significantly associated with MetS in academic staff (at least p < 0.05 for all cases). In conclusion, this study indicates a high prevalence of MetS in university students and staff in Bangladesh. Age, BMI, hypertension and dyslipidemia were independently associated with the risk of MetS in both groups. The findings emphasize the importance of interventions for students and staff in academic settings in Bangladesh. It is crucial to implement health promotion activities such as healthy diet and exercise programs more rigorously. Further research with more representative samples is needed to get more clear insights into MetS prevalence in this particular population subgroup for targeted interventions.


Assuntos
Diabetes Mellitus Tipo 2 , Dislipidemias , Hipertensão , Síndrome Metabólica , Adulto , Humanos , Masculino , Feminino , Diabetes Mellitus Tipo 2/complicações , Prevalência , Estudos Transversais , Universidades , Bangladesh/epidemiologia , Fatores de Risco , Hipertensão/complicações , Dislipidemias/epidemiologia , Estudantes
8.
Transl Lung Cancer Res ; 12(4): 927-932, 2023 Apr 28.
Artigo em Inglês | MEDLINE | ID: mdl-37197637

RESUMO

Background: Recurrent in-frame insertions within exon 20 causing duplication of amino acids Tyrosine-Valine-Methionine-Alanine (YVMA) represent 80% of all HER2 alterations in non-small cell lung cancer (NSCLC). HER2 tyrosine kinase inhibitors (TKI), anti-HER2 monoclonal antibodies and HER2 directed antibody-drug conjugates have been evaluated in patients with HER2 mutated NSCLC. Limited data are available regarding the activity of these agents in exon 19 alterations. Osimertinib, a 3rd generation EGFR-TKI, has been found in pre-clinical studies to decrease growth of NSCLC with HER2 exon 19 aberrations. Case Description: A 68-year-old female with a past medical history of type 2 diabetes and minimal smoking was diagnosed with stage IV NSCLC. Next generation sequencing on tumor tissue demonstrated an ERBB2 exon 19 c.2262_2264delinsTCC, p.(L755P) mutation. After five lines of treatment that included chemotherapy, chemoimmunotherapy and investigational agents the patient's disease was progressing. At this time her functional status remained good, therefore clinical trials were explored however, none were available. Based on findings from pre-clinical studies, the patient was commenced on osimertinib 80 mg OD and achieved a partial response (PR) according to RESIST criteria both intra- and extracranially. Conclusions: This is the first report to our knowledge to demonstrate activity of osimertinib in a patient with NSCLC harboring HER2 exon 19, p.L755P mutation resulting in intra- and extracranial response. In the future, osimertinib could become a targeted treatment for patients harboring exon19 ERBB2 point mutations.

9.
J Clin Med ; 12(10)2023 May 17.
Artigo em Inglês | MEDLINE | ID: mdl-37240619

RESUMO

This study aims to determine the diagnostic accuracy of staging PET/CT and neck MRI in patients with laryngeal carcinoma and to assess the value of PET/CT in predicting progression-free survival (PFS) and overall survival (OS). Sixty-eight patients who had both modalities performed before treatment between 2014 and 2021 were included in this study. The sensitivity and specificity of PET/CT and MRI were evaluated. PET/CT had 93.8% sensitivity, 58.3% specificity, and 75% accuracy for nodal metastasis, whereas MRI had 68.8%, 61.1%, and 64.7% accuracy, respectively. At a median follow-up of 51 months, 23 patients had developed disease progression and 17 patients had died. Univariate-survival analysis revealed all utilized PET parameters as significant prognostic factors for OS and PFS (p-value < 0.03 each). In multivariate analysis, metabolic-tumor volume (MTV) and total lesion glycolysis (TLG) predicted better PFS (p-value < 0.05 each). In conclusion, PET/CT improves the accuracy of nodal staging in laryngeal carcinoma over neck MRI and adds to the prognostication of survival outcomes through the use of several PET metrics.

10.
Cancer Imaging ; 23(1): 99, 2023 Oct 19.
Artigo em Inglês | MEDLINE | ID: mdl-37858162

RESUMO

BACKGROUND: Accuracy of head and neck MRI (HN-MRI) in predicting tumor invasion of laryngeal site/subsites in patients with laryngeal cancer prior to laryngectomy is poorly evaluated in the literature. Therefore, we aim to evaluate the diagnostic value of HN-MRI in accurate pre-operative estimation of tumor invasion to laryngeal subsites in patients with laryngeal cancer. METHODS: Patients with laryngeal cancer who underwent HN-MRI for cancer staging and underwent total laryngectomy between 2008 and 2021 were included. Sensitivity, specificity, positive predictive value, negative predictive value, and overall accuracy of HN-MRI in predicting tumor invasion of laryngeal subsites were calculated based on concordance between the HN-MRI and histopathological results. RESULTS: One hundred and thirty-seven patients underwent total laryngectomy [primary: 82/137(60%), salvage 55/137(40%)]. The utilization of HN-MRI resulted in the downstaging of 16/137 (11.6%) patients and the upstaging of 8/137 (5.8%) patients. For the whole cohort, there was a significant discordance between HN-MRI and histopathology for T-category; out of 116 cT4a disease, 102(87.9%) were confirmed to have pT4a disease, and out of 17 cT3 disease, 9(52.9%) were confirmed to have pT3 disease, p < 0.001. The MRI overall diagnostic accuracy of predicting tumor invasion was 91%, 92%, 82%, 87%, 72%, 76%, 65% and 68% for base of tongue, arytenoid, vocal cord, posterior commissure, pre-epiglottic space, cricoid cartilage, inner thyroid cortex, and subglottis, respectively. CONCLUSIONS: In patients with laryngeal cancer undergoing total laryngectomy, HN-MRI demonstrates promising accuracy in predicting tumor invasion of specific laryngeal subsites (e.g., base of tongue). Our findings showed the potential of HN-MRI as a valuable tool for pre-operative planning and treatment decision-making in this patient population.


Assuntos
Neoplasias Laríngeas , Humanos , Neoplasias Laríngeas/diagnóstico por imagem , Neoplasias Laríngeas/cirurgia , Invasividade Neoplásica , Imageamento por Ressonância Magnética , Estadiamento de Neoplasias , Laringectomia/métodos , Estudos Retrospectivos
11.
Chem Rev ; 115(11): 5462-569, 2015 Jun 10.
Artigo em Inglês | MEDLINE | ID: mdl-25993416
12.
Acta Crystallogr Sect E Struct Rep Online ; 68(Pt 12): o3362, 2012 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-23476196

RESUMO

In the title compound, C18H18N4O4S2, the mean planes passing through the tosyl benzene rings form dihedral angles of 48.42 (9) and 15.1 (1)° with the amino-pyrimidine ring. In the crystal, mol-ecules associate via N-H⋯N and N-H⋯O hydrogen bonds, forming extended hydrogen-bonded sheets that lie parallel to the bc plane. The N-H⋯N hydrogen bonds propagate along the b-axis direction, while the N-H⋯O hydrogen bonds propagate along the c-axis direction.

13.
Acta Crystallogr Sect E Struct Rep Online ; 68(Pt 4): o1136, 2012 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-22606085

RESUMO

The title compound, C(19)H(19)N(3)O(4)S(2), was prepared by the reaction of 2,3-diamino-pyridine with tosyl chloride in a mixture of dichloro-methane-pyridine as solvent. In the crystal, mol-ecules associate via pairs of N-H⋯N hydrogen bonds, forming a centrosymmetric eight-membered {⋯HNCN}(2) synthon. The dihedral angles between the amino-pyridine ring and the tosyl benzene rings are 50.01 (6) and 32.01 (4)°.

14.
ChemMedChem ; 17(10): e202100776, 2022 05 18.
Artigo em Inglês | MEDLINE | ID: mdl-35170857

RESUMO

Akt is a protein kinase that has been implicated in the progression of cancerous tumours. A number of covalent allosteric Akt inhibitors are known, and based on these scaffolds, a small library of novel potential covalent allosteric imidazopyridine-based inhibitors was designed. The envisaged compounds were synthesised, with click chemistry enabling a modular approach to a number of the target compounds. The binding modes, potencies and antiproliferative activities of these synthesised compounds were explored, thereby furthering the structure activity relationship knowledge of this class of Akt inhibitors. Three novel covalent inhibitors were identified, exhibiting moderate activity against Akt1 and various cancer cell lines, potentially paving the way for future covalent allosteric inhibitors with improved properties.


Assuntos
Inibidores de Proteínas Quinases , Proteínas Proto-Oncogênicas c-akt , Regulação Alostérica , Inibidores de Proteínas Quinases/química , Inibidores de Proteínas Quinases/farmacologia , Proteínas Proto-Oncogênicas c-akt/metabolismo , Relação Estrutura-Atividade
15.
Clin Lung Cancer ; 23(7): 578-584, 2022 11.
Artigo em Inglês | MEDLINE | ID: mdl-36041949

RESUMO

INTRODUCTION: LUN17-139 evaluated the safety and efficacy of Atezolizumab (A) plus Carboplatin (C) plus Pemetrexed (Pem) plus Bevacizumab (B) (ACBPem) in treatment naïve patients with stage IV non-squamous non-small cell lung cancer (Ns-NSCLC). PATIENTS AND METHODS: In this multicenter, single-arm phase II trial, all patients received A (1200-mg, D1) + C (AUC 5, D1) + Pem (500-mg/m2, D1) + B (15-mg/kg D1) q3 week x4. If no PD (progressive disease), patients received maintenance ABPem until PD or intolerable side effects. The primary endpoint was progression-free survival (PFS). The positive PFS result was considered as PFS>6m (historical control). Secondary endpoints included objective response rate (ORR), disease control rate (DCR) defined by complete response (CR) + partial response (PR) + stable disease (SD) ≥ 2 months, overall survival (OS), and safety. RESULTS: Thirty patients were enrolled from November 2018 to October 2020. The study was closed early due to 3 patient deaths, possibly related to treatment. Median age 64 (range 38-83); Men/Women 20/10; PD-L1 TPS < 1%/1-49%/ ≥ 50% (8/15/7). The median follow-up was 20.3 months ( 1-28.1). ORR 42.9% (95% CI, 24.5-62.8%), DCR 96.4% (95% CI, 81.7-99.9%). The median PFS and OS were 11.3m (5.5-14.9,P > .05) and 22.4m (22.4-NR), respectively. Four patients had G4 toxicity (anemia, febrile-neutropenia, severe neutropenia, sepsis), and 3 patients had G5 toxicity (thromboembolism, sepsis, colonic perforation). CONCLUSION: ABCPem was associated with increased PFS compared to historical controls but this difference did not meet the statistical significance. Three on-treatment deaths and 5 thromboembolic events prompted early closure.


Assuntos
Carcinoma Pulmonar de Células não Pequenas , Neoplasias Pulmonares , Neutropenia , Sepse , Masculino , Humanos , Feminino , Pessoa de Meia-Idade , Pemetrexede/uso terapêutico , Carboplatina/uso terapêutico , Bevacizumab/uso terapêutico , Antígeno B7-H1 , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Neutropenia/etiologia
16.
ACS Appl Mater Interfaces ; 12(34): 38614-38625, 2020 Aug 26.
Artigo em Inglês | MEDLINE | ID: mdl-32803962

RESUMO

Piezo- and pyroelectricity is an intrinsically combined material property for all ferroelectric materials. While the pyroelectric coefficients of most ferroelectric ceramics and polymers have the same sign, their piezoelectric coefficients have opposite ones. On this basis, we can create a polymer-ceramic nanocomposite material where either the piezo- or the pyroelectric effect is suppressed by a selective poling of the single constituents, a concept that was shown for composite pellets in the late 1990s. Motivated by the current demand for lightweight and low-cost piezoelectric sensors with reduced cross-sensitivity to temperature variations, we have taken up this idea and formulated screen-printable nanocomposite pastes from poly(vinylidene fluoride-trifluoroethylene (P(VDF-TrFE)) and lead titanate (PbTiO3, PT) or sodium bismuth titanate (NaBiTi2O6 or BNT) nanoparticles, respectively. We demonstrate that printed sensors on flexible substrates based on these materials can be conditioned by selective poling of the nanoparticles and the polymer matrix to show either only piezoelectric or only pyroelectric sensor response. We examined the degree of cross-talk between the thermal and pressure sensing channels and show a reduction of over 90% cross-sensitivity for the ferroelectric composites compared to pure P(VDF-TrFE) sensors.

17.
Anticancer Res ; 38(9): 5247-5251, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-30194174

RESUMO

BACKGROUND: The tolerability of adjuvant chemotherapy in esophageal cancer is unclear. PATIENTS AND METHODS: This was a phase II trial of adjuvant paclitaxel in patients with esophageal cancer after trimodality treatment. Patients with residual viable tumor after resection were eligible for study inclusion. Treatment was 80 mg/m2 paclitaxel intravenously on days 1, 8, and 15 every 28 days for total of two cycles. The primary objective was to determine whether 75% or more of the patients would tolerate 240 mg/m2 or more of paclitaxel, which corresponded to 50% or more of the total planned dose. RESULTS: Eleven out of the 12 enrolled patients (92%, 95% confidence interval (CI)=62-100%) were able to complete at least 50% of the planned paclitaxel dose. Median progression-free survival was 7 months (95% CI=2-28 months). Median overall survival was 28 months (95% CI=12-36 months). Only one patient experienced a grade 4 adverse event. CONCLUSION: Screening patients with esophageal cancer after trimodality treatment might improve completion of adjuvant trials.


Assuntos
Antineoplásicos Fitogênicos/administração & dosagem , Neoplasias Esofágicas/tratamento farmacológico , Neoplasias Esofágicas/cirurgia , Paclitaxel/administração & dosagem , Adulto , Idoso , Antineoplásicos Fitogênicos/efeitos adversos , Quimioterapia Adjuvante , Intervalo Livre de Doença , Esquema de Medicação , Esofagectomia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Paclitaxel/efeitos adversos , Resultado do Tratamento
18.
Org Lett ; 19(13): 3342-3345, 2017 07 07.
Artigo em Inglês | MEDLINE | ID: mdl-28631468

RESUMO

We prepared pyrene-substituted imidazolium-based ionic liquids (PILs) as organic catalysts for the SN2 fluorination using alkali metal fluoride (MF). In this system, the PIL significantly enhanced the reactivity of MF due to the phase-transfer catalytic effect of the imidazolium moiety as well as the metal cation-π (pyrene) interactions. Furthermore, this homogeneous catalyst PIL was easily separated from the reaction mixture using reduced graphene oxide by π-π stacking with the pyrene of PIL.

19.
Cancer Res ; 77(18): 5054-5067, 2017 09 15.
Artigo em Inglês | MEDLINE | ID: mdl-28765155

RESUMO

Elderly cancer patients treated with ionizing radiation (IR) or chemotherapy experience more frequent and greater normal tissue toxicity relative to younger patients. The current study demonstrates that exponentially growing fibroblasts from elderly (old) male donor subjects (70, 72, and 78 years) are significantly more sensitive to clonogenic killing mediated by platinum-based chemotherapy and IR (∼70%-80% killing) relative to young fibroblasts (5 months and 1 year; ∼10%-20% killing) and adult fibroblasts (20 years old; ∼10%-30% killing). Old fibroblasts also displayed significantly increased (2-4-fold) steady-state levels of O2•-, O2 consumption, and mitochondrial membrane potential as well as significantly decreased (40%-50%) electron transport chain (ETC) complex I, II, IV, V, and aconitase (70%) activities, decreased ATP levels, and significantly altered mitochondrial structure. Following adenoviral-mediated overexpression of SOD2 activity (5-7-fold), mitochondrial ETC activity and aconitase activity were restored, demonstrating a role for mitochondrial O2•- in these effects. Old fibroblasts also demonstrated elevated levels of endogenous DNA damage that were increased following treatment with IR and chemotherapy. Most importantly, treatment with the small-molecule, superoxide dismutase mimetic (GC4419; 0.25 µmol/L) significantly mitigated the increased sensitivity of old fibroblasts to IR and chemotherapy and partially restored mitochondrial function without affecting IR or chemotherapy-induced cancer cell killing. These results support the hypothesis that age-associated increased O2•- and resulting DNA damage mediate the increased susceptibility of old fibroblasts to IR and chemotherapy that can be mitigated by GC4419. Cancer Res; 77(18); 5054-67. ©2017 AACR.


Assuntos
Cisplatino/efeitos adversos , Fibroblastos/patologia , Mitocôndrias/patologia , Radiação Ionizante , Pele/patologia , Superóxidos/metabolismo , Adulto , Fatores Etários , Idoso , Animais , Antineoplásicos/efeitos adversos , Apoptose/efeitos dos fármacos , Apoptose/efeitos da radiação , Proliferação de Células/efeitos dos fármacos , Proliferação de Células/efeitos da radiação , Células Cultivadas , Fibroblastos/efeitos dos fármacos , Fibroblastos/efeitos da radiação , Humanos , Masculino , Potencial da Membrana Mitocondrial/efeitos dos fármacos , Potencial da Membrana Mitocondrial/efeitos da radiação , Camundongos , Camundongos Endogâmicos C57BL , Mitocôndrias/efeitos dos fármacos , Mitocôndrias/efeitos da radiação , Estresse Oxidativo , Pele/efeitos dos fármacos , Pele/efeitos da radiação , Superóxido Dismutase/metabolismo , Adulto Jovem
20.
Adv Radiat Oncol ; 2(4): 581-587, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-29204525

RESUMO

PURPOSE: The adrenal glands are a common site of metastases because of their rich blood supply. Previously, adrenal metastases were treated with systemic chemotherapy or, more rarely, with surgical resection or palliative radiation therapy. Stereotactic body radiation therapy (SBRT) has recently emerged as an attractive noninvasive approach to definitively treat these lesions. We present our experience in treating adrenal metastases using SBRT and review the current literature. METHODS AND MATERIALS: This is a single-institution retrospective review of patients who received SBRT to adrenal metastases originating from various primary malignancies. Patients who were eligible for SBRT included those with limited metastatic disease (≤5 sites) with otherwise controlled metastatic disease and uncontrolled adrenal metastases. RESULTS: Ten patients met the study's inclusion criteria and received SBRT doses of 30 to 48 Gy in 3 to 5 fractions. Acute sequelae of SBRT treatment included 4 patients with grades 1 or 2 nausea, 3 patients with grade 1 fatigue, and 1 with grade 1 diarrhea. The median follow-up was 6 months with a median overall survival of 9.9 months. One patient demonstrated progressive adrenal gland disease 18.8 months after SBRT treatment. Seven patients developed new distant metastases after treatment, with a median progression-free survival of 3.4 months. Three months after SBRT to the adrenal gland, 1 patient developed a gastrointestinal bleed. CONCLUSIONS: These results complement the limited existing body of literature by demonstrating that SBRT provides good control of treated adrenal gland metastasis; however, high-grade late toxicities may occur. More stringent dose constraint limits may prevent associated serious adverse events.

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