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1.
Artigo em Inglês | MEDLINE | ID: mdl-38291985

RESUMO

Poor oral health is associated with cardiovascular disease and dementia. Potential pathways include sepsis from oral bacteria, systemic inflammation, and nutritional deficiencies. However, in post-industrialized populations, links between oral health and chronic disease may be confounded because the lower socioeconomic exposome (poor diet, pollution, and low physical activity) often entails insufficient dental care. We assessed tooth loss, caries, and damaged teeth, in relation to cardiovascular and brain aging among the Tsimane, a subsistence population living a relatively traditional forager-horticulturalist lifestyle with poor dental health, but minimal cardiovascular disease and dementia. Dental health was assessed by a physician in 739 participants aged 40-92 years with cardiac and brain health measured by chest computed tomography (CT; n = 728) and brain CT (n = 605). A subset of 356 individuals aged 60+ were also assessed for dementia and mild cognitive impairment (n = 33 impaired). Tooth loss was highly prevalent, with 2.2 teeth lost per decade and a 2-fold greater loss in women. The number of teeth with exposed pulp was associated with higher inflammation, as measured by cytokine levels and white blood cell counts, and lower body mass index. Coronary artery calcium and thoracic aortic calcium were not associated with tooth loss or damaged teeth. However, aortic valve calcification and brain tissue loss were higher in those who had more teeth with exposed pulp. Overall, these results suggest that dental health is associated with indicators of chronic diseases in the absence of typical confounds, even in a population with low cardiovascular and dementia risk factors.


Assuntos
Valva Aórtica , Valva Aórtica/patologia , Encéfalo , Calcinose , Inflamação , Saúde Bucal , Humanos , Feminino , Masculino , Idoso , Pessoa de Meia-Idade , Calcinose/diagnóstico por imagem , Valva Aórtica/diagnóstico por imagem , Idoso de 80 Anos ou mais , Encéfalo/diagnóstico por imagem , Encéfalo/patologia , Adulto , Perda de Dente/epidemiologia , Demência/epidemiologia , Demência/etiologia , Demência/diagnóstico por imagem , Estenose da Valva Aórtica/diagnóstico por imagem , Estenose da Valva Aórtica/epidemiologia , Disfunção Cognitiva , Tomografia Computadorizada por Raios X , Tamanho do Órgão
2.
Cancers (Basel) ; 13(3)2021 Jan 29.
Artigo em Inglês | MEDLINE | ID: mdl-33572851

RESUMO

Multiple myeloma (MM) is a genetically heterogeneous disease characterized by genomic chaos making it difficult to distinguish driver from passenger mutations. In this study, we integrated data from whole genome gene expression profiling (GEP) microarrays and CytoScan HD high-resolution genomic arrays to integrate GEP with copy number variations (CNV) to more precisely define molecular alterations in MM important for disease initiation, progression and poor clinical outcome. We utilized gene expression arrays from 351 MM samples and CytoScan HD arrays from 97 MM samples to identify eight CNV events that represent possible MM drivers. By integrating GEP and CNV data we divided the MM into eight unique subgroups and demonstrated that patients within one of the eight distinct subgroups exhibited common and unique protein network signatures that can be utilized to identify new therapeutic interventions based on pathway dysregulation. Data also point to the central role of 1q gains and the upregulated expression of ANP32E, DTL, IFI16, UBE2Q1, and UBE2T as potential drivers of MM aggressiveness. The data presented here utilized a novel approach to identify potential driver CNV events in MM, the creation of an improved definition of the molecular basis of MM and the identification of potential new points of therapeutic intervention.

4.
PLoS One ; 15(11): e0240900, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33147238

RESUMO

This study focuses on the multidisciplinary investigation of three stucco-shrouded mummies with mummy portrait from Egypt dating from the late 3rd to the middle of the 4th century AD, corresponding to the late Roman Period. These three mummies were excavated in the early 17th and late 19th centuries in the Saqqara necropolis near the ancient Egyptian capital of Memphis. Two of them experienced an interesting collection history, when they became part of the collection of the Elector of Saxony and King of Poland August II in Dresden, Germany, in 1728. The investigation includes information about the mummies' discovery, collection history and shroud decoration obtained through Egyptological expertise. In addition, information on the state of preservation, technique of artificial mummification, age at death, sex, body height and health of the deceased was achieved through computed tomography (CT) analysis. Research yielded an adult male, a middle-aged female and a young female. Due to the rather poorly preserved bodies of the male and middle-aged female, a specific technique of artificial mummification could not be ascertained. Brain and several internal organs of the well-preserved young female were identified. Wooden boards, beads of necklaces, a hairpin, and metal dense items, such as lead seals, nails and two coins or medallions were discovered. Paleopathological findings included carious lesions, Schmorl's nodes, evidence of arthritis and a vertebral hemangioma. The study revealed insights on the decoration and burial preparation of individuals of upper socioeconomic status living in the late Roman Period, as well as comprehensive bioanthropological information of the deceased.


Assuntos
Sepultamento/métodos , Embalsamamento/métodos , Múmias/diagnóstico por imagem , Retratos como Assunto , Religião , Adulto , Sepultamento/história , Egito , Embalsamamento/história , Feminino , História Antiga , Humanos , Masculino , Pessoa de Meia-Idade , Tomografia Computadorizada por Raios X , Adulto Jovem
5.
J Natl Cancer Inst ; 112(5): 507-515, 2020 05 01.
Artigo em Inglês | MEDLINE | ID: mdl-31406992

RESUMO

BACKGROUND: Treatment failures in cancers, including multiple myeloma (MM), are most likely due to the persistence of a minor population of tumor-initiating cells (TICs), which are noncycling or slowly cycling and very drug resistant. METHODS: Gene expression profiling and real-time quantitative reverse transcription polymerase chain reaction were employed to define genes differentially expressed between the side-population cells, which contain the TICs, and the main population of MM cells derived from 11 MM patient samples. Self-renewal potential was analyzed by clonogenicity and drug resistance of CD24+ MM cells. Flow cytometry (n = 60) and immunofluorescence (n = 66) were applied on MM patient samples to determine CD24 expression. Therapeutic effects of CD24 antibodies were tested in xenograft MM mouse models containing three to six mice per group. RESULTS: CD24 was highly expressed in the side-population cells, and CD24+ MM cells exhibited high expression of induced pluripotent or embryonic stem cell genes. CD24+ MM cells showed increased clonogenicity, drug resistance, and tumorigenicity. Only 10 CD24+ MM cells were required to develop plasmacytomas in mice (n = three of five mice after 27 days). The frequency of CD24+ MM cells was highly variable in primary MM samples, but the average of CD24+ MM cells was 8.3% after chemotherapy and in complete-remission MM samples with persistent minimal residual disease compared with 1.0% CD24+ MM cells in newly diagnosed MM samples (n = 26). MM patients with a high initial percentage of CD24+ MM cells had inferior progression-free survival (hazard ratio [HR] = 3.81, 95% confidence interval [CI] = 5.66 to 18.34, P < .001) and overall survival (HR = 3.87, 95% CI = 16.61 to 34.39, P = .002). A CD24 antibody inhibited MM cell growth and prevented tumor progression in vivo. CONCLUSION: Our studies demonstrate that CD24+ MM cells maintain the TIC features of self-renewal and drug resistance and provide a target for myeloma therapy.


Assuntos
Mieloma Múltiplo/patologia , Células-Tronco Neoplásicas/patologia , Animais , Antígeno CD24/biossíntese , Antígeno CD24/imunologia , Carcinogênese , Autorrenovação Celular/fisiologia , Resistencia a Medicamentos Antineoplásicos , Feminino , Xenoenxertos , Humanos , Masculino , Camundongos , Camundongos Endogâmicos NOD , Mieloma Múltiplo/tratamento farmacológico , Mieloma Múltiplo/genética , Mieloma Múltiplo/imunologia , Células-Tronco Neoplásicas/imunologia
8.
Lancet ; 389(10080): 1730-1739, 2017 04 29.
Artigo em Inglês | MEDLINE | ID: mdl-28320601

RESUMO

BACKGROUND: Conventional coronary artery disease risk factors might potentially explain at least 90% of the attributable risk of coronary artery disease. To better understand the association between the pre-industrial lifestyle and low prevalence of coronary artery disease risk factors, we examined the Tsimane, a Bolivian population living a subsistence lifestyle of hunting, gathering, fishing, and farming with few cardiovascular risk factors, but high infectious inflammatory burden. METHODS: We did a cross-sectional cohort study including all individuals who self-identified as Tsimane and who were aged 40 years or older. Coronary atherosclerosis was assessed by coronary artery calcium (CAC) scoring done with non-contrast CT in Tsimane adults. We assessed the difference between the Tsimane and 6814 participants from the Multi-Ethnic Study of Atherosclerosis (MESA). CAC scores higher than 100 were considered representative of significant atherosclerotic disease. Tsimane blood lipid and inflammatory biomarkers were obtained at the time of scanning, and in some patients, longitudinally. FINDINGS: Between July 2, 2014, and Sept 10, 2015, 705 individuals, who had data available for analysis, were included in this study. 596 (85%) of 705 Tsimane had no CAC, 89 (13%) had CAC scores of 1-100, and 20 (3%) had CAC scores higher than 100. For individuals older than age 75 years, 31 (65%) Tsimane presented with a CAC score of 0, and only four (8%) had CAC scores of 100 or more, a five-fold lower prevalence than industrialised populations (p≤0·0001 for all age categories of MESA). Mean LDL and HDL cholesterol concentrations were 2·35 mmol/L (91 mg/dL) and 1·0 mmol/L (39·5 mg/dL), respectively; obesity, hypertension, high blood sugar, and regular cigarette smoking were rare. High-sensitivity C-reactive protein was elevated beyond the clinical cutoff of 3·0 mg/dL in 360 (51%) Tsimane participants. INTERPRETATION: Despite a high infectious inflammatory burden, the Tsimane, a forager-horticulturalist population of the Bolivian Amazon with few coronary artery disease risk factors, have the lowest reported levels of coronary artery disease of any population recorded to date. These findings suggest that coronary atherosclerosis can be avoided in most people by achieving a lifetime with very low LDL, low blood pressure, low glucose, normal body-mass index, no smoking, and plenty of physical activity. The relative contributions of each are still to be determined. FUNDING: National Institute on Aging, National Institutes of Health; St Luke's Hospital of Kansas City; and Paleocardiology Foundation.


Assuntos
Aterosclerose/etnologia , Doença da Artéria Coronariana/etnologia , Adulto , Distribuição por Idade , Idoso , Idoso de 80 Anos ou mais , Antropometria/métodos , Aterosclerose/sangue , Aterosclerose/diagnóstico por imagem , Aterosclerose/etiologia , Bolívia/epidemiologia , Estudos de Coortes , Angiografia Coronária/métodos , Doença da Artéria Coronariana/sangue , Doença da Artéria Coronariana/diagnóstico por imagem , Doença da Artéria Coronariana/etiologia , Estudos Transversais , Feminino , Humanos , Mediadores da Inflamação/sangue , Estilo de Vida , Lipídeos/sangue , Masculino , Pessoa de Meia-Idade , Fatores de Risco , Índice de Gravidade de Doença , Tomografia Computadorizada por Raios X
9.
Innovations (Phila) ; 12(2): 87-94, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28346263

RESUMO

OBJECTIVE: This study reports the evolution of a minimally invasive aortic valve replacement (mini-AVR) technique that uses a right anterior minithoracotomy approach with central cannulation, for a 13-year period. This technique has become our standard approach for isolated primary AVR in nearly all patients. METHODS: This observational study evaluated perioperative clinical outcomes of patients 18 years or older who underwent mini-AVR from November 2003 to June 2015. RESULTS: The mini-AVR technique was used in 202 patients during two periods of 2003 to 2009 (n = 65, "early") and 2010 to 2015 (n = 137, "late"). The mean ± SD age was 72.5 ± 12.9 years and 60% were male. Demographic parameters were statistically similar between the study periods, except for increased body weight in the later period (75.3 ± 14.7 vs 80.9 ± 20.8 kg, P = 0.03). The mean cardiopulmonary bypass and aortic cross-clamp times were significantly different by each year and Bonferroni adjustment, with significant decreases in cardiopulmonary bypass and aortic cross-clamp times beginning 2006. Compared with the early study period, late study period patients were more often extubated intraoperatively (52% vs 12%, P < 0.001), had less frequent prolonged ventilator use postoperatively (6% vs 16%, P = 0.018), required fewer blood transfusions (mean, 2.0 ± 2.3 U vs 3.6 ± 3.0 U; P = 0.011), and had shorter postoperative stay (6.3 ± 4.5 days vs 8.0 ± 5.9 days, P = 0.026). Numerically, fewer postoperative strokes (1% vs 6%, P = 0.09) and fewer reoperations for bleeding (3% vs 6%, P = 0.3) occurred in the late period. In-hospital mortality did not differ (1/65 early vs 3/137 late). CONCLUSIONS: Overall mini-AVR intraoperative and postoperative clinical outcomes improved for this 13-year experience.


Assuntos
Implante de Prótese de Valva Cardíaca/instrumentação , Toracotomia/métodos , Idoso , Idoso de 80 Anos ou mais , Feminino , Implante de Prótese de Valva Cardíaca/métodos , Humanos , Masculino , Pessoa de Meia-Idade , Procedimentos Cirúrgicos Minimamente Invasivos/instrumentação , Procedimentos Cirúrgicos Minimamente Invasivos/métodos , Resultado do Tratamento
10.
Methods Mol Biol ; 1364: 209-17, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-26472453

RESUMO

RNA aptamers are single-stranded RNA oligos that represent a powerful emerging technology with potential for treating numerous diseases. More recently, cell-targeted RNA aptamers have been developed for delivering RNA interference (RNAi) modulators (siRNAs and miRNAs) to specific diseased cells (e.g., cancer cells or HIV infected cells) in vitro and in vivo. However, despite initial promising reports, the broad application of this aptamer delivery technology awaits the development of methods that can verify and confirm delivery of aptamers to the cytoplasm of target cells where the RNAi machinery resides. We recently developed a functional assay (RIP assay) to confirm cellular uptake and subsequent cytoplasmic release of an RNA aptamer which binds to a cell surface receptor expressed on prostate cancer cells (PSMA). To assess cytoplasmic delivery, the aptamer was chemically conjugated to saporin, a ribosome inactivating protein toxin that is toxic to cells only when delivered to the cytoplasm (where it inhibits the ribosome) by a cell-targeting ligand (e.g., aptamer). Here, we describe the chemistry used to conjugate the aptamer to saporin and discuss a gel-based method to verify conjugation efficiency. We also detail an in vitro functional assay to confirm that the aptamer retains function following conjugation to saporin and describe a cellular assay to measure aptamer-mediated saporin-induced cytotoxicity.


Assuntos
Aptâmeros de Nucleotídeos/metabolismo , Citoplasma/metabolismo , Portadores de Fármacos/metabolismo , Proteínas Inativadoras de Ribossomos Tipo 1/metabolismo , Antígenos de Superfície/metabolismo , Aptâmeros de Nucleotídeos/genética , Linhagem Celular , Portadores de Fármacos/toxicidade , Glutamato Carboxipeptidase II/metabolismo , Humanos , Interferência de RNA , Proteínas Inativadoras de Ribossomos Tipo 1/toxicidade , Saporinas
11.
Clin Cancer Res ; 21(24): 5532-42, 2015 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-26156395

RESUMO

PURPOSE: CKS1B is significantly upregulated in multiple myeloma and associated with poor prognosis. The identification of novel therapies is essential for effective treatment of patients resistant to chemotherapy. The NEDD8 inhibitor MLN4924 selectively targets SCF(Skp2) activation and offers a more specific approach to protein degradation inhibition than total proteasomal inhibition. The goal of this study was to evaluate whether MLN4924 is effective in high CKS1B conditions and identify mechanisms regulating drug potency. EXPERIMENTAL DESIGN: Bortezomib and MLN4924 sensitivity was assessed through proliferation, viability, clonogenic potential, and senescence induction in cells overexpressing CKS1B. The mechanism for MLN4924 sensitivity was elucidated by immunoblot analysis of SCF(skp) substrates and confirmed by shRNA knockdown. The clinical relevance of the NEDD8 pathway was examined in gene expression profiles (GEP) derived from healthy people, patients with monoclonal gammopathy of undetermined significance (MGUS), and multiple myeloma. RESULTS: Cells overexpressing CKS1B were resistant to bortezomib but sensitive to MLN4924. Treatment of CKS1B-overexpressing cells with MLN4924 decreased proliferation, clonogenicity, and induced senescence. MLN4924, but not bortezomib, induced stabilization of p21 and knockdown of p21 resulted in loss of MLN4924 sensitivity. Patients with MGUS and multiple myeloma exhibited increased expression of NEDD8 pathway genes relative to normal plasma cells. Multiple myeloma patients with high NEDD8 expression were linked to bortezomib resistance in clinical trials, and had inferior outcomes. CONCLUSIONS: Our data demonstrate that cells with elevated CKS1B expression are resistant to bortezomib but sensitive to MLN4924 and offer a mechanism through the stabilization of p21. These findings provide rationale for targeting the NEDD8 pathway in multiple myeloma patients exhibiting elevated expression of CKS1B. Clin Cancer Res; 21(24); 5532-42. ©2015 AACR.


Assuntos
Quinases relacionadas a CDC2 e CDC28/genética , Inibidor de Quinase Dependente de Ciclina p21/metabolismo , Ciclopentanos/farmacologia , Resistencia a Medicamentos Antineoplásicos/genética , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Mieloma Múltiplo/genética , Pirimidinas/farmacologia , Ubiquitinas/antagonistas & inibidores , Antineoplásicos/farmacologia , Antineoplásicos/uso terapêutico , Apoptose/efeitos dos fármacos , Bortezomib/farmacologia , Quinases relacionadas a CDC2 e CDC28/metabolismo , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Inibidor de Quinase Dependente de Ciclina p21/genética , Ciclopentanos/uso terapêutico , Perfilação da Expressão Gênica , Humanos , Estimativa de Kaplan-Meier , Mieloma Múltiplo/tratamento farmacológico , Mieloma Múltiplo/metabolismo , Mieloma Múltiplo/mortalidade , Proteína NEDD8 , Proteólise , Pirimidinas/uso terapêutico , Transdução de Sinais/efeitos dos fármacos , Ubiquitinas/metabolismo
13.
J Nucl Cardiol ; 22(2): 248-61, 2015 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-25287737

RESUMO

BACKGROUND: Total and reversible left ventricular (LV) perfusion defect size (PDS) predict patient outcome. Limited data exist as to whether regadenoson induces similar perfusion abnormalities as observed with adenosine. We sought to determine whether regadenoson induces a similar LV PDS as seen with adenosine across varying patient populations. METHODS AND RESULTS: ADVANCE MPI were prospective, double-blind randomized trials comparing regadenoson to standard adenosine myocardial perfusion tomography (SPECT). Following an initial adenosine SPECT, patients were randomized to either regadenoson (N = 1284) or a second adenosine study (N = 660). SPECT quantification was performed blinded to randomization and image sequence. Propensity analysis was used to define comparability of regadenoson and adenosine perfusion results. Baseline clinical and SPECT results were similar in the two randomized groups. There was a close correlation between adenosine and regadenoson-induced total (r (2) = 0.98, P < .001) and reversible (r (2) = 0.92, P < .001) PDS. Serial differences in total (0.00 ± 3.51 vs -0.11 ± 3.46, P = .51) and reversible (0.15 ± 3.79 vs 0.07 ± 3.33, P = .65) PDS were also comparable in patients randomized to regadenoson vs adenosine, respectively, and irrespective of age, gender, diabetic status, body mass index, or prior cardiovascular history. By propensity analysis, regadenoson-induced total PDS was significantly larger than observed with adenosine. CONCLUSION: This is the first study to show that regadenoson induces similar, if not larger, perfusion defects than those observed with adenosine across different patient populations and demonstrates the value of quantitative analysis for defining serial changes in SPECT perfusion results. Regadenoson should provide comparable diagnostic and prognostic SPECT information to that obtained with adenosine.


Assuntos
Adenosina , Doença da Artéria Coronariana/diagnóstico por imagem , Imagem de Perfusão do Miocárdio/métodos , Purinas , Pirazóis , Tomografia Computadorizada de Emissão de Fóton Único/métodos , Disfunção Ventricular Esquerda/diagnóstico por imagem , Agonistas do Receptor A2 de Adenosina , Idoso , Doença da Artéria Coronariana/complicações , Método Duplo-Cego , Feminino , Humanos , Aumento da Imagem/métodos , Interpretação de Imagem Assistida por Computador/métodos , Masculino , Reprodutibilidade dos Testes , Sensibilidade e Especificidade , Volume Sistólico , Vasodilatadores , Disfunção Ventricular Esquerda/etiologia
14.
Mol Ther ; 22(11): 1910-22, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-24954476

RESUMO

Cell-targeted therapies (smart drugs), which selectively control cancer cell progression with limited toxicity to normal cells, have been developed to effectively treat some cancers. However, many cancers such as metastatic prostate cancer (PC) have yet to be treated with current smart drug technology. Here, we describe the thorough preclinical characterization of an RNA aptamer (A9g) that functions as a smart drug for PC by inhibiting the enzymatic activity of prostate-specific membrane antigen (PSMA). Treatment of PC cells with A9g results in reduced cell migration/invasion in culture and metastatic disease in vivo. Importantly, A9g is safe in vivo and is not immunogenic in human cells. Pharmacokinetic and biodistribution studies in mice confirm target specificity and absence of non-specific on/off-target effects. In conclusion, these studies provide new and important insights into the role of PSMA in driving carcinogenesis and demonstrate critical endpoints for the translation of a novel RNA smart drug for advanced stage PC.


Assuntos
Antígenos de Superfície/metabolismo , Aptâmeros de Nucleotídeos/administração & dosagem , Glutamato Carboxipeptidase II/metabolismo , Terapia de Alvo Molecular/métodos , Neoplasias da Próstata/metabolismo , Neoplasias da Próstata/terapia , Animais , Aptâmeros de Nucleotídeos/farmacocinética , Linhagem Celular Tumoral , Movimento Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Humanos , Masculino , Camundongos , Metástase Neoplásica , Ensaios Antitumorais Modelo de Xenoenxerto
15.
Atherosclerosis ; 233(1): 284-90, 2014 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-24529158

RESUMO

OBJECTIVE: We previously validated a gene expression score (GES) based on age, sex and peripheral blood cell expression levels of 23 genes measured by quantitative real-time PCR (qRT-PCR) for diagnosis of obstructive coronary artery disease (CAD) (≥ 50% luminal diameter stenosis). In this study we sought to determine the association between the GES and coronary arterial Plaque Burden and Stenosis by CT-angiography. METHODS: A total of 610 patients (mean age: 57 ± 11; 50% male) from the PREDICT and COMPASS studies from 59 centers were analyzed. Coronary artery calcium (CAC) scoring, CT angiography (CTA)-based plaque and stenosis and GES measurements were performed. CAC was expressed as Agatston score and CTA evaluated for stenosis severity: 0. None; 1. Minimal, 2. Mild, 3. Moderate, 4. Severe and 5. Occluded. Correlation analysis, one-way analysis of variance (ANOVA) and receiver operating characteristics (ROC) analyses were performed. RESULTS: GES was significantly associated with plaque burden by CAC (r = 0.50; p < 0.001) and CTA (segment involvement score index: r = 0.37, p < 0.001); a low score (≤ 15) had sensitivity of 0.71 and a high score (≥ 28) a specificity of 0.97 for the prediction of zero vs. non-zero CAC. Increasing GES was associated with a greater degree of categorical stenosis by ANOVA (p < 0.001); GES significantly correlated with maximum luminal stenosis (r = 0.41; p < 0.01) and segment stenosis score index (r = 0.38; p < 0.01). A low score had sensitivity of 0.90 and a high score a specificity of 0.87 for ≥ 70% stenosis. CONCLUSIONS: A previously validated GES is significantly associated with Plaque Burden and Stenosis by CT. CLINICAL TRIAL REGISTRATION: (PREDICT [NCT00500617] and COMPASS [NCT01117506]), www.clinicaltrials.gov.


Assuntos
Doença da Artéria Coronariana/sangue , Placa Aterosclerótica/patologia , Transcriptoma , Idoso , Calcinose/diagnóstico por imagem , Constrição Patológica/patologia , Angiografia Coronária/métodos , Doença da Artéria Coronariana/diagnóstico por imagem , Vasos Coronários/metabolismo , Efeitos Psicossociais da Doença , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Placa Aterosclerótica/fisiopatologia , Tomografia Computadorizada por Raios X/métodos
16.
Thromb Haemost ; 111(5): 883-91, 2014 May 05.
Artigo em Inglês | MEDLINE | ID: mdl-24402559

RESUMO

Vorapaxar is an antagonist of the protease activated receptor-1 (PAR-1), the principal platelet thrombin receptor. The Thrombin Receptor Antagonist for Clinical Event Reduction (TRACER) trial evaluated vorapaxar compared to placebo in non-ST-elevation (NSTE)-acute coronary syndrome (ACS) patients. It was the study's objective to assess the pharmacodynamic effects of vorapaxar versus placebo that included aspirin or a thienopyridine or, frequently, a combination of both agents in NSTE-ACS patients. In a substudy involving 249 patients, platelet aggregation was assessed by light transmittance aggregometry (LTA) in 85 subjects (41 placebo, 44 vorapaxar) using the agonists thrombin receptor activating peptide (TRAP, 15 µM), adenosine diphosphate (ADP, 20 µM), and the combination of collagen-related peptide (2.5 µg/ml) + ADP (5 µM) + TRAP (15 µM) (CAT). VerifyNow® IIb/IIIa and vasodilator-stimulated phosphoprotein (VASP) phosphorylation assays were performed, and platelet PAR-1 expression, plasma platelet/endothelial and inflammatory biomarkers were determined before and during treatment. LTA responses to TRAP and CAT and VerifyNow results were markedly inhibited by vorapaxar. Maximal LTA response to TRAP (median, interquartile range) 2 hours post loading dose: placebo 68% (53-75%) and vorapaxar 3% (2-6%), p<0.0001. ADP inhibition was greater in the vorapaxar group at 4 hours and one month (p<0.01). In contrast to the placebo group, PAR-1 receptor number in the vorapaxar group at one month was significantly lower than the baseline (179 vs 225; p=0.004). There were significant changes in selected biomarker levels between the two treatment groups. In conclusion, vorapaxar caused a potent inhibition of PAR-1-mediated platelet aggregation. Further studies are needed to explore vorapaxar effect on P2Y12 inhibition, PAR-1 expression and biomarkers and its contribution to clinical outcomes.


Assuntos
Síndrome Coronariana Aguda/tratamento farmacológico , Plaquetas/efeitos dos fármacos , Lactonas/administração & dosagem , Piridinas/administração & dosagem , Síndrome Coronariana Aguda/sangue , Difosfato de Adenosina/metabolismo , Idoso , Aspirina/administração & dosagem , Aspirina/efeitos adversos , Biomarcadores/sangue , Plaquetas/fisiologia , Células Cultivadas , Europa (Continente) , Feminino , Seguimentos , Humanos , Mediadores da Inflamação/sangue , Lactonas/efeitos adversos , Masculino , Pessoa de Meia-Idade , América do Norte , Agregação Plaquetária/efeitos dos fármacos , Piridinas/efeitos adversos , Receptor PAR-1/antagonistas & inibidores , Receptores de Trombina/metabolismo
17.
Glob Heart ; 9(2): 197-202, 2014 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25667089

RESUMO

BACKGROUND: Although atherosclerosis is usually thought of as a disease of modernity, the Horus Team has previously reported atherosclerotic vascular calcifications on computed tomographic (CT) scans in ancient Egyptians. OBJECTIVES: The purpose of this study was to compare patterns and demographic characteristics of this disease among Egyptians from ancient and modern eras. METHODS: We compared the presence and extent of vascular calcifications from whole-body CT scans performed on 178 modern Egyptians from Cairo undergoing positron emission tomography (PET)/CT for cancer staging to CT scans of 76 Egyptian mummies (3100 bce to 364 ce). RESULTS: The mean age of the modern Egyptian group was 52.3 ± 15 years (range 14 to 84) versus estimated age at death of ancient Egyptian mummies 36.5 ± 13 years (range 4 to 60); p < 0.0001. Vascular calcification was detected in 108 of 178 (60.7%) of modern patients versus 26 of 76 (38.2%) of mummies, p < 0.001. Vascular calcifications on CT strongly correlated to age in both groups. In addition, the severity of disease by number of involved arterial beds also correlated to age, and there was a very similar pattern between the 2 groups. Calcifications in both modern and ancient Egyptians were seen peripherally in aortoiliac beds almost a decade earlier than in event-related beds (coronary and carotid). CONCLUSIONS: The presence and severity of atherosclerotic vascular disease correlates strongly to age in both ancient and modern Egyptians. There is a striking correlation in the distribution of the number of vascular beds involved. Atherosclerotic calcifications are seen in the aortoiliac beds almost a decade earlier than in the coronary and carotid beds.


Assuntos
Aterosclerose/diagnóstico por imagem , Múmias/diagnóstico por imagem , Tomografia por Emissão de Pósitrons , Tomografia Computadorizada por Raios X , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Egito , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem
19.
J Nucl Cardiol ; 20(6): 1076-85, 2013 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-24132816

RESUMO

BACKGROUND: Patients with LBBB or ventricular pacemaker undergoing MPI are at risk for false positive MPI results in the setting of an elevated heart rate (HR) with exercise or dobutamine stress. The areas of increased apparent ischemia are typically the LAD and septal territories. METHODS: In a subanalysis of the ADVANCE MPI 1 and 2 studies, perfusion on an initial adenosine and a second MPI study with regadenoson or adenosine was compared by visual and quantitative analysis. Among 2,015 patients, 64 had LBBB and 93 had pacemakers. The hemodynamic response during the second scan was compared in those with and without LBBB and PM. RESULTS: Following regadenoson, peak HR in the LBBB group increased by a mean of 25.4 compared to 15.3 bpm following adenosine (P = .0083). In the pacemaker group HR was blunted, 11.8 and 8.1 following regadenoson and adenosine, respectively (P = .1262). However, the visually assessed summed difference score and the quantitatively assessed extent of ischemia for the LAD and septal territories and the entire LV did not differ between the initial adenosine and subsequent regadenoson scans. CONCLUSIONS: The significant increase in HR observed with regadenoson compared to adenosine did not translate into greater perfusion defects in the LAD or septal territories in patients undergoing regadenoson stress.


Assuntos
Bloqueio de Ramo/diagnóstico por imagem , Teste de Esforço , Imagem de Perfusão do Miocárdio/métodos , Marca-Passo Artificial , Purinas , Pirazóis , Adenosina , Pressão Sanguínea/efeitos dos fármacos , Frequência Cardíaca/efeitos dos fármacos , Humanos , Purinas/efeitos adversos , Pirazóis/efeitos adversos
20.
J Am Coll Cardiol ; 62(23): 2178-84, 2013 Dec 10.
Artigo em Inglês | MEDLINE | ID: mdl-24013058

RESUMO

OBJECTIVES: This study sought to examine the efficacy and safety of mipomersen for reducing atherogenic lipids and lipoproteins in patients with hypercholesterolemia. BACKGROUND: Many patients on lipid-lowering therapies remain unable to achieve target low-density lipoprotein (LDL) cholesterol levels. Mipomersen, an antisense oligonucleotide inhibitor of apolipoprotein B, reduces LDL cholesterol and atherogenic lipoproteins. METHODS: This randomized, double-blind, multicenter study enrolled 158 patients with baseline LDL cholesterol levels ≥100 mg/dl with, or at high risk for, coronary heart disease who were receiving maximally tolerated lipid-lowering therapy. Patients received weekly subcutaneous mipomersen 200 mg (n = 105) or placebo (n = 52) for 26 weeks, with a 24-week follow-up period. Randomization was stratified by type 2 diabetes status. RESULTS: Sixty mipomersen and 44 placebo patients completed treatment. Mean baseline LDL cholesterol levels were 122.7 and 122.6 mg/dl in the placebo and mipomersen patients, respectively. Mipomersen reduced LDL cholesterol by -36.9% compared with placebo at -4.5% (p < 0.001). Target LDL cholesterol <100 mg/dl was attained in 76% of mipomersen and 38% of placebo patients. Mipomersen also significantly reduced apolipoprotein B (-38%) and lipoprotein(a) (-24%) (p < 0.001). Common adverse events included injection site reactions (78% with mipomersen, 31% with placebo) and flu-like symptoms (34% with mipomersen, 21% with placebo). Elevations in transaminases and liver fat also occurred in some patients, and these levels returned toward baseline after treatment cessation. CONCLUSIONS: Mipomersen significantly reduced LDL cholesterol, apolipoprotein B, and lipoprotein(a) in patients with hypercholesterolemia with, or at risk for, coronary heart disease not controlled by existing therapies. (Safety and Efficacy of Mipomersen [ISIS 301012] as Add-On Therapy in High Risk Hypercholesterolemic Patients; NCT00770146).


Assuntos
Anticolesterolemiantes/uso terapêutico , Apolipoproteínas B/antagonistas & inibidores , Aterosclerose/prevenção & controle , Doenças Cardiovasculares/prevenção & controle , LDL-Colesterol/sangue , Hipercolesterolemia/tratamento farmacológico , Oligonucleotídeos/uso terapêutico , Adulto , Idoso , Anticolesterolemiantes/administração & dosagem , Anticolesterolemiantes/farmacologia , LDL-Colesterol/efeitos dos fármacos , Método Duplo-Cego , Esquema de Medicação , Feminino , Humanos , Hipercolesterolemia/sangue , Hiperlipoproteinemia Tipo II/tratamento farmacológico , Masculino , Pessoa de Meia-Idade , Oligonucleotídeos/administração & dosagem , Oligonucleotídeos/farmacologia , Medição de Risco , Fatores de Risco , Resultado do Tratamento
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